30/03/12
Anyone can explain how huwai 3900 Node B works? - Telecom Question Answer, Telecom Intervie
A
3900 N
B
? 3900 asked 3 weeks ago in H points)
BTS & NODE-B
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by
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BTS3900(-48 )
The BTS 3900 cabinet that uses -48v DC pwr contains the WRFU,MRFU,FAN unit,BBU & DCDU
Fig:BTS 3900(-48v) configuration
BBU 3900 E It is a baseband unit that implements communication between NODEB & the RNC. The BBU 3900 has the following functions: Providing ports for data commn between NODEB & RNC. Providing the CPRI interface for commn between the BBU & RRU or the RFU. Providing the USB ports,one of which facilitates NODEB upgraded when a USB disk is inserted during software installation & data configuration. telequiz.telecomseva.com/?qa=4722/print
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30/03/12
Anyone can explain how huwai 3900 Node B works? - Telecom Question Answer, Telecom Intervie
Processing UL & DL baseband signals. Managing the entire NODEB system in terms of O&M & signalling procesing. Providing the sys clk. S
BBU3900
The BBU 3900 which features a modular design,consists of the transport subsystem,baseband subsystem,control subsystem & power module.
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S
It has the following functions: Providing physical ports for data communication between the nodeb & rnc. Providing o&m channel between BBU 3900 & the OMC.
B
S
It processes uplink(ul) & downlink(dl) baseband data.The functions of the baseband subsystem are performed by the following modules: UL baseband data processing module. DL baseband data processing module. In the baseband subsystem,the BBU 3900 has an integrated CPRI interface module that connects the BBU 3900 to the RRU.
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It manages the entire NODEB.The subsytem performs OM,processes signaling & provides the system clock. The OM module has functions such as equipment management,configuration management,alarm management,software management,commissioning management. The signaling processor has functions such as NBAP signaling processing,ALCAP processing,SCTP processing & logical resource management. The clock module has a functions such as providing a phase-locked line clock extracted from Iub interface. telequiz.telecomseva.com/?qa=4722/print
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30/03/12
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Anyone can explain how huwai 3900 Node B works? - Telecom Question Answer, Telecom Intervie
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It converts +24v or -48v DC power into the power required by the boards & provides a port connect to the ext monitoring device.
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WRFU/MRFU
It consists of the interface module,TRX,PA,filter,LNA.
Interface Module The functions of this module are as: Rcv Dl baseband data from the BBU. Transmit UL baseband data to the BBU. Forwarding the data sent from the cascaded WRFUs/MRFUs TRX.
TRX It provides two RX channels & TX channels for RF signals. The RX channel perform the following functions: Down-conversion of the received signals to the IF signals. Amplification of the IF signals. A-D conversion. Digital down conversion. Matched Filtering. Digital Automatic Gain Control. telequiz.telecomseva.com/?qa=4722/print
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30/03/12
Anyone can explain how huwai 3900 Node B works? - Telecom Question Answer, Telecom Intervie
The TX channel performs the following functions: D-A conversion. Up conversion of the IF signals to the TX band.
PA It adopts the DPD to amplify low-power RF signals from the TRX.
F It consist of a duplex filter & an RX filter.It performs the following functions The duplex filter multiplexes one RX & one TX signals over RF channel,so that they can share one antenna channel .In addition it filters RX & TX signals.
LNA It amplifies the signal received from the antenna system. Functions of the WRFU/MRFU It is the WCDMA RF filter unit & the MRFU is the multi-carrier RF filter unit. It performs the following functions: It which adopts the direct frequency conversion technology,modulates the baseband signal to the WCDMA TX band .After filtering & amplification the baseband signals are transmitted to the antenna system through the duplex filter. It receives UL RF signals from the antenna system & then down-converts the received signals to IF signals.After amplification.A-D conversion,digital down-conversion,matched filtering,AGC,the IF signals are sent to the BBU for further processing.
2 weeks ago by edited 2 weeks ago by
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