Link-Level Roaming for Non-AP Multi-Link Devices
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Solution Overview
Problem
Existing wireless network technologies face challenges in seamless roaming for non-access point multi-link devices (MLDs) between different access point MLDs, leading to disruptions in frame exchanges and inefficient resource management during the roaming process.
Innovation Solution
The implementation of a multi-link communications system that allows non-AP MLDs to maintain links with both serving and target AP MLDs as non-simultaneous transmit receive (NSTR), multi-link single radio (MLSR), or enhanced MLSR (eMLSR) pairs, enabling smooth roaming by terminating links with the serving AP MLD and establishing new links with the target AP MLD, while managing frame exchanges and distributed system mapping changes to optimize communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If non-AP MLD maintains links with both serving and target AP MLDs during roaming, then seamless roaming without reassociation is achieved, but device complexity increases due to managing multiple simultaneous links
Solution Approach 1:
The patent implements dynamic link management where the non-AP MLD can flexibly establish, maintain, and terminate links with different AP MLDs based on roaming needs. During roaming, the device dynamically maintains connections with both serving and target AP MLDs, then transitions to a single link after roaming completion, allowing adaptive complexity management.
Solution Approach 2:
The roaming process is segmented into distinct phases: initial link establishment with target AP MLD while maintaining serving AP MLD connection, temporary dual-link roaming stage, and final link consolidation. This segmentation allows complex multi-link management to be broken down into manageable sequential steps.
2Productivity
If non-AP MLD deletes all links with serving AP MLD and sets up links only to target AP MLD, then resource allocation is simplified, but frame exchanges are disrupted during the transition
Solution Approach 1:
The patent establishes the link with the target AP MLD before terminating the link with the serving AP MLD. This preliminary action ensures that a communication path is already available before the old path is removed, preventing disruptions in frame exchanges during the transition.
Solution Approach 2:
The patent maintains continuous frame exchange capability throughout the roaming process by ensuring that at least one active link to an AP MLD is always available. The transition from serving to target AP MLD is performed in a way that preserves uninterrupted data and control frame exchanges.
3Productivity
If roaming domain size is increased to reduce transitions between roaming domains, then roaming frequency decreases, but coverage area requirements increase
Solution Approach 1:
The patent enables non-AP MLDs to perform self-directed roaming within the roaming domain by establishing direct links with target AP MLDs based on their own measurements and decisions, without requiring centralized coordination. This allows efficient local roaming management that reduces unnecessary transitions while maintaining appropriate domain sizes.
Data Source
AI summary
Non-access point (non-AP) multi-link device (MLD) roaming among a serving AP MLD and a target AP MLD of a roaming domain is disclosed. Links are set up from the non-AP MLD to the serving AP MLD. The non-AP MLD affiliated with the roaming domain initiates a link-level roaming setting up a link to the target AP MLD, wherein respective links are set up from the non-AP MLD to the serving AP MLD and target AP MLD. A type of links from the non-AP MLD to the serving AP MLD and target AP MLD is announced and the non-AP MLD terminates all links between the non-AP MLD and the serving AP MLD where the non-AP MLD has links set up only with the target AP MLD to complete the link-level roaming.