Wireless Positioning Timing Compensation for Multi-Carrier Accuracy
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Solution Overview
Problem
Current positioning methods in wireless communication networks face challenges in accurately determining the position of devices, especially in urban and indoor environments, due to unsatisfactory performance of GPS-based systems and the impact of timing advances on uplink positioning measurements in multi-carrier operations.
Innovation Solution
The implementation of a method that involves obtaining and compensating for timing measurement values based on transmit timing adjustments applied by wireless devices, allowing for improved positioning accuracy by accounting for these adjustments in measurement procedures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If GPS-based positioning is used, then positioning can be provided in open environments, but positioning performance becomes unsatisfactory in urban and indoor environments
Solution Approach 1:
The patent changes the positioning parameters from GPS satellite signals to cellular network signals (downlink and uplink transmissions). By using cellular signals as the positioning basis instead of GPS signals, the system achieves reliable positioning in urban and indoor environments where GPS is blocked, while maintaining acceptable positioning accuracy through timing-based measurement methods.
2Reliability
If timing advance is applied for uplink transmission alignment, then uplink timing synchronization is improved, but positioning measurement accuracy deteriorates due to unknown timing adjustments
Solution Approach 1:
The patent implements a feedback mechanism where the network node obtains timing adjustment information from the wireless device and uses this feedback to compensate positioning measurements. The wireless device provides information about transmit timing adjustments it has applied, and the network node uses this feedback to correct the positioning measurements, thereby maintaining both timing synchronization and measurement accuracy.
Solution Approach 2:
The patent applies preliminary action by having the wireless device calculate and report timing adjustment information before positioning measurements are taken. The device prepares the timing adjustment data in advance, allowing the network node to pre-compensate for timing effects before performing the actual positioning measurement, thus eliminating the accuracy degradation caused by timing advances.
3Reliability
If transmit timing adjustment is applied by wireless device, then uplink transmission alignment is achieved, but positioning accuracy decreases due to unaccounted timing shifts
Solution Approach 1:
The patent introduces timing adjustment information as an intermediary element that mediates between the transmit timing adjustment and the positioning measurement. This intermediary information acts as a bridge, allowing the network node to understand and compensate for the timing shifts introduced by the wireless device's transmission alignment adjustments, thereby preserving positioning accuracy.
Data Source
AI summary
Conventional positioning methods based on measurements of wireless device transmissions may fail to account for adjustments to uplink transmit timing made by the wireless device. Problems caused by this failure may become even more severe when multiple timing advances are applied on different carriers, in multi-carrier operation where the carriers are non-co-located. One example method for handling timing measurements used for positioning, according to several of the techniques detailed herein, begins with obtaining (810) one or more timing measurement values for timing measurements performed on radio signals transmitted by a wireless device. Information related to one or more transmit timing adjustments applied to radio signal transmissions by a wireless device is also obtained (820). Finally, one or more of the timing measurement values are compensated (830) with a compensation value, based on the obtained information related to the one or more transmit timing adjustments applied by the wireless device.