UL MAC CE Priority Handling in LTE V2X Terminals
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Solution Overview
Problem
In LTE V2X communication, when uplink (UL) and sidelink (SL) transmissions conflict, the existing priority determination method based solely on sidelink MAC PDU priority fails to ensure preferential transmission of higher-priority services, leading to inefficiencies in communication.
Innovation Solution
A terminal device obtains configuration information indicating uplink MAC control elements (CE) to determine whether the UL MAC PDU includes specific CEs, allowing it to prioritize UL or SL transmissions accordingly, ensuring higher-priority data is transmitted first.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If sending priorities of UL and SL are determined based on only a priority of SL MAC PDU, then the determination process is simple, but UL transmission cannot be preferentially performed even though a service having a higher priority exists on the UL
Solution Approach 1:
The patent changes the parameters used for priority determination from only SL MAC PDU priority to a comprehensive set including UL service priority, SL service priority, and UL MAC CE type. This allows the system to accurately reflect actual communication requirements while maintaining a systematic determination process.
Solution Approach 2:
The patent segments the priority determination into distinct cases: when UL MAC PDU contains specified MAC CEs (requiring preferential UL transmission), when it contains emergency calls or random access (highest priority), and normal priority comparison based on service priorities. This segmentation enables precise handling of different transmission scenarios.
2Device complexity
If sending priorities are determined based only on SL MAC PDU priority, then the determination criteria are limited, but this fails to comprehensively consider actual communication requirements of both UL and SL links
Solution Approach 1:
The patent introduces multiple parameters for comprehensive priority determination: UL service priority (first priority information), SL service priority (second priority information), and UL MAC CE type indicators. These parameters enable the system to comprehensively evaluate actual communication requirements of both links.
Solution Approach 2:
The patent implements dynamic priority determination that adapts to different transmission scenarios. The determination method changes based on the content of UL MAC PDU (whether it contains specified MAC CEs, emergency calls, or normal data), allowing flexible and context-appropriate priority assignment that improves communication efficiency.
Data Source
AI summary
A terminal device obtains first configuration information, where the first configuration information includes indication information of a UL MAC CE. Then, the terminal device preferentially sends a UL MAC PDU or an SL MAC PDU based on the indication information, where the UL MAC PDU can be used to transmit the UL MAC CE.