Automatic Neighbour Relation for Tracking Area Mapping
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Solution Overview
Problem
Maintaining accurate Tracking Area/Location Area mappings in mobile cellular telephony is challenging, especially with the increasing dynamic nature of user-provided microcells (femtocells), which are often privately owned and not under direct network control, making manual updates impractical and prone to errors, leading to extended call set-up times and potential connection failures.
Innovation Solution
The system automatically updates the TA/LA mapping table in real-time using neighbour cell information from mobile terminals, which is then forwarded to the base stations and the network management system, leveraging the Automatic Neighbour Relation function to maintain dynamic and accurate mappings between Tracking Areas and Location Areas across different networks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If manual updates are used to maintain TA/LA mapping tables, then mapping accuracy can be maintained, but the process becomes impractical and error-prone with dynamic microcells
Solution Approach 1:
The system enables automatic self-updating of TA/LA mappings by leveraging the Automatic Neighbour Relation (ANR) function. Base stations automatically discover and register neighbour cells, and the MME automatically maintains mapping tables without manual intervention, allowing the system to service itself in maintaining accurate mappings despite dynamic network changes
Solution Approach 2:
The system implements feedback mechanisms where base stations report neighbour cell information to the MME, which then updates the mapping tables accordingly. This continuous feedback loop ensures mappings remain accurate as the network evolves, with the MME receiving real-time information and automatically adjusting the TA/LA mappings
2Measurement precision
If manual mapping updates are performed, then mapping accuracy can be maintained, but call set-up times extend and connection failures increase
Solution Approach 1:
The system performs preliminary actions by pre-establishing and maintaining accurate TA/LA mappings before calls need to be set up. The MME continuously updates mappings in advance based on network changes, so when a call arrives, the correct mapping is already in place, eliminating delays and failures associated with manual updates
Solution Approach 2:
The system maintains continuous updating of TA/LA mappings through automated mechanisms. The MME continuously receives neighbour cell information from base stations and continuously maintains the mapping tables, ensuring mappings are always current without interruption, thereby preventing call set-up delays and failures
3Adaptability or versatility
If user-provided microcells are deployed, then network coverage and flexibility improve, but maintaining accurate TA/LA mappings becomes more difficult
Solution Approach 1:
The system enables automatic self-updating of TA/LA mappings by leveraging the Automatic Neighbour Relation (ANR) function. Base stations automatically discover and register neighbour cells, and the MME automatically maintains mapping tables without manual intervention, allowing the system to service itself in maintaining accurate mappings despite dynamic network changes
Solution Approach 2:
The system adapts to network changes by dynamically updating mapping parameters. When microcells are added or removed, or when their locations change, the ANR function detects these changes and automatically updates the TA/LA mappings with new parameters, maintaining accuracy despite the dynamic and flexible nature of user-provided microcells
Data Source
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AI summary
A mobile terminal (11) transmits data to a base station (1) of a first network relating to neighbour base stations (13) of a second network. The base station (1) transmits the neighbour data to a network management processor (12) controlling the mobile communications system, which maintains a mapping data store (27) associating the base station with the neighbour base stations. The mapping facilitates a dual attachment process which allows connection of terminals to both networks, thus facilitating transfer of connection between networks.