09-07-2011, 02:56 PM
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1) INTRODUCTION
Marconi’s innovative perception of electromagnetic waves and the air
interface in 1897 was the first milestone on the important road to shared use of the
radio spectrum. But only after almost a century later did mobile wireless
communication start to take off. Despite a series of disappointing false starts,
communication world in the late 1980’s was rapidly becoming more mobile for a
much wider segment of communication users than ever before. With the advent of
wireless technology, a transition from point-to-point communication toward person-
to-person communication (i.e.; independent of position) has begun. Testimony to this
is the rapidly increasing penetration of cellular phones all across the world. In
anticipation of the growing consumer demands, the next generation of wireless
systems endeavors to provide person-to-person communication of the circuit and
packet multi media data.
The first generation cellular networks, which were based on analog
technology with FM modulation, have been successfully deployed since the early and
mid 1980’s. A typical example of a first generation cellular telephone system (1G) is
the Advanced Mobile Phone Services (AMPS). Second generation (2G) wireless
systems employ digital modulation and advanced call-processing capabilities. In view
of the processing complexity required for these digital systems, two offered
advantages are the possibility of using spectrally efficient radio transmission schemes
such as Time Division Multiple Access (TDMA) or Code Division Multiple Access
(CDMA), in comparison to the analog Frequency Division Multiple Access (FDMA)
schemes previously employed and the provision for implementation of a wide variety
of integrated speech and data services such as paging and low data rate network
access. Examples of 2G wireless systems include the Global System for Mobile
communication (GSM), TDMA IS-54/IS-136 and Personal Digital Cellular (PDC).
Third Generation (3G) wireless systems will evolve from mature 2G
networks with the aim of providing universal access and global roaming. More
important these systems are expected to support multi dimensional (multi-information
media, multi-transmission media, and multi-layered networks) high-speed wireless
communication- an important milestone toward achieving the grand vision of
ubiquitous personal communications. Introduction of wide band packet-data services
for wireless Internet up to 2Mbps will be the main attribute of 3G system.
2) WHAT IS 3G ?
The third generation of mobile cellular systems are intended to unify
the diverse systems we see today into a seamless radio infrastructure capable of
offering a wide range of services in different radio environments, with the quality we
have come to expect from wire line communication networks.
Since the mid-80’s, studies on 3G systems have been carried out
within the International Telecommunication Union (ITU), where it was called Future
Public Land Mobile Telecommunication Systems (FPLMTS), lately renamed
International Mobile Telecommunicatons-2000 (IMT-2000). In Europe research and
development on 3G technology, is commonly referred to as the Universal Mobile
Telecommunication System (UMTS) and Mobile Broadband System (MBS), have
been conducted under the European Community Research into Advanced
Communications in Europe (RACE) and Advanced Communication Technologies
and Services (ACTS) programs. With support from activities in Europe, the United
States, Japan and developing countries, World Administrative Radio Conference
(WARC) of ITU identified global bands 1885-2025Mhz and 2110-2200Mhz for
IMT-2000 including 1980-2010Mhz and 2170-2200Mhz for the mobile satellite
component.
Key elements in the definition of 3G systems are the radio access
system and Radio Transmission Technology (RTT). As a part of the standardization
activities, a formal request by the ITU-Radio communication standardization sector
(ITU-R) for submission of candidate RTTs for IMT-2000 has been distributed by the
ITU. In response to this 10 proposals were submitted. Most of the proposals use
CDMA or WCDMA as their multiple access technique. So in this seminar we are
presenting the common features of WCDMA based 3G standards.
2.1) COMMON OBJECTIVES
Some major objectives envisioned for IMT-2000 and their key differences
from the current 2G mobile systems can be briefly summarized as follows:
Use of a common frequency band.
Use of a small pocket terminal with worldwide roaming.
Maximizing the commonality and optimization of radio interfaces for multiple
operating environments, such as vehicular, pedestrian, office and Fixed
Wireless Access (FWA) system.
Significantly high transmission speed capability encompassing circuit and
packet switched data with multimedia support.
Support for both symmetric and asymmetric data transfer in all operating
environments.
Compatibility with wireless services, which currently exist.
Spectrum efficiency, quality and overall cost improvement as a result
of utilization of advanced technologies such as DSP.
1) INTRODUCTION
Marconi’s innovative perception of electromagnetic waves and the air
interface in 1897 was the first milestone on the important road to shared use of the
radio spectrum. But only after almost a century later did mobile wireless
communication start to take off. Despite a series of disappointing false starts,
communication world in the late 1980’s was rapidly becoming more mobile for a
much wider segment of communication users than ever before. With the advent of
wireless technology, a transition from point-to-point communication toward person-
to-person communication (i.e.; independent of position) has begun. Testimony to this
is the rapidly increasing penetration of cellular phones all across the world. In
anticipation of the growing consumer demands, the next generation of wireless
systems endeavors to provide person-to-person communication of the circuit and
packet multi media data.
The first generation cellular networks, which were based on analog
technology with FM modulation, have been successfully deployed since the early and
mid 1980’s. A typical example of a first generation cellular telephone system (1G) is
the Advanced Mobile Phone Services (AMPS). Second generation (2G) wireless
systems employ digital modulation and advanced call-processing capabilities. In view
of the processing complexity required for these digital systems, two offered
advantages are the possibility of using spectrally efficient radio transmission schemes
such as Time Division Multiple Access (TDMA) or Code Division Multiple Access
(CDMA), in comparison to the analog Frequency Division Multiple Access (FDMA)
schemes previously employed and the provision for implementation of a wide variety
of integrated speech and data services such as paging and low data rate network
access. Examples of 2G wireless systems include the Global System for Mobile
communication (GSM), TDMA IS-54/IS-136 and Personal Digital Cellular (PDC).
Third Generation (3G) wireless systems will evolve from mature 2G
networks with the aim of providing universal access and global roaming. More
important these systems are expected to support multi dimensional (multi-information
media, multi-transmission media, and multi-layered networks) high-speed wireless
communication- an important milestone toward achieving the grand vision of
ubiquitous personal communications. Introduction of wide band packet-data services
for wireless Internet up to 2Mbps will be the main attribute of 3G system.
2) WHAT IS 3G ?
The third generation of mobile cellular systems are intended to unify
the diverse systems we see today into a seamless radio infrastructure capable of
offering a wide range of services in different radio environments, with the quality we
have come to expect from wire line communication networks.
Since the mid-80’s, studies on 3G systems have been carried out
within the International Telecommunication Union (ITU), where it was called Future
Public Land Mobile Telecommunication Systems (FPLMTS), lately renamed
International Mobile Telecommunicatons-2000 (IMT-2000). In Europe research and
development on 3G technology, is commonly referred to as the Universal Mobile
Telecommunication System (UMTS) and Mobile Broadband System (MBS), have
been conducted under the European Community Research into Advanced
Communications in Europe (RACE) and Advanced Communication Technologies
and Services (ACTS) programs. With support from activities in Europe, the United
States, Japan and developing countries, World Administrative Radio Conference
(WARC) of ITU identified global bands 1885-2025Mhz and 2110-2200Mhz for
IMT-2000 including 1980-2010Mhz and 2170-2200Mhz for the mobile satellite
component.
Key elements in the definition of 3G systems are the radio access
system and Radio Transmission Technology (RTT). As a part of the standardization
activities, a formal request by the ITU-Radio communication standardization sector
(ITU-R) for submission of candidate RTTs for IMT-2000 has been distributed by the
ITU. In response to this 10 proposals were submitted. Most of the proposals use
CDMA or WCDMA as their multiple access technique. So in this seminar we are
presenting the common features of WCDMA based 3G standards.
2.1) COMMON OBJECTIVES
Some major objectives envisioned for IMT-2000 and their key differences
from the current 2G mobile systems can be briefly summarized as follows:
Use of a common frequency band.
Use of a small pocket terminal with worldwide roaming.
Maximizing the commonality and optimization of radio interfaces for multiple
operating environments, such as vehicular, pedestrian, office and Fixed
Wireless Access (FWA) system.
Significantly high transmission speed capability encompassing circuit and
packet switched data with multimedia support.
Support for both symmetric and asymmetric data transfer in all operating
environments.
Compatibility with wireless services, which currently exist.
Spectrum efficiency, quality and overall cost improvement as a result
of utilization of advanced technologies such as DSP.
