Development of Global Geographical Coverage Area for Terrestrial Networks Internetworked with Leo Satellite Network (original) (raw)

Improved algorithms for Internet routing in Low Earth Orbit satellite networks

The paper proposes enhanced algorithms for two of the three basic steps in Low Earth Orbit (LEO) satellite network routing: the downlink routing and the inter-satellite links (ISLs) routing. In this study we refer to polar/near-polar constellations and to connectionless routing protocols such as the ones based on the Internet Protocol (IP). In particular a downlink routing procedure is proposed that does not exploit any external localization system to identify the position of the destination mobile terminal. In addition, an ISL routing algorithm is proposed that improves the one based on the minimization of the number of hops, by reducing the overall path length of the connection and, hence, the end-to-end delay. The improved algorithms are evaluated in terms of system performance and computational burden. At the price of a neglectable increase in the computational complexity, a significant improvement in the end-to-end delay is achieved by using the proposed algorithm, when the source and the destination interface are largely spaced in latitude and longitude, with a consequent benefit on the overall LEO network efficiency.

A proposal of optimal routing techniques for non-GEO satellite systems

International Journal of Wireless Information …, 2001

The continuously increasing number of mobile subscribers has generated a strong interest in expanding terrestrial wireless networks and supporting real-time communications regardless of the user location. These targets require a cautious management of available resources since the development of global systems implies a quite high cost. Routing is an important network function and must be very carefully considered. This paper proposes the implementation of optimal routing techniques for connection oriented mode and variable network topology, as non-GEO satellite systems require. In particular a well known optimal routing technique, named Flow Deviation, is modified by adding new procedures that render its applicability to a handover environment feasible and effective. Its performance is investigated through extended real time simulations in terms of delay, throughput, link utilization and also in terms of parameters related to the topology variations and the interruptible operation of ISLs. The pros and cons of the proposed scheme are discussed with respect to the well known shortest path scheme and helpful conclusions for the design of satellite constellations are obtained.

On effectiveness of routing algorithms for satellite communication networks

Sensors and Systems for Space Applications VI, 2013

For worldwide, a satellite communication network is an integral component of the global networking infrastructure. In this paper, we focus on developing effective routing techniques that consider both user preferences and network dynamic conditions. In particular, we develop a weighted-based route selection scheme for the core satellite communication network. Unlike the shortest path routing scheme, our scheme chooses the route from multiple matched entries based on the assigned weights that reflect the dynamic condition of networks. We also discuss how to derive the optimal weights for route assignment. To further meet user's preference, we implement the multiple path routing scheme to achieve the high rate of data transmission and the preemption based routing scheme to guarantee the data transmission for high priority users. Through extensive simulation studies, our data validates the effectiveness of our proposed routing schemes. Downloaded From: http://ebooks.spiedigitallibrary.org/ on 09/09/2014 Terms of Use: http://spiedl.org/terms Proc. of SPIE Vol. 8739 87390Q-2 Downloaded From: http://ebooks.spiedigitallibrary.org/ on 09/09/2014 Terms of Use: http://spiedl.org/terms

Satellite grouping and routing protocol for LEO/MEO satellite IP networks

Proceedings of the 5th ACM international workshop on Wireless mobile multimedia - WOWMOM '02, 2002

The rapid growth of Internet-based applications pushes broadband satellite networks to carry on IP traffic. In previously proposed connectionless routing schemes in satellite networks, the metrics used to calculate the paths do not reflect the total delay a packet may experience. In this paper, a new Satellite Grouping and Routing Protocol (SGRP) is developed. It divides Low Earth Orbit (LEO) satellites into groups according to the the footprint area of the Medium Earth Orbit (MEO) satellites in each snapshot period. Based on the delay reports sent by LEO satellites, MEO satellite managers compute the minimum-delay paths for their LEO members. The snapshot and group decision method is detailed, the performance of SGRP is evaluated through simulations and analysis.

Various Routing Techniques for non-GEO Satellite Constellations

International Conference on Telecommunications (ICT'00)

Two different routing algorithm categories are studied in this paper for a typical LEO satellite constellation. Shortest path algorithms and optimal routing. Their performance is investigated through extended real time simulations. In the context of satellite constellations the basic parameters for a typical network such as delay, throughput, link utilization must be supplemented by new factors imposed by the nature of satellite operation, like the handover procedures, the non-uniformity of load distribution in the space segment and the continuous topology variation. The pros and cons of the techniques are illustrated and helpful conclusions for the network design are provided.

MLSR: a novel routing algorithm for multilayered satellite IP networks

Networking, IEEE/ACM …, 2002

Several IP-based routing algorithms have been developed for low-Earth orbit (LEO) satellite networks in recent years. The performance of the satellite IP networks can be improved drastically if multiple satellite constellations are used in the architecture. In this work, a multilayered satellite IP network is introduced that consists of LEO, medium-Earth orbit (MEO), and geostationary Earth orbit (GEO) satellites. A new multilayered satellite routing algorithm (MLSR) is developed that calculates routing tables efficiently using the collected delay measurements. The performance of the multilayered satellite network and MLSR is evaluated through simulations and analysis.

Routing in Low Earth Orbit Satellite Systems Based on the Optimization

2008 IEEE Globecom Workshops, 2008

Since the satellites become more common for today's communication area, the process and the improvements in the satellite networks are gaining importance. One of the challenges in satellite networks is the routing operation between two end nodes, because, these networks have dynamic changing satellite movements. During these movements, a satellite can give its coverage area service order to one of its neighboring satellites. Also some calls can be blocked when the call densities exceed the communication link's capacities or the signals interfere with each other. All of these situations make the routing operation quite complicated. In this study, we design a new routing algorithm for Low-earth orbit (LEO) satellite systems. We use dynamic satellite topologies containing different number of nodes. We apply the genetic algorithms during the optimization steps. We introduce a new objective function including the delay and the aging factor as the characteristic properties of the paths. Finally, we compare the paths with each other and select the optimal path having the best fitness value.