WO2022081994A1 - Terminal et procédé pour effectuer un groupage temporel de ressources de srs pour des améliorations de couverture de srs - Google Patents

Terminal et procédé pour effectuer un groupage temporel de ressources de srs pour des améliorations de couverture de srs Download PDF

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Publication number
WO2022081994A1
WO2022081994A1 PCT/US2021/055213 US2021055213W WO2022081994A1 WO 2022081994 A1 WO2022081994 A1 WO 2022081994A1 US 2021055213 W US2021055213 W US 2021055213W WO 2022081994 A1 WO2022081994 A1 WO 2022081994A1
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WIPO (PCT)
Prior art keywords
srs
time
srs resources
resources
resource
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PCT/US2021/055213
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English (en)
Inventor
Nadisanka Rupasinghe
Yuki Matsumura
Original Assignee
Ntt Docomo, Inc.
Docomo Innovations, Inc.
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Application filed by Ntt Docomo, Inc., Docomo Innovations, Inc. filed Critical Ntt Docomo, Inc.
Publication of WO2022081994A1 publication Critical patent/WO2022081994A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0014—Three-dimensional division
    • H04L5/0023—Time-frequency-space
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0091—Signaling for the administration of the divided path
    • H04L5/0094—Indication of how sub-channels of the path are allocated
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/0202—Channel estimation
    • H04L25/0204—Channel estimation of multiple channels
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/0202—Channel estimation
    • H04L25/0224—Channel estimation using sounding signals
    • H04L25/0226—Channel estimation using sounding signals sounding signals per se

Definitions

  • One or more embodiments disclosed herein relate to a terminal and a method for performing SRS resources time bundling for sounding reference signal (SRS) coverage enhancements.
  • SRS sounding reference signal
  • Rel. 15 of New Radio includes a number of Multiple Input-Multiple
  • Rel. 16 of NR enhances Rel. 15 by introducing enhanced Type II codebook with Discrete Fourier Transform (DFT)-based compression, support for multi-Tx/Rx Point (TRP) transmission for enhanced Mobile Broadband (eMBB) and Physical Data Shared Channel (PDSCH), enhancements for multi-beam operation including reduction in latency and/or overhead for various reconfigurations (Quasi Co Location (QCL)- related, measurements), SCell beam failure recovery (BFR), and LI- signal-to-noise and interference ratio (SINR).
  • DFT Discrete Fourier Transform
  • TRP multi-Tx/Rx Point
  • PDSCH Physical Data Shared Channel
  • enhancements for multi-beam operation including reduction in latency and/or overhead for various reconfigurations (Quasi Co Location (QCL)- related, measurements), SCell beam failure recovery (BFR), and LI- signal-to-noise and interference ratio (SINR).
  • QCL Quadrosi Co Location
  • BFR SCell beam failure
  • Non-Patent Reference 1 3GPP RP 193133, “New WID: Further enhancements on MIMO for NR”, Dec., 2019.
  • Non-Patent Reference 2 3GPP TS 38.211, “NR; Physical channels and modulation (Release 16)”.
  • inventions disclosed herein relate to a terminal that performs SRS resource time bundling for SRS coverage.
  • the terminal includes a receiver that receives information relating to multiple SRS resources.
  • the information includes an indication related to considering the plurality of SRS resources for time bundling.
  • the receiver receives index information for each SRS resource out of the multiple SRS resources.
  • the terminal includes a processor that considers whether the information relating to the plurality of SRS resources is equal or different with respect to each SRS resource.
  • the processor time bundles SRS resources based on similarities in the information.
  • inventions disclosed herein relate to a terminal that performs SRS resource time bundling for SRS coverage.
  • the terminal includes a receiver that receives information relating to SRS resources from same or different SRS resource sets with different usages.
  • the terminal includes a processor that considers whether the information relating to each SRS resource out of the plurality of SRS resources is equal or different.
  • the processor time bundles some of the SRS resources based on similarities in their respective information.
  • embodiments disclosed herein relate to a method for performing SRS resource time bundling for SRS coverage.
  • the method includes obtaining information relating to multiple SRS resources.
  • the information includes an indication related to considering the plurality of SRS resources for time bundling.
  • the method includes obtaining index information for each SRS resource out of the multiple SRS resources.
  • the method includes considering whether the information relating to the plurality of SRS resources is equal or different with respect to each SRS resource.
  • the method includes time bundling SRS resources based on similarities in the information.
  • embodiments disclosed herein relate to a method for performing SRS resource time bundling for SRS coverage.
  • the method includes obtaining information relating to SRS resources from same or different SRS resource sets with different usages.
  • the method includes considering whether the information relating to each SRS resource out of the various SRS resources is equal or different.
  • the method includes considering whether the information relating to the plurality of SRS resources is equal or different with respect to each SRS resource.
  • the method includes time bundling some of the SRS resources based on similarities in their respective information.
  • the method includes assigning the SRS resources to a same antenna port.
  • FIG. 1 shows a diagram showing a configuration of a wireless communication system according to one or more embodiments of the present invention.
  • FIG. 2 shows a diagram showing a configuration of a wireless communication system according to one or more embodiments of the present invention.
  • FIG. 3 shows an example in accordance with one or more embodiments.
  • FIG. 4 shows an example in accordance with one or more embodiments.
  • FIG. 5A and FIG. 5B show examples in accordance with one or more embodiments.
  • FIG. 6 shows an example in accordance with one or more embodiments.
  • FIG. 7A and FIG. 7B show examples in accordance with one or more embodiments.
  • FIG. 8 shows an example in accordance with one or more embodiments.
  • FIG. 9 shows an example in accordance with one or more embodiments.
  • FIG. 10 shows an example in accordance with one or more embodiments.
  • FIG. 11 shows an example configuration instruction in accordance with one or more embodiments.
  • FIG. 12 shows an example configuration instruction in accordance with one or more embodiments.
  • FIG. 13 shows a block diagram of an assembly in accordance with one or more embodiments.
  • FIG. 14 shows a block diagram of an assembly in accordance with one or more embodiments.
  • FIG. 15 shows a block diagram of an assembly in accordance with one or more embodiments.
  • ordinal numbers e.g, first, second, third, etc.
  • an element z. e. , any noun in the application.
  • the use of ordinal numbers is not to imply or create any particular ordering of the elements nor to limit any element to being a single element unless expressly disclosed, such as by the use of the terms “before,” “after,” “single,” and other such terminology. Rather, the use of ordinal numbers is to distinguish between the elements.
  • a first element is distinct from a second element, and the first element may encompass more than one element and succeed (or precede) the second element in an ordering of elements.
  • enhancements in NR may include one or more areas of technological advancement.
  • a technological advancement may be to aggressively reduce latency and/or overhead in high-speed vehicular scenarios (e.g, a UE traveling at high speed on highways) at FR2 - not only for intra-cell, but also for L1/L2 centric inter-cell mobility. This also includes reducing occurrences of beam failure events.
  • a technological advancement may enable further panel-specific UL beam selection. This offers some potential for increasing UL coverage including mitigating the UL coverage loss due to meeting the MPE (maximum permissible exposure) regulation.
  • a technological advancement may be to aggressively reduce latency and/or overhead in high-speed vehicular scenarios (e.g, a UE traveling at high speed on highways) at FR2 - not only for intra-cell, but also for L1/L2 centric inter-cell mobility. This also includes reducing occurrences of beam failure events.
  • a technological advancement may enable further panel-specific UL beam selection. This offers some potential for increasing UL coverage
  • a technological advancement may be implementing channels other than PDSCH that benefit from multi-TRP transmission (as well as multi-panel reception), which also includes multi-TRP for inter-cell operations. This includes some cases for multi-TRP such as UL dense deployment within a macro-cell and/or heterogeneous- network-type deployment scenarios.
  • a technological advancement may be to enhance capacity and coverage of SRS for various scenarios.
  • a technological advancement may be to support enhanced Type II CSI. This includes CSI designed for multi-TRP/panel for NC-JT use case and the utilization of partial reciprocity on channel statistics such as angles and delays mainly targeting FR1 FDD deployments.
  • SRS capacity and/or coverage includes SRS time bundling, increased SRS repetition, and partial sounding across frequency.
  • SRS time bundling may be introduced to enhance SRS coverage in a wireless communication system while focusing on lowering overhead.
  • a wireless communication system 100 according to one or more embodiments of the present invention will be described below with reference to FIG. 1.
  • the wireless communication system 100 includes a User Equipment (UE) 10, a Base Station (BS) 20, and a core network 30.
  • the wireless communication system 100 may be a New Radio (NR) system or a Long-Term Evolution (LTE)/LTE- Advanced (LTE-A) system.
  • NR New Radio
  • LTE Long-Term Evolution
  • LTE-A Long-Term Evolution-Advance
  • the BS 20 communicates with the UE 10 via multiple antenna ports using a multiple-input and multiple-output (MIMO) technology.
  • the BS 20 may be a gNodeB (gNB) or an Evolved NodeB (eNB).
  • the BS 20 receives downlink packets from a network equipment such as upper nodes or servers connected on the core network 30 via the access gateway apparatus and transmits the downlink packets to the UE 10 via the multiple antenna ports.
  • the BS 20 receives uplink packets from the UE 10 and transmits the uplink packets to the network equipment via the multiple antenna ports.
  • the BS 20 includes antennas for MIMO to transmit radio signals between the UE 10, a communication interface to communicate with an adjacent BS 20 (for example, X2 interface), a communication interface to communicate with the core network (for example, SI interface), and a CPU (Central Processing Unit) such as a processor or a circuit to process transmitted and received signals with the UE 10.
  • Functions and processing of the BS 20 described below may be implemented by the processor processing or executing data and programs stored in a memory.
  • the BS 20 is not limited to the hardware configuration set forth above and may include any appropriate hardware configurations.
  • a plurality of the BSs 20 may be disposed so as to cover a broader service area of the wireless communication system 1.
  • a BS may also be a terminal.
  • the UE 10 communicates with the BS 20 using the MIMO technology.
  • the UE 10 transmits and receives radio signals such as data signals and control signals between the BS 20 and the UE 10.
  • the UE 10 may be a mobile station, a smartphone, a cellular phone, a tablet, a radio terminal, a terminal, a mobile router, or information processing apparatus having a radio communication function such as a wearable device.
  • the UE 10 includes a CPU such as a processor, a RAM (Random Access Memory), a flash memory, and a radio communication device to transmit/receive radio signals to/from the BS 20 and the UE 10.
  • a CPU such as a processor, a RAM (Random Access Memory), a flash memory, and a radio communication device to transmit/receive radio signals to/from the BS 20 and the UE 10.
  • functions and processing of the UE 10 described below may be implemented by the CPU processing or executing data and programs stored in a memory.
  • the UE 10 is not limited to the hardware configuration set forth above and may be configured with, e.g., a circuit to achieve the processing described below.
  • the wireless communication 1 supports Type II CSI feedback.
  • the BS 20 transmits CSI-Reference Signals (RSs).
  • RSs CSI-Reference Signals
  • the UE 10 receives the CSI-RSs from the BS 20, the UE 10 performs measurements of the received CSI-RSs.
  • the UE 10 performs CSI reporting to notify the BS 20 of the CSI as CSI feedback.
  • the CSI includes at least one of rank indicator (RI), precoding matrix indicator (PMI), channel quality information (CQI), CSI-RS resource indicator (CRI), a wideband (WB) amplitude, and a subband (SB) amplitude.
  • the CSI reporting that reports the SB amplitude may be referred to as SB amplitude reporting.
  • SB amplitude reporting may be referred to as SB amplitude reporting.
  • the periodicity of reporting the SB amplitude may be dynamically adjusted using higher layer signaling from the BS 20.
  • SRS time bundling may be used enhance SRS coverage in a wireless communication system 2000.
  • the communication system 400 includes the UE 10 and the BS 20.
  • a UL SRS transmission 2010 is transmitted from the UE 10 to the BS 10.
  • the BS 20 may exchange beamformed CSI-RS 2020 to the UE 10, which causes the UE 10 to report at least UL CSI.
  • the reporting provided by the UE 10 may be transmitted in UL CSI reporting 2030.
  • FIG. 3 shows an example of SRS time bundling configured for SRS coverage enhancement in the communication systems 100 and 2000.
  • FIG. 3 shows an example of four SRS transmissions taking place at different slots.
  • the SRS transmissions are bundled together for channel estimation.
  • SRS repetition for a given SRS resource is used for enhancing the SRS coverage.
  • the UL capacity may be negatively affected.
  • intra-slot and inter-slot time bundling may be applied between the same or different SRS resources.
  • time bundling utilizes a relationship among two or more occasions of one or more SRS resources or occasions to enable joint processing within time domain, without changing legacy SRS pattern in one resource.
  • SRS time bundling may be introduced so that multiple SRS resources are time bundled together to enhance the SRS coverage while reducing the impact on the UL capacity.
  • inter-slot time bundling may be performed to enhance SRS coverage.
  • FIG. 4 shows an example of intra-slot time bundling configured for coverage enhancement in the communication systems 100 and 2000.
  • multiple SRS resources from the same or different SRS resource sets are time bundled together within a slot for estimating the channel associated with a particular antenna port.
  • the UE 10 may receive information relating to various SRS resources. To this point, the information may include an indication related to considering the SRS resources for time bundling. Further, the UE 20 may receive index information for each SRS resource out of the SRS resources.
  • time bundled SRS resources may be assigned to a same SRS antenna port. In this case, periodicities of different time- bundled SRS resources within a slot may be same or different. As shown in FIG. 4, two SRS resources from two SRS resource sets may be time bundled together to estimate the channel associated with an antenna port APi.
  • a NW may trigger an aperiodic SRS resource to be transmitted within a particular UL slot while bundling it with already configured for transmission of periodic SRS resources, SP resources, or aperiodic SRS resources transmitting within the same slot.
  • information is needed for configuring one or more SRS resources from SRS resource sets that are time bundled.
  • the information may indicate explicitly, or implicitly, SRS resources/SRS resource sets which need to be considered for time bundling. Further, the information may indicate some index per SRS resource/SRS resource set. Then the SRS resources/SRS resource sets corresponding to the same index may be time bundled. In this case, the information may be configured using higher layer or DCI signaling.
  • the information relating to the SRS resources may include parameter transmissionComb. Configurations of time-bundled SRS resources for the parameter may be the same or different. In this case, different time bundled SRS resources can be assigned to different SRS antenna ports for estimating channels associated with the respective antenna ports.
  • FIG. 5A and FIG. 5B show examples of intra-slot time bundling configured for coverage enhancement in the communication systems 100 and 2000.
  • multiple SRS resources from the same or different SRS resource sets with different usages may be time-bundled together within a slot for estimating the channel associated with a particular antenna port.
  • same slot bundling may be performed because time bundled SRS resources may be assigned to a same SRS antenna port.
  • the periodicities of different SRS resources time bundled within a slot can be the same or different.
  • two SRS resources from two SRS resource sets with different usages are time bundled together to estimate the channel associated with the antenna port APi.
  • the NW triggers an aperiodic SRS resource to be transmitted within a particular UL slot while time bundling it with already configured periodic/SP/aperiodic SRS resource transmission takes place within the same slot.
  • the NW configures time bundling of different periodic/SP SRS resources with different periodicities, whenever they fall into the same UL slot. The time bundled SRS resources are transmitted from the same SRS antenna port.
  • FIG. 5 A and FIG. 5B may be implemented for time bundles of more than 2 SRS resources as well as time bundling of 4 or 8 SRS resources.
  • the bundle size (explained in more detail below) is 2 in these examples.
  • FIG. 6 shows an example of inter-slot time bundling configured for coverage enhancement in the communication systems 100 and 2000.
  • single or multiple SRS resource(s) from the same slot, or different SRS resource sets occurring at different slots may be time-bundled together for estimating channel associated with a particular antenna port.
  • time bundled SRS resources may be assigned to a same SRS antenna port.
  • periodic/SP SRS resource with single SRS symbol may be time-bundled considering bundle sizes ofx ⁇ ⁇ 1, 2, 4 ⁇ symbols.
  • parameters may be a starting slot, a bundle size, and a separation of consecutive time bundled symbols.
  • the slot carrying the first SRS symbol/re source of time-bundle may be configured using higher layer or DCI signaling.
  • the NW triggers a time bundled SRS transmission using higher layer signaling or DCI.
  • the UE may transmit a first symbol based on a pre-configured offset in the specification.
  • the NW triggers a time bundled SRS transmission using higher layer signaling or DCI.
  • the UE may transmit the first symbol based on an offset configured using higher layer signaling.
  • the bundle size x may be 1, 2, 4, 8, or other values. This value may be configured using higher layer or DCI signaling.
  • the separation between two consecutive time bundled SRS symbols is configured using higher layer or DCI signaling.
  • the separation may be pre-configured in the specification. The separation may be defined in terms of number of UL slots.
  • time bundling is performed considering explicit/implicit indication of SRS resources/SRS resource sets for time bundling; indication of some index per SRS resource/SRS resource set.
  • the SRS resources/SRS resource sets corresponding to the same index may be time bundled.
  • separate indication of SRS resources may not need to be considered for time -bundling.
  • different time bundled SRS resources may be assigned to different SRS antenna ports for channel estimation.
  • FIG. 7A and FIG. 7B show examples of inter-slot time bundling configured for coverage enhancement in the communication systems 100 and 2000.
  • the NW configures which SRS resources from SRS resource sets are time bundled.
  • explicit/implicit indication of SRS resources/SRS resource sets are considered for time bundling.
  • indication of some index per SRS resource/SRS resource set are considered for time bundling.
  • the SRS resources/SRS resource sets corresponding to the same index may be time bundled.
  • separate indication of SRS resources may not need to be considered for time -bundling.
  • different time bundled SRS resources may be assigned to different SRS antenna ports for channel estimation.
  • the NW time bundles aperiodic SRS resources with already configured periodic/semi-periodic (SP)Zaperiodic SRS resources in different slots.
  • time bundling may be done between the nearest SRS transmission of a periodic/SP SRS resource with an aperiodic SRS resource.
  • a periodic/SP SRS resource with a single SRS symbol is time bundled with an aperiodic SRS resource.
  • the bundle size is 2 in this example.
  • the NW configures/triggers a starting slot of a timebundle using an aperiodic SRS resource.
  • a periodic/SP SRS resource may be time bundled with an aperiodic SRS resource such that the starting slot of the time bundle is the slot transmitting an aperiodic SRS resource.
  • the bundle size is 4 this example.
  • the bundle size and the symbol separation may be configured as discussed with respect to FIG. 6.
  • the aperiodic SRS transmission and periodic/SP SRS resource transmission within the time bundle may be done using the same SRS antenna port.
  • the NW may time bundle SRS symbols in different slots from another periodic/SP SRS resource.
  • the SRS resource indication may be done as discussed above.
  • FIG. 8 shows an example of inter-slot time bundling in the communication systems 100 and 2000.
  • inter-slot time bundling may be considered for estimating and tracking spatial covariance of the channel.
  • periodic/SP SRS may be configured with larger periodicity for estimating spatial covariance.
  • time bundling may be configured for periodic/SP SRS transmission in covariance estimation.
  • periodic/SP SRS transmission is time-bundled with an aperiodic SRS transmission for covariance estimation.
  • FIG. 9 shows an example of intra-slot time bundling and inter-slot time bundling configured for coverage enhancement in the communication systems 100 and 2000.
  • multiple SRS resource transmissions may take place within a same slot and among different slots.
  • multiple SRS resource transmissions may be time bundled together for estimating the channel associated with a particular antenna port.
  • Time bundled SRS resources may be assigned to the same SRS antenna port.
  • three SRS resources with a single SRS symbol may be time bundled considering a bundle size of 3 symbols.
  • the time bundling may consider intra-slot and inter-slot bundling jointly. To this point, SRS resource indication of the bundle may be done as discussed above.
  • FIG. 10 shows an example of repetition and inter-slot time bundling configured for coverage enhancement in the communication systems 100 and 2000.
  • SRS resource transmissions may be configured with symbol repetition and that SRS resource transmissions may be time bundled together with an SRS resource transmission takes place in a different slot, for estimating the channel associated with a particular antenna port.
  • Time bundled SRS resources may be assigned to the same SRS antenna port.
  • an SRS resource with repetitionFactor may be configured to 2 such that time-bundling may be performed with an SRS resource with or without repetition.
  • the bundle size is equal to 3.
  • all or some of the time bundled SRS resources may be configured with different values for repetitionFactor. To this point, SRS resource indication of the bundle may be done as discussed above.
  • FIG. 11 shows possible updates for implementing a number of antenna ports such that antenna ports per SRS resource may be changed to include sizes 6 and
  • FIG. 12 shows an example of intra-slot time bundling configured for coverage enhancement in the communication systems 100 and 2000.
  • a parameter SRS-Config IE may be used to configure SRS transmissions.
  • a list of SRS-ResourceSets and SRS-Resources may be defined in SRS-Config.
  • Each SRS-ResourceSets may be configured with a set of SRS- Resources.
  • SRS-ResourceSets may be configured by the parameter usage for applicability.
  • the UE when PUSCH and SRS are transmitted in the same slot, the UE may only be configured to transmit SRS after the transmission of the PUSCH and the corresponding DM-RS.
  • FIG. 13 shows possible updates for implementing an SRS resource configured by SRS-Resource IE and consists.
  • the update includes supporting multiple antenna ports, time domain allocation, frequency domain allocation, related indication of hopping, and SRS characteristics for periodic SRS.
  • the BS 20 may include an antenna 201 for 3D MIMO, an amplifier 202, a transmitter/receiver circuit 203 (hereinafter referred as including a CSI-RS scheduler), a baseband signal processor 204 (hereinafter referred as including a CS-RS generator), a call processor 205, and a transmission path interface 206.
  • the transmitter/receiver 202 includes a transmitter and a receiver.
  • the antenna 201 may comprise a multi-dimensional antenna that includes multiple antenna elements such as a 2D antenna (planar antenna) or a 3D antenna such as antennas arranged in a cylindrical shape or antennas arranged in a cube.
  • the antenna 201 includes antenna ports having one or more antenna elements. The beam transmitted from each of the antenna ports is controlled to perform 3D MIMO communication with the UE 10.
  • the antenna 201 allows the number of antenna elements to be easily increased compared with linear array antenna. MIMO transmission using a large number of antenna elements is expected to further improve system performance. For example, with the 3D beamforming, high beamforming gain is also expected according to an increase in the number of antennas. Furthermore, MIMO transmission is also advantageous in terms of interference reduction, for example, by null point control of beams, and effects such as interference rejection among users in multi-user MIMO can be expected.
  • the amplifier 202 generates input signals to the antenna 201 and performs reception processing of output signals from the antenna 201.
  • the transmitter included in the transmitter/receiver circuit 203 transmits data signals (e.g., reference signals and precoded data signals) via the antenna 201 to the UE 10.
  • the transmitter transmits CSI-RS resource information that indicates a state of the determined CSI-RS resources (e.g., subframe configuration ID and mapping information) to the UE 20 via higher layer signaling or lower layer signaling.
  • the transmitter transmits the CSI-RS allocated to the determined CSI-RS resources to the UE 10.
  • the receiver included in the transmitter/receiver circuit 203 receives data signals (i.e., reference signals and the CSI feedback information) via the antenna 201 from the UE 10.
  • data signals i.e., reference signals and the CSI feedback information
  • the CSI-RS scheduler 203 determines CSI-RS resources allocated to the CSI-RS. For example, the CSI-RS scheduler 203 determines a CSI-RS subframe that includes the CSI-RS in subframes. The CSI-RS scheduler 203 determines at least an RE that is mapped to the CSI-RS. [0071] The CSI-RS generator 204 generates CSI-RS for estimating the downlink channel states. The CSI-RS generator 204 may generate reference signals defined by the LTE standard, dedicated reference signal (DRS) and Cell-specific Reference Signal (CRS), synchronized signals such as Primary synchronization signal (PSS) and Secondary synchronization signal (SSS), and newly defined signals in addition to CSI- RS.
  • DRS dedicated reference signal
  • CRS Cell-specific Reference Signal
  • PSS Primary synchronization signal
  • SSS Secondary synchronization signal
  • the call processor 205 determines a precoder applied to the downlink data signals and the downlink reference signals.
  • the precoder is called a precoding vector or more generally a precoding matrix.
  • the call processor 205 determines the precoding vector (precoding matrix) of the downlink based on the CSI indicating the estimated downlink channel states and the decoded CSI feedback information inputted.
  • the transmission path interface 206 multiplexes CSI-RS on REs based on the determined CSI-RS resources by the CSI-RS scheduler 203.
  • the transmitted reference signals may be Cell-specific or UE-specific.
  • the reference signals may be multiplexed on the signal such as PDSCH, and the reference signal may be precoded.
  • estimation for the channel states may be realized at the suitable rank according to the channel states.
  • the BS 20 further, in one or more embodiments, comprising hardware configured for reducing feedback overhead associated with bitmap reporting between a user equipment and a base station.
  • the BS 20 may include the capabilities described above for reducing feedback overhead when communicating with the UE 10.
  • the UE 10 may comprise a UE antenna 101 used for communicating with the BS 20, an amplifier 102, a transmitter/receiver circuit 103, a controller 104, the controller including a CSI feedback controller and a codeword generator, and a CSI-RS controller.
  • the transmitter/receiver circuit 103 includes a transmitter and a receiver 1031.
  • the transmitter included in the transmitter/receiver circuit 103 transmits data signals (for example, reference signals and the CSI feedback information) via the UE antenna 101 to the BS 20.
  • data signals for example, reference signals and the CSI feedback information
  • the receiver included in the transmitter/receiver circuit 103 receives data signals (for example, reference signals such as CSI-RS) via the UE antenna 101 from the BS 20.
  • data signals for example, reference signals such as CSI-RS
  • the amplifier 102 separates a PDCCH signal from a signal received from the BS 20.
  • the controller 104 estimates downlink channel states based on the CSI- RS transmitted from the BS 20, and then outputs a CSI feedback controller.
  • the CSI feedback controller generates the CSI feedback information based on the estimated downlink channel states using the reference signals for estimating downlink channel states.
  • the CSI feedback controller outputs the generated CSI feedback information to the transmitter, and then the transmitter transmits the CSI feedback information to the BS 20.
  • the CSI feedback information may include at least one of Rank Indicator (RI), PMI, CQI, BI and the like.
  • the CSI-RS controller determines whether the specific user equipment is the user equipment itself based on the CSI-RS resource information when CSI-RS is transmitted from the BS 20.
  • the CSI-RS controller 16 determines that the specific user equipment is the user equipment itself, the transmitter that CSI feedback based on the CSI-RS to the BS 20.
  • the UE 10 further, in one or more embodiments, comprising hardware configured for reducing feedback overhead associated with bitmap reporting between a user equipment and a base station.
  • the UE 10 may include the capabilities described above for reducing feedback overhead when communicating with the BS 20.
  • the above examples and modified examples may be combined with each other, and various features of these examples can be combined with each other in various combinations. The invention is not limited to the specific combinations disclosed herein.

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

Un terminal qui effectue un groupage temporel de ressource de SRS pour une couverture de SRS peut comprendre un récepteur qui reçoit des informations relatives à de multiples ressources de SRS. Les informations peuvent comprendre une indication relative à la prise en compte de la pluralité de ressources de SRS pour le groupage temporel. Le récepteur peut recevoir des informations d'index pour chaque ressource de SRS des multiples ressources de SRS. Le terminal peut comprendre un processeur qui considère si les informations relatives à la pluralité de ressources de SRS sont identiques ou différentes par rapport à chaque ressource de SRS. Le processeur peut regrouper temporellement des ressources de SRS en fonction de similarités dans les informations.
PCT/US2021/055213 2020-10-16 2021-10-15 Terminal et procédé pour effectuer un groupage temporel de ressources de srs pour des améliorations de couverture de srs WO2022081994A1 (fr)

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CN111224766A (zh) * 2020-01-10 2020-06-02 北京紫光展锐通信技术有限公司 参考信号发送方法、参考信号接收方法及通信装置
WO2021229539A1 (fr) * 2020-05-14 2021-11-18 Telefonaktiebolaget Lm Ericsson (Publ) Signalisation pour groupage temporel de transmissions de signal de référence de sondage (srs)

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CN111224766A (zh) * 2020-01-10 2020-06-02 北京紫光展锐通信技术有限公司 参考信号发送方法、参考信号接收方法及通信装置
WO2021229539A1 (fr) * 2020-05-14 2021-11-18 Telefonaktiebolaget Lm Ericsson (Publ) Signalisation pour groupage temporel de transmissions de signal de référence de sondage (srs)

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HUAWEI ET AL: "Enhancements on SRS for Rel-17", vol. RAN WG1, no. E-meeting; 20200817 - 20200828, 8 August 2020 (2020-08-08), XP051917295, Retrieved from the Internet <URL:https://ftp.3gpp.org/tsg_ran/WG1_RL1/TSGR1_102-e/Docs/R1-2005247.zip R1-2005247.docx> [retrieved on 20200808] *
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