Sidelink Data Feedback for Energy Saving
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Solution Overview
Problem
In user cooperation scenarios, terminal devices with transmit power saving requirements cannot efficiently feed back decoding results, leading to unnecessary data retransmissions and waste of transmission resources.
Innovation Solution
A data feedback method where a first terminal receives feedback information from a second terminal indicating its receiving result for data sent by a network device, and then determines its own receiving result to send consolidated feedback information to the network device, thereby reducing power consumption and avoiding unnecessary retransmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the base station repeatedly sends data to the TUE until preset retransmission times are reached, then the TUE can potentially receive the data, but transmission resources are wasted due to unnecessary retransmissions
Solution Approach 1:
The CUE acts as an intermediary between the TUE and the base station. The CUE receives feedback information from the TUE via sidelink, determines the TUE's receiving result based on this feedback and its own decoding result, and then provides consolidated feedback to the base station. This intermediary mechanism allows the base station to accurately determine whether the TUE received data successfully without the TUE directly consuming power to send feedback, thus resolving the contradiction between reliability and energy saving.
2Loss of information
If the TUE sends feedback information to the base station, then the base station can determine the receiving result accurately, but the TUE consumes large amount of power
Solution Approach 1:
The CUE serves as a mediator that collects feedback information from the TUE through low-power sidelink communication and forwards it to the base station. The TUE only needs to send feedback to the CUE via sidelink rather than directly to the base station, significantly reducing its power consumption while still enabling the base station to obtain the necessary feedback information through the CUE's consolidation and forwarding.
Solution Approach 2:
The CUE merges the feedback information from the TUE with its own decoding result to form consolidated feedback. By combining these information sources, the CUE enables the base station to determine the TUE's receiving result without the TUE directly transmitting feedback to the base station, thus reducing the TUE's energy consumption while maintaining feedback functionality.
3Use of energy by moving object
If the TUE does not send feedback information to save power, then the TUE conserves energy, but the base station cannot determine the receiving result and must perform unnecessary retransmissions
Solution Approach 1:
The CUE acts as an intermediary that enables the TUE to save power by not directly transmitting feedback to the base station. The CUE receives the TUE's feedback information via sidelink, determines the receiving result by combining this feedback with its own decoding result, and provides consolidated feedback to the base station. This mechanism allows the TUE to conserve energy while the base station still obtains accurate receiving result information to avoid unnecessary retransmissions.
Solution Approach 2:
The system implements a feedback mechanism where the CUE provides consolidated feedback to the base station about the TUE's receiving result. This feedback loop enables the base station to make informed decisions about retransmissions based on the TUE's actual reception status, thereby improving transmission efficiency while allowing the TUE to save power by not directly sending feedback.
Data Source
AI summary
A data feedback method is described. The method includes a second terminal sending first feedback information to a first terminal based on a sidelink. The first terminal determines, based on a receiving result of the first terminal for first data and a receiving result that is of the second terminal and that is indicated by the first feedback information, second feedback information that is sent to a network device. In this way, an energy saving requirement of the second terminal is met. Moreover, the described method ensures the network device can also determine receiving results of the first terminal and the second terminal based on the second feedback information, thereby reducing unnecessary operations performed by the network device.