Computer Science, asked by samarthupadhyay942, 11 months ago

Which multiple access technique is used by ieee 802.11 stands for wireless lan?

Answers

Answered by BrainlyPopularman
10

Answer:

ABSTRACT: Network technologies are

traditionally based on wireline solutions. But

the introduction of the IEEE 802.11 standards

have made a huge impact on the market such

that laptops, PCs, printers, cellphones, and

VoIP phones, MP3 players in our homes, in

offices and even in public areas have

incorporated the wireless LAN technology.

Wireless broadband technologies nowadays

provide unlimited broadband access to users

which were previously offered only to wireline

users. In this paper, we review and summarize

one of the emerging wireless broadband

technology i.e. IEEE 802.11,which is a set of

physical layer standard for implementing

wireless local area network computer

communication in the 2.4,3.6,5 and 60GHz

frequency band. They fix technology issues or

add functionality which is expected to be

required by future applications. Though some

of the earlier versions of these technologies are

obsolete (such as HiperLAN) now but still we

have included them in this review for the sake

of completeness.

Keywords: Wireless Communications, IEEE

802.11, HiperLAN, WLAN, Wi-fi.

1. Introduction

The wireless broadband technologies were

developed with the aim of providing services

comparable to those provided to the wireline

networks. Cellular networks now provide support

for high bandwidth data transfer for numerous

mobile users simultaneously. In addition to this,

they also provide mobility support for voice

communication. Wireless data networks can be

divided into several types depending on their area

of coverage. They are:

WLAN: Wireless Local Area network, in area with

a cell radius up to hundred meters, mainly in home

and office environments.

WMAN: Wireless Metropolitan Area Network;

generally cover wider areas as large as entire cities.

WWAN: Wireless Wide Area Network with a cell

radius about 50 km, cover areas larger than a city.

However out of all of these standards, WLAN

and recent developments in WLAN technology

would be our main area of study in this paper. The

IEEE 802.11 is the most widely deployed WLAN

technology as of today. Another well known is the

HiperLAN standard by ETSI. Both these

technologies are united under the Wireless Fidelity

(Wi-fi) alliance. In literature though, IEEE802.11

and Wi-fi is used interchangeably and we will also

follow the same convention in this paper. A

typical WLAN network consists of an Access

Point (AP) in the middle/centre and a number of

stations (STAs) are connected to this central

Access Point (AP).Now, there are basically two

modes in which communication can take place.

In the centralized mode of communication,

communication to/from a STA is always carried

over the APs. There is also a decentralized mode in

which communication between two STAs can take

place directly without the requirement of an AP in

an ad hoc fashion. WLAN networks provide

coverage up to an area of 50-100 meters. Initially,

Wi-fi provided an aggregate throughput of

11Mbps, but recent developments have increased

the throughput to about 54 Mbps. As a result of its

high market penetration, several amendments to

the basic IEEE 802 standard have been developed

or are currently under development.

In this paper, we overview the IEEE 802.11

standard and address the technical context of its

extensions. In section 2, we briefly discuss the

history behind the development of the standard.

Section 3 deals with the features of the IEEE 802

family which have already been implemented. In

the following Section 4, we look at other standards

besides IEEE 802.11a; IEEE 802.11b/g. In section

5, some of the upcoming standards are discussed

and some open issues with the IEEE 802.11

standard is given in section 6. The HiperLAN and

Answered by Anonymous
2

Answer:

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Carrier-sense multiple access/collision avoidance

Which multiple access technique is used by IEEE 802.11 standard for wireless LAN? Explanation: CSMA/CA stands for Carrier-sense multiple access/collision avoidance. It is a multiple access protocol used by IEEE 802.11 standard for wireless LAN.

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