A time-based reservation scheme for managing handovers in satellite systems (original) (raw)
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ATCR: an adaptive time-based channel reservation mechanism for LEO satellite fixed cell systems
2003 IEEE 58th Vehicular Technology Conference. VTC 2003-Fall (IEEE Cat. No.03CH37484), 2003
In this paper, we propose an Adaptive Time-based Channel Reservation mechanism (ATCR) suitable for handover and call admission procedure control in future multi-services mobile satellite systems. These systems are characterized by a high rate of handover. While guaranteeing a null handover failure probability, by using a channel reservation strategy in the cells to be crossed by the user, ATCR optimizes the utilization of resources. The performance of our mechanism has been compared to other schemes. ATCR method has the advantage of a better channel utilization by sharing channels between users. An approximate analytical model has been developed, and its results have been validated through simulations.
Different queuing policies for handover requests in low Earth orbit mobile satellite systems
1999
In this paper, a mobility model suitable for low earth orbit mobile satellite systems (LEO-MSS's) has been presented, and its statistical parameters have been derived in order to evaluate the impact of the mobility on the performance of the fixed channel allocation (FCA) strategy. Moreover, we have foreseen that interbeam handover requests, which do not immediately find service, can be queued to reduce the handover failure rate. Two different queuing disciplines have been assumed: 1) the first-input-first-output (FIFO) scheme and 2) an idealized strategy that requires knowledge of the last useful instant (LUI) within which the handover procedure must be completed in order to rank the queued handover requests. An analytical approach has been developed to compare these queuing techniques, and its results have been validated through simulations.
Queuing of handover requests in low earth orbit mobile satellite systems
1996
This paper deals with a study on resource management strategies in Low Earth Orbit Mobile Satellite Systems (LEO-MSSs). A suitable mobility model has been proposed. Fixed Channel Allocation (FCA) has been considered. Moreover, we have foreseen that inter-beam handover requests, which do not immediately find service, can be queued in order to reduce the handover failure rate. An analytical approach has been developed to compare two different queuing disciplines and its results have been compared with simulations.
Dynamic time-based handover management in LEO satellite systems
Electronics Letters, 2007
In this letter, a handover scheme tailored for LEO satellite systems is proposed and evaluated. The proposed algorithm capitalizes upon the deterministic topology of this type of systems in order to increase channel utilization and diminish both blocking and forced termination probabilities.
Efficient Dynamic Channel Allocation Techniques with Handover Queuing for Mobile Satellite Networks
IEEE Journal on Selected Areas in Communications, 1995
Efficient dynamic channel allocation techniques with handover queuing suitable for applications in mobile satellite cellular networks, are discussed. The channel assignment on demand is performed on the basis of the evaluation of a suitable cost function. Geostationary and low earth orbit (LEO) satellites have been considered. In order to highlight the better performance of the dynamic techniques proposed, a performance comparison with a classical fixed channel allocation (FCA) has been carried out, as regards the probability that a newly arriving call is not completely served. It has also been shown that a higher traffic density, with respect to GEO systems, is manageable by means of LEO satellites.
IEE Proceedings - Communications, 1996
Different dynamic channel allocation (DCA) approaches based on the evaluation of a cost function are proposedl. The scenario considered is low earth orbit :and geostationary orbit mobile satellite systcnis. A suitable user mobility model has bcen defined to generate interbeam handover requests. Different alternatives to manage interbeaim handovers have been investigated. Among them, the most promising sohtion seems to be the queuing of handover requests. The quality of service parameters 1.hat have been considered are: blocking probability for new call arrivals, handover failure probability arid the probability of incompletcly served call owing to the initial blocking or to the failure of a subsequent handover request. Comparisons among the proposed DCA techniques and the fixed channel allocation technique have been (carried out to find a solution 1.hat represents a good trade-off between the blocking performance and the required signalling load.
IEEE Transactions on Vehicular Technology, 1998
It is anticipated that the satellite component of the future universal mobile telecommunications system (UMTS) will be based (partly or totally) on non-GEOstationary (non-GEO) constellations of satellites to serve mixed populations of users, each category being treated through different contracts stipulating different quality of service (QoS). In particular, we envisage a high-quality premium service which guarantees the success of each handover procedure, called guaranteed handover (GH) service, and a low-cost lower quality service called regular service, where handover failures are accepted provided that the probability of a call being unsuccessful does not exceed a given value. This paper proposes a strategy which eliminates forced call terminations due to handover failures, thus allowing the GH service. This procedure applies to low earth orbit (LEO) constellations using the satellite-fixed cell technique. An analytical model has been derived to calculate QoS parameters for a mixed population of GH and regular users. Providing both GH service to some users and regular service to other users requires an increased satellite capacity with respect to the case where all the users are served with the regular service; this capacity increase has been evaluated as a function of the percentage of GH users, the traffic load per cell, and the considered satellite mobility environment. The GH approach has been validated through the comparison with another scheme which envisages the queuing of handover requests for privileged users.
An Efficient Scheme to Reduce Handoff Dropping in LEO Satellite Systems
Wireless Networks, 2001
The problem of handoffs in cellular networks is compounded in a low earth orbit (LEO) satellite-based cellular network due to the relative motion of the satellites with respect to a stationary observer on earth. Typically, the velocity of motion of mobiles can be ignored when compared to the very high velocity of the footprints of satellites. We exploit this property of LEO satellite systems and propose a handoff scheme based on a channel sharing approach that results in a substantial decrease in handoff dropping. For the same handoff dropping performance, our scheme has significantly lower new call blocking probability than the conventional reservation scheme. We also present an analytical approximation that is in very good accord with simulation results.
On Channel Sharing Policies in LEO Mobile Satellite Systems
IEEE Transactions on Aerospace and Electronic Systems, 2018
We consider a low earth orbit (LEO) mobile satellite system with "satellite-fixed" cells that accommodates new and handover calls of different service-classes. We provide an analytical framework for the efficient calculation of call blocking and handover failure probabilities under two channel sharing policies, namely the fixed channel reservation and the threshold call admission policies. Simulation results verify the accuracy of the proposed formulas. Furthermore, we discuss the applicability of the policies in software-defined LEO satellites. Index Terms-Low earth orbit (LEO) satellite, mobile satellite system, channel sharing policies, call blocking, software-defined network.