CN-122003944-A - Timing alignment technique

Abstract

Techniques are described in which a communication device receives a configuration indicating that the communication device is configured to perform a first transmission and a second transmission from the communication device, wherein the configuration indicates that the communication device is configured to receive a third transmission from a network device, and wherein the first transmission and the third transmission are associated with a first transmission parameter and the second transmission is associated with a second transmission parameter, the communication device receives a message triggering the communication device to perform a Physical Random Access Channel (PRACH) transmission, and the communication device performs the PRACH transmission in response to receiving the message, wherein the message indicates to the communication device that the PRACH transmission is associated with the first transmission parameter or the second transmission parameter.

Inventors

• GUO XIAOLONG
• GAO BO
• YAO KE
• ZHANG YANG

Assignees

• 中兴通讯股份有限公司

Dates

Publication Date

20260508

Application Date

20231031

Claims (20)

1. 1. A method of wireless communication, comprising: Receiving, by a communication device, a configuration indicating that the communication device is configured to perform a first transmission and a second transmission from the communication device, Wherein the configuration indicates that the communication device is configured to receive a third transmission from a network device, Wherein the first transmission and the third transmission are associated with a first transmission parameter, an Wherein the second transmission is associated with a second transmission parameter; receiving, by the communication device, a message triggering the communication device to perform physical random access channel, PRACH, transmission, and In response to receiving the message, performing, by the communication device, Wherein the message indicates to the communication device that the PRACH transmission is associated with the first transmission parameter or the second transmission parameter.
2. 2. The method of claim 1, wherein the message triggers PRACH transmission associated with the second transmission parameter, and wherein the message indicates any one or more of: synchronizing signal SS and physical broadcast channel PBCH block index corresponding to SS/PBCH blocks not configured for the communication device; The information of the second transmission parameter comprises one or more of transmission configuration indication TCI state, sounding reference signal SRS resource, timing advance group TAG or universal identification, and/or The PRACH transmission is an indication triggered for the second transmission parameter.
3. 3. The method according to claim 2, Wherein performing a PRACH transmission associated with the second transmission parameter comprises determining a spatial transmission parameter applicable to the PRACH transmission based on or in association with the TCI state or uplink transmission, Wherein the TCI status or the uplink transmission is based on information indicated in the message or a predefined rule, and Wherein the spatial transmission parameters include any one or more of spatial relationships, spatial filters, spatial domain filters, beam or antenna port quasi co-location parameters.
4. 4. The method of claim 1, further comprising: in response to performing the PRACH transmission, a random access response message is received, wherein the random access response message indicates a timing advance adjustment.
5. 5. The method of claim 4, further comprising: A first timing advance value is determined based on a timing advance adjustment indicated in the random access response message associated with the first transmission parameter.
6. 6. The method of claim 4, further comprising: A second timing advance value is determined based on a timing advance adjustment indicated in the random access response message associated with the second transmission parameter.
7. 7. The method of claim 6, wherein the random access response message associated with the second transmission parameter is scheduled by a PDCCH addressed to a C-RNTI, RA-RNTI, or MsgB-RNTI.
8. 8. The method of claim 1, wherein performing the PRACH transmission further comprises determining RACH resources based on a configuration indicating a mapping between a synchronization signal SS and physical broadcast channel PBCH blocks and random access channel RACH occasions.
9. 9. The method of claim 8, wherein the configuration indicates a RACH resource mapping configuration for each of the first and second transmission parameters, and wherein the RACH resource mapping configuration indicates a number of synchronization signals and physical broadcast channel SS/PBCH blocks mapped on the RACH occasion and a number of contention-based preambles associated with SS/PBCH blocks in each RACH occasion.
10. 10. The method of claim 9, wherein the RACH resource mapping configuration for each of the first transmission parameter and the second transmission parameter indicates a same contention-based preamble total number.
11. 11. The method according to any one of claim 1 to 10, Wherein the random access channel, RACH, resources for performing PRACH transmission associated with the second transmission parameter are determined based on a transmission configuration indication, TCI, state or sounding reference signal, SRS, transmission, and Wherein the TCI state or the SRS transmission is determined based on predefined rules or information indicated in the message.
12. 12. The method according to claim 11, Wherein the RACH resources for performing PRACH transmissions associated with the second transmission parameter are determined based on a configuration indicating a first association between a TCI state and a RACH occasion or indicating a second association between SRS resources and a RACH occasion.
13. 13. The method of any of claims 1-12, wherein a transmission power for performing the PRACH transmission is based on a preamble target received power indicated by the configuration.
14. 14. The method of claim 13, wherein the configuration indicates a first preamble target received power and a second preamble target received power for the first transmission parameter and the second transmission parameter, respectively.
15. 15. The method of claim 13, wherein the configuration further indicates a preamble target power offset for PRACH transmissions associated with the second transmission parameter.
16. 16. The method according to any one of claim 1 to 15, Wherein the transmission power for performing the PRACH transmission is based on a preamble target received power and on a pathloss value associated with a reference signal or an uplink transmission performed by the communication device other than the PRACH transmission.
17. 17. The method of any of claims 1-16, wherein a transmission power for performing the PRACH transmission is based on a closed loop power adjustment value associated with one or more uplink transmissions other than the PRACH transmission.
18. 18. The method of any one of claims 16 and 17, wherein the reference signal, the uplink transmission other than PRACH transmission, or one or more of the uplink transmissions other than PRACH transmission is based on information indicated in the message or a predefined rule.
19. 19. The method of claim 18, wherein the predefined rules comprise any one or more of: The TCI state with the lowest index ID, Up-to-date uplink transmission associated with the second transmission parameter before receiving the message, and/or The latest uplink transmission associated with the second transmission parameter before the PRACH transmission.
20. 20. The method of any of claims 1 to 19, wherein the communication device receives a random access response message associated with the first transmission parameter or the second transmission parameter from a network device within a time window.

Description

Timing alignment technique Technical Field This document relates generally to digital wireless communications. Background Mobile communication technology is pushing the world to an increasingly interconnected and networked society. Next generation systems and wireless communication technologies will need to support a wider range of application scenario features and provide more complex and sophisticated access requirements and flexibility than existing wireless networks. Long Term Evolution (LTE) is a wireless communication standard for mobile devices and data terminals that is established by the third generation partnership project (3 GPP). LTE ADVANCED (LTE-a) is a wireless communication standard that enhances the LTE standard. The fifth generation wireless system (5G) has further evolved based on the LTE and LTE-a wireless standards, in an effort to support higher data rates, massive connections, ultra low latency, high reliability, and other emerging traffic demands. Disclosure of Invention The technology disclosed herein relates to uplink timing alignment for transmission parameters (e.g., cell, transmission Reception Point (TRP), beam set, or Transmission Configuration Indication (TCI) status) configured for uplink transmissions only (e.g., transmission(s) from a User Equipment (UE) to a Base Station (BS)). Some example techniques include a UE receiving an uplink-only transmission configuration, the UE determining a Physical Random Access Channel (PRACH) transmission for establishing uplink timing alignment of the transmission parameters, the UE determining Random Access Channel (RACH) resources, transmission power, and spatial transmission parameters of the PRACH transmission, and the UE detecting a random access response message within a window. A first example technique includes a UE receiving an uplink-only configuration that enables the UE to send uplink transmissions to TRPs without receiving downlink transmissions from the TRPs, the UE determining PRACH transmissions in response to receiving a network message (e.g., a physical downlink control channel (physical downlink control channel, PDCCH) command) to establish uplink timing alignment for transmission parameters for which downlink transmission parameters are not configured, and the UE sending the PRACH transmissions using spatial transmission parameters based on TCI status or uplink transmissions other than the PRACH transmissions. A second example technique includes the UE determining RACH resources (e.g., RACH occasions) for the PRACH transmission based on a new configuration of SSB to RACH resource (e.g., RACH occasion) mapping, and the UE determining RACH resources based on a TCI state or SRS transmission based on an indication of a PDCCH order or a predefined rule. A third example technique includes the UE determining a transmission power of the PRACH transmission based on (1) a new configuration of a preamble target received power, (2) a path loss value associated with a downlink reference signal of another transmission parameter or an uplink transmission other than the PRACH transmission, or (3) a closed loop power adjustment value (e.g., absolute or cumulative transmission power control (transmit power control, TPC) command) associated with the other uplink transmission. A fourth example technique includes the UE detecting a random access response message from the network within a time window, which may be in units of slots or symbols, and the UE transmitting a PRACH retransmission when the random access response message is not correctly received (or received) within the time window. An example wireless communication method includes a communication device receiving a configuration indicating that the communication device is configured to perform a first transmission and a second transmission from the communication device, wherein the configuration indicates that the communication device is configured to receive a third transmission from a network device, and wherein the first transmission and the third transmission are associated with a first transmission parameter and the second transmission is associated with a second transmission parameter, the communication device receiving a message triggering the communication device to perform a Physical Random Access Channel (PRACH) transmission, and the communication device performing the PRACH transmission in response to receiving the message, wherein the message indicates to the communication device that the PRACH transmission is associated with the first transmission parameter or the second transmission parameter. In some embodiments, the message triggers a PRACH transmission associated with a second transmission parameter, and wherein the message indicates any one or more of an SS/PBCH block index corresponding to a Synchronization Signal (SS) and a Physical Broadcast Channel (PBCH) block that are not configured for the communication device, information of the second transmission parame