LIPA Connection Release During UE Mobility
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current systems face challenges in managing Local IP Access (LIPA) connection releases during user equipment mobility, leading to unwanted UE disconnections and service disruptions due to the lack of service continuity when moving out of residential/enterprise network coverage.
Innovation Solution
The proposed solution involves configuring user equipment (UE) to store context information about LIPA connections and implementing specific procedures for PDN connection management, such as implicit or explicit deactivation of LIPA connections during handovers, and rejecting handover requests when LIPA continuity is not supported, to ensure seamless mobility and maintain network attachment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If LIPA connection is released when UE moves out of residential/enterprise network coverage, then network resource management is improved, but service continuity deteriorates causing unwanted UE disconnections
Solution Approach 1:
The network side performs preliminary actions by sending notification messages to the UE before releasing the LIPA connection, informing the UE of the upcoming connection release due to moving out of coverage. This allows the UE to prepare for the connection release and maintain service continuity by establishing alternative connections beforehand.
Solution Approach 2:
The patent introduces an intermediary notification mechanism between the network side and UE. The network side acts as an intermediary that communicates the coverage status and connection release information to the UE, enabling coordinated connection management that maintains service continuity while properly releasing resources.
2Productivity
If LIPA connection is maintained during mobility, then service continuity is improved, but network resource management deteriorates due to unwanted disconnections
Solution Approach 1:
The patent implements a feedback mechanism where the network side continuously monitors UE mobility status and provides feedback through notification messages. When the UE moves out of residential/enterprise network coverage, the network side sends a notification to the UE, and based on this feedback, the LIPA connection is appropriately released to maintain connection stability.
Solution Approach 2:
The LIPA connection management is made dynamic by allowing the connection state to change based on UE mobility status. The connection is maintained when UE is in coverage and dynamically released when UE moves out of coverage, optimizing both mobility efficiency and connection stability.
3Reliability
If handover requests are rejected when LIPA continuity is not supported, then connection stability is improved, but mobility efficiency deteriorates
Solution Approach 1:
The patent extracts the LIPA connection release function from the handover process. Instead of rejecting handover requests, the handover is allowed to proceed, and the LIPA connection is separately released based on coverage status. This separates the handover function from the LIPA connection management, improving both connection stability and handover efficiency.
Data Source
AI summary
In some examples, a user equipment (UE) obtains a connectivity in a first cell, the connectivity comprising a first type of connection that provides access to services in a local data network. The UE camps on a second cell, determines if the connectivity is not supported in the second cell based on broadcast information from the second cell, the broadcast information comprising information of the second cell, and in response to determining that the connectivity is not supported in the second cell, disconnect the connectivity, wherein the disconnecting comprises sending a Non Access Stratum (NAS) message via the second cell.