D2D Transmission Scheduling With Base-Station Feedback Retransmission
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In D2D communication, poor network quality can lead to unreliable data transmission between UEs due to the base station's inability to perceive the receiving status of the second UE, resulting in inadequate resource allocation for retransmissions.
Innovation Solution
A method where a base station sends scheduling information to a first UE, which receives feedback on the second UE's data reception status, allowing the base station to assign retransmission resources accordingly, enhancing data transmission reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If D2D direct communication is implemented without base station forwarding, then communication efficiency is improved, but transmission reliability deteriorates due to inability to perceive receiving status
Solution Approach 1:
The patent implements a feedback mechanism where the second UE sends reception status feedback to the base station, which then forwards this information to the first UE. This allows the transmitting UE to know whether the data was successfully received without requiring direct UE-to-UE feedback channels, thus maintaining reliability while preserving D2D communication efficiency.
Solution Approach 2:
The base station acts as an intermediary that receives feedback from the second UE and forwards this reception status information to the first UE. This intermediary role allows the system to maintain direct UE-to-UE data transmission (improving efficiency) while using the base station to bridge the information gap about reception status (maintaining reliability).
2Reliability
If base station assigns retransmission resources based on feedback, then transmission reliability is improved, but system complexity increases
Solution Approach 1:
The system uses existing base station functions for resource allocation and feedback forwarding without requiring new dedicated mechanisms. The base station leverages its existing capability to manage uplink feedback channels and downlink data transmission to also handle D2D reception status feedback, thus improving reliability without proportionally increasing system complexity.
3Reliability
If feedback mechanism is implemented for D2D communication, then transmission reliability is improved, but signaling overhead increases
Solution Approach 1:
The base station utilizes existing uplink feedback channels and processing mechanisms to carry and process D2D reception status information. By making these existing structures multi-functional (handling both traditional uplink feedback and D2D feedback), the system achieves improved reliability without adding dedicated feedback channels that would increase signaling overhead.
Data Source
Figure 1~2
Figure 3~4
Figure 5
AI summary
Embodiments of this application disclose a data transmission method, including: sending (201), by a base station, first scheduling information to first UE, where the first scheduling information is used to instruct the first UE to send data to second UE based on the first scheduling information; receiving (203), by the base station, first feedback information sent by the first UE, where the first feedback information is used to indicate whether the second UE successfully receives the data; and sending (204), by the base station, second scheduling information to the first UE if the first feedback information indicates that the second UE fails to receive the data, where the second scheduling information is used to instruct the first UE to resend the data to the second UE. The embodiments of this application further provide a base station, UE, and a data transmission system. In the embodiments of this application, the first UE may perceive a data receiving status of the second UE by receiving the first feedback information, so that a corresponding resource can be assigned again for data retransmission, thereby improving reliability of data transmission between the two UEs.