Trigger-Frame NAV Updates for Dense Wireless Channel Access
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing wireless communication technologies face challenges in efficiently using bandwidths for simultaneous data transmission between multiple terminals in high-density environments, particularly indoors and outdoors, where interference and channel contention are prevalent.
Innovation Solution
A wireless communication terminal that includes a processor configured to update a Network Allocation Vector (NAV) based on trigger frames, allowing for transmission of trigger-based Physical layer Protocol Data Units (PPDUs) regardless of existing NAV values, channel sensing results, and receiver addresses, to optimize channel access and reduce interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional NAV update mechanisms are used in high-density wireless environments, then channel access control is maintained, but bandwidth utilization efficiency deteriorates and interference increases
Solution Approach 1:
The patent implements dynamic NAV update mechanisms where terminals can selectively update NAV based on trigger frame conditions. The NAV update is made conditional rather than mandatory, allowing the system to adapt to high-density environments by updating NAV only when necessary, thereby improving bandwidth utilization while controlling interference.
Solution Approach 2:
The patent changes the parameter update behavior by allowing terminals to update NAV based on specific conditions in trigger frames rather than uniformly updating NAV for all received frames. This conditional parameter update approach optimizes channel access control in high-density scenarios, balancing efficiency and interference management.
2Productivity
If NAV is updated for all received frames, then channel access control is maintained, but transmission opportunities are lost due to unnecessary channel deferral
Solution Approach 1:
The patent applies partial action by updating NAV only for specific types of frames or under specific conditions rather than for all received frames. This selective NAV update prevents unnecessary channel deferrals and transmission delays, improving overall transmission efficiency while maintaining adequate channel access control.
Solution Approach 2:
The patent enables terminals to make preliminary decisions about NAV updates based on frame type and transmission context before actually updating the NAV. This preliminary assessment prevents unnecessary NAV updates that would cause unnecessary channel deferrals and transmission delays.
3Reliability
If channel sensing is performed before each transmission, then collision avoidance is improved, but transmission latency increases
Solution Approach 1:
The patent implements periodic channel sensing rather than continuous sensing before each transmission. Terminals perform channel sensing at specific intervals or under specific conditions triggered by frame reception, reducing the frequency of sensing operations while maintaining adequate collision avoidance capability, thereby lowering transmission latency.
Solution Approach 2:
The patent performs channel sensing in advance based on trigger frame reception rather than immediately before each transmission attempt. This preliminary sensing approach, combined with conditional NAV updates, allows terminals to prepare for transmission earlier, reducing actual transmission latency while maintaining collision avoidance.
Data Source
AI summary
Provided is a wireless communication terminal that communicates wirelessly. The wireless communication terminal includes a transceiver and a processor. The processor is configured to receive the trigger frame using the transceiver and update the network allocation vector based on the trigger frame. At this time, the trigger frame triggers transmission of at least one wireless communication terminal.