Mobile Cloud Networking and Mobility Control 135
- CMT offers the algorithm DAC (Delayed ACK for CMT) to
reduce acknowledgement traffic. DAC enables the CMT to delay the
acknowledgement, even if the packets arrive out of sequence. As the
sending of acknowledgements is often reported, the transmitter must
closely analyze each acknowledgement received to detect any loss of
data as quickly as possible. For this reason, in each acknowledgement,
the receiver informs the transmitter of the number of data packets it
has received since the sending of the least acknowledgement. This
proposition requires modifications to be made to both transmitter and
receiver.
5.8.3. MPTCP (Multipath TCP)
TCP is the most widely used transport protocol by Internet-based
applications, but this protocol does not support multihoming. In spite
of the existence of different paths, each TCP connection is limited to
serving only one path for transmission. The simultaneous use of
several paths for the same TCP session could improve data rate and
offer better performances by strengthening the reliability of the
connection. Multipath TCP, defined by the IETF, is a modified
version of TCP which supports multihoming and allows the
simultaneous transmission of data along several paths. As MPTCP is
compatible with TCP, there is no need to modify existing applications
to use its services. MPTCP is designed to gather together several
independent TCP flows in a single MPTCP connection, ensuring
transparency for the upper layers.
5.9. Conclusion
Mobile Cloud Networking is a paradigm which is growing
enormously in importance, with the development of mobile terminals
which are often not very powerful in comparison to the demand of
certain applications. Mobile Cloud is another paradigm where clients
come together to form a Cloud. As yet, this solution is not widely
used, but it is likely to increase with the installation of more powerful
boxes in vehicles.
www.it-ebooks.info
- CMT offers the algorithm DAC (Delayed ACK for CMT) to
reduce acknowledgement traffic. DAC enables the CMT to delay the
acknowledgement, even if the packets arrive out of sequence. As the
sending of acknowledgements is often reported, the transmitter must
closely analyze each acknowledgement received to detect any loss of
data as quickly as possible. For this reason, in each acknowledgement,
the receiver informs the transmitter of the number of data packets it
has received since the sending of the least acknowledgement. This
proposition requires modifications to be made to both transmitter and
receiver.
5.8.3. MPTCP (Multipath TCP)
TCP is the most widely used transport protocol by Internet-based
applications, but this protocol does not support multihoming. In spite
of the existence of different paths, each TCP connection is limited to
serving only one path for transmission. The simultaneous use of
several paths for the same TCP session could improve data rate and
offer better performances by strengthening the reliability of the
connection. Multipath TCP, defined by the IETF, is a modified
version of TCP which supports multihoming and allows the
simultaneous transmission of data along several paths. As MPTCP is
compatible with TCP, there is no need to modify existing applications
to use its services. MPTCP is designed to gather together several
independent TCP flows in a single MPTCP connection, ensuring
transparency for the upper layers.
5.9. Conclusion
Mobile Cloud Networking is a paradigm which is growing
enormously in importance, with the development of mobile terminals
which are often not very powerful in comparison to the demand of
certain applications. Mobile Cloud is another paradigm where clients
come together to form a Cloud. As yet, this solution is not widely
used, but it is likely to increase with the installation of more powerful
boxes in vehicles.
www.it-ebooks.info