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More Efficient, Lower Cost DAS w/ CPRI (Common Public Radio Interface)

Dec 28, 2017

More Efficient, Lower Cost DAS w/ CPRI (Common Public Radio Interface)

DAS solutions fed by CPRI have been proven to improve performance and reduce overall cost when compared to DAS architectures that are based on traditional RF.

What is CPRI?

CPRI stands for Common Public Radio Interface. It is a wireless communications network specification that is still evolving. It is defined by a group of OEMs and addresses the communication link between the radio equipment, known as remote radio units (RRUs) and radio equipment controller units, commonly called baseband units (BBUs).

Common Public Radio Interface (CPRI) for Mobile Communication Networks

CPRI is however not a standard, as it only defines the critical conditions for connectivity, control communications and interfacing transport between BBUs and RRUs. Radio equipment OEMs adhere to the framework, but encode their own unique version of the specification to deliver processing efficiencies that is unique to their own hardware.

System vendors in the distributed antenna system (DAS) space have traditionally not been able to use the CPRI protocol to interface base station systems directly with their equipment. The DAS interface instead had to use remote radio heads for amplification, analog radio frequency (RF) processing, complex cabling networks and stacks of signal manipulation panels. The connections between these passive and active network elements often resulted in errors and loss of communication between the DAS inputs and the BBUs.

There's however now a direct digital optical link available from the DAS to the BBU with CPRI. This digital interface is direct and removes the need for redundant RF conditioning and processing. DAS solutions that are fed by CPRI have been proven to be simple to install, improve performance and reduce overall cost when compared to DAS architectures that are based on traditional RF.

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  • What’s a good wifi signal booster device? Peter, keep in mind the difference between a cell phone booster (which boosts the cell phone signal you pick up in your home or car) to a wifi signal booster (which boosts your wifi signal so it’s consistent throughout your home). Either way, check out reviews, look for a seller that has knowledge of what system works best for each particular setting (such as the square footage of your home), and get a booster with a good warranty. For example, this site has a ton of reviews and helpful information not only on their product, but other products. They also provide general information so you can do some research.

    Langston White on
  • These DAS things look like they’re more for buildings. I’m thinking in terms of my home or auto. What’s a good wifi signal booster device?

    Peter J. Frankling on
  • Is there any difference between common public radio interface and a common packet radio interface? I didn’t see anything mentioned here, but I’ve heard people discussing cpri specs and cpri cable prices so I was wondering if they were using the wrong terminology. I’ll have to look into this further so when someone asks me about cpri cable specifications, I have the proper acronym info.

    Brad Northland on
  • What are the cpri cable specifications for when you use them with a DAS installation? Is this something that would be in a cpri tutorial? I know that a cell phone booster or DAS installer would know this, but I’m curious just because I’m trying to teach myself about these different methods of boosting cell phone signals so you can make calls without any hassles (like dropped calls).

    Rex Benderson on
  • I’ve heard of DAS systems and how they can make cell phones work well in the deepest corner of large buildings such as stadiums and shopping malls. However, I didn’t know anything about the cpri cable specifications and how they can make DAS systems run even better. Thanks for this cpri tutorial. Your writing team is adept at explaining things.

    Robert K. Marshall on

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