Group Mobile Terminal Handover Optimization via Message Sequencing
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Solution Overview
Problem
The existing handover technology for group mobile terminals in cellular networks experiences a high failure rate due to the significant impact of handover and location update request messages on access resources, particularly when high-speed vehicles move between cells, leading to increased congestion and failure.
Innovation Solution
A method that involves obtaining a minimum backoff time value based on access parameters to delay non-handover request messages, such as location update requests, allowing handover request messages to be processed first by the base station, thereby reducing conflicts and failure rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If group mobile terminals send handover request messages and location update request messages simultaneously when moving between cells, then location management is maintained, but access resources are significantly impacted and handover failure rate increases
Solution Approach 1:
The patent applies preliminary action by having the mobile terminal send a location update request message before sending the handover request message. This sequence ensures that the location management function is established in advance, preventing resource conflicts during the handover process. The location update is performed proactively before the handover trigger occurs, thereby resolving the contradiction between maintaining location management and avoiding access resource congestion.
2Measurement precision
If location update request messages are sent immediately when entering a new location area, then location accuracy is maintained, but handover failure rate increases due to resource conflicts
Solution Approach 1:
The patent implements preliminary action by performing the location update operation before the handover is triggered. The mobile terminal determines that it has entered a new location area, sends the location update request message first, and only after this preliminary action is complete does it proceed to send the handover request message when the handover condition is met. This sequence maintains location accuracy while avoiding resource conflicts that would reduce handover success rate.
3Adaptability or versatility
If multiple messages are sent simultaneously during group mobile terminal handover, then communication functionality is maintained, but access resources are overwhelmed and handover fails
Solution Approach 1:
The patent applies preliminary action by establishing a specific message sending sequence: location update request messages are sent first as a preliminary step, followed by handover request messages. This sequential approach ensures that all necessary communication functions are maintained while preventing resource overload. The preliminary location update prepares the system in advance, allowing subsequent handover messages to be processed efficiently without causing resource conflicts.
Data Source
AI summary
A method for improving a handover success rate of a group of mobile terminals include obtaining a minimum backoff time value according to obtained access parameters, receiving a message from a mobile terminal after entering a new cell, and sending the message to a base station if the message is a handover request message. If the message is not a handover request message, the method includes sending the received message to the base station upon expiry of a predetermine time after the message is received. The predetermined time is greater than or equal to the minimum backoff time value, and the minimum backoff time value is a minimum time value of the predetermined time when the received message from the mobile terminal is not the handover request message.