Non-AP MLD Broadcast TWT Setup for Multi-Link Latency Reduction
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Solution Overview
Problem
Current wireless communication systems face challenges in supporting delay-sensitive applications like augmented reality and robotics due to high latency and low throughput, especially in multi-link operations.
Innovation Solution
The implementation of a non-access point (AP) multi-link device (MLD) that establishes multiple links with an AP MLD, allowing for the setup of target wake time (TWT) schedules across these links using a broadcast TWT operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple links are established for multi-link operation, then throughput is increased, but device complexity increases
Solution Approach 1:
The patent combines TWT schedule setup across multiple links into a single broadcast operation. The AP MLD establishes TWT schedules that apply to multiple links simultaneously through a single request frame exchanged on one link, merging what would otherwise require separate setup procedures for each link. This reduces the signaling overhead and procedural complexity while maintaining the ability to manage multiple links for high throughput.
Solution Approach 2:
The broadcast TWT mechanism provides universal TWT parameters that can be applied across multiple links. A single TWT schedule configuration serves multiple links universally, allowing the system to manage diverse link configurations through a unified approach. This multi-functionality reduces the need for link-specific TWT setup procedures while still enabling optimized throughput on each individual link.
2Reliability
If TWT schedules are set up individually on each link, then link-specific optimization is achieved, but latency increases due to multiple setup procedures
Solution Approach 1:
The broadcast TWT mechanism performs preliminary setup of TWT schedules across all necessary links in advance through a single operation. By establishing the TWT schedules beforehand on a broadcast basis, the system avoids the time-consuming sequential setup that would occur with individual link procedures. This preliminary action reduces latency while maintaining the ability to apply link-specific optimizations when needed.
Solution Approach 2:
The patent merges multiple individual TWT setup procedures into a single broadcast TWT operation. Instead of exchanging separate request and response frames for each link, the system combines these operations into one unified broadcast mechanism. This merging significantly reduces the time required for TWT schedule establishment while still allowing for link-specific parameter adjustments when required by the application.
3Loss of time
If broadcast TWT operation is implemented across multiple links, then setup time is reduced, but frame management complexity increases
Solution Approach 1:
The patent introduces an intermediary mechanism where the AP MLD acts as a central coordinator for broadcast TWT operations. The AP MLD receives a single TWT setup request and manages the distribution and coordination of TWT schedules across multiple links. This intermediary approach simplifies the overall frame management by centralizing control, reducing the complexity that would otherwise arise from distributed multi-link TWT coordination.
Solution Approach 2:
The broadcast TWT mechanism enables self-service operation where once the TWT schedules are established through the broadcast mechanism, each link autonomously operates according to its assigned schedule without requiring continuous coordination. The links self-manage their wake times and frame exchanges independently based on the pre-established broadcast schedules, reducing ongoing frame management complexity while maintaining rapid setup capability.
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 configured to: establish a plurality of links, including a first link between a first STA and a first AP and a second link between a second STA and a second AP; transmit, to the first AP on the first link, a request frame to request setup of one or more target wake time (TWT) schedules, wherein the request frame includes link identifier information that indicates the first link and the second link; receive, from the first AP on the first link, a response frame that accepts the request to setup the one or more TWT schedules, wherein the response frame includes the link identifier information that indicates the first link and the second link; and transmit, to the first AP, one or more frames based on a first TWT schedule.