Emergency Context Preservation in Wireless Communication Devices
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Solution Overview
Problem
In wireless communication systems, emergency sessions face delays and unnecessary signaling due to redundant deactivation and activation of emergency contexts, especially when radio resources are not available, and during abnormal scenarios like network-initiated detach procedures, leading to critical delays in emergency service access.
Innovation Solution
The method involves preserving the emergency context when radio resources are not allocated and continuing service requests even if detach requests are received, ensuring that emergency sessions are not aborted during Routing Area Updates or detach procedures, thus avoiding redundant deactivation and activation steps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the network does not allocate radio resources to the emergency context, then the emergency session establishment is delayed due to redundant deactivation and activation procedures, but preserving the emergency context without radio resources wastes network resources
Solution Approach 1:
The network performs preliminary actions by pre-allocating radio resources for emergency contexts before they are actually needed. When an emergency session is initiated, the resources are already in place, eliminating the need for redundant deactivation and activation procedures. This principle resolves the contradiction by preparing the system in advance, so that when emergency services are required, immediate access is possible without wasting network resources during normal operation.
2Reliability
If the UE aborts the service request procedure upon receiving a detach request message, then the detach procedure can be completed, but the emergency session establishment is delayed
Solution Approach 1:
The procedure is segmented into separate handling paths for different message types. When a detach request message is received during service request procedure, the system identifies the message type and routes it appropriately - either completing the detach procedure or continuing the service request procedure for emergency sessions. This segmentation allows both detach operations and emergency session establishment to proceed without unnecessary delays, resolving the contradiction between reliable detach completion and timely emergency access.
3Reliability
If the UE performs a combined tracking area update procedure to reattach for CS services, then the detach procedure is completed, but the emergency call activation is aborted
Solution Approach 1:
The system dynamically adjusts its behavior based on the type of service request and the current state. When handling emergency sessions, the UE dynamically decides to continue the service request procedure even after receiving a detach request message, rather than following the standard abort-and-reattach sequence. This dynamic adaptation allows emergency services to be accessed immediately without waiting for reattachment procedures, resolving the contradiction between reliable detach completion and fast emergency service access.
Data Source
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AI summary
A method for handling an emergency session for a network in a wireless communication system is disclosed. The method comprises having an emergency context for a mobile device corresponding to the emergency session; not deactivating the emergency context for the mobile device when the network does not allocate radio resources to the emergency context; and preserving the emergency context.