method and apparatus for control channel transmission and reception

专利摘要:
abstract method and apparatus for transmitting and receiving the control channel a communication system in which user equipment (eu) is provided receives control information from a wireless network. the eu monitors control channel candidates using common reference signals (crs) and monitors improved control channel candidates using demodulation reference signals (dmrs) when the eu is configured in a first transmission mode, such as the transmission mode 9, to receive a downlink shared traffic channel based on dmrs. the eu monitors control channel candidates only using crs when the eu is configured in a second transmission mode, such as any of the transmission modes 1-6, to receive a downlink shared traffic channel based on crs. the eu then receives downlink control (dci) information in a subframe in one of the monitored control channel candidates or improved control channel candidates in the subframe.
公开号:BR112014003570A2
申请号:R112014003570
申请日:2012-08-14
公开日:2018-08-14
发明作者:Nimbalker Ajit；Kamal Sayana Krishna；Nory Ravikiran；T Love Robert；H Krishnamurthy Sandeep；Nangia Vijay；Zhuang Xiangyang
申请人:Motorola Mobility Llc；
IPC主号:

专利说明:

(54) Title: METHOD AND APPARATUS FOR TRANSMISSION AND RECEPTION OF CONTROL CHANNEL (51) Int. Cl .: H04L 1/00 (30) Unionist Priority: 08/08/2012 US
13 / 569,646, 08/08/2012 US 13/569, 64615/08/2011 US 61 / 523,568 (73) Holder (s): MOTOROLA MOBILITY LLC (72) Inventor (s): VIJAY NANGIA; RAVIKIRAN NORY; AJIT NIMBALKER; KRISHNA KAMAL SAYANA; SANDEEP H. KRISHNAMURTHY; ROBERT T. LOVE; XIANGYANG ZHUANG (85) National Phase Start Date: 14/02/2014 (74) Attorney (s): FLÁVIA SALIM LOPES (86) International Application: PCT US2012050700 of 14/08/2012 (87) International Publication: WO
2013/025677 of 02/21/2013 (57) Summary: SUMMARY METHOD Ε CONTROL CHANNEL TRANSMISSION AND RECEPTION APPARATUS A communication system in which user equipment (EU) is provided receives control information from a network wireless. The UE monitors control channel candidates using common reference signals (CRS) and monitors improved control channel candidates using demodulation reference signals (DMRs) when the UE is configured in a first transmission mode, such as the transmission mode 9, to receive a downstream shared traffic channel based on DMRS. The UE monitors control channel candidates using CRS only when the UE is configured in a second transmission mode, such as any of the 1-6 transmission modes, to receive a CRS-based downlink shared traffic channel. The UE then receives downlink control (DCI) information in a subframe in one of the monitored control channel candidates or improved control channel candidates in the subframe.
1/48
METHOD AND APPLIANCE FOR TRANSMISSION AND RECEPTION OF
CONTROL
RELATED APPLICATIONS [001] This application claims priority for United States Patent Application No. 61 / 523,568 filed on August 15, 2011.
CROSS REFERENCE FOR RELATED APPLICATIONS [002] This application is related to US Patent Application Serial No. 13 / 569,606, METHOD AND APPARATUS FOR TRANSMISSION AND RECEPTION OF THE CONTROL CHANNEL, and filed on the same date as this application.
FIELD OF THE INVENTION [003] The present description relates generally to wireless communication systems, and, more particularly, to transmission and reception of the control channel in an Orthogonal Frequency Division Multiplexing (OFDM) communication system.
BACKGROUND OF THE INVENTION [004] In current 3GPP LTE communication systems (Long Term Evolution of Third Generation Partnership Project), that is, Version 8, 9, and 10, downlink control (DL) signaling from an eNodeB is received by a user device (UE) in the first, first two, or first three, or first four symbols of a subframe later referred to as control symbols. The remaining symbols in the subframe, following the control symbols, are normally used to receive user data. For example, Figure 1 represents an exemplary subframe structure of the prior art with three control symbols. Signaling
2/48 control is transmitted over a full carrier bandwidth (eg 10 mega-hertz (MHz)) from the first three symbols in the subframe and is received by the UE over a Physical Downlink Control Channel (PDCCH) . User data is received by the UE on a Physical Downlink Shared Channel (PDSCH), and on selected Resource Blocks (RBs) of the PDSCH occupying either the full carrier bandwidth or a part of it.
[005] In order to decode the information sent in the PDCCH, the UE must perform channel estimation for coherent demodulation of the PDCCH. To perform channel estimation, the UE receives Reference Signals (RSs), for example, pilot symbols, which are cell-specific reference signals (CRS) and included in the subframe and which are associated with one or more antenna ports. For example, in 3GPP LTE Version 8, 9, and 10, the UE uses the CRSs associated with one or more antenna ports 0, 1, 2, and 3, to receive the PDCCH. The CRS structure for antenna ports 0, 1, 2 and 3 is shown in Figure 1, where RSs labeled R0 are resource elements carrying RSs associated with antenna port 0, RSs labeled RI are resource elements carrying RSs associated with port antenna 1, RSs labeled R2 are resource elements carrying RSs associated with antenna port 2 and RSs labeled R3 are resource elements carrying RSs associated with antenna port 3. An antenna port is defined in such a way that a channel on which a symbol on the antenna port is transmitted can be inferred from the channel through which a symbol on the same antenna port is transmitted.
3/48
Other signals and channels such as synchronization signals such as Primary / Secondary synchronization channels (P / S-SCH), broadcast control channels, including primary broadcast control channel (PBCH), etc. can also be present in a subframe. Typically, a master information block (MIB) is sent on the Physical Broadcast Channel (PBCH), the MIB comprises a portion of a system frame number (SFN), downlink system bandwidth and ARQ Channel configuration. Physical Hybrid (PHICH) (such as duration and PHICH resource indicator). In LTE Version-8, the PBCH is sent in subframe 0 (each subframe comprising two slots, each slot corresponding to a 0.5 millisecond) of a radio frame. Synchronization signals are transmitted within the six indoor PRBs or 72 indoor subcarriers (approximately 1.1 MHz) of the carrier bandwidth in subframes 0 and 5 of the radio frame. The exact location of the Synchronization signals changes based on the duplex type and Cyclic Prefix length.
[006] For 3GPP LTE Version 10, in order to demodulate user data (sent in PDSCH), the UE can use the RSs associated with antenna ports 0, 1, 2 and 3, or it can use RSs associated with other ports antenna, such as antenna ports 7, 8, 9, 10, 11, 12, 13, and 14, that is, the UE can use the RSs associated with all or a subset of these antenna ports, based on the transmission scheme used for PDSCH reception (instead, the transmission scheme depends on the configuration signaling from a serving eNodeB). The RSs associated with antenna ports 7, 8, 9, 10, 11, 12, 13 and 14 are generally
4/48 referred to as EU-specific reference signals (UERSs) or Demodulation Reference Signs (DMRSs) or dedicated reference signals (DRS). The RSs associated with antenna ports 0, 1, 2 and 3 are generally referred to as common reference symbols (CRSs). In CRS-based transmission schemes, the UE may use one or more antenna ports 0, 1, 2, 3 and for DMRS-based transmission schemes, the UE may use one or more of the antenna ports 7, 8, 9, 10, 11, 12, 13, 14. The actual number of spatial transmission layers and the associated antenna ports when using DMRS to decode PDSCH can be determined by the UE based on downlink control channel information (DCI) associated with PDSCH. Typically, both CRS and DMRS are not simultaneously used to demodulate data in PDSCH. While CRSs are sent across the full carrier bandwidth by eNodB, DMRSs can only be present in those RBs for which the UE has a PDSCH assignment. Therefore, when receiving PDSCH using DMRS, the UE can only use the DMRS present in those RBs for which it has a PDSCH assignment.
[007] For 3GPP LTE Version 11 (the next generation LTE system), it is expected that new DL control signaling will be sent by the eNodeB to the UE in symbols that reach a first time slot of the subframe or in symbols that reach both the first and second time slots of the subframe. The new DL control signaling is generally referred to as PDCCH-Enhanced (EPDCCH). Unlike PDCCH, which is transmitted over the entire channel bandwidth, a UE must receive EPDCCH in
5/48 a set of RBs that can reach only a portion of the carrier bandwidth in the frequency domain.
In addition, unlike PDCCH, which is received by the UE using CRS, it is anticipated that the EPDCCH can be received by the UE using DMRS [008] The new DL control signaling, that is, the EPDCCH, is expected to be used to complement the downlink control channels, that is, the PDCCH, of the existing 3GPP LTE Version 8/9/10 to support Advanced Long Term Evolution (LTE-A) Version 11+ features such as CoMP Multi-Point Coordination) and improved Multi-Input Techniques (MIMO), including Multi-User MIMO (MU-MIMO). EPDCCH can enable advanced control channel transmission schemes such as beam-formed selective frequency control transmission, control transmission dedicated to a user through the use of DMRS, spatially multiplexed control channel transmission to a single MIMO user (SUMIMO ) and MU-MIMO control transmission.
[009] To receive EPDCCH, the UE has to perform blind decoding for several EPDCCH candidates, ie EPDCCH signals that are eventually destined for the UE. In 3GPP LTE Version 10, in order to receive the PDCCH, the UE performs a maximum of 44 (60, if configured for uplink MIMO (UL)) blind decodings for the primary cell in each non-DRX sub-frame (discontinuous reception) . If the UE is configured for carrier aggregation (CA), the UE performs 32 additional blind decodings for each configured and activated secondary cell. In order to also
6/48 receiving the EPDCCH, the number of blind decodings that the UE has to perform increases significantly, imposing a significant time and weight of processing load on the UE.
[010] Therefore, there is a need for mechanisms to ensure that the complexity of blind decoding in the UE to receive both a PDCCH and an EPDCCH is maintained at a reasonable level.
BRIEF DESCRIPTION OF THE DRAWINGS [011] Figure 1 is a time-frequency diagram of an exemplary subframe structure of the prior art.
[012] Figure 2 is a time-frequency diagram of an exemplary OFDM subframe structure.
[013] Figure 3 it is a . block diagram on one system communication without thread according an modality gives present invention. [014] The Figure 4 is a diagram in blocks in one
user equipment of the communication system of Figure 3, according to an embodiment of the present invention.
[015] Figure 5 is a block diagram of a base station of the communication system of Figure 3, according to an embodiment of the present invention.
[016] Figure 6 is a time-frequency diagram of an exemplary OFDM subframe structure employed by the communication system of Figure 3 and illustrating reference signal positioning within a subframe according to an embodiment of the present invention.
[017] Figure 7 are block diagrams of exemplary subframe structures that illustrate two approaches to signaling a Link Control Channel
7/48
Enhanced Physical Descendant (EPDCCH) for the user equipment of Figure 3 according to various embodiments of the present invention.
[018] Figure 8 is a logical flowchart illustrating blind decoding performed by the user equipment of Figure 3 in order to decode control information sent to one or more of a Downlink Control Channel (PDCCH) and a PDCCH (EPDCCH Enhanced) according to various embodiments of the present invention.
[019] Figure 9 is a table describing a number of resource elements available per resource block for EPDCCH according to various modalities of the present invention.
[020] Figure 10 is another logical flowchart illustrating blind decoding performed by the user equipment of Figure 3 in order to decode control information sent to one or more of a Downlink Control Channel (PDCCH) and a PDCCH (EPDCCH Enhanced) according to various embodiments of the present invention.
[021] Skilled craftsmen will appreciate that elements of the figures are illustrated by simplicity and clarity and are not necessarily to scale. For example, the dimensions and / or the relative positioning of some of the elements of the figures can be exaggerated in relation to other elements to help improve the understanding of various modalities of the present invention. In addition, the common but well understood elements that are useful or necessary for a commercially viable modality are often not represented, in order to facilitate a less obstructed perspective of these various modalities
8/48 of the present invention. It will also be appreciated that certain actions and / or steps can be described or represented in a certain order of occurrence, while those skilled in the art will understand that this specificity in relation to the sequence is not really necessary. Those skilled in the art will further recognize that references to specific implementation modalities, such as circuits, can also be made by substituting with the execution of software instructions in general either on general purpose computing devices (eg, CPU) or a specialized processing device (for example, DSP). It will also be understood that the terms and expressions used herein have the ordinary technical meaning that is given to those terms and expressions by persons skilled in the technical field as defined above, except where different specific meanings have been otherwise established herein.
DETAILED DESCRIPTION OF THE INVENTION [022] In order to meet the need for mechanisms that ensure that the decoding complexity blinds on user equipment (UE) to receive both a Physical Downlink Control Channel (PDCCH) and a PDCCH (EPDCCH) Improved) is maintained at a reasonable level, a communication system is provided in which a UE receives control information from a wireless network. The UE monitors control channel candidates using common reference signals (CRS) and monitors improved control channel candidates using Demodulation Reference Signals (DMRs) when the UE is configured in a first transmission mode, such as the transmission mode 9, to
9/48 receive a downlink shared traffic channel based on DMRS. The UE monitors control channel candidates using only CRS when the UE is configured in a second transmission mode, such as any of the 1-6 transmission modes, to receive a CRS-based downlink shared traffic channel. The UE then receives downlink control (DCI) information in a subframe in one of the monitored control channel candidates or improved control channel candidates in the subframe.
[023] In other embodiments of the present invention, the UE can determine whether improved control channel candidates using Demodulation Reference Signals (DMRs) are monitored in a subframe, monitor, in the subframe, a set of control channel candidates using common reference signals (CRS), and receive, in the subframe, downlink control information (DCI) in a control channel candidate within the control channel candidate set, in which the control channel candidate set it is based on whether improved control channel candidates using Demodulation Reference Signals (DMRs) are monitored in the subframe. In yet other embodiments of the present invention, the UE monitors improved control channel candidates in a first set of aggregation levels in a first subframe, monitors improved control channel candidates in a second set of aggregation levels in a second subframe, where the second set of aggregation levels is different from the first set of aggregation levels, determines the first
10/48 set of aggregation levels and second set of aggregation levels based on one or more of a subframe type of subframes, a channel state information reference (CSI) signal configuration in the subframes, and a value Physical Control Format Indicator Channel (PCFICH) signaled in the subframes, and receives control information in at least one of the monitored improved control channel candidates.
[024] Generally, one embodiment of the present invention encompasses a method in a UE for receiving control information. The method includes monitoring control channel candidates using common reference signals (CRS) and monitoring improved control channel candidates using Demodulation Reference Signals (DMRs) when the UE is configured in a first transmission mode to receive a channel DMRS-based downlink shared traffic, monitor control channel candidates only using CRS when the UE is configured in a second transmission mode to receive a CRS-based downlink shared traffic channel, and receive information from downlink control (DCI) in a subframe in one of the monitored control channel candidates or improved control channel candidates in the subframe.
[025] Another embodiment of the present invention encompasses a method in a UE for receiving control information. The method includes receiving a subframe, determining whether improved control channel candidates using DMRS are monitored in the subframe, monitoring, in the subframe, a set of control channel candidates using CRS, and
11/48 receive, in the subframe, DCI on a control channel candidate within the control channel candidate set, where the control channel candidate set is based on whether improved control channel candidates using DMRS are monitored in the subframe.
[026] Yet another embodiment of the present invention encompasses a method in a UE for receiving control information. The method includes monitoring previous control channel candidates using CRS, monitoring improved control channel candidates in a first set of aggregation levels in a first subframe, monitoring improved control channel candidates in a second set of aggregation levels in a second subframe, where the second set of aggregation levels is different from the first set of aggregation levels, determine the first set of aggregation levels and the second set of aggregation levels based on one or more of a subframe type of the subframes , a channel state information reference signal (CSI) setting in the subframes, and a Physical Control Format Indicator (PCFICH) value signaled in the subframes, and receiving control information in at least one of the improved control channels monitored.
[027] In yet another embodiment of the present invention encompasses a method in a UE for receiving control information. The method includes monitoring a set of control channel candidates in a subframe, the set of control channel candidates comprising one or more types of control channel candidates, the types of control channel candidates including
12/48 control channel based on common reference signals (CRS), and candidate control channel based on Demodulation Reference Signals (DMRs); determining a set of control channel candidates based on CRS in the monitored set of control channel candidates based on a number of types of monitored control channel candidates; and receiving downlink control information (DCI) on a control channel candidate within the monitored set of control channel candidates including the determined set of control channel candidates based on CRS in the subframe.
[028] Yet another embodiment of the present invention encompasses a UE capable of receiving control information. The UE includes a wireless transceiver and a signal processing unit coupled to the transceiver, where the signal processing unit is configured to monitor control channel candidates using CRS and monitor improved control channel candidates using DMRSs when the UE is configured in first transmission mode to receive a downstream shared traffic channel based on DMRS, to monitor control channel candidates using only CRSs when the UE is configured in a second transmission mode to receive a shared traffic channel from downlink based on CRSs, and receive DCI in a subframe in one of the monitored control channel candidates or improved control channel candidates in the subframe.
[029] Yet another embodiment of the present invention
13/48 covers an UE capable of receiving control information. The UE includes a wireless transceiver and a signal processing unit coupled to the transceiver, in which the signal processing unit is configured to receive a subframe, determine whether improved control channel candidates using DMRS are monitored in the subframe, monitor, in the subframe, a set of control channel candidates using CRS, and receiving, in the subframe, DCI in a control channel candidate within the control channel candidate set, where the control channel candidate set is with based on whether improved control channel candidates using DMRS are monitored in the subframe.
[030] Yet another embodiment of the present invention encompasses a UE capable of receiving control information. The UE includes a wireless transceiver and a signal processing unit coupled to the transceiver, where the signal processing unit is configured to monitor previous control channel candidates using CRS, monitor improved control channel candidates in a first set aggregation levels in a first subframe, monitor improved control channel candidates in a second set of aggregation levels in a second subframe, where the second
set in levels in aggregation is different of the first set in levels in aggregation, to determine the first set in levels in aggregation and second set of levels of aggregation with base on a or more than a type of
subframes subframe, a CSI reference signal setting in the subframes, and a PCFICH value
14/48 signaled on the subframes, and receive control information on at least one of the monitored improved control channel candidates.
[031] The present invention can be more fully described with reference to Figures 2-10. Figure 2 illustrates an exemplary subframe structure in which the UE must receive EPDCCH and PDSCH. As shown in Figure 2, the EPDCCH can be sent to the UE in resource block 0 (RB0) and the PDSCH can be sent to the UE in resource blocks 2 and 3 (RB2 and RB3). Resource block 1 (RB1) is described as empty in Figure 2, but RB1 can also be used to send the PDSCH or EPDCCH to the UE. Figure 3 is a block diagram of a wireless communication system 300 according to an embodiment of the present invention. Communication system 300 includes user equipment (UE) 302, such as, but not limited to, a cell phone, radio phone, or a personal digital assistant (PDA), personal computer, laptop, or tablet computer with radio frequency (RF). Communication system 300 further includes an access network comprising a base station (BS) 310, such as a B node, an eNodeB, an access point (AP), a relay node (RN), a Domestic Bode, a Domestic eNode B, Macro eNodeB (MeNB), donor eNode (DeNB), femtocell, femto-node, picocell, network node or Base Transceiver Station (BTS) (the terms BS, eNóB, eNB and NodeB are used interchangeably here ) or by other terminology used in the art, which includes a set of antennas comprising multiple antennas and which supports Multiple Inputs Multiple Outputs (MIMO), BS 310 provides services
15/48 of communication, through a corresponding aerial interface 312, to the users' equipment, such as UE 102, residing in a coverage area, such as a cell or a sector of a cell, served by the BS. BS 310 can also each be referred to as a transmission point (TP) with a number of antennas. BS can comprise one or more transmitters and one or more receivers serving the UEs. UEs can also comprise one or more transmitters and one or more receivers.
[032] Aerial interface 312 comprises a downlink and an uplink. Each of the downlink and uplink link comprises several physical communication channels, including multiple control / signaling channels, such as a Downlink Physical Control Channel (PDCCH) and a Downlink Enhanced PDCCH (EPDCCH), and several communication channels. traffic, such as a downlink shared traffic channel, for example, a Physical Downlink Shared Channel (PDSCH).
[033] Referring now to Figures 4 and 5, block diagrams are provided from UE 302 and BS 310 according to various embodiments of the present invention. Each of UE 302 and BS 310 includes a respective signal processing unit 402, 502, such as one or more microsignal processing units, microcontrollers, digital signal processing units (DSPs), or combinations thereof or such other devices known to those of ordinary skill in the art. The specific operations / functions of signal processing units 402 and 502, respectively, and thus of UE 302 and BS 310,
16/48 are determined by an execution of software instructions and routines that are stored in a respective at least one memory device 404, 504 associated with the signal processing unit, such as random access memory (RAM), memory dynamic random access
(DRAM), and / OR memory only in read (ROM) or their equivalent, which store data and the programs what can be executed by the unit processing in signal corresponding.[034] Each one of UE 3 02 and BS 310 includes still one respective one or more transceivers wireless 406, 50 6 that are coupled to signal processing unit 402 , 502
from the UE or BS and that exchange wireless signals between the UE and BS through the air interface 312, such as PDCCH, EPDCCH, and the PDSCH. UE 302 also includes multiple 408 antennas and supports MIMO communications. BS 310 also includes a set of antennas 510, comprising multiple antennas 512. By using a set of antennas to transmit signals to a UE located in a BS coverage area, such as a cell or sector served by the set of antennas , BS is able to use MIMO techniques for signal transmission.
[035] In a conventional sense, the term antenna port has typically been used to refer to a physical antenna port in BS 310. A reference signal is generally associated with (ie, transmitted from) a port antenna, which allows a UE, such as UE 302, to take measurements on this antenna port, and thus estimate a channel from the corresponding antenna port for EU receivers. In 3GPP specifications, the definition
17/48 antenna port has an expanded range to deal with some new concepts. An antenna port is defined in such a way that a channel on which a symbol on the antenna port is transmitted can be inferred from the channel through which a symbol on the same antenna port is transmitted. An antenna port could match any well-defined description of a transmission from one or more of the antennas. As an example, it may include a beam-formed transmission from an antenna array with antenna weights being applied, where the antenna array itself may be unknown to the UE. In this case, the effective channel can be learned from a dedicated reference signal (DRS) sent from an associated antenna port. The dedicated reference signal can be formed from a similar beam for transmitting beam-formed data with the same antenna weights being applied to the antenna array. Typically, a reference signal is associated with an antenna port for the purpose of measurement or channel estimation or determination in the UE.
[036] BS 310 also includes a weight 508 in association with transceiver 506, such as a pre-decoder or any other type of signal weight, which is in communication with the signal processing unit 502 and which interposes between the set of antennas 510 and transceiver 506. In another embodiment of the present invention, weight 508 can be implemented by signal processing unit 502. Weight 508 weighs signals applied to multiple antennas 512 of antenna array 510 based on channel status information ( CSI)
18/48 returned by a UE, such as UE 302, for example, codebook report such as a codebook table and a ranking index, statistic report such as a covariance matrix or any other type of matrix , eigenvectors, or channel quality mean and variance, received signal quality information, a channel frequency response, or any other type of channel report known in the art, in order to preform and beam the signals for transmission to the UE through the downlink of the intervening air interface.
[037] When weight 508 comprises a pre-decoder, each UE 302 and BS 310 can still maintain, at least one memory device 404 and 504 and / or weight 508, a precoding matrix, this precoding matrix comprises several array sets and where each array set is associated with a combination of antennas for downlink transmission and with weights applicable to each antenna. Precoding matrices are well known in the art and will not be described in more detail. Based on the channel conditions measured by a UE, the UE reports a precoding metric, preferably a Precoding Matrix Indicator (PMI), for a group of resource elements (REs), where an ER is a time resource -frequency, such as 1 subcarrier in frequency per 1 OFDM symbol in time. When determining a precoding metric for a group of REs, the UE calculates a set of complex weights based on the measured channel conditions. The set of complex weights can be beam-forming eigenvectors
19/48 derived from downlink reference signal measurements. Complex weights are mapped to a set of vectors already defined, which, for a vector closer to the set of vectors already defined, to produce a precoding vector. The UE then transmits the index of the precoding vector selected by the UE using an uplink control channel.
[038] The modalities of the present invention are preferably implemented within UE 302 and BS 310, and, more particularly, with or in programs and software instructions stored on at least one memory device 404, 504 and executed by processing units signal 402, 502 of the UE and BS. However, one skilled in the art understands that the modalities of the present invention, alternatively, can be implemented in hardware, for example, integrated circuits (ICs), application-specific integrated circuits (ASIC), and the like, such as ASICs implemented in a or more of UE 302 and BS 310. Based on the present description, a person skilled in the art will be readily able to produce and implement such software and / or hardware without undoing experimentation.
[039] Communication system 300 comprises a Multiple Access modulation scheme by Orthogonal Frequency Division (OFDMA) for data transmission through the aerial interface 312, in which a frequency channel, or bandwidth, is divided into several blocks physical resource resources (PRBs) over a given period of time. Each physical resource block (PRB) comprises several orthogonal frequency subcarriers during a certain number of OFDM symbols, which are the
20/48 physical layer over which traffic and signaling channels are transmitted in a TDM or TDM / FDM manner. A communication session can be assigned a PRB or a group of PRBs for an exchange of carrier information, thus allowing multiple users to transmit simultaneously on different PRBs such that each user transmission is orthogonal to the transmissions of other users. The PRB can also be assigned to multiple users in which case the users are no longer orthogonal, but can be separated based on spatial signatures of the individual transmission weights.
[040] In addition, the communication system 300 preferably operates in accordance with the Advanced Long Term Evolution (LTE-A) standards of the Third Generation Partnership Project (3GPP), which specify standards for system operating protocols wireless telecommunications system including radio system parameters and call processing procedures, and implements coordinated multipoint transmission (CoMP). As such, PDCCH can be considered, and is also referred to here, as a previous control channel as PDCCH is a control channel used by previous 3GPP communication systems, and EPDCCH is an improved control channel, and it is also here referred to as such, created by the use in the 3GPP LTE-A communication systems proposed last. However, those who are experts in the art realize that communication system 100 can operate according to any wireless telecommunications standard that employs a Division Division Multiplexing modulation scheme
Orthogonal Frequency (OFDM), such as, but not limited to
21/48 other 3GPP communication systems employing channel estimation and channel quality reporting and received signal demodulation based on channel estimation, a 3GPP2 Evolution (Third Generation Partnership Project 2) communication system, for example, a 2000 1XEV-DV CDMA (Code Division Multiple Access) communication system, a wireless local area network (WLAN) communication system, as described by the IEEE 802.xx standards, for example, the 802 standards, lla / HiperLAN2, 802, llg, or 802.20, or Worldwide Interoperability Communication System for Microwave Access (WiMAX) that operates in accordance with the 802.16 IEEE (Institute of Electrical and Electronic Engineers) standards, including 802.16 and 802.16m .
[041] Among the signals being multiplexed and transmitted to UE 302 from BS 310 are pilot or reference signals that can be multiplexed with other control information and user data. Reference signals, and more particularly Common Reference Signals (CRS) and EU-specific reference signals (UERS) or Demodulation Reference Signals (DMRs) or dedicated reference signals (DRS), are sent via antennas from a BS serving, i.e. BS 310, for a served UE, i.e. UE 302, for the UE to demodulate received user data and to determine channel status information (CSI) that is returned to the serving BS. In addition, with respect to CoMP transmissions, the UE may need to determine CSI for multiple transmission points or multiple BSs as well.
[042] Referring now to Figure 6, a time-frequency diagram 600 is provided from a structure of
22/48 exemplary subframe that depicts exemplary distributions of reference signals, and particularly Common Reference Signs (CRS) and UE-specific reference signs (UERS) or Demodulation Reference Signs (DMRs), in an OFDMA 630 subframe that can be employed by the communication system 300 according to various embodiments of the present invention. A vertical scale of the 600 time-frequency diagram depicts several frequency blocks, or frequency boxes, (frequency subcarriers) of the subframe that can be allocated. A horizontal scale of the time-frequency diagram 600 depicts several time blocks (in units of OFDM symbols) 601-614 from the subframe that can be allocated. Subframe 630 comprises several resource blocks (RBS), such as Resource Block 0 (RB0), Resource Block 1 (RB1), Resource Block 2 (RB2) and Resource Block 3 (RB3), where each RB comprises 12 OFDM subcarriers during a time slot comprising seven (7) OFDM symbols. Typically, the subframe duration is Ims and consists of two duration slots of 0.5 ms each. In turn, each RB is divided into multiple resource elements (REs), where each RE is a single OFDM subcarrier, or frequency box, in a single OFDM symbol.
[043] For LTE Version 11, a UE such as UE 302 is provided to receive the EPDCCH on a set of RBs that can reach only a portion of the carrier bandwidth in the frequency domain. As depicted in sub-frame 630, UE 302 can expect to receive the EPDCCH and PDSCH, where the EPDCCH is sent to the UE in RB0 and the PDSCH is sent to the UE in RB2 and RB3. RB1 is described as empty
23/48 in Figure 6, but RB1 can also be used to send the
PDSCH or EPDCCH for the UE.
[044] In order to decode the information sent on the PDCCH, UE 302 needs to perform the channel estimate after receiving the PDCCH. To perform channel estimation, the UE receives Reference Signals (RSs) that are included in the subframe. RSs are associated with one or more antenna ports. For example, as shown in Figure 6, RSs labeled R0 are resource elements carrying reference signals associated with antenna port 0, RSs labeled RI are resource elements carrying reference signals associated with antenna port 1, RSs labeled R2 are elements resource (REs) carrying reference signals associated with antenna port 2, and RSs labeled R3 are resource elements (REs) carrying reference signals associated with antenna port 3. RSs associated with antenna ports 0, 1, 2 and 3 are generally referred to as Common Reference Signals (CRS). To demodulate user data (sent in PDSCH), 3GPP LTE Version 10 provides that a UE, such as the UE 302, can use the RSs associated with antenna ports 0, 1, 2 and 3 or can use RSs associated with other ports antenna ports, such as antenna ports 7, 8, 9, 10, 11, 12, 13 and 14, that is, the UE can use RSs associated with all or part of these antenna ports based on the transmission scheme used for reception PDSCH (in turn, the transmission scheme depends on the configuration signaling from the BS serving, that is, BS 310). The RSs associated with these other antenna ports 7, 8, 9, 10, 11, 12, 13 and 14 are commonly referred to as
24/48 EU-specific reference (UERS) or Signals of
Demodulation Reference (DMRS) or Reference Signs
Dedicated Services (DRS). Unlike PDCCH, which is received by the UE using CRS, the EPDCCH is received by the UE using DMRS.
[045] That is, as shown in Figure 6, REs labeled R0-R3 (and associated with antenna ports 0-3, respectively) are allocated to CRS (CRS REs) and REs labeled R7-R10 (and associated with antenna 7-10, respectively) are allocated to DMRS (DMRs REs). It should be understood that corresponding RSs for a group of antenna ports can be mapped to the set of available REs using any multiplexing method known in the art or a combination thereof, for example, or code division multiplexing (CDM) or multiplexing by frequency / time division where each individual antenna reference signal occupies a different RE. For example, RSs corresponding to antenna ports 7 and 8 are multiplexed using CDM and are mapped to the same REs in the time and frequency domain. Subframe 630 also includes other RSs that are distributed in the control regions and / or user data regions of the subframe. These other RSs may be present, but they are not necessarily used to demodulate the signals received by an UE in an LTE-A communication system. For example, the other RS may include the CSI-RS (Channel State Information reference signal) or mute RS where the UE must assume and reset transmission power in the RS REs, which can be useful for interference measurements, or it can include RS positioning that can be used
25/48 for detecting location information, etc.
[046] In addition, as shown in Figure 6, RSs corresponding to an antenna port can be allocated to a resource element (RE) pair in user data regions, and more particularly to one of the RE pairs associated with symbols OFDM 606-607, and 613-614. For example, as shown in Figure 6, pairs of adjacent DMRS RE labeled R7 / 8 may be allocated to antenna port 7 and antenna port 8, and adjacent pairs of DMRS RE labeled R9 / 10 may be allocated to the antenna port. antenna 9 and antenna port 10. In this example, the RS for R7 and R8 are multiplexed by code division with orthogonal Walsh codes. Likewise, RS for R9 and R10 are multiplexed by code division using orthogonal Walsh codes.
[047] UE 302 is expected to monitor EPDCCH in a set of RBs (EPDCCH RB set) that can cover only a portion of the carrier bandwidth in the frequency domain. In addition, the UE can monitor EPDDCH on only those time symbols in the subframe that are different from the time symbols corresponding to PDCCH. For example, in Figure 6, the UE can monitor PDCCH over the entire carrier bandwidth in the frequency domain and in 601,602 time symbols in the time domain (i.e., there are two control symbols in the example). You can monitor EPDCCH on one (for example, RB0) or more RBs in the frequency domain and 603-607 symbols or alternately,
symbols 603-614 in the domain of time. For example, considering RB0 in Figure 2, the HUH monitors EPDCCH in this portion from RB0 622 not is allocated for PDCCH.
26/48
Alternatively, RBO can be set to cover only non-PDCCH control region resources, that is, excluding the resources assigned to PDCCH. In an alternative mode, RBO can be set to start from a predetermined symbol and occupies the remaining symbols in the slot. The predetermined symbol can be signaled to the UE via PDCCH or upper layer signaling (for example, RRC or MAC signaling). To receive the EPDCCH, UE 302 must monitor several EPDCCH candidates. Monitoring involves trying to blindly decode one or more EPDCCH candidates (in this example blind decoding is attempted for each of the various EPDCCH candidates).
[048] Referring now to Figure 7, exemplary subframe structures that illustrate two approaches to signaling EPDCCH to a UE according to various embodiments of the present invention are shown. In a first approach of the two approaches, that is, Option 1, DL assignments signaled to UE 302 are restricted to a first time slot (time slot 0) and uplink guarantees (UL) are restricted to a second slot. time (time slot 1). In a second approach of the two approaches, that is, Option 2, both DL assignments and UL guarantees can be signaled for UE 302 either in the first time slot or the second time slot. In yet another option, DL assignments (or UL guarantees) can occupy both slots.
[049] To receive EPDCCH using any approach shown in Figure 7, UE 302 first needs to know a set of RBs in which the new control signaling is expected, that is, an EPDCCH RB set. However, in order to
27/48 To reduce the complexity of blind decoding in the UE, the communication system 300 provides for an EPDCCH RB set that is less than the maximum number of RBs that the UE needs to receive for a particular carrier bandwidth.
[050] Referring now to Figure 8, a logical flowchart 800 is provided that illustrates blind decoding performed by UE 302 in order to decode control information sent to one or more of the PDCCH and EPDCCH according to various modalities of the present invention . Logical flow 800 starts (802) when UE 302 monitors the downlink of air interface 312 to the PDCCH and EPDCCH. In particular, UE 302 monitors (804) the PDCCH, for example, time symbols from the PDCCH 620 region of subframe 630, for PDCCH decoding candidates using CRS. UE 302 also monitors (806) EPDCCH, e.g., EPDCCH 622 region of subframe 630, or more generally multiple RBs corresponding to EPDCCH in subframe 630 for EPDCCH decoding candidates using DMRS. In EPDCCH monitoring, UE 302 monitors a selection subset of RBs, that is, UE 302 monitors an EPDCCH RB set that is less than the maximum number of RBs that the UE can receive in the subframe for a given bandwidth setting transmission. In response to monitoring, and decoding (808), PDCCH and EPDCCH candidates, UE 302, then receives and decodes (810) downlink control (DCI) information on one or more of the monitored PPDCCH and EPDCCH based on Decoded RBs from PPDCCH and EPDCCH, respectively. Logical flowchart 800 then ends (812).
[051] Referring now to Figure 10, a flow chart
Logical 28/48 1000 is provided that illustrates receiving downlink control information (DCI) by UE 302 according to various embodiments of the present invention. Logical Flow 1000 starts (1002) when UE 302 monitors the downlink of air interface 312 for control channel candidates. In particular, UE 302 monitors (1004) control channel candidates using common reference signals (CRS) and monitors improved control channel candidates using Demodulation Reference Signals (DMRs) or UE Specific reference signals (UERS) when it is configured in a first transmission mode to receive a downstream shared traffic channel based on DMRS. Monitoring control channel candidates using CRS may further comprise monitoring Physical Downlink Control Channel (PDCCH) candidates. Monitoring improved control channel candidates using DMRS may further comprise monitoring improved Physical Downlink Control Channel (EPDCCH) candidates. The downlink shared traffic channel can be a Physical Downlink Shared Channel (PDSCH). The first transmission mode can be the LTE 9 transmission mode or any other transmission mode in which the UE receives PDSCH based on DMRS. The UE 302 monitors (1006) control channel candidates using only CRS when it is configured in a second transmission mode to receive a CRS-based downlink shared traffic channel. The second transmission mode can be an LTE transmission mode 1, 2, 3, 4, 5 or any other transmission mode in which the UE is expected to receive PDSCH using
29/48
CRS, but not DMRs. UE 302 receives (1008) downlink control (DCI) information in a subframe (such as subframe 630) in one of the monitored control channel candidates or improved control channel candidates in the subframe. Logical flowchart 1000 then ends (1010).
[052] For example, for a carrier bandwidth of 20MHz, a UE, such as UE 302, is typically expected to receive a maximum of 100 RBs. Within these RBs, a smaller set (for example, a set of 10 RBs) can be specified for UE 302 to monitor EPDCCH reception. In such an embodiment of the present invention, the EPDCCH RB set can be predetermined for each carrier bandwidth. For example, for a carrier bandwidth of 1.4MHz, all 6 RBs on the carrier can form the EPDCCH RB set, and for a carrier bandwidth of 20MHz, RBs RB0, RBI, RB20, RB21, RB40, RB41, RB98, RB99 can form the EPDCCH RB assembly.
[053] In another such embodiment of the present invention, several EPDCCH RB sets can be predetermined for each carrier bandwidth and BS 310 can signal UE 302 which EPDCCH RB set to use in a particular subframe or a specific set of subframes. In yet another example of an embodiment of the present invention, BS 310 can transmit a bitmap to UE 302 that identifies the EPDCCH RB set for all subframes. In yet another example of an embodiment of the present invention, BS 310 can signal multiple EPDCCH RB sets for EU 302 and also signals which RB set to use in a particular subframe or a particular set of
30/48 subframes. RBs within the EPDCCH RB set can be selected to be contiguous, that is, adjacent or non-contiguous frequency domain RBs. Contiguous RBs allow for early frequency selective transmission of EPDCCH, which is useful when BS 310 has exact frequency selective Channel Quality Information (CQI) from UE 302 and non-contiguous RBs allow for frequency-distributed EPDCCH transmission. In addition, BS 310 can configure different UEs with different EPDCCH RB sets.
[054] To receive the EPDCCH in a subframe, UE 302 is intended to monitor a set of EPDCCH candidates, that is, an EPDCCH candidate set, in the RBs comprising the EPDCCH RB set. Here, monitoring implies trying to decode each of the candidates in the EPDCCH candidate set in accordance with all Downlink Control Information (DCI) formats applicable for this candidate. Each EPDCCH candidate is associated with a control channel element (CCE) or a set of aggregated CCEs. As used herein, in the context of EPDCCH, these can be called enhanced control channel elements (eCCEs) to distinguish them from the CCE terminology used for PDCCH. Each enhanced control channel element (eCCE) comprises time-frequency resource elements (REs) within the RBs of the EPDCCH RB set.
[055] In order to illustrate the principles of the present invention and not intending to limit the invention in any way, it is assumed that the EPDCCH RB UE 302 set contains RBs RB0, RB1, ..., RBn (logical indexing is used here) . ECCEs
31/48 can then be defined as described in any of the following examples.
[056] In a first example, eCCE_0 comprises all REs in RBO, eCCE_l comprises all REs in RB1, ..., eCCE_n comprises all REs in RBn. In this example, the EPDCCH candidate set is equivalent to the EPDCCH RB set.
[057] In a second example, eCCE_0 comprises a first subset of REs in RBO, eCCE_l comprises a second subset of REs in RBO, eCCE_2 comprises a first subset of the set of REs in RB1, eCCE_3 comprises a second set of subsets of REs in RB1, ..., eCCE_2n-1 comprises a first subset of REs in RBn, and eCCE_2n comprises a second subset of REs in RBn.
[058] In a third example, and referring now to table 900 represented in Figure 9, an eCCE can be defined to comprise a minimum number of REs based on the type of subframe, for example, 36 REs for normal subframes and 40 REs for Multi-Diffusion-Diffusion Network (MBSFN) subframes for a Physical Control Format Indicator Channel (PCFICH) using two PDCCH control symbols (ie, PCFICH = 2) and two CRS ports. That is, table 900 describes a number of resource elements available per resource block for EPDCCH according to various embodiments of the present invention. With respect to a first time slot, the second column of the table has a number of PDCCH control symbols used. For example PCFICH = 3, covers the case of 3 symbols used
32/48 for the PDCCH control. The third and fourth columns of the table list the range of possible eCCE sizes for a normal subframe and using two CRS ports (column 3) and using four CRS ports (column 4), where the smaller end of each range is due to the use of signals channel status information reference (CSI RSs) and the long end of each interval is due to an absence of CSI RSs. The fifth and sixth columns of the table list the range of possible eCCE sizes for an MBSFN subframe, again using two or four CRS ports and where the lower end of each range is due to the use of CSI RSs and the larger end of each range is due to an absence of CSI RSs. CSI RS can include either zeroing CSI RS power (or mute RS) or regular CSI RS.
[059] Excess REs, that is, REs beyond the minimum CCE size, such as 12 REs (48-36) for normal subframes, PCFICH = 1, 2 CRS ports (minimum CCE size = 36) and, 12 REs ( 52-40) for MBSFN subframes, PCFICH = 1, two CRS ports (minimum CCE size = 40) or 20 REs 56-36 for normal subframes, PCFICH = 0, 2 CRS ports (minimum CCE size = 36) and 20 REs (60-40) for MBSFN subframes, PCFICH = 0, two CRS ports (minimum CCE size = 40), can be either:
i) considered as more DMRs REs (12/20), (more complex channel estimate), ii) considered as more eCCE REs (12/20), (more BDs if PCFICH not used and RRC configuration not used), iii) considered as more DMRS (8/8) and eCCE REs (4/12), (more balanced performance), or iv) considered as more DMRS for first (4/4) and
33/48 second (4/4) EPDCCH slot and more eCCE REs for first (0/8) and second (4/4) EPDCCH slots.
UE 302 can then attempt to use the excess REs based on the PCFICH detection or RRC configuration. To use excess REs as eCCE REs, the UE can assume that more eCCE REs correspond to subsequent soft circular buffer PDCCH DCI format content.
[060] In still other embodiments of the present invention, the set of EPDCCH candidates to be monitored by UE 302, that is, the candidate set EPDCCH, can also be defined in terms of research spaces. For example, an EPDCCH Sk ^(L) research space at L aggregation level refers to a set of EPDCCH candidates where each candidate in the research space has L aggregated eCCEs. For PDCCH, aggregations of L = 1, 2, 4, and 8 CCEs are supported. For EPDCCH, the same levels of aggregation can be supported. However, in another embodiment of the present invention, since the size of eCCEs can be different from the fixed CCE size of 36 REs, other levels of aggregation (for example, L = 3) can be used. In addition, since the size of eCCEs can change considerably between different subframes and slots within a subframe (for example, based on the PCFICH value, presence of CSI-RS, based on the type of subframe), a set of levels of aggregation that the UE assumes for EPDCCH monitoring can also vary between subframes or between slots in the same subframe or between different types of subframe (for example, a normal subframe against an MBSFN subframe). More generally, a set of aggregation levels that the UE assumes for EPDCCH monitoring can
34/48 vary between a first period of time and a second period of time.
[061] The number of REs available for EPDCCH in a RB, that is, REs not mapped to PDCCH or CRS or DMRS, is shown in table 900 represented in Figure 9. Normal cyclic prefix (CP) subframe structure is assumed for table 900. Each cell in table 900 shows two values, al-a2, where 'al' is the number of REs available if EPDCCH is mapped around possible zero power and regular CSIRS in a time slot, and 'a2' is the number of REs available if there is no CSI-RS in a time slot. Depending on the CSI-RS configuration the number of REs available for EPDCCH in an RB can take any between al and a2 including al and a2.
[062] For example, consider a drawing where each eCCE corresponds to all REs available in a RB and a case of Normal subframe - 2 CRS ports - PCFICH = 3 in table 900. For subframes where CSI-RS is not configured, UE 302 can monitor search spaces with aggregation levels 1, 2, 4 and 8 (ie 32, 64, 128 and 256 REs) in the first time slot and only monitor search spaces with aggregation levels 1, 2 and 4 (ie 64, 128, and 256 REs) in the second time slot. In subframes where full CSI-RS is
configured, the UE can to monitor spaces of research with aggregation levels of 2, 4 and 8 (or be , 48, 96, and 192 REs) in the first slot in time (an turn that 2 4 REs what
correspond to aggregation level 1 can be too small to fit DCI) and aggregation levels 1, 2, 4 and 8 (32, 64, 128 and 256 REs) in the second time slot.
[063] For PDCCH, only a modulation scheme for
35/48
Quadrature Phase Offset Switching (QPSK) is used for DCI transmission. For EPDCCH, since eCCEs are transmitted in different RBS, it may be possible to use a higher order modulation scheme for some EPDCCH candidates. Therefore, in addition to an aggregation level, search spaces and search space candidates for EPDCCH can also be defined based on the modulation used for EPDCCH transmission. For example, the UE can monitor one EPDCCH candidate with leCCE aggregation level and QPSK modulation and another EPDCCH candidate with leCCE aggregation level and 16QAM modulation (Quadrature Amplitude Modulation). In addition, all EPDCCH candidates monitored at the QPSK modulation level can comprise a research space at the QPSK modulation level and all EPDCCH candidates monitored at the 16QAM modulation level can comprise a research space at the 16QAM modulation level.
[064] As described above, PDCCH transmissions to the UE are based on CRS, while EPDCCH transmissions to the UE can be based on DMRS. EPDCCH transmission using DMRS allows spatial multiplexing of the DCI of two separate UEs in the same set of time-frequency resources, that is, the same eCCE. This transmission scheme is commonly referred to as multi-user MIMO (MU). To support MU-MIMO, BS 310 must use separate precoding weights for EPDCCH transmission for each UE and each such UE must determine the precoding weight used for its EPDCCH from the DMRS associated with the EPDCCH transmission. Therefore, with MU-MIMO, multiple EPDCCHs (each associated with a particular antenna port
36/48
DMRS), can be transmitted in a single eCCE. From an UE perspective, when MU-MIMO is used for EPDCCH transmission, several EPDCCH candidates, each candidate being associated with a DMRS antenna port, can be monitored by a UE in an eCCE or a set of aggregated eCCEs . Therefore, in addition to the level of aggregation and modulation order, search spaces and search space candidates for EPDCCH can also be defined based on the DMRS antenna port associated with EPDCCH transmission. For example, a UE, i.e. UE 302, can monitor an EPDCCH candidate with leCCE aggregation level, QPSK modulation and transmission based on DMRS 7 antenna port. The UE can also monitor another EPDCCH candidate with leCCE aggregation level, QPSK modulation and transmission based on DMRS 8 antenna port. In addition, all EPDCCH candidates monitored based on DMRS 7 based transmissions can comprise a research space associated with DMRS 7 port. Likewise, all candidates EPDCCH monitored based on transmissions based on DMRS 8 port can comprise a search space associated with DMRS 8 port.
[065] The EPDCCH candidates that EU 302 monitors can be divided into a set of common search space candidates (or improved common search space (eCSS) to differentiate with CSS for PDCCH), and a set of space search candidates. UE specific search (or enhanced EU specific search space (eUESS) to differentiate with UESS for PDCCH). ECSS candidates can be monitored in an EPDCCH RB suite that is broadcast to all UEs in the BS coverage area
37/48 serving, ie BS 310. For example, in LTE, this information can be broadcast in a Master Information block (MIB) or in a System Information block (SIB). EUESS candidates can be monitored in an EPDCCH RB suite that is signaled to the UE through UE-specific RRC signaling.
[066] In LIE, in order to receive the PDCCH, a UE, such as UE 302, monitors a set of PDCCH candidates. More specifically, the UE, ie UE 302, monitors a common search space (CSS) at each of the CCE aggregation levels 4 and 8 (4 PDCCH candidates at aggregation level 4, and two PDCCH candidates at the aggregation level 8). The DCI formats associated with PDCCH candidates in CSS have two different sizes. Therefore, UE 302 has to perform two blind decodings for each PDCCH candidate in the CSS. UE 302 also monitors a specific EU research space at each of the CCE aggregation levels 1, 2, 4, and 8 (6 candidates at aggregation level 1, 6 candidates at aggregation level 2, 2 candidates at aggregation level 4, 2 candidates at aggregation level 8). The DCI formats associated with PDCCH candidates in UESS have two different sizes if the UE is not configured for uplink MIMO and three different sizes if the UE is configured for uplink MIMO. Therefore, the UE has to perform either two or three blind decodings for each
candidate PDCCH at the UESS. In summary, in order in to monitor candidates PDCCH in CSS, the EU has to perform one maximum of '(4 + 2) * 2 = = 12 ' blind decodings (BDs), and to monitor candidates PDCCH in UESS, the UE has to execute a maximum of ou '(6 + 6 + 2 + 2) *2 = 32 ' BDs or '(6 + 6 + 2 + 2) * 3 = 48 'BDs.
38/48
Combining this, the UE must be able to run a maximum of '12 + 32 = 44 'BDs without UL-MIMO and '12 + 48 = 60' BDa with UL-MIMO. If the UE is configured for carrier aggregation (CA), the UE monitors an additional UESS at aggregation level 1, 2, 4, 8 for each configured and activated secondary cell and must be able to perform the additional blind decodings required for monitoring these additional research spaces.
[067] In LTE, in order to receive the PDSCH, a UE, such as UE 302, is configured with a transmission mode from among multiple known LTE transmission modes. For example, if the UE, that is, UE 302, is configured in transmission mode 2, the UE can receive the PDSCH using CRS and the transmission diversity transmission scheme. If UE 302 is configured with 3, 4, 5 or 6 transmission modes, the UE can receive PDSCH using CRS and MIMO-based transmission schemes such as open-loop spatial multiplexing, closed-loop spatial multiplexing and MU-MIMO. If UE 302 is configured with transmission modes 7 or 8, the UE can receive PDSCH using UE-specific RSs. If UE 302 is configured in transmission mode 9, the UE can receive PDSCH using DMRS and spatial multiplexing of up to eight layers is possible. Transmission mode 9 is suitable for PDSCH reception using advanced features like CoMP and additionally enhanced MIMO techniques including MU-MIMO. Configuring the UE in transmission mode 9 also allows for the selective frequency transmission formed from PDSCH beam to the UE. During initial network access, that is, before receiving transmission mode configuration signaling from BS 310, UE 302 can receive PDSCH using
39/48 or transmission mode 1 or transmission mode 2, which are the standard transmission modes of LTE.
[068] Since advanced transmission schemes such as frequency multilayer selective beam formation using DMRS can only be supported by the UE 302 when the UE is configured in transmission mode 9, the UE can monitor EPDCCH candidates only when it is configured for the transmission mode 9. More generally, since EPDCCH is used to improve control channel performance for certain improved transmission modes specific to receive PDSCH, UE 302 can monitor EPDCCH candidates only when it is configured in the enhanced transmission modes for receive PDSCH. When UE 302 is configured in the previous transmission modes, only the UE needs to monitor the PDCCH candidates and the UE can skip monitoring the set of EPDCCH candidates. For example, during initial access or, for subframes where UE 302 is configured in one of the transmission modes 1-8, the UE can monitor only PDCCH candidates. For subframes where UE 302 is configured in transmission mode 9, the UE can then monitor EPDCCH candidates.
[069] Alternatively, the base station can send a trigger to the UE to monitor both PDCCH and EPDCCH candidates. With this alternative, a UE, based on receiving the trigger, determines whether it should monitor PDCCH candidates only (using CRS) or, monitor both PDCCH candidates (using CRS) and EPDCCH (using DMRS). The trigger can be signaled to the UE using RRC signaling or Medium Access Control (MAC) layer signaling or through a bit (or bit sequence) in PDCCH. In
40/48 another alternative, the UE can be configured by the base station to monitor both PDCCH and EPDCCH candidates in a first subset of subframes within a frame and, monitor only PDCCH candidates in a second subset of subframes within the frame. A frame can be a radio frame that normally comprises several subframes. For example, 1 frame = 10 subframes. In yet another alternative, the UE can be configured by the base station to monitor only EPDCCH candidates in a first subset of subframes within a frame and monitor only PDCCH candidates in a second subset of subframes within the frame.
[070] In LTE Version 8, 9, and 10, a UE, such as UE 302, must support a maximum of 60 blind decoding operations for a serving cell, and all blind decoding operations are performed to monitor PDCCH. For LTE Version 11, when an UE, i.e. UE 302, monitors EPDCCH, the number of blind decodings that the UE performs must be shared between PDCCH and EPDCCH monitoring so that the total blind decoding complexity in the UE is not increased by compared to LTE Version 10 or is maintained at a level comparable to that of LTE Version 10.
[071] For example, when UE 302 is not configured in transmission mode 9, all blind decodings performed by the UE in a subframe can be used to monitor PDCCH. When UE 302 is configured in transmission mode 9, the UE monitors PDCCH (i.e., PDCCH control channel candidates) for a first set of DCI formats and monitors EPDCCH candidate set for a different set of DCI formats, thus dividing the
41/48 blind decoding operations between the PDCCH and EPDCCH. Alternatively, UE 302 can monitor PDCCH search spaces at a first set of aggregation levels (for example, aggregation levels 1, 2, 4 and 8) and can monitor EPDCCH search spaces at a different set of aggregation levels ( for example, aggregation levels 2 and 4 only). In addition, at each level of aggregation, the UE can monitor a different number of candidates for PDCCH and EPDCCH.
[072] In another example, in a subframe where UE 302 monitors the EPDCCH, the UE only monitors PDCCH candidates belonging to the CSS. In this example, UE 302 should perform 12 blind decodings for PDCCH and all other blind decodings, that is, 48 blind decodings assuming that a maximum number of blind decodings in a subframe is 60, can be used to monitor the EPDCCH. In yet another example, UE 302 can monitor PDCCH candidates for DCI formats by signaling downlink assignments and the UE can monitor EPDCCH candidates for DCI formats by signaling uplink assignments.
[073] Some examples based on combinations of the implicit blind decoding separation methods of the present invention discussed above are as follows. In a first example, UE 302 can monitor the PDCCH for DCI 0 / IA and 1C formats (6 candidates in CSS and 16 candidates in UESS) and monitor the EPDCCH for DCI 0 / IA and 2C formats (16 EPDCCH candidates). This results in '(4 + 2) * 2 + (6 + 6 + 2 + 2) * 1 = 28' blind decoding for the PDCCH and '(6 + 2 + 6 + 2) * 2 = 32' blind decoding for O
42/48
EPDCCH, or a total of '28 +32 = 60 'blind decodings.
[074] In a second example, UE 302 can monitor ο PDCCH for DCI 0 / IA and 1C formats and in only two aggregation levels, 4 and 8 in UESS (6 candidates in CSS and 10 candidates in UESS) and monitor EPDCCH for DCI 0 / IA, 2C formats and, optionally, in only four aggregation levels 1 and 2 (12 EPDCCH candidates). This results in '(4 + 2) * 2 + (2 + 2 + 0 + 6) * 1 = 22' blind decodings for PDCCH and '(6 + 6 + 0 + 0) * 3 = 36' blind decodings for the EPDCCH, resulting in a total of '22 +36 = 58 'blind decodings.
[075] More generally, the UE can monitor a set of control channel candidates in a subframe and the set of control channel candidates can include control channel candidates from one or more types of control channel candidates . The UE can then determine a set of control channel candidates of a first type in the monitored set of control channel candidates based on the number of types of control channel candidates monitored in the subframe. For example, a control channel candidate type can be a control channel candidate type based on a common reference signal (CRS). Another type of control channel candidate may be a type of control channel candidate based on a demodulation reference signal (DMRS). The UE can then determine the set of control channel candidates based on CRS to monitor in the subframe based on whether a type of control channel candidates (for example, only control channel candidates based on CRS) are monitored in the subframe or if two types of
43/48 control channel candidates (for example, both control channel candidates based on CRS and DMRS) are monitored in the subframe. Finally, the UE can receive downlink control (DCI) information on a control channel candidate within the monitored set of channel candidates (including the determined set of CRS-based control channel candidates) in the subframe. In one embodiment, the UE can determine the number of control channel candidate types to monitor in the subframe based on a PDSCH transmission mode configured for the UE. For example, if the UE is configured in a PDSCH transmission mode where the UE can receive PDSCH using DMRS, the UE can monitor two types of control channel candidates (for example, both CRS-based control channel candidates and DMRs) in the subframe. Otherwise, if the UE is configured in PDSCH transmission mode where the UE can receive PDSCH using CRS, but not DMRS, the UE can control a single type of control channel candidates (for example, only control channel candidates with based on CRS). In the examples above, monitoring a control channel candidate implies trying to decode a control channel candidate. Monitoring a CRS-based control channel candidate type involves trying to decode a control channel candidate using CRS for channel estimation purposes. Monitoring a DMRS-based control channel candidate type involves trying to decode a control channel candidate using DMRS for channel estimation purposes.
[076] During monitoring (ie attempt to
44/48 decode) of the control channel candidates, if the UE successfully decodes a control channel candidate (or a PDCCH control channel candidate or an EPDCCH control channel candidate), it can then receive the DCI transmitted in this control channel candidate. In order to determine whether a control channel candidate is successfully decoded, the UE can compare a set of cyclic redundancy check mask (CRC) bits associated with the DCI transmitted in the control channel candidate with the unique identifier of the UE (UEID). If the CRC mask bits match the UEID, the UE can determine that the control channel candidate decoding is successful and receive the DCI transmitted on the control channel candidate.
[077] In still other examples, BS 310 can signal (through upper layers) the set of DCI formats for which UE 302 monitors PDCCH and the set of DCI formats for which the UE monitors EPDCCH. BS 310 can also signal the set of aggregation levels and DMR antenna ports that UE 302 can use to monitor EPDCCH. Alternatively, BS 310 can signal the number of BDs that the UE 302 has to perform for PDCCH and EPDCCH monitoring and the UE can infer the set of PDCCH and EPDCCH candidates from this signaling.
[078] When providing an UE, such as UEs 301 and 302, to monitor control channel candidates using common reference signals (CRS) and monitor improved control channel candidates using Reference Reference Signals
Demodulation (DMRs) when the UE is configured in a first transmission mode to receive a traffic channel
45/48 DMRS-based downlink shared, and monitor control channel candidates using only CRS when the UE is configured in a second transmission mode to receive a CRS-based downlink shared traffic channel, the system communication 100 provides reduced blind decoding complexity in the UE. The DCI formats for which PDCCH candidates are monitored and the aggregation levels at which PDCCH candidates are monitored may change depending on whether the UE is monitoring only the PDCCH or both PDCCH and EPDCCH in the subframe.
[079] In other embodiments of the present invention, the UE can determine whether improved control channel candidates using Demodulation Reference Signals (DMRs) are monitored in a subframe, monitor, in the subframe, a set of control channel candidates using common reference signals (CRS), and receive, in the subframe, downlink control information (DCI) in a control channel candidate within the control channel candidate set, in which the control channel candidate set it is based on whether improved control channel candidates using Demodulation Reference Signals (DMRs) are monitored in the subframe. In yet other embodiments of the present invention, the UE monitors previous control channel candidates using common reference signals (CRS), monitors improved control channel candidates in a first set of aggregation levels in a first subframe, monitors control channel candidates improved control over a second set of aggregation levels across
46/48 a second subframe, in which the second set of aggregation levels is different from the first set of aggregation levels, determines the first set of aggregation levels and the second set of aggregation levels based on one or more of a type subframe, a channel state information reference signal (CSI) configuration in the subframes and a Physical Control Format Indicator (PCFICH) value signaled in the subframes, and receives control information in at least one of the monitored improved control channel candidates.
[080] In the previous specification, specific modalities have been described. However, one skilled in the art recognizes that various modifications and changes can be made without departing from the scope of the invention as defined in the claims below. In this way, the specification and figures are considered in an illustrative sense and not in a restrictive sense, and all these modifications are intended to be included within the scope of the present teachings.
[081] The benefits, advantages, solutions to problems, and any element (s) that may cause any benefit, advantage, or solution to occur or become more pronounced should not be interpreted as critical, necessary, or essential characteristics or elements of any or all claims. The invention is defined solely by the appended claims, including all changes made pending this application and all equivalents of such claims as issued.
47/48 [082] In addition, in this document, relational terms such as first and second, top and bottom, and others can only be used to distinguish an entity or action from another entity or action without necessarily requiring or implying any real relationship or order between those entities or actions. The terms comprises, comprising, has, having, includes, including, contains, containing or any other variation thereof, are intended to cover non-exclusive inclusion, such as a process, method, article or apparatus which comprises, has, includes, contains a list of elements not only includes the elements, but may include other elements that are not expressly listed or inherent in such a process, method, article, or apparatus. An element preceded by understands ... one, has ... one, includes ... one, contains ... a no, without further restrictions, prevents the existence of additional identical elements in the process, method, article or apparatus that it comprises , has, includes, contains the element. The terms one and one are defined as one or more unless explicitly stated otherwise in this document. The terms substantially, essentially, approximately, approximately, or any other version thereof, are defined as being close to as understood by one skilled in the art, and in a non-limiting modality, the term is defined to be within 10%, in another modality within 5%, in another modality within 1% and in another modality within 0.5%. The term coupled as used herein is defined as connected, although not necessarily directly, and not necessarily mechanically. A device or structure
48/48 that is configured in a certain way is configured in at least that mode, but can also be configured in ways that are not listed.
[083] The Disclosure Summary is provided to allow the reader to quickly determine the nature of the technical description. It is submitted with the understanding that it will not be used to interpret or limit the scope or meaning of the claims. Furthermore, in the previous detailed description, it can be seen that several characteristics are grouped in different modalities for the purpose of simplifying the description. This method of disclosure should not be interpreted as reflecting an intention that the claimed modalities require more resources than are expressly recited in each claim. Instead, as the following claims reflect, the objective of the invention lies in less than all the elements of a single described embodiment. Thus, the following claims are incorporated into the detailed description, with each claim standing on its own as a separately claimed matter.
1/5

权利要求:
Claims (12)
[1]
1. Method on user equipment (UE) to receive control information, the method characterized by the fact that it comprises:
monitor control channel candidates using common reference signals (CRS) and monitor improved control channel candidates using Demodulation Reference Signals (DMRs) when the UE is configured in a first transmission mode to receive a shared traffic channel from downlink based on DMRS;
monitor control channel candidates using only CRS when the UE is configured in a second transmission mode to receive a downlink shared traffic channel based on the CRS; and receiving downlink control information (DCI) in a subframe in one of the monitored control channel candidates or improved control channel candidates in the subframe.
[2]
2. Method, according to claim 1, characterized by the fact that the first mode of transmission is transmission mode 9.
[3]
3. Method according to claim 1, characterized by the fact that the second mode of transmission is one of the modes of transmission 1, 2, 3, 4, 5, and 6.
[4]
4. Method, according to claim 1, characterized by the fact that monitoring control channel candidates using CRS also comprises monitoring Downlink Control Channel candidates
2/5
Physical (PDCCH), where monitoring improved control channel candidates using DMRS further comprises monitoring improved Physical Downlink Control Channel (EPDCCH) candidates, and where the downlink shared traffic channel is a Shared Link Channel Physical Descendant (PDSCH).
[5]
5. Method on user equipment (UE) for receiving control information, the method characterized by the fact that it comprises:
receive a subframe;
determine whether improved control channel candidates using Demodulation Reference Signals (DMRs) are monitored in the subframe, monitor, in the subframe, a set of control channel candidates using common reference signals (CRS), and
receive, in the subframe, information control in downlink (DCI) in one candidate in channel in control within the set in candidates in channel in
control;
where the set of control channel candidates is based on whether improved control channel candidates using Demodulation Reference Signals (DMRs) are monitored in the subframe.
[6]
6. Method on user equipment to receive control information, the method characterized by the fact that it comprises:
monitor improved control channel candidates in a first set of aggregation levels in a first subframe;
3/5 monitor improved control channel candidates in a second set of aggregation levels in a second subframe, where the second set of aggregation levels is different from the first set of aggregation levels;
determine the first set of aggregation levels and the second set of aggregation levels based on one or more of a subframe type of subframes, a channel state information reference signal (CSI) configuration in the subframes, and a value of Physical Control Format Indicator Channel (PCFICH) signaled in the subframes, and receive control information in at least one of the monitored improved control channel candidates.
[7]
7. User equipment capable of receiving control information, user equipment characterized by the fact that it comprises:
a wireless transceiver, and a signal processing unit coupled to the transceiver and which is configured to monitor control channel candidates via common reference signals (CRS) and monitor improved control channel candidates using demodulation reference signals ( DMRs) when the UE is configured in first transmission mode to receive a DMRS-based downlink shared traffic channel, monitor control channel candidates using only CRS when the UE is configured in a second transmission mode to receive a downlink shared traffic channel based on CRS, and receive downlink control information (DCI) in a subframe in a
4/5 of monitored control channel candidates or improved control channel candidates in the subframe.
[8]
8. User equipment capable of receiving control information, user equipment characterized by the fact that it comprises:
a wireless transceiver, and a signal processing unit coupled to the transceiver and configured to receive a subframe, determine whether improved control channel candidates using demodulation reference signals (DMRs) are monitored in the subframe, monitor in the subframe , a set of control channel candidates using common reference signals (CRS), and receiving, in the subframe, downlink control (DCI) information on a control channel candidate within the control channel candidate set, where the set of control channel candidates is based on whether improved control channel candidates using demodulation reference signals (DMRS) are monitored in the subframe.
[9]
9. User equipment capable of receiving control information, user equipment characterized by the fact that it comprises:
a wireless transceiver, and a signal processing unit attached to the transceiver and which is configured to, monitor improved control channel candidates in a first set of aggregation levels in a first subframe, monitor improved control channel candidates in a second set of aggregation levels in a second subframe, in
5/5 that the second set of aggregation levels is different from the first set of aggregation levels, determining the first set of aggregation levels and the second set of aggregation levels based on one or more of a subframe type of subframes, a channel state information reference signal (CSI) setting in the subframes, and a Physical Control Format Indicator (PCFICH) value signaled in the subframes, and receiving control information on at least one of the channel candidates improved control systems monitored.
[10]
10. Method in a user equipment (UE) to receive control information, the method characterized by the fact that it comprises:
monitor a set of control channel candidates in a subframe, the set of control channel candidates comprising one or more types of control channel candidates, the types of control channel candidates including control channel candidate based on common reference signals (CRS), and channel candidate
control with base in signs in reference demodulation (DMRs);to determine one set in candidates channel in control with base in CRS at the set monitored in
control channel candidates based on a number of types of monitored control channel candidates;
receiving downlink control (DCI) information on a control channel candidate within the monitored set of control channel candidates including the determined set of control channel candidates based on CRS in the subframe.
1/12

[11]
12/11

[12]
12/12

类似技术:

---

公开号 | 公开日 | 专利标题

---

BR112014003570A2|2018-08-14|method and apparatus for control channel transmission and reception

---

JP6254659B2|2017-12-27|Method and apparatus for receiving or transmitting a downlink control signal in a wireless communication system

---

US9197387B2|2015-11-24|Method and apparatus for control channel transmission and reception

---

US9913232B2|2018-03-06|Method for receiving synchronization information for direct communication between user equipment and apparatus for same

---

US9521664B2|2016-12-13|EPDCCH resource and quasi-co-location management in LTE

---

US9572148B2|2017-02-14|Method and apparatus for transceiving a downlink control channel in a wireless communication system

---

CN107979447B|2020-12-11|Method for exchanging control information in communication system and apparatus for transmitting control information

---

TWI617163B|2018-03-01|Systems and methods for an enhanced control channel

---

KR101520214B1|2015-05-13|Methods and systems of wireless communication with remote radio heads

---

WO2018027908A1|2018-02-15|Dynamic multi-beam transmission for new radio technology multiple-input multiple-output

---

US20150215908A1|2015-07-30|Method and device for receiving downlink signal in wireless communication system

---

US9516636B2|2016-12-06|Method and apparatus for transceiving a downlink control channel in a wireless communication system

---

KR20150030661A|2015-03-20|Method for receiving or transmitting downlink signal in wireless communication system and device therefor

---

KR20140017650A|2014-02-11|Methods and systems of wireless communication with remote radio heads

---

US20150208391A1|2015-07-23|Method for transmitting control information on transmission points and corresponding transmission point, as well as method for mapping uplink control channel resource of terminal and corresponding terminal

---

KR101594376B1|2016-02-26|Method and apparatus for allocating resources in wireless communication system

---

BR112019023460A2|2020-06-30|terminal and communication method for a terminal

---

US20210385045A1|2021-12-09|Determining phase tracking reference signals in multiple transmission points

---

US20190074944A1|2019-03-07|User terminal, radio base station and radio communication method

---

EP3832925A1|2021-06-09|User terminal and radio communication method

---

WO2021091449A1|2021-05-14|Determining phase tracking reference signals in multiple transmission points

同族专利:

---

公开号 | 公开日

---

WO2013025677A2|2013-02-21|

---

US20130044664A1|2013-02-21|

---

EP2745445A2|2014-06-25|

---

JP2014527344A|2014-10-09|

---

US9252918B2|2016-02-02|

---

WO2013025677A3|2013-04-25|

---

CN103931128A|2014-07-16|

---

KR101622967B1|2016-05-23|

---

JP5751654B2|2015-07-22|

---

CN103931128B|2017-02-08|

---

EP2745445B1|2018-04-18|

---

KR20140036024A|2014-03-24|

---

ZA201400432B|2020-05-27|

---

MX2014001797A|2014-03-31|

引用文献:

---

公开号 | 申请日 | 公开日 | 申请人 | 专利标题

---

---

EP2566091B1|2007-06-20|2014-12-31|Motorola Mobility LLC|Method and device for candidate control channels|

---

US8739013B2|2007-09-28|2014-05-27|Lg Electronics Inc.|Method for detecting control information in wireless communication system|

---

JP5603864B2|2008-07-30|2014-10-08|エルジーエレクトロニクスインコーポレイティド|Data receiving method and apparatus in wireless communication system|

---

KR101487553B1|2008-03-20|2015-01-30|엘지전자 주식회사|Method for monitoring control channel in wireless communication|

---

KR101611272B1|2008-11-07|2016-04-11|엘지전자 주식회사|Method for transmitting a reference signal|

---

KR101697783B1|2009-05-14|2017-01-19|엘지전자 주식회사|Method and apparatus for monitoring control channel in multiple carrier system|

---

US8340676B2|2009-06-25|2012-12-25|Motorola Mobility Llc|Control and data signaling in heterogeneous wireless communication networks|

---

WO2011011566A2|2009-07-24|2011-01-27|Interdigital Patent Holdings, Inc.|Method and apparatus for obtaining demodulation reference signal port index information|

---

KR101641968B1|2009-09-14|2016-07-29|엘지전자 주식회사|Method and appraturs for transmitting downlink signal in a mimo wireless communication system|

---

WO2011085195A1|2010-01-11|2011-07-14|Research In Motion Limited|System and method for control channel interference management and extended pdcch|

---

WO2011115532A1|2010-03-16|2011-09-22|Telefonaktiebolaget L M Ericsson |Switching between open and closed loop multi-stream transmission|

---

US20110243059A1|2010-04-05|2011-10-06|Samsung Electronics Co., Ltd.|Apparatus and method for interleaving data in a relay physical downlink control channel |

---

KR101684867B1|2010-04-07|2016-12-09|삼성전자주식회사|Transmission and reception method of control information to exploit the spatial multiplexing gain|

---

AU2011241273B2|2010-04-13|2014-03-13|Lg Electronics Inc.|Method and device for receiving downlink signal|

---

CN102845121B|2010-04-13|2016-05-04|Lg电子株式会社|For the method and apparatus of receiving downlink signal|

---

US9166719B2|2010-04-28|2015-10-20|Lg Electronics Inc.|Method of transmitting and receiving signals in a mobile communication system using a radio frame including multiple types of subframes and apparatus thereof|

---

US9276722B2|2010-05-05|2016-03-01|Qualcomm Incorporated|Expanded search space for R-PDCCH in LTE-A|

---

WO2011142576A2|2010-05-11|2011-11-17|엘지전자 주식회사|Method and apparatus for receiving downlink signals|

---

EP2573955A4|2010-05-17|2017-08-02|LG Electronics Inc.|Method and apparatus for transmitting and receiving downlink control information for repeater|

---

JP5726189B2|2010-07-21|2015-05-27|パナソニック インテレクチュアル プロパティ コーポレーション オブアメリカＰａｎａｓｏｎｉｃ Ｉｎｔｅｌｌｅｃｔｕａｌ Ｐｒｏｐｅｒｔｙ Ｃｏｒｐｏｒａｔｉｏｎ ｏｆ Ａｍｅｒｉｃａ|Terminal device, receiving method, and integrated circuit|

---

EP2597919A4|2010-07-21|2015-06-24|Panasonic Ip Corp America|Base station, terminal, search space setting method and decoding method|

---

CN106877991B|2011-02-11|2020-06-26|交互数字专利控股公司|System and method for enhanced control channel|

---

TWI580208B|2011-04-29|2017-04-21|內數位專利控股公司|Open loop spatial processing|

---

CN102231913B|2011-06-17|2015-08-19|电信科学技术研究院|A kind of method, system and equipment distributing and determine PDCCH|

---

JP5898874B2|2011-07-15|2016-04-06|株式会社Ｎｔｔドコモ|User terminal, radio base station apparatus, radio communication system, and radio communication method|

---

WO2013025558A1|2011-08-12|2013-02-21|Interdigital Patent Holdings, Inc.|Interference measurement in wireless networks|KR101703864B1|2010-04-29|2017-02-22|엘지전자 주식회사|A method and a base station for transmitting control information, and a method and a user equipment for receiving control information|

---

CN103201972B|2010-11-08|2018-10-19|三星电子株式会社|The method and apparatus for receiving different form subframe in a wireless communication system|

---

CN103636151B|2011-06-30|2017-02-15|Lg电子株式会社|Method and apparatus for allocating a downlink control channel in a wireless communication system|

---

JP5884152B2|2011-07-29|2016-03-15|シャープ株式会社|Base station, terminal, communication system and communication method|

---

US9008035B2|2011-09-29|2015-04-14|Futurewei Technologies, Inc.|Wireless communication control channel systems and methods|

---

EP2761955B1|2011-09-30|2017-07-26|Interdigital Patent Holdings, Inc.|Device communication using a reduced channel bandwidth|

---

US9614654B2|2011-10-03|2017-04-04|Qualcomm Incorporated|Adaptive control channel design for balancing data payload size and decoding time|

---

WO2013053135A1|2011-10-14|2013-04-18|Nokia Siemens Networks Oy|Method for allocating a transmission mode to a user equipment and apparatus thereof|

---

US9660782B2|2011-10-19|2017-05-23|Lg Electronics Inc.|Method and apparatus for transceiving downlink control information in a wireless access system|

---

US9226293B2|2011-10-20|2015-12-29|Lg Electronics Inc.|Method and apparatus for transmitting control information in wireless communication system|

---

US9408096B2|2011-11-01|2016-08-02|Lg Electronics Inc.|Method and wireless device for monitoring control channel|

---

US10079658B2|2011-11-04|2018-09-18|Qualcomm Incorporated|Search space design for e-PDCCH in wireless communication networks|

---

CN105846984B|2011-11-04|2019-04-23|华为技术有限公司|Send and receive method, user equipment and the base station of control channel|

---

ES2728444T3|2011-11-14|2019-10-24|Samsung Electronics Co Ltd|Procedure for assigning reference signaling resources for transmission of control channel in wireless communication system|

---

US9578532B2|2011-11-25|2017-02-21|Lg Electronics Inc.|Method and apparatus for measuring channel quality indicator in wireless communication system|

---

WO2013085336A1|2011-12-07|2013-06-13|엘지전자 주식회사|Method and apparatus for transceiving a downlink control channel in a wireless communication system|

---

WO2013100645A1|2011-12-27|2013-07-04|엘지전자 주식회사|Method and device for receiving data in wireless communication system|

---

WO2013105821A1|2012-01-11|2013-07-18|엘지전자 주식회사|Method and apparatus for receiving signal in wireless communication system|

---

US9609675B2|2012-01-16|2017-03-28|Lg Electronics Inc.|Method and apparatus for monitoring control channel|

---

WO2013112972A1|2012-01-27|2013-08-01|Interdigital Patent Holdings, Inc.|Systems and/or methods for providing epdcch in a multiple carrier based and/or quasi-collated network|

---

US9635658B2|2012-02-27|2017-04-25|Samsung Electronics Co., Ltd.|Adaptation of control signaling transmissions to variations in respective resources|

---

US20130229957A1|2012-03-01|2013-09-05|Futurewei Technologies, Inc.|System and Method For Device-To-Device Communication|

---

KR102065420B1|2012-03-01|2020-01-13|엘지전자 주식회사|Method for setting search region to detect downlink control channel in wireless communication system and apparatus for same|

---

JP6399728B2|2012-03-15|2018-10-03|シャープ株式会社|Base station apparatus, terminal apparatus, communication method, and integrated circuit|

---

CN103327521B|2012-03-20|2016-12-14|上海贝尔股份有限公司|For distributing and detect method and the equipment of downlink control channel resource|

---

CN103327591A|2012-03-21|2013-09-25|北京三星通信技术研究有限公司|Power control method of SRS|

---

KR102086506B1|2012-03-30|2020-03-09|엘지전자 주식회사|The method of receiving control information in wireless communication system and apparatus thereof|

---

US9660783B2|2012-03-30|2017-05-23|Lg Electronics Inc.|Method and device for receiving control information in wireless communication system|

---

KR20130111999A|2012-04-02|2013-10-11|엘지전자 주식회사|Method of configuring resource blocks for search space of distributed downlink control channel in wireless communication system and apparatus thereof|

---

US9143977B2|2012-04-13|2015-09-22|Qualcomm Incorporated|Background traffic handling in LTE|

---

KR102047698B1|2012-04-13|2019-12-04|엘지전자 주식회사|Method of configuring search space for downlink control channel in wireless communication system and appratus thereof|

---

US9585125B2|2012-05-03|2017-02-28|Samsung Electronics Co., Ltd|Reference signals and common search space for enhanced control channels|

---

US10448379B2|2012-05-04|2019-10-15|Texas Instruments Incorporated|Enhanced downlink control channel configuration for LTE|

---

CN103391563B|2012-05-11|2018-06-08|中兴通讯股份有限公司|Downlink control information sending method, detection method, base station and user equipment|

---

GB2504544A|2012-08-02|2014-02-05|Nec Corp|Resource allocation signalling within an enhanced Physical Downlink Control Channel |

---

US9479301B2|2012-09-07|2016-10-25|Samsung Electronics Co., Ltd|Multiplexing resource element groups for control channel elements of control channels|

---

EP2897435B1|2012-09-17|2019-11-06|LG Electronics Inc.|Method and apparatus for receiving downlink signal in wireless communication system|

---

WO2014046503A1|2012-09-18|2014-03-27|엘지전자 주식회사|Method and apparatus for receiving system information in wireless communication system|

---

CN104662827B|2012-09-21|2017-11-14|Lg电子株式会社|The method and apparatus for receiving in a wireless communication system or sending downlink control signal|

---

WO2014052412A2|2012-09-26|2014-04-03|Interdigital Patent Holdings, Inc.|Methods, systems and apparatuses for operation in long-term evolutionsystems|

---

US20140086135A1|2012-09-27|2014-03-27|Alcatel-Lucent Usa Inc.|Method And Apparatus For Indicating EPDCCH Subframe Allocation|

---

GB2506403B|2012-09-28|2018-01-03|Sony Corp|Assigning mode of virtual channel operation to mobile terminal|

---

IN2015DN00781A|2012-10-06|2015-07-03|Ericsson Telefon Ab L M|

---

US20150351063A1|2012-10-12|2015-12-03|Broadcom Corporation|Sch-linked rs configurations for new carrier type|

---

WO2014067141A1|2012-11-02|2014-05-08|华为技术有限公司|Allocation method for control channel candidate number and blind detection frequency, base station and user equipment|

---

US9386576B2|2012-11-14|2016-07-05|Qualcomm Incorporated|PUCCH resource determination for EPDCCH|

---

CN103929289B|2013-01-16|2017-04-05|上海贝尔股份有限公司|For determining the method and device of the ECCE search spaces of the EPDCCH of cross-carrier scheduling|

---

WO2014110778A1|2013-01-18|2014-07-24|富士通株式会社|Method and device for transmitting downlink control information and determining search space|

---

WO2014113938A1|2013-01-23|2014-07-31|Telefonaktiebolaget L M Ericsson |Radio base station and method for precoding signal|

---

US9521637B2|2013-02-14|2016-12-13|Blackberry Limited|Small cell demodulation reference signal and initial synchronization|

---

CN105027654B|2013-03-08|2019-01-11|夏普株式会社|Terminal installation, base station apparatus and communication means|

---

CN105075364B|2013-03-08|2018-12-25|夏普株式会社|Terminal installation, base station apparatus and communication means|

---

EP2975894A1|2013-03-13|2016-01-20|Sharp Kabushiki Kaisha|Terminal, base station, communication system, communication method and integrated circuit|

---

WO2014171683A1|2013-04-14|2014-10-23|Lg Electronics Inc.|Method and apparatus for controlling monitoring timing in wireless communication system|

---

CN105144609B|2013-04-23|2018-08-03|Lg 电子株式会社|The method and apparatus for controlling data transmission in a wireless communication system|

---

KR20140136736A|2013-05-21|2014-12-01|주식회사 팬택|Apparatus and method for transmitting and receiving control channel in wireless communication system based on nct|

---

EP3002983B1|2013-07-16|2021-09-22|Huawei Technologies Co., Ltd.|Control information transmission method, user equipment, and base station|

---

JP2016532350A|2013-09-30|2016-10-13|華為技術有限公司Ｈｕａｗｅｉ Ｔｅｃｈｎｏｌｏｇｉｅｓ Ｃｏ．，Ｌｔｄ．|Control information transmission method, user equipment, and base station|

---

CN108712239B|2013-09-30|2022-02-01|华为技术有限公司|Control information transmission method, user equipment and base station|

---

EP2874454A1|2013-11-15|2015-05-20|Fujitsu Limited|Reference signals in wireless communication|

---

CN111800247A|2014-05-29|2020-10-20|华为技术有限公司|Information transmission method and device|

---

US10939454B2|2014-12-11|2021-03-02|Qualcomm Incorporated|Prioritizing colliding transmissions in LTE and ultra-low latency LTE communications|

---

JP2018107483A|2015-05-08|2018-07-05|シャープ株式会社|Terminal and base station device|

---

US10103856B2|2015-05-12|2018-10-16|Qualcomm Incorporated|Transmission time interval operation for low latency|

---

JP2018110277A|2015-05-14|2018-07-12|シャープ株式会社|Terminal device and base station device|

---

US10652753B2|2015-07-24|2020-05-12|Samsung Electronics Co., Ltd.|Method for transmitting control signal and channel in mobile communication system using unlicensed band|

---

EP3329626A4|2015-07-30|2019-03-27|Intel IP Corporation|Physical broadcast channel design|

---

EP3371910A1|2015-11-04|2018-09-12|Interdigital Patent Holdings, Inc.|Methods and procedures for narrowband lte operation|

---

TWI720052B|2015-11-10|2021-03-01|美商Ｉｄａｃ控股公司|Wireless transmit/receive unit and wireless communication method|

---

US10313168B2|2015-12-11|2019-06-04|Lg Electronics Inc.|Method and user equipment for receiving downlink channel, and method and base station for transmitting downlink channel|

---

KR20210080588A|2016-02-02|2021-06-30|닛본 덴끼 가부시끼가이샤|Method and apparatus for communication based on short transmission time intervals in wireless communication system|

---

US10085256B2|2016-02-16|2018-09-25|Qualcomm Incorporated|Downlink operations with shortened transmission time intervals|

---

US10660081B2|2016-06-01|2020-05-19|Lg Electronics Inc.|Downlink signal reception method and user equipment, and downlink signal transmission method and base station|

---

US10602564B2|2016-08-31|2020-03-24|Telefonaktiebolaget Lm Ericsson |User equipment and control channel monitoring method thereof, network node and control channel configuration and transmission method thereof|

---

CN106452683B|2016-12-07|2019-04-30|中国联合网络通信集团有限公司|The switching method of different transmission mode and base station in a kind of lte-a system|

---

US10608779B2|2017-02-06|2020-03-31|Qualcomm Incorporated|Search space configuration for new radiosystem|

---

US10333740B2|2017-09-10|2019-06-25|At&T Intellectual Property I, L.P.|Facilitating determination of transmission type via demodulation reference signal patterns|

---

US10849123B2|2017-11-17|2020-11-24|Qualcomm Incorporated|Techniques and apparatuses for slot-based and non-slot-based scheduling in 5G|

---

CN109818723B|2017-11-21|2020-12-29|中国移动通信有限公司研究院|Method for data transmission, network side equipment and terminal|

---

CN110166191B|2018-02-11|2021-01-08|维沃移动通信有限公司|Method and device for determining monitoring information of search space|

---

CN110351041B|2018-04-04|2022-01-28|中兴通讯股份有限公司|Method and device for mapping physical downlink control channel|

---

US10673588B2|2018-05-14|2020-06-02|At&T Intellectual Property I, L.P.|Shared demodulation reference signal design for control channels in 5G or other next generation networks|

---

CN110620642B|2018-06-20|2021-02-09|上海华为技术有限公司|Method and device for allocating time-frequency resources|

法律状态:
2018-08-28| B15I| Others concerning applications: loss of priority|Free format text: VIDE PARECER |

---

2018-09-25| B25A| Requested transfer of rights approved|Owner name: GOOGLE TECHNOLOGY HOLDINGS LLC (US) |

---

2018-11-06| B12F| Appeal: other appeals|

---

2020-07-14| B06F| Objections, documents and/or translations needed after an examination request according [chapter 6.6 patent gazette]|

---

2020-07-21| B06U| Preliminary requirement: requests with searches performed by other patent offices: procedure suspended [chapter 6.21 patent gazette]|

---

2020-11-24| B11B| Dismissal acc. art. 36, par 1 of ipl - no reply within 90 days to fullfil the necessary requirements|

---

2021-08-24| B350| Update of information on the portal [chapter 15.35 patent gazette]|

优先权:

---

申请号 | 申请日 | 专利标题

---

US201161523568P| true| 2011-08-15|2011-08-15|

---

US13/569,646|US9252918B2|2011-08-15|2012-08-08|Method and apparatus for control channel transmission and reception|

---

PCT/US2012/050700|WO2013025677A2|2011-08-15|2012-08-14|Method and apparatus for control channel transmission and reception|

---