By Son K. Dao (auth.), Yongguang Zhang Ph.D. (eds.)
Communications through satellite tv for pc introduces a couple of new technical difficulties for cellular networks and purposes. satellite tv for pc hyperlinks have essentially various houses from terrestrial stressed out or instant networks. many of the houses comprise better latency, bursty errors features, uneven power, and unconventional community structure. those transformations have far-reaching results on many satellite tv for pc conversation issues.
Internetworking and Computing over satellite tv for pc Networks's emphasis is on facts networking, internetworking and dispensed computing matters. the fabric surveys fresh paintings within the zone of satellite tv for pc networks, introduces sure state of the art applied sciences, and provides fresh examine ends up in those components. various matters related to functions, community structure, medium entry controls, multicast routing, uneven routing, delivery protocols, TCP functionality enhancement recommendations, facts broadcast, and data disseminations, are addressed. this can be one of many first books to be all for the internetworking and computing point of satellite tv for pc networks.
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Extra resources for Internetworking and Computing Over Satellite Networks
The satellite broadcasts to the stations on the downlink frequency band (different frequencies may be used for uplink and downlink transmissions). Satellites that do not have "onboard" processors, but simply echo whatever they receive from "on-theground" processing stations are called bent pipe satellites [Tanenbaum, 1996]. In contrast, there are satellites that have on-board processors. Downlink Channel l __--. --) Figure 3-1. Uplink and downlink channels in satellite communications Typically, transmissions on a satellite link can be classified into two types: those on the uplink and those on the downlink (refer to Figure 3-1).
The distances R" and R. depend on the location of the communicating stations with respect to the satellite at the time of consideration. For a geostationary satellite, the range over which the propagation time may vary is determined by considering two extreme cases [Maral and Bousquet, 1998]: 38 INTERNETWORKING AND COMPUTING OVER SATELLITE NETWORKS (I) The communicating stations are directly beneath the satellite: Ru = RD = Ro, where Ro is the altitude of the satellite (Ro = 35786 km); in this case tss =238 ms.
On the other hand, a centralized control scheme is one in which the channel allocation is done centrally at an arbiter. The arbiter explicitly allocates bandwidth to stations based on certain information (to be discussed) that is provided by the stations. Thus, in a centralized allocation scheme, the stations transmit "requests" to the arbiter, in response to which, the arbiter makes decisions with regards to channel allocation and includes this in "control information" that is transmitted back to the stations.