CSI-RS Antenna Port Grouping for Full-Dimension MIMO Capacity
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently managing channel-state-information reference signals for advanced wireless systems, particularly in full-dimension MIMO systems, which affect radio interface efficiency and coverage due to increasing mobile data traffic.
Innovation Solution
The implementation of a method for receiving and processing complex-valued modulation symbols using a reference signal sequence in multiple-input multiple-output (MIMO) radio links, specifically configuring code-division multiplex-4 (CDM-4) to map CSI-RS antenna ports with specific cyclic prefixes and configurations, optimizing the number of CSI-RS antenna ports and resources for improved signal transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the number of CSI-RS antenna ports is increased to support full-dimension MIMO systems, then the system capacity and coverage are improved, but the complexity of reference signal management and processing increases
Solution Approach 1:
The patent segments the large number of CSI-RS antenna ports into multiple groups, where each group is associated with a specific antenna port subset. This segmentation allows the receiver to process reference signals in manageable groups rather than handling all ports simultaneously, thereby reducing processing complexity while maintaining support for full-dimension MIMO systems with high system capacity
Solution Approach 2:
The patent introduces a new dimension of organization by associating CSI-RS reference signals with specific antenna port groups rather than treating all ports uniformly. This dimensional change in signal organization enables efficient management of large port configurations by adding a grouping layer that simplifies the reference signal processing architecture
2Productivity
If code-division multiplexing is applied to map reference signal sequences to modulation symbols, then the signal transmission efficiency is improved, but the processing complexity at the receiver increases
Solution Approach 1:
The patent applies code-division multiplexing patterns and scrambling sequences in advance during the reference signal generation and mapping process. By pre-configuring the CDM patterns and applying scrambling before transmission, the receiver can use these predetermined patterns to efficiently separate and process signals from different antenna ports, reducing the computational burden during reception while maintaining high transmission efficiency
Data Source
AI summary
A mobile station includes a receiver configured to receive containing a complex-valued modulation symbol from a base station, a processor configured to extract the complex-valued modulation symbol from the signal, wherein in response to being configured with code-division multiplex-4 (CDM-4), the complex-valued modulation symbol is mapped using a reference signal sequence. A base station includes a processor configured to generate a reference signal sequence for each subcarrier and OFDM symbol, and in response to being configured with code-division multiplex-4 (CDM-4), map a reference signal sequence to the complex-valued modulation symbols. Other embodiments including a method for performing communication on multiple input multiple output (MIMO) radio links are also disclosed.