D2D Relay Rate Control via UE Feedback
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Solution Overview
Problem
D2D based relay communication in wireless systems lacks efficiency due to a fixed number of retransmissions and open loop power control without feedback from user equipment (UE), leading to suboptimal performance in adjusting transmission parameters.
Innovation Solution
Implementing a method where a first UE receives feedback on a signal from a second UE through a D2D communication channel, allowing it to adjust transmission parameters such as the number of retransmissions, transmit power, or modulation and coding scheme based on the received feedback.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If D2D relay communication uses fixed number of retransmissions and open loop power control, then the system structure is simple, but the communication efficiency and performance are suboptimal
Solution Approach 1:
The patent implements closed-loop feedback mechanisms where the receiving UE sends feedback information about signal quality and channel conditions to the transmitting UE. This feedback enables dynamic adjustment of transmission parameters including number of retransmissions and transmit power, transforming the system from open-loop to closed-loop operation. The feedback principle resolves the contradiction by introducing controlled complexity through feedback mechanisms that significantly improve communication efficiency and reliability.
Solution Approach 2:
The patent transitions from static, fixed transmission parameters to dynamic, adaptive parameters. The number of retransmissions is no longer fixed but adjusts based on actual channel conditions and feedback information. Similarly, transmit power is dynamically adjusted rather than using fixed open-loop control. This dynamic adaptation allows the system to optimize performance for each transmission scenario, resolving the contradiction between simplicity and efficiency.
2Reliability
If D2D relay communication uses fixed number of retransmissions, then the control mechanism is simple, but the transmission reliability is suboptimal
Solution Approach 1:
The feedback mechanism enables the transmitting UE to adjust the number of retransmissions based on actual reception quality indicators from the receiving UE. This dynamic adjustment ensures optimal reliability by increasing retransmissions when channel conditions deteriorate and reducing them when conditions improve, resolving the contradiction between simple fixed control and reliable adaptive transmission.
Solution Approach 2:
The patent changes the transmission parameter of retransmission count from a fixed value to a variable parameter that adapts to channel conditions. By implementing feedback-based parameter adjustment, the system achieves higher reliability without excessive control complexity, as the parameter changes are driven by measurable signal quality metrics.
3Use of energy by moving object
If D2D relay communication uses open loop power control, then the power control mechanism is simple, but the power efficiency is suboptimal
Solution Approach 1:
The patent implements feedback-based power control where the receiving UE provides information about received signal strength and channel conditions to the transmitting UE. This feedback enables the transmitter to adjust its power output dynamically, increasing power efficiency by transmitting at higher powers only when necessary and reducing power when channel conditions are good, thereby resolving the contradiction between simple open-loop control and efficient closed-loop power management.
Solution Approach 2:
The power control mechanism transitions from static open-loop to dynamic closed-loop operation. The transmitting power is continuously adjusted based on real-time feedback about channel conditions, allowing the system to optimize power efficiency for each transmission scenario. This dynamic approach resolves the contradiction by introducing controlled complexity that significantly improves energy utilization.
4Productivity
If D2D relay communication does not use feedback from UE, then the system is simpler to implement, but the performance optimization is limited
Solution Approach 1:
The patent introduces feedback mechanisms that enable UEs to report channel conditions, signal quality, and reception status back to the transmitting UE. This feedback loop allows for performance optimization by adjusting transmission parameters based on actual system conditions. The feedback principle resolves the contradiction by implementing targeted feedback only for critical parameters, achieving performance improvement with manageable complexity.
Data Source
AI summary
In one aspect of the disclosure, to improve the performance of device-to-device based relay communication, a method, a computer-readable medium, and an apparatus for performing rate control based on feedback from participating UEs are provided. The apparatus may be a first UE. The first UE may receive a signal from a second UE through a device-to-device communication channel. The first UE may determine a feedback based on the received signal. The first UE may transmit the feedback to adjust transmission of the signal at the second UE. In another aspect of the disclosure, a first UE may transmit a signal to a second UE through a device-to-device communication channel. The first UE may receive a feedback of the signal. The first UE may adjust transmission of the signal based on the feedback.