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    • 专利摘要:
    discovery of the reference signal port involving transmission points. a method includes receiving information indicating one or more sets of reference signal patterns from a first transmission point, wherein at least one of the indicated set(s) of reference signal patterns corresponds to a from one or more other transmission points; measuring channel quality for the indicated reference signal pattern sets and communicating indications of the measured channel quality for the indicated reference signal pattern set(s) to the first transmission point. another method includes transmitting information indicating one or more sets of reference signal patterns from a first transmission point to user equipment, wherein at least one of the set(s) of reference signal patterns indicated reference corresponds to one or more other points of transmission and reception from the user equipment of channel quality measurement indications for the indicated reference signal pattern set(s).
    公开号:BR112013025961B1
    申请号:R112013025961-2
    申请日:2012-04-10
    公开日:2022-01-04
    发明作者:Timo Erkki Lunttila；Klaus Hugl；Cassio Ribeiro
    申请人:Nokia Solutions And Networks Oy；
    IPC主号:
    专利说明:

    TECHNICAL FIELD
    The present invention relates generally to radio frequency communications and more specifically relates to the mobility of a wireless device. BACKGROUND
    This section is intended to provide the background or context of the invention that is detailed in the claims. The present description may include concepts that can be followed but are not necessarily concepts that have been previously elaborated or followed. Therefore, unless otherwise stated, what is described in this section does not constitute prior art of the description and claims of the present patent application and is not admitted as prior art in this section.
    The following abbreviations that may be found in this specification and/or figures are defined as follows: 3GPP third generation partnership project BS base station coordinated multipoint COMP
    CSI (channel state information) channel state informationCSI-RS (channel state information - reference signals) channel state information - reference signalsCQI (channel quality indicator) channel quality indicatorDL (downlink) downlink (from base station to the user equipment)DM-RS (demodulation reference symbols) demodulation reference symbolseNB Node B E-UTRAN (evolution of Node B, also eNodeB)E-UTRAN evolution of UTRAN (LTE)LTE long term evolution of UTRAN (E -UTRAN)LTE-A Advanced LTEMCS (modulation and coding scheme) modulation and coding scheme MIMO (multiple input multiple output) multiple input multiple outputMME (mobility management entity) mobility management entityNCE (network control element) network control elementPDSCH (physical downlink shared channel) physical downlink shared channel PMI (precoding matrix indicator) precoding matrix indicator PUCCHPUSCH (physical uplink control channel) ) physical uplink shared channel physical uplink shared channel5 OFDM (orthogonal frequency division multiplexing) OFDMA (orthogonal frequency division multiple access) King version10 TM TS transmission mode technical standard RAT (radio access technology) radio access technology RRH (remote radio head) remote radio head RS signal/reference symbol15 RSRP (reference symbol received power) reference symbol received power RSRP (reference symbol received quality) reference symbol received quality SC-FDMA (single carrier, frequency division multiple access) single carrier20, frequency division multiple access SGW (serving gateway) service gateway SRS (sounding reference symbols) symbols survey reference UE user equipment, such as a mobile station, node25 mill vel or mobile terminal UL uplink (from user equipment to base station) UTRAN (universal terrestrial radio access network) universal terrestrial radio access network30 WCDMA (wideband code division multiple access) broadband code division multiple access
    Coordinated multipoint transmission and reception (COMP) is one of the technologies investigated in 3GPP LTE-A to specifically boost cell periphery data rates to create a more uniform data rate experience for the end user across the entire cell area. cell. COMP techniques involve greater collaboration between different transmit/receive points (eg eNodeBs, RRHs, hotspots, home eNodeBs, etc.) in DL transmissions to UE and UL receptions from UE. In Rei. 10 there was a point under study related in 3DPP, but the point under study was suspended. The study point was recently restarted in 3GPP, in January 2011, according to the study point description. In addition, agreement was reached on different scenarios under investigation in 3GPP for the point-under-study phase. One of the agreed scenarios (RAN1 meeting #63bis, Dublin, January 2011) focuses on a network with low power RRHs within coverage with macro cells, where the transmit/receive points created by the RRHs have the same cell IDs as the macro cell. This situation is called "single-cell COMP". BRIEF SUMMARY
    An exemplary method includes receiving indicator information of one or more sets of reference signal patterns from a first transmission point, wherein at least one of the indicated set(s) of reference signal patterns corresponds to one of one or more other transmission points; measuring the channel quality for the indicated reference signal pattern set(s)(s) and recording indications of the measured channel quality for the indicated reference signal pattern set(s)(s) for the first transmission point.
    An exemplary apparatus includes one or more processors and one or more memories with computer program code. The memory(s) and computer program code are configured to, with the processor(s), cause the apparatus to do at least the following: receive information indicative of one or more sets of signal patterns from a first transmission point, wherein at least one of the indicated reference signal pattern set(s) corresponds to one or more other transmission points; measuring the channel quality for the indicated reference signal pattern set(s)(s) and recording indications of the measured channel quality for the indicated reference signal pattern set(s)(s) for the first transmission point.
    In a further embodiment, a computer program includes a computer readable memory provided with computer program code embodied therein for use with a computer. The computer program code includes: code for receiving information indicating one or more sets of reference signal patterns from a first transmission point, wherein at least one of the set(s) of reference signal patterns indicated reference corresponds to one of one or more other transmission points; code for measuring channel quality for the indicated set(s) of reference signal standards and code for recording the indications of measured channel quality for the set(s) of reference signal standards indicated for the first transmission point.
    Another exemplary method includes transmitting indicator information of one or more sets of reference signal patterns from a first transmission point to user equipment, wherein at least one of the set(s) of reference signal patterns indicated reference signal corresponds to one or more other points of transmission and reception from the user equipment of channel quality measurement indications for the indicated reference signal pattern set(s).
    Another exemplary embodiment includes an apparatus that includes one or more processors and one or more memories with computer program code. The memory(s) and computer program code are configured to, with the processor(s), cause the apparatus to perform at least the following: transmitting information indicative of one or more sets of signal patterns from a first transmission point to the user equipment, wherein at least one of the indicated reference signal pattern set(s) corresponds to one or more other transmission and reception points from from the user equipment of channel quality measurement indications for the indicated set(s) of reference signal standards.
    In a further embodiment, a computer program includes a computer readable memory provided with computer program code embodied therein for use with a computer. Computer program code is code for transmitting information indicating one or more sets of reference signal patterns from a first transmission point to user equipment, wherein at least one of the set(s) of indicated reference signal patterns corresponds to one or more other transmission points and the code for reception from the user equipment of channel quality measurement indications for the set(s) of signal patterns of reference(s). BRIEF DESCRIPTION OF THE DRAWINGS
    The foregoing and other aspects of the present invention are made more evident in the Detailed Description of the following Example Embodiments when taken in conjunction with the accompanying Figures, in which:
    FIG. 1 shows a simplified block diagram of various electronic devices that are suitable for use in the practical application of exemplary embodiments of the present invention. FIG. 2 reproduces Figure 4 of 3GPP TS 36300 and shows the general architecture of the EUTRAN system and illustrates an example embodiment in which the base station of FIG. 1 is incorporated as an eNB in an LTE or LTE-A type of wireless communication system. FIG. 3 is a diagram illustrating a data transmission procedure using CSI-RS. FIG. 4 is an example of a macro cell with multiple transmission points within the macro cell. FIG. 5 is an example of a CSI-RS squelch pattern combined with the CSI-RS ports with specific configuration for UE and the channel and signal quality measured and recorded by a user equipment. FIG. 6 is an example of a CSI-RS squelch pattern combined with the CSI-RS ports with specific configuration for UE and the channel and signal quality measured and recorded by a user equipment. FIG. 7 shows an example of how the CSI-RS squelch pattern is mapped to corresponding resource elements in a resource space. FIG. 8 is a signaling diagram illustrating an example procedure for measuring, determining, and signaling the CSI-RS antenna ports to be configured. FIG. 9 is a block diagram of an example method performed by a user equipment for discovering the reference signal port involving transmission points. FIG. 10 is a block diagram of an example method performed by a transmission point in a cell for discovering the reference signal port involving transmission points in the cell. DETAILED DESCRIPTION OF THE FIGURES
    Before describing the exemplary embodiments of the present invention in more detail, reference is made to FIG. 1 for illustrating a simplified block diagram of various apparatus that are suitable for use in practicing exemplary embodiments of the present invention. In FIG. 1, a wireless network 90 includes an eNB 12, an NCE/MME/SGW 14, and a transmission point, such as RRH 130. The wireless network 90 is adapted for wireless link communication 35 with an apparatus, such as a mobile communication device, which may be designated as a UE 10, via a network access node, such as a node B (base station) and more specifically an eNB 12. The network 90 may include a control element network control element (NCE) 14 which may include MME/SGW functionality and which provides connectivity to another network, such as the telephone network and/or data communications network 85 (e.g. the internet) via the 25. The NCE 14 includes a controller, such as at least a computer or data processor (DP) 14A and at least one non-transient, computer-readable memory medium, such as a memory (MEM) 14B that stores a computer instruction program (PROG) 10C.
    The UE 10 includes a controller, such as at least a computer or data processor (DP) 10A, and at least one non-transient, computer-readable memory medium, such as a memory (MEM) 10B that stores a program of computer instructions (PROG) 10C and at least one radio frequency (RF) transceiver 10D for two-way wireless communications with the eNB 12 via one or more antennas 10E. The eNB 12 includes a controller, such as at least a computer or a data processor (DP) 12A and at least one computer readable memory medium, embodied in a memory (MEM) 12B that stores a program of computer instructions ( PROG) 10C and at least one RF transceiver 12D for communications with the UE 10 via one or more antennas 12E (typically multiple when multiple-input, multiple-output (MIMO) operation is in use). The eNB 12 is coupled via a data and control path 13 to the NCE 14. The path 13 can be implemented with an S1 interface. The eNB 12 can still be coupled to another transmission point via the data and control path 15 which can be implemented as an X2 interface in the case of another logical base station or it can be a direct eNodeB internal interface, e.g. fiber optic link for connecting transmission points such as remote radio head (RRH) 130 to eNB 12. Typically, eNB 4 comprises a single macro cell (shown in FIG. 4) via one or more antennas 12E.
    In this example, the transmission point 130 includes a controller, such as at least a computer or data processor (DP) 130A and at least one non-transient, computer-readable memory medium, such as a memory (MEM) 130B which stores a computer instruction program (PROG) 130C and at least one RF transceiver 130D for communications with the UE 10 via one or more antennas 130E. (As indicated above, typically several in case of multiple-input, multiple-output (MIMO) operation. Transmission point 130 communicates with UE 10 over link 36. Transmission point 130 may communicate, depending on the implementation, with the eNB 12 using a data and control path 15. The transmit point 130 can be another eNodeB or can be logically part of the eNB 12 as, e.g., allowed by a Remote Radio Head (RRH) and creates a certain local hotspot coverage 410 within the macro cell coverage area (as shown in FIG. 4) For single cell MIMO - all transmission points 130 (see also FIG. 4) are under full control of a single eNB 12 Thus, there is centrally a unit to which several transmission points/RRHs 130 itself are connected. The idea is that the transmission points 130 and the eNB macro 12 are centrally controlled together. The control is typically found in the eNB location 12 m acro, but it can also be located at a location that is connected to the eNB 12 and the transmission point 130.
    It is assumed that at least one of PROGs, 10C, 12C and 130C includes programming instructions which, when executed by the associated DP, allow the corresponding apparatus to operate in accordance with exemplary embodiments of the present invention, as will be discussed in more detail below. . That is, the exemplary embodiments of the present invention can be implemented at least in part by computer software, executable by the DP 10A of the UE 10 and/or by the DP12A of the eNB 12 and/or by the DP 130A of the base station 120 or via hardware (eg an integrated circuit configured to perform one or more of the operations described herein) or a combination of software and hardware (and firmware).
    In general, the various embodiments of the UE 10 may include, without limitation, mobile phones, tablets with wireless connectivity, personal organizers (PDAs) with wireless communication capability, laptop computers with wireless communication capability, image capture devices , such as digital cameras with wireless communication capabilities, game consoles with wireless communication capabilities, music storage and playback devices with wireless communication capabilities, , internet connection devices that allow wireless access and browsing, as well as portable units or terminals that incorporate combinations of these functions.
    Computer readable memories 10B, 12B and 130B can be of any type suitable for the local technical environment and can be implemented using any suitable data storage technology such as semiconductor based memory devices, random access memory (RAM) , read-only memory, read-only programmable memories, flash memories, magnetic memory devices and systems, optical memory devices and systems, fixed memory and removable memory. Data processors 10A, 12A and 130A may be of any type suitable for the local technical environment, and may include one or more general purpose computers, special purpose computers, microprocessors, digital signal processors (DSPs) and processors based on multi-core processing architectures, by way of non-restrictive examples.
    In a non-restrictive embodiment, the BS 12 can be implemented as an eNB if the wireless network 1 is a long-term evolution (LTE) or an LTE-Advanced (LTE-A) E-UTRAN type network. FIG. 2 shows the general architecture of the E-UTRAN system. Network 90 includes a core network that includes at least one service gateway (SG-W in FIG. 2 and SGW in FIG. 1) and may include at least one mobility management entity (MME) in the present description. collectively presented as MME/S-GW. In this system, the DL access technique is OFDMA and the UL access technique is SC-FDMA.
    Now that the example apparatuses have been described, further detailed description is made based on exemplary embodiments of the invention. Exemplary embodiments of the present invention pertain to DL COMP operation in general but specifically also to the intended single cell mode of operation ("single cell COMP") of coordinated multipoint transmission and reception that has been described above.
    In the LTE 10 version, one of the main new features is the introduction of CSI-RS (Channel Status Information - Reference Signals). The idea is to transmit separate cell-specific RS for CSI estimation purposes in some selected subframes with e.g. 10 ms (milliseconds) periodicity. Turning to FIG. 3, a diagram illustrating a data transmission procedure using CSI-RS is shown. The UE estimates the CSI ("CSI measurement") based on the CSI-RS transmitted by the eNodeB and transmits the CSI response ("CSI report") to the eNodeB, which in turn can use the CSI in precoder selection. for the data. In reference 3, the data is transmitted together with specific (i.e. dedicated) demodulation reference symbols (DM-RS), spanning the same physical resource blocks as the data. The same precoding is applied for DM-RS and data. It allows the use of any precoding by eNodeB, as the applied precoding remains transparent to the user's equipment and does not need to be assigned to the user's equipment.
    In addition to transmitting CSI-RS to a cell (eg macro cells) LTE Rel-10 also provides a possibility to configure other CSI-RS standards (eg sets of resource elements) with zero transmit power. This fact is described in more detail later with reference to FIG. 7. These patterns are signaled to the user equipment through squelch patterns and these indicate which of the resource elements will be left empty by the eNodeB during data transmission in PDSCH. This allows for a potentially future proof CSI-RS design, so that a Rei. 11 UE can, e.g. measure CSI-RS from multiple cells simultaneously without PDSCH interference (a feature not yet included in LTE Ver-10).
    An example of a network mobilization scenario of interest in the present case is described in FIG. 4. Within the coverage area 400 of an eNodeB 12 macro with eg. antennas 4 TX 12E, there are a total of four hotspots 410-1 to 410-4 created by four transmit points 130-1 to 130-4, each having some transmit antennas (1, 2, 4 or 8) 130E and a respective number (1, 2, 4 or 8) of CSI-RS antenna ports.
    The transmission points 130 may or may not have the same cell ID (identification) as the macro transmission point 12.
    In the conventional heterogeneous networking scenario, the transmission points 130 are independent cells, each having a distinct cell ID.
    In the case of single cell COMP, multiple transmission points/nodes, such as the implemented transmission points 130, e.g. through Remote Radio Heads (RRHs) as well as the eNodeB 12 macro, possibly with different transmit powers, share the same physical cell ID and are only distinguished by the UE through different CSI-RS.
    In both of the above scenarios, a constant monitoring and recording of channel status information (CSI) for all CSI-RS antenna ports configured for all transmission points/nodes would dramatically increase the measurement overhead and information registration overhead for the UE and therefore, from a network point of view, the UL control channel overhead. Therefore, it is advantageous that the UE only regularly registers the CSI for the macro eNodeB 12 and the transmission points 130 which, e.g. are closest to user equipment or have the best signal quality and use only this subset of transmit points in the CSI register and related DL COMP operations (which are referred to in the 3GPP community as "DL COMP collaboration set") for the user equipment. user.
    An example problem, therefore, is how eNodeB/network and UE determine which transmit points (eNB 12 and transmit points 130) from a set of configured CSI-RS antenna ports should be included in the regular CSI and channel quality reports (CQI) and DL COMP operations. Consequently, one issue to resolve is how the network/eNodeB and UE "know" and define the CSI-RS antenna ports that the UE should regularly monitor, use to create CSI measurements and report back to the network.
    The present invention proposes a solution to this problem based on an example realization on the CSI-RS antenna port information available at the UE. An example embodiment uses the "zero power CSI-RS bitmap", also called the CSI-RS squelch standard in the present publication, as well as the configured EU-specific reference signal ports. Regarding the zero power CSI-RS standard, see section 6.10.5 in 3GPP TS 36.21 1, project aOO for version 10.0.0, Dec. 2010. The CSI-RS squelch standard may indicate the CSI-RS standards that are configured within the area of interest (multiple transmission points (RRHs) 130 with the same cell ID and/or some neighboring cells, see FIG. 4). This squelch pattern includes 16 bits, so that the user equipment knows which modulation symbols in addition to the configured UE specific CSI-RS ports have to be repaired from PDSCH in the PDSCH decoding process, when the PDSCH decoding process is used. 3GPP LTE DL 9 (TM9) transmission mode, which is based on using CSI-RS for channel status information and DM-RS for decoding received data. Each of the bits in the squelch pattern indicates four feature elements for up to four CSI-RS antenna ports configured within the area.
    It is useful to present a single example at this point. Assume (as shown in FIG. 4) the existence of a macro cell 400 and four hotspots 410-1 to 410-4, created by corresponding transmit points A 130-1 to D 130-4. Assume that the UE is connected to the macro cell 400/eNB 12 and is initially configured to use the macro cell's CSI-RS antenna ports (see CSI-RS configuration number (#) 5 in FIGs. 5 and 6 ) and each transmit point 130 is assigned a CSI-RS configuration, resulting in a corresponding squelch pattern for the UE. In the example shown in FIGs 5 and 6, the CSI-RS antenna ports of transmit point (PT) A 130-1 result in an entry at number two of the squelch pattern, transmit point 130-2 at number three, point of transmission C 130-3 at number 7 and transmission point D 130-4 at number 9 of FIG. 5. Although not shown in FIGs. 5 and 6, the respective configurations may further include possible entries of neighboring cell/eNodeB squelch patterns that are assigned to the UE 10 of interest using the CSI-RS 510 squelch pattern (shown in FIGS. 5 and 6).
    An example technique is to use the information contained in the squelch pattern 510 CSI-RS about the possible number of configured CSI-RS antenna ports available for DL COMP cooperation and their position in the time-frequency domain within the PDSCH area of the subframe. LTE DL (see FIG. 7) and ask the UE to measure the channel quality (eg signal strength) of all CSI-RS antenna port groups indicated by the CSI-RS 510 squelch standard in addition to the standards UE configured CSI-RS. For example, in the present example the UE is able to detect the CSI-RS from the transmission points B 130-2, C 130-3 and D 130-4, as indicated in FIGs. 5 and 6 and also the configured CSI-RS for the UE 10 (e.g. from macro cell 400, as indicated by the configured UE-specific CSI-RS report 515). Note that zeros can be used instead of ones to indicate which CSI-RS antenna posts are active.
    Note that FIG. 7 shows an example of how the CSI-RS squelch pattern 510 is mapped into a zero-power CSI-RS configuration (indicated by the numbered resource elements) in resource space 700. Resource space 700 in this example is a PDSCH area of a LTE DLsubframe. Each bit 710 in the CSI-RS squelch pattern 510 corresponds to a set 720 of four feature elements 730-1, 730-2, 730-3, 730-4 in feature space 700. A feature element 730 is an OFDM symbol that occurs at a specific time and on a particular subcarrier. See, for example. 3GPP TS 36.21 1 version 10.0.0 (Dec. 2010), chapter 6 and particularly 6.2.2 for a description of the PDSCH area of an LTE DLsubframe. The main purpose of the zero-power CSI-RS configuration is to avoid CSI-RS interference between neighboring cells. The zero power CSI-RS configuration also provides accurate intra-cell CSI measurement and ensures future CoMP performance. The zero power CSI-RS configuration depends on that of the CSI-RS with its own duty cycle and offset. Muting is always set to full bandwidth for all physical resource blocks (PRBs). The 16 bits 710 are used to indicate the resource elements that should be silenced and covers both common and TDD-only standards. Each bit corresponds to, eg. four feature elements following a standard CSI-RS 4Tx antenna port, i.e. the CSI-RS configuration for a cell or a transmission point (macro or hotspot) may need 2, 4 or 8 REs depending on the number of antennas. For four antennas, four REs are required. Since each bit in the squelch pattern corresponds to four REs, it was designed so that these four REs correspond to a possible CSI-RS 4Tx configuration in a neighboring cell or transmission point that belongs to the same logical cell. If two bits are "on" in the squelch pattern, they can pair two different CSI-RS 4Tx configurations (in neighboring cells or transmit points) or they can pair one CSI-RS 8Tx configuration in a neighboring cell/transmission point. In the example shown in FIG. 7, bit 710-3 corresponds to a set 720 with resource elements 730-1, 730-2, 730-3, and 730-4 at the indicated positions. Note that a set 720 may contain different resource element numbers,
    That is, the UE 10 in FIG. 4 determines, using the CSI-RS 510 squelch standard as well as the UE-specific CSI-RS 515 ports, which set 720 of resource elements 730 should be used to measure channel quality from other transmission points. The transmission point A 130-1 is configured to transmit its CSI reference signals in two reference symbols in the four resource elements 730-1 to 7304. The other transmission points B 103-2, C 130-3 and D 130-4 are also similarly configured to transmit CSI reference signals in their respective sets 720 of resource elements 730, as indicated in FIG. 7. The UE 10 performs channel quality measurements of these resource element sets 720, further including for the UE-configured CSI-RS antenna ports 515 (e.g., macro cell 400).
    Report 520 is then sent by UE 10 to eNodeB. The granularity of the 520-1 report can be the same as in the squelch bitmap, i.e. groups of four CSI-RS antenna ports as shown in FIG. 5. Alternatively, the 520-2 report may be based on a CSI-RS antenna port level granularity as is the case in FIG. 6. Based on the 520 report, the eNodeB is aware of the signal strength of the CSI-RS antenna port groups and therefore is able to configure the UE to use the best subset of the CSI-RS antenna ports (e.g. height antenna ports outside the combined antenna ports of the macro eNodeB cell and other transmission points) in a UE-specific manner for additional COMP or normal TM9 Rei 10 operation.
    The definition of the COMP collaboration set can be considered to be from the following example operations, as shown in FIG. 8.
    1. The eNodeB assigns the CSI-RS 510 squelch pattern as well as the UE 515 specific CSI-RS configuration to the UE.
    2. The eNodeB requests a report from the UE on the channel quality of the different sets of CSI-RS standards (corresponding to sets 720 indicated by the CSI-RS 510 squelch standard) and the UE-specific CSI-RS 515 antenna ports (e.g. . from the macro cell in the initial set search chaos COMP collaboration).
    3. The UE verifies the channel quality of the CSI-RS standard sets (each set comprising four CSI-RS standards/ports as indicated by the CSI-RS 510 squelch standard and UE-specific CSI-RS 515 antenna ports, as shown in Fig. 7).a. The definition of channel quality in this context may include, for example, the following:i Average received CSI-RS power by the standards/ports within the granularity of the report (eg one or four CSI-RS antenna ports) or alternatively , from the strongest/best pattern within the report's granularity set.ii. SINR (signal to interference plus noise ratio) average received by the standards/ports within the granularity of the report or, alternatively, the strongest/best standard within the granularity set of the report.iii. The projected data rate, assuming the respective antenna ports were used within the reporting granularity in the PDSCH data transmission (i.e. similar to the CQI definition in LTE). Alternatively, only the strongest antenna port within the reporting granularity can be taken into account.
    4. The UE communicates the measurement result to the eNodeB. Communication can be implemented using, e.g. Layer 1 (L1) signaling similar to CSI measurements or through MAC (media access control) procedures as is the case with, eg. RSRP/RSRQ measurements in LTE. Different granularities of communication and information can be considered for the report 520).i. A bitmap of the best CSI-RS sets is communicated back to the eNodeB (eg a subset of the CSI-RS standards, as indicated by the squelch pattern and the configured UE-specific CSI-RS antenna ports). This information only indicates the identity of the CSI-RS standard within the granularity of communication - but not the quality of the individual standard or set of CSI-RS standards.ii. Indication of the CSI-RS standards sets together with the relative quality of the channel compared to the strongest/best sets of the CSI-RS standards. For example, the UE can send an indication of the strongest/best sets of CSI-RS standards with four bits (one of 16 sets) and for each set of weakest CSI-RS standards, the UE indicates a relative performance/quality compared to that of the strongest set. The UE may also indicate the performance/quality corresponding to the strongest set of CSI-RS standards. This communication requires more signaling overhead, but provides better, more elaborate information for the eNodeB in selecting the COMP collaboration set for each specific UE. The eNodeB can provide certain measurement constraints to the UE in order to guide the UE as to how to build the final report 520.iii. Selection may be based on the N strongest/best sets of CSI-RS standards, depending on the granularity of related communication. The value of N can be set by the eNodeB by the higher layer signaling. Thus a UE will communicate exactly the strongest/best N set of CSI-RS.iv standards. The eNodeB guides the UE to account for a relative measurement of quality/performance compared to the CSI-RS best quality/performance standards. The UE therefore only communicates the CSI-RS standards sets (again depending on the communication granularity) satisfying this requirement (eg number of CSI-RS standards sets depending on this quality/performance difference).v . i. The eNodeB may also request the UE to communicate either in accordance with report (a) above (eg indicating only the best of the available sets of CSI-RS standards) or request better communication as described above.
    5. The eNodeB receives the 520 report from the UE and determines a UE-specific COMP collaboration set, i.e., the eNodeB decides which CSI-RS antenna ports are assigned by the transmit point for each specific UE to be monitored and provided to CSI information by the UE for DL operation in TM9 (including single cell COMP).
    6. The eNodeB informs the UE about the updated CSI-RS antenna ports that the UE should monitor accordingly and on what to base the UE operation and also the CSI information to be provided by the UE. Typically, the CSI-RS antenna ports would be limited to the specific ports that the UE is able to listen.
    7. The UE performs channel quality measurements based on the UE-specific CSI-RS configuration, in accordance with normal CSI-RS-based DL operation of eg. LTE
    Note that eNodeB may trigger the communication request in (2) to (4) regularly in order to keep the long-term record of the best possible COMP collaboration set for COMP operations with single cell ID.
    Turning to FIG. 9, a block diagram of an example method performed by a user equipment for the discovery of the reference signal port involving multiple transmission points is shown. In the examples of FIG. 9 and 10, the first transmission point is the eNodeB 12. However, it may be possible for other transmission points in a cell to perform these operations. At block 905, the user equipment receives an indication of a UE-specific reference signal pattern to be measured from a first transmission point in a cell. At block 910 the user equipment receives information from the first transmission point in a cell. The information indicates sets of reference signal patterns, which sets of reference signal patterns have zero transmit power (eg as indicated by the CSI-RS squelch pattern) for certain frames of DL transmissions by the first transmission point. The complete set of reference signal patterns may correspond to one of one or more transmission point(s) in the cell or a neighboring cell.
    User equipment may or may not use the CSI-RS squelch standard for signal quality measurements. If user equipment must use the CSI-RS squelch standard to perform channel quality measurements, then user equipment must be informed of this. There are multiple options for this operation to take place.
    For example, at block 915, the user equipment optionally receives signals from the first transmission point of channel quality information to be communicated by the user equipment to the first transmission point. That is, the first transmission point indicates which of the scenarios in step 4 above should be used to communicate channel quality. Another option is illustrated by block 916, where user equipment receives signals from the first transmission point to perform channel quality measurements using the information (eg, the CSI-RS squelch pattern). Yet another option is illustrated by block 917, where the user equipment is configured (e.g. with original or updated software) to always perform channel quality measurements using the information (e.g. the CSI-RS squelch pattern ).
    Thus, at block 919, the user equipment determines whether to use the indicated sets of reference signal standards for channel quality measurements. Otherwise (block 919 = NO) the user equipment measures and communicates (block 919) the channel quality for the user equipment specific reference signal standard received in block 905.
    In block 920 (executed if block 919 = YES), based on the information received, the user equipment measures the channel quality for the indicated sets of reference signal patterns (received in block 910) and for the signal pattern specific EU reference (received in block 905).
    At block 930, the user equipment communicates indications of the measured channel quality for the indicated sets of reference signal patterns and the UE-specific reference signal pattern for the first transmission point. Note that the UE-specific reference signal pattern can be transmitted separately. These indications are in accordance with the signals received in block 915. In block 940 the user equipment receives indication signals from a specific group of patterns. CSI-RS of the updated user equipment that it must measure and the channel quality information to be sent to the first transmission point.
    In FIG. 10 is shown a block diagram of an example method performed by a first transmission point (such as eNodeB 12) in a cell for discovering the reference signal port involving various transmission points within the cell. In block 1005, the first transmission point transmits an indication of a specific reference signal pattern from the UE to the UE. In block 1010 the first transmission point transmits information to a user equipment in a cell. The information indicates sets of reference signal patterns that have zero transmit power (eg as indicated by the CSI-RS squelch pattern) for certain DL transmission frames by the first transmit point. The complete set of reference signal patterns thus indicated may correspond to one of one or more transmission point(s) in the neighboring cell or cells.
    Thus, in block 1011, the transmit point determines whether user equipment should use the indicated sets of reference signal standards for channel quality measurements. Otherwise (block 101 1 = NO), in block 1019 the transmit point receives from the user equipment a report on the channel quality for the specific reference signal standard of the user equipment (corresponding to block 1005). In this case (block 1011=YES) the transmission point selects one of blocks 1015, 1016 or 1017.
    The transmit point, at block 1015, determines the channel quality information to be provided by the user equipment (see, e.g., step 4 above, with respect to FIG. 8) and signals this information to the user equipment. In block 1016 the transmit point determines that the user equipment is already configured to always perform channel quality measurements using the information transmitted in block 1010 and the transmit point takes no action.
    At block 1020, the user equipment communicates indications of the measured channel quality for the indicated sets of reference signal patterns and the UE-specific reference signal pattern for the first transmission point. The transmit point at block 1030 determines a specific group of CSI-RS standards of user equipment updated to the UE. In block 1050, the transmit point signals indications of the specific group of CSI-RS standards of updated user equipment.
    Without limiting in any way the scope, interpretation or application of the claims below, a technical effect of one or more of the example embodiments presented is the use of information, such as a standard such as the CSI-RS standard, to indicate to the equipment of a user which sets of CSI-RS standards should be subjected to a channel quality measurement and have the user equipment inform a transmission point of the results of the channel quality measurements.
    Embodiments of the present invention may be implemented in software, hardware, application logic, or a combination of software, hardware, and application logic. In an exemplary embodiment, application logic, software, or a set of instructions is maintained in any one or more conventional computer readable media. In the context of this document, a "computer-readable medium"1 may be any medium or mediums that can contain, store, communicate, propagate or transport instructions for use by or associated with a system, apparatus or instruction-executing device, such as a computer, with an example of a computer described and illustrated, e.g., in Figure 1. A computer readable medium may comprise a computer readable storage medium which may be any medium or mediums which can contain or store instructions for use or associated with an instruction-executing system, apparatus or device such as a computer.
    If desired, the different functions discussed herein may be performed in a different order and/or simultaneously. Furthermore, if desired, one or more of the functions described above may be optional or may be combined.
    While various aspects of the invention are set out in the independent claims, other aspects of the invention include other combinations of features of the described embodiments and/or dependent claims with the features of the independent claims, and not just the combinations explicitly set out in the claims.
    It is also noted that while the foregoing describes exemplary embodiments of the invention, these descriptions should not be construed as restrictive. On the contrary, there are various variations and modifications that can be made without departing from the scope of the present invention as defined in the appended claims.
    权利要求:
    Claims (25)
    [0001]
    1. Method characterized by comprising: in a user equipment (10), receiving information indicating multiple sets of reference signal patterns from a transmission point (12, 130, 130-1, 130-2, 1303 , 130-4) for measuring the channel quality for the transmission point (12, 130, 130-1, 130-2, 130-3, 130-4), wherein the multiple sets of reference signal patterns comprise one or more squelch reference signal patterns that signal which reference signal patterns are selected from the multiple sets of reference signal patterns to communicate the channel quality measurement to the transmit point (12, 130, 130- 1, 130-2, 130-3, 1304); and the one or more squelch reference signal patterns have zero transmit power for certain transmissions frames by the transmit point (12, 130, 130-1, 130-2, 130-3, 130-4); quality measurement from the channel to the transmit point (12, 130, 130-1, 130-2, 130-3, 130-4) over the selected reference signal patterns from the indicated multiple sets of reference signal patterns to the transmit point. transmission (12, 130, 130-1, 130-2, 130-3, 130-4) based on one or more squelch reference signal patterns from the transmission point (12, 130, 130-1, 130 -2, 130-3, 130-4); ecommunication to the transmission point (12, 130, 130-1, 130-2, 130-3, 130-4) of channel quality indications measured only through the reference signal standards selected for the transmission point ( 12, 130, 130-1, 130-2, 130-3, 130-4).
    [0002]
    Method according to claim 1, characterized in that the information comprises a pattern of bits, each bit indicating a set of reference signal patterns that are to be measured for channel quality.
    [0003]
    Method according to claim 2, characterized in that the pattern comprises a zero power channel state information - reference signal bitmap.
    [0004]
    A method as claimed in claim 1, wherein: the method further includes receiving an indication of a user equipment specific reference signal pattern that is to be measured for signal quality; the measurement further comprises measuring the user equipment specific reference signal pattern for channel quality; and the communication further comprises communicating both the measured channel quality for the multiple of the indicated sets of reference signal patterns and for the specific reference signal pattern of the user equipment.
    [0005]
    A method as claimed in claim 1, characterized in that the measured channel quality communication indications further comprise communication for at least one of the indicated multiple sets of reference signal patterns if a corresponding measured channel quality reaches the pre-threshold. -determined.
    [0006]
    A method according to claim 1, characterized in that the measurement further comprises measuring at least one of the indicated multiple sets of reference signal patterns, channel quality for a plurality of transmission points (12, 130, 130). -1, 130-2, 130-3, 130-4); and the communication further comprises communicating to at least one of the indicated multiple sets of reference signal patterns and a corresponding plurality of transmission points (12, 130, 130-1, 130-2, 130-3, 130-4) if a corresponding measured channel quality reaches the predetermined threshold.
    [0007]
    Method according to claim 1, characterized in that the measurement is performed in response to a channel status information - reference signal report request message.
    [0008]
    Method according to claim 1, characterized in that the communication is performed using a channel status information - reference signal quality report message.
    [0009]
    Method according to claim 1, characterized in that: the transmission point (12, 130, 130-1, 130-2, 130-3, 130-4) is in a cell (400, 410-1, 410 -2, 410-3, 410-4); at least one of a plurality of other transmission points (12, 130, 130-1, 130-2, 130-3, 130-4) is in the cell (400, 410-1, 410-2, 410-3, 410-4); and at least one additional transmission point of the plurality of other transmission points (12, 130, 130-1, 130-2, 130-3, 130-4) is in one or more neighboring cells (400, 410-1, 410-2, 410-3, 410-4).
    [0010]
    Method according to claim 1, characterized in that the channel quality measurement is performed in response to signals from the transmission point (12, 130, 130-1, 130-2, 130-2, 130-3, 130). -4) indicating the indicated multiple sets of reference signal standards that should be measured for signal quality.
    [0011]
    Method according to claim 1, characterized in that reception, measurement and communication are performed by the user equipment (10) and wherein the signal quality measurement is performed in response to the internal configuration of the user equipment (10) , indicating the indicated multiple sets of reference signal patterns that are to be measured for signal quality.
    [0012]
    12. Apparatus (10) comprising: one or more processors configured to cause the apparatus to perform at least the following: receiving information indicative of multiple sets of reference signal patterns from a transmission point (12, 130, 130-1, 130-2, 1303, 130-4) for measuring the channel quality for the transmission point (12, 130, 130-1, 130-2, 130-3, 130-4), in that the multiple sets of reference signal patterns comprise one or more squelch reference signal patterns that signal which reference signal patterns are selected from the multiple sets of reference signal patterns to communicate the channel quality measurement to the transmit point (12, 130, 130-1, 130-2, 130-3, 1304), wherein the one or more squelch reference signal patterns have zero transmit power for certain transmission frames by the transmit point (12, 130, 130-1, 130-2, 130-3, 130-4); measurement channel quality for the transmission point (12, 130, 130-1, 130-2, 130-3, 130-4) over selected reference signal patterns from the indicated multiple sets of reference signal patterns for the transmission point (12, 130, 130-1, 130-2, 130-3, 130-4) based on one or more squelch reference signal patterns from the transmission point (12, 130, 130-1 , 130-2, 130-3, 130-4); ecommunication to the transmission point (12, 130, 130-1, 130-2, 130-3, 130-4) of channel quality indications measured only over the reference signal standards selected for the transmission point (12 , 130, 130-1, 130-2, 130-3, 130-4).
    [0013]
    Apparatus as claimed in claim 12, characterized in that the information comprises a pattern of bits, each bit indicating a set of reference signal patterns that are to be measured for channel quality.
    [0014]
    Apparatus according to claim 13, characterized in that the pattern comprises a zero power channel state information - reference signal bitmap.
    [0015]
    Apparatus according to claim 12, characterized in that: the at least one processor is configured also to cause the apparatus to perform at least the following: receiving an indication of a specific reference signal pattern from the user equipment that shall be measured for channel quality; measurement further comprises measuring the user equipment specific reference signal standard for channel quality, and communication further comprising communicating both the measured channel quality for the multiple sets indicated of reference signal patterns and to the specific reference signal pattern of the user equipment.
    [0016]
    16. Method characterized by comprising: in a network device (12, 130, 130-1, 130-2, 130-3, 130-4), transmitting indicator information of multiple sets of reference signal patterns from a transmission point (12, 130, 130-1, 130-2, 1303, 130-4) to a user equipment (10), wherein the multiple sets of reference signal patterns comprise one or more signal patterns squelch reference signals that signal to user equipment (10) which reference signal patterns are selected from the multiple sets of reference signal patterns for communicating the channel quality measurement to the transmission point (12, 130, 130-1, 130-2, 130-3, 130-4), and the one or more squelch reference signal patterns have zero transmit power for certain transmissions frames by the transmit point (12, 130, 1301, 130 -2, 130-3, 130-4); and reception, from user equipment (10), of channel quality indications to the transmission point (12, 130, 130-1, 130-2, 130-3, 1304) that are measured only against selected standards signal from the indicated multiple sets of reference signal patterns from the transfer point (12, 130, 130-1, 130-2, 130-3, 130-4).
    [0017]
    A method as claimed in claim 16, further including: determining a user equipment specific set of reference signal patterns that the user equipment (10) should measure and signaling an indication to the user equipment (10) of the user equipment specific determined set of reference signal patterns that the user equipment (10) is to measure.
    [0018]
    A method as claimed in claim 16, further including: determining the channel quality information to be provided by the user equipment (10) to the transmission point (12, 130, 130-1, 130-2, 130-3, 130-4) for the measured channel quality, signaling indications of the determined channel quality information to the user equipment (10).
    [0019]
    Method according to claim 16, characterized in that it further includes sending a channel status information message - reference signal report request to the user equipment (10) to request the user equipment (10) to measure the channel quality.
    [0020]
    Method according to claim 16, characterized in that the reception comprises receiving channel status information - reference signal quality report message.
    [0021]
    Method according to claim 16, characterized in that: the transmission point (12, 130, 130-1, 130-2, 130-3, 130-4) is in a cell (400, 410-1, 410 -2, 410-3, 410-4); at least one of a plurality of other transmission points (12, 130, 130-1, 130-2, 130-3, 130-4) is in the cell (400, 410-1, 410-2, 410-3, 410-4); and at least one additional transmission point of the plurality of other transmission points (12, 130, 130-1, 130-2, 130-3, 130-4) is in one or more neighboring cells (400, 410-1, 410-2, 410-3, 410-4).
    [0022]
    A method as claimed in claim 16, further comprising, prior to reception, signaling to the user equipment (10) an indication that the multiple sets of reference signal patterns are to be measured for signal quality. .
    [0023]
    23. Apparatus (12), characterized in that it comprises: one or more processors configured to cause the apparatus to perform at least the following: transmitting information indicating multiple sets of reference signal patterns from a transmission point (12 , 130, 130-1, 130-2, 1303, 130-4) to a user equipment (10), wherein the multiple sets of reference signal patterns comprise one or more squelch reference signal patterns that signal to the user equipment (10) which reference signal patterns are selected from multiple sets of reference signal patterns for communicating the channel quality measurement to the transmission point (12, 130, 130-1, 130- 2, 130-3, 130-4), wherein the one or more squelch reference signal patterns have zero transmit power for certain transmissions frames by the transmit point (12, 130, 130-1, 130-2, 130-3, 130-4); and reception, from user equipment (10), of channel quality indications to the transmission point (12, 130, 130-1, 130-2, 130-3, 1304) that are measured only against selected standards signal from the indicated multiple sets of reference signal patterns from the transfer point (12, 130, 130-1, 130-2, 130-3, 130-4).
    [0024]
    Apparatus as claimed in claim 23, characterized in that the at least one processor is also configured to cause the apparatus to perform at least the following: determining a user equipment specific set of reference signal patterns that the equipment (10) must measure and signal an indication to the user equipment (10) of the user equipment-specific determined set of reference signal standards that the user equipment (10) must measure.
    [0025]
    Apparatus as claimed in claim 23, characterized in that the at least one processor is also configured to cause the apparatus to perform at least the following: determining the channel quality information to be provided by the user equipment (10) to the transmit point (12, 130, 130-1, 130-2, 130-3, 130-4) for the measured channel quality, and signaling indications of the determined channel quality information to the user equipment (10 ).
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    同族专利:
    公开号 | 公开日
    EP2695418A1|2014-02-12|
    US8599711B2|2013-12-03|
    US20120257515A1|2012-10-11|
    CN103597870B|2018-03-20|
    RU2013148161A|2015-05-20|
    KR20150124453A|2015-11-05|
    CN103597870A|2014-02-19|
    PL2695418T3|2020-03-31|
    JP2014514837A|2014-06-19|
    EP2695418B1|2019-09-11|
    US9025487B2|2015-05-05|
    JP2015216689A|2015-12-03|
    PT2695418T|2019-11-25|
    US20140036713A1|2014-02-06|
    KR20140006056A|2014-01-15|
    ES2755724T3|2020-04-23|
    SG193333A1|2013-10-30|
    WO2012136846A1|2012-10-11|
    BR112013025961A2|2016-12-20|
    JP6208176B2|2017-10-04|
    RU2564522C2|2015-10-10|
    JP2018023130A|2018-02-08|
    JP5789042B2|2015-10-07|
    KR20160130535A|2016-11-11|
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    法律状态:
    2017-10-24| B25D| Requested change of name of applicant approved|Owner name: NOKIA SOLUTIONS AND NETWORKS OY (FI) |
    2018-12-18| B06F| Objections, documents and/or translations needed after an examination request according [chapter 6.6 patent gazette]|
    2020-04-14| B06U| Preliminary requirement: requests with searches performed by other patent offices: procedure suspended [chapter 6.21 patent gazette]|
    2021-11-03| B09A| Decision: intention to grant [chapter 9.1 patent gazette]|
    2022-01-04| B16A| Patent or certificate of addition of invention granted [chapter 16.1 patent gazette]|Free format text: PRAZO DE VALIDADE: 20 (VINTE) ANOS CONTADOS A PARTIR DE 10/04/2012, OBSERVADAS AS CONDICOES LEGAIS. |
    优先权:
    申请号 | 申请日 | 专利标题
    US13/066,227|US8599711B2|2011-04-08|2011-04-08|Reference signal port discovery involving transmission points|
    US13/066,227|2011-04-08|
    PCT/EP2012/056452|WO2012136846A1|2011-04-08|2012-04-10|Reference signal port discovery involving transmission points|
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