V2X Terminal ACK/NACK Feedback for Multicast Data
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Solution Overview
Problem
In wireless communication systems, particularly in V2X operations, the lack of ACK/NACK message transmission from UE for multicast data leads to excessive payload size issues for base stations, causing resource wastage and inefficiency in data retransmissions.
Innovation Solution
A method where V2X terminals transmit ACK/NACK messages for both unicast and multicast data, adjusting payload size, resource elements, and transmission power based on data reliability and priority, allowing for differentiated treatment of high and low-priority data, and potentially delaying or dropping low-priority transmissions to optimize resource usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the base station transmits multicast data to multiple V2X terminals without receiving ACK/NACK feedback, then the coverage and reach of multicast communication is improved, but the payload size becomes excessively large and resource wastage increases
Solution Approach 1:
The patent implements ACK/NACK feedback mechanism where V2X terminals send acknowledgment messages to the base station for received multicast data. This feedback allows the base station to determine which terminals successfully received the data and which need retransmission, thereby reducing the payload size needed for retransmissions and optimizing resource usage.
2Area of stationary object
If the base station transmits data to all terminals within coverage, then the service coverage is maximized, but the transmission efficiency decreases due to excessive payload size
Solution Approach 1:
The patent segments the multicast group into terminals that have successfully received data and terminals that need retransmission. By using ACK/NACK feedback, the base station can identify and separately handle different terminal groups, transmitting retransmission data only to terminals that need it, thereby improving transmission efficiency while maintaining service coverage.
3Reliability
If ACK/NACK messages are transmitted for all data types, then the reliability of data reception is improved, but the resource consumption and transmission overhead increase
Solution Approach 1:
The patent applies different ACK/NACK transmission strategies based on the local characteristics of different data types and terminal priorities. High-priority terminals and critical data receive full ACK/NACK feedback for maximum reliability, while low-priority data may use reduced feedback mechanisms, thereby optimizing resource consumption while maintaining necessary reliability levels.
Data Source
AI summary
The present invention relates to a Vehicle-to-X (V2X) operation method performed by a V2X terminal in a wireless communication system. Provided is the method comprising: receiving, from a base station, unicast data and multicast data, and transmitting, to the base station, an acknowledgment (ACK)/negative acknowledgement (NACK) for the unicast data and ACK/NACK for the multicast data, wherein the unicast data is data for the V2X terminal and the multicast data is data for a plurality of V2X terminals comprising the V2X terminal.