MOBILE TELECOMMUNICATIONS PROTOCOLS FOR DATA NETWORKS phần 1 potx

[...]... is studied in Chapter 8 The protocols supporting mobile communications, IEEE 802 .11 and Bluetooth, are described Routing protocols in mobile and wireless networks are presented in Chapter 9 Handoff in mobile networks is described in Chapter 10 Signaling traffic in wireless networks is studied in Chapter 11 Chapter 12 presents a two-phase combined handoff scheme in wireless networks About the Author... modulation for wireless LANs operating at bit rates up to 54 Mb s 1 at 5 GHz Wideband Code Division Multiple Access (WCDMA) uses 5-MHz channels and supports circuit and packet data access at 384 kb s 1 nominal data rates for macrocellular wireless access WCDMA provides simultaneous voice and data services WCDMA is the radio interface technology for Universal Mobile Telecommunications System (UMTS) networks Mobile. .. problems 1. 1: What are the core abstractions common to most platforms in the mobile agent paradigm? 1. 2: What are the requirements for the load control mechanisms? 1. 3: What are the advantages of using an agent-based approach to load control? Practice problem solutions 1. 1: The core abstractions common to most platforms in the mobile agent paradigm include agents, hosts, entry points, and proxies 1. 2:... object provides only a uniform, generic method to send messages, and therefore no proxy-generation utility is required 1. 1 .1 Grasshopper The Grasshopper platform consists of a number of agencies (hosts) and a Region Registry (a network-wide database of host and agent information) remotely connected via an Object Request Broker (ORB) Agencies represent the runtime environments for MAs Several agencies... users to wherever they roam 1. 1 MOBILE AGENT PLATFORMS Mobile Agent Technology (MAT) uses interworking between Mobile Agent Platforms (MAPs) Several MAPs are based on Java These platforms are Grasshopper, Aglets, Concordia, Voyager, and Odyssey Each MAP has a class library that allows the user to develop agents and applications The core abstractions are common to most platforms since they are inherent... Multimedia Applications Support for Wireless ATM Networks (2000) She is a member of the Editorial Board of the IEEE Transactions on Multimedia and is on the Editorial Advisory Board of Wiley’s International Journal of Network Management 1 Mobile agent platforms and systems Advanced service provisioning allows for rapid, cost-effective service deployment Modern mobile telecommunications evolve towards... simultaneously The AP can reside at any node on the wired network and performs as a gateway for wireless users’ data to be routed onto the wired network A wireless LAN is capable of operating at speeds in the range of 1 or 2, or 11 Mbps depending on the actual system These speeds are supported by the standard for wireless LAN networks defined by the international body, the IEEE The network communications... DISTRIBUTORS, and ALLOCATORS A simple network containing SSPs and 6 MOBILE AGENT PLATFORMS AND SYSTEMS Q Q Q • • • SCP1 SCP2 SCPN Q A D SSP1 SSP2 A A • • • Allocator D SS7 network Quantifier Distributor SSPM A Figure 1. 1 Agent-based load control strategy SCPs, each supporting all service types, is shown in Figure 1. 1 and is used to describe agent-based load control strategies Computational markets,... in Figure 1. 3 At intervals of length T , a mobile agent AB-ANT, where AB indicates ant-based strategy, is generated for every service type at every SSP in the network and sent to a selected SCP Each SSP maintains pheromone tables for each service type, which contain entries for all the SCPs in the network These entries are the normalized probabilities, Pi for choosing SCPi as the destination for an AB-ANT... SCP1 P1 SCP2 P2 SCP3 P3 P1 > P3 STP STP STP SS7 network STP STP STP STP • P2 > P3 • A SSP A SSP • • • SSP Figure 1. 3 Ant-based IN load control strategy A 9 SUMMARY times for the service type of interest Processing times reported are the processing time for the initial message of the service session and the sum of the processing times for all other messages The separation between the processing times for . Mobile Agent Platforms 1 1 .1. 1 Grasshopper 2 1. 1.2 Aglets 2 1. 1.3 Concordia 3 1. 1.4 Voyager 3 1. 1.5 Odyssey 3 1. 2 Multiagent Systems 3 1. 2 .1 Agent-based load control strategies 5 1. 3 Summary 9 Problems. 19 1 10 .8.2 Chaining followed by make-break 19 1 10 .9 Analysis of Chaining Handoff Approaches 19 3 10 .10 Summary 19 4 Problems to Chapter 10 19 4 11 Signaling Traffic in Wireless ATM Networks 19 7 11 .1. 14 1 8.3 .1 Direct sequence spread spectrum 14 1 8.3.2 Frequency hopping spread spectrum 14 2 8.3.3 WLAN industry standard 14 2 8.4 IEEE 802 .11 WLAN Architecture 14 3 8.4 .1 IEEE 802 .11 a and IEEE 802 .11 b 14 5 8.5