IDEA-PPT

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An idea about : 

3-Apr-11 1 An idea about

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Idea was launched in year 1997 as Birla AT&T in two circles. Maharashtra . Gujarat. At present time it exists in 18 circles. 3-Apr-11 2 History:

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Idea group was inspired by -Mr.G.D Birla -Mr. B.K Birla -Mr. Aditya Birla -Mr.Kumar Mangalam Birla At present CEO of the company is Mr.Kumar Mangalam Birla. CTO of the company is Mr.Anil Tandon. Idea is a PAN India company. 3-Apr-11 3 About IDEA:

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3-Apr-11 4 Departments:

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3-Apr-11 5 Deedwana GPRS GSM Structure Of GSM Network:

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3-Apr-11 6 GSM Architecture

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Planning is done to know about the city and our business aspects. There are few points which we have to keep in consideration while planning a site:- Population. Financial status. Coverage area. No. of end users. Available resources. Geographical aspects. Environment. Traffic. 3-Apr-11 7 Cell Planning

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3-Apr-11 8 A Cell A cell is the basic unit of a cellular system and is defined as the area of radio coverage given by one BTS antenna system.

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3-Apr-11 9 A nominal cell plan is designed on the basis of the factors defined in previous slide and it forms the basis of the further planning. After this clusters of cells are formed,having group of frequencies which are used only once so that there is no problem of intereference in the neighbouring clusters.

Channels : 

3-Apr-11 10 Channels

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3-Apr-11 11 Radio Frequency Carriers. What are Channels? Types Of Channels. Contents:

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3-Apr-11 12 Radio frequency Carriers: There are four frequency band:- 800 MHz 900 MHz 1800 MHz 1900 MHz In Asia Continent 900 and 1800 frequency band is used.

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3-Apr-11 13 Radio frequency Carriers: Spectrum Band For GSM 1800 Band: For this band there are 374 pairs. All telecommunication service provider operate in this band. DOWNLINK UPLINK 1710 1785 1805 1880 In 75 MHz there is band 374 spectrum and its range is 512 to 886. In this spectrum range idea has 6.2 MHz & it has 31 spectrum pair and its range is 530 to 560.

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3-Apr-11 14 Channels: A channel is a frequency or set of frequencies which can be allocated for the transmission, and possibly the receipt, of information. Communication channels are of following types:-

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3-Apr-11 15 Channels: What is Duplex? The duplex channel use in mobile, uses two frequency One to the MS. One from the MS. These two frequency operate in two way:- UpLink. DownLink

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3-Apr-11 16 Types Of Channels: Downlink Downlink Downlink Uplink For Mobile System

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3-Apr-11 17 Control Channels: When an MS is switched on, it searches for a BTS to connect to. The MS scans the entire frequency band, or, optionally, uses a list containing the allocated carrier frequencies for this operator. When the MS finds the strongest carrier, it must then determine if it is a control channel. It does so by searching for a particular logical channel called Broadcast Control Channel (BCCH). A frequency carrying BCCH contains important information for an MS, including e.g. the current LA identity, synchronization information and network identity. Without such information, an MS cannot work with a network.

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3-Apr-11 18 Channels: BCH: BROADCAST CHANELS. FCCH: FREQUENCY CORRECTION CHANNELS. SCH: SYNCHRONIZATION CHANNELS. BCCH: BROADCAST CONTROL CHANNELS.

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3-Apr-11 19 BCH:

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3-Apr-11 20 CCCH: CCCH: COMMAN CONTROL CHANELS. PCH: PAGING CHANNELS. RACH: RANDOM ACCESS CHANNELS. AGCH: ACCESS GRANT CHANNELS. When the MS has finished analyzing the information on a BCH, it then has all the information required to work with a network. However, if the MS roams to another cell, it must repeat the process of reading FCCH, SCH and BCCH in the new cell. If the mobile subscriber then wishes to make or receive a call, the Common Control Channels (CCCH) must be used.

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3-Apr-11 21 CCCH:

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3-Apr-11 22 DCCH: DCCH: DEDICATED CONTROL CHANELS. SDCCH: STAND ALONE DEDICATED CHANNELS. SACCH: SLOW ASSOCIATED CONTROL CHANNELS. FACCH: FAST ASSOCIATED CONTROL CHANNELS. CBCH: CELL BROADCAST CHANNELS At this stage the MS and BSS are ready to begin call set-up procedures. For this the MS and BSS use Dedicated Control Channels (DCCH's).

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3-Apr-11 23 DCCH:

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3-Apr-11 24 Traffic Channels: Once call set-up procedures have been completed on the control physical channel, the MS tunes to a traffic physical channel. It uses the Traffic Channel (TCH) logical channel. There are two types of TCH: Full rate (TCH): transmits full rate speech (13 kbits/s). A full rate TCH occupies one physical channel. 2. Half rate (TCH/2): transmits half rate speech (6.5 kbits/s). Two half rate TCH's can share one physical channel, thus doubling the capacity of a cell.

Call Flow : 

3-Apr-11 25 Call Flow

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3-Apr-11 26 Call Flow: Mobile System 1 Mobile System 2 Communication Channels

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3-Apr-11 27 NPU MMU-1 MMU-2 TN FMS Feeder Cable IF Cable 2P BTS Unit GSM Antenna MW Antenna

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3-Apr-11 28

Thank You : 

3-Apr-11 29 Thank You

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