Mobile Terminal Serving Cell Change Mechanism
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Solution Overview
Problem
In wireless communication systems, abrupt changes in signal strength, especially in urban environments, can lead to failed handoffs during communication sessions, resulting in dropped calls due to weak signal strength between the user equipment and the serving cell.
Innovation Solution
The mobile terminal monitors authorization for a serving cell change from a prearranged channel of the target cell, decodes data from either the source or target cell, and sends confirmation upon authorization, ensuring reliable and fast serving cell changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the mobile terminal waits for handoff authorization from the source cell before switching to the target cell, then the handoff process can be coordinated properly, but the handoff speed is reduced and communication sessions may be terminated abruptly in urban environments with sudden signal changes
Solution Approach 1:
The mobile terminal performs preliminary actions by monitoring the target cell's prearranged channel for authorization before completing the handoff. This allows the terminal to prepare for handoff in advance and execute it quickly when authorization is received, resolving the contradiction between reliability and speed.
Solution Approach 2:
The system implements feedback by having the mobile terminal continuously monitor the target cell's channel for authorization signals. This feedback mechanism ensures that handoff only occurs when the network authorizes it, maintaining reliability while enabling fast execution when conditions are favorable.
2Reliability
If the mobile terminal monitors and decodes signals from both source and target cells simultaneously, then handoff reliability is improved, but the device complexity and power consumption increase
Solution Approach 1:
The patent segments the signal monitoring process by having the mobile terminal monitor the target cell's prearranged channel separately from the source cell communication. This segmentation allows simultaneous monitoring of both cells without requiring full bidirectional decoding, reducing device complexity while maintaining handoff reliability.
3Reliability
If the mobile terminal sends handoff request messages through both source and target cells, then message delivery reliability is improved, but the loss of time due to multiple transmission paths increases
Solution Approach 1:
The network performs preliminary actions by pre-configuring the target cell with the mobile terminal's identity and authorization information before handoff is needed. This eliminates the need for time-consuming message exchanges during critical handoff moments, reducing time loss while maintaining reliability through pre-established communication paths.
Data Source
AI summary
In a wireless communication system in which a user using a mobile equipment requests a serving cell handoff from a source cell to a target cell, the mobile equipment monitors authorization for the handoff from the target cell. At the same time, the mobile equipment can decode data from either the source cell or the target cell. Upon receipt of authorization for the handoff, the mobile equipment sends confirmation of the handoff to the target cell.