Sidelink Positioning Reference Signal Activation via MAC Control Elements
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Solution Overview
Problem
The increasing demand for accurate and rapid positioning in 5G wireless communication systems, particularly in sidelink configurations, is not adequately addressed by existing methods, which face challenges in implementing effective sidelink positioning techniques.
Innovation Solution
A method and apparatus for sidelink positioning in 5G mobile communication systems, involving the reception of SystemInformationBlock12, performing sidelink discovery, receiving RRCReconfigurationSidelink, transmitting SL MAC CE, and initiating SL-PRS measurement based on the NR-SL_PRS_ResourceSet ID field from the Activation_Time field, utilizing A/D field and NR-SL_PRS_ResourceSet ID field for sidelink positioning reference signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If sidelink positioning is implemented in 5G systems, then positioning accuracy and speed are improved, but system complexity and implementation difficulty increase
Solution Approach 1:
The patent segments the sidelink positioning process into distinct phases: system information reception (SIB12), sidelink discovery, RRC reconfiguration, MAC CE transmission, and SL-PRS measurement. Each phase is handled by specific protocol layers (RRC, MAC, PHY) with dedicated functions, reducing overall system complexity through modular organization.
Solution Approach 2:
The patent introduces MAC Control Elements (MAC CEs) as intermediary messages between User Equipment (UE) for coordinating sidelink positioning. These MAC CEs carry activation/deactivation commands and resource set identifiers, serving as standardized intermediaries that simplify the interaction complexity between positioning entities.
2Measurement precision
If sidelink discovery and positioning procedures are added, then positioning capability is improved, but transmission latency increases
Solution Approach 1:
The patent implements preliminary configuration of sidelink positioning resources through system information (SIB12) and RRC reconfiguration messages before actual positioning measurements. The Activation_Time field in MAC CEs allows UEs to pre-configure measurement resources and timing, so that when positioning is activated, measurements can begin immediately without additional setup latency.
Solution Approach 2:
The patent enables continuous sidelink positioning measurements through periodic SL-PRS transmissions and continuous MAC CE monitoring. Once positioning is activated, the system maintains continuous measurement capability with periodic resource allocations, eliminating gaps in positioning functionality and reducing overall latency for dynamic positioning requirements.
Data Source
AI summary
A Method and Apparatus for sidelink positioning is provided. The method includes receiving a SystemInformationBlock12 in a first cell, performing sidelink discovery with a type2 UE, receiving from a RRCReconfigurationSidelink, transmitting a first SL MAC CE, receiving a second SL MAC CE, starting to measure SL-PRS based on the NR-SL_PRS_ResourceSet ID field from the time point determined based on the Activation_Time field, transmitting a first SL MAC CE. The first MAC CE includes a A/D field and a NR-SL_PRS_ResourceSet ID field and a Activation_Time field. The A/D field is set to a first value. The second MAC CE includes a A/D field and a NR-SL_PRS_ResourceSet ID field and a Activation_Time field. The A/D field is set to a first value. The second MAC CE includes a A/D field and a NR-SL_PRS_ResourceSet ID field. The A/D field is set to a second value.