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EP-3603252-B1 - DETERMINING A NUMBER OF SYMBOLS FOR SOUNDING REFERENCE SIGNAL TRANSMISSION

EP3603252B1EP 3603252 B1EP3603252 B1EP 3603252B1EP-3603252-B1

Inventors

  • ZHU, CHENXI
  • LING, WEI
  • BROWN, TYLER

Dates

Publication Date
20260506
Application Date
20170324

Claims (14)

  1. A user equipment, UE (102), arranged to perform wireless communication with a base station (104) using an Orthogonal Frequency Division Multiplexing, OFDM, modulation scheme, the UE (102) comprising: a processor (202) arranged to determine a number of OFDM symbols for sounding reference signal, SRS, transmission to the base station (104); and a transmitter (210) arranged to transmit to the base station (104) an indication of the number of OFDM symbols for SRS transmission; wherein the number of OFDM symbols corresponds to a number of SRS ports of the UE (102).
  2. The UE (102) of claim 1, wherein the number of orthogonal frequency-division multiplexing symbols comprises 1, 2, 3, or 4.
  3. The UE (102) of claim 1, wherein, in response to the number of sounding reference signal ports being 1, the number of orthogonal frequency-division multiplexing symbols is 1.
  4. The UE (102) of claim 1, wherein, in response to the number of sounding reference signal ports being 2, the number of orthogonal frequency-division multiplexing symbols is 1 or 2.
  5. The UE (102) of claim 1, wherein, in response to the number of sounding reference signal ports being 4, the number of orthogonal frequency-division multiplexing symbols is 1, 2, 3, or 4.
  6. A method (600) performed or performable by a user equipment, UE (102), the UE (102) arranged to perform wireless communication with a base station (104) using an Orthogonal Frequency Division Multiplexing, OFDM, modulation scheme, the method (600) comprising: determining (602) a number of OFDM symbols for sounding reference signal, SRS, transmission to the base station (104); and transmitting (604) to the base station (104) an indication of the number of OFDM symbols for SRS transmission; wherein the number of OFDM symbols corresponds to a number of SRS ports of the UE (102).
  7. The method (600) of claim 6, wherein the number of orthogonal frequency-division multiplexing symbols comprises 1, 2, 3, or 4.
  8. The method (600) of claim 6, wherein, in response to the number of sounding reference signal ports being 1, the number of orthogonal frequency-division multiplexing symbols is 1.
  9. A base station (104) arranged to perform wireless communication with a user equipment, UE (102), using an Orthogonal Frequency Division Multiplexing, OFDM, modulation scheme, the base unit (104) comprising: a receiver arranged to receive, from the UE (102), an indication of a number of OFDM symbols for sounding reference signal, SRS, transmission; a processor arranged to determine SRS port and resource assignments based on the indication; and a transmitter arranged to transmit, to the UE (102), information indicating the SRS port and resource assignments; wherein the number of OFDM symbols corresponds to a number of SRS ports of the UE (102).
  10. The base unit (104) of claim 9, wherein the number of orthogonal frequency-division multiplexing symbols comprises 1, 2, 3, or 4.
  11. The base station (104) of claim 9, wherein, in response to the number of sounding reference signal ports being 1, the number of orthogonal frequency-division multiplexing symbols is 1.
  12. The base station (104) of claim 9, wherein, in response to the number of sounding reference signal ports being 2, the number of orthogonal frequency-division multiplexing symbols is 1 or 2.
  13. The base station (104) of claim 9, wherein, in response to the number of sounding reference signal ports being 4, the number of orthogonal frequency-division multiplexing symbols is 1, 2, 3, or 4.
  14. A method (700) performed or performable by a base station (104), the base station (104) arranged to perform wireless communication with a user equipment, UE (102), using an Orthogonal Frequency Division Multiplexing, OFDM, modulation scheme, the method (700) comprising: receiving (702), from the UE (102) an indication of a number of OFDM symbols for sounding reference signal, SRS, transmission; determining (704) SRS port and resource assignments based on the indication; and transmitting (706), to the UE (102) information indicating the SRS port and resource assignments; wherein the number of OFDM symbols corresponds to a number of SRS ports of the UE (102).

Description

FIELD The subject matter disclosed herein relates generally to wireless communications and more particularly relates to determining a number of symbols for sounding reference signal transmission. BACKGROUND The following abbreviations are herewith defined, at least some of which are referred to within the following description: Third Generation Partnership Project ("3GPP"), Positive-Acknowledgment ("ACK"), Binary Phase Shift Keying ("BPSK"), Clear Channel Assessment ("CCA"), Cyclic Prefix ("CP"), Channel State Information ("CSI"), Common Search Space ("CSS"), Discrete Fourier Transform Spread ("DFTS"), Downlink Control Information ("DCI"), Downlink ("DL"), Downlink Pilot Time Slot ("DwPTS"), Enhanced Clear Channel Assessment ("eCCA"), Enhanced Mobile Broadband ("eMBB"), Evolved Node B ("eNB"), European Telecommunications Standards Institute ("ETSI"), Frame Based Equipment ("FBE"), Frequency Division Duplex ("FDD"), Frequency Division Multiple Access ("FDMA"), Guard Period ("GP"), Hybrid Automatic Repeat Request ("HARQ"), Internet-of-Things ("IoT"), Key Performance Indicators ("KPI"), Licensed Assisted Access ("LAA"), Load Based Equipment ("LBE"), Listen-Before-Talk ("LBT"), Long Term Evolution ("LTE"), Medium Access Control ("MAC"), Multiple Access ("MA"), Modulation Coding Scheme ("MCS"), Machine Type Communication ("MTC"), Massive MTC ("mMTC"), Multiple Input Multiple Output ("MIMO"), Multi User Shared Access ("MUSA"), Narrowband ("NB"), Negative-Acknowledgment ("NACK") or ("NAK"), Next Generation Node B ("gNB"), Non-Orthogonal Multiple Access ("NOMA"), Orthogonal Frequency Division Multiplexing ("OFDM"), Primary Cell ("PCell"), Physical Broadcast Channel ("PBCH"), Physical Downlink Control Channel ("PDCCH"), Physical Downlink Shared Channel ("PDSCH"), Pattern Division Multiple Access ("PDMA"), Physical Hybrid ARQ Indicator Channel ("PHICH"), Physical Random Access Channel ("PRACH"), Physical Resource Block ("PRB"), Physical Uplink Control Channel ("PUCCH"), Physical Uplink Shared Channel ("PUSCH"), Quality of Service ("QoS"), Quadrature Phase Shift Keying ("QPSK"), Radio Resource Control ("RRC"), Random Access Procedure ("RACH"), Random Access Response ("RAR"), Reference Signal ("RS"), Resource Spread Multiple Access ("RSMA"), Round Trip Time ("RTT"), Receive ("RX"), Sparse Code Multiple Access ("SCMA"), Scheduling Request ("SR"), Sounding Reference Signal ("SRS"), Single Carrier Frequency Division Multiple Access ("SC-FDMA"), Secondary Cell ("SCell"), Shared Channel ("SCH"), Signal-to-Interference-Plus-Noise Ratio ("SINR"), System Information Block ("SIB"), Transport Block ("TB"), Transport Block Size ("TBS"), Time-Division Duplex ("TDD"), Time Division Multiplex ("TDM"), Transmission Time Interval ("TTI"), Transmit ("TX"), Uplink Control Information ("UCI"), User Entity/Equipment (Mobile Terminal) ("UE"), Uplink ("UL"), Universal Mobile Telecommunications System ("UMTS"), Uplink Pilot Time Slot ("UpPTS"), Ultra-reliability and Low-latency Communications ("URLLC"), and Worldwide Interoperability for Microwave Access ("WiMAX"). As used herein, "HARQ-ACK" may represent collectively the Positive Acknowledge ("ACK") and the Negative Acknowledge ("NAK"). ACK means that a TB is correctly received while NAK means a TB is erroneously received. In certain wireless communications networks, a high carrier frequency (e.g., >6GHz) may be used, such as millimeter wave ("mmW"). In such networks, transmission in the mmW range may suffer from higher path loss than the microwave range (e.g., typically with an additional loss of 20 to 30 dB). Without increasing the transmission power, the additional path loss may be compensated by deploying a large number of antenna elements and transmission and reception beamforming at a gNB and a UE. The number of antenna elements at the gNB may be in the order of one hundred or more. Transmission beamforming with a large number of antenna elements may focus the transmission energy in a certain direction (e.g., with a narrow angle) to compensate for additional path loss. In various configurations, a large directional gain may be achieved in the transmission. In some configurations, a large number of antenna elements may be used for transmission in the microwave range in a massive-MIMO system in order to achieve high system capacity. In certain configurations, because of a large number of antenna elements, a cost of implementing an all-digital transceiver may be high. For example, a separate RF chain may be used for each antenna element (e.g., either TX or RX) and the associated cost and power consumption may be prohibitive. In some configurations, a compromise may be to use hybrid analog/digital beamforming in which a small number of radio frequency ("RF") chains may be used to power a large number of antenna elements. Relative phases between certain antenna elements may be controlled by a separate power distribution (at the TX side)/combining (at the RX side) and phase shift network (e