Indoor Radio Access Network Using Ethernet-Linked Remote Units
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Solution Overview
Problem
The demand for mobile data transmission capacity and consistent RF coverage in densely populated indoor locations, such as buildings, is increasing, and traditional Distributed Antenna Systems (DAS) are inadequate for efficient and scalable solutions.
Innovation Solution
A communication system comprising remote units and a controller, where the controller performs baseband modem functions and is connected via an intermediate switched Ethernet network, enabling real-time scheduling, synchronization, and compression of data, with remote units handling RF signals and antennas to provide flexible and interference-free coverage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional Distributed Antenna Systems (DAS) are used to provide RF coverage in densely populated indoor locations, then RF coverage is maintained, but the system becomes inadequate for efficient and scalable mobile data transmission
Solution Approach 1:
The system divides the coverage area into multiple cells, each served by a remote unit with one or more antennas. This segmentation allows independent configuration and optimization of each cell, enabling scalable expansion from small to large coverage areas by simply adding or removing remote units rather than redesigning the entire system.
Solution Approach 2:
The system dynamically adapts cell configurations by allowing remote units to be assigned to different cells based on demand. Cells can be created, modified, or removed without physical reconfiguration of infrastructure, providing flexible scalability to match changing traffic patterns and coverage requirements.
2Adaptability or versatility
If remote units and controller are separated by an intermediate network, then system flexibility and scalability are improved, but transmission latency and synchronization complexity increase
Solution Approach 1:
The system establishes continuous synchronization between the controller and remote units using timestamp messages exchanged over the intermediate network. This continuous timing reference allows the system to compensate for network latency, maintaining real-time coordinated operation despite the physical separation and enabling flexible configuration without time loss penalties.
3Area of stationary object
If multiple remote units are used to provide coverage, then coverage area and capacity are enhanced, but interference between units increases
Solution Approach 1:
The system assigns different frequency resources to different cells served by remote units, creating local quality differentiation. Each remote unit operates on specifically allocated frequencies for its cell, preventing interference with other remote units while allowing each to provide optimized local coverage, thereby expanding total coverage area without mutual interference.
Data Source
AI summary
A communication system includes at least one remote unit to exchange RF signals with mobile devices, at least some of the RF signals comprising information destined for, or originating from, a mobile device. The communication system also includes a controller coupled to an external network. Baseband data corresponding to the information is communicated between the controller and the at least one remote unit in the frequency domain via an intermediate network.