Multi-TRP Uplink Synchronization With TRP-Specific Timing Advances
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Solution Overview
Problem
In multi-transmission reception point (m-TRP)-based uplink transmission scenarios, terminal devices face challenges in acquiring a suitable timing advance (TA) due to varying distances from multiple TRPs, leading to potential uplink synchronization errors.
Innovation Solution
A wireless communication method where a terminal device receives first signaling to initiate a random access to a target network device, transmitting a PRACH and receiving a random access response (RAR) to acquire a target TA value, ensuring synchronization with each TRP by using TRP-specific TAs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a terminal device uses a uniform TA for m-TRP-based uplink transmission, then the device complexity is reduced, but uplink synchronization precision deteriorates due to varying distances from multiple TRPs
Solution Approach 1:
The patent segments the TA parameter into multiple TRP-specific TA values (TA1, TA2, ..., TAn) corresponding to different transmission reception points. Each TRP has its own dedicated TA value, allowing the terminal device to maintain separate timing synchronization for each TRP based on its specific distance, thereby resolving the contradiction between device complexity and synchronization precision.
Solution Approach 2:
The patent applies local quality by assigning different TA values to different TRPs based on their respective locations and distances from the terminal device. Each TRP receives a customized TA value tailored to its specific propagation conditions, rather than using a uniform TA for all TRPs, thus achieving precise local synchronization while managing complexity through structured configuration.
2Measurement precision
If the terminal device initiates random access to acquire TRP-specific TA values, then uplink synchronization precision is improved, but the time required for TA acquisition increases
Solution Approach 1:
The patent applies preliminary action by having the network device pre-configure multiple TRP-specific TA values and provide them to the terminal device in advance through RRC signaling or system information before the terminal device needs to perform random access. This allows the terminal device to acquire multiple TAs simultaneously or in advance, reducing the time loss associated with sequential random access procedures for each TRP.
3Measurement precision
If the network device provides multiple TRP-specific TA values to the terminal device, then uplink synchronization precision is improved, but the signaling overhead increases
Solution Approach 1:
The patent applies parameter changes by encoding multiple TRP-specific TA values in a compact format within RRC signaling or system information blocks. Instead of transmitting separate full TA values for each TRP, the network device uses efficient parameter representation and compression techniques to convey multiple TA values with reduced signaling overhead, thus achieving precise multi-TRP synchronization while minimizing the quantity of signaling data.
Data Source
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AI summary
A wireless communication method, a terminal device, and a network device. The method comprises: a terminal device receives first signaling sent by a first network device, the first signaling being used for instructing the terminal device to initiate a random access process to a target network device, wherein the first signaling comprises first indication information, and the first indication information is used for indicating the target network device; the terminal device sends a physical random access channel (PRACH) to the target network device; the terminal device receives a random access response (RAR), the RAR comprising a target timing advance (TA) value, and the target TA value being a TA value of the terminal device for the target network device.