D2D Relay Priority Indication for Efficient Data Transmission
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Solution Overview
Problem
Current D2D communication systems lack an effective method for indicating priority for relay data, which is essential for efficient data transmission between User Equipments (UEs) in proximity-based services.
Innovation Solution
A method where a remote UE adds priority information to packets and transmits them along with the packets over the PC5 interface, allowing the Relay UE to prioritize data transmission accordingly, ensuring higher priority packets are relayed effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If D2D communication is implemented without priority indication for relay data, then the system structure remains simple, but data transmission efficiency and reliability deteriorate due to inability to prioritize different data types
Solution Approach 1:
The patent segments the data transmission process by introducing priority levels (first priority and second priority) for different data types. Remote UE segments data into priority-based groups before transmission, and Relay UE segments reception and forwarding based on priority. This segmentation enables efficient prioritization without requiring complete protocol redesign, thus improving data transmission efficiency while controlling complexity increase.
Solution Approach 2:
The patent applies preliminary action by having Remote UE add priority information to data packets before transmission over the PC5 interface. The priority indication is prepared in advance during data segmentation and transmission, allowing Relay UE to immediately prioritize forwarding without complex real-time analysis. This preliminary tagging simplifies the overall system complexity while enabling efficient priority-based transmission.
2Reliability
If priority information is added to each data packet for relay transmission, then data transmission reliability improves, but the amount of data to be transmitted and processed increases
Solution Approach 1:
The patent applies partial action by adding priority indication information selectively to data packets rather than embedding complete quality parameters or extensive metadata. The priority indication is a compact field that provides sufficient reliability information for prioritization without excessively increasing data volume. This partial information approach achieves reliable priority-based transmission while minimizing overhead.
3Productivity
If multiple UEs transmit data with the same resources in D2D communication, then resource utilization improves, but conflict and interference increase without priority-based scheduling
Solution Approach 1:
The patent changes the parameter of data packets by adding priority indication information that transforms identical resource transmissions into differentiated priority-based transmissions. This parameter change enables the system to utilize the same time-frequency resources for multiple UEs while using priority levels to manage and resolve potential conflicts, thus improving resource utilization while controlling interference through priority-aware scheduling at the Relay UE.
Data Source
Figure 1~2A
Figure 2B
Figure 3(a)~4
AI summary
The present invention relates to a wireless communication system. More specifically, the present invention relates to a method and a device for indicating a priority in a D2D communication system, the method comprising: receiving a SDU with a priority corresponding to the SDU from an upper layer; generating a PDU including the SDU and the corresponding priority; and transmitting the PDU to a peer device.