IMS Serving Session Control Node Selection via Dynamic Capability Mapping
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The current selection process for a serving session control node in an IP Multimedia Subsystem (IMS) telecommunication network lacks flexibility, as it is based on static information provisioned for each User Equipment (UE), without considering the actual capabilities or requirements of the UE, leading to potential mismatches between required and supported features.
Innovation Solution
The proposed method involves a UE capability feature being mapped to a server capability in a SIP register message, allowing the Home Subscriber Server (HSS) to translate this feature into a UE-initiated server capability, enabling the interrogating session control node to select a serving session control node that actually supports the required features, thereby enhancing the selection process based on dynamic conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If static provisioned server capabilities are used for S-CSCF selection, then the selection process is simple and operator-configurable, but the selection lacks flexibility and may not match actual UE capabilities
Solution Approach 1:
The patent transforms the static capability matching process into a dynamic one by introducing UE-initiated server capabilities that are determined at runtime based on actual UE capabilities and network conditions. The I-CSCF now receives dynamic capability information from the UE through the SIP REGISTER message and uses this to dynamically select the most appropriate S-CSCF, rather than relying solely on pre-provisioned static capabilities.
Solution Approach 2:
The patent changes the parameters used for S-CSCF selection by introducing new UE-initiated server capability parameters that reflect actual UE capabilities. These parameters are mapped from UE capability features and included in the authorization answer message, allowing the selection process to adapt to different UE types and capabilities without requiring complete reconfiguration of the selection mechanism.
2Measurement precision
If operator-defined capability values are used, then the selection process is standardized and manageable, but the actual UE capabilities and requirements may not be accurately reflected
Solution Approach 1:
The patent introduces the HSS as an intermediary that performs the mapping between UE capability features and UE-initiated server capabilities. This mediator translates the UE's actual capabilities into the standardized capability values that the I-CSCF can use for selection, bridging the gap between actual UE capabilities and the operator's capability framework without requiring direct operator configuration for each capability.
Solution Approach 2:
The patent enables the UE to self-report its capabilities through the SIP REGISTER message, eliminating the need for operators to manually configure and update capability information for each UE. The UE autonomously provides its capability features, which are then processed by the HSS and used by the I-CSCF for accurate S-CSCF selection.
Data Source
AI summary
Selecting a serving session control node in an Internet Protocol, IP, Multimedia Subsystem, IMS, telecommunication network, for a User Equipment. The method includes receiving, by an interrogating session control node, a Session Initiation Protocol, SIP register message for registering said UE in said IMS telecommunication network, the SIP register message has a UE capability feature mappable to a UE initiated server capability for the serving session control node, transmitting, by the interrogating session control node, to a Home Subscriber Server, a user authorization request message comprising the UE capability feature, receiving, by the interrogating session control node, from the Home Subscriber Server, a user authorization answer message including one or more UE initiated server capabilities for a serving session control node, selecting, by the interrogating session control node, a serving session control node based on the one or more received UE initiated server capabilities in the user authorization answer message.