Interference Parameter Signaling in Downlink Control Information
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Solution Overview
Problem
In LTE cellular communication systems, efficiently obtaining and transmitting interference parameters from a serving node to a receiving device is challenging, particularly for effective interference suppression and cancellation, as existing methods require additional signaling overhead and complex blind detection processes.
Innovation Solution
The solution involves providing interference parameters within the downlink control information (DCI) using L1 signaling from the serving eNB to the UE, allowing the receiving device to estimate and mitigate interference from other transmitters, thereby reducing interference and improving signal quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If interference parameters are transmitted separately from downlink control information, then interference cancellation capability is improved, but control signaling overhead increases
Solution Approach 1:
The patent combines interference parameter transmission with downlink control information by embedding the interference parameter indicator within the DCI structure. This merging approach allows the UE to obtain both scheduling information and interference parameters through a single DCI message, thereby improving interference cancellation capability while avoiding additional control signaling overhead.
2Loss of information
If blind detection processes are used to obtain interference parameters, then interference information can be acquired, but implementation complexity increases
Solution Approach 1:
The patent introduces an intermediary approach where the serving eNB acts as a mediator that provides interference parameter indicators to the UE through DCI. Instead of requiring the UE to perform complex blind detection of interference parameters from multiple possible sources, the eNB directly indicates the relevant interference parameters, significantly reducing UE implementation complexity while ensuring accurate interference information acquisition.
3Reliability
If interference parameters are always transmitted, then interference suppression performance is improved, but control overhead increases continuously
Solution Approach 1:
The patent implements a dynamic approach where interference parameters are transmitted selectively based on current channel conditions and interference scenarios. The serving eNB determines whether to include interference parameter indicators in DCI messages based on whether interference cancellation would be beneficial for the UE, allowing the system to adapt control overhead to actual needs rather than continuously transmitting interference parameters.
Data Source
AI summary
The present invention relates to transmission and reception of downlink control information in a communication system. In particular, a serving base station transmits to a terminal a downlink control information which includes a first field with a scheduling information and a second field with interference parameters (interference information). The receiver employs the interference parameters for interference estimation used in interference cancellation or suppression.