Wireless Handover Resource Reservation via Delay Prediction
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Solution Overview
Problem
Existing handover processes in wireless communication networks face challenges in minimizing handover drop probability while efficiently allocating resources, often reserving resources in anticipation of handover, which can exclude other mobile stations and applications from using them.
Innovation Solution
The system and method involve exchanging uplink/downlink time slot allocation information between serving and target base stations to accurately estimate handover delay, allowing the target base station to reserve resources only when necessary, thereby optimizing resource utilization and reducing unnecessary resource reservation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If resources are reserved in anticipation of handover, then handover drop probability is reduced, but resource utilization efficiency deteriorates
Solution Approach 1:
The patent applies preliminary action by having the target base station predict handover delay and reserve resources in advance, but only for the specific time window when handover is actually expected to occur. The prediction of handover delay allows the system to prepare resources proactively without committing them indefinitely, thus reducing handover drop probability while maintaining resource availability for other uses during non-handover periods.
Solution Approach 2:
The patent implements dynamics by making resource reservation adaptive and time-dependent rather than static. Resources are dynamically allocated based on predicted handover timing and delay, allowing the system to adjust resource availability in real-time. This dynamic approach ensures resources are reserved only when needed for handover while remaining available for other mobile stations during normal operation.
2Reliability
If resources are reserved exclusively for handover, then handover success probability is improved, but availability for other mobile stations deteriorates
Solution Approach 1:
The patent uses preliminary action to prepare handover resources in advance based on predicted handover delay, but this preparation is time-bound and conditional. Resources are reserved only for the predicted handover window, allowing other mobile stations to utilize resources outside this window. This resolves the contradiction by ensuring handover success through advance preparation without permanently excluding other users.
Solution Approach 2:
The patent changes the temporal parameter of resource allocation by introducing time-dependent resource reservation. Instead of static exclusive allocation, resources are allocated based on time windows derived from handover delay prediction. This parameter change allows the same resources to serve handover purposes during predicted handover periods and other mobile stations during normal periods, maintaining both handover success and resource versatility.
Data Source
AI summary
A serving base station provides time slot allocation information to a target base station for a mobile station that will likely undergo handover. The target base station uses the time slot allocation information to determine when resources should be reserved to facilitate the handover of the mobile station.