Interference Cancellation via Device-to-Device Link Exchange
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Solution Overview
Problem
Current wireless communication systems face inefficiencies in radio resource utilization due to downlink interference, as they often require assigning different radio frequency resources to different users, limiting spectral efficiency.
Innovation Solution
The implementation of device-to-device (D2D) links between user equipments (UEs) to facilitate interference cancellation by exchanging soft or hard information, allowing multiple UEs to receive downlink transmissions over the same radio resources, thereby enabling coordinated interference cancellation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If different radio frequency resources are assigned to different users to avoid interference, then interference mitigation is improved, but radio resource utilization efficiency deteriorates
Solution Approach 1:
The patent converts the harmful downlink interference into a beneficial opportunity for interference cancellation. By having UEs exchange information over D2D links about their received signals, UEs can cancel the interference component and decode messages from the other UE, thereby turning interference into a useful resource for improving spectral efficiency
Solution Approach 2:
The patent introduces D2D links as intermediary communication channels between UEs. These D2D links serve as mediators that enable information exchange about received signals, allowing UEs to coordinate interference cancellation without requiring additional downlink resources from the base station
2Productivity
If multiple UEs receive downlink transmissions over the same radio resources, then spectral efficiency is improved, but downlink interference increases
Solution Approach 1:
The patent applies interference cancellation techniques where UEs use information exchanged over D2D links to identify and cancel the interference component caused by simultaneous transmissions. This converts the harmful interference into a manageable signal that can be removed, allowing multiple UEs to share radio resources efficiently
Solution Approach 2:
The patent implements a feedback mechanism where UEs exchange information about their received downlink signals over D2D links. This feedback loop enables each UE to understand the interference structure and adjust its reception accordingly, facilitating coordinated interference cancellation and improving spectral efficiency
Data Source
AI summary
Soft information for achieving interference cancellation in downlink transmissions can be communicated over device-to-device (D2D) links, thereby allowing paired user equipments (UEs) to receive downlink transmissions over the same radio resources. More specifically, paired UEs that receive transmissions over the same time-frequency resources may exchange soft or hard information over D2D links in order to facilitate interference cancellation. The D2D links may be unidirectional or bidirectional, and may be established over in-band or out-of-band resources. Paired UEs may be in the same or different cells, and may receive their respective transmissions from the same or different transmit point. UEs may be paired with one another based on various criteria, e.g., interference cancellation capabilities, scheduling metrics, etc.