Inter-RAT Location Session Continuity via Protocol Compatibility
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Solution Overview
Problem
Wireless communication systems face challenges in maintaining continuity of location-based services when a user equipment (UE) transitions between different radio access technologies (RATs), due to incompatibility of positioning protocols, leading to potential disruptions in service.
Innovation Solution
The method involves performing an inter-RAT system change for a UE from a source base station of a first RAT to a target base station of a second RAT, determining if a position location session has started, and assessing protocol compatibility. If compatible, the session continues using the first RAT's protocol; if not, it restarts or awaits network initiation for a new session, or initiates with the second RAT's protocol if the session hasn't begun.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If inter-RAT system change is performed from source base station to target base station, then mobility and network flexibility are improved, but position location session continuity deteriorates due to positioning protocol incompatibility
Solution Approach 1:
The network determines positioning protocol compatibility between source and target RATs before completing the handover. This preliminary assessment allows the network to prepare appropriate actions (continue, restart, or await new session) to ensure location session continuity is maintained during the mobility transition.
Solution Approach 2:
The system implements a feedback mechanism where the network evaluates whether the positioning protocol of the source RAT is compatible with the target RAT after handover. Based on this feedback, the network selectively continues existing location sessions or initiates new ones, thereby maintaining service reliability during inter-RAT mobility.
2Reliability
If positioning protocol compatibility is checked after handover, then location session continuity is improved, but service disruption time increases due to protocol assessment and potential session restart
Solution Approach 1:
The network performs positioning protocol compatibility determination during the handover process itself, rather than after completion. This preliminary action ensures that if incompatibility is detected, the network can immediately initiate appropriate corrective measures, minimizing the time location services are disrupted.
3Reliability
If position location session is continued with source RAT protocol, then service continuity is improved, but compatibility issues arise with target RAT
Solution Approach 1:
The network evaluates protocol compatibility as a feedback mechanism after handover. When compatibility is confirmed, the original session continues seamlessly. When incompatibility is detected, the network switches to alternative actions (restart or new session with target RAT protocol), thus adapting to different RAT environments while maintaining service continuity.
Data Source
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AI summary
When a user equipment engaged in mobile communications transfers from a network with one radio access technology (RAT) to another network with a different radio access technology, maintaining continuity of location based services can improve system performance. A user equipment may perform a series of checks when undergoing inter-RAT transfer to determine if a location based services protocol used with the source network is operable on the target network. The UE also determines if location based services sessions are at a point where they can be continued following inter-RAT transfer. Where possible, protocols and sessions are maintained to preserve location based services continuity.