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    • 专利摘要:
    RS-UE SEQUENCE INITIALIZATION FOR WIRELESS COMMUNICATION SYSTEMS. Pseudo-random sequences among a plurality of RS-UEs for use by a plurality of UEs are initialization, the initialization of each pseudo_random sequence associated with each RS-UE being independent of a UE-specific identifier and independent of a resource bandwidth assigned to a specific UE. Pseudo_random sequences of RSs-UE are generated. At least a part of the common resources for at least one UE among the plurality of UEs.
    公开号:BR112012007130B1
    申请号:R112012007130-0
    申请日:2010-09-30
    公开日:2021-05-25
    发明作者:Wanshi Chen；Juan Montojo；Tao Luo；Alexei Yurievitch Gorokhov；Aamod Dinkar Khandekar；Naga Bhushan；Amir Farajidana
    申请人:Qualcomm Incorporated；
    IPC主号:
    专利说明:

    Cross Reference
    [0001] The present application claims the benefits of US Provisional Patent Application No. 61/247,491 entitled "UE-RS SEQUENCE INITIALIZATION FOR REL-9 AND BEYOND," filed September 30, 2009 and US Provisional Patent Application No. 61/248,830, entitled "UE-RS SEQUENCE INITIALIZATION FOR REL-9 AND BEYOND," filed October 5, 2009, each of which is incorporated herein by reference in its entirety. Field of Invention
    [0002] The present description relates generally to wireless communications, and more specifically to reference signal sequence (RS) initialization for wireless communication systems. Description of Prior Art
    [0003] Wireless communication systems are widely developed to provide various types of communication content such as voice, data and so on. These systems may be multiple access systems capable of supporting communication with multiple users by sharing available system resources (eg bandwidth and transmission power). Examples of such multiple access systems include code division multiple access (CDMA), time division multiple access (TDMA) systems, frequency division multiple access (FDMA) systems, Long Term Evolution systems (LTE) 3GPP, and Orthogonal Frequency Division Multiple Access (OFDMA) systems.
    [0004] Generally, a wireless multiple access communication system can simultaneously support communication to multiple wireless terminals. Each terminal communicates with one or more base stations through forward and reverse link transmissions. The forward link (or downlink, DL) refers to the communication link from the base stations to the terminals, and the reverse link (or uplink, UL) refers to the communication link from the terminals to the base stations. This communication link can be established through a single-in, single-out, multiple-in, single-out, and multiple-in-multiple-output (MIMO) system.
    [0005] A MIMO system employs multiple transmit antennas (NT) and multiple receive antennas (NR) for data transmission. A MIMO channel formed by NT transmitting antennas and NR receiving antennas can be decomposed into NS independent channels, which are also referred to as spatial channels, where NS<min {NT, NR}. Each of the independent NS channels corresponds to a dimension. The MIMO system can provide improved performance (eg, greater throughput and/or greater reliability) if the additional dimensions created by multiple transmit and receive antennas are used.
    [0006] Additionally, multi-user MIMO systems (MU-MIMO) are provided that allow an access point (or other wireless device) to transmit simultaneously to multiple UEs (or other wireless devices) using MIMO over a single band frequency. In that regard, access points can transmit UE-specific RSs to the UEs for demodulating the data transmitted simultaneously into one or more signals in the frequency band. In LTE Version 8 (Rel-8) for single-layer beamforming, RS UE sequences are defined in terms of bandwidth of one or more resource blocks of a corresponding downlink transmission. Additionally, pseudo_random sequences for RS UE are generated according to a UE-specific identifier. Invention Summary
    [0007] A simplified summary is presented below in order to provide a basic understanding of some aspects of the aspects described. This summary is not an extensive overview and is not intended to identify key or critical elements or delineate the scope of such aspects. Its purpose is to present some concepts of the features described in a simplified way as an introduction to the more detailed description that will be presented later.
    [0008] According to one or more aspects and corresponding description thereof, various aspects are described regarding the assignment and initialization of RSs-UE sequences in the MU-MIMO settings.
    [0009] In certain respects, a method of data communication in a wireless communication system is provided. The method may comprise initializing pseudo_random sequences from a plurality of RS-UEs for use by a plurality of UEs, initializing each pseudo_random sequence associated with each RS-UE being independent of a specific UE identifier and independent of a width of resource bandwidth assigned to a specific UE. The method may further comprise generating pseudo_random sequences of the RS-UEs. The method may further comprise mapping at least one of the pseudo_random sequences to a portion of common resources for at least one UE among the plurality of UEs.
    [00010] In certain respects, a method of data communication in a wireless communication system is provided. The method may comprise receiving at least one pseudo_random sequence from an RS-UE, the at least one pseudo_random sequence having been initialized independently of a specific UE identifier and independently of a designated resource bandwidth for a specific UE. The method may further comprise receiving data on a downlink bandwidth resource. The method may further comprise using the RS-UE to decode the data received on the downlink bandwidth resource.
    [00011] In certain respects, an apparatus in a wireless communication network is provided. The apparatus may comprise at least one processor configured to initialize the pseudo_random sequences of a plurality of RS-UEs for use by a plurality of UEs, the initialization of each pseudo_random sequence associated with each RS-UE being independent of a UE-specific identifier and independent of a resource bandwidth assigned to a specific UE; generate pseudo_random sequences of RSs-UE; and mapping at least one of the pseudo_random sequences to a part of the common resources for at least one UE among the plurality of UEs. The apparatus may further comprise a memory coupled to at least one processor.
    [00012] In certain respects, an apparatus in a wireless communication system is provided. The apparatus may comprise at least one processor configured to receive at least one pseudo_random sequence from an RS-UE, the at least one pseudo_random sequence having been initialized independently of a specific UE identifier and independently of a resource bandwidth assigned to the HUH; receiving data on a downlink bandwidth resource; and using RS-UE to decode the data received on the downlink bandwidth resource. The apparatus may further comprise a memory coupled to at least one processor.
    [00013] In certain respects, an apparatus in a wireless communication network is provided. The apparatus may comprise means for initializing the pseudo_random sequences of a plurality of RS-UEs for use by a plurality of UEs, the initialization of each pseudo_random sequence associated with each RS-UE being independent of a specific UE identifier and independent of a width of resource band assigned to a specific UE. The apparatus may further comprise means for mapping at least one of the pseudo_random sequences to a portion of the common resources for at least one UE among the plurality of UEs.
    [00014] In certain respects, an apparatus in a wireless communication system is provided. The apparatus may comprise means for receiving at least one pseudo_random sequence from an RS-UE, at least one pseudo_random sequence having been initialized independently of a specific UE identifier and independently of a resource bandwidth assigned to the UE. The apparatus may further comprise means for receiving data on a downlink bandwidth resource. The apparatus may further comprise means for using the RS-UE to decode data received on the downlink bandwidth resource.
    [00015] In certain aspects, a computer-readable medium having computer-readable instructions stored thereon for execution by at least one processor to perform a method is provided. The method may comprise initializing pseudo_random sequences from a plurality of RS-UEs for use by a plurality of UEs, initializing each pseudo_random sequence associated with each RS-UE being independent of a UE-specific identifier and independent of a width of resource band assigned to a specific UE. The method may further comprise generating pseudo_random sequences of the RS-UEs. The method may further comprise mapping at least one of the pseudo_random sequences to a portion of common resources for at least one UE among the plurality of UEs.
    [00016] In certain aspects, a computer-readable medium having computer-readable instructions stored thereon for execution by at least one processor to perform a method is provided. The method may comprise receiving at least one pseudo_random sequence from an RS-UE, the at least one pseudo_random sequence having been initialized independently of a specific UE identifier and independently of a resource bandwidth assigned to the UE. The method may further comprise receiving data on a downlink bandwidth resource. The method may further comprise using RS-UE to decode data received on the downlink bandwidth resource.
    [00017] In order to accomplish the above purposes as well as others, one or more aspects comprise the characteristics fully described and particularly highlighted in the claims. The following description and the accompanying drawings present in detail certain illustrative aspects and are indicative of only a few of the various ways in which the principles of aspects may be employed. Other advantages and novelty features will become apparent from the detailed description below when considered in conjunction with the drawings and features described must include all said features and their equivalents. Brief Description of Drawings
    [00018] The characteristics, nature, and advantages of the present description will become more apparent from the detailed description presented below when taken into consideration in conjunction with the drawings where similar reference characters identify corresponding parts throughout all views and where:
    [00019] Figure 1 is a diagram illustrating a multiple access wireless communication system;
    [00020] Figure 2 is a block diagram illustrating a communication system;
    [00021] Figure 3 is a block diagram illustrating an illustrative system that facilitates the definition, initialization and mapping of RSs in MU-MIMO configurations;
    [00022] Figure 4 is a block diagram illustrating PUSCH assignments for various UEs in the MUMIMO configurations;
    [00023] Figure 5 is a flowchart illustrating an illustrative process for designating and initializing the sequences of RSs-UE in MU-MIMO configurations from a point of view of an access point;
    [00024] Figure 6 is a flowchart illustrating an illustrative process for receiving and using sequences of RSs-UE in MU-MIMO configurations from a UE point of view;
    [00025] Figure 7 is a block diagram illustrating an illustrative system that facilitates the definition, initialization and mapping of RSs in MU-MIMO configurations;
    [00026] Figure 8 is a flowchart illustrating an illustrative process for assigning and initializing sequences of RSs-UE in MU-MIMO configurations from a point of view of an access point;
    [00027] Figure 9 is a flowchart illustrating an illustrative process for receiving and using sequences of RSs-UE in MU-MIMO configurations from a UE point of view. Detailed Description of the Invention
    [00028] Various aspects are now described with reference to the drawings. In the following description, for the purpose of explanation, a number of specific details are presented in order to provide an in-depth understanding of one or more aspects. It may be evident, however, that the various aspects can be practiced without these specific details. In other cases, well-known structures and devices are illustrated in the form of a block diagram in order to facilitate the description of these aspects.
    [00029] The techniques described here can be used for various wireless communication networks, such as CDMA, TDMA, FDMA, OFDMA, single-carrier FDMA networks (SC-FDMA), etc. The terms "networks" and "systems" are often used interchangeably. A CDMA network may implement a radio technology such as Universal Terrestrial Radio Access (UTRA), cdma2000, etc. UTRA includes Broadband CDMA (W-CDMA), and Low Chip Rate (LCR). cdma2000 covers IS-2000, IS-95 and IS-856 standards. A TDMA network can implement a radio technology such as a Global System for Mobile Communications (GSM). An OFDMA network can implement a radio technology such as Evolved UTRA (E-UTRA), IEEE 802.11, IEEE 802.16, IEEE 802.20, Flash-OFDM®, etc. UTRA, E-UTRA, and GSM are part of the Universal Mobile Telecommunication System (UMTS). LTE is a future version of UMTS that uses E-UTRA. UTRA, E-UTRA, GSM, UMTS and LTE are described in documents from an organization called the "3rd Generation Partnership Project" (3GPP). cdma2000 is described in documents from an organization called the "3rd Generation 2 Partnership Project" (3GPP2). These various radio technologies and standards are known in the art. For the sake of clarity, certain illustrative aspects of the techniques are described below for LTE, LTE terminology is used in much of the description below.
    [00030] SC-FDMA using single carrier modulation and frequency domain equalization is a technique. SC-FDMA has similar performance and essentially the same overall complexity as the OFDMA system. The SC-FDMA signal has a lower peak-to-average power ratio (PAPR) due to its inherent single-carrier structure. SC-FDMA has drawn a lot of attention, especially in uplink communications where lower PAPR greatly benefits the mobile terminal in terms of transmission power efficiency. It is currently an ongoing consideration for the uplink multiple access scheme in LTE 3GPP, or E-UTRA.
    [00031] Referring to Fig. 1, a multiple access wireless communication system according to an embodiment is illustrated. An access point 100 (AP) includes multiple antenna groups, one including 104 and 106, another including 108 and 110, and an additional one including 112 and 114. In Figure 1, only two antennas are illustrated for each antenna group, in Figure 1 . However, more or less antennas can be used for each antenna group. Access terminal 116 (AT) is in communication with antennas 112 and 114, where antennas 112 and 114 transmit information to access terminal 116 over forward link 120 and receive information from access terminal 116 over reverse link 118 Access terminal 122 is in communication with antennas 106 and 108, where antennas 106 and 108 transmit information to access terminal 122 over forward link 126 and receive information from access terminal 122 over reverse link 124. In an FDD system, the communication links 118, 120, 124 and 126 can use different frequencies for communication. For example, forward link 120 may use a different frequency than that used by reverse link 118.
    [00032] Each antenna group and/or the area in which they must communicate is often referred to as an access point sector. In the modality, the antenna groups are each designated to communicate with the access terminals in a sector of the areas covered by the access point 100.
    [00033] In communication through the forward links 120 and 126, the transmitting antennas of the access point 100 use beamforming in order to improve the signal-to-noise ratio of the forward links to the different access terminals 116 and 122. Furthermore, an access point using beamforming to transmit to access terminals spread randomly across its coverage causes less interference to access terminals in neighboring cells than an access point transmitting through a single antenna to all your access terminals.
    [00034] An access point may be a fixed station used to communicate with terminals and may also be referred to as an access point, a Node B, an evolved Node B (eNB), or some other terminology. An access terminal may also be called an access terminal, UE, wireless communication device, terminal, access terminal or some other terminology. Furthermore, an access point can be a macro cell access point, a femto cell access point, a pico cell access point, and/or the like.
    [00035] Additionally, as described, the access point 100 can communicate with the access terminals 116 and 122 using MIMO, single-user MIMO (SU-MIMO), MU-MIMO, and/or the like. In that regard, the access point 100 may transmit RSs to the access terminals 116 and 122 which may be used to demodulate subsequent signals sent from the access point 100. In one example, the RSs may be UE specific. In one example, RSs for access terminals 116 and 122 (and/or additional access terminals communicating with access point 100) may be CDM, FDM and/or a combination of CDM and FDM to facilitate diversity.
    [00036] Figure 2 is a block diagram of a modality of a transmitting system 210 (may be an access point or access terminal) and a receiving system 250 (may be an access terminal or access point) in a MIMO system 200. In the transmitter system 210, traffic data for various data streams is provided from a data source 212 to a transmission data processor (TX) 214.
    [00037] In one mode, each data stream is transmitted through a respective transmit antenna. The TX data processor 214 formats, encodes and interleaves the traffic data for each data stream based on a particular encoding scheme selected for that data stream to provide encoded data.
    [00038] The encoded data for each data stream can be multiplexed with pilot data using OFDM techniques. Pilot data is typically a known data pattern that is processed in a known way and can be used in the receiving system to estimate the channel response. The multiplexed pilot and coded data for each data sequence is then modulated (ie, symbol-mapped) based on a particular modulation scheme (eg, BPSK, QSPK, M-PSK or M-QAM) selected for that sequence. to provide modulation symbols. The data rate, encoding, and modulation for each data stream can be determined by instructions performed by processor 230.
    [00039] The modulation symbols for all sequences are then provided to a MIMO TX 220 processor, which can further process the modulation symbols (eg for OFDM). The MIMO processor TX 220 then provides NT modulation symbol sequences to NT transmitters (TMTR) 222a through 222t. In certain embodiments, MIMO processor TX 220 applies beamforming weights to the data stream symbols and the antenna from which the symbol is being transmitted.
    [00040] Each transmitter 222 receives and processes a respective symbol sequence to provide one or more analog signals, and further conditions (e.g., amplifies, filters, and upconverts) the analog signals to provide a modulated signal suitable for transmission over the channel. PIM. NT modulated signals from transmitters 222a to 222t are then transmitted from NT antennas 224a to 224t, respectively.
    [00041] In the receiving system 250, the transmitted modulated signals are received by NR antennas 252a to 252r and the signal received from each antenna 252 is provided to a respective receiver (RCVR) 254a to 254r. Each receiver 254 conditions (e.g., filters, amplifies, and downconverts) a respective received signal, digitizes the conditioned signal to provide samples, and further processes the samples to provide a corresponding "received" symbol sequence.
    [00042] An RX data processor 260 then receives and processes the NR symbol sequences received from NR receivers 254 based on a particular receiver processing technique to provide NT "detected" symbol sequences. RX data processor 260 then demodulates, deinterleaves, and decodes each detected symbol sequence to retrieve traffic data for the data sequence. The processing by the RX data processor 260 is complementary to that performed by the MIMO processor TX 220 and the TX data processor 214 in the transmitter system 210.
    [00043] A processor 270 periodically determines which precoding array to use (discussed below). Processor 270 formulates a reverse link message comprising an array index part and a rank value part.
    [00044] The reverse link message can comprise various types of information regarding the communication link and/or the received data sequence. The reverse link message is then processed by a TX data processor 238, which also receives traffic data for various data streams from a data source 236, modulated by a modulator 280, conditioned by transmitters 254a to 254r, and transmitted back to the transmitter system 210.
    [00045] In the transmitter system 210, the modulated signals from the receiver system 250 are received by the antennas 224, conditioned by the receivers 222, demodulated by a demodulator 240, and processed by an RX data processor 242 to extract the reverse link message transmitted by the receiving system 250. Processor 230 then determines which precoding matrix to use to determine the beamforming weights and then processes the extracted message.
    [00046] In one aspect, logical channels are classified into Control Channels and Traffic Channels. The Logical Control Channels comprise the Broadcast Control Channel (BCCH), which is the DL channel for broadcasting system control information. The Paging Control Channel (PCCH) which is the DL channel that transfers paging information. The Multicast Control Channel (MCCH) which is a point-to-multipoint DL channel used for transmitting Multimedia Multicast Service (MBMS) scheduling and control information for one or several MBMS Traffic Channels (MTCHs) ). Generally, after establishing a Radio Resource Control (RRC) connection this channel is only used by UEs receiving MBMS (Note: old MCCH + MSCH). The Dedicated Control Channel (DCCH) is a point-to-point bidirectional channel that transmits dedicated control information and is used by UEs having an RRC connection. In the aspect, the Logical Traffic Channels comprise a Dedicated Traffic Channel (DTCH) which is a point-to-point bidirectional channel, dedicated to a UE, for the transfer of user information. In addition, a Multicast Traffic Channel (MTCH) is a point-to-multiple DL channel for transmitting traffic data.
    [00047] In one aspect, Transport Channels are classified into DL and UL. DL Transport Channels comprise a Broadcast Channel (BCH), Downlink Shared Data Channel (DL-SDCH) and a Paging Channel (PCH), the PCH to support UE power saving (DRX cycle is indicated by network to the UE), broadcast across the entire cell and mapped to PHY resources that can be used for other control/traffic channels. UL Transport Channels comprise a Random Access Channel (RACH), a Request Channel (REQCH), an Uplink Shared Data Channel (UL-SDCH) and a plurality of PHY channels. PHY channels comprise a set of DL channels and UL channels.
    [00048] PHY DL channels comprise: Physical Downlink Shared Channel (PDSCH), Physical Broadcast Channel (PBSH), Physical Multicast Channel (PMCH), Physical Downlink Control Channel (PDCCH), Indicator Channel Physical Hybrid Automatic Repeat Request (PHICH), and Physical Control Format Indicator Channel (PCFICH).
    [00049] PHY UL Channels comprise: Physical Random Access Channel (PRACH), Physical Uplink Shared Channel (PUSCH), and Physical Uplink Control Channel (PUCCH).
    [00050] In one aspect, a channel structure is provided and preserves low PAR properties (at any given time, the channel is contiguous or evenly spaced in frequency) of a single-carrier waveform.
    [00051] For the purposes of this document, the following abbreviations apply:



    [00052] Figure 3 illustrates an illustrative system 300 that facilitates the generation of RSs-UE and related resource mappings in a MU-MIMO configuration. System 300 includes an access point 302 which may be a base station, a femto cell access point, a pico cell access point, a relay node, a mobile base station, a mobile device operating in a communication mode. peer-to-peer, and/or the like, for example, that provides wireless device 304 with access to a wireless network. Wireless device 304 may be a UE such as a mobile device, a part thereof, or substantially any device that can access a wireless network.
    [00053] The access point 302 may include an RS-UE 306 sequence definition component that develops a plurality of reference signals that can be used by one or more UEs to decode data through shared resources, an initialization component of RS-UE sequence 308 that creates a pseudo_random sequence of the reference signals for the one or more UEs, an RS-UE mapping component 310 that maps a UE to a given pseudo_random sequence of the RSs-UEs, and a signaling component of RS information 312 that communicates RS-UE mapping information to a corresponding UE. Wireless device 304 may include an RS information receiving component 2314 that obtains one or more parameters related to RS transmissions from an access point and an RS 316 decoding component that decodes one or more RSs based on at least part in the parameters.
    [00054] According to an example, as described, RSs in a MU-MIMO configuration can be CDM, FDM and/or a combination thereof. For example, where Rss are CDM, the access point 302 can multiplex RSs according to selected pseudo_random sequences for one or more wireless devices. In one example, the RS-UE sequence definition component 306 can generate a plurality of Rss-UEs that can be used to decode the data sent over shared resources to one or more UEs. In the MU-MIMO configuration, it should be appreciated that devices having shared bandwidth assignments and/or location assignments may not be fully aligned. In this way, the RS-UE sequence definition component 306 can generate the plurality of RSs-UEs based on an entire bandwidth of a related cell rather than based on PDSCH bandwidth (as in LTE version 8) . In another aspect (e.g., to support multi-cell MU-MIMO), the RS-UE sequence definition component 306 can generate RS-UEs in a bandwidth-agnostic manner, such as according to a width configuration of higher downlink bandwidth in terms of RBs.
    [00055] Once the RS-UEs are defined, the RS-UE sequence initialization component 308 can generate pseudo_random sequences of the RS-UE to assign to the UEs the decoding of the shared resources. In MU-MIMO configurations, it may be desirable for the antenna ports for wireless devices paired to use the same PDSCH resources to remain orthogonal. To that end, the RS-UE sequence initialization component 308 can initialize the RS-UE sequences based at least in part on a cell identifier (as opposed to a UE identifier in LTE Version 8). This can ensure orthogonality as the antenna ports use the common metric. In that regard, for example, other common metrics may be used, such as resource block identifier, antenna port index, and/or the like, which may be known from both antenna ports. The RS-UE mapping component 310 may assign pseudo_random sequences of the RS-UE and shared resource to one or more wireless devices using a predetermined mapping scheme that maintains orthogonality (e.g., sequentially from one end of the band, starting in the center of the band, etc.).
    [00056] In Figure 3, the RS information signaling component 312 can signal RS pseudo_random sequences, related resources, and/or related parameters corresponding to wireless device 304. In wireless device 304, RS information receiving component 314 can obtain the pseudo_random sequences received from RS, related shared resources and/or parameters from the access point 302. The RS 316 decoding component can decode specific RSs for the wireless device 304 from the access point 302 through shared resources using pseudo_random sequences, for example.
    [00057] In some communication systems, RS-UE is specified to support single-layer beamforming. For example, in LTE Rel-8 DL 7 transmission mode, the RS-UE sequence r(m) is defined by:
    where NPDSCHRB denotes the bandwidth in the resource blocks of the corresponding PDSCH transmission. The pseudo_random sequence c(i) can be predefined. The pseudo_random sequence generator can be initialized with:
    at the beginning of each subframe where nRNTI is defined, and can be a UE-specific ID.
    [00058] In other communication systems, dual sequence beamforming based on two RS-UE antenna ports is supported. For example, in LTE Rel-9, the following might be true: 1) The two antenna ports are CDM-ed; 2) Dynamic classification adaptation is supported: that is, a UE can be denoted as classification 1 or classification 2 DL transmission using layer 2 signaling (PDCCH). In the case of the classification 1 transmission, the UE is explicitly indicated on which antenna port should be used; 3) MU-MIMO is supported: that is, two UEs can be paired using the same PDSCH resources. Each UE is indicated over the antenna port in use, but it is not indicated whether it is in MU- or SU-MIMO transmission.
    [00059] For MU-MIMO operation, it is advantageous that the two RS-UE antenna ports for the paired UEs remain orthogonal after resource mapping using pseudo_random sequence and designated PDSCH resources. However, as can be seen from equation (1) above, if the sequence is initialized based on a specific UE ID, the generated sequences for the paired UEs are no longer the same. As a result, orthogonality may not be maintained. Additionally, one UE does not know the pseudo_random sequence used by the other paired UE, as the UE IDs may not be mutually known between the paired UEs. Such non-orthogonality and unknown information about other significant in the RS-UE.
    [00060] Another problem is that when the random sequence is generated depending on the designated PDSCH bandwidth (NPDSCHRB) and mapped to specific locations of the designated PDSCH resources, for example in (1), it is possible for the UEs to be paired in the MU transmissions -MIMO may not be completely aligned, both in terms of designated bandwidth and designated location, as illustrated in Figure 4. Turning to Figure 4, a first PDSCH 401 is illustrated that is assigned to a first UE and a second PDSCH 402 that is assigned to a second UE that is paired with the first UE. It is clear that the PDSCH bandwidths associated with the first and second PDSCHs 401, 402 are not aligned. In such a case, the pseudo_random sequences for the paired UEs may not be orthogonal.
    [00061] In view of the problems mentioned above, various RS-UE sequence initialization schemes are employed, where the initialization of each PR sequence associated with each RS-UE is independent of a specific UE identifier and independent of a bandwidth resource name for a specific UE.
    [00062] In one aspect, RS-UE sequence initialization can be performed independently of UE identifier in several different ways. In certain embodiments, this can be achieved simply by removing the UE identifier from initialization. That's it:

    [00063] Initialization is therefore independent of UE-specific IDs. In general terms, you can get:

    [00064] The sequence is still cell dependent and subframe dependent. Consequently, randomization of intercellular interference can still be performed.
    [00065] In some embodiments, RS-UE sequence initialization can be performed independently of a specific UE identifier by performing initialization as a function of a resource block identifier (RBID) and/or an antenna port index (AntPortIdx) expressed, respectively, as:
    •
    [00066] Although orthogonality may not be maintained for some of the cases, at least the sequence is known from paired UEs in MU-MIMO transmissions. RBID can be generated sequentially, or following a sequence-to-resource-specific mapping approach, (eg numbering starting from it and increasing up/down, similar to the common reference signal (CRS) case) .
    [00067] In some embodiments, RS-UE sequence initialization may be a function of a cyclic prefix (CP) type (ie, normal or extended cyclic prefix). For example, the function can be expressed as:

    [00068] In certain embodiments, different combinations of the above dependencies may be employed. For example, RS-UE sequence initialization can be a function of 1) RBID and AntPortIdx, 2) RBID and NCP, 3) AntPortIdx and NCP, or 4) RBID and AntPortIdx and NCP, etc.
    [00069] In another aspect, RS-UE random sequence generation can be performed so that paired UEs still have orthogonal RS-UE sequences, regardless of PDSCH resource allocations. This can be achieved, for example, by performing RS-UE sequence generation independently of a resource bandwidth assigned to a specific UE. In this way, the dependency on resource bandwidth is removed, thus mitigating the need for related UEs to be aligned when receiving RS-UE strings and related resource assignments. In certain embodiments, RS-UE sequence generation is based on the maximum possible bandwidth of a given cell, and mapped to the DL resources in some predetermined way (for example, sequentially from an edge of the band, or starting at from the center of the band, etc.). In other words, m=0, 1,...,12NDLRB-1, where m is defined in equation (1) above, and NDLRB notes a DL bandwidth of a specific cell in the wireless communication system.
    [00070] In view of the possible multi-cell MU-MIMO support, and the fact that the CRS is generated in a bandwidth agnostic manner in LTE Rel-8, the RS-UE sequence may be bandwidth agnostic also. That is, m = 0, 1,...12N[DL,max]RB-1, where NRB[DL, max] (may also be referred to as NRB[max,DL]) is a DL bandwidth setting maximum in terms of number of RBs, for example 110 RBs. The mapping of the generated RS-UE sequence to RS-UE resources can be the same as CRS (eg starting in the center, and mapping downwards or upwards so that the generated sequence mapping to the band is bandwidth agnostic ). To be more specific, the symbol mapped to(p)k,l=rl,n2(m'), where m' = m + Nmax,DLRB-NDLRB, and k has a step size of 6 resource elements (X 12 feature elements or RB size). Thus, m' varies from N[max,DL]RB-NDLRB to N[max,DL]RB + NDLRB-1. Note that RS-UE can be mapped based on RB, instead of based on 6 RBs as in the CRS case.
    [00071] Figure 5 is a flowchart illustrating an illustrative process 500 for assigning and initializing sequences of RSs-UE in MU-MIMO configurations from a point of view of an access point (for example, eNB). Process 500 starts at initial state 501 and proceeds to operation 510 where the PR sequences of the RS-UEs for use by a plurality of UEs are initialized, where the initialization of each PR sequence associated with each RS-UE is independent of an identifier. UE-specific and/or independent of a designated resource bandwidth for a specific UE.
    [00072] As described above, the first independence related to the initialization of sequence PR RS-UE can be achieved by removing the UE identifier from the initialization as defined by equation (3) above; and/or by performing initialization of a non-UE specific parameter function such as RBID, AntPortIdx, RBID, NCP, or any combinations thereof. The second independence regarding resource bandwidth can be achieved by initializing a plurality of RSs-UEs based at least in part on a bandwidth of a specific cell that includes the plurality of RSs-UEs. As described above, this removes the resource bandwidth dependency associated with the particular UE, which mitigates the need for related UEs to be aligned when receiving RS-UE strings and related resource assignments.
    [00073] Process 500 proceeds to operation 520 where the PR RS-UE sequences are generated using a procedure defined by equation (1), for example. PR sequences can be generated using common identifiers (non-UE specific), such as a cell identifier (NcellID), resource block identifier (RBID), etc., so that the cell antennas can retain the orthogonality of the sequence assignment for devices having similar designated resource.
    [00074] Process 500 proceeds to operation 530 where at least one of the PR RS-UE sequences generated in this way is mapped to a common resource portion for at least one UE among the plurality of UEs. This can be accomplished using a predetermined or known pattern to similarly ensure the required orthogonality. Process 500 then ends in final state 504.
    [00075] After mapping operation 530, an eNB sends the PR RS-UE sequences to a plurality of UEs in the cell. A particular UE among the plurality of UEs may receive PR sequences, extract a desired RS-UE for the particular UE, and use RS-UE for data decoding purposes.
    [00076] Figure 6 is a flowchart illustrating an illustrative process 600 for receiving and using PR sequences of RSs-UE in MU-MIMO configurations from a point of view of a UE. Process 600 starts at initial state 601 and proceeds to operation 610 where at least one PR sequence of an RS-UE is received by the UE where at least one PR sequence has been initialized independently of a specific UE identifier and/or independently of a resource bandwidth assigned to a specific UE.
    [00077] Process 600 proceeds to operation 620 where data is received by the UE on a DL bandwidth resource (eg PDSCH). Process 600 proceeds to operation 630 where data received on the downlink bandwidth resource is decoded by the UE using RS-UE. Process 600 ends in final state 640.
    [00078] In certain embodiments, as an extension of the embodiments described above, it is possible to apply RS-UE encryption based on group and PR sequence initialization. In such an embodiment, UEs are assigned to different groups in a semi-static or dynamic manner and, within each group, a procedure from among the various UE-independent RS-UE sequence and cryptographic initialization procedures described above can be applied.
    [00079] In one aspect, a group index indicative of a particular group to which a specific UE is assigned can be ported to the UE via L3 or L2 layer signaling, for example. As an example, if there are two groups, the group indices can be set to 0 and 1. A UE can be told which group index, 0 or 1, the UE belongs to. Group-based RS-UE sequence initialization enables non-orthogonal RS-UE MU-MIMO multiplexing when the total number of layers for UEs co-programmed in the MU-MIMO configuration is in excess of the number of orthogonal RS-UE ports. For example, in the context of LTE Rel. 9, one can consider groups of cryptographic sequences, say group A and group B. It is possible to orthogonally multiplex 2 UEs of group A (or group B), each one receiving rating 1. Additionally, it is possible to multiplex 2 UEs, each with rating 2, one from group A and one from group B, or 4 UEs, each with rating 1 transmission where 2 are from group A and 2 are from group B.
    [00080] Note that in this case the UEs can benefit from the potential optimization of the MU interference estimate within the group to which the UE is semi-statically or dynamically assigned. Furthermore, intergroup interference randomization can be performed in this way. Optimizations in the RS-UE encryption assignment for each group to reduce adverse impact across different groups can also be employed.
    [00081] In one aspect, an eNB may assign each UE a particular group from among the different groups based on one or more predetermined factors. For example, an assignment of a particular UE to a particular group may be based on a total number of UEs currently active in each group and/or on one or more UE parameters or attributes of the particular UE. For example, in a correlated antenna development, where channel directionality is slowly changing over time, UEs can be grouped based on their dominant channel directions so that UEs in different groups have dominant channel directions that are distant, or possibly orthogonal to each other.
    [00082] Figure 7 is a block diagram illustrating a 700 system that facilitates the generation of RS-UE and related resource mappings in a MU-MIMO configuration. System 700 includes an access point 702 which may be a base station, a femto cell access point, a pico cell access point, a relay node, a mobile base station, a mobile device operating in a communications mode. peer-to-peer, and/or the like, for example, that provides a 704 wireless device with access to a wireless network. Wireless device 704 can be a UE such as a mobile device, part thereof, or substantially any UE that can receive access to a wireless network.
    [00083] The access point 702 may include an RS-UE 706 sequence definition component that develops a plurality of reference signals that can be used by one or more UEs to decode data through shared resources, an initialization component RS-UE 708 sequence mapping that creates a pseudo_random sequence of the reference signals for one or more UEs, an RS-UE mapping component 710 that maps a UE to a given pseudo_random sequence of the RSs-UEs, a device grouping component 703 which designates UEs to which resources are assigned to one or more groups, and an information signaling component 705 which communicates RS-UE mapping and/or grouping information to one or more corresponding UEs. Wireless device 704 may include an RS 714 information receiving component that obtains one or more parameters related to RS transmissions from an access point and an RS 716 decoding component that decodes one or more RSs based on at least partly in the parameters.
    [00084] According to an example, as described above, RSs in a MU-MIMO configuration can be CDM, FDM and/or combinations thereof. For example, where RSs are CDM, access point 702 can multiplex Rss according to selected pseudo_random sequences for one or more wireless devices. In one example, the RS-UE sequence definition component 706 can generate a plurality of RS-UEs that can be used to decode the data sent over shared resources to one or more UEs. In MU-MIMO configurations, it should be appreciated that devices having shared bandwidth assignments and/or location assignments may not be fully aligned. In this way, the RS-UE sequence definition component 706 can generate the plurality of RSs-UEs based on an entire bandwidth of a related cell rather than based on the PDSCH bandwidth (as in LTE version 8) . In another example, (e.g., to support multi-cell MU-MIMO), the RS-UE sequence definition component 706 can generate RS-UEs in a bandwidth-agnostic manner, such as according to the width configuration of maximum possible downlink bandwidth in terms of RBs.
    [00085] Once RS-UEs are defined, RS-UE sequence initialization component 708 can generate RS-UE pseudo_random sequences to assign to UEs to decode the shared resources. In MU-MIMO configurations, it may be desirable that the antenna ports for wireless devices paired to use the same PDSCH resources remain orthogonal. To that end, the RS-UE sequence initialization component 708 can initialize the RS-UE sequences based at least in part on a cell identifier (as opposed to a UE identifier in LTE Rel-8). This can ensure orthogonality as antenna ports use common metric. In that regard, for example, other common metrics may be used, such as resource block identifier, antenna port index, and/or the like, which may be known from both antenna ports. The RS-UE mapping component 710 can assign the RS-UE pseudo_random sequences and shared resources to one or more wireless devices using a predetermined mapping scheme that maintains orthogonality (e.g., sequentially from one end of the band, starting in the center of the band, etc.).
    [00086] Device grouping component 703 may assign UE 704 to one or more groups (e.g., randomly, or based on a number of active UEs in a group, device parameters, and/or the like, as discussed above). In that regard, the RS-UE sequence initialization component 708 can initialize the RS-UE sequences for the wireless device 704 based on the designated group. Using group-based sequence initialization, in one example, can guarantee orthogonality between devices depending on a received classification. For example, if there are two RS-UE ports, where device grouping component 703 assigns wireless device 704 to a group and wireless device 704 is rated 1, RS-UE sequence initialization component 708 can boot the orthogonal strings for wireless device 704 and another device in the same group receiving rating 1. Similarly, where device grouping component 703 assigns wireless device 704 to a group and wireless device 704 is assigned rating 2 , the RS-UE 708 sequence initialization component can initialize the orthogonal sequences for the wireless device 704 and another device in a separate group receiving rating 2.
    [00087] Information signaling component 705 can signal pseudo_random sequences, related resources, and/or related parameters corresponding to wireless device 704. At UE 704, information receiving component RS 714 can obtain pseudo_random sequences, related shared resources and/or parameters of access point 702. RS decoding component 716 may decode specific RSs for wireless device 704 from access point 702 through shared resources using pseudo_random sequences, for example. Similarly, in one example, information signaling component 404 of access point 702 can transmit the bundle information to wireless device 704 (e.g., using L3 layer signaling).
    [00088] Figure 8 is a flowchart illustrating an illustrative process 800 for assigning and initializing sequences of RSs-UE in MU-MIMO configurations from a point of view of an access point (for example, eNB). Process 800 starts at initial state 801 and proceeds to operation 810 in which a plurality of UEs are assigned to different UE groups based on one or more predetermined factors. As described above, predetermined factors may include, but are not limited to, a total number of UEs currently active in each UE group, dominant channel directions of the UEs and/or locations of the UEs within a cell.
    [00089] Process 800 proceeds to operation 820 where the PR sequences of the RS-UEs for use by a plurality of UEs are initialized based on the designated UE groups. In particular, the initialization of each PR sequence associated with each RS-UE for a particular UE may be based on a group ID indicative of the UE group to which the particular UE was assigned. By way of example, in initialization operation 820, cinit is an initial value of a pseudo_random sequence generator associated with each RS-UE and is a defined function.
    where: NcellID is a cell ID; ns is a partition number; and n_groupID is a group ID.
    [00090] Additionally, in some embodiments, in initialization operation 820, the initialization of each PR sequence associated with each RS-UE is independent of a UE-specific identifier and/or independent of a resource bandwidth assigned to a UE specific. As discussed above, the first independence related to the initialization of the PR RS-UE sequence can be achieved by removing the UE identifier from the initialization as defined by equation (3) above; and/or by performing initialization of a function of non-UE specific attributes such as RBID, AntPortIdx, RBID, NCP or any combinations thereof. The second independence regarding resource bandwidth can be achieved by initializing a plurality of RSs-UEs based at least in part on a bandwidth of a specific cell that includes the plurality of RSs-UEs. As described above, this removes the dependency on resource bandwidth associated with the particular UE, which mitigates the need for related UEs to be aligned when receiving RS-UE strings and related resource assignments.
    [00091] Process 800 proceeds to operation 830 where the PR sequences of the RSs-UE are generated using a procedure defined by equation (1), for example. PR sequences can be generated using common (non-UE-specific) identifiers such as a cell identifier (NcellID), a resource block identifier (RBID), a group ID (n-groupID), etc. , so that cell antennas can retain the sequence designation orthogonality for devices having similar designated resources.
    [00092] Process 800 proceeds to operation 840 where at least one of the PR RS-UE sequences thus generated is mapped to a common resource portion for at least one UE among the plurality of UEs. This can be accomplished using a known or predetermined pattern to similarly ensure the required orthogonality. Process 800 ends in final state 850.
    [00093] Figure 9 is a flowchart illustrating an illustrative process 900 for receiving and using sequences of RSs-UE in MU-MIMO configurations from a point of view of a UE. Process 900 starts at initial state 901 and proceeds to operation 910 where at least one PR sequence of an RS-UE is received by a UE where the at least one PR sequence has been initialized based on a group index indicative of a group UE to which the UE belongs. Additionally, in certain embodiments, the PR sequence has been initialized independently of a specific UE identifier and/or independently of a resource bandwidth (PDSCH) assigned to a specific UE.
    [00094] Process 900 then proceeds to operation 920 where data is received by the UE on a DL bandwidth resource (eg PDSCH). Process 900 proceeds to operation 930 where data received by the UE on the downlink bandwidth resource is decoded by the UE using the received RS-UE. Process 900 ends in final state 940.
    [00095] Those skilled in the art will further appreciate that the various illustrative logic blocks, modules, circuits and algorithmic steps described with respect to the aspects described herein can be implemented as electronic hardware, computer software, or combinations thereof. To clearly illustrate this hardware and software interchangeability, various illustrative components, blocks, modules, circuits, and steps have been described above generally in terms of their functionality. Whether such functionality is implemented as hardware or software depends on the particular application and design constraints imposed on the system as a whole. Those skilled in the art may implement the described functionality in various ways for which the particular application is concerned, but such implementation decisions should not be construed as detracting from the scope of the present description.
    [00096] As used in this application, the terms "component", "module", "system" and the like shall refer to a computer-related entity, be it hardware, a combination of hardware and software, software, or running software. For example, a component can be, but is not limited to, a process running on a processor, a processor, an object, an executable element, an execution sequence, a program and/or a component. By way of illustration, both an application running on a server and the server can be a component. One or more components can reside within a process and/or execution sequence and a component can be located on one computer and/or distributed among two or more computers.
    [00097] The term "illustrative" is used here as meaning serving as an example, case or illustration. Any aspect or design described herein as "illustrative" is not necessarily to be regarded as preferred or advantageous over other features or designs.
    [00098] Several aspects will be presented in terms of systems that can include a number of components, modules and the like. It should be understood and appreciated that the various systems may include additional components, modules, etc. and/or may not include all components, modules, etc. discussed in relation to the figures. A combination of these approaches can also be used. The various aspects described here can be performed on electrical devices including devices that utilize touch screen display technologies and/or mouse and keyboard type interfaces. Examples of such devices include computers (desktop and mobile), smart phones, personal digital assistants (PDAs), and other wired or wireless electronic devices.
    [00099] Additionally, the various illustrative logic blocks, modules and circuits described with respect to the aspects described here can be implemented or realized with a general purpose processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC ), a field-programmable gate assembly (FPGA), or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described herein. A general purpose processor can be a microprocessor, but in the alternative, the processor can be any conventional processor, controller, microcontroller, or state machine. A processor can also be implemented as a combination of computing devices, for example, a combination of a DSP and a microprocessor, a plurality of microprocessors, one or more microprocessors together with a DSP core, or any other similar configuration.
    [000100] Additionally, one or more versions may be implemented as a method, apparatus or article of manufacture using standard programming and/or engineering techniques to produce software, firmware, hardware or any combination thereof to control a computer to implement the aspects. described. The term "article of manufacture" (or alternatively "computer program product") as used herein shall encompass a computer program accessible from any computer readable device, carrier or media. For example, computer readable media may include, but is not limited to magnetic storage devices (eg hard disk, floppy disk, magnetic strips, etc.), optical disks (eg compact disk (CD), versatile disk digital (DVD), etc.), smart cards, and flash memory devices (eg card, stick). Additionally, it should be appreciated that a carrier wave may be employed to carry computer-readable electronic data such as that used in transmitting and receiving electronic mail or in accessing a network such as the Internet or a local area network (LAN) . Obviously, those skilled in the art will recognize that many modifications can be made to this configuration without departing from the scope of the aspects described.
    [000101] The steps of a method or algorithm described with respect to the aspects described here can be directly embodied in hardware, in a software module executed by a processor or in a combination of the two. A software module may reside in RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, registers, hard disk, removable disk, CD-ROM, or any other form of storage medium known in the art. An illustrative storage medium is coupled to the processor so that the processor can read information from and write information to the storage medium. Alternatively, the storage medium can be integral to the processor. The processor and storage medium can reside on an ASIC. The ASIC can reside on a user terminal. Alternatively, the processor and storage medium can reside as discrete components in a user terminal.
    [000102] In one or more illustrative modes, the functions described can be implemented in hardware, software, firmware, or any combination thereof. If implemented in software, functions may be stored in or encoded as one or more instructions or code on a non-transient computer readable medium. Computer-readable media includes computer storage media. Storage media can be any available media that can be accessed by a computer. By way of example, and not limitation, such computer-readable media may comprise RAM, ROM, EEPROM, CD-ROM or other optical disk storage, magnetic disk storage or other magnetic storage devices, or any instructions or structures of data and that can be accessed by a computer. Floppy disk and disc, as used herein, include compact disc (CD), laser disc, optical disc, digital versatile disc (DVD), floppy disk, and blu-ray disc where discs normally reproduce data magnetically, while discs reproduce data optically with lasers. Combinations of the above should also be included in the scope of non-transient computer readable media.
    [000103] The foregoing description of the aspects described is provided to allow any person skilled in the art to create or make use of the present description. Various modifications to these aspects will be readily apparent to those skilled in the art, and the general principles defined here can be applied to other modalities without departing from the spirit or scope of the description. Accordingly, the present invention is not to be limited to the embodiments illustrated herein, but the broader scope consistent with the principles and novel features described herein should be accorded.
    [000104] In view of the illustrative systems described above, the methodologies that can be implemented according to the present described matter have been described with reference to several flowcharts. While for the sake of simplicity of explanation, the methodologies are illustrated and described as a series of blocks, it should be understood and appreciated that the present claimed subject matter is not limited by the order of blocks, as some blocks may occur in different orders and/ or simultaneously with other blocks from what was presented and described here. Furthermore, not all blocks illustrated may be necessary to implement the methodologies described here. Additionally, it should be further appreciated that the methodologies described here may be stored in an article of manufacture to facilitate transport and transfer of such methodologies to computers. The term article of manufacture, as used herein, shall encompass a computer program accessible from any computer-readable device, carrier, or media.
    [000105] It should be appreciated that any patent, publication or other descriptive material, in whole or in part, which is deemed incorporated by reference herein is incorporated herein only to the extent that the incorporated material does not conflict with the definitions, statements or other existing description material presented in that description. As such, and to the extent necessary, the description as explicitly presented herein supersedes any conflicting material incorporated herein by reference. Any material or part thereof that is considered incorporated by reference herein but which conflicts with existing definitions, statements or other descriptive material presented herein, will only be incorporated to the extent that no conflict arises between such incorporated material and the descriptive material existing.
    权利要求:
    Claims (9)
    [0001]
    1. Method of data communication in a wireless communication system, characterized in that it comprises: - initializing (510) a plurality of pseudo-random sequences, each pseudo-random sequence corresponding to a user equipment specific reference signal, RSs -UE, for use by at least one user equipment, UE, from a plurality of user equipment, UEs, the initialization of each pseudo-random sequence being independent of a specific UE identifier and independent of a resource bandwidth assigned to a specific UE, and the initialization being based on at least one group ID corresponding to a group of UEs to which the at least one UE is assigned and a cell ID; - generating (520) the plurality of pseudo-random sequences; and - mapping (530) at least one of the plurality of pseudo-random sequences to a portion of common resources for at least one UE among the plurality of UEs.
    [0002]
    Method according to claim 1, characterized in that the initialization step (510), cinit is an initial value of a pseudo-random sequence generator associated with each RS-UE and is a defined function
    [0003]
    Method according to claim 1, characterized in that it further comprises assigning the group ID semi-static or dynamically.
    [0004]
    4. Method according to claim 2, characterized in that there are two groups, a first of the two groups having n_groupID = 0, and a second of the two groups having n_groupID = 1.
    [0005]
    5. Method according to claim 1, characterized in that at least one UE is assigned to the UE group based on one of a UE location, a UE dominant channel direction and a total number of current UEs assigned to the group HUH.
    [0006]
    6. Method of data communication in a wireless communication system, characterized in that it comprises: - receiving (610) at least one pseudo-random sequence of a plurality of pseudo-random sequences, each pseudo-random sequence of the plurality of pseudo-sequences -randoms corresponding to a user equipment specific reference signal, RSs-UE, for use by at least one user equipment, UE, each pseudo-random sequence having been initialized independent of a specific UE identifier and independent of a width of resource band assigned to a specific UE, and each pseudo-random sequence having been initialized based at least in part on a group ID corresponding to a group of UE to which the at least one UE is assigned and an ID of cell; - receiving (620) data on a downlink bandwidth resource; and - using (630) the RS-UE to decode data received on the downlink bandwidth resource.
    [0007]
    7. Apparatus in a wireless communication network, characterized in that it comprises: - mechanisms for initializing (308) a plurality of pseudo-random sequences, each pseudo-random sequence of the plurality of pseudo-random sequences corresponding to a specific reference signal of user equipment, RSs-UE, for use by at least one user equipment, UE, from a plurality of user equipment, UEs, the initialization of each pseudo-random sequence being independent of a specific UE identifier and independent of a resource bandwidth assigned to a specific UE, and the initialization being based on at least one group ID corresponding to a UE group to which the at least one UE is assigned and a cell ID; - mechanisms for generating the plurality of pseudo-random sequences; and - mechanisms for mapping (310) at least one of the plurality of pseudo-random sequences to a portion of common resources for at least one UE among the plurality of UEs.
    [0008]
    8. Apparatus in a wireless communication system, characterized in that it comprises: - mechanisms for receiving (314) at least one pseudo-random sequence of a plurality of pseudo-random sequences, each pseudo-random sequence of the plurality of pseudo-random sequences corresponding to a user equipment specific reference signal, RSs-UE, for use by at least one user equipment, UE, each pseudo-random sequence having been initialized independent of a specific UE identifier and independent of a bandwidth of resource assigned to a specific UE, and each pseudo-random sequence having been initialized based at least in part on a group ID corresponding to a group of UEs to which the at least one UE is assigned and a cell ID; - mechanisms for receiving data on a downlink bandwidth resource; and - mechanisms for using (316) the RS-UE to decode the data received on the downlink bandwidth resource.
    [0009]
    9. Memory characterized by comprising instructions stored therein which, when executed by a computer, cause the computer to execute a method as defined in any one of claims 1 to 6.
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    法律状态:
    2019-01-08| B06F| Objections, documents and/or translations needed after an examination request according [chapter 6.6 patent gazette]|
    2020-01-28| B15K| Others concerning applications: alteration of classification|Free format text: A CLASSIFICACAO ANTERIOR ERA: H04J 11/00 Ipc: H04J 11/00 (2006.01), H04J 13/16 (2011.01), H04J 1 |
    2020-01-28| B06U| Preliminary requirement: requests with searches performed by other patent offices: procedure suspended [chapter 6.21 patent gazette]|
    2021-03-09| B09A| Decision: intention to grant [chapter 9.1 patent gazette]|
    2021-05-25| 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 30/09/2010, OBSERVADAS AS CONDICOES LEGAIS. PATENTE CONCEDIDA CONFORME ADI 5.529/DF |
    优先权:
    申请号 | 申请日 | 专利标题
    US24749109P| true| 2009-09-30|2009-09-30|
    US61/247,491|2009-09-30|
    US24883009P| true| 2009-10-05|2009-10-05|
    US61/248,830|2009-10-05|
    US12/890,182|US8948097B2|2009-09-30|2010-09-24|UE-RS sequence initialization for wireless communication systems|
    US12/890,182|2010-09-24|
    PCT/US2010/050906|WO2011041544A2|2009-09-30|2010-09-30|Ue-rs sequence initialization for wireless communication systems|
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