Random access method and apparatus, and electronic device

A random access method, comprising:

• receiving a 2-STEP random access request sent by user equipment;
• wherein the 2-STEP random access request is initiated by the user equipment based on a trigger source;
• or
• the 2-STEP random access request is a 2-STEP random access request configured to request available uplink resources and sent by the user equipment in response to determining that the trigger source is beam failure recovery (BFR) for a secondary cell and there are no the available uplink resources;
• wherein the 2-STEP random access request is one of the following:
• a 2-STEP random access request sent by the user equipment for beam recovery, wherein a network configuration of the user equipment is obtained by the user equipment in response to determining that the trigger source is BFR for a primary cell and/or BFR for a primary secondary cell;
• and 2-STEP random access request is sent by the user equipment for beam recovery in response to determining that the network configuration includes allowance of triggering 2-STEP random access when BFR for the primary cell is triggered and/or BFR for the primary secondary cell is triggered;
• or
• a 2-STEP random access request for requesting available uplink resources, which is sent by the user equipment in response to determining that the trigger source is a scheduling request (SR) and there are no scheduling request resources;
• or
• a 2-STEP random access request for small data transmission (SDT), which is sent by the user equipment in response to determining that the trigger source is SDT and a network configuration of the user equipment includes allowance of the user equipment to trigger 2-STEP random access in inactive state;
• or
• a 2-STEP random access request initiated by the user equipment in response to determining that bandwidth part (BWP) selected to initiate random access is configured with 2-STEP random access resources;
• wherein the user equipment determines that the BWP is configured with 2-STEP random access resources, obtains reference signal received power (RSRP) for downlink path loss reference of the BWP, obtains RSRP threshold corresponding to the trigger source which triggers 2-STEP random access, determines that the RSRP is greater than or equal to the RSRP threshold and initiates 2-STEP random access;
• or
• a 2-STEP random access request sent by the user equipment for requesting available uplink resources, wherein the 2-STEP random access is triggered to request available uplink resources by the user equipment in response to determining that the trigger source is a regular BSR, and determining that there are no the available uplink resources or present available uplink resources to meet logical channel prioritization (LCP) mapping restriction of a logical channel triggering the regular BSR;
• or
• a 2-STEP random access request sent by the user equipment for the SDT, wherein data radio bearer (DRB) that triggers SDT is obtained by the user equipment in response to determining that the trigger source is the SDT;
• and 2-STEP random access is triggered for SDT by the user equipment in response to determining that a network configuration of the user equipment includes the DRB or the logical channel corresponding to the DRB being configured with 2-STEP random access or hybrid automatic repeat request (HARQ) with uplink (UL) retransmission disabled;
• and
• wherein the random access method further comprises:
• receiving a 4-STEP random access request initiated by the user equipment, wherein the 4-STEP random access request is a 4-STEP random access request initiated by user equipment in response to determining that BWP selected to initiate random access is not configured with 2-STEP random access resources.

An electronic device, comprising:

• at least one processor;
• and
• a memory communicatively connected to the at least one processor, wherein
• the memory stores instructions executable by the at least one processor, and when the instructions are executed by the at least one processor, the at least one processor is configured to:
• determine a trigger source for 2-STEP random access;
• and
• according to the trigger source for the 2-STEP random access, trigger 2-STEP random access correspondingly;
• wherein triggering 2-STEP random access comprises:
• determining that the trigger source is beam failure recovery (BFR) for a secondary cell and there are no available uplink resources;
• and
• triggering the 2-STEP random access to request available uplink resources;
• wherein triggering 2-STEP random access comprises one of the following:
• determining that the trigger source is BFR for a primary cell and/or BFR for a primary secondary cell, and obtaining a network configuration of user equipment;
• and determining that the network configuration includes allowance of triggering 2-STEP random access when BFR for the primary cell is triggered and/or BFR for the primary secondary cell is triggered, and triggering 2-STEP random access for beam recovery;
• or
• determining that the trigger source is a regular buffer status report (BSR) and determining that there are no available uplink resources or failure of present available uplink resources to meet logical channel prioritization (LCP) mapping restriction of a logical channel, and triggering 2-STEP random access to request available uplink resources;
• or
• determining that the trigger source is a scheduling request (SR) and there are no available uplink resources, and triggering 2-STEP random access to obtain available uplink resources;
• or
• determining that the trigger source is small data transmission (SDT), and obtaining data radio bearer (DRB) that triggers the SDT;
• and determining that a network configuration of user equipment includes the DRB or a logical channel corresponding to the DRB being configured with 2-STEP random access or hybrid automatic repeat request (HARQ) with uplink (UL) retransmission disabled, and triggering 2-STEP random access for SDT;
• or
• determining that the trigger source is SDT, and obtaining a network configuration of user equipment;
• and determining that the network configuration includes allowance of the user equipment to trigger 2-STEP random access in inactive state, and triggering 2-STEP random access for SDT:
• wherein the random access method further comprises:
• obtaining a bandwidth part (BWP) selected by user equipment to initiate random access;
• determining that the BWP is configured with 2-STEP random access resources, obtaining reference signal received power (RSRP) for downlink path loss reference of the BWP, obtaining RSRP threshold corresponding to the trigger source which triggers 2-STEP random access, determining that the RSRP is greater than or equal to the RSRP threshold and initiating 2-STEP random access;
• or
• determining that the BWP is not configured with the 2-STEP random access resources, and initiating 4-STEP random access.