Priority Call Bearer Management in Mobile Networks
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Solution Overview
Problem
In mobile communication systems, priority calls are not effectively prioritized for resource allocation, leading to failed or disconnected IMS call control signal bearers due to congestion, as existing systems fail to distinguish and manage priority calls differently from normal calls during paging and resource allocation processes.
Innovation Solution
A method involving a call control node that notifies a priority control node of priority calls, allowing the priority control node to change the priority of call control signal bearers to higher levels and perform preferential paging, ensuring that IMS call control signal bearers for priority calls are established and maintained before those for normal calls.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the IMS performs paging for priority calls using existing procedures, then the paging can be initiated, but the priority call cannot be paged more preferentially than normal calls, leading to resource allocation failures
Solution Approach 1:
The patent changes the parameter of call handling priority by introducing a priority indication in the Downlink Data Notification message. This parameter change enables the network to distinguish priority calls from normal calls and apply different handling procedures, thereby achieving preferential paging and resource allocation for priority calls while maintaining system productivity.
2Reliability
If resources are allocated to IMS call control signal bearers without priority differentiation, then normal call processing is maintained, but priority calls fail to establish or maintain bearers during congestion
Solution Approach 1:
The patent introduces a priority indication field as an intermediary element in the Downlink Data Notification message. This intermediary carries priority information from the call control node to the mobility management node, enabling indirect priority-based resource allocation without fundamentally redesigning the existing bearer establishment mechanism, thus maintaining reliability while controlling complexity.
Solution Approach 2:
The patent implements dynamic resource allocation by allowing the mobility management node to adjust bearer allocation based on real-time priority information. When congestion is detected and priority calls are identified through the priority indication, the system dynamically shifts resource allocation to ensure priority call bearer maintenance, adapting to changing network conditions without fixed rigid rules.
3Reliability
If the network treats all calls uniformly during congestion, then system simplicity is maintained, but priority calls experience the same resource allocation failures as normal calls
Solution Approach 1:
The patent applies local quality differentiation by treating priority calls differently at specific points in the call flow where the priority indication is present. The mobility management node applies preferential handling only to bearers marked with priority indications, while normal bearers continue to follow standard procedures. This localized differentiation improves priority call service quality without requiring complete system redesign, thereby maintaining overall productivity.
Data Source
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AI summary
The present invention provides the steps of: at a priority control node (PCRF), when reception of an invite signal including priority call information is notified from a call control node (P-CSCF), determining whether it is required to change the ARP of a call control signal bearer for sending the invite signal from a gateway (P-GW) to a mobile terminal (UE) to a higher ARP than the priority set in the call control signal bearer; when change of the ARP is determined to be required, changing the ARP of the call control signal bearer to a higher ARP than the ARP set in the call control signal bearer; and performing a paging for the mobile terminal (UE) according to the priority of the call control signal bearer.