WLAN TXOP Sharing by Non-AP STAs to Cut Contention
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing WLAN systems face issues with redundant contention, collisions, and underutilized TXOPs due to a lack of coordination across devices, particularly in group-based or dense network environments, leading to inefficiencies in medium access and TXOP utilization.
Innovation Solution
Implementing joint medium access and TXOP sharing mechanisms initiated by non-AP STAs, allowing them to independently obtain and delegate TXOPs, and coordinate transmissions within a group using control frames, reducing dependence on centralized AP control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional distributed channel access mechanisms are used, then each STA can independently access the medium, but redundant contention and collisions occur leading to underutilized TXOPs
Solution Approach 1:
The patent segments the TXOP into multiple sub-TXOPs that can be independently allocated to different STAs within a group. This segmentation allows coordinated access where one STA obtains the TXOP and then shares it with other group members through control frames, eliminating redundant contention while maintaining independent access capabilities.
Solution Approach 2:
The patent introduces a group leader STA as an intermediary that coordinates access for multiple STAs. The group leader obtains the TXOP through contention and then distributes sub-TXOPs to other group members using control frames, acting as a mediator that reduces overall contention while enabling efficient group-based access.
2Ease of operation
If TXOP sharing is initiated by AP, then centralized coordination is achieved, but delays occur in P2P communication and relay scenarios
Solution Approach 1:
The patent merges the benefits of centralized coordination with distributed initiation by allowing non-AP STAs to independently obtain TXOPs and initiate sharing within their groups. This combines the simplicity of centralized control with the speed of distributed access, eliminating AP-dependent delays while maintaining coordination through group-based control frames.
Solution Approach 2:
The patent enables preliminary action by allowing non-AP STAs to obtain and initiate TXOPs without waiting for AP coordination. STAs can proactively acquire channel access and begin transmissions immediately, then coordinate with group members through control frames, eliminating the mandatory AP-initiated sequence and reducing access delays.
3Adaptability or versatility
If non-AP STAs independently obtain TXOPs, then access flexibility increases, but coordination complexity among group members increases
Solution Approach 1:
The patent uses a group leader as an intermediary to manage coordination complexity. While non-AP STAs can independently obtain TXOPs, the group leader receives control frames from members and coordinates sub-TXOP allocation, centralizing the coordination logic and preventing exponential complexity growth in multi-STA groups.
Solution Approach 2:
The patent creates a universal control frame structure that handles multiple coordination functions (TXOP sharing, sub-TXOP allocation, group member management) through a single standardized mechanism. This multi-functional control approach reduces coordination complexity by providing a unified interface rather than requiring separate protocols for each coordination scenario.
Data Source
AI summary
A method and system for wireless communication in a wireless local area network (WLAN) are disclosed. The method includes obtaining, by a non-access point (non-AP) station (STA), access to a wireless medium based on a contention-based channel access procedure; initiating, by the non-AP STA, upon obtaining access to the wireless medium, a transmit opportunity (TXOP); transmitting, by the non-AP STA, a control frame to a second STA during the TXOP; and receiving, by the non-AP STA, one or more physical layer protocol data units (PPDUs) from the second STA in accordance with scheduling information in the control frame.