Radio Base Station Context Retrieval for Connection Re-establishment
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Solution Overview
Problem
In mobile communication systems, when a radio base station does not store context information of a mobile station, connection re-establishment is denied, preventing the mobile station from establishing a new RRC connection with the selected radio base station.
Innovation Solution
A mobile communication method and radio base station configuration that allows the mobile station to perform cell selection, determine if context information is stored at the target radio base station, acquire context information from the original radio base station if not stored, and establish a new connection based on this information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the mobile station UE is configured to perform handover only to the cell controlled by the radio base station eNB in which the context information of the mobile station UE is stored, then the connection re-establishment process is simplified, but the adaptability of the system is reduced when the target radio base station does not store context information
Solution Approach 1:
The target radio base station eNB performs preliminary action by proactively acquiring context information from the source radio base station eNB before completing the connection re-establishment process. This is achieved through the determination unit that checks for stored context information and the acquiring unit that retrieves necessary context from the source eNB, enabling the target eNB to prepare all required information in advance before final connection establishment with the mobile station UE.
2Quantity of substance
If the radio base station eNB#2 does not store the context information of the mobile station UE, then the storage requirement is reduced, but the connection re-establishment is denied
Solution Approach 1:
The source radio base station eNB#1 acts as an intermediary that provides context information to the target radio base station eNB#2. When the target eNB determines that it does not store context information for the mobile station UE, it uses the acquiring unit to obtain the necessary context from the source eNB through the X2 interface, enabling successful connection re-establishment without requiring the target eNB to permanently store all context information.
3Adaptability or versatility
If the mobile station UE performs cell selection and attempts connection re-establishment at a radio base station without stored context information, then the system flexibility is improved, but the connection establishment fails
Solution Approach 1:
The target radio base station eNB performs preliminary action by proactively acquiring context information from the source radio base station eNB before completing the connection re-establishment process. This ensures that when the mobile station UE attempts connection re-establishment at a cell without pre-stored context, the target eNB already has the necessary information to complete the connection successfully.
Data Source
AI summary
A mobile communication method involving performing, at a mobile station UE which establishes a first connection in a first cell, a cell selection process at the time of detecting a failure in the first connection, transmitting, from the mobile station UE to a second cell selected in the cell selection process, a connection re-establishment request signal, determining, at a radio base station that manages the second cell, whether or not to store context information of the mobile station UE in response to the connection re-establishment request signal, acquiring, at the radio base station, the context information of the mobile station UE from a radio base station that manages the first cell, when determining that the context information of the mobile station UE is not stored, and establishing a second connection in the second cell for the mobile station UE, based on the context information of the mobile station UE.