Location Based Web Search on GSM/GPRS Mobile Devices VVS. Nare sh, - - PowerPoint PPT Presentation

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Location Based Web Search on GSM/GPRS Mobile Devices VVS. Nare sh, - - PowerPoint PPT Presentation

Dec 28, 2023 184 likes •397 views

Location Based Web Search on GSM/GPRS Mobile Devices VVS. Nare sh, Prasad Ping ali, Vasude va Varma I nte rnatio nal I nstitute o f I nfo rmatio n T e c hno lo g y, Hyde rabad, I ndia Murali K rishna Punag anti Ve nkata No kia Re se arc

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SLIDE 1

Location Based Web Search

  • n GSM/GPRS Mobile Devices
  • VVS. Nare sh, Prasad Ping ali, Vasude va Varma

I nte rnatio nal I nstitute o f I nfo rmatio n T e c hno lo g y, Hyde rabad, I ndia

Murali K rishna Punag anti Ve nkata

No kia Re se arc h Ce nte r, He lsinki, F inland

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SLIDE 2

Agenda

  • I

ntro duc tio n

  • So lutio n Outline
  • Ste ps I

nvo lve d

  • Ope n I

ssue s

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SLIDE 3

Current search

  • Obtaine d fro m http:/

/ mo bile se arc h.no kia.c o m

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SLIDE 4

I ntroduction

  • Go al o f this pro je c t : Pro vide a L
  • c atio n Base d

Se arc h (L

BS ) fo r GS M/ GPRS base d mo bile de vic e s.

  • GS

M is a do minant mo bile pho ne syste m.

  • Mo bile de vic e s mo st suite d fo r lo c atio n base d

se rvic e s, be c ause the y are “mo bile ”

  • L
  • c atio n base d se rvic e s we re trie d o n de skto ps using

I P addre sse s fo r ano nymo us use rs.

– e .g . URL re dire c tio n base d o n use r's I P addre ss

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SLIDE 5

Solution Outline

  • T

he so lutio n c an be se e n as two main ste ps

– Obtain Mo bile De vic e L

  • c atio n

– We b se arc h using L

  • c atio n.
  • Diffic ultie s I

nvo lve d

– Obtaining the lo c atio n string database – Re fining and re -ranking re sults

  • Ope n I

ssue s

– S tandardizatio n o f lo c atio n parame te rs – Privac y I ssue s – S e c urity Po lic ie s

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SLIDE 6

Steps I nvolved

  • Displaye d lo c atio n string no t ac c e ssible fo r

third-party applic atio ns

  • Mo bile De vic e L
  • c atio n ne e ds to be infe rre d

– Ge t L

  • c atio n Co de s fro m De vic e

– L

  • o kup L
  • c atio n Co de s to g e t L
  • c atio n Name s
  • We b S

e arc h Using L

  • c atio n

– Que ry E xpansio n – We b Me ta-S e arc h – Me rg e and Rank S e arc h Re sults using a We ig hte d Ranking func tio n. – De fault Ranking is base d o n Granularity o f L

  • c atio n.
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SLIDE 7

Obtain Mobile Device Location

  • Inte r

national Mobile Subsc r ibe r Ide ntity (IMSI) use d fo r ide ntifying a mo bile pho ne subsc ribe r Maximum le ng th o f c o de be ing 15 symbo ls Co mpo se d o f thre e diffe re nt parts

  • MCC (Mobile Countr

y Code )

  • 3 digits fixe d le ngth
  • MNC (Mobile Ne twor

k Code )

  • 1-2 digits, var

iable le ngth

  • MSIN or

MIN (Mobile Station Ide ntific ation Numbe r )

  • maximum 10 digits , var

iable le ngth

L

  • c atio n Parame te rs o f I

nte re st

T

  • tally 4 parame te rs

T wo fro m I MS I whic h are standardize d by IT

U-T(T

he I nte rnatio nal T e le c o mmunic atio n Unio n – T e le c o mmunic atio n S tandardizatio n S e c to r):

  • Mo bile Ne two rk Co de (MNC)
  • Mo bile Co untry Co de (MCC)

T wo fro m S e rvic e Pro vide r S pe c ific I nfo rmatio n

  • L
  • c ation Ar

e a Code (L AC) and

  • Ce ll ID
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SLIDE 8

Get Location I nform ation

  • T

he S ymbian C++ (se rie s 60 ve rsio n-2.1) c o de snippe t to g e t all fo ur lo c atio n parame te rs fro m a mo bile de vic e lo o ks like this:

RTelServer server; CleanupClosePushL(server); User::LeaveIfError(server.Connect()); User::LeaveIfError(server.LoadPhoneModule(_L("phonetsy.tsy"))); RTelServer::TPhoneInfo info; User::LeaveIfError(server.GetPhoneInfo(0, info)); RBasicGsmPhone phone; CleanupClosePushL(phone); User::LeaveIfError(phone.Open(server, info.iName)); MBasicGsmPhoneNetwork::TCurrentNetworkInfo ni ; phone.GetCurrentNetworkInfo( ni ) ; TInt MCC = ni.iNetworkInfo.iId.iMCC; //Mobile Country Code TInt MNC = ni.iNetworkInfo.iId.iMNC; //Mobile Network Code TInt locationareacode = ni.iLocationAreaCode; //Location Area Code TInt cellId = ni.iCellId; //Cell ID

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SLIDE 9

Query Expansion & Search

  • Que ry E

xpansio n fo r e ac h L

  • c atio n Name

I ndividually.

  • T

hre e type s o f e xpansio n using

– Co untry name (MCC) – City Name / Re g io n Name (L AC) – Re g io n Name within City (Ce llI D)

  • Re g io n be ing mo st g ranular, Co untry be ing

le ast g ranular info rmatio n

  • S

e arc h Re sults me rg e d, ranke d using g ranularity o f lo c atio n.

  • Ranking func tio n we ig hts are tunable .
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SLIDE 10

Exam ple Location Based Search for “Chinese Restaurant”

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SLIDE 11

Exam ple Location Based Search for “Chinese Restaurant”

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SLIDE 12

Exam ple Location Based Search for “Chinese Restaurant”

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SLIDE 13

Exam ple Location Based Search for “Chinese Restaurant”

The above results are from a location in India-Hyderabad- Banjara Hills

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SLIDE 14

MNC – 013 –Service Provider “C” Service Provider A Service Provider C Service Provider B

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SLIDE 15

MCC – 404 - India

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SLIDE 16

LAC – 2711 Hyderabad

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SLIDE 17

Banjara Hills

CellID – 04BE

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SLIDE 18

Obtaining the Location Database

  • Diffic ulty in Obtaining L
  • c atio n Database

be c ause

– T hre e o f the fo ur L

  • c atio n parame te rs vary ac ro ss

se rvic e pro vide rs e xc e pt MCC (Mo bile Co untry Co de ).

  • Use d c o mmunity e ffo rt to po pulate the

database .

  • Applic atio n pro mpts use r to ide ntify any

unkno wn lo c atio n c o de s. Use rs he lp po pulating the database .

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SLIDE 19

I ssues

  • No t all lo c atio n parame te rs are standardize d.

T he re fo re make s the task muc h mo re c o mplic ate d than I P addre ss to L

  • c atio n

mapping in de skto ps.

  • Ope n issue s

– Use r Privac y – S e c urity

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SLIDE 20

Questions??