Serving Gateway Paging Control for Wireless Signaling Reduction
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently managing Idle-mode Signaling Reduction (ISR) activation/deactivation, especially when Extended Idle mode Discontinuous Reception (eDRX) is supported, leading to unnecessary resource waste due to mismatched eDRX capabilities between network nodes.
Innovation Solution
A method is introduced where a Serving Gateway (S-GW) transmits Downlink Data Notification (DDN) messages to both network nodes and sends a Stop Paging Indication message when a DDN Reject is received, utilizing a timer to manage eDRX mode activation/deactivation based on proper Non-Access Stratum (NAS) signaling, ensuring controlled paging and resource optimization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the S-GW transmits DDN messages to both network nodes (MME and SGSN) when ISR is activated, then downlink data delivery coverage is improved, but unnecessary paging messages are transmitted causing resource waste when eDRX is involved
Solution Approach 1:
The S-GW receives feedback in the form of DDN Reject messages from network nodes indicating eDRX capability. Based on this feedback, the S-GW adjusts its paging behavior by transmitting Stop Paging Indication messages to prevent unnecessary paging, thus resolving the contradiction between maintaining delivery coverage and avoiding resource waste.
Solution Approach 2:
The S-GW performs preliminary actions by checking eDRX capability status before transmitting paging messages. When a DDN Reject message indicating eDRX is received, the S-GW proactively sends Stop Paging Indication to prevent subsequent unnecessary paging transmissions, thereby avoiding resource waste while maintaining data delivery reliability.
2Productivity
If paging is transmitted to UEs in eDRX mode without proper coordination, then data delivery attempts are made, but mismatched eDRX capabilities between network nodes cause signaling overhead and resource waste
Solution Approach 1:
The S-GW acts as an intermediary that coordinates between network nodes with different eDRX capabilities. It receives DDN Reject messages from nodes lacking eDRX support and manages the paging process accordingly, sending Stop Paging Indication to prevent coordination conflicts and reduce signaling overhead.
Solution Approach 2:
The system changes the paging parameter state based on eDRX capability detection. When eDRX capability is detected through DDN Reject messages, the S-GW changes the paging behavior by issuing Stop Paging Indication, thereby adapting the signaling process to match the actual capabilities of network nodes and reducing unnecessary complexity.
3Reliability
If the S-GW continues paging without receiving Stop Paging Indication, then data delivery is attempted, but unnecessary paging messages increase network load and energy consumption
Solution Approach 1:
The S-GW implements feedback-based paging control by monitoring for DDN Reject messages and corresponding Stop Paging Indication messages. This feedback mechanism allows the S-GW to stop transmitting paging messages when eDRX capability is detected, thereby reducing energy consumption while maintaining data delivery assurance through coordinated network node operation.
Data Source
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AI summary
It is disclosed a method and apparatus for controlling Idle-mode Signaling Reduction of a user equipment in a wireless communication system. Particularly, a method for controlling paging of a user equipment (UE) in which Idle-mode Signaling Reduction (ISR) is activated performed by a Serving Gateway (S-GW) in a wireless communication system may include transmitting a Downlink Data Notification (DDN) message to both of a first network node and a second network node, when receiving downlink data from a Packet Data Network Gateway (P-GW); and, when receiving a DDN Reject message from either one network node of the first network node and the second network node in response to the DDN message, transmitting a Stop Paging Indication message to a remaining network node.