Mobile Agentbased Service Configuration

MAT allows for object migration and supports Virtual Home Environment (VHE) in the Universal Mobile Telecommunications System (UMTS). VHE uses MAs in service subscription and configuration. UMTS supports QoS, the Personal Communication Support (PCS), and VHE. The VHE allows for service mobility and roaming for the user, which carries subscribed and customized services while roaming. During the registration procedure, the VHE enables the visited network to obtain the information about the user's...

Wideband wireless data access based on OFDM and dynamic packet assignment

OFDM has been shown to be effective for digital audio and digital video broadcasting at multimegabit rates. The IEEE 802.11 standards group chose OFDM modulation for Wireless LANs operating at bit rates up to 54Mbs-1 at 5 GHz. OFDM has been widely used in broadcast systems, for example, for Digital Audio Broadcasting (DAB) and for Digital Video Broadcasting (DVB). OFDM was selected for these systems primarily because of its high spectral efficiency and multipath tolerance. OFDM transmits data...

Bluetooth

Bluetooth devices operate at 2.4GHz in the ISM band. The operating band of 83.5 MHz is divided into 1-MHz channels, each signaling data at 1M Symbols per second to obtain 1 Mb s-1 available channel bandwidth by using Gaussian Frequency Shift Keying (GFSK). Bluetooth devices use FHSS, and each time slot lasts 625 s. The radio power ranges for Bluetooth applications are 10 m, 20 m, and 100 m, for different power classes. Bluetooth devices operate in two modes, as a master or as a slave. The...

Tabledriven Routing Protocols

In table-driven routing protocols, each node maintains one or more tables containing routing information to every other node in the network. All nodes update these tables so as to maintain a consistent and up-to-date view of the network. When the network topology changes, the nodes propagate update messages throughout the network in order to maintain a consistent and up-to-date routing information about the whole network. These routing protocols differ in the method by which the information...

Agentbased Service Implementation

Distributed Object Technology (DOT) provides a Distributed Processing Environment (DPE) to enable designers to create object-oriented distributed applications, which are not necessarily aware of the physical layout of the underlying network structure hidden by platform services. DOT-based specifications of DPEs, like CORBA 2.0, have been adopted by the Telecommunications Information Networking Architecture (TINA) Consortium as the basis for the distributed architecture. Mobile Agent Technology...

Wireless Application Protocol

The WAP architecture provides a scalable and extensible environment for application development for mobile communication devices. The WAP protocol stack has a layered design, and each layer is accessible by the layers above and by other services and applications. The WAP layered architecture enables other services and applications to use the features of the WAP stack through a set of well-defined interfaces. External applications can access the session, transaction, security, and transport...

Wireless Applications And Devices

Providing Internet and World Wide Web (WWW) services on a wireless data network presents many challenges because most of the technology developed for the Internet has been designed for desktop and larger computers that support medium to high bandwidth connectivity over generally reliable data networks. Mobile and wireless devices are usually handheld devices, and accessing the WWW presents a more constrained computing environment compared to desktop computers because of fundamental limitations...

Ondemand Routing Protocols

In contrast to table-driven routing protocols, all up-to-date routes are not maintained at every node instead, the routes are created as and when they are required. When source wants to send a packet to destination, it invokes the route discovery mechanisms to find the path to the destination. The route remains valid till the destination is reachable or until the route is no longer needed. 9.2.1 Temporally ordered routing algorithm Temporally Ordered Routing Algorithm (TORA) is a distributed...

Virtual Lans

Virtual LANs provide support for workgroups. A LAN consists of one or more LAN segments, and hosts on the same LAN segment can communicate directly through Layer 2 link layer without a router between them. These hosts share the same Layer 3 network layer subnet address, and communication between the hosts of one LAN segment remains in this segment. Thus Layer 3 network layer subnet address forms a broadcast scope that contains all hosts on the LAN segment. The workgroups are groups of hosts...

Signal stabilitybased adaptive routing

Signal Stability-Based Adaptive Routing SSA is a variant of the AODV protocol to take advantage of information available at the link level. Both the signal quality of links and link congestion are taken into consideration when finding routes. It is assumed that links with strong signals will change state less frequently. By favoring these strong signal links in route discovery, it is hoped that routes will survive longer and the number of route discovery operations will be reduced. Link signal...

Wireless Atm Architecture

A WATM network is intended to support integrated broadband services to MTs through an ATM User Network Interface UNI . Figure 12.1 shows a network diagram that illustrates various network entities and the functions that are required to support mobility in such an ATM network. In this architecture, the MT is an ATM end system that can support multimedia applications. The wireless link between the MT and BS provides the desired ATM transport services to the MT. A mobility-enhanced signaling...

Broadband Radio Access Integrated Network

Inoue et al. present the BRAIN for millimeter wave band multimedia communications. In BRAIN, all APs need to have only an OE converter because BRAIN incorporates radio-on-fiber technologies that allow for transmitting radio signals through optical fiber cables. Reservation Based Slotted Idle Signal Multiple Access RS-ISMA is a wireless access protocol designed for wireless multimedia communications and implemented in the BRAIN indoor-LAN prototype. In addition, a compact Radio Frequency RF...

Problems To Chapter

After completing this chapter you are able to demonstrate an understanding of different wireless protocols. explain a MAC protocol for wireless LAN. explain implementation of BRAIN architecture. explain the HAMAC protocol. demonstrate an understanding of demand assignment multiple access protocols. explain the role of a Request Table in ARCMA. explain implementation of multiple RA channels. 4.1 What is the role of network and native service access points 4.3 What are the functions of HAMAC...

Ccpp Exchange Protocol Based On The Http Extension Framework

The CC PP framework is a mechanism for describing the capabilities and preferences associated with users and user agents accessing the World Wide Web. Information about user agents includes the hardware platform, system software, applications, and user preferences P3P . The user agent capabilities and preferences can be thought of as metadata, or properties and descriptions of the user agent's hardware and software. The CC PP descriptions are intended to provide information necessary to adapt...

ATM networks

Handoff algorithms in terrestrial wireless networks focus on the connection rerouting problem. Basically, there are three connection rerouting approaches full connection establishment, partial connection reestablishment, and multicast connection reestablishment. Full connection establishment algorithms calculate a new optimum route for the call as for a new call request. The resulting route is always optimal however, the call rerouting delay and the signaling overheads are high. To alleviate...

Wap Push Architecture

Comparison Pull And Push Technology

The WAP Push framework introduces a means within the WAP effort to transmit information to a device without a previous user action. In the client server model, a client requests a service or information from a server, which transmits information to the client. In this pull technology, the client pulls information from the server. An example of pull technology is WWW, in which a user enters a URL the request , sent then to a server, which answers by sending a Web page the response to the user....