LIPA Connection Release for UE Mobility in Mixed HeNB Networks
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Solution Overview
Problem
Conventional Local IP Access (LIPA) networks do not support mobility of User Equipment (UE) when both Release 11 (Rel-11) and Pre-Release 11 (PRE Rel-11) Home eNodeB (HeNB) coexist, as the PRE Rel-11 HeNB cannot establish a connection with a stand-alone Local Gateway (L-GW), preventing seamless UE mobility between HeNBs.
Innovation Solution
A method and apparatus for managing LIPA connections in UE, involving handover decisions at the source home base station to determine if the target HeNB is a Rel-11 or PRE Rel-11 HeNB, and releasing the LIPA connection if it is a PRE Rel-11 HeNB or part of a different local network, using Tracking Area Updates (TAU) and Mobility Management Entity (MME) to verify L-GW addresses and IDs for mobility management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If H(e)NB and L-GW are logically separated to support mobility, then mobility capability is improved, but connection establishment fails when PRE Rel-11 H(e)NB coexists
Solution Approach 1:
The system dynamically adapts its behavior based on the capability of the target H(e)NB. During handover, the source H(e)NB determines whether the target supports Rel-11 mobility features, and accordingly decides whether to maintain or release the LIPA connection. This dynamic adaptation allows the system to support mobility when Rel-11 H(e)NBs are involved while ensuring reliable connection establishment when PRE Rel-11 H(e)NBs are present.
Solution Approach 2:
The source H(e)NB performs preliminary assessment of the target H(e)NB's capability before executing handover. By checking whether the target H(e)NB is a Rel-11 or PRE Rel-11 base station in advance, the system can proactively prepare the appropriate action (maintain or release LIPA connection), preventing connection establishment failures before they occur.
2Reliability
If LIPA connection is maintained during handover, then service continuity is improved, but it causes harmful effects when target H(e)NB cannot establish connection with L-GW
Solution Approach 1:
The system uses feedback from the handover decision process to control LIPA connection maintenance. The source H(e)NB receives information about the target H(e)NB's capability and uses this feedback to determine whether to maintain or release the LIPA connection. This feedback mechanism ensures that LIPA connections are only maintained when the target H(e)NB can successfully establish connection with the L-GW, preventing connection failures while preserving service continuity when possible.
3Measurement precision
If handover decision includes target H(e)NB type verification, then mobility management accuracy is improved, but processing complexity increases
Solution Approach 1:
The system extracts only the essential capability information (Rel-11 or PRE Rel-11 type) from the target H(e)NB during handover verification. By focusing on this specific, critical attribute rather than analyzing all possible parameters, the system achieves accurate mobility management decisions while minimizing processing complexity. This selective extraction of key information balances precision with efficiency.
Data Source
AI summary
The present invention relates to a method and apparatus for managing a Local IP Access (LIP A) connection in a local network system. The method of managing a LIP A connection of UE in a connected state according to an embodiment of the present invention includes the steps of a source home base station for UE determining a handover of the UE; when the handover of the UE is determined, determining whether a target home base station is a Long Term Evolution (LTE) release 10 or a Pre Rel-11 HeNB; and when the target home base station is a Pre Rel-11 HeNB, disconnecting the LIP A connection of the UE. According to an embodiment of the present invention, the mobility of UE having a LIPA PDN connection can be efficiently controlled in a local network where a Rel-11 H(e)NB and a Pre Rel-11 H(e)NB exist together.