Variable Uplink Grant Time Reduces Handover Interruption
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing IEEE 802.16e handover procedures result in unnecessary communication interruption time during hard handover due to inefficient use of action time, leading to latency issues.
Innovation Solution
A method is introduced that utilizes a variable uplink grant time, allowing the mobile station to transmit a handover indication message after the uplink grant time, which is determined based on the action time and frame structure, enabling efficient use of action time to reduce communication interruption time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the mobile station waits for the action time to receive the fast ranging information element, then the handover procedure follows the standard protocol, but the communication interruption time increases due to unnecessary standby state
Solution Approach 1:
The mobile station performs preliminary actions by transmitting the handover indication message before the action time arrives and before receiving the fast ranging information element. This allows the handover preparation to start earlier, eliminating the unnecessary standby state and reducing communication interruption time.
Solution Approach 2:
The mobile station skips the traditional sequential waiting process by rushing through the handover indication transmission earlier in the process. Instead of waiting for action time and fast ranging information element reception, the mobile station proceeds with handover indication transmission as soon as possible, thereby shortening the overall handover duration.
2Loss of time
If the mobile station transmits the handover indication message earlier, then the communication interruption time is reduced, but the uplink grant timing must be optimized to avoid conflict
Solution Approach 1:
The uplink grant time is made dynamic and variable rather than fixed. The base station configures different uplink grant times adaptively based on the handover scenario, allowing the mobile station to transmit the handover indication message at the earliest possible moment without conflict. This dynamic timing management resolves the contradiction between early transmission and timing coordination.
Solution Approach 2:
The system changes the parameter of uplink grant time from a fixed value to a variable that can be adjusted based on handover requirements. By modifying this timing parameter dynamically, the system enables earlier handover indication transmission while maintaining proper uplink grant coordination, thus reducing interruption time without excessive complexity.
3Productivity
If the base station uses a fixed uplink grant time, then the scheduling is simple, but the handover efficiency is reduced due to unnecessary waiting time
Solution Approach 1:
The base station implements dynamic uplink grant time scheduling instead of fixed timing. This allows the base station to assign earlier uplink grant times to mobile stations performing handover, enabling faster handover indication transmission. The dynamic scheduling mechanism adjusts timing based on handover needs, improving handover efficiency while maintaining manageable scheduling complexity.
Solution Approach 2:
The base station changes the uplink grant time parameter from a fixed configuration to a variable that can be adjusted per handover event. This parameter change enables the system to optimize timing for handover scenarios specifically, improving handover productivity without requiring a completely complex scheduling overhaul.
Data Source
AI summary
A method for performing handover to reduce an interruption time is disclosed. A method for performing handover using a variable uplink grant time comprises transmitting a handover request message to a base station, receiving a handover response message from the base station, the handover response message including an uplink grant time, and receiving an uplink grant from the base station if the uplink grant time comes, and transmitting a handover indication message to the base station. Thus, an unnecessary interruption time during hard handover can be reduced by efficiently improving use of an action time, and an action suitable for a frame structure of the IEEE 802.16m can be performed.