PDSCH Resource Mapping for Accurate Interference Measurement
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Solution Overview
Problem
In Coordinated Multipoint Transmission/Reception systems, accurate interference measurement by User Equipment (UE) is hindered due to dynamic PDSCH transmission points, leading to inaccurate Channel Quality Indication (CQI) estimation, as current configurations of zero power CSI-RS resources fail to match with the active PDSCH transmission points.
Innovation Solution
A method and device determine the correspondence between PDSCH Resource Element (RE) mapping parameters and zero power CSI-RS resources, allowing UE to receive PDSCH on resources other than those corresponding to the current PDSCH transmission points, ensuring accurate interference measurement by configuring zero power CSI-RS resources for interference measurement and notifying UE through Downlink Control Information (DCI) over PDCCH or E-PDCCH.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If zero power CSI-RS resources are configured for interference measurement, then interference measurement capability is provided, but accurate interference measurement cannot be achieved when PDSCH transmission points change dynamically
Solution Approach 1:
The patent applies dynamics by making the zero power CSI-RS resource configuration adaptive to dynamic PDSCH transmission points. The network device determines zero power CSI-RS resources based on the actual PDSCH transmission points and notifies the terminal through DCI, allowing the interference measurement resources to dynamically adjust when transmission points change, thus maintaining measurement accuracy in dynamic scenarios.
Solution Approach 2:
The patent changes the parameter configuration approach by using DCI to dynamically indicate zero power CSI-RS resource configurations instead of static higher-layer signaling. This allows the resource allocation parameters to be adjusted in real-time according to the actual PDSCH transmission points, resolving the contradiction between measurement accuracy and adaptability to dynamic changes.
2Measurement precision
If zero power CSI-RS resources are configured for all PDSCH transmission points, then interference measurement is enabled, but signaling overhead increases
Solution Approach 1:
The patent extracts only the necessary zero power CSI-RS resources corresponding to the actual PDSCH transmission points rather than configuring resources for all possible transmission points. By determining and notifying only the relevant resources through DCI, the signaling overhead is reduced while maintaining adequate interference measurement capability for the active transmission points.
Solution Approach 2:
The patent applies partial action by configuring zero power CSI-RS resources only for the specific PDSCH transmission points that are currently active, rather than providing complete coverage for all possible transmission points. This partial configuration is sufficient for interference measurement purposes while minimizing signaling overhead.
3Reliability
If static configuration of zero power CSI-RS resources is used, then system compatibility is maintained, but accurate interference measurement fails with dynamic transmission points
Solution Approach 1:
The patent achieves universality by using DCI, which is a standard LTE downlink control format, to notify zero power CSI-RS resource configurations. This approach maintains compatibility with existing LTE systems and terminals while enabling dynamic adaptation to changing transmission points, thus serving both compatibility and accuracy requirements through a multi-functional control mechanism.
Data Source
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AI summary
The present invention relates to the field of communications, and disclosed are a method and device for determining a PDSCH transmission resource. The method is: in the embodiments of the present invention, a network side determines a mapping relationship between a PDSCH transmission point and a zero-power CSI-RS for UE, and the UE does not receive a PDSCH over a zero-power CSI-RS resource which corresponds to a cell currently transmitting the PDSCH and measures an interference and still receives the PDSCH over a zero-power CSI-RS resource which corresponds to a cell not currently transmitting the PDSCH and measures an interference, thereby ensuring that the UE can accurately measure the interference and further improving the accuracy of CQI estimation; furthermore, the signalling overhead required for realizing the technical solution of the present invention is very small, only some RRC signalings are required, and a dynamic signaling can reuse a current signaling to the greatest extent, in this way, the compatibility of the system is effectively improved and the complexity of implementation is reduced.