LTE Data Transmission Mapping Non-Zero Power CSI-RS Resource Elements
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Solution Overview
Problem
In wireless communications, the configuration of non-zero power and zero power CSI-RS resources in LTE systems leads to reduced spectrum efficiency due to the inability to use REs allocated for CSI-RS measurements for data transmission, resulting in lower data transmission efficiency.
Innovation Solution
A data transmission method that maps data to REs corresponding to non-zero power CSI-RS resources, excluding specific REs that overlap with zero power CSI-RS resources, thereby optimizing the use of REs for data transmission and improving spectrum efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple CSI-RS resources are configured for UE measurement, then measurement accuracy is improved, but the number of REs available for data transmission is reduced
Solution Approach 1:
The patent segments CSI-RS resources into different types (non-zero power and zero power CSI-RS) and applies different mapping rules to each type. Non-zero power CSI-RS resources allow data mapping on non-overlapping REs, while zero power CSI-RS resources are excluded from data mapping. This segmentation enables selective utilization of REs, improving data transmission efficiency while maintaining measurement accuracy.
Solution Approach 2:
The patent applies different quality characteristics to different REs based on their CSI-RS resource type. REs corresponding to non-zero power CSI-RS resources have different properties (allowing data mapping when not overlapping) compared to REs corresponding to zero power CSI-RS resources (excluded from data mapping). This local differentiation optimizes the use of REs for both measurement and data transmission purposes.
2Reliability
If more REs are allocated to CSI-RS resources, then measurement capability is enhanced, but spectrum efficiency deteriorates
Solution Approach 1:
The patent introduces dynamic determination of REs available for data mapping based on the configuration of CSI-RS resources. The set of REs excluded from data mapping is dynamically adjusted according to the zero power CSI-RS resource configuration, allowing the system to adaptively optimize the balance between measurement capability and spectrum efficiency.
Solution Approach 2:
The patent changes the parameter of RE utilization by introducing the concept of non-zero power versus zero power CSI-RS resources. This parameter change enables selective data mapping on REs, transforming the static exclusion of all CSI-RS REs into a dynamic selection process that improves spectrum efficiency while maintaining measurement reliability.
Data Source
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AI summary
Embodiments of the present invention provide a data transmission method that relates to the field of communications technologies and is invented for effectively improving the spectrum efficiency of data transmission. The data transmission method includes: mapping, to a resource element according to a preset rule, data that needs to be transmitted to a user equipment, where the preset rule includes: mapping data to the resource element corresponding to a non-zero power CSI-RS in a first set of the user equipment, unless the resource element is a specific resource element, where the specific resource element includes a resource element that is among the resource elements corresponding to the non-zero power CSI-RS in the first set and overlaps a resource element corresponding to a zero power CSI-RS; and transmitting the mapped data to the user equipment. The present invention is applicable to a radio communications system such as Long Term Evolution.