19-02-2011, 09:30 AM
presented by:
k.janakiraman M.sc,M.Phil
[attachment=8812]
CHALLENGES IN MIGRATION TO 4G
Abstract
Convergence of mobile communications, computing and Internet is on the way. This provides the driving force towards development of 4G technology. 4G mobile systems have the potential to provide flash high data rates over a wide area and roaming facility. 3G merely focus on developing new standard and hardware whereas 4G systems will support Imprehensive and personalized services, providing stable system performance and quality of service (Qos). However, such technologies don't come without their challenge .In this paper these challenges are discussed as well as the proposed solutions to the targeting different service types, data rates, and users. In Figure l the shift in shown: while 2G was focused on full coverage for cellular systems offering only one techno I provides its services only in dedicated areas and introduces the concept of vertical handover.
Introduction
Mobility is one of the most compelling features in communication these days, having an enormous impact on computing. A lot of research on mobility in next generation network systems is being done, which promises or emerging omnipresent and
ubiquitous communications. The standards for Fourth Generation (4G) networks systems are evolving. These networks systems require new level of mobility support as compared to traditional .2G systems such as GSM, IS-95, and cdma One were designed to carry speech and low-bit-rate success prompted the development of third-generation (3G) mobile systems. They were designed higher data-rate services. During the evolution from 2G to 3G, a range of wireless systems, including TMT-2000, Bluetooth, WLAN, and Hiper LAN, have been developed. All these systems we independently, Coupling with wireless local area network (WLAN) systems, 4G will be a convergence plat form all the network layers. Researchers are trying to establish 4G systems that integrate existing and newly developed wireless and also developing frameworks for 4G networks. Different research programs, such as M MIRAI, QOS and Do Como, have their own Visions on 4G features and implementations. The next generation (4G) is the futuristic approach and is envisioned as a convergence of different wireless access technologies providing the user with the best Anywhere, anytime connection and better resource utilization.
Personalization
This new-generation network will provide personalized service. In order to meet the demands of diverse users, service providers should design personal and customized services.
Integrated services
4G systems also provide facilities for integrated services. Users can use multiple services from any service provider at the same time.
Terminal Heterogeneity and Network Heterogeneity
In order to be a step ahead of 3G, 4G just not only provide higher data rates but also a clear and tangible advantage in people's everyday life. Thus the success of 4G will consist of a combination of terminal heterogeneity and network heterogeneity. Terminal heterogeneity refers to the different types of terminals in terms of display size, energy consumption,
portability weight, complexity etc. Network heterogeneity is related to the increasing heterogeneity of wireless networks due to the proliferation in the number of access technologies available (e.g., WiMAX, Wi-Fi, and Bluetooth). These heterogeneous wireless access networks typically differ in terms of coverage, data rate, latency, and loss rate. Therefore, each of them is practically designed to support a different set of specific services and devices. 4G will encompass
various types of terminals, which may have to provide common services independently of their capabilities
Challenges in Integrating Heterogeneous Systems
It is convenient to discuss the challenges (and their proposed solutions) by grouping them into three different aspects namely Mobile station, System and Service. In this section each of the key research areas are explained
Mobile Station
Multimode User Terminals In order to use the large variety of services and wireless networks in 4G systems, multimode user
terminals are essentials as they can adapt to different wireless networks by reconfiguring themselves. This eliminates the need to use multiple terminals. The most promising way of implementing multimode user terminals is to adopt the software radio approach. Figure2 shows the design of an ideal software radio. The analog part of the receiver consists of an antenna, a band pass filter (BPF), and a low noise amplifier (LNA). The received analog signal is digitized by the Analog/digital converter (ADC) immediately after the analog processing .The processing in the next stage (usually still analog processing in conventional terminals) is then performed by a reprogrammable base band digital signal processor (DSP).
k.janakiraman M.sc,M.Phil
[attachment=8812]
CHALLENGES IN MIGRATION TO 4G
Abstract
Convergence of mobile communications, computing and Internet is on the way. This provides the driving force towards development of 4G technology. 4G mobile systems have the potential to provide flash high data rates over a wide area and roaming facility. 3G merely focus on developing new standard and hardware whereas 4G systems will support Imprehensive and personalized services, providing stable system performance and quality of service (Qos). However, such technologies don't come without their challenge .In this paper these challenges are discussed as well as the proposed solutions to the targeting different service types, data rates, and users. In Figure l the shift in shown: while 2G was focused on full coverage for cellular systems offering only one techno I provides its services only in dedicated areas and introduces the concept of vertical handover.
Introduction
Mobility is one of the most compelling features in communication these days, having an enormous impact on computing. A lot of research on mobility in next generation network systems is being done, which promises or emerging omnipresent and
ubiquitous communications. The standards for Fourth Generation (4G) networks systems are evolving. These networks systems require new level of mobility support as compared to traditional .2G systems such as GSM, IS-95, and cdma One were designed to carry speech and low-bit-rate success prompted the development of third-generation (3G) mobile systems. They were designed higher data-rate services. During the evolution from 2G to 3G, a range of wireless systems, including TMT-2000, Bluetooth, WLAN, and Hiper LAN, have been developed. All these systems we independently, Coupling with wireless local area network (WLAN) systems, 4G will be a convergence plat form all the network layers. Researchers are trying to establish 4G systems that integrate existing and newly developed wireless and also developing frameworks for 4G networks. Different research programs, such as M MIRAI, QOS and Do Como, have their own Visions on 4G features and implementations. The next generation (4G) is the futuristic approach and is envisioned as a convergence of different wireless access technologies providing the user with the best Anywhere, anytime connection and better resource utilization.
Personalization
This new-generation network will provide personalized service. In order to meet the demands of diverse users, service providers should design personal and customized services.
Integrated services
4G systems also provide facilities for integrated services. Users can use multiple services from any service provider at the same time.
Terminal Heterogeneity and Network Heterogeneity
In order to be a step ahead of 3G, 4G just not only provide higher data rates but also a clear and tangible advantage in people's everyday life. Thus the success of 4G will consist of a combination of terminal heterogeneity and network heterogeneity. Terminal heterogeneity refers to the different types of terminals in terms of display size, energy consumption,
portability weight, complexity etc. Network heterogeneity is related to the increasing heterogeneity of wireless networks due to the proliferation in the number of access technologies available (e.g., WiMAX, Wi-Fi, and Bluetooth). These heterogeneous wireless access networks typically differ in terms of coverage, data rate, latency, and loss rate. Therefore, each of them is practically designed to support a different set of specific services and devices. 4G will encompass
various types of terminals, which may have to provide common services independently of their capabilities
Challenges in Integrating Heterogeneous Systems
It is convenient to discuss the challenges (and their proposed solutions) by grouping them into three different aspects namely Mobile station, System and Service. In this section each of the key research areas are explained
Mobile Station
Multimode User Terminals In order to use the large variety of services and wireless networks in 4G systems, multimode user
terminals are essentials as they can adapt to different wireless networks by reconfiguring themselves. This eliminates the need to use multiple terminals. The most promising way of implementing multimode user terminals is to adopt the software radio approach. Figure2 shows the design of an ideal software radio. The analog part of the receiver consists of an antenna, a band pass filter (BPF), and a low noise amplifier (LNA). The received analog signal is digitized by the Analog/digital converter (ADC) immediately after the analog processing .The processing in the next stage (usually still analog processing in conventional terminals) is then performed by a reprogrammable base band digital signal processor (DSP).
