Home Cell Radio Access Node LIPA Connection Deactivation
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Solution Overview
Problem
Existing solutions fail to effectively release Local IP Access (LIPA) PDN connections during handovers from one home cell to another, as the Serving Gateway Support Node (SGSN) or Mobility Management Entity (MME) may not be aware of the handover, leading to inappropriate timing and incomplete deactivation of LIPA connections.
Innovation Solution
A home cell radio access node detects handover conditions and triggers the local data gateway to deactivate LIPA PDN connections, allowing the home NodeB to manage the release of these connections independently, ensuring timely and complete deactivation before initiating a handover.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the SGSN or MME triggers the deactivation of LIPA PDN connection, then the connection can be deactivated, but the SGSN or MME must be involved in the handover signaling which increases network complexity and may not be timely
Solution Approach 1:
The patent extracts the LIPA connection deactivation function from the core network (SGSN/MME) and relocates it to the HeNB. The HeNB independently detects handover conditions and triggers LIPA connection deactivation locally, eliminating the need for core network involvement in handover signaling while ensuring reliable deactivation.
Solution Approach 2:
The HeNB performs self-service by autonomously detecting handover conditions and managing LIPA connection deactivation without requiring external triggering from the SGSN or MME. This self-service approach reduces network signaling complexity while maintaining deactivation reliability.
2Reliability
If the SGSN or MME deactivates the LIPA connection during or after handover, then the connection is deactivated, but the timing is inappropriate as LIPA resources are not allowed at target side
Solution Approach 1:
The patent applies preliminary action by having the HeNB detect handover conditions and trigger LIPA connection deactivation before the handover is executed. This ensures the connection is deactivated in advance, avoiding the timing issue where deactivation occurs during or after handover when LIPA resources are no longer available at the target side.
3Reliability
If the handover signaling goes via the SGSN or MME, then the core network can trigger deactivation, but this increases the number of hops and network stress
Solution Approach 1:
The patent extracts the handover detection and LIPA deactivation functions from the core network signaling path and implements them locally at the HeNB. This eliminates unnecessary hops through the SGSN or MME for handover-related LIPA deactivation, reducing network traffic load and energy consumption while maintaining reliability for other critical signaling.
Data Source
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AI summary
The present invention relates to a home arrangement (7). In accordance with an embodiment of the invention, the home arrangement comprises: - a radio access node (2) configured to operate a home cell (A), with detecting means for detecting a handover condition for a particular mobile device (1), and - a local 1 data gateway (3) supporting at least one alive data bearer connection for connection of the particular mobile device to a local data network (11). wherein the local data gateway comprises releasing means for triggering the de-activation of the at least one alive data bearer connection upon detection of said handover condition. The present invention also relates to a method for releasing network resources.