Long-Distance Wi-Fi TWT Mechanism for Hidden Node Collision Reduction
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Solution Overview
Problem
Long-distance Wi-Fi communication faces challenges such as hidden node collisions and increased propagation delay, which lead to transmission errors, especially when block acknowledgement waiting times are shorter than the propagation delay.
Innovation Solution
The implementation of a Target Wake Time (TWT) transmission mechanism in a TDMA (Time Division Multiple Access) framework, where devices receive a TWT configuration from a network node, allowing them to communicate during designated service periods, thereby avoiding contention and optimizing resource utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If directional antennas are used for long-distance Wi-Fi communication, then communication distance is improved, but hidden node detection capability deteriorates
Solution Approach 1:
The communication process is divided into two distinct stages: contention access stage for initial connection and channel sensing, and contention-free stage for actual data transmission. This segmentation allows directional antennas to be used during data transmission while maintaining reliability through prior omnidirectional channel sensing.
Solution Approach 2:
Channel sensing and TWT configuration are performed in advance during the contention access stage before actual data transmission begins. This preliminary action ensures that hidden node issues are addressed before they can cause transmission errors.
2Productivity
If block acknowledgement waiting time is kept short, then transmission efficiency is improved, but transmission error rate increases due to propagation delay
Solution Approach 1:
The block acknowledgement waiting time is made dynamic rather than fixed. It is adjusted based on the measured propagation delay in the long-distance channel, allowing the system to optimize between transmission efficiency and reliability according to actual channel conditions.
Solution Approach 2:
The system uses feedback from channel measurements and transmission outcomes to adjust the block acknowledgement waiting time. This feedback mechanism allows the system to adapt to varying propagation delays and maintain optimal performance.
Data Source
AI summary
A long-distance Wi-Fi communication method is provided. The long-distance Wi-Fi communication method may include the following steps. An apparatus may connect with a network node at a contention access stage. The apparatus may receive the target wake time (TWT) configuration at the contention access stage from a network node, wherein the TWT configuration may comprise a TWT service period (SP) and a TWT interval associated with the apparatus. The apparatus may perform a communication with the network node during the TWT SP based on the TWT configuration at a contention-free stage.