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STUTTGART

TECHNIK

Background 

        STUTTGART UNIVERSITY OF APPLIED 

SCIENCES 

Database (for example, Oracle spatial data). At last the data requested was sent back 

to  the  Mobile  Client  as  map  in  form  of  image.  This  application  can  be  seen  as  one 

user part of the LBS system, see Figure 1. 

GPS/LBS 

Database 

Position data 

Request 

Get

User Request 

User Request 

Data 

Wireless 

Mobile Client 

communication 

WMS 

Data 

Data 

Fig. 1: 

This application can be seen as one user part of the LBS system

In  this  system,  because  of  the  limited  ability  of  the  mobile  client,  the  most  of 

collection and calculation of the data should be performed  in  WMS, and the Mobile 

client only sends request and receives the result data.   

2.1.2  Mobile devices 

Mobile device is a wide term covering information terminals, information appliances, 

Personal  Digital  Assistant  (PDA),  mobile  phones  etc.  According  to  Gartner  (2003), 

mobile  devices  can  be  broadly  classified  into  two  categories

:  Cellular  phones  with 

increasing computing capabilities,  including the display of graphics and the enabling 

of  interaction  via  graphics  (Smartphones,  Communicator)  and  Portable  computers, 

which can be upgraded to voice communication capabilities (e.g. PDA) 

Each  mobile  device  has  its  own  Operation  System  (OS),  which  is  to  give  user 

interface  and  control  the  devices  synchronous.  Now  there  are  four  main  OS  in  the 

market:  Symbian,  Smartphone,  Palm  OS,  Linux.  Symbian  was  built  by  Nokia, 

Motorala and Erison. In 2005, the mobilephones that have been installed Symbian OS 

occupy  51%  of  the  smartphnes  in  the  world  (Internetnews.com

1

,  2006). Though,  for 

1

  http://www.internetnews.com/wireless/article.php/3584431 

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