Wireless LAN Multi-Link TWT Operation for Power Saving
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Solution Overview
Problem
Existing IEEE 802.11 standard STAs are limited to performing Target Wake Time (TWT) operations through a single link, lacking the ability to efficiently utilize multiple links for power-saving TWT operations.
Innovation Solution
A method for a first STA to transmit and receive TWT setup messages across multiple links, configuring a TWT service period based on these messages to maintain one link in an awake state and another in a doze state, enabling TWT operations across multiple links.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If TWT operation is performed through a single link in multi-link systems, then device complexity is reduced and operation is simpler, but power saving efficiency is limited and communication capability is underutilized
Solution Approach 1:
The patent segments the TWT operation into separate procedures for each link. The AP and STA independently perform TWT setup, extension, and termination operations on a per-link basis, allowing selective activation of TWT on specific links while maintaining others in active state. This segmentation enables fine-grained power management where each link can be independently controlled to enter doze or awake states based on traffic requirements.
Solution Approach 2:
The patent implements dynamic TWT operation where the AP and STA can flexibly activate or deactivate TWT on individual links based on real-time traffic conditions. The system transitions between static single-link TWT and dynamic multi-link TWT configurations, allowing links to be dynamically switched between awake and doze states to optimize both power consumption and communication performance.
2Adaptability or versatility
If TWT operation is restricted to one link, then message transmission and operation management are simpler, but communication capability and power saving efficiency are limited
Solution Approach 1:
The patent divides the TWT management functionality into separate, independent procedures for each link. The AP maintains separate TWT state information for each link, and TWT setup requests and responses are processed independently per link. This segmentation allows the system to support multiple link configurations (single-link TWT, multi-link TWT, selective-link TWT) without increasing operational complexity significantly.
Solution Approach 2:
The patent creates a universal TWT framework that can operate in multiple modes: single-link TWT for simplicity, multi-link TWT for enhanced capability, or selective activation on specific links. The same basic TWT setup and management procedures are universally applied across all links, with the flexibility to enable or disable TWT on individual links based on traffic requirements, thereby achieving adaptability without proportionally increasing complexity.
Data Source
AI summary
A method performed by a first STA in a wireless local area network (WLAN) according to various embodiments may comprise transmitting or receiving a TWT setup request message and a TWT setup response message. The first STA may perform a TWT operation on the basis of the TWT setup request message and the TWT setup response message. The TWT setup request message and the TWT setup response message may be transmitted or received through a first link included in multiple links. The first STA may set the first link to be in an awake state in order to perform the TWT operation through the first link.