FDR Self-Interference Mitigation via Overlap Region Segmentation
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Solution Overview
Problem
In FDR communication environments, self-interference generated by simultaneous transmission and reception using the same time-frequency resources hinders communication performance, and existing methods are inefficient in mitigating this interference effectively.
Innovation Solution
A method where a base station sets an overlap region for downlink control channels based on priority and self-interference cancellation capacity, transmitting information about this region to UEs to minimize self-interference, allowing UEs to adjust their uplink data channel transmission and mitigate interference accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If FDR communication is implemented to improve resource utilization efficiency, then productivity increases, but self-interference is generated that degrades communication reliability
Solution Approach 1:
The patent segments the time-frequency resource grid into distinct regions: overlap regions where self-interference occurs and non-overlap regions where it does not. This segmentation allows the system to identify and handle interfering signals separately, enabling reliable detection of downlink control channels even in FDR mode by confining self-interference to specific segmented regions.
Solution Approach 2:
The patent applies local quality by treating different regions of the resource grid differently. Overlap regions are identified and handled with specific self-interference mitigation techniques, while non-overlap regions are processed normally. This localized approach allows FDR communication to proceed with maintained reliability by applying interference cancellation only where necessary.
2Reliability
If self-interference cancellation is performed to improve communication reliability, then reliability increases, but device complexity increases due to additional processing requirements
Solution Approach 1:
The patent performs preliminary action by identifying and marking overlap regions in advance before actual downlink control channel detection. The base station预先 determines which resource elements will experience self-interference and communicates this information to the UE. This preliminary identification simplifies subsequent detection by allowing the UE to focus cancellation efforts only on predetermined problematic regions rather than processing the entire signal.
Solution Approach 2:
The patent extracts the self-interference component by separately identifying the uplink signal that causes interference in the overlap regions. The UE extracts this interfering component and subtracts it from the received signal, leaving the clean downlink control channel signal for detection. This extraction approach isolates the interference problem from the overall reception process, reducing complexity.
3Reliability
If overlap region information is provided to UEs to enable self-interference mitigation, then reliability improves, but loss of information increases due to additional signaling overhead
Solution Approach 1:
The patent applies partial action by providing overlap region information only for the specific downlink control channels that are actually transmitted, rather than providing information for all possible channels. The base station identifies which control channels will be sent and provides overlap region information only for those channels, reducing signaling overhead while still enabling reliable mitigation for the actual transmissions.
Data Source
AI summary
Disclosed are a method and a base station for mitigating self-interference in which, in a resource region for transmitting a plurality of downlink control channels, an overlap region is configured, the overlap region being a resource region from which the effects of self-interference due to an uplink communication of a terminal must be removed, and the information regarding the overlap region is transmitted to a terminal connected to a base station and communicating via FDR.