Cross-Subframe Control for Wireless Interference Mitigation
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Solution Overview
Problem
Wireless communication networks face significant performance degradation due to dominant interference scenarios, where user equipment (UE) or base stations experience high interference, leading to degraded data transmission quality.
Innovation Solution
The implementation of cross-subframe control and interference mitigation techniques, such as TDM and FDM partitioning of control resources, and the use of physical downlink control channel (PDCCH) messages to manage and reduce interference, allowing for efficient data transmission even in high-interference environments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If different base stations transmit control information in the same subframe, then resource utilization is efficient, but interference between base stations increases and performance degrades
Solution Approach 1:
The patent segments the time domain by allocating different subframes to different base stations for control information transmission. Specifically, first base stations transmit control information in first subframes while second base stations transmit control information in second subframes, thereby separating the transmission resources and reducing inter-base station interference.
2Reliability
If control information is transmitted in every subframe, then communication reliability is high, but interference impact increases and network performance degrades
Solution Approach 1:
The patent implements periodic control information transmission where base stations transmit control information in periodically occurring subframes rather than every subframe. This periodic transmission reduces the overall interference impact while maintaining adequate communication reliability through the periodic nature of the transmissions.
3Productivity
If control information and data are transmitted in the same subframe, then transmission efficiency is high, but interference from control signals degrades data transmission quality
Solution Approach 1:
The patent segments the subframe structure by allocating specific regions within subframes for control information and other regions for data transmission. This segmentation allows control information to be transmitted in dedicated control regions while data is transmitted in data regions, reducing mutual interference while maintaining transmission efficiency.
Data Source
AI summary
Techniques for supporting communication in dominant interference scenarios are described. In an aspect, communication in a dominant interference scenario may be supported with cross-subframe control. Different base stations may be allocated different subframes for sending control information. Each base station may send control messages in the subframes allocated to that base station. Different base stations may have different timelines for sending control messages due to their different allocated subframes. With cross-subframe control, control information (e.g., grants, acknowledgement, etc.) may be sent in a first subframe and may be applicable for data transmission in a second subframe, which may be a variable number of subframes from the first subframe. In another aspect, messages to mitigate interference may be sent on a physical downlink control channel (PDCCH).