Dr.M.N.Narsaiah

Dr. M N Narsaiah had given introduction about what is cellular and mobile communication. He also explained the term “telecommunication” which mean tele is a Greek word meaning “far” and communication is “exchange of information. He also stated that telecommunication is also know as telecom, which is the exchange of information over a large distance. Which include a transmitter and a receiver. The medium of signal transferences can be via various means like fiber, electromagnetic fields, light, cable, etc.

 D r. M N Narsaiah stated few Examples for telecommunication includes: -

• Corporate and academic wide area networks (WANs)
• Telephone networks
• Cellular networks
• Police and fire communication systems
• Broadcast networks

Data is transmitted in a telecommunications circuit by means of an electrical signal called the carrier or the carrier wave. In order for a carrier to convey information, some form of modulation is required. The mode of modulation can be categorized broadly as analog or digital.

Switching System :-

D r. M N Narsaiah  also shared about Switching Systems This network connection cannot be simply made with telephone sets and bunch of wires, but a good system is required to make or break a connection. This system is known as the Switching System or the Switching Office or the Exchange. With the introduction of the switching system, the subscribers instead of getting connected directly to one another, are connected to a switching office and then to the required subscriber.

The early systems required manual operations to establish telephone calls. An operator used to receive a call from the calling subscriber and then connect the call to the called subscriber. Later on, the system was automated.

D r. M N Narsaiah had explained about control functions

The functions are starting call and ending call

1. Subscriber: - the subscriber in telecommunication are the we human.
2. Calling subscriber: -the calling subscriber in telecommunication is who is calling.
3. Called subscriber: -the called subscriber in telecommunication is whom we called.

D r. M N Narsaiah shared few information about SIM AND IMSI

SIM(subscriber identify module):-

 He said SIM stands for “subscriber identity module,” but that doesn’t mean much to most of us. In basic English, a SIM card is a memory chip that holds information about you as a cell phone subscriber. It uses a seventeen-digit number to identify the country, carrier, and user of any given cell phone.

So, when your cell phone connects to a mobile network , the SIM card tells the network who is using it. That way they can track how many minutes you’re using talking to your Aunty Cleo and how much data you’re gobbling up playing Candy Crush.

SIM cards can also store small amounts of information, like contacts. This makes it very useful for transferring your cell phone service to a new device. 

 He stated  An international mobile subscriber identity (IMSI) is a unique number, usually fifteen digits, associated with Global System for Mobile Communications (GSM) and Universal Mobile Telecommunications System (UMTS) network mobile phone users. The

IMSI  is a unique number identifying a GSM subscriber.

This number has two parts. The initial part is comprised of six digits in the North American standard and five digits in the European standard. It identifies the GSM network operator in a specific country with whom the subscriber holds an account. The second part is allocated by

the network operator to uniquely identify the subscriber.

The IMSI is stored in the Subscriber Identity Module (SIM) inside the phone and is sent by the phone to the appropriate network. The IMSI is used to acquire the details of the mobile in the Home Location Register (HLR) or the Visitor Location Register (VLR).

D r. M N Narsaiah said few Limitations of conventional mobile communications:-

The different limitations of conventional mobile system are:

• The conventional mobile system is a wired form of communication.
• The cost increases due to the the use of wires and cables.
• This system requires a proper space for installation.

• Wires in this system can be broken at any time and hence causes disturbance in the service frequently.

  These limitations can be overcome with the use of wireless mobile system as it is more simpler and user friendly and also  cheaper as compared to conventional mobile system.

  Cell site:-

   He gave a brief information about Cell Site. A cell site is defined as the entire set of equipment needed to receive and transmit radio signals for cellular voice and data transmission; typically includes transmitters, receivers, power amplifiers, combiners, filters, a digital signal processor, a power supply and network interface modules.

  Multiple cellular providers often save money by mounting their antennas on a common shared mast; since separate systems use different frequencies, antennas can be located close together without interfering with each other. Some provider companies operate multiple cellular networks and similarly use colocated base stations for two or more cellular networks

  Some cities require that cell sites be inconspicuous; they can be blended with the surrounding area or mounted on buildings or advertising towers. Preserved treescapes can often hide cell towers inside an artificial or preserved tree. These installations are generally referred to as concealed cell sites or stealth cell sites.

  • Every cell site has its own spectrum

    Cell splitting is done in 3 ways that is:-

    1. Large cell which has low density
    2. Small cell which has high density

   

   

   

   

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Biography:

DR.M N Narsaiah was in 4^th April 1980 and he was 18 years of experience. He was completed B-tech in ECE from VJIT, Hyderabad. He was completed master's degree in VLSI system design from JBREC at Hyderabad. He was completed the Ph.D. from JNTUH in the areas of image processing, January 2022. Presently working as an associate professor and HOD in electronic and communication engineering in K G Reddy college of engineering and technology.