EMLSR Operations in Non-AP Multi-Link Wireless Devices
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Solution Overview
Problem
Current wireless communication technologies, such as Wi-Fi 7, face challenges in enhancing latency and throughput for peer-to-peer (P2P) and tunneled direct link setup (TDLS) applications using pervasive multi-link single radio (EMLSR) operations in non-access point (non-AP) multi-link devices (MLDs).
Innovation Solution
The proposed solution involves a method and apparatus where non-AP MLDs exchange EMLSR capability information through a handshake procedure on multiple links, establishing EMLSR operations, and listening on available links to avoid unnecessary reattempts and reduce contention, thereby enhancing performance by switching to a common link for communication, even when the primary link is busy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If non-AP MLDs use traditional single-link communication mode, then device complexity is reduced, but latency and throughput performance deteriorates in high-network load scenarios
Solution Approach 1:
The patent segments the communication operation into two distinct modes: traditional single-link mode and EMLSR mode. The system divides the multi-link resource into multiple independent links that can be selectively activated. Non-AP MLDs exchange capability information to determine whether to use segmented multi-link operations or conventional single-link operations, allowing throughput enhancement without forcing complexity on all devices.
Solution Approach 2:
The patent implements dynamic communication mode selection where non-AP MLDs can switch between single-link and EMLSR modes based on real-time network conditions and peer capability. The system dynamically activates or deactivates specific links during communication sessions, allowing adaptive optimization of latency and throughput while managing device complexity through flexible mode transitions.
2Loss of time
If non-AP MLDs establish EMLSR operations on multiple links, then latency is reduced through parallel communication paths, but device complexity increases due to multi-link coordination requirements
Solution Approach 1:
The patent applies preliminary action by having non-AP MLDs exchange EMLSR capability information during the initial association phase with the AP. This capability negotiation occurs before actual data transmission, allowing both devices to pre-establish whether they support EMLSR operations. The system performs link availability assessment and mode selection in advance, reducing latency during actual communication while avoiding complex real-time decision-making.
3Reliability
If non-AP MLDs attempt communication on primary link only, then device complexity is minimized, but reliability deteriorates due to packet drops when primary link is busy
Solution Approach 1:
The patent implements beforehand cushioning by establishing alternative communication paths (secondary links) in advance during the EMLSR setup phase. When the primary link becomes busy or unavailable, the system has pre-configured backup links ready for immediate switching. This cushioning mechanism prevents packet drops by having fallback options available before communication failures occur, while maintaining reasonable device complexity through structured link management.
4Productivity
If non-AP MLDs use pervasive EMLSR operations across all links, then throughput is maximized, but AP contention opportunities are reduced due to increased multi-link operations
Solution Approach 1:
The patent applies local quality by allowing different links to serve different functions within the EMLSR framework. Not all links are used for identical purposes - some links may be optimized for data transmission while others handle control signaling or serve as backup paths. The system selectively activates links based on local network conditions and traffic requirements, maximizing throughput on critical paths while minimizing unnecessary multi-link operations that would reduce AP contention opportunities.
Data Source
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AI summary
Techniques pertaining to performance enhancement between non-access point, non-AP, multi-link devices, MLDs, by enhanced multi-link single radio, EMLSR, in wireless communications are described. A first non-AP MLD exchanges EMLSR capability information with a second non-AP MLD in a handshake procedure on one of a plurality of links (1010). The first non-AP MLD then establishes an EMLSR operation with the second non-AP MLD on one or more links of the plurality of links (1020). Each of the first non-AP MLD and the second non-AP MLD listens on at least one of the plurality of links.