Wireless AV Beamforming Maintenance via Candidate Sector Switching
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Solution Overview
Problem
Current wireless Audio-Video (AV) systems face challenges in maintaining beamforming, particularly in real-time operations and reducing redundancy, especially when dealing with instant blockages and channel changes, which affect the quality and efficiency of high-resolution video transmission.
Innovation Solution
A method for maintaining beamforming in wireless AV systems involves transmitting packets with both non-training and training fields based on candidate sector combinations, receiving feedback, and updating the best sector combination when channel changes occur due to blockages, enabling fast adaptation and reducing redundancy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If beamforming training is performed using multiple candidate sector combinations to ensure reliable high-resolution video transmission, then transmission reliability is improved, but transmission time and system complexity increase
Solution Approach 1:
The system performs preliminary beamforming training to identify multiple candidate sector combinations in advance. These candidate combinations are stored and can be quickly switched to when channel conditions change, avoiding the need for complete re-training and thus reducing time loss while maintaining reliability.
Solution Approach 2:
The beamforming system dynamically selects from multiple candidate sector combinations based on real-time channel conditions. Instead of using a fixed beamforming configuration, the system adapts by switching between pre-established candidate combinations, achieving both reliability and rapid response to channel changes.
2Adaptability or versatility
If multiple candidate sector combinations are evaluated and maintained for fast adaptation to blockages, then adaptability is improved, but device complexity and processing overhead increase
Solution Approach 1:
Multiple candidate sector combinations are pre-evaluated and stored during initial beamforming training. This preliminary action creates a ready pool of alternatives that can be quickly activated without complex real-time evaluation, reducing processing overhead while maintaining high adaptability to blockages.
Solution Approach 2:
The system maintains different qualities of candidate combinations - a smaller set of high-priority candidates for rapid switching and a larger set for comprehensive coverage. This local differentiation optimizes the balance between adaptability and complexity by allocating processing resources strategically.
3Reliability
If comprehensive beamforming training is performed to cover all possible sector combinations, then coverage and reliability are improved, but transmission efficiency and throughput decrease due to redundancy
Solution Approach 1:
The system extracts and maintains only the most relevant candidate sector combinations based on initial training results and channel characteristics. Instead of evaluating all possible combinations, it identifies and stores a optimized subset that provides sufficient coverage for reliable transmission while eliminating redundant evaluations, thus improving transmission efficiency.
Solution Approach 2:
The system changes the parameter of candidate combination quantity dynamically - using a smaller number of carefully selected candidates during normal operation to maximize efficiency, while having the capability to expand to more candidates when reliability requirements increase or channel conditions become more challenging.
Data Source
AI summary
A method by which a first wireless device maintains beamforming in a wireless AV system, according to one embodiment of the present invention, comprises the steps of: transmitting a packet including a non-training field and a plurality of training fields to a second wireless device, wherein the non-training field is transmitted on the basis of the best sector combination from among a plurality of candidate sector combinations predetermined between the first wireless device and the second wireless device, and the plurality of training fields is transmitted on the basis of the plurality of candidate sector combinations; receiving candidate beam feedback information as a response to the plurality of training fields; determining, on the basis of the candidate beam feedback information, whether a channel change due to an obstacle occurs; and updating the best sector combination on the basis of the candidate beam feedback information when it is determined that the channel change occurs.