Call Routing via Control Nodes for Service Domain Selection
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Solution Overview
Problem
Current communication systems face inefficiencies in call routing, particularly in scenarios where both CS and IMS networks coexist, leading to increased delay and capacity requirements due to the need to route all calls through the IMS network, even when most calls are between CS access users.
Innovation Solution
A method and system that determine if user equipment is attached to a third control node, indicating specific service domain control, allowing the second control node to select routing information for the first control node to route calls accordingly, either through the second or third control node, thereby optimizing call establishment based on the service domain.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If all terminating calls are routed through the IMS network, then service uniformity and IMS voice over PS support are improved, but call set-up delay and network capacity requirements increase
Solution Approach 1:
The patent segments the call routing process into two distinct paths: one for CS access users (routed directly to MSC server) and one for PS access users (routed through IMS). This segmentation allows each user type to follow the most efficient routing path, avoiding unnecessary delays for CS users while maintaining IMS service uniformity for PS users.
Solution Approach 2:
The patent applies local quality by making the routing behavior dependent on the specific access type of the user equipment. CS access users receive direct routing to MSC server, while PS access users receive routing through IMS. This localized differentiation optimizes call set-up delay for each access type while maintaining appropriate service quality.
2Reliability
If all terminating calls are routed through the IMS network, then IMS service control is improved, but network capacity requirements increase
Solution Approach 1:
The patent segments the network capacity requirements by creating separate routing paths. CS access calls are handled by the traditional CS network infrastructure (MSC server), while PS access calls are handled by the IMS network. This segmentation prevents the entire network capacity from being consumed by IMS routing, reducing overall capacity requirements while maintaining IMS service control for appropriate users.
3Stability of the object's composition
If static domain selection is used to route all calls to IMS, then service consistency is improved, but routing flexibility is reduced
Solution Approach 1:
The patent implements dynamic domain selection by making routing decisions based on the real-time access type of the user equipment. Instead of a static routing policy, the system dynamically determines whether to route through IMS or directly to MSC server based on whether the user is accessing via CS or PS, providing both service consistency and routing flexibility.
Solution Approach 2:
The patent applies local quality by customizing the routing path according to the specific access type of each user. CS access users receive one routing treatment (direct to MSC), while PS access users receive another (through IMS). This localized routing approach maintains service consistency within each access type while providing overall routing flexibility across different access types.
Data Source
AI summary
A method for routing a terminating call to a user equipment via a first control node for controlling the call, wherein the user equipment is attached to a second control node which is adapted to provide routing information. The method comprises determining, by the second control node, if the user equipment is attached to the second control node over a third control node, wherein the attachment over the third control node indicates that call control shall be performed by a specific service domain. Based on the determining, the provided routing information is selected by the second control node, wherein the routing information indicates to the first control node if the further call establishment to the user equipment is controlled either by the second control node or by the third control node. The call is then routed, by the first control node, according to the selected routing information.