Multi-TRP Reference Timing for Accurate Uplink Synchronization
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Solution Overview
Problem
In wireless communication systems with multiple transmitting and receiving points (TRPs), terminal devices face challenges in determining a downlink reference timing corresponding to a timing advance (TA), which affects uplink synchronization due to asynchronous clocks and different downlink reference timings.
Innovation Solution
A method where a transmitting and receiving point transmits information to a terminal device to enable it to determine a downlink reference timing based on a specified mode, allowing the terminal device to perform uplink synchronization using the indicated timing advance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple transmitting and receiving points are used for communication, then communication reliability and coverage are improved, but the complexity of determining downlink reference timing increases
Solution Approach 1:
The patent segments the timing determination process by introducing different determination modes (first mode and second mode) that can be selectively applied to different transmitting and receiving points. The terminal device divides TRPs into groups based on their timing characteristics, applying simplified timing determination to some TRPs while using more complex methods for others, thereby managing overall system complexity while maintaining multi-TRP communication reliability.
Solution Approach 2:
The patent implements dynamic timing determination by allowing the terminal device to flexibly switch between different determination modes based on the specific TRP being accessed. The network can dynamically indicate which determination mode to use through configuration information, enabling adaptive timing management that responds to changing communication conditions and TRP characteristics.
2Measurement precision
If different downlink reference timings are used for different transmitting and receiving points, then uplink synchronization accuracy is improved, but the difficulty of timing determination increases
Solution Approach 1:
The patent applies preliminary action by having the network pre-configure timing indication information and determination mode parameters before the terminal device needs to perform timing determination. The network sends configuration information in advance that includes reference timing indicators and mode selection parameters, allowing the terminal device to perform accurate timing determination without real-time calculation complexity.
Solution Approach 2:
The patent introduces an intermediary mechanism through the network's timing indication information that mediates between the terminal device and multiple TRPs with different timing characteristics. This intermediary configuration information translates complex multi-TRP timing relationships into simplified determination rules that the terminal device can follow, reducing determination difficulty while maintaining synchronization accuracy.
3Reliability
If timing advance is adjusted for each transmitting and receiving point, then uplink synchronization performance is improved, but the amount of timing information that needs to be determined increases
Solution Approach 1:
The patent merges timing information processing by combining the determination of downlink reference timing and uplink timing advance into a unified process. When the terminal device determines the downlink reference timing using the indicated determination mode, it simultaneously obtains the corresponding timing advance value, reducing the overall information processing load while maintaining synchronization performance across multiple TRPs.
Data Source
AI summary
The present application provides a wireless communication method and a communications device. One example method includes: receiving, by a terminal device, first information from a first transmitting and receiving point; and determining, by the terminal device based on the first information, a first downlink reference timing corresponding to a first timing advance (TA), wherein the first TA corresponds to the first transmitting and receiving point, the first transmitting and receiving point is one of a plurality of transmitting and receiving points that communicate with the terminal device, and the first information indicates a determination mode of the first downlink reference timing.