Multi-link TWT Suspension via Cross-Link Frames
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently managing target wake time (TWT) agreements across multiple links in multi-link operation (MLO) scenarios, particularly for delay-sensitive applications that require low latency and high throughput.
Innovation Solution
The implementation of a non-access point (AP) multi-link device (MLD) and an access point (AP) MLD, each equipped with a processor configured to establish multiple links and manage TWT agreements. This involves transmitting frames across links to suspend or resume TWT schedules, ensuring coordinated power management and reduced latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If TWT agreements are managed independently on each link, then device complexity is reduced, but latency increases and throughput decreases for delay-sensitive applications
Solution Approach 1:
The patent merges TWT management across multiple links by allowing a TWT agreement established on one link to be suspended or affected by frames transmitted on another link. The AP MLD coordinates TWT schedules across links, enabling centralized control that reduces latency for delay-sensitive applications while maintaining manageable complexity through unified TWT state management.
Solution Approach 2:
The patent introduces an intermediary mechanism where frames transmitted on one link can carry TWT suspension information that affects TWT agreements on other links. This intermediary frame structure enables cross-link coordination without requiring complex direct management between all link components, resolving the contradiction by providing mediated TWT control.
2Productivity
If multiple TWT agreements are maintained across multiple links, then throughput increases for parallel data streams, but device complexity and coordination overhead increase
Solution Approach 1:
The patent makes the TWT management mechanism universal across multiple links by designing frames that can suspend or affect TWT agreements on any link from which they are transmitted. This multi-functional frame structure allows a single TWT management approach to handle multiple links uniformly, enabling high throughput across parallel data streams without proportionally increasing coordination complexity.
3Loss of time
If TWT schedules are suspended on one link due to traffic on another link, then latency is reduced for urgent data, but information coordination complexity increases
Solution Approach 1:
The patent implements feedback mechanisms where frames transmitted on one link provide information about TWT suspension status to the receiving end, which then coordinates with other links. This feedback loop ensures that TWT state changes on one link are communicated to affect appropriate TWT agreements on other links, reducing latency for urgent data while maintaining information synchronization through structured feedback messages.
Data Source
AI summary
A non-access point multi-link device (non-AP MLD) in a wireless network, the non-AP MLD comprising a memory and a processor coupled to the memory, the processor configured to establish a first link between a first station (STA) affiliated with the non-AP MLD and a first AP affiliated with an AP MLD, establish a second link between a second STA affiliated with the non-AP MLD and a second AP affiliated with the AP MLD, establish a target-wake-time (TWT) agreement or a TWT schedule on the first link between the first STA and the first AP, and transmit, from the first STA to the first AP on the first link, a frame intended for the second AP operating on the second link, wherein the frame includes information regarding when the TWT agreement or the TWT schedule established on the second link is suspended.