MAC PDU Transmission Threshold for D2D Sidelink Grants
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Solution Overview
Problem
Current D2D communication systems face challenges in efficiently transmitting MAC PDU data without padding, especially when sidelink grants are insufficient, leading to suboptimal data transmission and resource utilization.
Innovation Solution
Implementing a method where User Equipment (UE) only transmits a MAC PDU with padding if the sidelink grant is larger than a certain threshold, ensuring that the minimum required headers and data are included, thereby avoiding transmission of padding-only MAC PDUs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the UE transmits MAC PDU with padding when sidelink grant is insufficient, then the transmission resource is fully utilized, but the data transmission efficiency deteriorates due to unnecessary padding
Solution Approach 1:
The patent introduces a threshold parameter for sidelink grant size and changes the transmission behavior based on whether the grant exceeds this threshold. When the sidelink grant is below the threshold, the UE skips MAC PDU transmission entirely rather than transmitting padding-filled PDUs, thereby improving data transmission efficiency by eliminating unnecessary transmissions while maintaining adequate resource utilization.
2Reliability
If the UE transmits MAC PDU with only padding, then the minimum transmission requirement is met, but the overall communication efficiency deteriorates
Solution Approach 1:
The patent extracts and removes the unnecessary padding transmission component from the MAC PDU transmission process. By identifying that padding-only transmissions do not contribute to meaningful data communication, the invention eliminates this wasteful practice entirely, thereby maintaining transmission reliability for actual data while dramatically improving communication efficiency by removing redundant transmissions.
3Device complexity
If the UE always transmits MAC PDU regardless of grant size, then the transmission protocol is simplified, but the resource utilization deteriorates due to padding transmissions
Solution Approach 1:
The patent introduces dynamic behavior to the MAC PDU transmission protocol based on the sidelink grant size relative to a threshold. Instead of a fixed transmission rule, the UE dynamically decides whether to transmit based on current resource allocation conditions. This dynamic approach adds minimal complexity (comparing grant size to threshold) while significantly improving resource utilization by avoiding padding transmissions when resources are insufficient.
Data Source
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Figure 2b
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AI summary
The present invention relates to a wireless communication system. More specifically, the present invention relates to a method and a device for avoiding padding only MAC PDU in a D2D communication system, the method comprising: receiving a sidelink grant from a base station (BS) when the TX UE communicates with a receiving UE (RX UE) directly; checking size of the received sidelink grant; and transmitting a Medium Access Control Protocol Data Unit (MAC PDU) including at least one byte of Radio Link Control Service Data Unit (RLC SDU) if the size of received sidelink grant is larger than a minimum size of MAC PDU including only MAC header and Radio Link Control (RLC) header for Sidelink Traffic Channel (STCH).