CN-122028180-A - Communication method, device and readable storage medium

Abstract

The embodiment of the application provides a communication method, a communication device and a readable storage medium. The method mainly comprises the steps of sending a random access request message, receiving a random access response message, wherein the random access response message comprises beam indication information, and sending a connection establishment message according to the beam indication information. By implementing the embodiment of the application, the optimal sending beam of the connection establishment message can be indicated through the random access response message, so that the performance loss can be avoided, and the communication quality can be improved.

Inventors

• YANG PEI
• YU ZHENG

Assignees

• 华为技术有限公司

Dates

Publication Date

20260512

Application Date

20241111

Claims (20)

1. 1. A method of communication, comprising: Sending a random access request message; Receiving a random access response message, wherein the random access response message comprises beam indication information; and sending a connection establishment message according to the beam indication information.
2. 2. The method of claim 1, wherein the beam indication information is used to indicate a transmit beam, and wherein the sending the connection setup message according to the beam indication information comprises: and determining a transmitting beam according to the beam indication information, and transmitting the connection establishment message by using the transmitting beam.
3. 3. The method of claim 2, wherein the random access request message comprises a random access preamble index value, the random access response message comprises a medium access control protocol data unit, MAC PDU, the MAC PDU comprising at least one medium access control sub-protocol data unit MAC subPDU and a beam indication field, the determining a transmit beam according to the beam indication information comprising: determining MAC subPDU corresponding to the random access request message and position information of MAC subPDU in the MAC PDU according to the random access preamble index value; based on the location information, the beam indication field, and the number of beams, a transmit beam is determined.
4. 4. A method according to any of claims 1 to 3, wherein prior to said sending a random access request message, the method further comprises: Receiving configuration information, wherein the configuration information comprises the number of beams corresponding to the connection establishment message, or The configuration information comprises the mapping relation between the beam quantity corresponding to the connection establishment message and the random access request message sending times.
5. 5. The method of claim 1 or 2, wherein the random access response message includes beam indication information, comprising: the random access response message includes a MAC PDU including at least one first MAC subPDU, the first MAC subPDU including a sub-header containing a T field including the beam indication information.
6. 6. The method of claim 5, wherein the MAC PDU further comprises a second MAC subPDU, the second MAC subPDU is a first one MAC subPDU of the MAC PDUs, and the T field of the second MAC subPDU indicates whether the second MAC subPDU contains a back-off indication BI.
7. 7. The method of claim 1, 5 or 6, wherein the random access response message includes beam indication information, comprising: The random access response message includes a MAC PDU including at least one MAC subPDU, the MAC subPDU includes a sub-header and a medium access control random access response MAC RAR, the MAC RAR includes an R field, and the R field includes the beam indication information.
8. 8. The method of claim 1, 5, 6 or 7, wherein the random access response message includes beam indication information, comprising: The random access response message includes a MAC PDU including at least one MAC subPDU, the MAC subPDU includes a sub-header and a medium access control random access response MAC RAR, the MAC RAR includes a time advance command field, and the time advance command field includes the beam indication information.
9. 9. The method of claim 1, 5, 6, 7 or 8, wherein the random access response message includes beam indication information, comprising: The random access response message includes a MAC PDU including at least one MAC subPDU, the MAC subPDU includes a sub-header and a medium access control random access response MAC RAR, the MAC RAR includes a time uplink scheduling information field, and the uplink scheduling information field includes the beam indication information.
10. 10. The method of claim 1 or 2, wherein the method further comprises: And receiving downlink control information, wherein the downlink control information is used for scheduling retransmission of a connection establishment message, the downlink control information comprises a new data indication field and a hybrid automatic repeat request (HARQ) process number field, and the new data indication field and/or the HARQ process number field comprise the beam indication information.
11. 11. The method of claim 10, wherein the new data indication field includes beam switching information indicating whether a transmit beam of the current connection setup message is identical to a transmit beam of the first connection setup message, and wherein the transmit beam is determined according to the HARQ process number field when the transmit beam of the current connection setup message is not identical to the transmit beam of the first connection setup message.
12. 12. The method of claim 1 or 2, wherein the method further comprises: And receiving a physical layer downlink control channel (PDCCH), wherein the PDCCH is used for scheduling a physical layer downlink shared channel (PDSCH), the PDCCH comprises a reserved bit field, the reserved bit field comprises the beam indication information, and the PDSCH comprises the random access response message.
13. 13. A method of communication, comprising: Receiving a random access request message; according to the random access request message, a random access response message is sent, wherein the random access response message comprises beam indication information; And receiving a connection establishment message through the beam indicated by the beam indication information.
14. 14. The method of claim 13, wherein the random access response message comprises a MAC PDU comprising at least one MAC subPDU and a beam indication field.
15. 15. The method of claim 13 or 14, wherein prior to the receiving the random access request message, the method further comprises: transmitting configuration information, wherein the configuration information comprises the number of beams corresponding to the connection establishment message, or The configuration information comprises the mapping relation between the beam quantity corresponding to the connection establishment message and the random access request message sending times.
16. 16. The method of claim 13, wherein the random access response message includes beam indication information, comprising: the random access response message includes a MAC PDU including at least one first MAC subPDU, the first MAC subPDU including a sub-header containing a T field including the beam indication information.
17. 17. The method of claim 16, wherein the MAC PDU further comprises a second MAC subPDU, the second MAC subPDU is a first one MAC subPDU of the MAC PDUs, and the T field of the second MAC subPDU indicates whether the second MAC subPDU contains a back-off indication BI.
18. 18. The method of claim 13, 16 or 17, wherein the random access response message includes beam indication information, comprising: The random access response message includes a MAC PDU including at least one MAC subPDU, the MAC subPDU includes a sub-header and a medium access control random access response MAC RAR, the MAC RAR includes an R field, and the R field includes the beam indication information.
19. 19. The method of claim 13, 16, 17 or 18, wherein the random access response message includes beam indication information, comprising: The random access response message includes a MAC PDU including at least one MAC subPDU, the MAC subPDU includes a sub-header and a medium access control random access response MAC RAR, the MAC RAR includes a time advance command field, and the time advance command field includes the beam indication information.
20. 20. The method of claim 13, 16, 17, 18 or 19, wherein the random access response message includes beam indication information, comprising: The random access response message includes a MAC PDU including at least one MAC subPDU, the MAC subPDU includes a sub-header and a medium access control random access response MAC RAR, the MAC RAR includes a time uplink scheduling information field, and the uplink scheduling information field includes the beam indication information.

Description

Communication method, device and readable storage medium Technical Field The present application relates to the field of wireless communications technologies, and in particular, to a communication method, a device, and a readable storage medium. Background Random access is a very critical step in a mobile communication system and is the last step in which a terminal establishes a communication link with a base station. The random access procedure refers to a procedure before a terminal (e.g., user Equipment (UE)) sends a random access preamble to attempt to access a network until a basic signaling connection is established between the UE and the network, the UE performs information interaction with a base station through random access to complete subsequent operations (e.g., calling, resource request, data transmission, etc.), and realizes uplink time synchronization with a system through random access, so that the performance of the random access directly affects the experience of the user. In the current random access procedure, a random access request message (may also be called as message 1 (msg 1)) is first sent by the UE, if the base station receives the random access request message, a random access response message (may also be called as message 2 (msg 2)) is returned to the UE, then the UE sends a connection establishment message (may also be called as message 3 (msg 3)) according to the random access response message, and finally the base station sends an indication message to the UE, indicating that the UE has access success or access failure. In the current random access scheme, when receiving a random access response message, the UE determines an optimal reception beam, receives the random access response message through the optimal reception beam, and then transmits a connection establishment message by using a transmission beam associated with the optimal beam according to beam reciprocity. However, in the case where the beams do not have reciprocity, the optimal reception beam and the optimal transmission beam are not the same, and in this case, this way, performance loss will be brought about, and communication quality will be affected. Therefore, how to determine the optimal transmit beam of the connection establishment message when the beam has no reciprocity, so as to avoid performance loss and improve communication quality is a problem to be solved at present. Disclosure of Invention The application provides a communication method, a device and a readable storage medium, which aim at the situation that an optimal receiving beam and an optimal transmitting beam of UE do not have reciprocity, and the optimal transmitting beam of the UE is indicated by transmitting beam indication information to the UE when a random response message is transmitted, so that the UE transmits by utilizing the indicated optimal transmitting beam when transmitting a connection establishment message, the performance loss can be reduced, and the communication quality is improved. In a first aspect, a communication method is provided, the method comprising a first communication device transmitting a random access request message, the first communication device receiving a random access response message, the random access response message comprising beam indication information, the first communication device transmitting a connection establishment message according to the beam indication information. By implementing the embodiment of the application, the first communication device determines the optimal transmission beam from the plurality of transmission beams according to the beam indication information in the received random access response message, and then transmits the connection establishment message by using the determined optimal transmission beam. In an alternative implementation, the first communication device determines a transmit beam according to the beam indication information, and sends the connection establishment message using the transmit beam. By implementing the embodiment of the application, the first communication device can quickly and accurately determine the transmitting beam in the scene that the beam does not have reciprocity. In an alternative implementation, the random access request message includes a random access preamble index value, the random access response message includes a medium access control protocol data unit (mediumaccesscontrolprotocoldataunit, MAC PDU) including at least one MAC subPDU and a beam indication field, the first communication device determines MAC subPDU corresponding to the random access request message and location information of MAC subPDU in the MAC PDU according to the random access preamble index value, and the first communication device determines a transmit beam based on the location information, the beam indication field, and the number of beams. By implementing the embodiment of the application, the first communication device finds MAC subPDU corr