LTE Paging Control via Dynamic S1 Connection Management
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Solution Overview
Problem
In LTE systems, when a user equipment (UE) transitions between RRC idle and connected states, existing methods that hold the UE context to reduce signaling fail to ensure proper call incoming if the UE moves to a different base station area, as there is no mechanism to perform paging effectively while maintaining S1-C/U connections.
Innovation Solution
A paging control method where the base station transmits a connection maintaining instruction signal to the communication control apparatus, allowing it to hold downlink data in a buffer and transmit a paging signal to the UE while maintaining the connection, and if no response is detected, requests the communication control apparatus to retransmit the paging signal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If the eNB continues to hold the UE context when the UE enters RRC idle state, then signaling can be reduced, but the UE cannot receive incoming calls if it moves to another eNB area
Solution Approach 1:
The patent implements dynamic connection management where the S1-C/U connection state can transition between connected and released based on UE mobility status. When UE moves to a new eNB, the connection is released and re-established, ensuring call incoming reliability while minimizing signaling overhead by maintaining connections only when beneficial.
Solution Approach 2:
The patent changes the connection state parameter dynamically - transitioning from a static 'always hold' approach to a dynamic 'hold or release based on conditions' approach. This allows the system to adapt connection maintenance to specific scenarios, reducing signaling overhead when UE is stationary while ensuring reliability when UE moves.
2Loss of substance
If the S1-C/U connection is maintained in the core network, then signaling can be reduced, but paging cannot be performed effectively when UE moves to a different eNB
Solution Approach 1:
The patent implements dynamic connection release and re-establishment based on UE location changes. When UE moves to a new eNB, the S1-C/U connection is released and re-established with the new eNB, enabling effective paging while minimizing unnecessary connection maintenance that would increase signaling overhead.
Solution Approach 2:
The patent uses the MME as an intermediary to manage the S1-C/U connection state. The MME coordinates connection release and re-establishment procedures, enabling seamless transition between eNBs while maintaining efficient signaling management and ensuring paging functionality is preserved.
3Reliability
If conventional paging methods are used after UE context release, then call incoming can be performed, but the number of signalings increases
Solution Approach 1:
The patent dynamically selects between two approaches: maintaining S1-C/U connection to reduce signaling (when UE is stationary) or releasing and using conventional paging (when UE moves). This dynamic selection optimizes the balance between signaling overhead and call incoming reliability based on actual UE behavior.
Solution Approach 2:
The patent changes the connection state parameter based on detected UE mobility patterns. When UE moves to a new eNB, the system transitions from connection maintenance mode to conventional paging mode, adjusting signaling overhead while preserving call incoming functionality.
Data Source
AI summary
A paging control method in a mobile communication system including a base station and a communication control apparatus, including: an instruction step in which, in a state where a connection between the base station and the communication control apparatus is established, the base station transmits a connection maintaining instruction signal to the communication control apparatus; and a paging step in which, when the communication control apparatus that receives the connection maintaining instruction signal receives downlink data for the user apparatus, the communication control apparatus holds the downlink data in a buffer and transmits a paging signal for the user apparatus while maintaining the connection between the base station and the communication control apparatus.