510 questions and answers
What are tunnelling and encapsulation in the context of mobile IP?
The encapsulation process creates a logical construct called a tunnel between the device that encapsulates and the one that decapsulates.
Draw the system architecture of GSM and explain the functionality of HLR and VLR. Why is the cell structure supposed to be a hexagon in a mobile network?
The GSM network can be divided into five main groups: 1) Mobile station(MS): It include mobile equipment(ME) and the subscriber identity module(SIM)
Explain the concept of frequency reuse in cellular systems.
Frequency reuse is the process of using the same radio frequencies on radio transmitter sites within a geographic area that are separated by sufficient distance to cause minimal interference with each other.
What do you mean by co-channel interference and system capacity?
Co channel interference is the interference between two access points(APs) or base stations operating at the same frequency.
Discuss the three different mechanisms to improve the cell capacity and coverage area in a cellular system.
When a cells capacity is no longer able to provide an acceptable QOS, several methods can be to increase system capacity.in areas where there is poor reception of radio signals, the use of repeaters can improve radio coverage
Describe the architecture of a 3G network. What are the various services associated with a 3G network?
The 3G system consists of two main parts: the User Equipment (UE) and the UMTS Terrestrial Radio Access Network (UTRAN). The UE is the mobile phone and the UTRAN is the base station and the network intelligence.
Define packet switching and circuit switching. What is MANET?
In packet switched network, the message is divided into packets of fixed or variable size. In packet switching, there is no allocation for a packet and there is no scheduled processing time for each packet. Resources are allocated on demand.
Briefly differentiate between CDMA and GSM technologies.
1)Code Division Multiple Access 2) storage type is internal memory
Briefly describe the congestion control, slow start and fast retransmit mechanism.
Congestion occurs when the load network i.e, the number of packets sent to the network is greater than the capacity of the network. Congestion control refers to the mechanisms and techniques to control the congestion and control the load below the capacity. The congestion control mechanism are divided into two categories:
What are the functions of home agent and foreign agent in mobile IP? How does I-TCP differ from traditional TCP? Describe with shome agent & foreign agent and I-TCP vs. traditional TCPuitable diagram.
Home agent is a type of mobility agent. In Mobile Internet Protocol (Mobile IP), a home agent is a router on a mobile node's home network that maintains information about the device's current location, as identified in its care-of address.
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