Interference Cancellation Using Interfering Base Station DCI
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Solution Overview
Problem
In wireless communication systems, especially in LTE-A, there is a challenge in efficiently transmitting and receiving channel state information, particularly due to interference from multiple base stations, which affects data transmission rates and reliability.
Innovation Solution
A method and device for a user equipment to receive downlink control information from a base station, including scheduling information for a physical downlink shared channel, and from a second interfering base station, allowing for interference cancellation and improved data reception by utilizing quasi-co-located reference signals and independent transmission modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple base stations transmit downlink signals simultaneously, then data transmission rate increases, but interference between base stations deteriorates reception reliability
Solution Approach 1:
The patent converts the harmful interference from neighboring base stations into a beneficial resource for interference cancellation. By receiving and decoding the DCI from the interfering base station, the UE can reconstruct and subtract the interference signal from the received signal, thereby improving reception reliability while maintaining high data transmission rates through coordinated multi-base station operation
2Reliability
If the user equipment receives and processes scheduling information from multiple base stations, then interference cancellation capability improves, but processing complexity increases
Solution Approach 1:
The patent applies preliminary action by having the interfering base station transmit its DCI scheduling information before the UE performs interference cancellation. This allows the UE to pre-process and decode the interfering signal's control information, making the subsequent interference cancellation process more efficient and manageable despite the increased processing requirements
3Measurement precision
If downlink control information from interfering base station is transmitted frequently, then interference cancellation accuracy improves, but uplink resource consumption increases
Solution Approach 1:
The patent implements partial action by having the UE process only the essential DCI information from the interfering base station that is necessary for interference cancellation, rather than processing all possible control information. This selective processing approach maintains adequate interference cancellation accuracy while minimizing uplink resource consumption for feedback and reporting
Data Source
AI summary
The present invention relates to a wireless communication system. A method by which a terminal cancels interference and receives data in a wireless communication system, according to one embodiment of the present invention, comprises the steps of receiving first downlink control information (DCI) including scheduling information for receiving a physical downlink shared channel (PDSCH) from a base station, receiving second DCI including scheduling information on an interference channel from a second base station, and canceling the interference from the second base station on the basis of the first DCI and the second DCI, and receiving the PDSCH.