Wireless Communication Apparatus CSI Report Distribution
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Solution Overview
Problem
In wireless communication systems, the discontinuous transmission of CSI-RS and SRS reference signals leads to concentration of channel quality information requests and reports, causing degradation in throughput due to the finite resources being consumed.
Innovation Solution
A wireless communication apparatus and method that distribute the timing of channel quality information requests and reports across multiple reception apparatuses, using a reference signal generator, channel quality information request and report setting sections, and a communication section to manage the transmission and reception of reference signals and feedback information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If reference signals are discontinuously transmitted to support high-order MIMO and CoMP, then measurement precision for channel quality is improved, but channel quality information requests and reports concentrate at specific timing, causing resource consumption and throughput degradation
Solution Approach 1:
The patent segments the channel quality information reporting process by introducing multiple reporting modes (periodic, aperiodic, and semi-persistent reporting) and distributing reporting instances across different time resources. This segmentation prevents concentration of reporting traffic at single timing points while maintaining measurement precision for high-order MIMO and CoMP operations.
Solution Approach 2:
The patent implements dynamic reporting mechanisms where the reporting timing and frequency are adaptively adjusted based on channel conditions, traffic requirements, and network state. This allows the system to optimize between measurement precision and resource consumption dynamically, preventing throughput degradation while maintaining accurate channel quality feedback.
2Productivity
If channel quality information requests are transmitted simultaneously to multiple reception apparatuses, then resource utilization efficiency is improved, but concentration of feedback reports occurs, consuming finite resources and degrading throughput
Solution Approach 1:
The patent resolves the contradiction by introducing additional time-domain dimensions for report distribution. Instead of concentrating reports in a single time slot, the system spreads reports across multiple time resources using different reporting periods, offsets, and patterns, thereby reducing instantaneous resource consumption while maintaining efficient resource utilization.
Solution Approach 2:
The patent changes the timing parameters of channel quality information reports by configuring different reporting periods, subframe offsets, and transmission patterns for different reception apparatuses. This parameter diversification distributes the reporting load across time resources, preventing resource exhaustion while maintaining high resource utilization efficiency.
Data Source
AI summary
To suppress concentration of channel quality information requests and reports in a case of discontinuously transmitting reference signals at specific resources in a time domain, and thereby preventing degradation in throughput. A transmission apparatus transmits an instruction of CSI request distributed for each reception apparatus in a subframe concurrently with or earlier than a reference signal CSI-RS to each of reception apparatuses. Each of the reception apparatuses detects the CSI request from the transmission apparatus and calculates CSI from a channel estimation value of CSI-RS received thereafter. Then, the reception apparatus identifies CSI report subframe of the own apparatus from CSI report interval information of a given time interval notified in advance, the subframe in which the CSI request is detected and transmission timing of CSI-RS, and transmits a feedback signal including CSI report value by using PUSCH at the timing of the CSI report subframe.