NR V2X Resource Mapping for Variable-Length Control Information
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Solution Overview
Problem
The existing resource mapping manner in LTE V2X communication is not applicable to NR V2X due to variable control information lengths, leading to inefficiencies and increased overheads in control channels.
Innovation Solution
A communication method where first control information is mapped to a first transmission resource, and second information including data and second control information is mapped to non-overlapping second and third transmission resources within the same scheduling unit, with the second control information positioned at the forefront to enhance reliability and reduce decoding delay.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the existing LTE V2X resource mapping manner is used, then the control channel structure is simple and fixed, but it cannot support variable length control information in NR V2X, leading to increased overheads and reduced efficiency
Solution Approach 1:
The control information is divided into two parts: first control information mapped to a first transmission resource, and second control information mapped to a second transmission resource. This segmentation allows each part to be transmitted independently on appropriately sized resources, enabling support for variable length control information while minimizing total overhead by avoiding the need to allocate resources for the maximum possible length of the entire control information block.
2Reliability
If control information is transmitted with standard power allocation, then resource allocation is simple, but reliability of control information transmission is insufficient
Solution Approach 1:
Different transmit powers are allocated to different parts of the control information based on their specific requirements. The first control information and second control information can be transmitted with different power levels optimized for their respective channels and importance, improving overall reliability without requiring complex system-wide power allocation schemes.
3Loss of time
If control information is transmitted without prioritization, then transmission process is simple, but decoding delay increases due to variable length
Solution Approach 1:
The second control information is positioned at the forepart (beginning) of the second information before data transmission. This preliminary positioning allows the receiver to decode the second control information first, which contains necessary parameters for subsequent data decoding, thereby reducing overall decoding delay without requiring complex dynamic scheduling mechanisms.
Data Source
AI summary
A communication method and apparatus are provided, and are applicable to fields such as V2X, internet of vehicles, intelligent connected vehicles, assisted driving, and intelligent driving. The method includes: A first terminal device may map first control information to a first transmission resource, and map second information including second control information and data to a second transmission resource and a third transmission resource, and may map the second information to the second transmission resource that does not overlap the first transmission resource in time domain.