Cross-Subframe Control Signaling for Wireless Interference Reduction
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Solution Overview
Problem
Wireless communication networks face interference issues that affect the reliability of control information transmission, particularly due to strong interference from neighboring cells, which complicates the decoding of control channels and data channels in shared subframes.
Innovation Solution
Implementing cross-subframe signaling and window-based decoding techniques, where control information is transmitted in a subframe with less interference, allowing user equipment (UE) to decode the control channel in a designated or windowed timeframe and subsequently decode the data channel based on the obtained control information, thereby improving reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If control information and data are transmitted in the same subframe, then transmission efficiency is improved, but transmission reliability deteriorates due to strong interference from neighboring cells
Solution Approach 1:
The patent segments the transmission process by separating control information transmission from data transmission into different subframes. Control information is transmitted in a first subframe with less interference, while data is transmitted in a second subframe, allowing the UE to decode control information before decoding data, thereby improving reliability without significantly sacrificing efficiency
Solution Approach 2:
The patent applies preliminary action by transmitting control information in advance in a first subframe before transmitting data in a second subframe. This allows the UE to prepare decoding parameters and resources beforehand, ensuring reliable control information reception even when data transmission occurs in high-interference subframes
2Reliability
If control information is transmitted in subframes with less interference, then transmission reliability is improved, but transmission time increases due to cross-subframe signaling
Solution Approach 1:
Control information is transmitted in advance in a first subframe with less interference, allowing the UE to decode it before the data transmission in the second subframe. This preliminary transmission ensures reliability while the time gap between subframes is managed through efficient decoding window selection
Solution Approach 2:
The patent introduces dynamic subframe selection where the network can flexibly choose which subframes are suitable for control information transmission based on interference conditions. The UE adapts by performing window-based decoding to identify and decode control information from appropriate subframes, balancing reliability and time efficiency
3Reliability
If UE performs window-based decoding to find control information, then decoding reliability is improved, but device complexity increases
Solution Approach 1:
Instead of requiring the UE to decode every possible subframe, the patent applies partial action by limiting the search to a decoding window that covers only the relevant subframes where control information is likely to be transmitted. This reduces the number of decoding operations while still ensuring reliable control information acquisition
Solution Approach 2:
The UE autonomously performs window-based decoding to identify and decode control information from appropriate subframes within the decoding window. This self-service approach allows the UE to adapt to varying interference conditions without requiring complex network coordination, balancing decoding reliability with manageable device complexity
Data Source
AI summary
Techniques for reliably transmitting and receiving control information in a wireless network are described. A cell may typically send control information on a control channel and associated data (e.g., system information) on a data channel in the same subframe. This subframe may have strong interference from other cells. For cross-subframe signaling, the cell may transmit the control information in a first subframe and the associated data in a second subframe. The first subframe may be a usable subframe for the cell and may have less interference from other cells. A UE may not know the location of the first subframe and may perform window-based decoding. The UE may decode the control channel in at least one subframe within a decoding window covering the first subframe to obtain the control information. The UE may then decode the data channel in the second subframe based on the control information to obtain the data.