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 homes from terrestrial stressed or instant networks. the various homes comprise better latency, bursty blunders features, uneven strength, and unconventional community structure. those ameliorations have far-reaching results on many satellite tv for pc verbal exchange issues.
Internetworking and Computing over satellite tv for pc Networks's emphasis is on info networking, internetworking and disbursed computing matters. the fabric surveys contemporary paintings within the zone of satellite tv for pc networks, introduces sure state of the art applied sciences, and offers fresh study ends up in those parts. a number of matters concerning purposes, community structure, medium entry controls, multicast routing, uneven routing, delivery protocols, TCP functionality enhancement concepts, info broadcast, and data disseminations, are addressed. this is often one of many first books to be eager about 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 rosette constellation, where the coverage of satellites in different orbital planes overlaps, provides its best coverage with visibility of mUltiple satellites from a single ground terminal at the mid-latitudes where most human population lies, but does not cover the poles from LEO. This multiple visibility and availability of multiple physical channels is known as 'diversity'. Globalstar uses CDMA recombination of the multiple signal paths between handset and ground station, provided by the overlapping coverage of 'repeater' satellites, to enable diversity to combat shadowing.
The simpler approaches have separate heterogenous ground networks using passing satellites to complete their radio links. A more complex homogenous autonomous system, built from a space-based network using intersatellite links and smart switching satellites, may peer with terrestrial autonomous systems. This is the fundamental difference in satellite network design approaches between the ground-based Globalstar satellite networks and the interconnected Iridium satellites, or between the Skybridge and Teledesic proposals, and is shown using classical network layering in Figure 2-2 and Figure 2-3.
Each protocol has its advantages and limitations. It is seen that there exists no protocol that performs better than all the other protocols over the entire range of performance criteria. The rest of this chapter will survey MAC protocols in each of these categories. Medium Access Control Protocols for Satellite Communications 2. 41 POLLING BASED ACCESS PROTOCOLS One way of arbitrating channel access among competing stations is for a centralized controller to poll them. Having the satellite poll each station in tum, to see if it has a packet to send is prohibitively expensive, given, the 270 ms time required for each polVresponse sequence.