15-06-2012, 10:49 AM
THE ROLE OF INTERNET TECHNOLOGY IN FUTURE MOBILE DATA SYSTEMS
[attachment=24505]
Abstract
Mobile telephony and the Internet are the fastest growing
businesses in the telecommunications market. This is why most
operators and service providers are looking after the
development of new services in both sectors and newcomers are
expected to enter the arena. The mobile operators foresee an
increasing share of their revenues coming from new data
services, whilst Internet Service Providers (ISPs) are
attracted from wireless technology and mobility services both
to reduce costs within the last-mile segment and to enrich
their market share providing ubiquitous access to the Internet
and corporate intranets.
Introduction
Mobile telephony and the Internet are the fastest growing
businesses in the telecommunications market. This is why most
operators and service providers are looking after the
development of new services in both sectors and newcomers are
expected to enter the arena. The mobile operators foresee an
increasing share of their revenues coming from new data
services, whilst Internet Service Providers (ISPs) are
attracted from wireless technology and mobility services both
to reduce costs within the last-mile segment and to enrich
their market potential providing ubiquitous access to the
Internet and corporate intranets.
IP services within mobile networks
Approaching the market of data communications, during the last
few years the PLMN (Public Land Mobile Network) operators have
begun to deliver data services to their customers. Currently
available solutions for data transfer over the GSM network
include the Short Message Service (SMS), that allows a basic
e-mail exchange, and the traditional low speed Circuit
Switched Data (CSD), that may be used to access Internet
services. The main drawbacks of CSD are the very limited
bandwidth capacity (9.6 kbps or 14.4 kbps depending on the
employed coding scheme) and the sub-optimal use of the radio
interface. A straightforward extension of CSD is the High
Speed Circuit Switched Data (HSCSD) [1], which increases the
transmission capacity by allocating to a single user up to 8
CSD channels. Anyway this solution still makes use of the
radio resources in circuit switched mode and is therefore
poorly optimized for the bursty traffic profile generated by
most of Internet applications.
Mobility within the Internet
The increasing diffusion of portable devices, such as laptops,
PDAs and smart phones, have recently led to a growing demand
for access to the Internet and corporate intranets independent
of the technology and the point of attachment. Today's ISPs
cope with these new user needs by offering a set of dial-up
services including remote Internet access as well as secure
access to corporate intranets established by means of
tunneling protocols like PPP [5], L2TP [6] and IPSec [7].
Besides, most of current ISPs have joined together in
confederations (e.g. iPass [8] and GRIC [9]) to provide
network access on a wider area and in a cost effective way.
New technologies for user roaming among ISPs have been
deployed so that the professional on the move can access the
services he has subscribed with his home ISP without having to
afford a long distance call to his hometown, but just by
setting up a dial-up connection to the nearest Network Access
Server (NAS) managed by any of the confederation members.
Advanced IP mobility protocols
Mobile IP (MIP) [15] is the IETF proposed standard solution
for handling terminal mobility among IP subnets and was
designed to allow a host to transparently change its point of
attachment to the Internet. MIP works at the network layer
influencing the routing of datagrams and for this reason it
can easily handle mobility among different media (LANs, dialup
links, wireless channels, etc.). As a main feature, MIP is
completely transparent to applications in that no IP address
changes are needed to allow mobility, but the mobile node (MN)
can communicate using its home address regardless of its
actual position in the Internet.
[attachment=24505]
Abstract
Mobile telephony and the Internet are the fastest growing
businesses in the telecommunications market. This is why most
operators and service providers are looking after the
development of new services in both sectors and newcomers are
expected to enter the arena. The mobile operators foresee an
increasing share of their revenues coming from new data
services, whilst Internet Service Providers (ISPs) are
attracted from wireless technology and mobility services both
to reduce costs within the last-mile segment and to enrich
their market share providing ubiquitous access to the Internet
and corporate intranets.
Introduction
Mobile telephony and the Internet are the fastest growing
businesses in the telecommunications market. This is why most
operators and service providers are looking after the
development of new services in both sectors and newcomers are
expected to enter the arena. The mobile operators foresee an
increasing share of their revenues coming from new data
services, whilst Internet Service Providers (ISPs) are
attracted from wireless technology and mobility services both
to reduce costs within the last-mile segment and to enrich
their market potential providing ubiquitous access to the
Internet and corporate intranets.
IP services within mobile networks
Approaching the market of data communications, during the last
few years the PLMN (Public Land Mobile Network) operators have
begun to deliver data services to their customers. Currently
available solutions for data transfer over the GSM network
include the Short Message Service (SMS), that allows a basic
e-mail exchange, and the traditional low speed Circuit
Switched Data (CSD), that may be used to access Internet
services. The main drawbacks of CSD are the very limited
bandwidth capacity (9.6 kbps or 14.4 kbps depending on the
employed coding scheme) and the sub-optimal use of the radio
interface. A straightforward extension of CSD is the High
Speed Circuit Switched Data (HSCSD) [1], which increases the
transmission capacity by allocating to a single user up to 8
CSD channels. Anyway this solution still makes use of the
radio resources in circuit switched mode and is therefore
poorly optimized for the bursty traffic profile generated by
most of Internet applications.
Mobility within the Internet
The increasing diffusion of portable devices, such as laptops,
PDAs and smart phones, have recently led to a growing demand
for access to the Internet and corporate intranets independent
of the technology and the point of attachment. Today's ISPs
cope with these new user needs by offering a set of dial-up
services including remote Internet access as well as secure
access to corporate intranets established by means of
tunneling protocols like PPP [5], L2TP [6] and IPSec [7].
Besides, most of current ISPs have joined together in
confederations (e.g. iPass [8] and GRIC [9]) to provide
network access on a wider area and in a cost effective way.
New technologies for user roaming among ISPs have been
deployed so that the professional on the move can access the
services he has subscribed with his home ISP without having to
afford a long distance call to his hometown, but just by
setting up a dial-up connection to the nearest Network Access
Server (NAS) managed by any of the confederation members.
Advanced IP mobility protocols
Mobile IP (MIP) [15] is the IETF proposed standard solution
for handling terminal mobility among IP subnets and was
designed to allow a host to transparently change its point of
attachment to the Internet. MIP works at the network layer
influencing the routing of datagrams and for this reason it
can easily handle mobility among different media (LANs, dialup
links, wireless channels, etc.). As a main feature, MIP is
completely transparent to applications in that no IP address
changes are needed to allow mobility, but the mobile node (MN)
can communicate using its home address regardless of its
actual position in the Internet.