Interference Reporting via Autocorrelation Feedback for 5G Scheduling
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Solution Overview
Problem
The 5G mobile communication system faces a challenge in balancing ultra-reliable low-latency communication (URLLC) services with high reliability and system capacity due to reduced data transmission efficiency from robust transmission solutions, necessitating improved interference measurement and scheduling.
Innovation Solution
An interference reporting method that enhances accuracy by using link adaptation technology, allowing network devices to obtain precise interference information through advanced parameter feedback, such as interference layer indicators, matrix indicators, and strength indicators, facilitating refined spatial domain scheduling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If robust transmission solution with more resources is used for URLLC service data, then transmission reliability is improved, but data transmission efficiency is reduced and system capacity is reduced
Solution Approach 1:
The patent changes the parameter representation from traditional wideband CQI to subband CQI, allowing different modulation and coding schemes to be applied to different frequency subbands. This enables fine-grained resource allocation where robust transmission is applied only where needed while maintaining efficiency in other subbands, thus resolving the contradiction between reliability and transmission efficiency
Solution Approach 2:
The patent segments the frequency spectrum into multiple subbands and performs interference measurement and CQI reporting for each subband independently. This segmentation allows the system to apply robust transmission solutions selectively to specific subbands experiencing interference, rather than applying them system-wide, thereby maintaining overall data transmission efficiency while ensuring reliability where needed
2Measurement precision
If wideband interference measurement is used, then interference information is obtained, but feedback overhead is high and accuracy for spatial domain scheduling is insufficient
Solution Approach 1:
The patent transitions from wideband interference measurement to subband interference measurement, adding the frequency dimension granularity. By measuring interference in each subband separately and reporting subband-specific CQI values, the system achieves higher measurement precision for spatial domain scheduling while managing feedback overhead through compact CQI indexing mechanisms
Solution Approach 2:
The patent implements partial interference reporting by selecting and reporting only the most relevant subband CQI information rather than exhaustive wideband measurements. This partial action approach provides sufficient accuracy for spatial domain scheduling decisions while significantly reducing feedback overhead compared to complete wideband interference measurement
Data Source
AI summary
This application provides an interference reporting method. In the method, a terminal device performs interference measurement on a first time-frequency resource, to obtain an autocorrelation matrix of an interference signal. The terminal device further determines a first interference parameter based on the autocorrelation matrix of the interference signal, and reports the first interference parameter to a network device. Based on the first interference parameter, the network device can restore the autocorrelation matrix of the interference signal obtained by the terminal device. This helps the network device perform more accurate downlink data scheduling.