Dynamic S-CSCF Server Assignment via HSS Load Evaluation
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Solution Overview
Problem
In current IP Multimedia Subsystem (IMS) networks, the allocation of S-CSCF servers for call session control leads to uneven distribution of user equipment, resulting in concentrated loads and potential server overload due to static registration status changes.
Innovation Solution
A method and system that utilize a S-CSCF server selection table within the Home Subscriber Server (HSS) to dynamically assign S-CSCF servers based on current operation conditions, prioritizing servers with lower loads to ensure even distribution of user equipment and balanced server usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If static registration status changes are used for S-CSCF server assignment, then the assignment process is simple, but the load distribution becomes uneven and servers may be overloaded
Solution Approach 1:
The patent implements dynamic S-CSCF server assignment by introducing a load evaluation mechanism that continuously monitors and adjusts server assignments based on current operational conditions. The HSS server dynamically selects S-CSCF servers by evaluating real-time load status, ensuring balanced distribution while maintaining system reliability under varying traffic conditions.
2Reliability
If dynamic load-based assignment is implemented, then server load balance is improved, but the system complexity increases
Solution Approach 1:
The patent introduces an intermediary load evaluation mechanism between the HSS server and S-CSCF servers. This intermediary component automatically assesses server load conditions and provides guidance for balanced assignment, reducing the complexity burden on individual components while achieving overall system optimization through coordinated interaction.
3Speed
If S-CSCF servers are assigned without considering current operation conditions, then the assignment process is fast, but server overload occurs
Solution Approach 1:
The patent implements preliminary load evaluation and server selection by the HSS server before actual user equipment registration. By pre-assessing S-CSCF server conditions and determining optimal assignments in advance, the system achieves both fast assignment speed and reliable load distribution, avoiding server overload while maintaining efficient processing.
Data Source
AI summary
The present invention provides a call session control server assignment method and system for equalizing loads of a plurality of call session control servers (S-CSCF servers). For this end, the HSS server 40 is provided with an S-CSCF selection table 41A that stores priority information indicating the order of priority at the time of assigning user equipment in response to the current operation condition of the plurality of S-CSCF servers 20, 21, 22 and the like in correspondence with the respective S-CSCF servers. When an interrogating call session control server (I-CSCF server) 30 sends an interrogation to the HSS server 40 for determining a particular S-CSCF server for registering the user equipment and administering a call session control for the user equipment at the registration time of the user equipment, a reference is made to the S-CSCF selection table 41A for selecting a particular S-CSCF server to be assigned in response to the current operation condition of the respective S-CSCF servers 20, 21, 22 and the like and also the information in the S-CSCF selection table 41A is sent back to the I-CSCF server 30.