Wireless Handover via Base Station Controller Tunneling
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Solution Overview
Problem
Current wireless communication systems, particularly in Broadband Wireless Access (BWA), face limitations in providing efficient handover services due to interference and limited mobility, especially in high-speed data service systems like IEEE 802.16, which lack effective handover methods.
Innovation Solution
A handover method is introduced that involves a serving base station transmitting a handover request to a base station controller, determining target base stations, and establishing a tunnel between the base station controller and the target base station, allowing for efficient handover by reducing handover time through tunneling and optimizing communication without a ranging procedure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a conventional handover method is used in IEEE 802.16 system, then the system can provide basic connectivity, but the handover time is long and real-time services are not well supported
Solution Approach 1:
The patent applies preliminary action by establishing a tunnel between the base station controller and the target base station before the mobile station actually performs handover. The serving base station transmits a handover request message to the base station controller, which then sets up the tunnel in advance. This allows the handover to execute quickly when needed, as the communication path is already prepared, thereby reducing handover time while maintaining high handover speed
Solution Approach 2:
The patent uses an intermediary approach by introducing a tunnel as a intermediate communication path between the base station controller and target base station. This tunnel acts as a mediator that facilitates fast data forwarding during handover, eliminating the need for lengthy signaling procedures and enabling real-time services to continue without interruption during the handover process
2Loss of time
If handover procedures are simplified to reduce time, then handover speed improves, but signaling overhead and system complexity increase
Solution Approach 1:
The patent applies segmentation by dividing the handover process into distinct phases: tunnel establishment phase (before handover) and execution phase (during handover). The handover request message and confirm message are separated into different signaling steps, allowing the complex tunnel setup to be performed in advance when system resources are available, while the actual handover execution remains simple and fast, thus reducing perceived handover time without overwhelming the system with complexity at the critical moment
Data Source
AI summary
A handover method in a wireless communication system is disclosed. A serving base station transmits a handover request message to a base station controller in response to a handover request of a mobile station. The base station controller determines target base stations to which the mobile station can perform handover among target base stations in a list of neighbor base stations, and transmits a handover response message including the determination result information to the mobile station via the serving base station. The mobile station determines a target base station to which it will perform handover, and transmits a message indicating that it will perform handover, to the base station controller via the serving base station. The base station controller transmits a confirm message indicating that the mobile station will perform handover, to the determined target base station, and establishes a tunnel to the target base station. The mobile station registers itself in the target base station.