Cell Control Reference Signal Design for M-MIMO Coverage
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Solution Overview
Problem
In LTE wireless communication systems, the existing reference signals struggle to balance array gains and coverage area, particularly in M-MIMO technology, where narrow beams improve throughput but reduce coverage, and wide beams compromise array gains, leading to poor signal reception at cell edges.
Innovation Solution
The method involves using N antenna ports to send cell control reference information on specific resource units, concentrating power for enhanced coverage without affecting data transmission, and generating a cell control reference signal sequence based on pseudo-random sequences to ensure orthogonality and efficient resource allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If narrow beams are used in M-MIMO technology, then throughput is improved, but coverage area is reduced
Solution Approach 1:
The patent segments the transmission of common control information by using a subset of antenna ports (N antenna ports out of M total antenna ports) to transmit reference signals and control information. This segmentation allows the system to concentrate power from multiple antenna ports onto specific resource units, achieving narrow beam effects for improved throughput while maintaining coverage through strategic port selection and resource unit allocation.
2Area of stationary object
If wide beams are used in M-MIMO technology, then coverage area is improved, but array gains are compromised
Solution Approach 1:
The patent merges the transmission functions of multiple antenna ports by mapping reference signals and common control information onto resource units formed by combining signals from N antenna ports. This merging approach allows the system to achieve array gains through constructive interference of multiple antenna signals while maintaining coverage area through the distributed resource unit mapping across the frequency-time grid.
3Device complexity
If CRS is used for both channel detection and coherent demodulation of broadcast/control signals, then device complexity is reduced, but overheads increase
Solution Approach 1:
The patent extracts the reference signal function from the traditional CRS configuration and creates a dedicated cell control reference signal that is transmitted only on resource units carrying common control information. This extraction separates the reference signal transmission from data transmission resources, reducing overheads by avoiding redundant reference signals in data regions while maintaining the ability to perform channel detection and coherent demodulation.
4Device complexity
If CRS cannot perform directional transmission for each UE, then device complexity is reduced, but flexibility of precoding scheme is reduced
Solution Approach 1:
The patent introduces dynamic resource unit mapping where the base station can flexibly allocate and map resource units across different antenna ports and time-frequency resources. This dynamic mapping capability allows the system to adapt precoding schemes dynamically by adjusting which antenna ports are activated and how resource units are distributed, providing flexibility while keeping the reference signal transmission mechanism relatively simple.
Data Source
AI summary
The present disclosure relates to a method for sending cell common control reference information. In one example method, before common control information needs to be sent, a base station having M antenna ports generates the cell control reference information used to detect the common control information. The base station maps the common control information and the cell control reference information to one or more resource units (RUs) of N antenna ports. The N antenna ports are a subset of the M antenna ports. The base station uses the one or more RUs to send the common control information and the cell control reference information used to detect the common control information to a user equipment (UE) within a coverage area of the base station.