Common PDP Context for IMS Session Bearer Sharing
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Solution Overview
Problem
Current GPRS/UMTS networks face limitations in establishing flexible communications bearers, particularly in supporting multiple IMS sessions over a single bearer, which hinders efficient resource utilization and end-to-end quality of service.
Innovation Solution
A telecommunications system that includes an internet protocol multimedia subsystem with a call state control function and a home subscriber server, enabling the generation of an authorization token for mobile user equipment to use either a common or dedicated communications bearer, allowing for the sharing of packet data protocol contexts across different internet protocol versions, such as IPv4 and IPv6, and supporting hierarchical authorizations for single or multiple IMS sessions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If each mobile user equipment uses its own specific PDP context for data communication, then communication reliability is ensured, but network resource utilization efficiency deteriorates
Solution Approach 1:
The patent segments the PDP context into two parts: a common PDP context shared by multiple UE and a dedicated PDP context for specific UE. This segmentation allows multiple UEs to share common resources while maintaining dedicated contexts for specific communication needs, resolving the contradiction between resource sharing and communication reliability.
Solution Approach 2:
The common PDP context serves multiple functions by supporting multiple UEs and multiple IP versions (IPv4 and IPv6) simultaneously. This multi-functionality enables a single PDP context to provide communication services to different users and protocols, improving network resource utilization while maintaining reliability through proper access control.
2Productivity
If a common PDP context is established for multiple IP versions, then resource utilization is improved, but session management complexity increases
Solution Approach 1:
The patent introduces a packet filter as an intermediary mechanism to distinguish between different UEs and IP versions within the common PDP context. The packet filter acts as a mediator that routes packets to the appropriate UE or dedicated context, simplifying the management of multiple sessions without requiring complex centralized control.
Solution Approach 2:
While maintaining a common PDP context with uniform resource allocation, the patent applies local quality differentiation through packet filters that target specific UEs or IP versions. This allows the system to maintain simplicity at the common context level while providing targeted management for specific sessions where needed.
3Reliability
If multiple IMS sessions are multiplexed on a single bearer, then end-to-end quality of service is improved, but bearer configuration flexibility deteriorates
Solution Approach 1:
The patent implements dynamic bearer configuration where the network can flexibly allocate dedicated bearers to specific UEs or IP versions within the common PDP context. This dynamic capability allows the system to adapt bearer configurations to specific QoS requirements while maintaining the overall flexibility of resource sharing.
Data Source
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AI summary
A telecommunications system provides an internet protocol multimedia communications session to a mobile user equipment. The system comprises an internet protocol multimedia subsystem including a call state control function operable to control the multimedia communications sessions, and a home subscriber server operable to provide information associated with the mobile user equipment for providing the communications session. A packet radio network is operable to provide a mobile communications facility to the mobile user equipment to support the multimedia communications session. The call state control function is operable in response to a request message from the mobile user equipment for the communications session to be established, to generate an authorisation token for the mobile user equipment in accordance with subscriber information representing a service to which the mobile user equipment has subscribed. The request from the mobile user equipment identifies that the communications session requested is for one of a group communications session sharing a communications resource, or a single communications session for which a communications resource is dedicated to the mobile user equipment. The authorisation token generated by the serving call state control function for communication to the mobile user equipment provides an indication that the mobile user equipment can use correspondingly one of a common communications bearer or a dedicated communications bearer via which the communications session can be supported. As such a plurality of mobile user equipment can request and receive a group multi-media communications session authorised through a token based authorisation procedure. The packet radio network can then allocate a group multi-media communications session, which shares a common packet communications bearer.