Cell Reselection Update for Packet Mode Cellular Systems
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Solution Overview
Problem
In packet mode cellular mobile radio systems, cell reselection processes can fail or be abandoned due to various reasons such as mobile stations deciding to remain in the current cell or changing to a standby state, leading to suspended or failed data transfers, with existing solutions not optimally addressing these issues.
Innovation Solution
A method where the mobile station sends a cell update message indicating the initial server cell as the new cell if it cannot connect to the target reselected cell, allowing for resumed downlink data transfer once the cell update message is received, and this information is transmitted in acknowledged mode using a 'Cell Update' message.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the mobile station autonomously decides to reselect a target cell and attempts to connect to it, then the mobile station can optimize its connection based on measurement results, but the data transfer may be suspended or failed if the reselection fails or is abandoned
Solution Approach 1:
The mobile station sends a cell update message to the network to feedback the reselection result. When the mobile station cannot connect to the target reselected cell, it sends the cell update message indicating the initial server cell as the new cell, allowing the network to resume downlink data transfer and ensuring reliable data transmission while maintaining autonomous reselection capability
Solution Approach 2:
The mobile station performs cell reselection measurements and decisions in advance before data transfer is affected. By autonomously evaluating measurement results and selecting target cells beforehand, the mobile station can switch connections proactively while the network is notified through the cell update message mechanism to maintain data transfer continuity
2Reliability
If the network controls the cell reselection by sending a Packet Cell Change Order message, then the network can ensure optimal cell selection, but the system complexity and signaling overhead increase
Solution Approach 1:
The mobile station performs autonomous cell reselection based on its own measurements and decisions, serving itself in the cell selection process. This self-service approach reduces network control complexity and signaling overhead while maintaining reliable cell selection through the mobile station's autonomous evaluation of measurement results
3Productivity
If the mobile station sends a cell update message indicating the initial server cell when target cell connection fails, then the data transfer can be resumed efficiently, but additional signaling is required
Solution Approach 1:
When the mobile station cannot connect to the target cell, it discards the failed reselection attempt and recovers by sending a cell update message indicating the initial server cell as the new cell. This allows the network to resume downlink data transfer efficiently, recovering from the reselection failure with minimal information loss since the cell update message provides sufficient information for resumption
Data Source
AI summary
A method of reselecting cells in a packet mode cellular mobile radio system, which method includes a step in which a mobile station connected in packet mode to a server cell attempts to connect in packet mode to a target reselected cell, which method is essentially characterized in that if the mobile station cannot connect to the target reselected cell, it sends the network cell update information indicating its server cell as the new cell.