Random access method and device, electronic device and computer-readable storage medium

Patent metadata

Field	Value
Publication number	US-12089256-B2
Application number	US-201817261867-A
Country	US
Kind code	B2
Filing date	Jul 25, 2018
Priority date	Jul 25, 2018
Publication date	Sep 10, 2024
Grant date	Sep 10, 2024

Abstract

A random access method includes: when initiating random access, determining a measurement result of channel state information measurement reference signals (CSI-RS) of a plurality of beams; determining a target beam corresponding to a target CSI-RS having a measurement result greater than a preset threshold value; determining a target Synchronization Signal Block (SSB) corresponding to the target CSI-RS; determining a random access preamble and random access timing associated with the target SSB; and initiating random access on the target beam based on the random access preamble and the random access timing. A beam can be determined according to the measurement result of an CSI-RS, without determining the beam according to the measurement result of an SSB, thereby preventing the problem of user equipment (UE) being unable to select a suitable beam for random access due to a measurement result of an SSB not being obtained for a downlink BWP by UE.

First claim

What is claimed is:

1. A random access method, comprising:
in response to initiating a random access, determining measurement results of Channel State Information Reference Signals (CSI-RS) of a plurality of beams;
determining a target beam corresponding to a target CSI-RS of which the measurement result is greater than a preset threshold;
determining a target synchronization signal block (SSB) corresponding to the target CSI-RS;
determining a random access preamble and a random access occasion associated with the target SSB; and
initiating the random access on the target beam based on the random access preamble and the random access occasion;
wherein the method further comprises, before determining the measurement results of CSI-RSs of the plurality of beams, determining whether there is an available measurement result of an SSB in a downlink bandwidth part corresponding to the initiated random access; and
wherein in response to there is no available measurement result of the SSB in the downlink bandwidth part corresponding to the initiated random access, the method further comprises determining the measurement results of the CSI-RSs of the plurality of beams,
wherein in response to that the initiated random access is a non-contention random access triggered due to beam failure recovery (BFR), and a reference signal resource of a candidate beam of the BFR is the SSB, said determining whether there is the available measurement result of the SSB in the downlink bandwidth part corresponding to the initiated random access comprising:
determining whether there is an available measurement result of the SSB in a downlink bandwidth part corresponding to the initiated non-contention random access;
wherein, in response to there is no available measurement result of the SSB in the downlink bandwidth part corresponding to the initiated non-contention random access, said determining the measurement results of the CSI-RSs of the plurality of beams comprising:
determining the measurement result of the CSI-RS associated with the SSB corresponding to the candidate beam.

2. The method according to claim 1 , wherein said determining the target SSB corresponding to the target CSI-RS comprising:
determining a target SSB that is quasi-colocated with the target CSI-RS.

3. The method according to claim 2 , wherein said determining the target SSB quasi-colocated with the target CSI-RS comprising:
determining a target SSB that is quasi-colocated with a spatial reception parameter of the target CSI-RS.

4. The method according to claim 1 , wherein said determining the target SSB corresponding to the target CSI-RS comprising:
determining the target SSB corresponding to the target CSI-RS according to an association relationship between the CSI-RS and the SSB configured by a base station.

5. The method according to claim 1 , wherein the preset threshold is determined based on a radio resource control message sent by a base station.

6. An electronic device, comprising:
a processor; and
memory for storing instructions executable by the processor;
wherein the processor is configured to:
in response to initiating a random access, determine measurement results of Channel State Information Reference Signals (CSI-RS) of a plurality of beams;
determine a target beam corresponding to a target CSI-RS of which the measurement result is greater than a preset threshold;
determine a target synchronization signal block (SSB) corresponding to the target CSI-RS;
determine a random access preamble and a random access occasion associated with the target SSB;
initiate the random access on the target beam based on the random access preamble and the random access occasion;
before determining the measurement results of CSI-RSs of the plurality of beams, determine whether there is an available measurement result of an SSB in a downlink bandwidth part corresponding to the initiated random access; and
in response to there is no available measurement result of the SSB in the downlink bandwidth part corresponding to the initiated random access, determine the measurement results of the CSI-RSs of the plurality of beams,
wherein in response to that the initiated random access is a non-contention random access triggered due to beam failure recovery (BFR), and a reference signal resource of a candidate beam of the BFR is the SSB, the processor is further configured to:
determine whether there is an available measurement result of the SSB in a downlink bandwidth part corresponding to the initiated non-contention random access; and
in response to there is no available measurement result of the SSB in the downlink bandwidth part corresponding to the initiated non-contention random access, determine the measurement result of the CSI-RS associated with the SSB corresponding to the candidate beam.

7. The electronic device according to claim 6 , wherein the processor is further configured to:
determine a target SSB that is quasi-colocated with the target CSI-RS.

8. The electronic device according to claim 6 , wherein the processor is further configured to:
determine a target SSB that is quasi-colocated with a spatial reception parameter of the target CSI-RS.

9. The electronic device according to claim 6 , wherein the processor is further configured to:
determine the target SSB corresponding to the target CSI-RS according to an association relationship between the CSI-RS and the SSB configured by a base station.

10. The electronic device according to claim 6 , wherein the preset threshold is determined based on a radio resource control message sent by a base station.

11. The electronic device according to claim 6 , the electronic device is configured to determine the beam according to the measurement result of the CSI-RS without determining the beam according to the measurement result of the SSB, thereby preventing the user equipment from failing to select a suitable beam to perform the random access resulting from the user equipment being unable to obtain the measurement result of the SSB for the downlink BWP, and ensuring that the user equipment selects a suitable beam that meets communication requirements.

12. The electronic device according to claim 11 , wherein the random access preamble and the random access occasion are not directly related to the CSI-RS, but are directly related to the SSB, such that the SSB corresponding to the CSI-RS is further determined after the beam is determined, and then the random access preamble and random access occasion associated with the SSB are determined, thereby enabling the user equipment to send the random access preamble to a base station at the random access occasion based on the beam that meets the communication requirements, and ensuing a smooth progress of random access.

Assignees

• Beijing Xiaomi Mobile Software Co Ltd

Inventors

• Jiang Xiaowei
• Zhang Ming

Classifications

• H04W72/046

  the resource being in the space domain, e.g. beams · CPC title

• H04W74/0833 Primary

  Random access procedures, e.g. with 4-step access · CPC title

• H04W74/0838

  using contention-free random access [CFRA] · CPC title

• H04L5/0048

  Allocation of pilot signals, i.e. of signals known to the receiver (allocation of control signalling H04L5/0053; use of control signalling H04L5/0091) · CPC title