Maintaining Multiple PDN Connections During Idle Mode Handover
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Solution Overview
Problem
Existing methods and systems fail to optimize handover procedures for user equipment from a 3GPP EUTRAN network to a non-3GPP HRPD cdma2000 system while maintaining connectivity with multiple PDN networks, especially in idle mode.
Innovation Solution
The system involves the user equipment providing an indication to the non-3GPP access node, which then contacts the home network's HSS or AAA entity to obtain addresses of multiple PDN gateways currently in use, enabling the access node to maintain multiple PDN connectivity during an idle mode handover.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the user equipment performs idle mode handover from 3GPP EUTRAN to non-3GPP HRPD cdma2000 system using prior art methods, then the handover procedure is simplified, but the connectivity with multiple PDN networks is lost
Solution Approach 1:
The source access node pre-processes and determines the target access node address before the handover occurs. This preliminary action ensures that the target access node can be immediately identified and contacted, enabling seamless maintenance of multiple PDN connections during the idle mode handover without requiring complex real-time negotiations.
2Reliability
If the system maintains multiple PDN connections during idle mode handover by contacting HSS/AAA entities, then the PDN network connectivity is preserved, but the system complexity increases
Solution Approach 1:
The source access node acts as an intermediary that consolidates the handover signaling and coordinates with the target access node and core network entities. This intermediary role simplifies the overall system complexity by centralizing the control functions rather than requiring direct interactions between multiple nodes and entities.
Solution Approach 2:
The patent extracts the handover control logic from the user equipment and places it in the network infrastructure (source and target access nodes). This extraction reduces the complexity burden on the user equipment while maintaining the necessary functionality for preserving multiple PDN connections during handover.
3Reliability
If the user equipment provides indication to the access node for multiple PDN connectivity, then the multiple PDN connections are maintained, but the signaling overhead increases
Solution Approach 1:
The patent merges the handover signaling with the existing indication mechanisms already present in the system. By combining multiple functions (handover notification and multiple PDN connection maintenance request) into a single signaling exchange, the overhead is minimized while still achieving the desired outcome of maintaining multiple PDN connections.
Data Source
AI summary
Supporting an optimized idle mode handoff of user equipment from a 3GPP to a non-3GPP system. Namely, during an idle mode registration of the user equipment with the non-3GPP system, the user equipment may provide an indication to the access node on the non-3GPP system so that the access point in that non-3GPP system contacts the appropriate entity (HSS or AAA) on the home network for the user equipment to download the addresses of the multiple PDN gateway addresses that are currently in use by the user equipment. This indication to the non-3GPP access node, the contact message from the access node to the home network, and the response from the home network to the access node on the non-3GPP system provide the access node with sufficient information to maintain multiple PDN connectivity to the user equipment during an idle mode handover.