NR V2X Relay UE MAC PDU Priority Selection for Uplink Data
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Solution Overview
Problem
Conventional NR V2X communication systems lack a method to determine transmission priorities for relay data and uplink data in a relay UE, leading to situations where only one of the two can be transmitted, especially in relay communication environments.
Innovation Solution
A method is proposed for a relay UE to determine transmission priorities by comparing the priority of relay data with uplink data and transmitting the uplink MAC PDU with the lower priority value first, using direct comparison or conversion methods to assign higher priority to data with smaller priority values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a relay UE transmits both relay data and uplink data simultaneously, then the transmission capacity is improved, but the system complexity increases because conventional NR V2X systems do not support simultaneous transmission of relay data and uplink data on the same uplink MAC PDU
Solution Approach 1:
The patent merges relay data and uplink data into a single uplink MAC PDU for simultaneous transmission. The MAC layer constructs one MAC PDU that contains both relay data (from remote UEs) and uplink data (from the relay UE itself), allowing both data types to be transmitted together through the same physical uplink shared channel resources, thereby improving transmission capacity without requiring separate transmission channels.
Solution Approach 2:
The uplink MAC PDU is designed to serve multiple functions simultaneously: it carries both relay data (forwarding traffic for remote UEs) and uplink data (local traffic from the relay UE). This multi-functional MAC PDU structure allows the relay UE to efficiently utilize uplink resources for both relay operations and local communications, reducing system complexity by avoiding separate transmission procedures.
2Device complexity
If only one type of data (relay data or uplink data) is transmitted in the uplink MAC PDU, then the transmission protocol is simplified, but the data transmission completeness deteriorates because critical high-priority data may be lost when resources are insufficient
Solution Approach 1:
The patent introduces priority parameters (priority values) for different data types and uses these parameters to determine data inclusion in the uplink MAC PDU. By comparing priority values of relay data and uplink data, the system dynamically decides which data to transmit when resources are limited, ensuring that high-priority critical data is transmitted while maintaining protocol simplicity through standardized priority comparison rules.
Solution Approach 2:
The patent implements a feedback mechanism where the MAC layer evaluates the priority of both relay data and uplink data before constructing the uplink MAC PDU. This feedback-based priority assessment ensures that when uplink resources are insufficient, the system automatically prioritizes critical high-priority data for transmission, thereby maintaining data transmission completeness without complex protocol modifications.
3Reliability
If the relay UE prioritizes transmission of high-priority data, then the transmission reliability is improved, but the transmission time increases due to the need for priority comparison and selection processes
Solution Approach 1:
The patent applies preliminary action by pre-assigning priority values to different data types before transmission. The MAC layer pre-configures priority information for relay data and uplink data, so that when transmission decisions need to be made, the system can quickly compare pre-established priority values without complex real-time analysis, thereby reducing the time penalty associated with priority-based selection while maintaining high transmission reliability.
Data Source
AI summary
Proposed is a method of operating a first device (100) in a wireless communication system. The method may comprise the steps of: receiving, through a physical sidelink control channel (PSCCH), first SCI for scheduling a physical sidelink shared channel (PSSCH) and second sidelink control information (SCI) from a second device (200); receiving, through the PSSCH related to the PSCCH, the second SCI and first data from the second device (200); and transmitting, on the basis of a value related to an uplink (UL) priority of the first data and a value related to a UL priority of second data, the first data or the second data to a base station (300) through a physical uplink shared channel (PUSCH).