Uplink Synchronization via Terminal-Coordinated Reference Signals
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Solution Overview
Problem
In terminal coordinated communication, achieving uplink synchronization without network access is challenging due to differences in internal delays and external multipaths between supporting and benefited terminals, leading to potential interference and resource inefficiencies.
Innovation Solution
A method where a supporting terminal acquires an access identifier and uplink port number from a benefited terminal, sends a reference signal, and receives synchronization information adjustment values to perform uplink synchronization, allowing synchronization without network access and reducing interference and preamble resource usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a supporting terminal performs complete network access to achieve uplink synchronization, then synchronization accuracy is improved, but network resource consumption and access overhead increase
Solution Approach 1:
The patent extracts the essential synchronization function from the complete network access process. The supporting terminal only performs the necessary random access procedure to obtain uplink synchronization timing, without completing full network access protocols. This extracts only the critical timing synchronization element while eliminating unnecessary network resource consumption associated with complete access procedures.
Solution Approach 2:
The patent applies partial action by having the supporting terminal perform only the minimal required network access steps (sending random access preamble and receiving timing advance) rather than completing full network access. This partial action achieves the necessary uplink synchronization without the excessive resource consumption of complete access procedures.
2Reliability
If multiple terminals perform random access simultaneously, then uplink synchronization is achieved, but preamble resource consumption and access interference increase
Solution Approach 1:
The patent merges the random access procedures of multiple terminals by having the benefiting terminal trigger the supporting terminal to perform random access. This consolidation reduces the total number of independent random access attempts, thereby reducing preamble resource consumption and access interference while maintaining reliable uplink synchronization for coordinated communication.
3Measurement precision
If a supporting terminal completes full network access, then uplink synchronization is achieved, but access device processing overhead and system complexity increase
Solution Approach 1:
The patent extracts only the essential timing synchronization function from the complete network access process. The access device only needs to process the random access preamble and provide timing advance feedback, without needing to handle the full complexity of complete network access procedures. This reduces access device processing overhead while maintaining precise uplink synchronization.
Data Source
AI summary
An uplink synchronization method and a terminal are disclosed, where implementation of the terminal is as follows: a supporting terminal sends the reference signal by using a access identifier of a benefited terminal, and receives a adjustment value of synchronization information of the supporting terminal, so that uplink synchronization is implemented. The supporting terminal does not need to access a network, and therefore interference caused by the supporting terminal to another terminal and the benefited terminal on an access device side is avoided, and a preamble signal resource is reduced.