Handover Method for Wireless Communication Systems
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Solution Overview
Problem
In wireless communication systems, high-speed mobile stations face handover delays and service quality issues due to the selection of neighboring base stations based solely on radio signal strength, leading to potential handover failures when the chosen station lacks sufficient radio resources.
Innovation Solution
A method where a mobile station measures and updates a list of neighboring base stations with acceptable radio signal quality and resource availability, sharing this information with the serving base station to select a target base station that can accept the handover, thereby improving handover success rates and reducing delays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the mobile station selects a target base station based on only radio signal strength, then the handover process is simple and fast, but the selected base station may not have sufficient radio resources to accept the handover
Solution Approach 1:
The mobile station performs preliminary measurement of radio signal strength from multiple neighboring base stations and maintains an updated list of measurable base stations before handover is needed. This preliminary action enables the mobile station to quickly select an appropriate target base station when handover is required, resolving the contradiction between handover speed and success rate.
Solution Approach 2:
The mobile station continuously monitors and measures radio signal strength from neighboring base stations, feeding this information back to update the list of measurable base stations. This feedback mechanism ensures that the mobile station has current information about available base stations, enabling reliable handover decisions while maintaining speed.
2Reliability
If the mobile station performs comprehensive measurement of neighboring base stations including resource state, then the handover success rate improves, but the handover delay time increases
Solution Approach 1:
The mobile station performs preliminary measurement and maintenance of the list of measurable base stations with their radio signal strength information. This preliminary action is performed continuously in the background, so when handover is needed, the mobile station can quickly access the pre-measured information without causing significant delay, thus improving success rate without substantially increasing handover delay time.
3Productivity
If the mobile station uses simple radio signal strength measurement, then the measurement process is fast and low-complexity, but the selected base station may be incorrect due to insufficient resource assessment
Solution Approach 1:
The mobile station performs preliminary measurement of radio signal strength from multiple neighboring base stations and maintains an updated list of measurable base stations. This preliminary measurement action is performed continuously and efficiently, providing accurate base station selection information when needed without significantly impacting measurement speed or overall system performance.
Data Source
AI summary
The present invention relates to a handover method of a mobile station in a wireless communication system, and a base station and a mobile station for the same. A list of neighboring base stations that can accept a handover of a mobile station is shared by the mobile station and a serving base station before the mobile station performs the handover so as to reduce handover delay time in a high speed environment through addition, the active base station set managed by the mobile station and the serving base station can be managed with consideration of radio signal quality and resource state of each of the neighboring base stations included in the active base station set, and thus when the mobile station attempts a network re-entry process to a target base station that is not ready for the handover of the mobile station due to a loss of a handover control message, a handover failure due to a lack of radio resources can be prevented, thereby increasing a handover success rate.