Base Station

Base station namely public mobile base is a form of radio stations, it is to point to in certain radio covering area, through the mobile communication exchange centre, and mobile telephone terminal of information between relay radio transceivers letter station.

Basic definition

The generalized base station, is the abbreviation of base station subsystem. With the GSM network as an example, including base station transceiver letter machine (BTS) and base station controller (BSC). A base station controller can control dozen that dozens of base station transceiver letter machine. While in WCDMA system, similar concept called NodeB and RNC.

Narrow base station, namely public mobile base is a form of radio stations, it is to point to in certain radio covering area, through the mobile communication exchange centre, and mobile telephone terminal of information between relay radio transceivers letter station.

Base station by mobile operators application Settings.

Composition composition

A base station choice, need from the performance, the supporting, compatibility and the application requirements and so on various aspects, including comprehensive consideration of the special attention is base station equipment must be compatible with the mobile switching center or form a complete set, so can better communication effect. Base station subsystem of equipment: mainly includes two base station transceiver machines (BTS) and base station controller (BSC).

Base station transceiver Taiwan

You often see the roof tall antenna, is part of the base station transceiver sets. A complete base station transceiver platform including wireless transmitting/receiving equipment, antenna and all wireless interface peculiar signal processing parts. Base station transceiver sets can be regarded as a wireless modem, responsible for moving signal receiving, send processing. Usually in an area, multiple subinterfaces stations and mutual composed of a honeycomb transceiver platform of network, through controlling transceiver platform and the platform between signal mutual transceiver and send and receive to achieve mobile communication signal transmission, the limits of area namely we often say network coverage. If have no transceiver Taiwan, it is impossible to finish the sending and receiving phone signal. Base station transceiver Taiwan cannot areas covered by mobile phone signal is blind alleys. So base station transceiver Taiwan emitting and receiving signal range directly related to network signal quality and mobile phone whether can in this area of normal use.

Base station transceiver Taiwan under the control of the base station controller, finish of the base control and a radio channel conversion between, realize the mobile communication transceiver and mobile platform signal between through air wireless transmission and related control functions. Transceiver platform it can for each user wireless signal decoding and distribution.

Stations use the antenna into transmit antennas and receiving antenna, and have all the points to and orientation, general but has the following three ways: send omnidirectional configuration, receive complete to way, Hair omnidirectional and accept directional way, Hair orientation, accept directional way. Literally every means we can understand the different, hair omnidirectional mainly responsible for all-round signal transmission, To receive complete natural is a position of received signal, Directional means only toward a fixed Angle to send and receive. Under normal circumstances, the channel number less bs (such as a suburban) is often used to send omnidirectional, receive complete to ways, and several more stations using channel omnidirectional, receive send directional way, and the establishment of the suburban base more than dense.

Due to the base station transmission signal may weak, and has certain signal interference, so will the primary device module filter and amplification, dual frequency conversion, amplify and popularly used processing. Input the high frequency signal after enlargement into first transducer, provide first the machine by inverter frequency of the oscillating signal 766.9125-791.8875 MHz, down-transducer generated after 123.1 MHz first intermediate frequency signal. The first mid-frequency signal through enlargement, filtering, frequency mixing generated after the second mid-frequency signal (MHz), it 21.3875 amplified, filtered to intermediate frequency of manifold blocks. By intermediate frequency integrated blocks (including second mid-frequency signal amplifiers, the limiter and popularly used device) to create the audio output signal and receiving signal strength instructions RSSI) to signal (audio/control panel, in audio signal control board inside, constantly compared by diversity switch the odd and even signal, and then choose one of strong signal, through audio circuits teleport to mobile control center.

Base station transmitter working principle is: by frequency synthesizer provided for 766.9125-791.8875 MHz frequency of the signal and the 168.1 software-processable MHz already adjustable signals, respectively by filtering into double balance inverter, and obtain frequency for 935.0125-959.9875 MHz of rf signal, the rf signal by filter and amplification again into the driver stage, driver stage the output power of approximately 2.4 W, then add to power amplifier module. Power control technology of negative feedback circuit adopts automatic adjustment lead driver stage or push level of output power to make driver stage output power to remain in the ratings. Just putting received signals are sent out, so stable again can effectively decrease or avoid communication signals in the wireless transmission of losses, ensure the quality of network users. Power amplifier module is the function of the signal amplifier to 10W, but this is according to the actual condition and decide, if the area is larger, the radius of the signal can be adopted 25W or 40 w amplifier module, in order to enhance signal sent radius.

Base station controller

Wireless transceiver base station controller including letter machine, antenna and relevant signal processing circuits etc, it is base station subsystems control section. Mainly includes four parts: minispot sin (CSC), voice-grade channels controller (VCCS), signaling channel controller (SCC), and used to expand more LuDuan interface (EMPI). A base station controller usually controls several base station transceiver platform, through the mobile station transceiver platform and the remote commands, base station controller is responsible for all mobile communication interface management, mainly is a radio channel of distribution, release and management. When you use a mobile phone, it is responsible for you to open a signal channel, call end it this channel closing, leaving with others. Besides, this control zone mobile station handoff is controlled. If you use cell phones when stepping into another base station signal transceiver range, controller and responsible in another base station, and switch between keep always with mobile switching center connection. Base station

GSM system by switching the marker way, namely when the user arrive village border, the mobile phone will first with the original base station, then cut off contact with new service area base to establish contact, when the new service area busy, cannot provide calls at channel, will occur dropped phenomenon. Therefore, users in the use of cell phone when, should avoid to be in use, in order to reduce the blind corners call dropped probability.

Controller that is the core of exchange network and public processor (CPR). Public processor for internal control module controller management, and through x.25 communication protocol and the operation and maintenance center (OMC) connections. Exchange network will complete interface and interfaces between 64kbit/s data/voice business channel internal exchange. Controller through the interface device number Repeaters (DTC) and mobile exchange center is linked together, through the interface terminals controller (TCU) and transceiver sets are linked together, form a simple communication network.

Throughout the cellular mobile communication system, mobile platform and the base station subsystem is mobile center provides the bridge, their status is extremely important. The whole covering area of the base amount, the position in cellular base station village, base station subsystems in related components of work performance factors determine the whole cellular system of communication quality. Base station selection and construction, has become the form of modern mobile communication network is important one annulus.