Relay Node Positioning With Adaptive Timing Advance in 5G NR
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Solution Overview
Problem
Existing wireless communication systems face challenges in accurately determining timing advance values for relay nodes, which affect the efficiency and accuracy of positioning in 5G new radio (NR) networks.
Innovation Solution
A first wireless transmit/receive unit (WTRU) receives configuration information and RSRP measurements from a second WTRU to determine and transmit a timing advance value, adjusting based on RSRP measurements and thresholds to optimize SRSp transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If relay node assisted positioning is implemented using existing 5G NR systems, then positioning capability is provided, but timing advance determination accuracy deteriorates due to relay node complexity
Solution Approach 1:
The relay node acts as an intermediary between the network and the target WTRU. It receives SRSp configuration from the network, performs RSRP measurements, determines timing advance values, and transmits these to the target WTRU. This mediator approach enables positioning capability while managing the complexity of timing advance determination through standardized measurement and calculation procedures.
2Measurement precision
If dynamic timing advance adjustment based on RSRP measurements is performed, then positioning accuracy is improved, but system complexity increases
Solution Approach 1:
The system implements a feedback mechanism where the relay node continuously measures RSRP values, compares them against threshold criteria, and dynamically adjusts timing advance values accordingly. This feedback loop enables accurate positioning through adaptive timing adjustment while maintaining system manageability through standardized comparison operations.
Solution Approach 2:
The timing advance parameter is dynamically adjusted based on RSRP measurement results. When RSRP exceeds the second threshold, a first timing advance value is applied; when RSRP is between thresholds, a second timing advance value is applied; otherwise, the configuration is released. This parameter adjustment approach improves positioning accuracy through systematic variation of timing parameters based on measured signal conditions.
3Measurement precision
If multiple RSRP measurements are performed for timing advance determination, then timing advance accuracy is improved, but measurement time increases
Solution Approach 1:
The system performs RSRP measurements selectively based on configured thresholds rather than continuously or excessively. The relay node measures RSRP, compares it against the first and second threshold values, and applies timing advance adjustments only when necessary. This partial action approach achieves sufficient timing advance accuracy without unnecessary measurement time consumption.
Data Source
AI summary
Systems, methods, and instrumentalities may be configured for supporting relay node assisted positioning. A first wireless transmit/receive unit (WTRU) may receive, from a network node, configuration information indicating a Sounding Reference Signal for positioning (SRSp) configuration. The SRSp configuration may be associated with a second WTRU, a reference Timing Advance (TA) value associated with the first WTRU, a first threshold value, and a second threshold value. The first WTRU may receive, from the second WTRU, a first RSRP measurement. The first WTRU may determine a first TA value associated with the second WTRU, wherein the determination of the first TA value is based on the first RSRP measurement, the reference TA value, and a measurement associated with the network node. The first WTRU may transmit to the second WTRU, the SRSp configuration and the first TA value for the second WTRU.