Conference Proceeding

A channel reservation algorithm for handover issues in LEO satellite systems based on a satellite-fixed cell coverage

Lab. PRiSM, Univ. de Versailles
Vehicular Technology Conference, 1988, IEEE 38th 02/2001; 4:2975 - 2979 vol.4. DOI:10.1109/VETECS.2001.944147 ISBN: 0-7803-6728-6 In proceeding of: Vehicular Technology Conference, 2001. VTC 2001 Spring. IEEE VTS 53rd, Volume: 4
Source: IEEE Xplore

ABSTRACT In this paper, we propose a channel reservation mechanism referred
to as time-based channel reservation algorithm (TCRA). The aim of TCRA
is to handle the handover issue in low Earth orbit satellite networks.
These systems face an important number of handover attempts due to the
high satellite velocity when placed in low orbits. The TCRA scheme uses
the deterministic satellite movement pattern to estimate the user
residence time in each cell to be crossed. Two versions of the algorithm
are proposed depending on whether the network disposes of a positioning
system or not. These versions of TCRA allow to guarantee a null handover
failure probability for the users. The performance of TCRA (with its two
versions) is examined by simulations and compared to the guard channel
scheme. The results show the behaviour of the schemes and their
performance in terms of new call and handover blocking probabilities

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    ABSTRACT: Third generation (3G) communication networks based on low Earth orbit (LEO) satellites provide a new trend in future mobile communications. LEO satellites provide lower end-to-end delays and efficient frequency spectrum utilization, making it suitable for personal communication services (PCS). However, ongoing communications using LEO satellite systems experience frequent handover due to high rotational speed of satellites. In this paper, we provide a comprehensive literature survey on proposed handover schemes for LEO satellite systems. We also present a detailed classification of handover schemes in the literature. Finally, we compare the handover schemes using different quality of service
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    ABSTRACT: Not Available
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    ABSTRACT: Low earth orbit (LEO) satellite systems gained considerable interest towards the end of the previous decade by virtue of some of the appealing features that are endowed with, such as low propagation delay and the ability to communicate with handheld terminals. However, after the limited commercial success of the flrst networks of this kind, future satellite net- works are now conceived as complementary rather than competitive to terrestrial networks. In this paper, we focus on one of the most in∞uential factors in system performance, that is, the handover of a call. First, we provide a succinct review of the handover strategies that have been proposed in the literature. Then we propose two difierent satellite handover tech- niques for broadband LEO satellite systems that capitalize upon the satellite diversity that a system may provide. The proposed schemes cater for multimedia tra-c and are based on the queuing of handover requests. Moreover, a deallocation scheme is also proposed according to which capacity reservation requests are countermanded when the capacity that they strive to reserve is unlikely to be used. Simulation studies further document and conflrm the positive characteristics of the proposed handover schemes.
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