Multi-AP Association for Seamless Wireless Handover
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Solution Overview
Problem
In wireless networks, mobile stations often inefficiently manage handovers to new access points, leading to resource misuse and service interruptions due to incomplete network information and frequent disassociation with current APs.
Innovation Solution
Implementing a multi-link entity (MLE) associated with multiple access points, allowing seamless transitions by maintaining active and inactive links, and enabling stations to gather information about nearby APs through parameter advertisement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If mobile stations disassociate from current AP and associate with new AP when roaming, then signal strength is improved, but service interruption occurs
Solution Approach 1:
The patent applies preliminary action by having the mobile station associate with multiple APs in advance before actually needing to handover. The station maintains association with both current and candidate APs, pre-establishing the necessary links so that when handover is needed, the transition can occur without service interruption. This resolves the contradiction by preparing the connection infrastructure before the signal degradation occurs.
Solution Approach 2:
The patent implements dynamics by allowing the association state to be flexible rather than fixed. The mobile station can dynamically switch between different association states (disconnected, associating, connected) and can maintain multiple associations simultaneously. This dynamic approach enables seamless handovers by transitioning from one AP to another without breaking the connection, thus maintaining service continuity while optimizing signal strength.
2Speed
If mobile stations make handover decisions based on incomplete network information, then decision speed is improved, but network resource efficiency deteriorates
Solution Approach 1:
The patent applies preliminary action by having mobile stations perform network scanning and information gathering in advance while associated with multiple APs. The station collects network information parameters (such as signal strength, load, capabilities) before making handover decisions, so when a decision is needed, the information is already available. This maintains fast decision-making speed while improving resource efficiency by avoiding unnecessary handovers based on insufficient information.
Solution Approach 2:
The patent implements feedback mechanisms where mobile stations continuously monitor network conditions and AP parameters, and this information feeds back into the handover decision process. The station uses feedback from multiple APs about their respective network conditions to make more informed handover decisions, improving both the speed and efficiency of resource utilization by avoiding poor handover choices.
3Illumination intensity
If mobile stations frequently disassociate and re-associate with APs, then signal optimization is improved, but authentication overhead increases
Solution Approach 1:
The patent applies preliminary action by establishing associations with multiple APs in advance before signal degradation occurs. The mobile station pre-establishes associations and maintains them while moving, so when handover is needed, the authentication process has already been completed or can be resumed without re-authenticating from scratch. This reduces authentication overhead while maintaining signal quality optimization.
Solution Approach 2:
The patent implements continuity of useful action by maintaining active associations with multiple APs simultaneously rather than sequentially. The mobile station keeps the association process continuous and ongoing, so when moving between APs, the authentication and association actions are already in progress or can be resumed without interruption. This eliminates the time loss associated with frequent re-authentication while still allowing signal optimization through multiple AP associations.
Data Source
AI summary
This disclosure provides methods, components, devices and systems for multiple access point (AP) association with a single station (STA) to provide a seamless transition (e.g., little to no service interruption during an active link transfer). Some aspects more specifically relate to a multi-link entity (MLE) and multiple AP members of the MLE, and their communications with the STA.