Dual Bearer QoS Segmentation for VoLTE Signaling
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Solution Overview
Problem
In wireless communication systems, ensuring sufficient quality of service for high priority services like VoLTE and video over LTE is challenging due to overloading from lower priority IMS signaling, which leads to increased latency and jitter, affecting the performance of critical traffic.
Innovation Solution
Implementing a dual bearer system where high priority services like VoLTE and SMS over IP use a first bearer with QCI value 5 for critical signaling and lower priority services like SIP presence and instant messaging use a second bearer with QCI values 6-9, thereby separating QoS requirements and reducing latency for high priority traffic.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single bearer is used for all IMS signaling traffic, then device complexity is reduced, but quality of service for high priority services deteriorates due to overloading from lower priority traffic
Solution Approach 1:
The patent segments IMS signaling traffic into multiple bearers based on priority levels. High priority signaling (e.g., session setup, SMS over IP) is separated from low priority signaling (e.g., SIP presence, instant messaging) by assigning them to different bearers with appropriate QoS parameters. This segmentation prevents low priority traffic from degrading the quality of service for critical services.
2Reliability
If all IMS signaling messages are transmitted with high priority, then reliability of critical services is maintained, but loss of time increases due to unnecessary resource allocation for non-critical messages
Solution Approach 1:
The patent applies local quality by assigning different QoS characteristics to different portions of IMS signaling traffic based on their specific requirements. Critical signaling messages receive high priority treatment with guaranteed resources, while non-critical messages are transmitted with lower priority. This localized differentiation optimizes resource allocation and reduces latency for time-sensitive operations.
Data Source
AI summary
Quality of service may be enhanced for high priority traffic. A UE may communicate within a packet switched system, e.g., an LTE network. The UE may use a first or default bearer for signaling messages of high priority services and a second bearer for messages of low priority services. For example, the first bearer may have a quality of service class identifier (QCI) value of 5 while the second bearer may have a QCI value other than 5, (e.g., 6-9). The first bearer may be used for signaling messages associated with voice over IP, video over IP, and/or SMS over IP, as desired. The second bearer may be used for messages (e.g., signaling messages) associated with other, lower priority services. For example, the second bearer may be used for presence messages or instant messages or other lower priority messages.