CiteULike: erl's gw_positioning

Providing full connectivity in large ad-hoc networks by dynamic placement of aerial platforms

K Chandrashekar — 2007-11-10T20:47:35-00:00

Military Communications Conference, 2004. MILCOM 2004. IEEE, Vol. 3 (2004), pp. 1429-1436 Vol. 3.

In this paper we address the problem of providing full connectivity to disconnected ground MANET nodes by dynamically placing unmanned aerial vehicles (UAVs) to act as relay nodes. We provide a heuristic algorithm to find the minimal number of such aerial vehicles required to provide fall connectivity and find the corresponding locations for these aerial platforms (UAVs). We also track the movement of the ground nodes and update the location of the UAVs. We describe a communication framework that enables the ground nodes to communicate with its peer ground nodes as well as the UAVs that act as relay nodes. The communication architecture is designed to work with existing MANET routing protocols.

Capacity of Ad Hoc wireless networks

Jinyang Li — 2005-09-28T00:13:46-00:00

(2001), pp. 61-69.

Throughput capacity of random ad hoc networks with infrastructure support

Ula? Kozat — 2005-11-09T00:19:57-00:00

(2003), pp. 55-65.

A Survey of Mobility Models for Ad Hoc Network Research

T Camp — 2006-06-26T09:49:38-00:00

Wireless Communications & Mobile Computing (WCMC): Special issue on Mobile Ad Hoc Networking: Research, Trends and Applications, Vol. 2, No. 5. (2002), pp. 483-502.

In the performance evaluation of a protocol for an ad hoc network, the protocol should be tested under realistic conditions including, but not limited to, a sensible transmission range, limited buffer space for the storage of messages, representative data traffic models, and realistic movements of the mobile users (i.e., a mobility model). This paper is a survey of mobility models that are used in the simulations of ad hoc networks. We describe several mobility models that represent mobile...

An analysis of the optimum node density for ad hoc mobile networks

EM Royer — 2007-10-03T11:27:31-00:00

Communications, 2001. ICC 2001. IEEE International Conference on, Vol. 3 (2001), pp. 857-861 vol.3.

An ad hoc mobile network is a collection of nodes, each of which communicates over wireless channels and is capable of movement. Wireless nodes have the unique capability of transmission at different power levels. As the transmission power is varied, a tradeoff exists between the number of hops from source to destination and the overall bandwidth available to individual nodes. Because both battery life and channel bandwidth are limited resources in mobile networks, it is important to ascertain the effects different transmission powers have on the overall performance of the network. This paper explores the nature of this transmission power tradeoff in mobile networks to determine the optimum node density for delivering the maximum number of data packets. It is shown that there does not exist a global optimum density, but rather that, to achieve this maximum, the node density should increase as the rate of node movement increases

A study into the practical issues related to a deployed ad hoc wireless sensor network

EL Kuan — 2007-10-03T09:31:57-00:00

Wireless Communications and Networking Conference, 2005 IEEE, Vol. 4 (2005), pp. 1952-1957 Vol. 4.

This paper investigates the practical issues related to the energy efficiency of a deployed wireless sensor network through the use of network simulations. The IEEE 802.11b standard is used as the communications technology and the dynamic source routing algorithm provides the mechanism for generating the communications routes from data sources to data sinks. The study looks into the optimal position for a gateway node in a deployed network and also investigates methods of distributing the network load evenly across the network.

Positioning range extension gateways in mobile ad hoc wireless networks to improve connectivity and throughput

M Ahmed — 2007-10-02T10:57:20-00:00

Military Communications Conference, 2001. MILCOM 2001. Communications for Network-Centric Operations: Creating the Information Force. IEEE, Vol. 1 (2001), pp. 331-335 vol.1.

The dynamic nature of a mobile ad hoc network (MANET) may result in a cluster of nodes being isolated from the remaining network, especially when deployed in a terrain with blockages. In order to facilitate scalability and to provide connectivity between partitions that might occur in wireless networks as a consequence of mobility, we can envision a 'range extension' network that consists of airborne communication platforms, or geostationary/low-Earth-orbit satellites. These airborne/satellite nodes maintain communication links with specific 'gateway' nodes among the mobile ground nodes. To communicate with a node that is geographically distant or belongs to a different network partition, an ad hoc node can relay its data packets through an appropriate mobile gateway and via the range extension network. If we envision that the MANET is divided into different groups and a mobile gateway is deployed for each such group, an objective then is to determine the trajectory of the mobile gateway to best serve the ad hoc group to which it belongs, in terms of network performance metrics such as throughput and latency. In this paper, this problem of computing the optimal position for a gateway is reduced to a linear optimization problem by means of some simplifying but realistic assumptions. We suggest methods that may be deployed to enable the gateway to follow this optimal trajectory as closely as possible (within the practical constraints imposed by its velocity and maneuverability). Simulation results for various scenarios show a 10-15% improvement in the throughput and latency, per gateway domain, if a gateway has a dynamic trajectory whose locus follows the computed optimal position, as compared to a gateway that is statically placed at a regular position, or to a gateway that has a random trajectory.

An architecture for providing range extension by deploying mobile gateways in ad hoc networks

M Ahmed — 2007-10-02T09:22:27-00:00

Personal, Indoor and Mobile Radio Communications, 2002. The 13th IEEE International Symposium on, Vol. 4 (2002), pp. 1660-1664 vol.4.

The dynamic nature of a mobile ad hoc network (MANET) may result in a cluster of nodes being isolated from the rest of the network, especially when deployed in a terrain with blockages. To provide connectivity between the partitions of an ad hoc network that might occur due to mobility, a 'range extension' network can be employed. Such a network might consist of airborne communication platforms, or geostationary/low-Earth-orbit satellites maintaining communication links with specific 'gateway' nodes that are dispersed among the mobile ground nodes. Thus, to communicate with a node that is geographically distant or belongs to a different network partition, an ad hoc node can relay its data packets through an appropriate mobile gateway and via the range extension network. In such an architecture, MANET is divided into different domains with a mobile gateway deployed for each domain. The objective, then, is to determine the position and trajectory of the gateways to optimize network performance metrics such as throughput and latency. In this paper, computation of the optimal position for a gateway is shown to be equivalent to a linear optimization problem by means of some simplifying but realistic assumptions. An algorithm is proposed for the control of the gateway trajectory. The practical constraints imposed by the velocity and maneuverability of the gateways are taken into account. Simulation results show a 10-15% improvement in the throughput and latency, per gateway domain, if a gateway has a dynamic trajectory whose locus follows the computed optimal position, as compared to a gateway that is statically placed at a fixed position, or to a gateway that has a random trajectory.