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Abstract
The HP iPAQ hw6900 and hw6500 Mobile Messenger series are global communications devices
offering connectivity, productivity, and mobility with high-end GSM/GPRS/EDGE technologies.
GSM/GPRS/EDGE capabilities guarantee connectivity in and out of the office.
The HP iPAQ hw6900 and hw6500 Mobile Messenger series offer integrated GSM/GPRS
technology. The HP iPAQ hw6900 and hw6500 series also integrate EDGE capability. (Users will
need to subscribe to a wireless service to use these integrated features.)
Introduction to GSM/GPRS/EDGE
GSM technology is typically used for voice calls and text messaging, while GPRS/EDGE technology
provides a connection to the Internet that can be used for web browsing, multimedia messaging
service (MMS) messaging, or accessing a corporate network. With GSM/GPRS/EDGE, users can
retain connectivity outside of a local area network (LAN).
GSM
Global System for Mobile Communications (GSM) is a digital cellular phone technology based on
time division multiple access (TDMA) technology. GSM is a circuit-switched system that divides each
200 kHz channel into 8 time slots. Whereas TDMA defines only the air interface, dividing radio
frequencies into time slots and then allocating slots to multiple calls, GSM defines the entire cellular
system. GSM operates in the 900MHz and 1800MHz bands in Europe, and 1900MHz and
850MHz PCS bands in the U.S.
GSM has become the wireless communications standard for more than half of the world’s mobile
phones. Today, it is the most popular standard for mobile phones with more than 250 million mobile
phones operating with GSM technology.
The ubiquity of the GSM standard makes international roaming possible. As long as the subscriber’s
mobile phone supports the GSM band used in the specified country. Subscribers are able to use the
same mobile phone in many parts of the world. Frequency bands differ around the world. In the U.S.,
two (dual) of the available four (quad) bands are used. The HP iPAQ hw6900 and hw6500 Mobile
Messenger series support four bands to increase the available phone service coverage. To get
additional information about roaming and how it works, visit this web site:
http://www.gsmworld.com/roaming/how_roaming_works.shtml.
In addition to high quality mobile voice and data services with worldwide roaming capabilities, GSM
provides support to SMS and MMS messaging. SMS is capable of sending and receiving text
messaging up to 160 characters in length. MMS is capable of sending graphics, video clips, and
sound files.
SIM Cards
GSM phones use a Subscriber Identity Module (SIM) smart card containing user account information.
Each SIM card contains a computer chip with information about the user’s phone number, service,
registration information and contacts. By installing the SIM card into any GSM phone, it is
immediately programmed with the appropriate account information. SIM cards make it easier to rent
or borrow GSM phones because user information can be swapped in and out quickly.
SIM cards can also be programmed to display custom menus for personalized services. SIM cards
also contain the memory to store speed dial numbers and text messages.
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