assignment 3

7/17/2019 Assignment 3

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Assignment 3Wireless Networking

Raldy Dhe Vega

USSD, SMS, MMS, Bluetooth,Wireless, Infrared

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USSD

USSD (Unstructured Supplementary Service Data) is a GlobalSystem for Mobile (GSM) communication technology that is used to

send text between a mobile phone and an application program inthe network !pplications may include prepaid roaming or mobilechatting

USSD is similar to Short Messaging Service (SMS)" but" unlikeSMS" USSD transactions occur during the session only #ith SMS"message scan be sent to a mobile phone and stored for several daysif the phone is not activated or within range

USSD messages are up to $%& alphanumeric characters in length

Unlike Short Message Service (SMS) messages" USSD messagescreate a real'time connection during a USSD session he

connection remains open" allowing a two'way exchange of a

seuence of data his makes USSD more responsive than services

that use SMS

Uses#hen a user sends a message to the phone company

network" a computer dedicated to USSD receives it he computer*sresponse is sent back to the phone" generally in a basic format that

can easily be seen on the phone display !ny standardi+ation bodydoes not de,ne messages sent over USSD" so each networkoperator can implement whatever is most suitable for its customers

-repaid GSM cellular phones to uery the available balancecommonly use USSD he vendor*s .check balance. applicationhides the details of the USSD protocol from the user /n some payas you go networks" such as esco Mobile" once a user performs anaction that costs money" the user sees a USSD message with hisnew balance USSD can also be used to re,ll the balance on theuser*s S0M card and to deliver one'time passwords or -01 codes

USSD ModeMobile'initiated

USSD2 -U33 or USSD2 -&-#hen the user dials a code" eg 4$567 from a GSM mobile handset1etwork'initiated

USSD2 -US8 or USSD2 !&-#hen the user receives a push message from the network9 primarily

used for promotional services:xample USSD codes



4$;$74$564$4$&5<=>?%6;7

SMSShort message service is a mechanism of delivery of short

messages over the mobile networks 0t is a store and forward way of transmitting messages to and from mobiles he message (textonly) from the sending mobile is stored in a central short messagecenter (SMS) which then forwards it to the destination mobile hismeans that in the case that the recipient is not available" the shortmessage is stored and can be sent later

:ach short message can be no longer than $>; characters hese characters can be text (alphanumeric) or binary 1on'extShort messages !n interesting feature of SMS is return receipts his means that the sender" if wishes" can get a small messagenotifying if the short message was delivered to the intendedrecipient

Since SMS used signaling channel as opposed to dedicatedchannels" these messages can be sent2received simultaneously withthe voice2data2fax service over a GSM network SMS supportsnational and international roaming his means that you can sendshort messages to any other GSM mobile user around the world

#ith the -@S networks based on all the three technologies" GSM"@DM! and DM! supporting SMS" SMS is more or less a universalmobile data service

AAAA 1oteB he actual limit of si+e of SMS is $>; characters if 3atinalphabets are used 0f non'3atin alphabets like @hinese or !rabic areused" the limit is ?; characters

MMS

Multimedia Messaging Service

MMS is a descendant of SMS (Short Messaging Service) MMSextends text messaging to include longer text" graphics" photos"audio clips" video clips" or any combination of the above" withincertain si+e limits

MMS is freuently used to send photos and videos from cameraphones to other MMS phones or email accounts Most cameraphones have MMS" but many non'camera phones have it as well

Many newer MMS phones also support SM03" which allows various



parts of an MMS message to be arranged into a small multimedia.slideshow. to be viewed on another SM03'capable MMS phone

l!etooth

Cluetooth is a speci,cation (0::: %;&$=$) for the use of low'power radio communications to link phones" computers and othernetwork devices over short distances without wires he nameCluetooth is borrowed from 8erald Cluetooth" a king in Denmarkmore than $";;; years ago

Cluetooth technology was designed primarily to supportsimple wireless networking of personal consumer devices andperipherals" including cell phones" -D!s" and wireless headsets#ireless signals transmitted with Cluetooth cover short distances"typically up to 5; feet ($; meters) Cluetooth devices generallycommunicate at less than $ Mbps

Wireless#ireless is a term used to describe telecommunications in

which electromagnetic waves (rather than some form of wire) carrythe signal over part or the entire communication path Somemonitoring devices" such as intrusion alarms" employ acousticwaves at freuencies above the range of human hearing9 these arealso sometimes classi,ed as wireless

he ,rst wireless transmitters went on the air in the early &;thcentury using radiotelegraphy (Morse code) 3ater" as modulation

made it possible to transmit voices and music via wireless" themedium came to be called .radio. #ith the advent of television"fax" data communication" and the eective use of a larger portion of the spectrum" the term .wireless. has been resurrected

"n#rared

0nfrared technology allows computing devices to communicatevia short'range wireless signals #ith infrared" computers can

transfer ,les and other digital data bidirectional he infrared



transmission technology used in computers is similar to that used inconsumer product remote control units

0nstallation and Usage

@omputer infrared network adapters both transmit andreceive data through ports on the rear or side of a device 0nfraredadapters are installed in many laptops and handheld personaldevices 0n Microsoft #indows" infrared connections can be createdthrough the same method as other local area network connections0nfrared networks were designed to support direct two'computerconnections only" created temporarily as the need arises 8owever"extensions to infrared technology also support more than twocomputers and semi'permanent networks

assignment 3

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