ANDSF Policy Validity Areas for Signaling Reduction
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Solution Overview
Problem
Current access network discovery and selection systems, such as ANDSF, face inefficiencies due to unnecessary signaling and data exchange when a user equipment (UE) moves into areas without defined access network policies, leading to increased signaling and unmanageable information transmission.
Innovation Solution
A communication device and method that determine primary and secondary information for access network policy transmission, specifying areas and times for UE to request policy updates, optimizing signaling by only providing relevant policy information based on current location and congestion levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the ANDSF continuously provides access network policy information to the UE when the UE moves, then the UE can maintain optimal network connectivity, but unnecessary signaling and data exchange increase when the UE moves into areas without defined policies
Solution Approach 1:
The ANDSF determines and provides secondary information (validity areas and location criteria) to the UE in advance, enabling the UE to proactively request policy information only when entering predefined areas of interest, rather than continuously requesting updates during movement
Solution Approach 2:
The UE is empowered to autonomously determine whether to request access network policy information by comparing its current location with the provided secondary information (validity areas and location criteria), eliminating the need for continuous network-initiated policy updates
2Loss of information
If the ANDSF sends comprehensive access network policy information to the UE, then the UE has complete information for network selection, but the information transmitted becomes unmanageable in size
Solution Approach 1:
The ANDSF extracts and provides only the essential secondary information (validity areas and location criteria) to the UE, separating this from the complete policy information database, thereby reducing transmitted data volume while maintaining policy information completeness when needed
Solution Approach 2:
The ANDSF pre-processes and provides location-based validity information to the UE in advance, enabling the UE to filter and request only relevant policy information for its current location, rather than transmitting all possible policy data
Data Source
AI summary
According to the invention in a first aspect, there is provided a communication device (114, 200) configured to form part of a telecommunications network and to carry out an access network discovery and selection function, ANDSF. The communication device comprises a receiver (204) configured to receive a request for access network policy information relating to a user equipment, UE, (100, 300) and current UE location data. The communication device comprises a policy information unit (214) configured to determine primary information comprising access network policy information for the UE based at least in part on the current UE location data. The policy information unit is further configured to determine secondary information specifying one or more further UE locations at which the UE should make a further request for access network policy information. The communication device comprises a transmitter (202) configured to transmit the primary and secondary information towards the UE.