BWA Handover System Using Neighbor BS Preamble Broadcasting
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Solution Overview
Problem
The IEEE 802.16e communication system has limited handover processes, particularly for supporting mobility and inter-sector handover in Broadband Wireless Access (BWA) communication systems, which restricts high-speed transmission and Quality of Service (QoS) in next-generation communication systems.
Innovation Solution
A method and system for handover in BWA communication systems that involve broadcasting preamble index information of neighbor Base Stations (BSs) or sectors, allowing Mobile Stations (MSs) to request and allocate scanning intervals to scan reference signals from multiple neighbor BSs or sectors, enabling high-speed handover by identifying optimal target BSs with multi-sector support.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the IEEE 802.16e communication system uses conventional handover processes, then the system structure is simple, but the handover capability is limited and cannot support high-speed mobility and inter-sector handover
Solution Approach 1:
The serving base station performs preliminary actions by broadcasting neighbor base station information (including BS identifiers and preamble indices) and allocating scanning intervals to mobile stations before handover is needed. This allows mobile stations to proactively scan and identify suitable target base stations in advance, enabling faster and more adaptable handover when mobility requirements arise.
Solution Approach 2:
The handover process is segmented into distinct phases: information broadcasting, scanning interval allocation, reference signal scanning, and handover execution. The neighbor base station information is segmented into identifiers and preamble indices, allowing mobile stations to efficiently process and evaluate multiple potential target base stations independently.
2Reliability
If the system implements detailed handover processes for mobility support, then handover capability improves, but the complexity of the system increases
Solution Approach 1:
The serving base station acts as an intermediary by collecting and broadcasting neighbor base station information, managing scanning interval allocations, and coordinating the handover process. This intermediary role simplifies the overall system complexity by centralizing control functions while enabling reliable mobility support through structured information exchange between base stations and mobile stations.
Solution Approach 2:
The system performs preliminary actions by pre-configuring mobile stations with neighbor base station information and scanning intervals before handover events occur. This preliminary preparation ensures reliable mobility support is available when needed without requiring complex real-time decision-making during actual handover transitions.
3Reliability
If mobile stations scan multiple neighbor BSs to find optimal target BS, then handover quality improves, but the time required for handover increases
Solution Approach 1:
The mobile station performs periodic scanning of reference signals from multiple neighbor base stations during allocated scanning intervals. This structured periodic scanning allows the mobile station to efficiently evaluate multiple potential target base stations and identify the optimal handover target while maintaining controlled timing, thus improving handover quality without excessive time loss.
Solution Approach 2:
The serving base station provides preliminary information about neighbor base stations including identifiers and preamble indices, enabling mobile stations to quickly identify and scan only relevant target base stations. This preliminary information provision reduces the effective scanning time required while maintaining comprehensive evaluation of suitable handover targets.
Data Source
AI summary
Disclosed is a handover system in a BWA communication system. In the system, a serving BS broadcasts neighbor BS information including BS identifiers of a plurality of neighbor BSs and reference signal indices indicating reference signals used by the neighbor BSs, a MS receives the neighbor BS information and requests a scanning interval to the serving BS at a timing point at which the MS wants to perform a scanning, the serving BS allocates the scanning interval to the MS in response to a request for the scanning interval, and the MS scans reference signals received from the neighbor BSs during the scanning interval in response to the neighbor BS information.