Wireless Handover Using Random Access Preamble for Interruption Reduction
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Solution Overview
Problem
Current wireless communication systems experience call interruptions and complexity during handover processes due to signaling delays and contention issues, leading to increased Frame-Error Rates and inefficient preamble management.
Innovation Solution
A handover procedure that minimizes interruption time by using a random access channel preamble as a temporary mobile equipment identifier, allowing the source base station to initiate the handover process and switch connections to a target base station without real-time coordination, thereby reducing the need for complex preamble reservation and management at the target base station.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the mobile station uses current handover procedures with real-time coordination, then connection reliability is maintained, but handover interruption time increases to 10-20 ms
Solution Approach 1:
The source base station pre-generates and assigns a dedicated random access preamble to the mobile station before handover occurs. This preliminary assignment eliminates the need for the mobile station to perform random access contention resolution during handover, thereby reducing interruption time while maintaining connection reliability through pre-coordinated resources.
2Reliability
If the target base station implements contention-free preamble reservation, then RACH transmission conflicts are avoided, but device complexity increases due to real-time processing requirements
Solution Approach 1:
The preamble reservation and management functions are extracted from the target base station and relocated to the source base station. The source base station generates and assigns dedicated preambles to mobile stations before handover, eliminating the need for the target base station to perform complex real-time preamble reservation processing while still achieving contention-free access.
3Reliability
If multiple RACH preambles are reserved for multiple mobile stations, then contention-free handover is achieved, but loss of time increases due to extended reservation duration
Solution Approach 1:
The source base station creates copies of dedicated preambles and assigns them to multiple mobile stations that need to handover to the same target base station. Each mobile station receives a unique preamble copy, enabling simultaneous contention-free handover without requiring the target base station to maintain long-term reservations for multiple preambles.
Data Source
AI summary
A method and apparatus for handover in a wireless communication system. A handover indication can be received from a source base station (120) that is connected with a mobile station (110). The handover indication can include a random access channel preamble. The random access channel preamble can include a temporary mobile equipment identifier. The random access channel preamble can be received from the mobile station. A timing advance message can be sent in response to receiving random access channel preamble. The timing advance message can be addressed by the random access channel preamble and a source base station identifier. The connection with the mobile station can be switched from the source base station to a target base station (130).