MME Paging Cancellation During Mobility
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Solution Overview
Problem
In 3GPP LTE networks, the current tracking area update (TAU) procedure often results in delayed call reception and increased call failure rates due to ineffective paging mechanisms, especially when user equipment (UE) moves between eNodeB coverage areas, leading to failed paging signals and unnecessary resource wastage.
Innovation Solution
The proposed solution involves the target MME recognizing the UE's movement through the TAU procedure, allowing it to directly trigger or request the setup of a user plane bearer, and inform the S-GW to cancel previous paging attempts, thereby reducing call reception delay and resource wastage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the current TAU procedure is used, then the network can handle UE mobility, but paging signals are delivered late or failed and downlink data is lost
Solution Approach 1:
The source MME proactively cancels paging at the S-GW before the UE completes handover to the target eNodeB. By anticipating the paging failure risk during mobility and pre-canceling the paging indication, the system prevents data loss and reduces delays without waiting for actual paging failure confirmation.
2Productivity
If paging is transmitted during UE mobility, then call reception can be attempted, but network resources are wasted due to failed paging signals
Solution Approach 1:
The system uses feedback from the TAU procedure to determine paging cancellation. When the source MME receives a TAU request indicating the UE is moving to a different tracking area, it uses this feedback information to cancel pending paging operations, thereby avoiding wasted network resources on futile paging transmissions.
3Reliability
If the S-GW buffers downlink data during paging, then data can be delivered later, but data is lost when paging fails and UE moves
Solution Approach 1:
The source MME takes preliminary anti-action by canceling paging at the S-GW before data transmission failures occur. By proactively removing the paging indication during the TAU procedure, the system prevents the scenario where data would be buffered indefinitely or lost due to UE mobility, thereby improving both reliability and reducing eventual delivery delays.
Data Source
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AI summary
The present invention provides a method for processing paging from a server managing mobility in a mobile communication network. The method comprises: receiving from a network node a notification with respect to downlink data to be relayed to user equipment; transmitting a paging signal with respect to the user equipment to one or more base stations; receiving a context request with respect to the user equipment from a different server; recognizing that the paging will fail if the context request with respect to the terminal is received before receiving a reply to the paging; relaying a context reply to the different server depending on the recognition; and transmitting a processing request message with respect to the downlink data to the network node.