Session Context Preservation in Wireless Registration
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Solution Overview
Problem
In wireless communication systems, events such as OS updates, modem resets, or network-initiated deregistration requests can cause the deletion of both mobility management and session management contexts in a WTRU, leading to inefficiencies.
Innovation Solution
The method involves a WTRU sending a registration request to a network node, indicating its capability to preserve context information during unavailability. The network responds with a registration accept message supporting context preservation. The WTRU then requests to preserve context information before becoming unavailable, and after regaining availability, it notifies the network, allowing for the recovery of session management context.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If mobility management context is deleted during events such as OS updates or modem resets, then the WTRU can perform necessary system updates, but session management context is also deleted causing inefficiencies
Solution Approach 1:
The patent segments the management contexts into two independent parts: mobility management context and session management context. By separating these contexts, the system can delete only the mobility management context during events like OS updates while preserving the session management context, thus avoiding unnecessary loss of session information.
Solution Approach 2:
The patent extracts the session management context from the mobility management context deletion process. When a mobility management context deletion event occurs, the system specifically targets and deletes only the mobility management context while leaving the session management context intact, effectively extracting the beneficial session information from the harmful deletion process.
2Productivity
If session management context is preserved during mobility management context deletion, then network efficiency is improved, but additional signaling messages are required
Solution Approach 1:
The patent merges the context preservation indication with existing registration request messages. The WTRU includes an indication in the registration request message that it supports context preservation, and the network responds with a registration accept message confirming support. This merging approach adds minimal signaling overhead while achieving context preservation.
Solution Approach 2:
The system uses self-service mechanisms where the WTRU autonomously indicates its capability to preserve context in the registration request, and the network autonomously responds with capability confirmation. This self-service approach reduces the need for complex external control mechanisms while maintaining efficiency.
Data Source
AI summary
A wireless transmit/receive unit (WTRU) may send to a network node a registration request message requesting to register with the network and indicating that the WTRU is capable of preserving, when the WTRU becomes unavailable to the network, context information associated with the communications between the WTRU and the network. The network node may indicate in a registration accept message that the network supports the preservation of context information when the WTRU becomes unavailable to the network. Based on a determination that the WTRU will become unavailable to the network, the WTRU may send to the network a message indicating a request to preserve the context information. The message may comprise an indication of a time period during which the WTRU will be unavailable.