Cooperative MIMO Base Station RRU Resource Allocation
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Solution Overview
Problem
Current small cell communication systems face challenges in efficiently managing high data rate transmission under limited frequency spectra and capital expenses, particularly in extending wireless coverage with remote radio units (RRUs) that require flexible and economical deployment.
Innovation Solution
A method and base station configuration for cooperative multiple-input-multiple-output (MIMO) wireless communication, where user equipment information and service flows are processed to determine MIMO schemes, and resource blocks are allocated and distributed across multiple RRUs for efficient downlink sub-stream transmission, enabling flexible and economical coverage extension.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If remote radio units (RRUs) are disposed in one or more remote locations to extend wireless coverage, then coverage area is improved, but system complexity increases due to additional interface connections and coordination requirements
Solution Approach 1:
The base station is segmented into centralized baseband units (BBUs) and distributed remote radio units (RRUs), allowing coverage extension while managing complexity through functional separation. Each RRU operates semi-independently with its own radio frequency processing, reducing the complexity burden on individual components while achieving extended coverage.
Solution Approach 2:
A centralized controller acts as an intermediary between multiple RRUs and the core network, coordinating resource allocation, scheduling, and MIMO operations. This intermediary manages the complexity of coordinating distributed RRUs, enabling coverage extension without proportionally increasing overall system complexity.
2Area of stationary object
If multiple RRUs are deployed at different geographical locations, then coverage extension is improved, but capital expenses increase due to additional hardware installations
Solution Approach 1:
Multiple RRUs are designed with identical, standardized interfaces and functionalities, allowing them to be deployed at different locations using the same hardware platform. This universality reduces capital expenses by eliminating the need for custom hardware at each site while achieving coverage extension through strategic placement of identical units.
Solution Approach 2:
The system allows dynamic configuration of RRU parameters such as transmission power, frequency allocation, and antenna patterns through software control rather than hardware modifications. This enables coverage extension and optimization without additional capital expenses for hardware changes at each RRU location.
3Productivity
If cooperative MIMO transmission is implemented across multiple RRUs, then data throughput is improved, but resource allocation complexity increases due to need for coordinated resource blocks
Solution Approach 1:
The centralized controller implements feedback mechanisms where each RRU reports channel state information, resource utilization, and transmission quality to the controller. Based on this feedback, the controller dynamically adjusts resource block allocation and MIMO parameters across RRUs, achieving high throughput while managing allocation complexity through data-driven decisions.
Solution Approach 2:
The system performs preliminary resource allocation and MIMO configuration in advance based on predicted traffic patterns and channel conditions. Resource blocks are pre-assigned to potential MIMO groups, and preliminary scheduling decisions are made before actual data transmission, reducing real-time allocation complexity while maintaining high throughput efficiency.
Data Source
AI summary
The present disclosure proposes a method of cooperative MIMO wireless communication, and a base station using the same. A base station would have a plurality of radio remote units (RRUs), and each of the RRUs may have a specific radio coverage and a plurality of antennas coupled to each of the RRUs. The function of the base station may include receiving a UE information, receiving a service flow, deriving a service type of the service flow, and determining a MIMO scheme, modulating the service flow into a MIMO stream according to the MIMO scheme, allocating a plurality of resource blocks, wherein the resource blocks may correspond to a portion or all of the RRUs, distributing the MIMO stream into a plurality of downlink sub streams and transmitting the downlink sub streams through the resource blocks by the RRUs corresponding to the resource blocks.