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EP-3926876-B1 - COMMUNICATION METHOD AND DEVICE

EP3926876B1EP 3926876 B1EP3926876 B1EP 3926876B1EP-3926876-B1

Inventors

  • SHEN, ZUKANG
  • FEI, Yongqiang
  • LONG, Yi
  • GUO, ZHIHENG
  • XIE, Xinqian

Dates

Publication Date
20260506
Application Date
20200121

Claims (16)

  1. A communication method performed by an apparatus, comprising: determining time domain index information corresponding to identification information, wherein the identification information is for identifying a network device, determining a time domain resource of a reference signal that corresponds to the time domain index information in a period, wherein the period is determined based on the identification information, sequence indication information, and frequency domain indication information, the sequence indication information indicates one or more candidate sequences, and the frequency domain indication information indicates one or more candidate frequency domain resources; and sending (S302) the reference signal on transmission resource, wherein the transmission resource comprises a sequence, a frequency domain resource, and a time domain resource of the reference signal.
  2. The method according to claim 1, further comprising: determining, from the candidate sequences, the sequence of the reference signal corresponding to the identification information; and/or determining, from the candidate frequency domain resources, the frequency domain resource corresponding to the identification information.
  3. The method according to claim 1 or 2, wherein the time domain resource is in one or more uplink-downlink switching periods; the time domain resource of the reference signal is determined further based on one or more of first indication information, second indication information, or third indication information; the first indication information indicates a quantity of times of repeatedly sending the reference signal; the second indication information indicates a position, of a symbol that carries the reference signal, in an uplink-downlink switching period; and the third indication information indicates an uplink-downlink switching period that is used for carrying the reference signal and that is in a first uplink-downlink switching period and a second uplink-downlink switching period.
  4. The method according to claim 2, wherein the determining, from the candidate sequences, the sequence of the reference signal corresponding to the identification information comprises: determining sequence index information corresponding to the identification information, and determining, from the candidate sequences, the sequence of the reference signal corresponding to the sequence index information.
  5. The method according to claim 2 or 4, wherein the determining, from the candidate frequency domain resources, the frequency domain resource corresponding to the identification information comprises: determining frequency domain index information corresponding to the identification information, and determining, from the candidate frequency domain resources, the frequency domain resource corresponding to the frequency domain index information.
  6. The method according to any one of claims 1-5, wherein the identification information comprises first identification information and second identification information; the time domain index information comprises first time domain index information and second time domain index information; and the first identification information corresponds to the first time domain index information, and the second identification information corresponds to the second time domain index information; wherein the first time domain index information and the second time domain index information are used to distinguish different reference signal types.
  7. The method according to claim 6, wherein the time domain resource comprises a first time domain resource and a second time domain resource; and the determining the time domain resource of the reference signal that corresponds to the time domain index information in the period comprises: determining the first time domain resource in a first sub-period of the period based on the first time domain index information and a first offset, and/or determining the second time domain resource in a second sub-period of the period based on the second time domain index information and a second offset; wherein the period consists of the first sub-period and the second sub-period, the first offset is determined by the second sub-period, and the second offset is determined by the first sub-period.
  8. The method according to any one of claims 4 to 7, wherein a value of a most significant bit in the sequence index information is determined by interference cancellation state indication information.
  9. A communication method performed by an apparatus, comprising: determining (S303) a receiving resource based on parameter information, wherein the parameter information comprises sequence indication information and frequency domain indication information, the sequence indication information indicates one or more candidate sequences, and the frequency domain indication information indicates one or more candidate frequency domain resources; receiving (S304) a reference signal on the receiving resource; determining a time domain resource of the reference signal in a period, wherein the period is associated with identification information, sequence indication information, and frequency domain indication information, the identification information is used to identify a network device that sends the reference signal; determining time domain index information corresponding to the time domain resource of the reference signal; and determining the identification information based on the time domain index information.
  10. The method according to claim 9, wherein the time domain resource comprises a first time domain resource and a second time domain resource; the identification information comprises first identification information and second identification information; the time domain index information comprises first time domain index information and second time domain index information; and the first time domain index information corresponds to the first identification information, and the second time domain index information corresponds to the second identification information; wherein the first time domain index information and the second time domain index information are used to distinguish different reference signal types.
  11. The method according to claim 9 or 10, wherein the method further comprises: determining one or more of a sequence, a frequency domain resource that correspond to the reference signal; and determining the identification information based on the time domain index information comprising: determining the identification information of the reference signal based on the time domain index information and one or more of a sequence, a frequency domain resource that correspond to the reference signal.
  12. The method according to claim 11, wherein the determining identification information based on the time domain index information and one or more of a sequence, a frequency domain resource that correspond to the reference signal comprises: determining sequence index information based on the sequence of the reference signal, and/or determining frequency domain index information based on the frequency domain resource of the reference signal; and determining the identification information based on the time domain index information and one or more of the sequence index information, the frequency domain index information.
  13. A communications apparatus, configured to perform the method according to any one of claims 1 to 12.
  14. A computer-readable storage medium comprising instructions which, when executed by a computer, cause the computer to carry out the method of any one of claims 1 to 12.
  15. A computer program product comprising instructions which, when executed by a computer, cause the computer to carry out the method of any one of claims 1 to 12.
  16. A chip, wherein the chip is connected to a memory or the chip comprises the memory, and is configured to read and execute instructions stored in the memory, to implement the method according to any one of claims 1 to 12.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS This application claims priority to Chinese Patent Application No. 201910118041.3, filed with the Chinese Patent Office on February 15, 2019 and entitled "COMMUNICATION METHOD AND COMMUNICATIONS APPARATUS. TECHNICAL FIELD Embodiments of this application relate to the field of communications technologies, and in particular, to a communication method and a communications apparatus. BACKGROUND In a wireless communications system in which time division duplex (time division duplex, TDD) is used, for example, in a new radio (new radio, NR) communications system, cross-link interference (cross-link interference, CLI) may be generated between two network devices working at a same frequency. The cross-link interference refers to interference caused by a downlink (downlink, DL) signal sent by one network device to an uplink (uplink, UL) signal received by another network device. An atmospheric duct effect enables a DL signal, sent by a network device, to be transmitted over a long distance, and this is one of causes of the CLI. As shown in FIG. 1, for example, a network device is a base station, and two network devices are represented by a base station 1 and a base station 2. The base station 1 and the base station 2 are geographically far away from each other. Even though the two base stations have a same transmission direction (to be specific, they receive uplink signals simultaneously/send downlink signals simultaneously), there is an obvious delay when a downlink signal sent by the base station 1 arrives at the base station 2. The delay is greater than a guard period (guard period, GP) of uplink-downlink switching of the base station 2, and the base station 2 has switched from a downlink sending direction to an uplink receiving direction. Therefore, the downlink signal sent by the remote base station 1 interferes with an uplink signal received by the local base station 2, that is, remote interference (remote interference, RI) is generated. For interference caused by an atmospheric duct, an interference distance and a delay are affected by a geographical location and weather. Therefore, the interference distance and the delay hold great uncertainties. To resist the remote interference, methods such as reducing a transmit power by using an interfering base station, and reducing a quantity of transmitted downlink symbols by an interfering base station are used. However, before implementing an interference reduction solution, inter-base station measurement needs to be performed, to identify existence of the remote interference, or identify an interfering base station. Currently, the cross-link interference is usually detected by receiving and sending a reference signal (reference signal, RS). A reference signal used for measuring the remote interference may be referred to as a remote interference management reference signal (remote interference management reference signal, RIM-RS). In this process, if an interfering base station sends a RIM-RS, an interfered base station may identify, by receiving or detecting the RIM-RS, the base station that sends the RIM-RS, or if an interfered base station sends a RIM-RS, an interfering base station may identify, by receiving or detecting the RIM-RS, the base station that sends the RIM-RS. However, how to send and receive a RIM-RS is a problem that needs to be resolved. Document "Discussion on RIM-RS configurations" (3GPP Draft R1-1900838) gives the analysis on RIM-RS configuration issues to support RIM operation and provides several proposal and observations. Proposal 1: RIM-RS frequency resource, time domain resource and sequence are implicitly derived from gNB set ID. Proposal 2: RIM RS transmission periodicity is implicit derived from gNB set ID and UL-DL transmission periodicity. Document "Discussion on configuration of RIM RS" (3GPP Draft R1-1900410) provides the discussion on configuration of RIM-RS and provides several proposal and observations. Proposal 9: Given time-domain resource index (ntime), the gNB determines to transmit basic RIM-RS resource of certain RIM-RS configuration at m0-th TDD DL/UL pattern within RIM-RS periodicity Pt, satisfying Mod{m0 - St - ntime · Δt, Pt} = 0, where Pt, St, Δt are configured in the time resource pool IE RIM-RS-ResourceConfig_TimeResourcePool. Document "On RIM RS resource and configurations" (3GPP Draft R1-1900760) discusses the remaining open issues to finalize the normative specification work of the RIM RS resource definition and configurations, including mapping of set ID information and provides several proposal and observations. Observation 2: a certain gNB set transmits all occasions of RS-1 and RS-2 in the same frequency resource. SUMMARY Embodiments of this application provide a communication method and a communications apparatus, to resolve a problem of how to send and receive a RIM-RS during remote interference measurement. Specific technical solutions provided in the embodiments of