Timing Advance Mapping for Multi-TRP Uplink Synchronization
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Solution Overview
Problem
Existing uplink synchronization methods in wireless communication systems are inadequate for scenarios involving multiple transmission and reception points (M-TRP) or multiple downlink control information based M-TRP, as they only address communication between a single network device and terminal device.
Innovation Solution
A method for determining a timing advance command (TAC) is provided, considering multiple parameters such as TCI state, SRS resource, SRS resource set, TRP, and TAG identity, which are determined through a random access response (RAR) to enhance uplink synchronization in new communication scenarios involving multiple network devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional single-cell uplink synchronization method is used, then the system is simple to operate, but it cannot support multiple transmission and reception points (M-TRP) communication scenarios
Solution Approach 1:
The patent segments the uplink synchronization mechanism by introducing separate timing advance commands for different TRPs (TAC-1 for first TRP, TAC-2 for second TRP). Each TRP has its own synchronization parameters, allowing independent timing adjustment for each reception point. This segmentation enables the system to handle M-TRP scenarios while maintaining clear, manageable parameter structures for each segment.
Solution Approach 2:
The patent adds a new dimension to the synchronization system by introducing TRP-specific identification (such as TRP ID or cell ID) as an additional parameter dimension. This allows the system to distinguish and manage synchronization parameters across multiple TRPs, transforming a single-dimension (single-cell) synchronization approach into a multi-dimensional framework that accommodates M-TRP architectures.
2Measurement precision
If timing advance command is determined for multiple parameters, then uplink synchronization accuracy is improved, but the determination process becomes more complex
Solution Approach 1:
The patent applies preliminary action by pre-configuring multiple timing advance commands (TAC-1, TAC-2) and their associated parameters before actual M-TRP communication begins. The network device prepares the synchronization parameter sets in advance, including TRP-specific TAC values and corresponding identification parameters, so that when M-TRP communication is established, the terminal device can immediately apply the appropriate pre-configured parameters without complex real-time calculations.
3Reliability
If separate timing advance commands are used for different TRPs, then uplink transmission timing alignment is improved, but the signaling overhead increases
Solution Approach 1:
The patent implements universality by designing a unified random access response (RAR) message structure that can carry multiple timing advance commands and their associated parameters simultaneously. The RAR message serves multiple functions: it provides synchronization for the first TRP, synchronization for the second TRP, and the mapping relationships between them. This multi-functional approach avoids the need for separate signaling messages for each TRP, thereby reducing overall signaling overhead while maintaining reliable timing alignment.
Data Source
AI summary
A method and an apparatus for determining a timing advance command, a terminal device, and a network device. The method includes the following. A network device sends a random access response (RAR), the RAR being used to determine a timing advance command (TAC) of each parameter in multiple parameters, where types of the multiple parameters include at least one of a transmission configuration indicator (TCI) state, a sounding reference signal (SRS) resource, an SRS resource set, a transmission and reception point (TRP), a control resource set (CORESET) pool identifier, or a timing advance group (TAG) identity. Correspondingly, the terminal device receives the RAR, and determines the TAC of each parameter in the multiple parameters according to the RAR.