Unlicensed Band C-V2X Side Link Control Information Format Design
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Solution Overview
Problem
Current C-V2X communication systems face challenges in ensuring data integrity and reliability, particularly in the unlicensed band, due to the lack of defined side link control information formats, which can lead to communication errors and reliability drops when external obstacles interfere.
Innovation Solution
The implementation of a method that allows user equipment to transmit and receive side link control information in the unlicensed band using distinct formats for physical side link control and shared channels, enabling identification of channel access, feedback requests, and channel occupancy information to maintain communication reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If unlicensed band is used for C-V2X communication to increase spectrum availability, then communication capacity is improved, but communication reliability deteriorates due to external obstacles and interference
Solution Approach 1:
The SCI information is segmented into two distinct formats: first SCI format for control information transmission on PSCCH, and second SCI format for data transmission on PSSCH. This segmentation allows tailored optimization of each channel's information structure for its specific function, improving overall reliability in unlicensed band operations
Solution Approach 2:
Different SCI formats use different parameter configurations and field structures. The first SCI format includes parameters specific to control channel operation, while the second SCI format includes parameters optimized for shared channel data transmission, adapting the information structure to match the operational requirements of each channel
2Ease of operation
If DCI format is set for unlicensed band but SCI format is not set, then downlink control is enabled, but side link control information transmission cannot be performed
Solution Approach 1:
The SCI format design provides multi-functionality by enabling both downlink control operations and side link control operations within the same unlicensed band framework. The standardized SCI formats can be universally applied across different transmission scenarios, making the system versatile for both DCI and SCI requirements
3Device complexity
If single SCI format is used for both control and shared channels, then system complexity is reduced, but communication accuracy deteriorates due to insufficient information differentiation
Solution Approach 1:
Different SCI formats are designed with local quality optimization: the first SCI format contains control-specific information fields appropriate for PSCCH operations, while the second SCI format contains data-specific information fields appropriate for PSSCH operations. Each format has tailored field structures that optimize the quality and precision of information transmission for its specific channel type
Data Source
AI summary
According to various embodiments, a first user equipment (UE) include a transceiver to transmit and receive a wireless signal; and a processor connected to the transceiver, wherein the processor is configured to receive first side link control information (SCI) from a second UE through a physical side link control channel (PSCCH) configured in unlicensed band, receive a second SCI from the second UE through a physical side link shared channel (PSSCH) determined based on the PSCCH, wherein the first SCI and the second SCI are configured in different formats, based on at least one of the first SCI and the second SCI, identify information for performing side link communication with the second UE in the unlicensed band, and receive, based on the identified information, data from the second UE through a side link communication path between the first UE and the second UE.