Wireless Terminal Multiple Connection Management for Handoff Optimization
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Solution Overview
Problem
Conventional wireless communication systems face inefficiencies in handoffs, particularly in CDMA systems, where simultaneous transmission from multiple base stations can result in redundant signal copies, especially for higher bit rate IP data, leading to inefficiencies and increased interference.
Innovation Solution
A method and apparatus that allow a wireless terminal to establish and manage multiple connections with base stations, evaluate link preferences, and notify primary base stations of secondary connections, enabling data transfer over a preferred downlink connection, thereby optimizing handoffs and reducing redundant transmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If simultaneous transmission from multiple base stations is used in soft handoffs, then connection reliability is improved, but transmission efficiency deteriorates due to redundant signal copies
Solution Approach 1:
The patent segments the multiple base station connections into primary and secondary connections. The wireless terminal evaluates link quality metrics (signal strength, interference level, bit error rate) for each connection and selectively activates only the preferred connection for data transmission, rather than simultaneously using all connections. This segmentation resolves the contradiction by maintaining connection diversity for reliability while selecting a single optimal path for efficient transmission.
2Reliability
If multiple redundant over the air transmissions are used, then signal reliability is improved, but system resource utilization deteriorates
Solution Approach 1:
The patent implements feedback mechanisms where the wireless terminal continuously monitors link quality metrics including signal strength, interference level, and bit error rate for each base station connection. Based on this feedback, the terminal dynamically evaluates and selects the preferred connection for data transmission. This feedback-driven selection ensures reliable communication while optimizing system resource utilization by avoiding redundant transmissions on inferior links.
3Device complexity
If hard handoffs are used where radio link is dropped, then device complexity is reduced, but handoff time increases
Solution Approach 1:
The patent applies preliminary action by establishing and evaluating multiple base station connections before handoff is needed. The wireless terminal proactively monitors link quality metrics and identifies preferred connections in advance. When handoff becomes necessary, the terminal can quickly switch to the pre-evaluated preferred connection, significantly reducing handoff time while maintaining manageable device complexity through systematic link evaluation.
Data Source
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AI summary
Systems and methodologies are described that facilitate supporting multiple connections associated with a wireless terminal. Notifications may be provided to a primary base station upon establishment and/or removal of connections between the wireless terminal and secondary base station(s). Additionally, the multiple connections may be evaluated and a preferred connection from the set of multiple connections may be utilized to transfer data to the wireless terminal over a downlink connection.