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A mobile network

A cellular network is a radio network made of quantity of radio cells, each severed by set positioned based place. These cells stations cover several different areas and offer large radio coverage. For this to occur a variable number of portable transceivers can be used in virtually any cell and shifted through one cell during transmission. The use of multiple cells means that if the sent out transceivers are mobile and moving from one indicate another point they should change also from cell to cell. This mechanism could vary in line with the type of network and change of circumstances. In this case clear coordination between base station and mobile place is must in order to avoid communication interruption.

The most common example of cellular Network is a cell or mobile phone, which really is a portable telephone that may be dialled or will get calls through foundation station or transmitting tower. Radio waves copy sign to and from cellular phone. The coverage area of service provider sometime is split into small cells in order to prevent signal loss and also a large number of active phones in the area. The number of indicators could be different in towns and rural areas. All foundation stations are connected to cellular phone switches centre, which connect to a general population telephone network or even to another mobile company swap. As the mobile consumer steps in one cell area to some other cell, the transition automatically orders the handset and a cell site with a stronger indication (reported by each handset) to switch to a fresh radio route (consistency). If the handset responds through the new cell site, the exchange switches the connection to the new cell site.

Modern cell phones networks use cell as radio frequencies are limited, distributed resource, base stations and handsets change occurrence and use low vitality transmitters in order that limited volume of radio occurrence can be used at exactly the same time by many users with less interferences.

To distinguish indicators from a types of different transmitters, rate of recurrence division multiple access (FDMA) and code department multiple gain access to (CDMA) has been developed.

Advantage of mobile Network over other choice solutions is:

Increase capacity.

Power usage reduced.

Huge coverage area.

Interference from other signs reduced.

Reference paper 10

The evolution of the cellular Network began to flourish over the last years in which several different systems were developed; as a result we have first era (1G), second technology (2G), third generation (3G) cellular sites and the trend is continually increasing. The first era (1G) was used from 1970-1980 and now is retired. In 1990 the second generation (2G) of Sites were launched such as Global System for Mobile marketing communications (GSM), Personal Marketing communications Service (PCS), and Integrated Digital Enhanced Network (IDEN) and so forth. The second technology (2G) of networks replaced the (1G) and became very popular with digital processing, enabling wireless transmission of words as well as data and also have different Variety of new features like a Push to Speak, Short Messaging service(SMS), caller Identification, conference calling, voice email, email messaging etc.

After the ongoing success of 2G, providers to respond to the worldwide demand of the quickness tendency, they developed a robust interim technology of cellular Networks which is the two 2. 5G such as Basic Packet Radio Service (GPRS), Enhanced Data Rates for GSM Advancement (EDGE), High-Speed Circuit-Switched Data (HSCSD) and so forth. This upgrade increase bandwidth had a need to support a diverse variety of new applications including large email messages resourceful web browsing, navigation, basic multimedia system faxing and various data at typical dialup quickness. This era of network become popular and supported many firm's workers. Carriers continuously rivalling to include further advancement to the new era of Sites and from consequently we have the 3rd generation (3G) with an increase of bandwidth to DSL with selection of 144 Kbps to 2+Mbps are produced to provide support to get more demanding multimedia system applications such as training video conferencing, voice over (VOIP), full motion video and loading music to support television programs (satellite tv radio) and faster document downloads.

GSM

IT is standard mobile phone system used across European countries and created in 1982. Global system for mobile communication (GSM) is one of the next generation (2G) of mobile Networks marketed by the GSM relationship, became typically the most popular standard cellular phone on the globe with over 3 billion customers in more than 212 countries. GSM is a cellular Network and this means that mobile phones connect to it by searching for skin cells or nearest site. GSM has five different cell sites and its presents almost everywhere makes international roaming quite typical between phones operator; also allow mobile users to work with their device in many parts of the entire world and change providers without changing telephones. Alternatively GSM benefits Network operators who have the opportunity to choose equipment from any worldwide suppliers using GSM.

Features of GSM are:

Low cost option to voice telephone calls.

Text messaging.

Worldwide emergency phone number (112/999), which connects international holidaymakers to disaster service without knowing the neighborhood emergency service number.

The GSM standard improved their services adding the general pocket radio service (GPRS), higher quickness data transmission using increased data rates for GSM advancement (Advantage).

GSM Network operates in several different frequency ranges with continuously enhanced full rate coder-decoder (CODEC). Among the key top features of GSM is the SIM credit card or subscriber identification model, which contains the user's subscription information and telephone book.

Finally the GSM system and service are governed by ETSI standard, which is a Western european telecommunication service institute.

BTS

BSC

MSC

GMSC

VLR

HLR

Access Network

MS

BSS

SMSS

OMC

EIR

AUC

OMSS

ISDNPSTN

GSM Sub Systems architecture

GSM is a part of 2nd Generation systems. GSM's goal was to give a circuit switched telephony service to mobile users. GSM uses Time Department Multiple Gain access to. GSM has an alternative central network than 2. 5 Technology and 3rd Technology infrastructure. The Synchronous Digital Hierarchy (SDH) or Synchronous Digital Network (SONET) criteria provide a standard transmission lines in fixed contacts as like from BSS to SMSS interfaces. Inside of the center network, Mobile Software Part signalling (MAP) can be used.

Functionality of varied Modules of the GSM System

There are three subsystems in GSM network. These are:

Base Place Subsystems (BSS)

Switching and Management Subsystems (SMSS)

Operation and Maintenance Subsystems (OMSS)

Base Station Subsystems (BSS)

In GSM systems, the access network plays an essential role to hook up terminals to the network. The access network BSS is linked to the core network. The main reason for BSS is to set the connection between a Mobile Stop and the bottom Place. The first component of a BSS network is the bottom Transceiver Station (BTS), which is in charge from air user interface and making a bridge between your network and the Mobile Station (MS). The second component is the bottom Stop Controller (BSC), which is liable from all the Base Transceiver Stations (BTS). Simply it is sensible to allocate and release programs at air user interface. Base Stop Subsystems are linked to SMSS and OMSS.

Switching and Management Subsystems (SMSS)

SMSS is divided into two components. These are Mobile Switching Centre (MSC) and Gateway Mobile Switching Centre (GMSC). MSC is accountable for all the bottom stations which are linked onto Mobile Turning Centre (MSC) over Base Place Controller (BSC). The GMSC is in charge from the external fixed network collection. Whenever there's a phone call, it comes in or goes out from GMSC. All the incoming telephone calls are aimed to Home Location Register (HLR) to detect and appearance at the profile of subscriber in order to ascertain if the customer is able to make a phone call or not. If the decision is accepted it goes to MSC, then from MSC the decision switches into Visitor Location Register (VLR), VLR is aware of the location of mobile channels. Simply we can say that the VLR is in charge from the access network and also from MSC too.

Operation and Maintenance Subsystems (OMSS)

Operation and Maintenance Subsystems (OMSS) is mainly responsible for the security of the network. For instance, if the phone is stolen or if the subscriber didn't pay his charge. One of the important data bases in OMSS are Equipment Personality Register (EIR) and the Authentication Centre (AUC).

Ref 11 wiki

Universal mobile telecommunications system (UMTS)

Universal mobile telecommunications system (UMTS) is one of the 3rd generation (3G) mobile telecommunication systems, which is also being designed in a (4G) technology. The name UMTS is launched by ETSI and is also usually used in Europe but adjust other names beyond your continent, instructed by 3GPP and it is an integral part of a worldwide ITU IMT-2000 Standard. The most common form of UTMS Network uses Wideband Code Section Multiple Gain access to (IMT direct pass on) as the root air interface. The theory that lays behind the UMTS is to create a network aspect which is near GSM/GPRS and to have the ability to operate under this existing GSM/GPRS Network (GERAN). UMTS comes with an additional Access Network to GERAN. All of the components in this new access network are totally different than the components in GERAN gain access to network. As it is mentioned before UMTS can work with both Circuit Swap (2G) and Packet Turn website (2. 5G & 3G), therefore there are two access sites. One of these is called Radio Access Network (GERAN) and the second one is named UMTS Terrestrial Gain access to Network (UTRAN).

Showing UTRAN infrastructure

 

The GSM network is a circuit turned network, which means, that there are no IP, high data rate or media messages. UTRAN is a packet switched network, where everything is based on Ip, high data rate and a great many other facilities can be found. In GSM infrastructure, we've acquired a Mobile Train station (MS), Base Transceiver Train station (BTS) and Basic Train station Controller (BSC). But this infrastructure is completely different in UTRAN infrastructure. In UTRAN, there is certainly customer equipment (UE) which is the same as Mobile Place in GERAN/BSS. Another element is Node B (NB). The Node B is the base stop as BTS which Node B (NB) is controlled by Radio Network Controller (RNC). RNC is equivalent to BSC in GERAN/BSS. The main variations are higher data rates, enhanced security, new protocols and signalization for enhanced service factors. These are all provided by the new components in an gain access to network of UTRAN/RNC.

UMTS there are two core sites and two gain access to networks. The advantage of UMTS is that it's very adaptable. UMTS facilitates both circuit switch and Packet Switch Networks. One core network is designed for CS website and the other the first is designed for PS domain. Circuit switch is perfect for the old generation mobiles but nonetheless in use. CS domain is not based on IP; we can simply say that CS website is needed for GSM network. Packed move domain is dependant on internet protocol (IP) and has different new protocol and signalling. PS domain enables high speed data rate consequently of this is the fact video messaging and each one of these other internet based and broadband data rates can be obtained. PS domain is needed for GPRS and UMTS. In UTRAN/RNS, individual wants to produce a call. In this case an individual equipment (UE) searches for the nearest Node B and sets the connection. Once the connection is set the call is transferred from Node B (NB) to Radio Network Controller (RNC), From RNC the decision goes to PS domain Central Network in GERAN/BSS. Mobile Train station (MS) looks for the nearest Bottom Transceiver Station (BTS) and from here the MS is aimed to BSC, if the call is IP based mostly from BSC then your call will be directed to PS website key network, if the call is not IP established than it goes to CS Domain center network.

UMTS Stop Architecture

Iub - This software happens between your Node B and RNC. RNC is using I-ub interface to control a number of Node B. The I-ub interface is standardized software; gleam signalling protocol which uses NBAP.

Iur - This user interface happens between your Radio Network Controllers (RNC). Iur helps the RNC to complete its information or data to some other RNC. Following this process, an individual equipment is transferred to new RNC; the signalling protocol uses Radio Network Customer Application part (RNSAP).

There are two Iu software for both PS and CS center sites, one for Iu CS a different one is made for Iu PS.

Iu CS - This program happens between UTRAN/RNS and the circuit move core network domain. Iu-CS carries tone and signalling between UTRAN/RNS and PS domain name main network. The signalling protocol is named RANAP.

Iu PS - This interface happens between UTRAN/RNS and the packet move core network website. This primary network is made for UMTS and GPRS. Iu-PS bears tone and signalling between UTRAN/RNS and PS area core systems. The signalling protocol is RANAP.

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