User:Bouteloua/Distributed Node B

Distributed Node B is a telecommunications base station technology sold by Huawei that enables telecommunications operators to deploy 3G networks. The system consists of a baseband unit (BBU) and a radio remote unit (RRU), which are installed separately and process baseband signals and radio frequency signals respectively. To form the architecture of Distributed Node B, a BBU connects to one or more RRUs with Common Public Radio Interface. Distributed Node B is part of Huawei’s overall Universal Mobile Telecommunications System (UMTS) offering, intended for the deployment of faster, lower cost 3G networks.

Development
Huawei began developing Distributed Node B products in 2002 and released its first RRU in 2003. The company announced the global launch of its customized UMTS Distributed Node B Solution at the 3GSM World Congress 2005 in Cannes, France.

According to Huawei, Distributed Node B was developed in response to customer demand for a technology which could be installed faster, with lower operational costs. The company states that its compact BBUs can be placed in existing spaces, rather than requiring an equipment room, and the technology is small, light weight, and allows direct installation near the antenna, which can be completed by a single person. In addition, Huawei states that its Distributed Node B technology reduces energy consumption by approximately one-third compared with a conventional base transceiver station, and is designed to handle burst traffic.

Huawei’s first W-CDMA Node B Outdoor RRU was connected in March 2006. Key features included a standard CPRI interface, transmit diversity mode and multiple receive diversity modes, large transmission power and high receiver sensitivity.

Applications
Huawei’s Distributed Node B solution may be used in fully outdoor, partially outdoor, and indoor site-sharing applications, using different configurations and locations of BBUs, RRUs and related equipment. In addition, BBUs and RRUs are connected to each other through optical fiber, which can be extended as far as 40 kilometers, designed to be used for mobile network constructions in large cities.

Customers
In 2006, Huawei announced contracts to deploy Distributed Node B in Tajikistan, with mobile operator VimpelCom, in Spain with Vodafone, and in the United Arab Emirates with Etisalat. The following year, Huawei deployed Distributed Node B base stations in Singapore as part of a 3G network infrastructure upgrade for StarHub  and announced it would deploy the technology in Japan with EMOBILE, and in Sri Lanka for Bharti Airtel Lanka. In 2011, Huawei launched an LTE TDD network using Distributed Node B technology in Saudi Arabia with Saudi Telecom Company.