3G and other network

Explain:

a.) GPRS ( General Packet Radio Service):
b.) GSM (Global System for Mobile Communications):
c.) HLR (Home Location Register): d.) iDEN(Integrated Digital Enhanced Network): e.) i-appli

GPRS ( General Packet Radio Service)

a. Packet oriented mobile data service available to the users of 2G cellular systems.
b. It is global system for communicating through mobile phones using GSM as well as in 3G systems.
c. GPRS data transfer is charged per MB of traffic transferred, where as in circuit switching, data transfer is charged per minute of connection time
d. GPRS is better packet switching service, as opposed to circuit switching.
e. 2G cellular systems are combined with GPRS and known as 2.5G.
f. Provides moderate speed data transfer by using unused TDMA channels, such as GSM.

GSM (Global System for Mobile Communications)

a. Most popular standard for mobile telephony systems, originated from Groupe Special Mobile
b. The ubiquity of GSM enables the international roaming arrangements among mobile phone operators.
c. Both signaling and speech channels are digital, and thus GSM is considered as 2G mobile phone system.
d. GSM standard benefited customers the ability to roam and switch carriers without replacing the hand sets and network operators.
e. GSM implements low-cost implementation of Short Message Service

HLR (Home Location Register)

a. For GSM and CDMA wireless networks
b. It’s responsibility is to authenticate and authorize subscribers and their services

iDEN (Integrated Digital Enhanced Network)

a. A wireless technology for Motorola
b. It has the capabilities of digi-cellular phone, 2 way radio, alphanumeric pager and data modem / fax modem in a single network
c. Operational bands are 800 MHz, 900 MHz and 1.5 GHz
d. iDEN is based on TDMA (Time Division Multiple Access) and GSM architecture
e. For voice compression it uses Motorola’s Vector Sum Excited Linear Predictors vocoder
f. For delivering 64KBPS over a 25 KHz channel, it uses QAM modulation.
g. iDEN is designed to serve the mobile user for accessing information quickly without carrying several devices.

i-appli

a. i-appli is a Java environment based on CLDC.
b. Handsets of NTT DoCoMos are utilizing i-appli
c. It is similar to MIDP, however both APIs are incompatible.