Sidelink Transmission With Shared DMRS for Spectrum Efficiency
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Solution Overview
Problem
Existing sidelink communication systems face inefficiencies in demodulation reference signal overhead and frequency spectrum utilization due to separate configurations of control and data channels, which impact performance in V2X scenarios.
Innovation Solution
Implementing a shared demodulation reference signal for control and data channels, using time-division multiplexing to map control information, target data, and demodulation reference signal onto a time unit, and optionally combining with frequency-division multiplexing to optimize resource usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If separate DMRS configurations are used for control and data channels, then demodulation accuracy is maintained, but reference signal overhead increases and spectrum utilization decreases
Solution Approach 1:
The patent combines separate DMRS configurations for control and data channels into a unified shared DMRS configuration. The transmitter configures a single DMRS that serves both the physical sidelink control channel (PSCCH) and physical sidelink shared channel (PSSCH), reducing the total number of reference signals while maintaining demodulation capability for both channel types through the shared reference signal structure.
Solution Approach 2:
The shared DMRS is designed to perform multiple functions simultaneously - it serves as the demodulation reference signal for both control information and data transmission. This multi-functional approach allows a single reference signal configuration to support both PSCCH and PSSCH demodulation, eliminating the need for separate DMRS configurations and reducing overall overhead.
2Measurement precision
If separate DMRS configurations are used for control and data channels, then channel-specific demodulation is ensured, but frequency spectrum utilization rate decreases
Solution Approach 1:
The patent merges the resource allocation for control and data channel DMRS into a shared configuration, allowing the same time-frequency resources to be utilized by both PSCCH and PSSCH for their respective demodulation needs, thereby improving spectrum utilization while maintaining channel-specific demodulation capability through the shared reference signal.
Solution Approach 2:
The patent introduces time-division multiplexing as an additional dimension for resource allocation. By mapping control information, data, and shared DMRS onto different time symbols within the same time unit, the system achieves both channel-specific demodulation and improved spectrum utilization by efficiently packing multiple signals in the time domain.
3Ease of operation
If control and data channels are transmitted separately, then signal processing is simplified, but transmission efficiency decreases
Solution Approach 1:
The patent implements dynamic resource allocation where control information and data can be flexibly mapped onto different time symbols within the same time unit based on traffic requirements. This dynamic approach allows the system to adapt to varying transmission needs while maintaining the shared DMRS structure, achieving both processing efficiency and transmission optimization.
Solution Approach 2:
By using time-division multiplexing to map control information, data, and shared DMRS onto different time symbols within the same time unit, the system ensures continuous utilization of available resources. This approach eliminates idle time slots and maintains continuous transmission activity, thereby improving overall transmission efficiency while keeping the shared DMRS configuration intact.
Data Source
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AI summary
The present invention provides sidelink-based transmission methods and apparatuses. A method includes: configuring a demodulation reference signal shared by control information and target data, where the target data indicates to-be-transmitted data associated with the control information; mapping the control information, the target data, and the demodulation reference signal onto a current time unit by using time-division multiplexing; and transmitting the control information, the target data, and the demodulation reference signal to a receiver through the time unit. The present invention reduces an overhead on demodulation reference signal and improves a utilization rate of frequency spectrum, Therefore, it succeeds in transmitting the control information, the target data, and the demodulation reference signal on the basis of time-division multiplexing in a sidelink communication system.