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Praise for Fundamentals of WiMAX

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10.3 Protocol Layering Across a <strong>WiMAX</strong> Network 343R1 R6 R3 R5MS BS ASN-GW CSN CSNControl16CNTRLMACPHY16CNTRLMACPHYASNCNTRLIPLINKPHYGREIPLINKPHYASNASNCNTRLIPLINKPHYGREIPLINKPHYCSNCNTRLIPLINKPHYDataIP IP IP IP IPETH ETH ETH ETH IPETH-CSMACPHYETH-CSMACPHYLINKPHYCSNCNTRLIPLINKPHYIPIPLINKPHYIPLINKPHYIPLINKPHYFigure 10.3 Protocol stack <strong>for</strong> Ethernet convergence sublayer with routed ASNR1 R6 R3 R5MS BS ASN-GW CSN CSNControl16CNTRLMACPHYData16CNTRLMACPHYASNCNTRLIPLINKPHYGREIPLINKPHYASNASNCNTRLIPLINKPHYGREIPLINKPHYCSNCNTRLIPLINKPHYCSNCNTRLIPLINKPHYIP IP IP IP IP IP IPIP-CSMACPHYIP-CSMACPHYIPLINKPHYIPLINKPHYLINKPHYIPLINKPHYFigure 10.4 Protocol stack <strong>for</strong> IP convergence sublayer with routed ASNIn this case, if the ASN were a bridged network, the shaded layers would not be needed. It is alsopossible to transport Ethernet packets all the way up to the CSN by using the ETH-CS, in whichcase, an encapsulation protocol, such as GRE, may be used <strong>for</strong> <strong>for</strong>warding from the ASN to theCSN. This type <strong>of</strong> Ethernet service may be used to provide end-to-end VLAN (virtual local areanetworking) services.

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