QoS Borrowing in IMS Communication Sessions
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Solution Overview
Problem
Existing telecommunications systems, particularly those using IP Connectivity Access Networks, face challenges in maintaining adequate Quality of Service (QoS) during communication sessions due to subscription limitations, which can lead to service degradation or session abortion, especially in cases where one user's QoS is insufficient for a particular service requirement.
Innovation Solution
A method is introduced where a first user can request and provide additional Quality of Service (QoS) from their subscription to a second user, allowing the second user to meet the required QoS for a communication session, either by temporarily borrowing QoS or upgrading their subscription, ensuring both users have sufficient QoS for the session.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a user's subscription QoS is strictly enforced, then network resource management is maintained, but communication sessions cannot be established when QoS is insufficient
Solution Approach 1:
The patent implements dynamic QoS adjustment by allowing temporary modifications to subscription-based QoS parameters during communication sessions. The system dynamically evaluates session requirements against available network resources and user subscriptions, then temporarily adjusts QoS parameters (such as bandwidth, priority, or resource allocation) to enable session establishment while maintaining overall network control and resource management.
2Reliability
If additional QoS is provided to meet session requirements, then service quality is improved, but network resource consumption increases
Solution Approach 1:
The patent changes QoS parameters dynamically based on session requirements and network conditions. Instead of providing fixed additional QoS, the system adjusts parameters such as bandwidth allocation, priority levels, and resource reservation temporarily during the session duration, then reverts to original subscription-based parameters when the session ends, thereby optimizing resource utilization while maintaining service quality.
3Reliability
If QoS is temporarily increased for a session, then user experience is maintained, but subscription limits are exceeded
Solution Approach 1:
The patent performs preliminary evaluation of QoS requirements before session establishment by comparing session demands with user subscription limits and available network resources. This preliminary assessment allows the system to determine whether temporary QoS adjustments are feasible and acceptable, ensuring that subscription limits are not permanently exceeded while still enabling sessions that meet user experience requirements through controlled temporary adjustments.
Data Source
AI summary
A method for operating an IP Multimedia Subsystem Application Server to facilitate a communication session between a first user and a second user at a required Quality of Service (QoS) is provided. The method calls for receiving a notification that a Policy and Charging Rules function (PCRF) associated with the first user has not authorized the required QoS. The notification includes an indication of additional QoS required by the first user in order to achieve the required QoS. Authorization for the additional QoS for the first user is then requested from a PCRF associated with the second user. The method then calls for receiving a notification that the PCRF associated with the second user has authorized the additional QoS, and notifying the PCRF associated with the first user that the additional QoS has been authorized for the first user.