V2X Reference Signal Mapping for DMRS-PSCCH Symbol Allocation
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Solution Overview
Problem
Existing 5G V2X communication systems face performance issues due to ambiguous conditions for allocating demodulation reference signals (DMRS) and physical sidelink control channels (PSCCH) to the same OFDM symbol, leading to incompatibility among devices.
Innovation Solution
A method and apparatus for determining the allocation of DMRS and PSCCH to the same OFDM symbol based on the number and size of subchannels, ensuring consistent and effective communication in V2X systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If DMRS and PSCCH are allocated to the same OFDM symbol, then resource utilization efficiency is improved, but device compatibility deteriorates due to ambiguous allocation conditions
Solution Approach 1:
The patent changes the parameter of DMRS-PSCCH mapping relationship from ambiguous to deterministic by introducing specific conditions: when subchannel size is less than 20 PRBs, DMRS and PSCCH are mapped to different OFDM symbols; when subchannel size is 20 PRBs or more, they are mapped to the same OFDM symbol. This parameter-based differentiation resolves the contradiction by providing clear allocation rules that improve both resource utilization and device compatibility.
2Reliability
If clear allocation conditions are established for DMRS and PSCCH, then device compatibility is improved, but system flexibility deteriorates
Solution Approach 1:
The patent implements dynamic allocation conditions where the mapping relationship between DMRS and PSCCH adapts based on subchannel size. The system flexibly adjusts the mapping rule according to the specific subchannel configuration, allowing clear conditions to be established for each scenario while maintaining overall system flexibility through conditional adaptability.
3Reliability
If DMRS and PSCCH are mapped to different OFDM symbols, then device compatibility is improved, but resource utilization efficiency deteriorates
Solution Approach 1:
The patent resolves this contradiction by making the mapping relationship parameter-dependent. Instead of universally mapping DMRS and PSCCH to different symbols, the system dynamically selects the mapping strategy based on subchannel size parameters, achieving both device compatibility and resource utilization efficiency in different scenarios.
Data Source
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.