V2X Scheduling Assignment Signal Measurement Accuracy
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Solution Overview
Problem
In V2X communications, the existing D2D broadcast communication mechanisms face challenges with high-speed devices, such as vehicles, where inter-subcarrier interferences and in-band leakage interference occur due to high-speed and high-carrier frequency, leading to performance issues in receiving SA signals and resource conflicts.
Innovation Solution
A method that enhances the accuracy of measuring received power for SA signals by using multiple DMRS sequences based on device identity, resource pool ID, device type, subframe index, and priority, allowing for improved channel estimation and resource selection to avoid collisions and interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single DMRS sequence is used for channel estimation, then the system complexity is low, but the measurement accuracy of received power for SA signals deteriorates due to inter-subcarrier interferences and in-band leakage interference in high-speed V2X communications
Solution Approach 1:
The patent segments the single DMRS sequence into multiple DMRS sequences (first DMRS sequence and second DMRS sequence) that are transmitted on different resources. This segmentation allows for more accurate channel estimation by providing multiple independent measurement opportunities, thereby improving the measurement accuracy of received power for SA signals while managing system complexity through structured resource allocation
Solution Approach 2:
The patent applies local quality by using different DMRS sequences with distinct properties (different root indices, cyclic shifts, or orthogonal cover codes) for different transmission resources. This local differentiation optimizes channel estimation accuracy for specific high-speed V2X communication scenarios without requiring complete system redesign
2Reliability
If resource selection is performed without accurate RSRP measurement, then the resource selection process is simple, but resource conflicts and collisions increase among high-speed devices
Solution Approach 1:
The patent implements a feedback mechanism where the measured RSRP values from multiple DMRS sequences are fed back into the resource selection process. This feedback loop enables more reliable resource selection by providing accurate information about channel conditions and interference levels, thereby reducing resource conflicts and collisions among high-speed devices
Solution Approach 2:
The patent performs preliminary RSRP measurements using multiple DMRS sequences before final resource selection. This preliminary action allows the system to identify suitable resources with minimal interference in advance, improving resource selection reliability while managing complexity through structured measurement and selection procedures
Data Source
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AI summary
The present disclosure discloses a method for transmitting data, including the following blocks. A first device senses scheduling assignment (SA) and received power of a second device, and a total received energy of each subband; the first device determines a reference value of received power of the second device and a reference value of total received energy, based on a sensing result of the second device; the first device selects a resource, based on the reference value of received power and reference value of total received energy; the first device transmits data. By adopting the method of the present disclosure, decoding performance of SA is improved, and accuracy for measuring received power of the SA is also enhanced. Subsequently, on the basis of SA and received power, performances for selecting/re-selecting channel resources are improved.