Soft Handoff Mechanism for Seamless Wireless Data Transfer
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Solution Overview
Problem
Current wireless communication systems face disruptions and data loss when devices switch between base stations, particularly with sophisticated applications like VoIP, due to the overhead of disconnecting and reconnecting, leading to issues such as disjointed call connections.
Innovation Solution
A device maintains simultaneous connections to multiple wireless networks using a single radio, allowing it to receive and compare multiple data copies, select the best representation, and send data through multiple connections, thereby reducing redundancy and ensuring seamless data transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a device switches from one base station to another, then the device can maintain coverage area mobility, but data transfer continuity is disrupted causing disjointed connections
Solution Approach 1:
The device performs preliminary actions by establishing connections with multiple base stations before actually needing to switch. The device proactively connects to candidate base stations in advance, so when a switch is needed, the transition is seamless rather than disruptive. This is achieved through background scanning and pre-authentication processes that prepare alternative connections before they are required.
Solution Approach 2:
The patent implements soft handoff by creating duplicate data transmission paths through multiple base stations. Data is copied and transmitted through both the current base station and candidate base stations simultaneously, ensuring that if one connection fails or degrades, the other maintains continuity. This redundancy eliminates single points of failure in the data transfer path.
2Reliability
If multiple connections are maintained simultaneously, then data transfer continuity is improved, but device complexity increases
Solution Approach 1:
The patent introduces an intermediary layer in the form of a protocol stack that manages multiple radio interfaces. This intermediary handles the complexity of maintaining simultaneous connections to multiple base stations, performing functions like connection prioritization, data routing, and coordination between different radio interfaces. This abstraction layer shields the application layer from the complexity of multi-connection management.
Solution Approach 2:
The device segments its radio capabilities into multiple independent radio interfaces, each capable of maintaining separate connections to different base stations. This segmentation allows the device to manage complexity by dividing the radio resource management task across multiple specialized interfaces rather than requiring one interface to handle all connections simultaneously.
3Area of stationary object
If connection switching is performed, then coverage area is extended, but authentication overhead increases causing delays
Solution Approach 1:
The device performs preliminary authentication with candidate base stations during background scanning and connection establishment phases. By completing authentication procedures in advance while in range of potential base stations, the device eliminates the need for time-consuming authentication when actually switching connections. This pre-authentication is done transparently during normal operation when the device is already connected to a base station.
Solution Approach 2:
The patent maintains continuous authentication sessions with multiple base stations simultaneously through soft handoff. Instead of breaking the authentication state during switching, the device maintains continuous authenticated connections with both current and candidate base stations, allowing seamless transition without re-authentication. The authentication context is preserved across base station transitions.
Data Source
AI summary
Various embodiments enable a device to maintain a plurality of connections to a plurality of wireless networks simultaneously using one radio. For instance, a device can partition in time, or “time-slice”, when it transmits and receives data such that a device can maintain a plurality of connections with a plurality of networks concurrently. With the plurality of connections, the device can receive multiple copies of data. In some embodiments, a device can compare multiple copies of data and determine which copy of data is a best representation. Once a best representation has been determined, it can be selected for further usage.