Base Station Channel Estimation via Neighbor Assistance Muting
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Solution Overview
Problem
In wireless communication systems, full/flexible duplexing faces challenges in mitigating base station to base station cross-link interference, which affects the accuracy of interference covariance estimation and signal demodulation due to simultaneous uplink and downlink transmissions.
Innovation Solution
The method involves signaling a time-frequency muting pattern to user equipment based on assistance information from neighboring base stations, allowing for interference covariance matrix estimation and desired signal demodulation by muting specific uplink resources, thereby enhancing the accuracy of interference channel measurement and reducing cross-link interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If simultaneous uplink and downlink transmissions are enabled in full/flexible duplexing, then spectral efficiency and system capacity are improved, but cross-link interference between base stations increases
Solution Approach 1:
The system performs preliminary actions by obtaining assistance information from neighboring base stations before conducting channel estimation. This includes acquiring DMRS configuration parameters, resource allocation information, and muting patterns in advance to prepare for interference mitigation during simultaneous uplink-downlink transmissions
Solution Approach 2:
Assistance information from neighboring base stations serves as an intermediary to enable accurate channel estimation. The assistance information includes DMRS parameters, resource allocation details, and muting patterns that mediate between the interfering transmissions and the desired signal reception
2Adaptability or versatility
If base station transmits downlink signals while receiving uplink signals, then full duplex communication is achieved, but self-interference and cross-link interference are generated
Solution Approach 1:
The base station performs preliminary actions by obtaining assistance information from neighboring base stations before conducting channel estimation. This includes acquiring DMRS configuration parameters, resource allocation information, and muting patterns in advance to prepare for interference mitigation during simultaneous uplink-downlink transmissions
Solution Approach 2:
Assistance information from neighboring base stations serves as an intermediary to enable accurate channel estimation. The assistance information includes DMRS parameters, resource allocation details, and muting patterns that mediate between the interfering transmissions and the desired signal reception
3Measurement precision
If assistance information from neighboring base stations is obtained, then interference channel estimation accuracy is improved, but signaling overhead and system complexity increase
Solution Approach 1:
The system applies partial action by selectively obtaining only the necessary assistance information parameters needed for interference mitigation, such as DMRS configuration parameters and resource allocation information, rather than exchanging all possible signaling data between base stations
Data Source
AI summary
Techniques are provided for facilitating channel estimation to mitigate cross-link interference between a base station in a first cell and at least one neighbor base station. In the context of a method performed by the base station, an indication for assistance information to support channel estimation is provided from the base station to at least one neighbor base station. The method also includes receiving assistance information from at least one neighbor base station. The method further includes causing a time-frequency muting pattern to be signaled to at least one user equipment in a first cell. The method also includes estimating an interference covariance matrix from an interfering link of the at least one neighbor base station based at least in part on the assistance information and estimating the desired signal based on the interference covariance matrix. Corresponding method, apparatus and computer-readable storage mediums are also provided for a base station.