BRP Frame Transmission in TDD Slots for WLAN Beamforming
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Solution Overview
Problem
In wireless local area networks (WLANs), existing beamforming techniques for TDD SP structures face inefficiencies due to the need for consecutive transmission of BRP frames, leading to time loss and reduced slot utilization when not all frames can be transmitted within a TDD slot, especially in achieving the high transmission rates required by the IEEE 802.11ay standard.
Innovation Solution
The proposed method allows for the transmission of remaining BRP frames in a subsequent TDD slot allocated first, with the code field value indicating completion, enabling efficient SU-MIMO beamforming by utilizing non-reciprocal training and adjusting the TDD slot structure to minimize power consumption and maximize channel utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If BRP frames are transmitted consecutively within a TDD slot to complete beamforming training, then beamforming training can be completed within the slot, but time loss and reduced slot utilization occur when not all frames can be transmitted
Solution Approach 1:
The patent segments the beamforming training process into multiple TDD slots when necessary. Instead of requiring all BRP frames to be transmitted within a single TDD slot, the training can span across multiple slots, with each slot carrying a portion of the required frames. This segmentation resolves the contradiction by allowing reliable training completion without forcing all transmissions into one slot, thus avoiding time loss and improving slot utilization.
2Productivity
If beamforming training is completed within a single TDD slot, then training efficiency is improved, but transmission rate requirements for IEEE 802.11ay cannot be achieved
Solution Approach 1:
The patent introduces dynamic adaptability in the beamforming training process by allowing the system to adjust the number of TDD slots used based on the specific requirements of each transmission scenario. When channel conditions and traffic demands allow, training can be completed in fewer slots for higher efficiency. When higher transmission rates are required or channel conditions demand more comprehensive training, the system can extend training across multiple slots. This dynamic approach resolves the contradiction between training efficiency and transmission rate requirements.
3Measurement precision
If multiple BRP frames are transmitted in consecutive TDD slots, then beamforming accuracy is improved, but power consumption increases
Solution Approach 1:
The patent employs parameter changes to optimize the balance between beamforming accuracy and power consumption. By adjusting parameters such as the number of TDD slots allocated for training, the number of BRP frames transmitted, and the timing distribution of these frames across slots, the system can achieve the necessary beamforming accuracy while minimizing power consumption. The code field value mechanism allows precise control over training completion status, enabling the system to stop training when sufficient accuracy is achieved rather than always using the maximum number of slots.
Data Source
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AI summary
Proposed are a method and a device for transmitting a signal in a wireless local area network (WLAN) system. Specifically, a first STA transmits at least one BRP frame in order to perform MIMO beamforming training with a second STA. The at least one BRP frame is transmitted during a TDD-based SP. The first STA transmits a signal to the second STA based on MIMO beamforming training. The SP includes a first TDD slot and a second TDD slot. If only a first BRP frame, which is part of the at least one BRP frame, can be transmitted in the first TDD slot, a second BRP frame, which is the remaining of the at least one BRP frame, is transmitted in the second TDD. The second TDD slot is a transmission TDD slot allocated first after the first TDD slot.