Group-Selective Channel Feedback for MU-MIMO Interference Measurement
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Solution Overview
Problem
In MU-MIMO wireless communication systems, base stations face challenges in accurately measuring inter-terminal interference due to its variability over time, leading to control channel overload and transmission failures when simultaneously commanding all terminals for feedback.
Innovation Solution
A selective channel feedback method where a base station allocates a group identifier to terminals for simultaneous signal measurement and feedback, allowing instantaneous interference information to be received through a common control channel, enabling more efficient MU-MIMO scheduling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the base station commands all terminals to transmit feedback simultaneously, then the interference measurement accuracy is improved, but the control channel overload increases and transmission failures occur
Solution Approach 1:
The invention segments the terminal population into multiple groups based on channel characteristics and interference patterns. Each group is assigned a specific time slot or resource for feedback transmission, allowing the base station to command subsets of terminals to feedback simultaneously without overwhelming the control channel. This segmentation resolves the contradiction by distributing the feedback load while maintaining measurement accuracy through selective simultaneous feedback from appropriate terminal groups.
2Reliability
If the base station commands terminals to transmit feedback in sequence, then the control channel overload is reduced, but the interference measurement accuracy deteriorates due to time variability
Solution Approach 1:
The invention implements periodic feedback transmission where terminals in different groups are commanded to feedback at different periodic intervals. This allows the base station to receive feedback from multiple groups in a structured sequence over time, reducing control channel overload while capturing interference measurements at multiple time points. The periodic action enables the base station to aggregate interference information from different time slots, maintaining measurement accuracy while avoiding simultaneous feedback conflicts.
3Reliability
If individual feedback commands are transmitted to terminals, then the control channel overload is reduced, but the complexity of feedback scheduling increases
Solution Approach 1:
The invention creates a universal feedback scheduling framework where a single base station command structure can address multiple terminal groups simultaneously. The feedback command format is designed to be multi-functional, capable of addressing different terminal groups, time slots, and resource allocations through a unified signaling mechanism. This universality reduces scheduling complexity by providing a standardized approach to managing individual and group feedback transmissions without requiring separate complex scheduling procedures for each scenario.
Data Source
AI summary
Systems, base stations, terminals, and methods for group-selective channel feedback in a wireless communication system are described. In one signal measurement method for a base station supporting Multiuser Multiple-Input Multiple-Output (MU-MIMO), the base station allocates a group identifier to a terminal group for performing and reporting signal measurements simultaneously. When the base station transmits control information including the group identifier, each one of terminals belonging to the terminal group performs signal measurement, generates signal measurement feedback, and simultaneously transmits the signal measurement feedback to the base station.