Multilink TWT Scheduling for Dense WLAN Traffic Control
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Solution Overview
Problem
Existing wireless LAN standards face challenges in efficiently supporting high-throughput and reliable communication in high-density environments, particularly in managing traffic transmission to optimize data speed and minimize transmission errors.
Innovation Solution
A wireless communication method and terminal that utilize multiple links and a Target Wake Time (TWT) mechanism to manage traffic transmission, allowing specific traffic identifiers (TIDs) during designated periods and restricting others, using enhanced distributed channel access (EDCA) to optimize channel access.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple links are used to increase throughput, then data transmission speed is improved, but device complexity and channel management difficulty increase
Solution Approach 1:
The patent divides the wireless communication channel into multiple independent links (first link and second link) operating on different frequency bands. Each link can be managed separately with independent channel access procedures, allowing the system to achieve high throughput through parallel transmission while reducing the complexity of managing each individual link compared to managing a single congested channel.
Solution Approach 2:
The patent introduces a new dimension for channel access by implementing separate EDCA (Enhanced Distributed Channel Access) procedures for each link. This multi-dimensional approach to channel management allows simultaneous access on multiple links with different parameters, increasing productivity while keeping each link's management relatively simple.
2Use of energy by moving object
If TWT mechanism restricts traffic transmission to specific TIDs during TWT periods, then power consumption is reduced and channel access is optimized, but transmission flexibility decreases
Solution Approach 1:
The patent implements a periodic TWT (Target Wake Time) mechanism where traffic transmission is scheduled in regular intervals. During designated TWT periods, only specific TIDs (Traffic Identifiers) are allowed to transmit, creating a periodic pattern that reduces power consumption by keeping devices in sleep mode between periods while maintaining necessary transmission flexibility through the scheduled access opportunities.
Solution Approach 2:
The patent applies different transmission rules to different TIDs locally. Instead of uniformly restricting all traffic, the system allows specific TIDs to transmit during TWT periods while restricting others, enabling power optimization for non-critical traffic while maintaining flexibility for time-sensitive or high-priority traffic types.
3Productivity
If EDCA optimizes channel access for high-density environments, then channel utilization is improved, but access conflict and interference increase
Solution Approach 1:
The patent segments the channel access mechanism into separate EDCA procedures for each link. By dividing the overall channel access into independent segments on different links, the system improves total channel utilization while reducing interference on any single link, as devices can access different links at different times with independent backoff counters and contention windows.
Solution Approach 2:
The patent adds a multi-link dimension to channel access optimization. Instead of all devices competing on a single channel, devices can access multiple links with independent EDCA parameters, increasing overall utilization while distributing and reducing interference across multiple dimensions of the wireless medium.
Data Source
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AI summary
Disclosed are a traffic transmission method and device, the method being performed by a terminal in a wireless communication system. Specifically, a non-access point (AP) STA of the present invention can receive, from an AP, a trigger frame triggering the transmission of a physical layer protocol data unit (PPDU). The trigger frame includes information indicating at least one traffic identifier (TID) that is allowed to be transmitted in a target wake time (TWT) period. The TWT period may indicate a period in which the transmission of traffic for the at least one TID having a specific transmission condition is allowed, and the transmission of traffic not having the specific transmission condition is restricted. Thereafter, the non-AP STA transmits a PPDU, including the traffic corresponding to the at least one TID, to the AP within the TWT period.