CSI-RS Power Utilization in FD-MIMO Systems
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Solution Overview
Problem
In wireless communication systems, particularly in FD-MIMO systems with large-scale antennas, the existing methods for configuring and transmitting CSI-RS (Channel State Information Reference Signal) face challenges in efficiently utilizing power resources, leading to increased uplink overhead and reduced data transmission capacity due to the need for extensive channel measurement and interference estimation.
Innovation Solution
The method involves transmitting higher layer signaling to UE (User Equipment) indicating the number of antenna ports and CDM (Code Division Multiplexing) type, configuring CSI-RS resources based on this information, and using multiple antenna ports for CSI-RS transmission, allowing for optimized power utilization and reduced overhead by employing CDM-4 mapping schemes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If existing CSI-RS transmission methods are used in FD-MIMO systems with large-scale antennas, then channel measurement and interference estimation can be performed, but power resources are not efficiently utilized and uplink overhead increases
Solution Approach 1:
The patent segments the CSI-RS transmission by configuring multiple CSI-RS resource sets with different CDM types and antenna port groups. This allows the system to divide the large-scale antenna array into manageable segments that can be measured and reported separately, improving power efficiency while maintaining measurement accuracy across the entire antenna array.
Solution Approach 2:
The patent introduces a new dimension for CSI-RS configuration by implementing CDM-4 mapping schemes that utilize both frequency and time dimensions. This allows multiple antenna ports to share the same time-frequency resources through code division, reducing the overall power consumption while enabling comprehensive channel measurement across multiple dimensions.
2Loss of information
If existing CSI-RS transmission methods are used in FD-MIMO systems, then channel state information can be obtained, but data transmission capacity is reduced due to increased uplink overhead
Solution Approach 1:
The patent merges multiple CSI-RS configurations into unified resource sets that can be efficiently measured and reported. By combining antenna ports with the same CDM type into single measurement groups, the system reduces the amount of uplink feedback required while maintaining complete channel state information, thereby increasing data transmission capacity.
Solution Approach 2:
The patent changes the configuration parameters of CSI-RS by introducing CDM-4 mapping schemes and configurable antenna port groups. These parameter changes allow the system to optimize the balance between measurement accuracy and feedback overhead, enabling higher data transmission capacity without sacrificing channel state information quality.
3Measurement precision
If multiple antenna ports are used for CSI-RS transmission, then channel estimation accuracy is maintained, but the burden on power amplifiers increases
Solution Approach 1:
The patent makes the CSI-RS transmission system universal by implementing CDM-4 mapping schemes that allow the same time-frequency resources to serve multiple antenna ports simultaneously. This multi-functionality reduces the total power required for transmission while maintaining the ability to estimate channels for all antenna ports accurately.
Solution Approach 2:
The patent uses code division multiplexing to create virtual copies of the same time-frequency resources for different antenna ports. Instead of transmitting separate physical signals for each antenna port, the system uses coded versions that share the same physical resources, significantly reducing the power amplifier burden while preserving channel estimation accuracy.
Data Source
AI summary
A method, provided by the present disclosure, of transmitting a reference signal by a base station in a wireless communication system using a plurality of antenna ports including mapping wireless resources, for transmitting a reference signal, to a plurality of antenna ports for transmitting the reference signal; and using the wireless resources and transmitting the reference signal to a terminal through the mapped antenna ports. The mapping to the antenna ports is executed on the basis of a combination of a first mapping pattern between the wireless resources and the antenna ports and a second mapping pattern between the wireless resources and the antenna ports.