Next Generation Mobile Systems 3G and Beyond phần 7 pdf

... designed for narrowband signals. The ITU-T standardized a wideband codec known as G .72 2 (ITU-T 1986) in 1986. It uses subband coding, where the input signal is split into two bands and separately ... increase in available bandwidth, 3G and XG mobile systems offer new possibilities and services. One of these new services will be the ability to stream sound and movies to mobile...

Ngày tải lên: 14/08/2014, 09:21

... 3G, the large scale, pervasive, and heterogeneous nature of XG (as we envision it) will drive the demand for significantly more flexible and advanced cryptographic techniques. Next Generation Mobile ... techniques that are currently used in 2G and 3G systems. This includes secret-key cryptography, as used in GSM and 3GPP systems, public-key cryptography, as used in SSL, and...

Ngày tải lên: 14/08/2014, 09:21

... for the Next Generation 1 1 Evolution of Mobile Networks and Services 3 1.1 TheEvolutionofMobileNetworks 4 1.2 TrendsinMobileServices 6 1.3 WhyNext -generation( XG)MobileSystems? 9 1.4 Next- generationImperatives ... others. 3G mobile networks are characterized by their ability to carry data at much higher rates than the 9.6 kbps (kilobits per second) Next Generation Mobile...

Ngày tải lên: 14/08/2014, 09:21

... of Mobile Network Technologies While the first-, second-, and third -generation cellular networks are based on circuit switch- ing and provide voice-centric services, the next- generation (XG) mobile ... review of the main 3G architectures, those developed or proposed by the industry for the 3rd Generation Partnership Project (3GPP), 3rd Generation Partnership Project-2 (3GPP...

Ngày tải lên: 14/08/2014, 09:21

... scheme for the systems of IMT-2000 and beyond. 3.2.3 Principles of DS-CDMA and IS-95 This section reviews the principle of DS-CDMA, on which the 3G systems and beyond are based, and discusses ... interworking among WLAN and external networks, and radio resource management. Higher data rates requires broad frequency bands, and sufficient broadband can be achieved in high...

Ngày tải lên: 14/08/2014, 09:21

... wireless devices in the 2.4-GHz band and other bands. • The IEEE 802.15.2 standard specifically addresses coexistence between WLAN and Bluetooth systems. This standard has adopted an adaptive frequency ... are separate and some- what different fast handover protocols for Mobile IPv4 (El Malki 2004) and Mobile IPv6 (Koodli 2003a). This chapter describes the overall architecture of...

Ngày tải lên: 14/08/2014, 09:21

... foreign agent in Mobile IPv4 and home agent in Mobile IPv4 and Mobile IPv6 are examples of routing proxies. A routing proxy obscures the mobile host’s location by allowing the mobile host to use a ... separate APIs, mobile terminal status and mobile terminal location. The mobile terminal status API allows applications to obtain the status of fixed, mobile, and IP-based...

Ngày tải lên: 14/08/2014, 09:21

... handsets and external resources (such as printers, vending machines, displays, and handsets), handsets and ubiquitous computing environments (such as offices, airports, and homes), and handsets and ... presented in Figure 7. 2 regarding to 2.5G /3G and XG phones. We will discuss advanced operating systems (Section 7. 3), runtime environments (Section 7. 4), security (Sectio...

Ngày tải lên: 14/08/2014, 09:21

... third generation standards groups, 3GPP 6 and 3GPP2 (cdma2000 Wireless IP Network Standards-Draft 2001). This section briefly addresses current 3G AAA schemes for all-IP networks. 3GPP The 3rd Generation ... bases (for example, 3GPP, 3GPP2, and WLAN hotspots), deployment considerations (for example, uniformity in standards-based 3G terminals versus variability in WLAN access device...

Ngày tải lên: 14/08/2014, 09:21

... 57 92 concepts 59–64 current technologies 57 58 evolving technologies 58 78 high-speed transmission in HSDPA 72 78 next- generation 78 –91 wideband CDMA 64 72 RADIUS AAA protocol 319–321 realtime ... OS mobile terminal software platform 1 97 PANA AAA protocol 323–328 parametric speech coding standards 228, 230–231 Parlay telecom API current standards 163–1 67 web and X-web servic...

Ngày tải lên: 14/08/2014, 09:21