WO2022032524A1 - Configuration de motif de signal de référence (rs) d'informations d'état de canal (csi) (csi-rs) pour une coexistence dans des environnements de partage à spectre dynamique - Google Patents

Configuration de motif de signal de référence (rs) d'informations d'état de canal (csi) (csi-rs) pour une coexistence dans des environnements de partage à spectre dynamique Download PDF

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Publication number
WO2022032524A1
WO2022032524A1 PCT/CN2020/108696 CN2020108696W WO2022032524A1 WO 2022032524 A1 WO2022032524 A1 WO 2022032524A1 CN 2020108696 W CN2020108696 W CN 2020108696W WO 2022032524 A1 WO2022032524 A1 WO 2022032524A1
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WIPO (PCT)
Prior art keywords
csi
type
res
rat
frequency resources
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PCT/CN2020/108696
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English (en)
Inventor
Bo Chen
Wentao Zhang
Hao Xu
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Qualcomm Incorporated
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Priority to PCT/CN2020/108696 priority Critical patent/WO2022032524A1/fr
Publication of WO2022032524A1 publication Critical patent/WO2022032524A1/fr

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    • 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
    • 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
    • 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
    • H04L5/0051—Allocation of pilot signals, i.e. of signals known to the receiver of dedicated pilots, i.e. pilots destined for a single user or terminal

Definitions

  • aspects of the present disclosure relate to wireless communications, and more particularly, to techniques for configuring channel state information (CSI) reference signal (RS) (CSI-RS) patterns for coexistence of different radio access technologies in dynamic spectrum sharing environments.
  • CSI channel state information
  • RS reference signal
  • Wireless communication systems are widely deployed to provide various telecommunication services such as telephony, video, data, messaging, broadcasts, etc. These wireless communication systems may employ multiple-access technologies capable of supporting communication with multiple users by sharing available system resources (for example, bandwidth, transmit power, etc. ) .
  • multiple-access systems include 3rd Generation Partnership Project (3GPP) Long Term Evolution (LTE) systems, LTE Advanced (LTE-A) systems, code division multiple access (CDMA) systems, time division multiple access (TDMA) systems, frequency division multiple access (FDMA) systems, orthogonal frequency division multiple access (OFDMA) systems, single-carrier frequency division multiple access (SC-FDMA) systems, and time division synchronous code division multiple access (TD-SCDMA) systems, to name a few.
  • 3GPP 3rd Generation Partnership Project
  • LTE Long Term Evolution
  • LTE-A LTE Advanced
  • CDMA code division multiple access
  • TDMA time division multiple access
  • FDMA frequency division multiple access
  • OFDMA orthogonal frequency division
  • New radio for example, 5G NR
  • 5G NR is an example of an emerging telecommunication standard.
  • NR is a set of enhancements to the LTE mobile standard promulgated by 3GPP.
  • NR is designed to better support mobile broadband Internet access by improving spectral efficiency, lowering costs, improving services, making use of new spectrum, and better integrating with other open standards using OFDMA with a cyclic prefix (CP) on the downlink (DL) and on the uplink (UL) .
  • CP cyclic prefix
  • NR supports beamforming, multiple-input multiple-output (MIMO) antenna technology, and carrier aggregation.
  • MIMO multiple-input multiple-output
  • the method generally includes configuring a set of resource elements (REs) for transmitting a first type of channel state information (CSI) reference signal (RS) (CSI-RS) on REs reserved for a second type of CSI-RS such that the first type of CSI-RS does not collide with data or control REs; transmitting, to a user equipment (UE) , the first type of CSI-RS on the identified set of REs; and receiving, from the UE, a CSI report based on the transmitted first type of CSI-RS.
  • REs resource elements
  • CSI-RS channel state information reference signal
  • the method generally includes receiving, from a network entity, a configuration of a set of resource elements (REs) on which a first type of channel sate information (CSI) reference signal (RS) (CSI-RS) is transmitted, the set of REs comprising REs reserved for a second type of CSI-RS such that the first type of CSI-RS does not collide with data or control REs; receiving the first type of CSI-RS on the identified set of REs; generating a CSI report based on the received first type of CSI-RS; and transmitting the CSI report to the network entity.
  • REs resource elements
  • CSI-RS channel sate information reference signal
  • aspects of the present disclosure provide means for, apparatus, processors, and computer-readable mediums for performing the methods described herein.
  • the one or more aspects comprise the features hereinafter fully described and particularly pointed out in the claims.
  • the following description and the appended drawings set forth in detail some illustrative features of the one or more aspects. These features are indicative, however, of but a few of the various ways in which the principles of various aspects may be employed.
  • FIG. 1 shows an example wireless communication network in which some aspects of the present disclosure may be performed.
  • FIG. 2 shows a block diagram illustrating an example base station (BS) and an example user equipment (UE) in accordance with some aspects of the present disclosure.
  • FIG. 3A illustrates an example of a frame format for a telecommunication system.
  • FIG. 3B illustrates how different synchronization signal blocks (SSBs) may be sent using different beams.
  • SSBs synchronization signal blocks
  • FIG. 4 illustrates example spectrum usage for deployments of a first radio access technology and a second radio access technology.
  • FIG. 5 illustrates an example resource element configuration for transmitting a channel state information (CSI) reference signal (RS) for a first radio access technology (RAT) in resource elements configured for a second RAT.
  • CSI channel state information
  • RAT radio access technology
  • FIG. 6 illustrates example channel state information (CSI) reference signal (RS) pattern structures.
  • CSI channel state information
  • RS reference signal
  • FIG. 7 illustrates example definitions of channel state information (CSI) reference signal (RS) patterns.
  • CSI channel state information
  • RS reference signal
  • FIG. 8 illustrates an example of collisions between patterns for a first type of channel state information (CSI) reference signal (RS) for a first radio access technology (RAT) and data and control signals for a second RAT.
  • CSI channel state information
  • RAT radio access technology
  • FIG. 9 illustrates example operations for wireless communication by a network entity, in accordance with some aspects of the present disclosure.
  • FIG. 10 illustrates example operations for wireless communication by a user equipment (UE) , in accordance with some aspects of the present disclosure.
  • UE user equipment
  • FIGs. 11 and 12 illustrate example configurations for a first type of channel state information (CSI) reference signal (RS) for a first radio access technology that do not collide with data or control resource elements (REs) , in accordance with some aspects of the present disclosure.
  • CSI channel state information
  • RS reference signal
  • REs data or control resource elements
  • aspects of the present disclosure relate to wireless communications, and more particularly, to mobility techniques that allow for configuring channel state information (CSI) reference signal (RS) (CSI-RS) patterns for coexistence of different radio access technologies in dynamic spectrum sharing environments.
  • CSI channel state information
  • RS reference signal
  • CSI-RS channel state information reference signal
  • any number of wireless networks may be deployed in a given geographic area.
  • Each wireless network may support a particular radio access technology (RAT) and may operate on one or more frequencies.
  • a RAT may also be referred to as a radio technology, an air interface, etc.
  • a frequency may also be referred to as a carrier, a subcarrier, a frequency channel, a tone, a subband, etc.
  • Each frequency may support a single RAT in a given geographic area in order to avoid interference between wireless networks of different RATs.
  • a 5G NR RAT network may be deployed.
  • FIG. 1 illustrates an example wireless communication network 100 in which aspects of the present disclosure may be performed.
  • UE 120a may include a CSI measurement configuration module 122 that may be configured to perform (or cause UE 120a to perform) operations 1000 of FIG. 10.
  • a BS 120a may include a CSI measurement configuration module 112 that may be configured to perform (or cause BS 110a to perform) operations 900 of FIG. 9.
  • NR access may support various wireless communication services, such as enhanced mobile broadband (eMBB) targeting wide bandwidth (for example, 80 MHz or beyond) , millimeter wave (mmWave) targeting high carrier frequency (for example, 25 GHz or beyond) , massive machine type communications MTC (mMTC) targeting non-backward compatible MTC techniques, or mission critical services targeting ultra-reliable low-latency communications (URLLC) .
  • eMBB enhanced mobile broadband
  • mmWave millimeter wave
  • mMTC massive machine type communications MTC
  • URLLC ultra-reliable low-latency communications
  • These services may include latency and reliability requirements.
  • These services may also have different transmission time intervals (TTI) to meet respective quality of service (QoS) requirements.
  • TTI transmission time intervals
  • QoS quality of service
  • these services may co-exist in the same time-domain resource (for example, a slot or subframe) or frequency-domain resource (for example, component carrier) .
  • the wireless communication network 100 may include a number of base stations (BSs) 110a-z (each also individually referred to herein as BS 110 or collectively as BSs 110) and other network entities.
  • a BS 110 may provide communication coverage for a particular geographic area, sometimes referred to as a “cell” , which may be stationary or may move according to the location of a mobile BS 110.
  • the BSs 110 may be interconnected to one another or to one or more other BSs or network nodes (not shown) in wireless communication network 100 through various types of backhaul interfaces (for example, a direct physical connection, a wireless connection, a virtual network, or the like) using any suitable transport network.
  • backhaul interfaces for example, a direct physical connection, a wireless connection, a virtual network, or the like
  • the BSs 110a, 110b and 110c may be macro BSs for the macro cells 102a, 102b and 102c, respectively.
  • the BS 110x may be a pico BS for a pico cell 102x.
  • the BSs 110y and 110z may be femto BSs for the femto cells 102y and 102z, respectively.
  • a BS may support one or multiple cells.
  • the BSs 110 communicate with user equipment (UEs) 120a-y (each also individually referred to herein as UE 120 or collectively as UEs 120) in the wireless communication network 100.
  • the UEs 120 (for example, 120x, 120y, etc. ) may be dispersed throughout the wireless communication network 100, and each UE 120 may be stationary or mobile.
  • Wireless communication network 100 may also include relay stations (for example, relay station 110r) , also referred to as relays or the like, that receive a transmission of data or other information from an upstream station (for example, a BS 110a or a UE 120r) and sends a transmission of the data or other information to a downstream station (for example, a UE 120 or a BS 110) , or that relays transmissions between UEs 120, to facilitate communication between devices.
  • relay stations for example, relay station 110r
  • relays or the like that receive a transmission of data or other information from an upstream station (for example, a BS 110a or a UE 120r) and sends a transmission of the data or other information to a downstream station (for example, a UE 120 or a BS 110) , or that relays transmissions between UEs 120, to facilitate communication between devices.
  • a network controller 130 may couple to a set of BSs 110 and provide coordination and control for these BSs 110.
  • the network controller 130 may communicate with the BSs 110 via a backhaul.
  • the BSs 110 may also communicate with one another (for example, directly or indirectly) via wireless or wireline backhaul.
  • FIG. 2 shows a block diagram illustrating an example base station (BS) and an example user equipment (UE) in accordance with some aspects of the present disclosure.
  • a transmit processor 220 may receive data from a data source 212 and control information from a controller/processor 240.
  • the control information may be for the physical broadcast channel (PBCH) , physical control format indicator channel (PCFICH) , physical hybrid ARQ indicator channel (PHICH) , physical downlink control channel (PDCCH) , group common PDCCH (GC PDCCH) , etc.
  • the data may be for the physical downlink shared channel (PDSCH) , etc.
  • the processor 220 may process (for example, encode and symbol map) the data and control information to obtain data symbols and control symbols, respectively.
  • the transmit processor 220 may also generate reference symbols, such as for the primary synchronization signal (PSS) , secondary synchronization signal (SSS) , and cell-specific reference signal (CRS) .
  • a transmit (TX) multiple-input multiple-output (MIMO) processor 230 may perform spatial processing (for example, precoding) on the data symbols, the control symbols, or the reference symbols, if applicable, and may provide output symbol streams to the modulators (MODs) 232a-232t.
  • Each modulator 232 may process a respective output symbol stream (for example, for OFDM, etc. ) to obtain an output sample stream.
  • Each modulator may further process (for example, convert to analog, amplify, filter, and upconvert) the output sample stream to obtain a downlink signal.
  • Downlink signals from modulators 232a-232t may be transmitted via the antennas 234a-234t, respectively.
  • the antennas 252a-252r may receive the downlink signals from the BS 110 and may provide received signals to the demodulators (DEMODs) in transceivers 254a-254r, respectively.
  • Each demodulator 254 may condition (for example, filter, amplify, downconvert, and digitize) a respective received signal to obtain input samples.
  • Each demodulator may further process the input samples (for example, for OFDM, etc. ) to obtain received symbols.
  • a MIMO detector 256 may obtain received symbols from all the demodulators 254a-254r, perform MIMO detection on the received symbols if applicable, and provide detected symbols.
  • a receive processor 258 may process (for example, demodulate, deinterleave, and decode) the detected symbols, provide decoded data for the UE 120 to a data sink 260, and provide decoded control information to a controller/processor 280.
  • a transmit processor 264 may receive and process data (for example, for the physical uplink shared channel (PUSCH) ) from a data source 262 and control information (for example, for the physical uplink control channel (PUCCH) from the controller/processor 280.
  • the transmit processor 264 may also generate reference symbols for a reference signal (for example, for the sounding reference signal (SRS) ) .
  • the symbols from the transmit processor 264 may be precoded by a TX MIMO processor 266 if applicable, further processed by the demodulators in transceivers 254a-254r (for example, for SC-FDM, etc. ) , and transmitted to the BS 110.
  • the uplink signals from the UE 120 may be received by the antennas 234, processed by the modulators 232, detected by a MIMO detector 236 if applicable, and further processed by a receive processor 238 to obtain decoded data and control information sent by the UE 120.
  • the receive processor 238 may provide the decoded data to a data sink 239 and the decoded control information to the controller/processor 240.
  • the memories 242 and 282 may store data and program codes for BS 110 and UE 120, respectively.
  • a scheduler 244 may schedule UEs for data transmission on the downlink or uplink.
  • the controller/processor 280 or other processors and modules at the UE 120 may perform or direct the execution of processes for the techniques described herein.
  • the controller/processor 280 of the UE 120 has a CSI measurement configuration module 122 that may be configured to perform (or cause UE 120 to perform) operations 1000 of FIG. 10.
  • the BS 120a may include a CSI measurement configuration module 112 that may be configured to perform (or cause BS 110a to perform) operations 900 of FIG. 9.
  • FIG. 3A is a diagram showing an example of a frame format 300 for NR.
  • the transmission timeline for each of the downlink and uplink may be partitioned into units of radio frames.
  • Each radio frame may have a predetermined duration (e.g., 10 ms) and may be partitioned into 10 subframes, each of 1 ms, with indices of 0 through 9.
  • Each subframe may include a variable number of slots depending on the subcarrier spacing.
  • Each slot may include a variable number of symbol periods (e.g., 7 or 14 symbols) depending on the subcarrier spacing.
  • the symbol periods in each slot may be assigned indices.
  • a mini-slot which may be referred to as a sub-slot structure, refers to a transmit time interval having a duration less than a slot (e.g., 2, 3, or 4 symbols) .
  • Each symbol in a slot may indicate a link direction (e.g., DL, UL, or flexible) for data transmission and the link direction for each subframe may be dynamically switched.
  • the link directions may be based on the slot format.
  • Each slot may include DL/UL data as well as DL/UL control information.
  • a synchronization signal (SS) block is transmitted.
  • the SS block includes a PSS, a SSS, and a two symbol PBCH.
  • the SS block can be transmitted in a fixed slot location, such as the symbols 0-3 as shown in FIG. 3A.
  • the PSS and SSS may be used by UEs for cell search and acquisition.
  • the PSS may provide half-frame timing, the SS may provide the CP length and frame timing.
  • the PSS and SSS may provide the cell identity.
  • the PBCH carries some basic system information, such as downlink system bandwidth, timing information within radio frame, SS burst set periodicity, system frame number, etc.
  • the SS blocks may be organized into SS bursts to support beam sweeping.
  • Further system information such as, remaining minimum system information (RMSI) , system information blocks (SIBs) , other system information (OSI) can be transmitted on a physical downlink shared channel (PDSCH) in certain subframes.
  • the SS block can be transmitted up to sixty-four times, for example, with up to sixty-four different beam directions for mmW.
  • the up to sixty-four transmissions of the SS block are referred to as the SS burst set.
  • SS blocks in an SS burst set are transmitted in the same frequency region, while SS blocks in different SS bursts sets can be transmitted at different frequency locations.
  • the SS blocks may be organized into SS burst sets to support beam sweeping. As shown, each SSB within a burst set may be transmitted using a different beam, which may help a UE quickly acquire both transmit (Tx) and receive (Rx) beams (particular for mmW applications) .
  • a physical cell identity (PCI) may still decoded from the PSS and SSS of the SSB.
  • a control resource set (CORESET) for systems may comprise one or more control resource (e.g., time and frequency resources) sets, configured for conveying PDCCH, within the system bandwidth.
  • control resource e.g., time and frequency resources
  • one or more search spaces e.g., common search space (CSS) , UE-specific search space (USS) , etc.
  • a CORESET is a set of time and frequency domain resources, defined in units of resource element groups (REGs) .
  • Each REG may comprise a fixed number (e.g., twelve) tones in one symbol period (e.g., a symbol period of a slot) , where one tone in one symbol period is referred to as a resource element (RE) .
  • a fixed number of REGs may be included in a control channel element (CCE) .
  • Sets of CCEs may be used to transmit new radio PDCCHs (NR-PDCCHs) , with different numbers of CCEs in the sets used to transmit NR-PDCCHs using differing aggregation levels.
  • Multiple sets of CCEs may be defined as search spaces for UEs, and thus a NodeB or other base station may transmit an NR-PDCCH to a UE by transmitting the NR-PDCCH in a set of CCEs that is defined as a decoding candidate within a search space for the UE, and the UE may receive the NR-PDCCH by searching in search spaces for the UE and decoding the NR-PDCCH transmitted by the NodeB.
  • CSI-RS Channel State Measurement
  • RS Reference Signal
  • CSI-RS channel state information reference signal
  • CSI-RS patterns may be configured such that CSI-RSs for a first radio access technology do not collide with data or control resource elements (REs) for a second radio access technology.
  • REs control resource elements
  • FIG. 4 illustrates example spectrum usage for deployments of a first radio access technology (RAT) and a second RAT.
  • Deployment 400 illustrates an example deployment of a first RAT in which a first operator uses the 2110-2130 MHz frequency range for frequency domain duplexed (FDD) downlink communications and the 1920-1940 MHz frequency range for FDD uplink communications.
  • a second operator may use the 2130-2155 MHz frequency range for FDD downlink communications and the 1940-1965 MHz frequency range for FDD uplink communications.
  • Deployment 410 illustrates example deployments in which a first RAT and a second RAT are deployed in a dynamic spectrum sharing arrangement for FDD downlink communications.
  • a first operator may deploy a first RAT (e.g., a non-legacy RAT) and a second RAT (e.g., a legacy RAT) on the same frequency band (e.g., on the 20 MHz bandwidth between 2110-2130 MHz) using dynamic spectrum sharing, with a synchronization signal block (SSB) and CORESET deployment for the first RAT within a frequency band of the second operator.
  • SSB synchronization signal block
  • collisions between the SSB and CORESET for the first RAT may not collide with signals of a second RAT in the 20 MHz bandwidth of the first operator.
  • the physical downlink shared channel (PDSCH) and the CSI-RS for the first RAT may use resources located within the 20 MHz bandwidth of the first operator. Collisions may be voided between the PDSCH or demodulation reference signal (DMRS) for the first RAT and cell-specific reference signals (CRS) or physical broadcast channel/synchronization signals for the second RAT. Further, zero power (ZP) CSI-RSs for the second RAT may be leveraged to avoid partial collisions of CSI-RS patterns for the first RAT with the PDSCH and/or CRS for the second RAT.
  • DMRS demodulation reference signal
  • CRS cell-specific reference signals
  • ZP zero power
  • FIG. 5 illustrates an example resource element configurations for transmitting CSI-RSs for a first radio access technology (RAT) in resource elements configured for a second RAT.
  • the MBSFN subframe may not be used for legacy RAT scheduling, as the overhead experienced by traffic on the legacy RAT may be prohibitive for short periodicity.
  • Transmission of CSI-RSs using a 10 ms CSI-RS periodicity may impose a CSI-RS overhead of 10 percent, while transmission of CSI-RSs using a 4 ms CSI periodicity may impose a CSI-RS overhead of 25%.
  • zero (ZP) CSI-RS resources for the legacy RAT may be used for CSI-RSs for a non-legacy RAT, which may be suitable for short CSI-RS periodicity.
  • the ZP CSI-RS resources for the legacy RAT that may be used for non-legacy CSI-RS patterns are illustrate in locations 502, 504, 506, 508, and 510 in the subframe illustrated in FIG. 5. Because the ZP CSI-RS resources at locations 502, 504, 506, 508, and 510 are resources on which no signal is transmitted by devices using the legacy RAT, devices using the non-legacy RAT can transmit signaling at these locations without colliding with other data or control REs. However, not all non-legacy CSI-RS patterns may be placed on these ZP CSI-RS resources without colliding with other data or control resource elements.
  • FIG. 6 illustrates an example of CSI-RS pattern structures.
  • the resource element for an X-port CSI-RS resource spans a number of OFDM symbols in the same slot comprising one or multiple component CSI-RS resource element (RE) patterns.
  • a component CSI-RS RE pattern may be defined within a single physical resource block (PRB) as Y adjacent REs in the frequency domain and Z adjacent REs in the time domain.
  • PRB physical resource block
  • a non-legacy RAT such as NR, may support non-adjacent mappings of CSI-RS components in the frequency domain.
  • REs in each individual CSI-RS component may be adjacent, as discussed above; however, individual CSI-RS components in a CSI-RS pattern need not be adjacent in time and/or frequency.
  • extended cyclic prefix CSI-RSs may reuse normal cyclic prefix CSI-RS resources.
  • CDM code division multiplexed
  • FIG. 8 illustrates example collisions between patterns for first type of CSI-RS for a first RAT and data and control signals for a second RAT.
  • NZP non-zero-power
  • ZP zero-power
  • the CSI-RS components that collide with data and control signaling for the second RAT are outlined in bold boxes in each of patterns 802, 804, 806, 808, 810, and 812.
  • Patterns 802, 804, and 806 represent examples of 24-port CSI-RS patterns in which three blocks of REs collide with data or control REs for the second RAT.
  • Patterns 808, 810, and 812 represent examples of 32-port CSI-RS patterns in which four blocks of REs collide with data or control REs for the second RAT.
  • different CSI-RS components may be placed anywhere within a resource block.
  • these components may be placed anywhere in a slot.
  • the horizontal axis represents REs in the time domain
  • the vertical axis illustrates REs in the frequency domain.
  • FIG. 9 illustrates example operations 900 that may be performed by a network entity to configure CSI-RS patterns for a first radio access technology for coexistence with a second radio access technology in dynamic spread spectrum environments, according to certain aspects of the present disclosure.
  • Operations 900 may be performed, for example, by a base station 110 illustrated in FIG. 1 (e.g., a gNB DU/CU) to transmit CSI-RSs to a UE for the UE to measure and generate a CSI report.
  • a base station 110 illustrated in FIG. 1 e.g., a gNB DU/CU
  • Operations 900 begin, at block 902, where the network entity configures a set of resource elements (REs) for transmitting a first type of channel state information (CSI) reference signal (RS) (CSI-RS) on REs reserved for a second type of CSI-RS such that the first type of CSI-RS does not collide with data or control REs.
  • REs resource elements
  • CSI-RS channel state information reference signal
  • the network entity transmits, to a user equipment (UE) , the first type of CSI-RS on the identified set of REs.
  • UE user equipment
  • the network entity receives, from the UE, a CSI report based on the transmitted first type of CSI-RS.
  • FIG. 10 illustrates example operations 1000 that may considered complementary to operations 900 of FIG. 9.
  • operations 1000 may be performed by a UE (e.g., a UE 120 illustrated in FIG. 1) to receive CSI-RSs according to a CSI-RS pattern and generate a measurement report based on the received CSI-RSs.
  • a UE e.g., a UE 120 illustrated in FIG. 1
  • receive CSI-RSs according to a CSI-RS pattern and generate a measurement report based on the received CSI-RSs.
  • Operations 1000 begin, at 1002, where the UE receives, from a network entity, a configuration of a set of resource elements (REs) on which a first type of channel state information (CSI) reference signal (RS) is to be transmitted.
  • the set of REs may comprise REs reserved for a second type of CSI-RS such that the first type of CSI-RS does not collide with data or control REs.
  • the UE receives the first type of CSI-RS on the identified set of REs.
  • the UE generates a CSI report based on the received first type of CSI-RS.
  • the UE transmits the CSI report to the network entity.
  • FIG. 11 illustrates an example configuration for a first type of CSI-RS for a first RAT that does not collide with data or control REs for a second RAT, in accordance with certain aspects of the present disclosure.
  • Table 1100 illustrates example codings for 24-port CSI-RS patterns that do not collide with data or control REs.
  • the first type of CSI-RS may result in a plurality of code division multiplexed CSI-RSs being transmitted on REs reserved for the second type of CSI-RS.
  • these codings may result in the first type of CSI-RS being transmitted on a first RAT (e.g., a non-legacy RAT such as NR) using a portion of the bandwidth used for configuring the second type of CSI-RS on a second RAT (e.g., a legacy RAT such as LTE) .
  • a first RAT e.g., a non-legacy RAT such as NR
  • a second RAT e.g., a legacy RAT such as LTE
  • Patterns 1102, 1104, 1106, and 1108 illustrate various examples of CSI-RS groups transmitted on resources such that the CSI-RSs do not collide with data or control signals.
  • patterns 1102 and 1104 may result in CSI-RS groups being transmitted on NZP CSI-RS resources 502 illustrated in FIG. 5 and described above. In these patterns, the CSI-RSs may be transmitted on a contiguous group of time and frequency resources.
  • Patterns 1106 and 1108 may result in CSI-RS groups being transmitted on NZP CSI-RS resources 502, 508, and 510, as illustrated in FIG. 5 and described above. In these patterns, the CSI-RSs may be transmitted on discontinuous groups of time and frequency resources.
  • CSI-RSs may be configured for transmission on ZP CSI-RS resources, or resources on which devices using a second RAT may not transmit any signaling at all, and CSI-RSs may not be transmitted on data or control REs, such as PDSCH and PDCCH REs for a legacy RAT.
  • FIG. 12 illustrates an example configuration for a first type of CSI-RS for a first RAT that does not collide with data or control REs for a second RAT, in accordance with certain aspects of the present disclosure.
  • Table 1200 illustrates example codings for 32-port CSI-RS patterns that do not collide with data or control REs.
  • the first type of CSI-RS may result in a plurality of code division multiplexed CSI-RSs being transmitted on REs reserved for the second type of CSI-RS.
  • these codings may result in the first type of CSI-RS being transmitted on a first RAT (e.g., a non-legacy RAT such as NR) using a portion of the bandwidth used for configuring the second type of CSI-RS on a second RAT (e.g., a legacy RAT such as LTE) .
  • a first RAT e.g., a non-legacy RAT such as NR
  • a second RAT e.g., a legacy RAT such as LTE
  • Patterns 1202, 1204, 1206, and 1208 illustrate various examples of CSI-RS groups transmitted on resources such that the CSI-RSs do not collide with data or control signals. As illustrated, patterns 1202 and 1204 may result in CSI-RS groups being transmitted on NZP CSI-RS resources 502, 508, and 510 illustrated in FIG. 5 and described above. Patterns 1206 and 1208 may result in CSI-RS groups being transmitted on NZP CSI-RS resources 502, 504, 506, 508, and 510, as illustrated in FIG. 5 and described above. Like the 24-port patterns discussed above, CSI-RSs may be configured for transmission on ZP CSI-RS resources, or resources on which devices using a second RAT may not transmit any signaling at all.
  • NR for example, 5G NR
  • LTE Long Term Evolution
  • LTE-A LTE-Advanced
  • CDMA code division multiple access
  • TDMA time division multiple access
  • FDMA frequency division multiple access
  • OFDMA orthogonal frequency division multiple access
  • SC-FDMA single-carrier frequency division multiple access
  • TD-SCDMA time division synchronous code division multiple access
  • a CDMA network may implement a radio technology such as Universal Terrestrial Radio Access (UTRA) , cdma2000, etc.
  • UTRA Universal Terrestrial Radio Access
  • UTRA includes Wideband CDMA (WCDMA) and other variants of CDMA.
  • cdma2000 covers IS-2000, IS-95 and IS-856 standards.
  • a TDMA network may implement a radio technology such as Global System for Mobile Communications (GSM) .
  • GSM Global System for Mobile Communications
  • An OFDMA network may implement a radio technology such as NR (e.g. 5G RA) , Evolved UTRA (E-UTRA) , Ultra Mobile Broadband (UMB) , IEEE 802.11 (Wi-Fi) , IEEE 802.16 (WiMAX) , IEEE 802.20, Flash-OFDMA, etc.
  • NR e.g. 5G RA
  • E-UTRA Evolved UTRA
  • UMB Ultra Mobile Broadband
  • IEEE 802.11 Wi-Fi
  • IEEE 802.16 WiMAX
  • IEEE 802.20 Flash-OFDMA
  • UTRA and E-UTRA are part of Universal Mobile Telecommunication System (UMTS) .
  • LTE and LTE-A are releases of UMTS that use E-UTRA.
  • UTRA, E-UTRA, UMTS, LTE, LTE-A and GSM are described in documents from an organization named “3rd Generation Partnership Project” (3GPP) .
  • cdma2000 and UMB are described in documents from an organization named “3rd Generation Partnership Project 2” (3GPP2) .
  • NR is an emerging wireless communications technology under development.
  • the term “cell” can refer to a coverage area of a Node B (NB) or a NB subsystem serving this coverage area, depending on the context in which the term is used.
  • NB Node B
  • BS next generation NodeB
  • AP access point
  • DU distributed unit
  • TRP transmission reception point
  • a BS may provide communication coverage for a macro cell, a pico cell, a femto cell, or other types of cells.
  • a macro cell may cover a relatively large geographic area (for example, several kilometers in radius) and may allow unrestricted access by UEs with service subscription.
  • a pico cell may cover a relatively small geographic area and may allow unrestricted access by UEs with service subscription.
  • a femto cell may cover a relatively small geographic area (for example, a home) and may allow restricted access by UEs having an association with the femto cell (for example, UEs in a Closed Subscriber Group (CSG) , UEs for users in the home, etc. ) .
  • a BS for a macro cell may be referred to as a macro BS.
  • a BS for a pico cell may be referred to as a pico BS.
  • a BS for a femto cell may be referred to as a femto BS or a home BS.
  • a UE may also be referred to as a mobile station, a terminal, an access terminal, a subscriber unit, a station, a Customer Premises Equipment (CPE) , a cellular phone, a smart phone, a personal digital assistant (PDA) , a wireless modem, a wireless communication device, a handheld device, a laptop computer, a cordless phone, a wireless local loop (WLL) station, a tablet computer, a camera, a gaming device, a netbook, a smartbook, an ultrabook, an appliance, a medical device or medical equipment, a biometric sensor/device, a wearable device such as a smart watch, smart clothing, smart glasses, a smart wrist band, smart jewelry (for example, a smart ring, a smart bracelet, etc.
  • CPE Customer Premises Equipment
  • PDA personal digital assistant
  • WLL wireless local loop
  • MTC machine-type communication
  • eMTC evolved MTC
  • MTC and eMTC UEs include, for example, robots, drones, remote devices, sensors, meters, monitors, location tags, etc., that may communicate with a BS, another device (for example, remote device) , or some other entity.
  • a wireless node may provide, for example, connectivity for or to a network (for example, a wide area network such as Internet or a cellular network) via a wired or wireless communication link.
  • a network for example, a wide area network such as Internet or a cellular network
  • Some UEs may be considered Internet-of-Things (IoT) devices, which may be narrowband IoT (NB-IoT) devices.
  • IoT Internet-of-Things
  • NB-IoT narrowband IoT
  • Some wireless networks utilize orthogonal frequency division multiplexing (OFDM) on the downlink and single-carrier frequency division multiplexing (SC-FDM) on the uplink.
  • OFDM and SC-FDM partition the system bandwidth into multiple (K) orthogonal subcarriers, which are also commonly referred to as tones, bins, etc.
  • K orthogonal subcarriers
  • Each subcarrier may be modulated with data.
  • modulation symbols are sent in the frequency domain with OFDM and in the time domain with SC-FDM.
  • the spacing between adjacent subcarriers may be fixed, and the total number of subcarriers (K) may be dependent on the system bandwidth.
  • the spacing of the subcarriers may be 15 kHz and the minimum resource allocation (called a “resource block” (RB) ) may be 12 subcarriers (or 180 kHz) . Consequently, the nominal Fast Fourier Transfer (FFT) size may be equal to 128, 256, 512, 1024 or 2048 for system bandwidth of 1.25, 2.5, 5, 10, or 20 megahertz (MHz) , respectively.
  • the system bandwidth may also be partitioned into subbands. For example, a subband may cover 1.08 MHz (for example, 6 RBs) , and there may be 1, 2, 4, 8, or 16 subbands for system bandwidth of 1.25, 2.5, 5, 10 or 20 MHz, respectively.
  • the basic transmission time interval (TTI) or packet duration is the 1 ms subframe.
  • NR may utilize OFDM with a CP on the uplink and downlink and include support for half-duplex operation using TDD.
  • a subframe is still 1 ms, but the basic TTI is referred to as a slot.
  • a subframe contains a variable number of slots (for example, 1, 2, 4, 8, 16, ...slots) depending on the subcarrier spacing.
  • the NR RB is 12 consecutive frequency subcarriers.
  • NR may support a base subcarrier spacing of 15 KHz and other subcarrier spacing may be defined with respect to the base subcarrier spacing, for example, 30 kHz, 60 kHz, 120 kHz, 240 kHz, etc.
  • the symbol and slot lengths scale with the subcarrier spacing.
  • the CP length also depends on the subcarrier spacing. Beamforming may be supported and beam direction may be dynamically configured. MIMO transmissions with precoding may also be supported. In some examples, MIMO configurations in the DL may support up to 8 transmit antennas with multi-layer DL transmissions up to 8 streams and up to 2 streams per UE. In some examples, multi-layer transmissions with up to 2 streams per UE may be supported. Aggregation of multiple cells may be supported with up to 8 serving cells.
  • a scheduling entity (for example, a BS) allocates resources for communication among some or all devices and equipment within its service area or cell.
  • the scheduling entity may be responsible for scheduling, assigning, reconfiguring, and releasing resources for one or more subordinate entities. That is, for scheduled communication, subordinate entities utilize resources allocated by the scheduling entity.
  • Base stations are not the only entities that may function as a scheduling entity.
  • a UE may function as a scheduling entity and may schedule resources for one or more subordinate entities (for example, one or more other UEs) , and the other UEs may utilize the resources scheduled by the UE for wireless communication.
  • a UE may function as a scheduling entity in a peer-to-peer (P2P) network, or in a mesh network.
  • P2P peer-to-peer
  • UEs may communicate directly with one another in addition to communicating with a scheduling entity.
  • determining may encompass one or more of a wide variety of actions. For example, “determining” may include calculating, computing, processing, deriving, investigating, looking up (for example, looking up in a table, a database or another data structure) , assuming and the like. Also, “determining” may include receiving (for example, receiving information) , accessing (for example, accessing data in a memory) and the like. Also, “determining” may include resolving, selecting, choosing, establishing and the like.
  • a or b may include a only, b only, or a combination of a and b.
  • a phrase referring to “at least one of” or “one or more of” a list of items refers to any combination of those items, including single members.
  • “at least one of: a, b, or c” is intended to cover the possibilities of: a only, b only, c only, a combination of a and b, a combination of a and c, a combination of b and c, and a combination of a and b and c.

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  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
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Abstract

Des aspects de la présente divulgation concernent des communications sans fil et, plus particulièrement, des techniques permettant de configurer des motifs CSI-RS pour une coexistence entre différentes technologies d'accès radio (RAT) dans un environnement à spectre étalé dynamique. Un procédé donné à titre d'exemple consiste généralement à : configurer un ensemble d'éléments de ressource (RE) permettant de transmettre un premier type de signal de référence (RS) d'informations d'état de canal (CSI) (CSI-RS) sur des RE réservés pour un second type de CSI-RS de façon à ce que le premier type de CSI-RS n'entre pas en collision avec des RE de données ou de commande; transmettre, à un équipement utilisateur (UE), le premier type de CSI-RS sur l'ensemble configuré de RE; et recevoir, de l'UE, un rapport de CSI d'après le premier type de CSI-RS transmis.
PCT/CN2020/108696 2020-08-12 2020-08-12 Configuration de motif de signal de référence (rs) d'informations d'état de canal (csi) (csi-rs) pour une coexistence dans des environnements de partage à spectre dynamique WO2022032524A1 (fr)

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US20200014449A1 (en) * 2015-12-31 2020-01-09 Lg Electronics Inc. Method for reporting csi in wireless communication system and apparatus therefor

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CN107005293A (zh) * 2014-12-02 2017-08-01 三星电子株式会社 用于部分预编码的信道状态信息参考信号和信道状态信息反馈的下行链路信令的方法和装置
CN107431515A (zh) * 2015-03-30 2017-12-01 三星电子株式会社 用于码本设计和信令的方法和装置
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