Adaptive Handover Response Time for Wireless Positioning Accuracy
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Solution Overview
Problem
Current wireless communication systems fail to extend the response time for devices to compute a position fix after a handover command, leading to inaccurate location estimates during critical situations like emergency E911 scenarios, where devices lack sufficient time to measure signals from satellite vehicles (SVs) and report their position, resulting in stale or outdated location information.
Innovation Solution
The system allows devices to determine and send an extended time (tE) to the network after a handover command, receive an indication of acceptance, and use this extended time (tE) to compute a position fix based on satellite vehicle measurements and external course position injection (EPI) data, transmitting the position report at a reporting time dependent on tE, thereby ensuring sufficient time for accurate positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the network device uses the standard response time after handover, then the system maintains standard signaling timing, but the device lacks sufficient time to compute accurate position fix and report location
Solution Approach 1:
The patent applies dynamics by making the response time flexible and adaptive rather than fixed. The network device dynamically adjusts the response time based on whether a handover command was received, extending it when necessary to allow sufficient time for position computation and reporting, thereby resolving the contradiction between maintaining standard timing and ensuring accurate positioning.
Solution Approach 2:
The patent changes the time parameter dynamically based on handover conditions. When a handover command is detected, the response time parameter is extended beyond the standard value, allowing the device adequate time to compute position fix using satellite signals and report accurate location information to the network.
2Measurement precision
If the network device extends the response time to allow position computation, then positioning accuracy improves, but signaling efficiency and latency increase
Solution Approach 1:
The system dynamically adjusts response time only when necessary (upon detecting handover command), rather than always extending it. This conditional extension maintains signaling efficiency during normal operations while ensuring positioning accuracy only when handover occurs, thus resolving the contradiction between accuracy and efficiency.
Solution Approach 2:
The response time parameter is changed selectively based on handover conditions. The network device monitors for handover commands and only extends the response time parameter when such commands are detected, maintaining standard efficient signaling otherwise, thereby balancing positioning accuracy needs with overall signaling efficiency.
3Stability of the object's composition
If the device waits for network confirmation of extended time, then timing coordination is maintained, but the overall response delay increases
Solution Approach 1:
The network device performs preliminary detection of handover commands and proactively extends the response time before position computation begins. This preliminary action allows the device to start position fixing immediately with the extended time already in place, rather than waiting for confirmation, thus maintaining timing coordination while reducing overall delay.
Solution Approach 2:
The extended response time acts as an intermediary mechanism that coordinates between the handover event and position reporting. By establishing this intermediate time extension upon detecting handover, the system maintains proper timing coordination between network and device while allowing sufficient time for accurate position computation and reporting.
Data Source
AI summary
Disclosed are systems and techniques for wireless positioning. For example, a network device can receive, from a network entity at a handover time, a handover command. The network device can determine, based on receiving from the network entity the handover command at the handover time, an extended time. The network device can transmit, to the network entity, the extended time. The network device can receive, from the network entity, an indication of acceptance by the network entity of the extended time as an updated response time. The network device can determine, based on receiving the indication of acceptance from the network entity, position(s) of the network device based on measurements of signals transmitted from satellite vehicles (SVs) and external course position injection (EPI) data. The network device can transmit, to the network entity at a reporting time, the determined position(s).