5G UE Timing Adjustment for Cross-Link Interference
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Solution Overview
Problem
Current 5G mobile communication systems lack an efficient method to dynamically adjust the downlink (DL) to uplink (UL) ratio in response to traffic variations, leading to reduced DL/UL configuration flexibility and increased interference in dual connectivity scenarios.
Innovation Solution
A method involving user equipment (UE) measurements to adjust the time error between the downlink reference timing and the sounding reference signal (SRS) arrival timing from neighboring UEs, allowing for flexible duplex configurations to mitigate cross-link interference (CLI) and optimize UL/DL ratios based on traffic conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the same DL/UL configuration is used in serving cell and neighboring cell to minimize interference, then interference is reduced, but DL/UL configuration flexibility decreases
Solution Approach 1:
The patent applies local quality by allowing different DL/UL configurations in different cells (serving cell vs. neighboring cell). Each cell can independently select its DL/UL configuration based on local traffic conditions, rather than forcing uniform configuration across all cells. This enables cell-specific adaptation while managing interference through coordinated resource allocation.
Solution Approach 2:
The patent implements dynamics by enabling dynamic adjustment of DL/UL configuration ratios in response to varying traffic conditions. The system can change the DL/UL configuration flexibly based on real-time traffic demands, allowing the network to adapt to changing load conditions rather than using fixed configurations.
2Device complexity
If DL/UL configuration is fixed to minimize interference, then interference management is simplified, but response to traffic variations becomes inefficient
Solution Approach 1:
The patent enables dynamic DL/UL configuration adjustment based on traffic conditions, allowing the system to respond efficiently to varying traffic demands. The network can modify the DL/UL ratio in each cell according to real-time traffic load, improving productivity without requiring complex centralized coordination for every change.
Solution Approach 2:
The patent applies self-service by enabling each cell to autonomously adjust its DL/UL configuration based on local traffic conditions. The serving cell and neighboring cells can independently determine their optimal configurations based on their own traffic demands, reducing the need for complex centralized interference management while maintaining efficient traffic response.
3Device complexity
If time error between downlink reference timing and SRS arrival timing is not adjusted, then measurement procedure is simpler, but cross link interference measurement precision deteriorates
Solution Approach 1:
The patent applies preliminary action by adjusting the time error between downlink reference timing and SRS arrival timing before performing CLI measurements. This timing alignment is performed in advance to ensure that measurements are taken at the optimal moment when interference characteristics can be accurately captured, improving measurement precision without adding complex real-time adjustment mechanisms.
Solution Approach 2:
The patent implements parameter changes by adjusting the timing parameter (time error) between downlink reference signals and uplink SRS signals. By modifying this timing parameter, the system optimizes the measurement conditions for CLI assessment, enabling more accurate interference measurements while maintaining a relatively simple measurement procedure.
Data Source
AI summary
A disclosure of the present specification provides a method for performing measurements. The method may performed by a user equipment (UE) comprise: performing, by the UE, measurements; based on that (i) the measurements are for measuring a cross link interference (CLI) and (ii) that the measurements are performed on a sounding reference signal (SRS) from a neighboring UE in a neighboring cell, adjusting a time error between a downlink reference timing in a serving cell and a SRS arrival timing from the neighboring UE. The adjustment is performed based on offset.