Mobile Cloud Networking and Mobility Control 127
traffic preferences and informs the HA of those preferences. The HA
then distributes the traffic destined for that mobile node via the
different CoAs in keeping with the stated preferences.
Figure 5.18. Registration of several CoAs in Mobile IPv6
5.8. Transport-level multihoming
In the classic transport protocols TCP and UDP, each terminal
uses a single address for a communication. If the terminal’s address
changes, the connection is interrupted. With the evolution of access
technology, it is quite common for a terminal to have several IP
addresses associated with its interfaces. The solutions put forward for
the transport level involve each terminal maintaining a list of
IP addresses. One address can be replaced by another without the
communication being broken. Transport-level multihoming protocols
are extensions of TCP such as MPTCP (Multipath TCP), Multihomed
TCP, TCP-MH, and SCTP (Stream Control Transmission Protocol).
In this section, we shall discuss the two most widely used standardized
protocols: SCTP and MPTCP.
5.8.1. SCTP (Stream Control Transmission Protocol)
Stream Control Transmission Protocol (SCTP) is a transport
protocol which was defined by the IETF in 2000 and updated in 2007.
Originally, this protocol was developed to transport voice signals on
the IP network. As it is a transport protocol, SCTP is equivalent to
other transport protocols such as TCP and UDP. SCTP offers better
www.it-ebooks.info