Sounding Reference Signal Sub-Frame Configuration for Wireless Interference
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently managing sounding reference signals (SRS) across multiple cells to minimize cross-cell interference and optimize resource allocation, particularly in scenarios where different user equipment (UE) may have varying SRS sub-frame configurations.
Innovation Solution
Each base station transmits a sounding reference signal (SRS) sub-frame configuration to connected user equipment (UE), allowing them to operate based on specific permitted sub-frames, using a combination of periodicity (TSFC) and offset (ΔSFC) parameters, which are encoded and broadcast in a System Information Block (SIB) to ensure minimal interference and flexible system deployment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If sounding reference signals are transmitted in all sub-frames, then channel estimation accuracy is improved, but cross-cell interference increases
Solution Approach 1:
The patent segments the sounding reference signal transmissions across different cells by assigning different sub-frame configurations to different cells. Each cell transmits SRS in specific sub-frames determined by cell-specific parameters, dividing the overall transmission resource space to avoid simultaneous transmissions in the same sub-frame across cells, thereby reducing cross-cell interference while maintaining channel estimation capability.
2Device complexity
If uniform sounding reference signal configuration is used across all cells, then system complexity is reduced, but resource allocation efficiency deteriorates
Solution Approach 1:
The patent implements local quality by allowing each cell to have cell-specific sounding reference signal sub-frame configurations determined by cell identity and other local parameters. This enables optimization of SRS resources according to local traffic conditions, channel characteristics, and interference scenarios in each cell, improving resource allocation efficiency while maintaining manageable system complexity through standardized configuration methods.
Data Source
AI summary
A method of wireless communication including a plurality of fixed basestations and a plurality of mobile user equipment with each basestation transmitting to any user equipment within a corresponding cell a sounding reference signal sub-frame configuration indicating sub-frames when sounding is permitted. Each user equipment recognizes the sounding reference signal sub-frame configuration and sounds only at permitted sub-frames. Differing user equipment may have differing sounding reference signal sub-frame configurations. There are numerous manners to encode the transmitted information.