tài liệu gsm vietel

... 3.6. MICROCELLULAR GSM NETWORK 183 frequency hopping and DTX on system performance, and the role of sectorisation. 3.6 Microcellular GSM Network High densities of teletraffic ... start-up phase. Systems having the luxury of wide bandwidth allocation, such as GSM1 800 (i.e. DCS1800) and some GSM1 900 (i.e. PCS1900) systems, may have up to 10 carriers per sector if there is ... BS. 154 CHAPTER 3. CAPACITY OF GSM SYSTEMS parameters, e.g. DTX and FH, used in the macrocellular analysis apply. After calculating the SIR the capacity of the microcellular GSM network is computed....

Ngày tải lên: 14/12/2013, 23:15

... 1050, 1075, 1100, 1125, 1150, 1175 Chapter 4 The cdmaOne System 4.1 Introduction In contrast to the GSM system, which was designed and developed by a number of different organisations working together, ... world. At this point it is important to clarify the terminology we shall be using in the remainder 205 GSM, cdmaOne and 3G Systems. Raymond Steele, Chin-Chun Lee and Peter Gould Copyright © 2001 John ... battery life. This process is very similar to the discontinuous reception technique (DRX) employed by GSM. The system also supports a ‘non-slotted paging’ mode whereby an MS is required constantly to...

Ngày tải lên: 14/12/2013, 23:15

... E b = I 0 f ( r ) PDFofanMSbeinginaringofarea2πrdr f ( r j = r  σ ) expectation of 10 ζ = 10 with the constraint function φ ( ζ  r = r j ) 285 GSM, cdmaOne and 3G Systems. Raymond Steele, Chin-Chun Lee and Peter Gould Copyright © 2001 John...

Ngày tải lên: 14/12/2013, 23:15

... schemes are different for 416 CHAPTER 6. EVOLUTION OF GSM AND CDMAONE TO 3G SYSTEMS Application IP/X.25 SNDCP LLC GSM RF MAC RLC MS Um Relay RLC MAC GSM RF BSSGP Network Services L1 bis Relay SNDCP LCC BSSGP Network Services L1 ... became GSM, and a brief history of GSM has already been provided in Section 2.1. The Europeans have a long view in cellular radio and in 1988 they launched their RACE 1043 project with 404 GSM, ... (Single Carrier). This is essentially a particular manifestation of GSM Phase 2+, known as EDGE, standing for Enhanced Data Rates for GSM Evolution.  IMT FT (Frequency Time). This is the digitally...

Ngày tải lên: 14/12/2013, 23:15

... actual GSM world was quite minimal: Due to the late timeframe, O&M systems unaffected by the new standards were largely up and running throughout the GSM world. 18.4 The Elaboration of the GSM ... operators. There was another reason why O&M gained more attention as GSM started growing. The analogue networks existing before GSM were quite small and not much effort was required for monitoring ... O&M staff. But the larger GSM networks soon had thousands of base stations, all of which sent out alarms, created performance data and needed configuration. GSM and UMTS: The Creation of Global...

Ngày tải lên: 15/12/2013, 05:15

... the ETSI secretariat. GSM and UMTS: The Creation of Global Mobile Communication458 19.2.1 Consolidation of GSM Phase 1 In the years 1989–1992, the main focus of activities in GSM and PT12 was the ... Introduction of GSM Phase 2 The need to introduce GSM in phases had already been recognized before 1990. Some features had been deferred rather early to phase 2, for example: GSM and UMTS: The ... period, GSM grow up with breathtaking speed, in terms of users, of countries to introduce GSM, of networks, of variety of services offered to the users and of applicable frequency bands, and the GSM...

Ngày tải lên: 15/12/2013, 05:15

... consistent. GSM and UMTS: The Creation of Global Mobile Communication470 14 See TDoc GSM 222/88. 15 See TDoc GSM 482/89 rev2. 16 Cf. for example TDoc GSM 222/88 and TDoc GSM 227/88 at GSM# 20. 17 See ... that a coordinating committee should be established. Cf. also TDoc GSM 51/87, TDoc GSM 107/87, TDoc GSM 96/88, TDoc GSM 222/88 and GSM# 21 Report, Section 8. ... change specifications: † GSM# 20 agreed that consolidations of the GSM specifications were to be carried out only by means of the CR procedure. † GSM# 21 defined four CR categories. † GSM# 27 clarified that...

Ngày tải lên: 15/12/2013, 05:15

... the GSM MoU was the development and globalisation of GSM, incorporating not only GSM 900 but also DCS 1800 and PCS 1900 operation. GSM was still in its operational infancy, so why did the GSM ... players/ Chapter 21: The Contribution of the GSM Association to the Building of GSM and UMTS 527 Chapter 21: The Contribution of the GSM Association to the Building of GSM and UMTS Section 7: The Third ... is: † Licensed mobile network operators committed to building and implementing GSM based systems. This includes GSM 900, GSM 1800, GSM 1900, 3G network operators and satellite operators. † Government regulators/administrations...

Ngày tải lên: 15/12/2013, 05:15

... global GSM/ UMTS communications. Venezuela, with GSM in 900 MHz, is considering the possi- bility of deploying GSM1 .8 GHz in combination with the IMT2000 core-band/UMTS. So the wide adoption of GSM ... energetic construction and expansion of GSM networks. Every GSM MoU signatory had an operational GSM network in mid-1994. In Western Europe the number of GSM subscribers passed the number of analogue ... 2.2 million GSM users by the end of 2000. GSM and UMTS: The Creation of Global Mobile Communication534 Table 22.1.2 Large GSM networks in Middle/Eastern Europe Country Start of 2 GSM operators Users...

Ngày tải lên: 15/12/2013, 05:15

... global acceptance of GSM. The very fast evolution of GSM even towards third generation (UMTS) made GSM/ UMTS the most future proof solution world-wide leading to a market share of 69%. 23.3 GSM s Superior ... hand-helds. GSM s superior security and anti-fraud measures protect the users privacy and the oper- ator’s revenue. GSM is an open standard, that is not dominated by the IPR of a single manufacturer. GSM ... this a superior set of toolkits for service creation was defined. GSM is the only system allowing a global roaming to all continents. GSM offers an unmatched voice quality due to the basic high quality...

Ngày tải lên: 15/12/2013, 05:15

... code symbols for the next block. This is in contrast to the convolutional encoding schemes used in GSM and on the cdmaOne traffic channel which use encoder tail 246 CHAPTER 4. THE CDMAONE SYSTEM c ... BSs for han- dover and, in this respect, the pilot signal is similar to the BCCH carrier in the GSM system. The MS also uses the pilot channel to estimate what reverse transmitter power it should ... important to note that the cdmaOne system is basically an air-interface standard, in contrast to the GSM system which is specified up to the network gateway. 4.2 The cdmaOne Radio Interface 4.2.1 Operating...

Ngày tải lên: 23/12/2013, 17:15

... E b = I 0 f ( r ) PDFofanMSbeinginaringofarea2πrdr f ( r j = r  σ ) expectation of 10 ζ = 10 with the constraint function φ ( ζ  r = r j ) 285 GSM, cdmaOne and 3G Systems. Raymond Steele, Chin-Chun Lee and Peter Gould Copyright © 2001 John...

Ngày tải lên: 23/12/2013, 17:15

... August 2000, the GSM MoU had 394 members which operated GSM networks in 150 countries (see Figure 1.2). Figure 1.2 illustrates the impressive growth in the number of GSM networks and GSM subscribers. ... Afterward, GSM has also been introduced in Brunei, Cameroon, Iran, South Africa, Syria, Thailand, USA and United Arab Emirates. Whereas the majority of the GSM networks operate in the 900 MHz band (GSM9 00), ... numbers can be obtained from the Web page of the GSM Association at http://www.gsmworld.com. All of these networks have implemented Phase 1 of the GSM standard, or the later de®ned PCN/PCS version...

Ngày tải lên: 23/12/2013, 17:15

... radio network has only a relatively small number of speech channels available. For example, the GSM system has an alloca- tion of 25 MHz bandwidth in the 900 MHz frequency range, which amounts ... that the received power decreases much 2 Figure 2.1: Simpli®ed two-path model of radio propagation GSM Switching, Services and Protocols: Second Edition. Jo È rg Eberspa È cher, Hans-Jo È rg Vo È gel ... multicarrier systems (not to be confused with multicarrier modulation). The pan-European digital system GSM employs such a combination of FDMA and TDMA; it is a multicarrier TDMA system. A frequency range of...

Ngày tải lên: 23/12/2013, 17:15

... installed GSM network can again be subdivided into three subnetworks: the radio network,the mobile switching network,and the management network [21]. These subnetworks are called subsystems in the GSM ... Interfaces 45 Figure 3.11: Con®guration of a GSM PLMN with a VLR for each MSC 3.3.4.2 User Authentication and Equipment Registration Two additional databases are de®ned in GSM besides the HLR and VLR. They ... Data in GSM Besides data of the address type,which is the most important subscriber data of any communication network,a whole series of other service- and contract-speci®c data exists in GSM networks....

Ngày tải lên: 23/12/2013, 17:15

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