CSI-RS Resource Multiplexing for 5G Base Stations
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Solution Overview
Problem
In the context of LTE and 5G systems, the incompatibility of different transmission schemes for channel state information-reference signals (CSI-RS) due to limited resource element (RE) configuration, leading to insufficient RE resources for supporting multiple UE capabilities with the TM9 protocol.
Innovation Solution
A method and device for configuring CSI-RS resources using multiplexing techniques such as time division, frequency division, and code division multiplexing to allow multiple transmission schemes to share limited RE resources, ensuring compatibility and efficient resource utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple transmission schemes are configured to support different UE capabilities, then the adaptability of the system is improved, but the RE resource consumption increases beyond the protocol limit of 40 REs per RB
Solution Approach 1:
The patent combines multiple transmission schemes (R10 and R14 class A schemes) into a unified resource configuration. By merging the resource allocation mechanisms of different schemes, the system can support multiple UE capabilities simultaneously while keeping the total RE configuration within the 40 RE limit per RB, thus resolving the contradiction between adaptability and resource consumption.
Solution Approach 2:
The patent creates a universal resource configuration that serves multiple transmission schemes. The same set of CSI-RS resources is configured to support both R10 and R14 class A schemes, making the resource allocation multi-functional. This universal configuration allows the system to adapt to different UE capabilities without requiring separate dedicated resources for each scheme, thereby maintaining compatibility while controlling resource usage.
2Adaptability or versatility
If the number of CSI-RS resources is increased to support more transmission schemes, then the versatility of the system is improved, but the device complexity increases
Solution Approach 1:
The patent merges multiple transmission scheme configurations into a single unified resource set. Instead of maintaining separate CSI-RS resource configurations for R10 and R14 class A schemes, the system uses one combined configuration that both schemes can utilize. This merging approach increases versatility while reducing configuration complexity by eliminating redundant resource definitions.
Solution Approach 2:
The patent implements a universal CSI-RS resource configuration that functions for multiple transmission schemes simultaneously. This single multi-functional configuration replaces what would otherwise require multiple separate configurations, thereby supporting more transmission schemes without proportionally increasing device complexity. The universal configuration acts as a shared resource pool that adapts to different scheme requirements.
Data Source
AI summary
Embodiments provide a CSI-RS sending method and device, and a base station. The CSI-RS sending method includes: receiving capability indication information of each user equipment UE in a cell; determining N transmission schemes based on the capability indication information; configuring CSI-RS resources to be multiplexed by CSI-RSs corresponding to the N transmission schemes; and sending, to corresponding UE based on each of the N transmission schemes, a CSI-RS that is carried on the CSI-RS resource and that corresponds to the corresponding transmission scheme. It can be learned that according to the technical solutions in the embodiments of this application, when resources are limited, CSI-RSs corresponding to different transmission schemes are sent in a resource multiplexing manner, so that a plurality of transmission schemes can be compatible, and resource utilization can be improved.