3 g

SEMINAR ON THIRD GENERATION MOBILE TECHNOLOGY Presented by Roopesh.K Roll.No: 7

INTRODUCTION ,[object Object]

3G STANDARDS ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

GSM GSM is the most popular standard for mobile phones in the world Its ubiquity makes international roaming very common between mobile phone operators , enabling subscribers to use their phones in many parts of the world. GSM differs from its predecessors in that both signaling and speech channels are digital , and thus is considered a second generation ( 2G ) mobile phone system. ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],( Global System for Mobile communications)

Cellular radio network ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Network structure ,[object Object],[object Object],[object Object]

Subscriber Identity Module (SIM) ,[object Object]

EDGE ( Enhanced Data rates for GSM Evolution ) ,[object Object],[object Object],[object Object],[object Object]

CDMA2000 ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Access schemes For radio systems there are two resources, frequency and time. Division by frequency, so that each pair of communicators is allocated part of the spectrum for all of the time, results in Frequency Division Multiple Access (FDMA). Division by time, so that each pair of communicators is allocated all (or at least a large part) of the spectrum for part of the time results in Time Division Multiple Access (TDMA). In Code Division Multiple Access (CDMA), every communicator will be allocated the entire spectrum all of the time. CDMA uses codes to identify connections.

UMTS (Universal Mobile Telecommunications System ) ,[object Object],[object Object],W-CDMA (UTRA-FDD) W-CDMA uses the DS-CDMA channel access method with a pair of 5 MHz channels. In contrast, the competing CDMA2000 system uses one or more arbitrary 1.25 MHz channels for each direction of communication. W-CDMA systems are widely criticized for their large spectrum usage, which has delayed deployment in countries that acted relatively slowly in allocating new frequencies specifically for 3G services (such as the United States). ,[object Object],[object Object],[object Object],UTRA-TDD HCR UMTS-TDD's air interfaces that use the TD-CDMA channel access technique are standardized as UTRA-TDD HCR, which uses increments of 5 MHz of spectrum, each slice divided into 10ms frames containing fifteen time slots (1500 per second). The time slots (TS) are allocated in fixed percentage for downlink and uplink. TD-CDMA is used to multiplex streams from or to multiple transceivers. Unlike W-CDMA, it does not need separate frequency bands for up- and downstream, allowing deployment in tight frequency bands. TD-CDMA is a part of IMT-2000 as IMT CDMA TDD. TD-SCDMA (UTRA-TDD 1.28 Mcps Low Chip Rate) TD-SCDMA uses the TDMA channel access method combined with an adaptive synchronous CDMA component on 1.6 MHz slices of spectrum, allowing deployment in even tighter frequency bands than TD-CDMA. However, the main incentive for development of this Chinese-developed standard was avoiding or reducing the license fees that have to be paid to non-Chinese patent owners. Unlike the other air interfaces, TD-SCDMA was not part of UMTS from the beginning but has been added in Release 4 of the specification. Like TD-CDMA, it is known as IMT CDMA TDD within IMT-2000. Interoperability and global roaming UMTS phones (and data cards) are highly portable—they have been designed to roam easily onto other UMTS networks (assuming the providers have roaming agreements in place). In addition, almost all UMTS phones are UMTS/GSM dual-mode devices, so if a UMTS phone travels outside of UMTS coverage during a call the call may be transparently handed off to available GSM coverage. Roaming charges are usually significantly higher than regular usage charges.

DECT ( Digital Enhanced Cordless Telecommunications ) ,[object Object],[object Object],[object Object]

WiMAX (Worldwide Interoperability for Microwave Access ) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

OVERVIEW OF 3G ,[object Object],[object Object],[object Object],[object Object],[object Object]

FEATURES ,[object Object],[object Object],Security 3G networks offer a greater degree of security than 2G predecessors. By allowing the UE (User Equipment) to authenticate the network it is attaching to, the user can be sure the network is the intended one and not an impersonator.

APPLICATIONS ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

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