Sidelink Control Information MCS Change for V2X Retransmission
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Solution Overview
Problem
Current sidelink communication systems in 5G and 4G networks lack an efficient method for retransmitting data, particularly in Vehicle-to-Everything (V2X) communications, where hybrid automatic repeat request (HARQ) feedback is necessary for reliable data transmission.
Innovation Solution
The proposed solution involves generating and transmitting sidelink control information (SCI) that includes modulation and coding scheme (MCS) change information, as well as information elements for retransmissions and blind retransmissions, to manage the retransmission of sidelink data without immediate HARQ response, allowing for efficient data transmission and reception based on predetermined retransmission schedules.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If retransmission of sidelink data is implemented without immediate HARQ feedback, then reliability of data transmission is improved, but device complexity increases due to need for MCS change information and retransmission scheduling mechanisms
Solution Approach 1:
The patent applies preliminary action by including MCS change information and retransmission scheduling parameters in the initial SCI transmission. The transmitting terminal pre-configures the receiving terminal with modulation and coding scheme changes and retransmission timing information before actual retransmission occurs, eliminating the need for immediate HARQ feedback while maintaining reliable data delivery through advance planning of transmission parameters
Solution Approach 2:
The patent implements parameter changes by dynamically modifying MCS parameters and retransmission scheduling parameters embedded in SCI. The transmitting terminal changes modulation order, coding rate, and resource allocation parameters for retransmissions based on channel conditions and traffic requirements, allowing flexible adaptation without immediate feedback loops
2Productivity
If MCS change information is included in SCI for retransmission, then transmission efficiency is improved through adaptive modulation and coding, but information overhead in control channels increases
Solution Approach 1:
The patent applies universality by designing SCI to serve multiple functions simultaneously: it carries initial data transmission information, MCS change indicators, retransmission scheduling parameters, and resource allocation details all in a single control message structure. This multi-functional approach improves transmission efficiency while minimizing the number of separate control transmissions required
Solution Approach 2:
The patent uses parameter changes by encoding MCS information in a compact form within SCI, utilizing bit-field representations and differential encoding techniques. The MCS change information is transmitted as parameter modifications rather than full parameter sets, reducing control channel overhead while maintaining the ability to adapt modulation and coding schemes for efficient retransmission
Data Source
AI summary
Disclosed are a method and device for transmitting and receiving sidelink data in a communication system. An operation method of a first terminal comprises the steps of: generating first SCI including MCS change information indicating whether to change an MCS used for sidelink communication; transmitting the first SCI to a second terminal on a PSCCH; performing a coding operation and a modulation operation on first data on the basis of the MCS determined by the MCS change information; and transmitting the first data to the second terminal on a PSSCH.