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+ Wireless Communication Interview Questions and Answers, Question1: How frequency hopping is used for security in Bluetooth? Question2: Why is. ece Interview questions on wireless communication concept and Answer 1. concepts in Pdf Wireless Communication Concepts PDF. Short Questions & Answers on Mobile Communication. Subject Code-PEEC . SEM-6 th. SEC- ETC. Prepared by-Mr. M. R. Jena, Asst. Prof., Dept. of ETC. 1.

Wireless Communication Interview Questions And Answers Pdf

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Related Searches to Wirless Communication Interview Questions and Answers: wireless communication interview questions wireless communication interview. Wireless communication interview questions & answers with explanation on topics like Bluetooth, 3G, CDMA, LTE, GSM/GPRS, WiFi, WiFAX, FMC, Wireless. Essential Wireless Communication Interview Questions & Answers: The data transmitting on one frequency for a specific time limit and jumping randomly to another and transmitting again is the process in FHSS. Download Interview PDF.

Ques 2. What do you mean by frequency reuse? Answer 2. Each cellular Base Station is allocated a group of radio channels to be used. These radio channels can be used by another base station which is at a suitable distance away from it. Ques 3. What do you mean by Handoff? Answer 3. When a mobile moves into a different cell while a conversation is in progress, the Mobile Switching Center automatically transfers the call to a new channel belonging to the new Base Station.

Types of handoff: Ques 4. Diagrammatically represent the GSM architecture? Answer 4. GSM architecture is as follows: Ques 5. What do you mean by Mobile Station Subsystem? Answer 5. It includes mobile equipment which refers o a physical terminal such as telephone which includes the radio trans-receiver signal processor and the Subscriber Identity Module. Ques 6. What do you mean by Base Station Subsystem?

Answer 6. Ques 7. What do you mean by Network and Switching Subsystem? Answer 7. It controls hand offs between cells in different BSSs, authenticates users , validates and maintains their accounts.

It is mainly supported by four databases: Home Location Register. Visitor Location Register. Authentication Center. Equipment Identity Register. Ques 8. What do you mean by Ad-hoc networks?

Answer 8. Ad-hoc networks are those wireless Local Area Network that do not require any infrastructure to work. Set-up channels. Set-up channels also called control channels are the channels designated to setup calls. We should not be confused by fact that a call always needs a set-up channel.

A system can be operated without set-up channels. If we are choosing such a system all the channels in each cellular system block A or block B can be voice channels; however each mobile unit must then scan channels continuously and detect the signaling for its call. A customer who wants to initiate a call must scan all the channels and find an idle unoccupied one to use.

In a cellular system, we are implementing frequency-reuse concepts. In this case the set-up channels are acting as control channels. The 21 set-up channels are taken out from the total number of channels.


The number 21 is derived from a seven-cell frequency-reuse pattern with three sectors per cell, or a total of 21 sectors, which require 21 set-up channels. However, now only a few of the 21 setup channels are being used in each system. Theoretically, when cell size decreases the use of set-up channels should increase. Set-up channels can be classified by usage into two types: access channels and paging channels.

An access channel is used for the mobile-originating calls and paging channels for the land originating calls.

Essential Wireless Communication Interview Questions & Answers:

For this reason, a set-up channel is sometimes called an access channel and sometimes called a paging channel. Every two- way channel contains two kHz bandwidth.. Normally one set-up channel is also specified by two operations as a forward set-up channel using the upper band and a reverse set-up channel using the lower band. In the most common types of cellular systems, one set-up channel is used for both access and paging.

The forward setup channel functions as the paging channel for responding to the mobile-originating calls. The reverse set-up channel functions as the access channel for the responder to the paging call. The forward set-up channel is transmitted at the cell site, and the reverse set-up channel is transmitted at the mobile unit. All set-up channels carry data information only. Explain in detail access channels and operational techniques.

Because each set-up channel is associated with one cell, the strongest set-up channel indicates which cell is to serve the mobile-originating calls. When the idle bits are received, the mobile unit can use the corresponding reverse set-up channel to initiate a call. Frequently only one system operates in a given city; for instance, block B system might be operating and the mobile unit could be set to preferable A system.

When the mobile unit first scans the 21 set-up channels in block A, two conditions can occur.

If no set-up channels of block A are operational, the mobile unit automatically switches to block B. If a strong set-up signal strength is received but no message can be detected, then the scanner chooses the second strongest set-up channel.

If the message still cannot be detected, the mobile unit switches to block B and scans to block B set-up channels. The operational functions are described as follows: 1. Power of a forward set-up channel [or forward control channel FOCC ]: The power of the set-up channel can be varied in order to control the number of incoming calls served by the cell. The number of mobile-originating calls is limited by the number of voice channels in each cell site, when the traffic is heavy, most voice channels are occupied and the power of the set-up channel should be reduced in order to reduce the coverage of the cell for the incoming calls originating from the mobile unit.

This will force the mobile units to originate calls from other cell sites, assuming that all cells are adequately overlapped. The set-up channel received level: The setup channel threshold level is determined in order to control the reception at the reverse control channel RECC. If the received power level is greater than the given set-up threshold level, the call request will be taken. Change power at the mobile unit: When the mobile unit monitors the strongest signal strength from all Set-up channels and selects that channel to receive the messages, there are three types of message.

How frequency hopping is used for security in Bluetooth?

Blue tooth technology uses Adaptive Frequency Hopping and capable to reduce interference between wireless technologies with the help of 2. In order to take the advantage of the available frequency, Blue tooth's AFH works within the spectrum and is performed by the technology detecting other devices in the spectrum and avoiding the used frequencies.

Efficient transmission within the spectrum at high degree of interference immunity is achieved by adapting hopping among 79 frequencies at 1 MHz intervals.

Why is Bluetooth 2. Bluetooth 2.

An additional modulation scheme is used 3. It is backwards compatible 4. The number of connections running concurrently are more 5. It is capable of recovering from errors and 6. Power consumption is less. Flexibility and mobility are the growing reasons to use wireless LAN which uses radio frequencies for transmitting data.

Wireless LANs are established for communicating with one another while on the go. The data transmitting on one frequency for a specific time limit and jumping randomly to another and transmitting again is the process in FHSS.

The RF circuits can utilize class C amplification, efficient non-linear with a normal 1 MHz bandwidth. FHSS systems are better for use within indoors and in severe multipath environments.

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This is because of the frequency hopping scheme could defeat the multipath by hopping to a new frequency. Explain the term Airport in Bluetooth?Answer 1. To avoid confusion, people could take turns speaking time division , speak at different pitches frequency division , or speak in different directions spatial division.

These high frequency carrier signals can be transmitted over the air easily and are capable of travelling long distances. The reliability of PPTP is being tunneled for the purpose of providing privacy. Mobile station control message. Confidentiality or encryption does not provided by PPTP. Multicast: Communication between single sender and a list of select recipients in a network. Maintenance set up.

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