WiFi Access Point Handover with Cellular Bridging for Continuity
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Solution Overview
Problem
Existing communication protocols struggle with seamless handovers between WiFi access points due to gaps in coverage and limitations in determining link quality, leading to interruptions in communication sessions, particularly for devices with limited WiFi capabilities.
Innovation Solution
A method involving a user equipment device that uses a connection identifier-based protocol to establish a handover between WiFi and cellular links, allowing for seamless transitions by initially communicating over WiFi, then switching to cellular during the handover period, and finally reverting to WiFi, with potential redundancy and error correction to ensure continuous communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a device switches from one WiFi access point to another during handover, then connectivity can be maintained across different coverage areas, but communication interruptions and packet loss occur due to gaps in coverage and protocol limitations
Solution Approach 1:
The system establishes a cellular link in advance before the WiFi handover completes, ensuring that communication can seamlessly transition to the cellular network if WiFi connectivity is lost during the handover process. This preliminary action prevents communication interruptions by having a backup pathway ready before the switch occurs.
Solution Approach 2:
The cellular network serves as an intermediary communication pathway during the WiFi handover process. When WiFi connectivity is interrupted during handover, the cellular link acts as a mediator to maintain communication, allowing the device to switch back to WiFi later without experiencing permanent communication breakdown.
2Loss of energy
If a device uses only WiFi for communication, then cost and bandwidth efficiency are improved, but communication reliability deteriorates when WiFi coverage gaps are encountered during handover
Solution Approach 1:
The system applies different communication qualities to different network conditions: WiFi is used for normal operation to maintain cost efficiency, while cellular is activated locally only when and where needed during handover transitions. This local quality approach ensures reliability is improved precisely where WiFi fails without sacrificing overall cost efficiency.
Solution Approach 2:
The system dynamically changes the network parameter being used for communication based on the current handover state. During normal operation, WiFi is the active network; during handover gaps, the system switches to cellular. This parameter change allows the system to maintain cost efficiency while improving reliability during critical transition periods.
3Stability of the object's composition
If a device establishes connections with multiple WiFi access points simultaneously, then handover smoothness is improved, but device complexity increases due to hardware limitations
Solution Approach 1:
The cellular network serves as an intermediary that enables smooth handover without requiring the device to simultaneously maintain multiple WiFi connections. By using cellular as a bridge during the transition, the system achieves handover smoothness while keeping the WiFi hardware configuration simple and compatible with single-chain devices.
Data Source
AI summary
A connection between two UEs is identified by a single connection identifier. Different streams are transmitted over different wireless links with potential redundancy between streams. Initially a first WiFi link is used to communicate with the second UE. After the first UE decides it will handoff to a second WiFi AP it establishes a connection with a cellular AP and then communicates a second stream corresponding to the same connection. The first and second streams initially communicate the same content. The first WiFi link is terminated, but the second stream continues to communicate content. The first UE then establishes a second WiFi connection with a second WiFi AP and communicates a third content stream of the first connection to second UE via second WiFi link. The third stream initially communicates information also communicated over second stream. The cellular link is terminated. The second WiFi link is used to communicate content.