Sidelink Positioning via Discontinuous Reception Patterns
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Solution Overview
Problem
Current positioning technologies using Position Reference Signals (PRS) are limited to classical cellular scenarios and do not effectively support inter-UE positioning for vehicular and industrial applications when UEs are out of coverage or in partial coverage, requiring improved methods for accurate positioning without involving the base station.
Innovation Solution
A method for a first radio node to generate and transmit a ranging request with a position calculation indication to a second radio node during its active reception period, defined by a discontinuous reception pattern, allowing the second radio node to respond with a position reference signal in a side link resource pool, thereby enabling accurate positioning while reducing power consumption and extending battery life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If continuous transmission of position reference signals is used for accurate positioning, then positioning accuracy is improved, but power consumption increases
Solution Approach 1:
The patent implements discontinuous reception (DRX) patterns where the second radio node alternates between active reception periods and sleep periods. During active periods, the node receives position reference signals for positioning; during sleep periods, it conserves power by not receiving signals. This periodic action resolves the contradiction by providing positioning capability when needed while reducing power consumption during non-critical periods.
Solution Approach 2:
The first radio node transmits the ranging request with position calculation indication in advance, during an active reception period of the second node. This preliminary action ensures that the second node is already awake and ready to receive and process the position reference signal, eliminating the need for continuous monitoring and reducing overall power consumption while maintaining positioning accuracy.
2Reliability
If position reference signals are transmitted during all reception periods, then positioning reliability is improved, but resource waste occurs when nodes are in sleep mode
Solution Approach 1:
The patent dynamically adjusts the transmission timing of position reference signals to match the dynamic reception patterns of the second radio node. The first node transmits signals only during periods when the second node is in active reception mode, as indicated by the DRX pattern. This dynamic adaptation ensures reliable positioning communication when the receiver is active while avoiding resource waste during sleep periods.
3Adaptability or versatility
If UEs autonomously select sidelink resources from shared resource pools, then adaptability is improved, but resource conflicts increase
Solution Approach 1:
The patent employs a sensing and selection mechanism where the first radio node monitors the sidelink resource pool, identifies resources currently in use by other nodes, and selects available resources for transmitting position reference signals. This feedback-based resource selection reduces conflicts while maintaining autonomous operation, resolving the contradiction between adaptability and reliability.
Data Source
AI summary
A wireless communication method of a first radio node, for obtaining a position reference signal from at least a second radio node, based on a discontinuous reception pattern of at least the second radio node. The method includes: generating, at the first radio node, at least one ranging request; and transmitting the at least one ranging request comprising at least one position calculation indication to at least the second radio node such that at least the second radio node receives the at least one ranging request (SPRS) during an active reception period of at least the second radio node, wherein the active reception period of at least the second radio node is defined by a discontinuous reception pattern of at least the second radio node.