A rate-adjusting congestion control scheme for satellite based packet switches (original) (raw)
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A fast packet switching satellite communication network
Ieee Infcom 91 the Conference on Computer Communications Tenth Annual Joint Comference of the Ieee Computer and Communications Societies Proceedings, 1991
A multibeam fast packet switching satellite communication network serving multiple zones is studied in this paper. The synchronous Time Division Multiple Access protocol (TDM) is use in transmitting messages in the uplink channels while the Asinchronous Time Division Multiple Access protocol (ATDM) is used in the downlink channels. Moreover, fast packet switching capabilities are assumed on-board the satellite. Alternatives for the architecture of the on-board fast packet switching fabric are considered. The perjormance of the considered approaches have been derived by theoretical analysis and computer simulations. A novel input queueing technique is also proposed and analyzed to show that it achives betterperformance with respect to the classical input queueing approach. Therefore, by means of the novel input queueing approach it is possible to lower the end-to-end delay without increasing the complexity of the on-board equipmnts. Work carried out under thefinancial suppofl of the National Research Council (C.N. R.) in the frame of the Telecommunication Project. packets attained switching while queueing is required for the other to wait for a later route.
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In this paper we address different downlink dynamic bandwidth allocation (DBA) techniques in a GEO stationary (GEO) satellite communication network. The goal is designing a low complexity system which can adapt to the terminal traffic requests. We investigate a possible way to increase the performance of the system by means of an interaction between on-board switching fabric (SF) and beam hopping (BH). We consider a system where an adaptive process provides uplink DBA, whereas a BH module works as downlink bandwidth allocator. Specifically, the BH module determines the number of carriers to be allocated to each downlink spot-beam on the basis of the traffic queues at the input of the SF. Simulation results show that the interaction between SF and BH is a good candidate to increase the performance of the system, since it allows reducing queue sizes in the satellite.
On-board closed-loop congestion control for satellite-based packet-switching networks
International Journal of Satellite Communications, 1994
NASA Lewis Research Center is currently investigating a satellite architecture that incorporates an on-board packet-switching capability. Because of the statistical nature of packet switching, arrival traffic may fluctuate, and thus it is necessary to integrate the congestion control mechanism as part of the on-board processing unit. This study focuses on the closed-loop reactive control. We investigate the impact of the long propagation delay on the performance, and propose a scheme to overcome the problem. The scheme uses a global feedback signal to regulate the packet arrival rate of the ground stations. In this scheme, the satellite continuously broadcasts the status of its output buffer and the ground stations respond by selectively discarding packets or by tagging the excessive packets as lowpriority. The two methods are evaluated by theoretical queueing analysis and simulation. The former is used to analyse the simplified model and to determine the basic trends and bounds, and the latter is used to assess the performance of a more realistic system and to evaluate the effectiveness of more sophisticated control schemes. The results show that the long propagation delay makes the closedloop congestion control less responsive. The broadcast information can only be used to extract statistical information. The discarding method needs carefully-chosen status information and a reduction function, and normally requires a significant amount of ground discarding to reduce the on-board packet loss probability. The tagging method is more effective since it tolerates more uncertainties and allows a larger margin of error in status information. It can protect the high-priority packets from excessive loss and fully use the down-link bandwidth at the same time.
Technical issues regarding satellite packet switching
International Journal of Satellite Communications, 1994
Many concepts for advanced communication satellite networks have recently been proposed. Critical technical issues relating to satellite packet switching for meshed very small aperture terminal networks and broadband networks are addressed. Hardware considerations, networking and testing issues are discussed.
Deploying Joint Beam Hopping and Precoding in Multibeam Satellite Networks with Time Variant Traffic
2018 IEEE Global Conference on Signal and Information Processing (GlobalSIP), 2018
This paper studies the application of Beam Hopping (BH) as a key enabler to provide high level of flexibility to manage scarce on-board resources, particularly power, based on the irregular and time variant traffic requests/demands distributed within the coverage of a satellite multibeam system. However, while high throughput full frequency reuse pattern is employed among beams, the performance of BH is significantly degraded due to the generated inter-beam interference, and applying precoding is essential. In this context, we propose Joint Precoding and BH (J-PBH) in a multibeam system. The proposed J-PBH has the following functionality: serving beams follows an illumination pattern where at consecutive time instants high-demand beams are served more often than low-demand beams. Then, a Zero Forcing precoding is employed aiming at equalizing inter-beam interference. Consequently, the proposed J-PBH flexibly manage on-board power resources between high-and low-demand beams. Numerical simulations are presented which validate the proposed J-PBH benefits.
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This work focuses on resource allocation and connection admission control (CAC) issues in broadband satellite networks. Broadband services can now be provided by satellite systems operating in the Ka band, due to the large bandwidth available at such frequencies. In this context, we propose a resource allocation algorithm which integrates three classes of services at the MAC layer: constant bit rate (CBR), bursty data, and best effort services. The double movable boundary strategy (DMBS) is proposed to establish a resource-sharing policy among these service classes over the satellite uplink channel. The DMBS is a dynamically controlled boundary policy which adapts the allocation decision to the variable network loading conditions. Connection-oriented and connectionless services can be supported by the system. The CAC and slot allocation decisions are taken at the beginning of each control period after monitoring the filling level of traffic request queues. A threshold level for the bursty data request queue is defined to regulate the CAC process. The impact of the queue threshold value on the performance of the DMBS allocation policy is particularly evaluated in this study. A dynamic variation of this value is also proposed to enhance the system response to interactive applications. We present a brief analytical formulation for the DMBS model, together with simulation study details and performance evaluation results. The obtained results indicate a good efficiency, in terms of overall channel throughput and CBR blocking probability, for both fixed and dynamic data queue threshold approaches. The dynamic approach, however, outperforms the fixed one in terms of overall encountered bursty data delay.
Scalable Proportional Bandwidth Allocation in Satellite Networks
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Abstract Future satellite communication systems proposed use geosynchronous (GEO) satellites, medium earth orbit (MEO), and low earth orbit (LEO) constellations with fast packet switching and quality of service (QoS) provisioning. In this paper, we present broadband GEO, MEO and LEO satellite network QoS models and simulated performance results. This paper proposes a new method of bandwidth allocation during congestion, called the proportional allocation of bandwidth (PAB).
A Dynamic Bandwidth Allocation Scheme for a Multi-spot-beam Satellite System
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A multi-spot-beam satellite is an attractive technique for future satellite communications since it can support high data rates by projecting high power density to each spot beam and can reuse a frequency in different cells to increase the total system capacity. In this letter, we propose a resource management technique adjusting the bandwidth of each beam to minimize the difference between the traffic demand and allocated capacity. This represents a reasonable solution for dynamic bandwidth allocation, considering a trade-off between the maximum total capacity and fairness among the spot beams with different traffic demands.
Optimum Beam Bandwidth Allocation Based on Traffic Demands for Multi-spot Beam Satellite System
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Multibeam satellite networks can extend the service coverage as deploying its spot beam. It is important to allocate the appropriate resources to downlink multibeams to prevent the unnecessary waste of resources in the satellite system. This paper presents an optimum beam allocation scheme for multi-spot beam satellite system, as beam bandwidth to be allocated is controlled dynamically. We apply the Lagrange theory to obtain the optimization formula for bandwidth allocation of each spot beam in order to meet the total bandwidth constraint. Eventually we can find out the optimum beam profile respect to bandwidth.