What is HLR and VLR and its function in GSM

As From the Name VLR means Visitor Location Register and HLR means Home Location Register so it has all detail of subscriber so VLR has temporary details. Let’s check in...
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How Adaptive Multi-Rate Codec (AMR) work in GSM ?

Adaptive Multi-Rate (AMR) codec consists of a family of codecs (source andchannel codecs with different trade-off bit-rates) operating in the GSM FRand HR channels modes The AMR system exploits the...
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adaptive, amr, CHANNEL, coding, fr, gsm, hr, lte, multi, quality, radio, rate, speech

Dedicated Control Channel (DCCH) in GSM

SDCCH (Stand-alone Dedicated Control Channel) Uplink and Downlink. Used for call setup, authentication, ciphering location update and SMS. SACCH (Slow Associated Control Channel) Downlink and Uplink. Used to transfer signal...
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call setup, cell, control channel, dcch, dcch control channel, downlink, forward link, gsm, lte, power control, reverse link, sacch, sdcch, timing advance, uplink

How Many Broadcast Channels & what’s it work in GSM ?

BCCH(Broadcast Control Channels) Downlink Only. Broadcast information of the serving cell (System Information). Transmitted on timeslot zero of BCCH carrier. Read only by idle mobile at least once every 30...
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BCCH, bsic, carrier, cell, CHANNEL, code, downlink, frame, frequency, gsm, idle, information, lte, mobile, SCH, system

Basic Work of MSC (Mobile Switching Centre)

Exchange where calls are established, maintained and released Database for all subscribers and their associated features. Communicates with the BSCs on the A interface and with PSTN on fixed line....
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a interface, bsc, call, communicate, database, features, gsm, lte, msc, subscribers, support

Advantages of Intelligent Network (IN)

Concept of Intelligent Network: The introduction of new services and access to the GSM service are based on the concept of Intelligent Network (IN). This is because of the independence...
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Intelligent Network (IN), Advantages of Intelligent Network, Mobility management, radio frequencies, radio control, GSM serversadvantage, conventional call, dedicated, gsm, in, intelligent, lte, managed, network, server, vlr

Specifications of WCDMA

Channel Bandwidth  5 MHz Duplex Mode  FDD and TDD Downlink RF Channel Structure  Direct Spread (DS) Chip Rate  3.84 Mcps Frame Length  10 ms Spreading Modulation  Balanced QPSK (downlink) Dual-channel...
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cdma, cell, downlink, multiplex, power control, qpsk, rf channel, tdd downlink, telecom, uplink

Main Characterictics of WCDMA

Support two basic modes: FDD and TDD modes High chip rate (3.84 Mcps) and data rates (up to 2 Mbps) Employs coherent detection on uplink and downlink based on the...
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Main Characterictics of WCDMAcdma, cell, data, downlink, fast, fdd, frequency, gsm, packet, power control, tdd, telecom, uplink, WCDMA / 3G

E-UTRAN (Evolved Universal Terrestrial Radio Access Network)

Role of Radio Access Network (RAN), namely NodeB and RNC is replaced with ENB, so as to reduce operational and maintenance cost of the device other than the simpler network...
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enodb, enodeb, eutran, node, radio, telecom

Ranging in Wimax

Since each MS has a unique distance from the base station, it is critical in the uplink to synchronize the symbols and equalize the received power levels among the various...
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active, cdma, cell, downlink, intersymbol interference, power control, ranging, ranging in wimax, symbols, telecom, uplink

What are the Advantages of OFDMA in Wimax ?

 OFDMA is essentially a hybrid of FDMA and TDMA: Users are dynamically assigned subcarriers (FDMA) in different time slots (TDMA) . The advantages of OFDMA start with the advantages of...
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access, cell, fdma, frequency diversity, ofdm, ofdma, subcarrier, tdma, telecom, uplink, user

The Difference Between Line Of Sight and Non-Line Of Sight

Earlier wireless technologies (LMDS, MMDS for example) were unsuccessful in the mass market as they could not deliver services in non-line-of-sight scenarios. This limited the number of subscribers they could...
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3g, antenna, broadband, difference between, fixed, point, solution, system, telecom, wifi, Wimax

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