Sidelink Positioning Reference Signal Sequence Generation
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Solution Overview
Problem
In sidelink communication, legacy user equipment (UE) configured to operate on shared resource pools may not be able to receive sidelink positioning reference signals (SL PRSs) and face challenges in measuring the reference signal received power (RSRP) of SL PRS transmissions, which affects positioning accuracy and resource utilization.
Innovation Solution
The method involves generating a sidelink positioning reference signal (SL PRS) resource transmission sequence that includes a de-modulation reference signal (DMRS) symbol, allowing legacy UEs to measure RSRP without interfering with their communication, by combining SL PRS and DMRS sequences using similar initialization equations and transmitting these sequences on shared resource pools.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If SL PRS transmissions are sent on shared resource pools, then resource utilization is improved, but legacy UEs cannot receive and measure these signals causing positioning accuracy to deteriorate
Solution Approach 1:
The patent combines SL PRS and DMRS into a single joint sequence transmission. The DMRS symbols are embedded within the SL PRS resource transmission, allowing legacy UEs to measure RSRP on DMRS symbols while advanced UEs can process the complete joint sequence for positioning. This merging enables both legacy and advanced UEs to coexist on shared resource pools simultaneously.
Solution Approach 2:
The joint sequence serves multiple functions: it acts as a positioning reference signal for advanced UEs and simultaneously provides demodulation reference signals for legacy UEs. This multi-functionality allows a single transmission to support both positioning operations and legacy communication measurements, resolving the contradiction between resource sharing and positioning accuracy.
2Adaptability or versatility
If DMRS symbols are embedded in SL PRS transmissions, then legacy UE RSRP measurement capability is improved, but sequence complexity increases
Solution Approach 1:
The patent changes the initialization parameters of the sequence generation based on the signal type. Different initialization values are used for SL PRS and DMRS portions within the joint sequence, allowing the system to generate appropriate signal characteristics while using a unified generation framework. This parameter-based differentiation manages complexity while maintaining versatility.
3Reliability
If SL PRS and DMRS are transmitted separately, then signal clarity is improved, but resource efficiency deteriorates
Solution Approach 1:
The patent merges SL PRS and DMRS into a single joint sequence that is transmitted together on the same time-frequency resources. This combining maintains signal integrity through proper sequence design while achieving efficient resource utilization by eliminating the need for separate transmissions of positioning and demodulation reference signals.
Data Source
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AI summary
There is provided an apparatus comprising: at least one processor; and at least one memory storing instructions that, when executed by the at least one processor, cause the apparatus, which is configured to perform sidelink positioning with another apparatus, at least to perform: transmitting, to the other apparatus, an indication that a sidelink positioning reference signal, SL PRS, resource transmission, which the apparatus is configured to transmit, comprises at least one de-modulation reference signal, DMRS, symbol; and generating a sequence of a SL PRS resource transmission comprising: a SL PRS sequence; and a DMRS sequence comprising at least one DMRS symbol; and transmitting the sequence of the SL PRS resource transmission at least to the other apparatus.