Cellular Network Tracking Area Code Management
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Solution Overview
Problem
In cellular telecommunications networks, there is a challenge in managing the transition from older circuit switched voice services to newer packet switched data transmission protocols, particularly in maintaining access to emergency services for users who only support circuit switched voice services.
Innovation Solution
A method is introduced where a management node determines whether a base station supports circuit switched voice services by tracking area codes, and accordingly directs User Equipment (UE) to connect to base stations that provide such services, ensuring seamless communication for users requiring circuit switched voice services.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If older circuit switched infrastructure is maintained to provide emergency services access, then reliability for emergency services is improved, but device complexity and operational cost increase
Solution Approach 1:
The network is segmented into multiple tracking areas with different service capabilities. Base stations are divided into those supporting circuit-switched voice (first tracking area code) and those supporting only packet-switched data (second tracking area code). This segmentation allows UEs requiring emergency services to be directed to appropriate base stations while maintaining overall network simplicity.
Solution Approach 2:
The management node acts as an intermediary between base stations and UEs. It receives tracking area update requests from base stations, determines service capabilities based on stored tracking area codes, and directs UEs to appropriate base stations. This intermediary simplifies the complexity by centralizing the decision-making logic.
2Measurement precision
If tracking area update requests are processed for all UEs, then network management accuracy is improved, but signaling overhead and processing time increase
Solution Approach 1:
Instead of processing tracking area updates for all UEs equally, the system applies partial action by only performing full verification for UEs that may require circuit-switched services. The management node selectively processes requests based on UE type and service requirements, reducing overall signaling overhead while maintaining necessary precision for critical services.
Data Source
AI summary
This disclosure provides a method of operating a management node in a cellular telecommunications network, the cellular telecommunications network including a first base station and a User Equipment (UE), the management node storing a first set of tracking area codes, wherein the first base station is configured to transmit a first tracking area code and the UE is configured to send a tracking area update request message to the first base station identifying the first tracking area code, the method including receiving a request message from the first base station, the request including the first tracking area code identified in the tracking area update request message; comparing the received first tracking area code to the first set of tracking area codes; and sending a response message to the first base station, the response message accepting or rejecting the tracking area request based on the comparison.