Experimental Results of a Demand-Assignment Thin Route Tdma System

Int. J. Satell. Commun.

Potortì

1997

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Most demand assignment time division multiple access (TDMA) satellite access protocols use centralized‐control access schemes, rather than distributed ones, because their simplicity and robustness usually compensates for the longer allocation delay. Starting from the fifo ordered demand assignment/information bit energy adapter (FODA/IBEA) centralized‐control protocol, we studied two distributed‐control protocols, named distributed allocation with request in fixed slots (DRIFS) and faded environments effective distributed engineering redundant signalling (FEEDERS) respectively, for accessing a geostationary satellite channel. Multimedia traffic and faded environments were considered in the study of both access schemes. This paper presents the DRIFS proposal, together with the recovery procedures from critical events, the handling of which is central to the discussion of a distributed satellite access protocol. Probabilities of such events are also estimated. © 1997 John Wiley & Sons, Ltd.

Section: Introductionmentioning

confidence: 99%

DRIFS-TDMA: a proposal for a satellite access distributed-control algorithm for multimedia traffic in a faded environment

Int. J. Satell. Commun.

Potortì

1997

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“…At each earth station, two basic traffic types are supposed to be present: (i) guaranteed bandwidth, real time, synchronous traffic (stream traffic), generated by voice and video applications, and (ii) non-guaranteed bandwidth, non-real time, asynchronous traffic (datagram traffic), produced by data applications. Some previous work in this setting has been done in References [2,11], where, however, a centralized control case is…”

mentioning

confidence: 99%

Static and dynamic resource allocation in a multiservice satellite network with fading

Davoli

2003

Satell Commun Network

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SUMMARYA control architecture for resource allocation in satellite networks is proposed, along with the specification of performance indexes and control strategies. The latter, besides being based on information on traffic statistics and network status, rely upon some knowledge of the fading conditions over the satellite network channels. The resource allocation problem consists of the assignment, by a master station, of a total available bandwidth among traffic earth stations in the presence of different traffic types. Traffic stations are assumed to measure continuously their signal fade level, but this information may either be used only locally or also communicated to the master station. According to the information made available on-line to the master station on the level of the fading attenuation of the traffic stations, the assignment can be made static, based on the a priori knowledge of long-term fading statistics, or dynamic, based on the updated measurements. In any case, the decisions can be adapted to slowly time-varying traffic characteristics. At each earth station, two basic traffic types are assumed to be present, namely guaranteed bandwidth, real time, synchronous data (stream traffic) and best-effort traffic (datagram traffic). Numerical results are provided for a specific architecture in the dynamic case, in a real environment, based on the Italsat satellite national coverage payload characteristics.

Delay analysis for interlan traffic using two suitable TDMA satellite access schemes

Int. J. Satell. Commun.

Potortì

et al. 1997

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Two demand assignment time division multiple access (TDMA) satellite access schemes that are suitable for providing flexible interconnections of local area networks are compared by means of two simulations; Fifo Ordered Demand Assignment/Information Bit Energy Adaptive (FODA/IBEA) and Combined Fixed Reservation Assignment (CFRA). A unique simulation tool was used, a meshed network of very small aperture terminals (VSATs) under the control of a master station was considered and similar networking conditions were applied to both access schemes. The generated traffic had two components with different level of burstiness; bulk traffic and interactive traffic. The performance evaluated is the delay for each traffic component. We show that CFRA is best when connecting clusters of only a few stations and even individual stations exchanging light traffic. On the other hand, FODA/IBEA is better suited to interconnect networks, or within networks with many hosts, where heavy traffic is more likely. © 1997 John Wiley & Sons, Ltd.