Frame Exchange Context for Seamless MLD Roaming
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently and securely conveying communications signaling information during device roaming in multi-link communications, particularly in applications requiring high system throughput like video teleconferencing and HD video surveillance, where seamless handoffs and continuous connections are essential.
Innovation Solution
An access point (AP) device determines a frame exchange context for roaming non-AP devices, using a common Media Access Control (MAC) address to identify a group of APs and negotiate keys, and conducts frame exchanges based on this context, including information for downlink and uplink frame transmissions and receptions, ensuring seamless roaming and continuous connectivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If device roaming is implemented in multi-link communications, then device mobility and network coverage are improved, but maintaining continuous connections and high throughput during handoffs becomes difficult
Solution Approach 1:
The patent applies preliminary action by establishing a frame exchange context in advance that includes all necessary information (PTK, PN, sequence numbers, BA agreement parameters) before the actual handoff occurs. This pre-prepared context enables the target AP MLD to immediately resume seamless communication with the non-AP MLD upon handoff, eliminating connection interruptions and maintaining reliability during mobility transitions.
2Ease of operation
If frame exchange context information is transferred during roaming, then seamless handoff is achieved, but the complexity of key negotiation and information management increases
Solution Approach 1:
The patent merges multiple separate negotiation processes into a unified frame exchange context transfer mechanism. By combining PTK information, packet numbers, sequence numbers, and BA agreement parameters into a single contextual framework that is transferred from source to target AP MLD, the system simplifies the overall handoff procedure while maintaining all necessary security and communication parameters, thereby reducing operational complexity despite the comprehensive information exchange.
3Area of stationary object
If multiple AP MLDs are affiliated with a roaming MLD group, then network coverage and roaming capability are improved, but the difficulty of managing frame exchanges and maintaining security increases
Solution Approach 1:
The patent introduces an intermediary mechanism where a unified frame exchange context serves as the mediator between multiple AP MLDs in the roaming group and the non-AP MLD. This context acts as a standardized interface that simplifies management by providing a consistent framework for key negotiation, sequence number tracking, and BA agreement across all AP MLDs, thereby reducing the complexity of managing frame exchanges throughout the extended network coverage area.
Data Source
AI summary
Embodiments of a method and apparatus for communications are disclosed. In an embodiment, an access point (AP) device includes a controller configured to determine a frame exchange context for frame exchanges with a non-AP device roaming from a current serving AP MLD affiliated with a roaming MLD group identifying address to a new serving AP MLD affiliated with the roaming MLD group identifying address and a wireless transceiver configured to conduct the frame exchanges with the non-AP device based on the frame exchange context.