MSC Pool Redistribution for SGs-Attached UEs
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Solution Overview
Problem
Current MSC Pool Redistribution functions are unable to effectively redistribute User Equipment (UE) registrations attached via SGs/Gs-interfaces, rendering them unable to completely offload a MSC, especially with the increasing trend of LTE radio using SGs attachment, making the standard redistribution function useless.
Innovation Solution
A method and system for redistributing UE registrations from a first MSC to a second MSC within a pool, where the UE is attached via a packet control node, involving the packet control node triggering a routing or tracking area update procedure to register the UE to the second MSC, enabling redistribution of UE registrations across the pool, including those attached via SGs/Gs-interfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the standard MSC Pool Redistribution function is used, then UE registrations attached via BSC/RNC can be redistributed, but UE registrations attached via SGs/Gs-interfaces cannot be redistributed
Solution Approach 1:
The patent extends the MSC Pool Redistribution function to handle both traditional BSC/RNC-attached UEs and packet control node-attached UEs (via SGs/Gs-interfaces) through a unified redistribution mechanism. The system now supports multiple attachment types through a common redistribution architecture, making the function universal across different UE attachment scenarios.
Solution Approach 2:
The patent introduces a redistribution message as an intermediary mechanism that enables communication between the MSC and the packet control node (MME/SGSN). This message carries the necessary information to trigger area update procedures for packet control node-attached UEs, facilitating their redistribution without requiring direct UE-MSC interaction.
2Productivity
If LTE radio attachments increase, then the number of UE registrations via SGs-interface increases, but the standard redistribution function becomes useless
Solution Approach 1:
The patent implements a dynamic redistribution mechanism that adapts to the UE's attachment type. The system determines whether a UE is attached via BSC/RNC or packet control node and applies the appropriate redistribution procedure accordingly. This dynamic approach ensures the redistribution function remains effective regardless of the proportion of LTE attachments.
Solution Approach 2:
The patent changes the operational parameters of the redistribution function by introducing new message types and procedures specific to packet control node-attached UEs. The redistribution message includes parameters such as target MSC identifier and area information, enabling the function to operate effectively for both traditional and LTE attachments.
3Reliability
If UE registration redistribution is implemented for packet control node-attached UEs, then complete offload capability is achieved, but system complexity increases
Solution Approach 1:
The patent segments the redistribution mechanism into distinct components: identification of packet control node-attached UEs, sending of redistribution messages, triggering of area update procedures, and handling of target MSC selection. This segmentation allows each component to be implemented and managed independently, reducing overall system complexity.
Solution Approach 2:
The patent enables the packet control node (MME/SGSN) to autonomously handle the redistribution of packet control node-attached UEs by processing redistribution messages and triggering area update procedures without requiring complex external coordination. This self-service capability simplifies the overall redistribution architecture.
Data Source
AI summary
A system, methods, nodes and computer program for redistributing a registration of a UE from a first MSC to a second MSC is provided. The first MSC and the second MSCs are members of a pool of MSCs. The UE is registered in the first MSC and is attached to the first MSC via a packet control node such as MME or SGSN. The first MSC receives an order from an O&M center to redistribute the registrations of UEs in the pool. The first MSC sends a redistribution order to the packet control node. The packet control node triggers the UE to perform a routing or tracking area update procedure and triggers a location area update procedure to the second MSC, causing the UE to be registered to the second MSC.