Handover Protocol Adaptation for Wireless Positioning Sessions
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Solution Overview
Problem
Handover events between different wireless access types during position determination sessions can disrupt the process of obtaining a position fix for mobile devices, as the first positioning protocol may not be enabled or supported by the second access type, leading to inaccurate or failed location estimates.
Innovation Solution
Transitioning to a second positioning protocol that is supported by the new wireless access type during a handover event, allowing the position determination session to resume or restart using the new protocol.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a first positioning protocol is used during a position determination session, then location estimation can be performed accurately for the current wireless access type, but the positioning session is disrupted when handover occurs to a different wireless access type that does not support the first positioning protocol
Solution Approach 1:
The system changes the positioning protocol parameter based on the wireless access type. When handover occurs, the mobile device detects the new access type and transitions to a second positioning protocol that is supported by the new access type, thereby maintaining positioning session continuity while adapting to changed conditions
Solution Approach 2:
The positioning protocol is made dynamic rather than static. The system continuously monitors wireless access type changes and adapts the positioning protocol accordingly, allowing the positioning session to remain active and accurate across different network conditions and access types
2Reliability
If the mobile device remains on the first wireless access type to maintain positioning session continuity, then positioning protocol compatibility is preserved, but the device cannot optimize for better radio conditions or move to new coverage areas
Solution Approach 1:
The system allows changes in wireless access type parameter while compensating through protocol adaptation. The mobile device can handover to different access types for better radio conditions or coverage, and the positioning protocol is相应 adjusted to maintain session continuity and accuracy
Solution Approach 2:
The mobile device is equipped with multiple positioning protocol capabilities to function across different wireless access types. By supporting both first and second positioning protocols, the device can seamlessly transition between access types while maintaining positioning functionality, achieving multi-access-type versatility
3Reliability
If a second positioning protocol is initiated after handover to a new wireless access type, then positioning session continuity is maintained with accurate location estimation, but additional signaling and protocol transition overhead is introduced
Solution Approach 1:
The mobile device is pre-configured with knowledge of multiple positioning protocols and their compatibility with different wireless access types. This preliminary preparation allows for rapid protocol switching during handover without extensive real-time negotiation or complex decision-making processes
Solution Approach 2:
The system uses feedback from handover detection to trigger protocol transition. When the mobile device detects it has handover to a new access type, this feedback triggers the selection and initiation of the appropriate second positioning protocol, creating a responsive and automated protocol adaptation mechanism
Data Source
AI summary
Disclosed are systems, methods and devices for responding to changes in a wireless access type occurring in connection with a handover event affecting a mobile terminal while the mobile terminal is engaged in a position determination session with a location server. If a first positioning protocol employed in the position determination session is not supported or enabled by the changed wireless access type, the position determination session may be resumed or restarted using a second positioning protocol supported or enabled by the changed wireless access type.