PSSCH DMRS and PSCCH Mapping for Compatible NR V2X Links
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Solution Overview
Problem
Conventional UEs designed to conform with the NR V2X protocol face performance issues due to ambiguous conditions for allocating PSSCH DMRS and PSCCH to the same OFDM symbol, leading to potential incompatibilities and communication failures.
Innovation Solution
A method for determining whether to allocate PSSCH DMRS and PSCCH to the same OFDM symbol based on the number and size of subchannels, with specific conditions ensuring accurate mapping and compatibility among devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If PSSCH DMRS and PSCCH are allocated to the same OFDM symbol without specific conditions, then resource utilization may be improved, but mapping ambiguity and device incompatibility occur
Solution Approach 1:
The patent applies parameter changes by establishing specific conditions based on subchannel size thresholds. When the subchannel size is less than 20 PRBs, PSSCH DMRS and PSCCH are mapped to different OFDM symbols; when the subchannel size is 20 PRBs or more, they can be mapped to the same OFDM symbol. This parameter-based conditional mapping resolves the contradiction by adapting the mapping strategy to the actual resource configuration, ensuring both efficient resource utilization and reliable device compatibility.
2Adaptability or versatility
If ambiguous mapping conditions are used for PSSCH DMRS and PSCCH, then implementation flexibility is increased, but communication reliability deteriorates
Solution Approach 1:
The patent implements dynamic mapping conditions that adapt to different subchannel configurations. The mapping strategy is not fixed but dynamically adjusted based on the subchannel size parameter. This dynamic approach maintains implementation flexibility while ensuring communication reliability by providing clear, unambiguous mapping rules for each specific configuration scenario, eliminating the reliability issues caused by ambiguous conditions.
3Device complexity
If PSSCH DMRS and PSCCH mapping follows conventional NR V2X protocol without additional conditions, then protocol simplicity is maintained, but device incompatibility increases
Solution Approach 1:
The patent applies local quality by introducing targeted mapping conditions specifically for PSSCH DMRS and PSCCH allocation while maintaining the overall simplicity of the NR V2X protocol. The additional conditions are localized to the resource mapping aspect rather than complicating the entire protocol stack. This approach enhances device compatibility and prevents communication failures without significantly increasing overall protocol complexity.
Data Source
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AI summary
An apparatus and a method for effectively mapping a reference signal for vehicle-to-everything (V2X) communication in a wireless communication system are provided. A transmission terminal performing the V2X communication includes a processor generating sidelink control information (SCI) and a transceiver transmitting the generated SCI to a reception terminal through a physical sidelink control channel (PSCCH) and a physical sidelink shared channel (PSSCH). A decision on whether to allocate a demodulation reference signal (DMRS) of the PSSCH and the PSCCH to the same orthogonal frequency division multiplexing (OFDM) symbol is made based on a number of subchannels and at least one sized thereof.