Positioning Reference Signal Accuracy in Full Duplex Systems
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Solution Overview
Problem
Full duplex operations in wireless communication systems diminish the efficiency of terrestrial positioning processes by increasing self-interference and reducing the accuracy of position estimates due to wider PRS beam widths and overlapping downlink and uplink transmissions.
Innovation Solution
Implementing a method that determines positioning reference signal transmissions based on accuracy requirements, including the use of half duplex and full duplex slots, and providing position measurement information to base stations while indicating the duplex mode configuration, along with a positioning reference signal muting pattern to manage self-interference by muting PRS transmissions in full duplex slots.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If full duplex operations are implemented to enable simultaneous downlink and uplink transmissions, then communication efficiency is improved, but positioning accuracy deteriorates due to self-interference and wider PRS beam widths
Solution Approach 1:
The patent segments the transmission time into half duplex slots and full duplex slots. In half duplex slots, only downlink PRS transmissions occur without uplink interference. In full duplex slots, both downlink and uplink transmissions occur simultaneously. This segmentation allows positioning measurements to be performed in interference-free time periods while maintaining full duplex operation in other periods.
Solution Approach 2:
The patent performs positioning reference signal transmissions in half duplex slots before the full duplex operations begin, ensuring that positioning measurements are obtained in advance when no self-interference is present. This preliminary positioning measurement avoids the accuracy degradation that would occur during full duplex operations.
2Productivity
If PRS transmissions are performed in full duplex slots to maintain continuous positioning updates, then positioning frequency is improved, but measurement accuracy deteriorates due to overlapping uplink transmissions
Solution Approach 1:
The patent implements a periodic pattern of half duplex slots followed by full duplex slots. Positioning reference signal transmissions occur periodically in the half duplex slots, while full duplex operations occur in subsequent slots. This periodic alternation ensures that positioning measurements are taken at regular intervals when interference is absent, maintaining measurement accuracy while allowing continuous full duplex communication.
3Area of stationary object
If wider PRS beam widths are used in full duplex mode to maintain coverage, then signal coverage is improved, but positioning accuracy deteriorates
Solution Approach 1:
The patent segments the PRS transmissions into those occurring in half duplex slots (without self-interference) and those in full duplex slots (with self-interference). By performing the critical positioning measurements in the interference-free half duplex slots, the system can use the required beam widths for coverage while maintaining accuracy, as the measurements are taken when no uplink transmission interference is present.
Data Source
AI summary
Techniques are provided for utilizing positioning reference signals (PRS) in full duplex scenarios. An example method of providing positioning information for a mobile device to a base station includes receiving, at the mobile device, a positioning request and an accuracy requirement from the base station, determining one or more positioning reference signal transmissions based on the accuracy requirement, obtaining position measurement information based on the one or more positioning reference signal transmissions, and providing the position measurement information to the base station.