Base Station Context Retention for Mobile Signaling
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Solution Overview
Problem
In mobile communication systems, particularly in LTE, there is a significant amount of signaling overhead when a user apparatus (UE) transitions between RRC idle and connected states, as existing technologies retain large amounts of context information, leading to increased memory requirements and costs for base stations.
Innovation Solution
A base station is configured with a deletion unit to remove predetermined information when the UE enters an idle state and an acquisition unit to retrieve this information from a communication control device when the UE resumes a connected state, reducing the size of context information retained and optimizing signaling processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the base station retains large amounts of context information when the UE transitions to idle state, then the connection can be quickly re-established when the UE returns, but the memory requirements and costs for the base station increase
Solution Approach 1:
The patent segments context information into two parts: essential information retained by the base station (eNB) and non-essential information stored by the communication control device (MME). When the UE transitions to idle state, the base station releases non-essential context information while keeping essential information, enabling connection re-establishment without requiring the base station to retain all original context data.
Solution Approach 2:
The patent introduces the communication control device (MME) as an intermediary that stores context information released by the base station. When the UE needs to re-establish connection, the MME acts as a mediator to provide the necessary context information back to the base station, enabling connection recovery without the base station needing to retain all context information continuously.
2Loss of time
If the base station retains all context information in idle state, then no information needs to be re-acquired upon connection resumption, but the signaling overhead and processing complexity increase
Solution Approach 1:
The patent extracts non-essential context information from the base station's memory and transfers it to the communication control device. This extraction allows the base station to maintain only essential context information during idle state, reducing memory usage and simplifying signaling processing while enabling efficient re-acquisition of extracted information through standardized interfaces when needed.
Data Source
AI summary
A base station in a mobile communication system that supports a function to reuse context information retained in each of a user apparatus and the base station to establish a connection is disclosed including a deletion unit configured to delete predetermined information in the context information associated with the user apparatus when the user apparatus ends a connected state in a condition where the base station retains the context information associated with the user apparatus, and an acquisition unit configured to acquire the predetermined information from a communication control apparatus that retains the predetermined information in the mobile communication system when the user apparatus restarts the connected state.