Proxy Cell for Wireless Mobility Handling
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Solution Overview
Problem
In wireless communication systems, mobility procedures between terrestrial and non-terrestrial networks are inefficient due to long distances and cell ID reusing issues, leading to transmission delays and improper cell identification when the target cell is not a candidate cell configured by the source cell.
Innovation Solution
A method and device that configures a proxy cell to store user plane and control plane information associated with a communication device, allowing the target cell to retrieve data from the proxy cell instead of the source cell, and provides authentication information for proper cell identification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the target cell retrieves data directly from the source cell over long distances, then the mobility procedure can be completed, but transmission delay increases significantly
Solution Approach 1:
The patent introduces a proxy cell as an intermediary entity between the source cell and target cell. The proxy cell stores user plane information and control plane information locally, allowing the target cell to retrieve data from the nearby proxy cell instead of communicating directly with the distant source cell. This mediator approach resolves the transmission delay issue while maintaining data accessibility.
Solution Approach 2:
The proxy cell pre-stores user plane information and control plane information from the source cell before the handover occurs. This preliminary action ensures that when the target cell needs this data during mobility procedure, it can immediately access locally cached information rather than requesting it from the source cell, thereby reducing transmission delay.
2Ease of operation
If the UE determines a target cell based on measured signal strength without candidate cell configuration, then the UE can select the best cell, but the target cell cannot uniquely identify the source cell when cell IDs are reused
Solution Approach 1:
The proxy cell acts as an intermediary that maintains the unique identification relationship. When the target cell needs to identify the source cell, it can obtain the source cell's unique identifier through the proxy cell, which stores this information. This resolves the identification ambiguity caused by cell ID reuse while allowing flexible cell selection.
Solution Approach 2:
The proxy cell creates a copy of the source cell's identification information and other relevant data. This copied information is stored at the proxy cell location, enabling the target cell to access accurate source cell identification without relying on potentially reused cell IDs in the radio environment.
3Adaptability or versatility
If cell IDs are reused across different NTN and TN cells to increase resource utilization, then network capacity improves, but the target cell cannot distinguish between source cell and other cells with same ID
Solution Approach 1:
The proxy cell serves as a mediator that resolves the identification complexity. It stores the mapping relationship between cell IDs and their corresponding source cells, allowing the target cell to query the correct source cell identity through the proxy cell without directly handling the complexity of ID reuse resolution.
Data Source
AI summary
A method of handling mobility of a communication device for a cell of a base station. The method comprising configuring a proxy cell for a communication device; and transmitting a mobility configuration comprising information of the proxy cell and at least one candidate cell to the communication device; wherein the proxy cell stores information of a user plane, information of a control plane, or data associated with the communication device.