HSS and UDM Interworking for 5G-4G Mobility
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Solution Overview
Problem
Current architectures for interworking between 5G and 4G telecommunication networks lack flexibility in design and deployment choices for Home Subscriber Server (HSS) and Unified Data Management (UDM), particularly when components are from different vendors, limiting multi-vendor approaches and efficient mobility management.
Innovation Solution
A method and system that enable communication between user subscription nodes in different telecommunication networks to facilitate more flexible design and deployment by transmitting location removal messages, allowing HSS and UDM from different vendors to coexist and support mobility between 5G and 4G networks, with optimized signaling for interworking scenarios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If HSS and UDM are combined into a single functional unit for interworking between 5G and 4G networks, then the architecture is simplified and easier to implement, but the flexibility in design and deployment choices is reduced
Solution Approach 1:
The patent segments the HSS+UDM combination into separate HSS and UDM functional units, each capable of independent operation. This allows the system to maintain simplified interworking architecture while enabling flexible deployment choices for HSS and UDM from different vendors, thereby resolving the contradiction between architectural simplicity and design flexibility.
2Adaptability or versatility
If HSS and UDM operate as separate functional units from different vendors, then design flexibility and multi-vendor support are improved, but the complexity of interworking procedures increases
Solution Approach 1:
The patent introduces standardized interfaces and protocols as intermediaries between HSS and UDM from different vendors. These intermediaries facilitate coordinated operation between separate functional units, enabling multi-vendor support while managing interworking complexity through standardized communication mechanisms.
3Ease of operation
If location removal messages are transmitted between HSS and UDM for every UE mobility event, then user subscription management is improved, but signaling overhead and processing time increase
Solution Approach 1:
The patent implements preliminary actions by having HSS and UDM establish and maintain subscription data synchronization mechanisms in advance. This allows location removal messages to be transmitted more efficiently during UE mobility events, as the foundational data exchange framework is already in place, reducing the time required for signaling.
Data Source
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AI summary
A method for updating a location of a User Equipment, UE, when said UE moves from a first type of telecommunication network to a second type of telecommunication network, wherein said method comprises the steps of: -receiving, by a user subscription node comprised by said second type of telecommunication network, an indication that said UE has requested registration to said second type of telecommunication network; -determining, by said user subscription node comprised by said second type of telecommunication network, that said UE is registered in said first type of telecommunication network; -transmitting, by said user subscription node comprised by said second type of telecommunication network, a location removal message to a user subscription node comprised by said first type of telecommunication network for removing location information relating to said UE.