SU-MIMO Beamforming in TDD Service Periods for Wireless LAN
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Solution Overview
Problem
Current wireless local area network (WLAN) systems face inefficiencies in achieving high transmission rates in Time Division Duplex (TDD) Service Periods (SPs) due to the lengthy beamforming process, which is not optimized for the TDD SP structure, making it difficult to meet the performance requirements of the IEEE 802.11ay standard.
Innovation Solution
The implementation of a method and device for performing Single-User Multiple-Input Multiple-Output (SU-MIMO) beamforming within a TDD SP, utilizing a four-subphase process that includes SU-MIMO beamforming setup, initiator-SU-MIMO beamforming training, responder-SU-MIMO beamforming training, and SU-MIMO beamforming feedback, allowing for efficient beamforming completion using at least two TDD slots within one TDD interval, thereby reducing the overall beamforming time and minimizing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional beamforming process is used in TDD SP structure, then beamforming can be performed, but the beamforming time becomes excessively long and power consumption increases
Solution Approach 1:
The beamforming process is divided into four distinct subphases: SU-MIMO beamforming setup subphase, initiator-SU-MIMO beamforming training subphase, responder-SU-MIMO beamforming training subphase, and SU-MIMO beamforming feedback subphase. This segmentation allows each subphase to be optimized independently and executed efficiently within the TDD SP structure, reducing overall beamforming time while maintaining performance.
Solution Approach 2:
The SU-MIMO beamforming setup subphase is performed in advance to establish beamforming parameters and configurations before actual data transmission begins. By completing setup activities preliminarily, the subsequent training and feedback phases can proceed more quickly without redundant operations, thereby reducing total beamforming time.
2Reliability
If traditional beamforming process is used in TDD SP structure, then beamforming can be performed, but power consumption increases due to extended beamforming duration
Solution Approach 1:
Dividing the beamforming process into four subphases enables precise control of power consumption in each stage. The setup subphase prepares necessary parameters once, avoiding repeated power-intensive operations during data transmission. This segmentation ensures beamforming performance while minimizing energy usage through efficient resource allocation in each subphase.
Solution Approach 2:
The beamforming subphases are designed to execute continuously within the TDD SP structure without unnecessary interruptions or repetitions. By maintaining continuous useful action throughout the beamforming process, the system achieves reliable beamforming performance while reducing overall power consumption through eliminated idle periods and redundant operations.
3Productivity
If beamforming is optimized for TDD SP structure, then transmission rate can be improved, but the system complexity increases
Solution Approach 1:
The four-subphase structure provides a clear, organized framework that simplifies implementation despite the enhanced functionality. Each subphase has well-defined objectives and procedures, making the complex beamforming process more manageable and easier to implement in TDD SP structures while achieving improved transmission rates.
4Loss of time
If beamforming time is reduced, then power consumption decreases, but beamforming accuracy may be compromised
Solution Approach 1:
The setup subphase performs all necessary preparatory actions in advance, including parameter configuration and channel assessment. This preliminary action ensures that accurate beamforming can be achieved quickly during the subsequent training subphases, reducing overall time while maintaining beamforming accuracy through pre-established optimal parameters.
Solution Approach 2:
The SU-MIMO beamforming feedback subphase provides explicit feedback mechanisms that allow the system to verify and adjust beamforming accuracy. This feedback ensures that even with reduced beamforming time, the system maintains high accuracy by validating results and making necessary corrections within the compressed timeline.
Data Source
AI summary
Proposed are a method and an apparatus for transmitting a signal by performing MIMO beamforming in a wireless LAN system. Specifically, a first STA performs MIMO beamforming during a second STA and TDD-based SP. The first STA transmits a signal to the second STA on the basis of a result of the MIMO beamforming. The SP includes a plurality of TDD slots. The MIMO beamforming includes a first sub-step and a second sub-step. In the first sub-step, after receiving a first MIMO beamforming setup frame from the second STA, the first STA transmits a second MIMO beamforming setup frame in the first allocated TDD slot among the TDD slots allocated to the first STA. In the second sub-step, after receiving a first MIMO beamforming feedback frame from the second STA, the first STA transmits a second MIMO beamforming feedback frame in a first allocated TDD slot among the TDD slots allocated to the first STA.