SHAPING THE FUTURE OF SATELLITE COMMUNICATIONS
8.4.3 Processing Mode 3 - Eth(IP)<->Air(GSE)
The processing mode “Eth(IP))<->Air(GSE)” is used in applications where
bandwidth efficiency is important, such as IP backbone or IP trunking applications.
GSE is necessary on both ends of the transmission chain as no interoperability
tests are performed up till September 2010).
GSE carries "native" IP content with a significant reduction in overhead compared
to using MPE (Multi Protocol Encapsulation).
IP datagram’s, Ethernet Frames, or other network layer packets, which are
scheduled for transmission, are encapsulated in one or more GSE Packets (we
refer to Figure 69). The encapsulation process delineates the start and end of each
network-layer PDU (Protocol Data Unit), adds control information such as the
network protocol type and address label, and provides an overall integrity check
when needed.
Figure 69 - GSE Layer
GSE guarantees that no fragmentation at the IP layer occurs. Fragmentation (if
any) needed to adapt to the DVB broadcast bearer’s baseband frames is
performed entirely within the GSE layer and thus hidden from the IP layer. The
reassembly process is robust against loss of baseband frames.
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