By Vern A. Dubendorf
ISBN-10: 0470849495
ISBN-13: 9780470849491
The growth and recognition of the web, besides the addition of instant info performance to instant networks, has additionally contributed significantly to the expansion of the instant undefined. in reality, the predicted buyer call for for prime bandwidth instant facts is usually visible because the motive force at the back of present community improvements and expansions. The quantity and kinds of businesses aggressively making an investment in instant applied sciences illustrate the significance of instant facts. Non-traditional telecommunications businesses reminiscent of Cisco platforms, Intel, Microsoft, 3Com, and different expert providers businesses, are making an investment seriously in instant product improvement and plenty of have shaped partnerships with instant infrastructure brands to aid convey instant info companies seamlessly to consumers.Written through a revered writer this self-contained review of instant date applied sciences will supply a hugely wanted technical connection with all these operating in the major parts of instant information providers. * offers a self-contained reference which discusses the main instant applied sciences together with safety * provides an summary of the instant and its key parts corresponding to GSM, GPRS, CDMA, TDMA, UMTS, cdma2000, and unfold Spectrum, 802.11, 15 and sixteen criteria * Discusses the at the moment scorching subject of instant safety * incorporates a Foreword through Dr invoice Hancock, leader defense Officer, Exodus Communications/Cable & instant * presents a prepared reference in addition to a connection with extra fabrics on every one subject crucial examining for all employees operating for Telecom businesses: engineers, researchers, managers and so forth.
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Extra resources for Wireless Data Technologies
Sample text
A GSM network can be divided into three groups (see Fig. 2): The mobile station (MS), the base station subsystem (BSS) and the network subsystem. 1 The Mobile Station (MS) A mobile station may be referred to as a ‘handset’, a ‘mobile’, a ‘portable terminal’ or ‘mobile equipment’ (ME). It also includes a subscriber identity module (SIM) that is normally removable and comes in two sizes. Each SIM card has a unique identification number called international mobile subscriber identity (IMSI). In addition, each MS is assigned a unique hardware identification called international mobile equipment identity (IMEI).
The data rate will always be 1200 bps. 667 ms, which is equal to the period of the short 24 MULTIPLE ACCESS WIRELESS COMMUNICATIONS code. This makes finding frame boundaries much easier once the mobile has located the pilot. The timing and system configuration information is sent to the mobile station in the Sync Channel using a repeating message. The mobile station can calculate accurate system time by synchronizing to the short code. 667 ms. The short code period ambiguity is then resolved by the long code state and system time fields that are also part of the sync message.
Hardware redundancy and intelligent error detection mechanisms help prevent network downtime. The OMC is responsible for controlling and maintaining the MSC, BSC, and BTS. It can be in charge of an entire public land mobile network (PLMN) or just some parts of the PLMN. 3 Interfaces and Protocols Providing voice or data transmission quality over the radio link is only part of the function of a cellular mobile network. A GSM mobile can seamlessly roam nationally and internationally, requiring standardized call routing and location updating functions in GSM networks.