ion Figure 3: Ad-Hoc Network of Mobile Hosts is a bi-directional edge between two nodes if the hosts corresponding to these nodes can directly communicate with each other. 3.2 Mobility Management Problem In the current existing proposals for mobile wireless networks, routing information of each mobile host is maintained in some database (HLR and VLR in IS-41 [4], home agent and foreign agent in mobile IP [21, 22]) located in the static network. However, there is no such database available for ad-hoc networks. The routing information will thus be maintained at the mobile hosts to assist in forwarding packets to other hosts. The problem at hand is the complexity of updating the routing information in such a dynamic network. The dynamism in the network is due to the mobility of the hosts, and limited battery power of the hosts. Due to limited battery power, the users will often disconnect the hosts to conserve power. 3.2.1 Performance Metrics ffl Convergence characteristics : The time...

This article deals with the application of a network management framework, called Simple Network Management Protocol (SNMP), to manage a particular type of network devices named Terminal Node Controller (TNC). TNCs are widely used in the amateur packet radio community. We present new tools based on SNMP for remote management of TNCs. A Management Information Base (MIB) has been created for the TNCs parameters we manage in KISS mode. The MIB is implemented under the Linux operating system and uses the CMU-SNMP package. We implemented also a new command to manage simultaneously and remotely several TNC parameters. Keywords: Network management, terminal node controller, management information base, Linux. 1 Introduction The number of users accessing amateur packet radio is growing from day to day. Managers of telecommunications equipment are called to pay more attention to these pieces of equipment in order to exploit them in a better way. So far, managers were obliged to be close to th...

The standard amateur packet radio protocol, AX.25, provides the end-user with a virtual circuit interface to the link layer, while implementing this using packets, and using a CSMA medium access control mechanism. This paper suggests that the link layer in this application area should be separated into 3 layers (LLC, MAC and Physical Layer), and a set of modular protocols for each part be designed for amateur radio use. A new simplified Logical Link Control layer, DUAL, is described, which is not only more suitable than AX.25 for the transmission of higher-layer traffic, but also more bandwidth-efficient. This is achieved by using link layer addresses tailored to the network protocol used, minimizing the link layer overheads, and by incorporating a modified IP header compression scheme adapted for use in a multi-point environment. Omid Mohammadi, Internet e-mail: omidm@cs.adfa.oz.au Warren Toomey, Internet e-mail: wkt@cs.adfa.oz.au AMPRnet e-mail: vk1xwt@minnie.vk1xwt.ampr.org BBS e...

Scalable Multi-Channel Networks: Architectures and Protocols Duanyang Guo (Advisor: Professor Anthony S. Acampora) Multi-channel networks allow concurrent data transmissions at each network station and promise to overcome the fundamental limitation of the single-channel networks that the network throughput is bounded by the transmission rate supported by electronics at any one of the end-stations. Examples of multi-channel networks include WDM lightwave networks, mobile wireless networks and VPbased ATM networks. In this dissertation, we study the design and operation of multi-channel networks. First, we study the central issue of ATM-based singlehop WDM lightwave networks, the sender-receiver coordination of cell (packets) transmission. We present new protocols to significantly reduce the tuning overhead and the control signaling demand, allowing the networks to support more network stations cost-effectively while improving the network performance. A new synchronization scheme allo...

An ad-hoc wireless network is a cooperative set of mobile hosts which can communicate with each other over the wireless links (direct or indirect) without any static network interaction.

2 Application analysis..................................................................................... 2 2.1 Background and circumstances............................................................................. 2 2.2 Usage of a distributed health care information system............................................ 2