A base transceiver station ( BTS ) is a device that facilitates wireless communication between the user's (EU) and network equipment. EU is a device such as a mobile phone (handset), a WLL phone, a computer with wireless Internet connectivity. Networks can be wireless communication technologies such as GSM, CDMA, wireless local loop, Wi-Fi, WiMAX or other wide area network (WAN) technologies.
BTS is also referred to as node B (in 3G Network) or, simply, Base Station (BS). For the discussion of LTE standards, the abbreviation eNB for the widely evolved B node is widely used.
Although the term BTS can be applied to one of the wireless communication standards, it is commonly associated with mobile communication technologies such as GSM and CDMA. In this case, a BTS forms part of the development of base station subsystem (BSS) for system management. It may also have equipment to encrypt and decrypt communications, spectrum filtering tools (band pass filters), etc. Antennas can also be considered as BTS components in general because they facilitate BTS functions. Usually a BTS will have multiple transceivers (TRXs) that allow it to serve several different frequencies and different cell sectors (in the case of sectoral base stations). A BTS is controlled by the host master station controller through the base station control function (BCF). BCF is implemented as a discrete unit or even included in TRX in a compact base station. BCF provides operation and maintenance (O & M) connections to the network management system (NMS), and manages the operational status of each TRX, as well as software handling and alarm collection. The basic structure and functions of BTS remain the same regardless of wireless technology.
Video Base transceiver station
General architecture
A BTS usually consists of:
- Transceiver (TRX)
- Provides signal transmission and reception. It also sends and receives signals to and from higher network entities (such as base station controllers in mobile phones).
- Power amplifier (PA)
- Reinforces signals from TRX for transmission over antennas; can be integrated with TRX.
- combiner
- Merge feeds from multiple TRXs so they can be sent over a single antenna. Allows reduction of the number of antennas used.
- Multiplexer
- To separate send and receive signals to/from the antenna. Does send and receive signal through the same antenna port (cable to antenna).
- Antenna
- This is the structure under the BTS; it can be installed that way or disguised in some way (Hidden cell site).
- Alarm extension system
- Collect work status alarms from various units in the BTS and extend them to operational and maintenance monitoring stations (O & M).
- Control function
- Control and manage various BTS units, including any software. On-the-spot configuration, status changes, software upgrades, etc. Performed through the control function.
- Baseband recipient (BBxx)
- Jump frequency, DSP signal.
Maps Base transceiver station
Terms relating to mobile base stations
- Diversity engineering
- To improve the quality of the received signal, often two receiving antennas are used, placed at equal distances to the corresponding quarter wavelengths. For 900 MHz, this wavelength is 30 cm. This technique, known as antenna diversity or spatial diversity, avoids distractions caused by road fading. Antenna can be placed horizontally or vertically. The horizontal distance requires a more complex installation, but brings better performance.
- In addition to antennas or space diversity, there are other diversity techniques such as frequency/time diversity, antenna pattern diversity, and polarization diversity.
- Separation refers to the flow of forces within a given area of ​​the cell, known as the sector. Each field can be considered as a new cell.
Directional antennas reduce the disturbance of LoRa (Long Range). If not in the sectorization, the cells will be served by omnidirectional antennas, which radiate in all directions. The typical structure is the trisektor, also known as clover, where there are three sectors served by a separate antenna. Each sector has a separate tracking direction, usually 120 Â ° towards adjacent ones. Other orientations can be used to adjust to local conditions. Bisectored cells are also implemented. It is most often oriented to antennas serving the sector of separation 180 ° to each other, but again, local variations do exist.
See also
- OpenBTS
- Mobile ID
- The mobile site
- Cells in the wheel
- Cellular site
- OpenCellID
Further reading
-
Satoshi Maruyama; Katsuhiko Tanahashi; Takehiko Higuchi (2002). Base Transceiver Station for W-CDMA System (PDF) . FUJITSU Sci. Tech. J. p.Ã, 7.
External links
- AS. Patent 6,577,878
References
Source of the article : Wikipedia
0 Comments