Performance Evaluation of L3 Transport Protocols for IEEE (2 nd round) Richard Rouil, Nada Golmie and David Griffith National Institute of Standards and Technology

Outline MIH transport issues investigated Simulation scenarios Performance evaluation results –UDP without MIH ACK (for reference) –UDP with MIH ACK –TCP evaluation Conclusions

MIH Transport Issues Investigated Transport protocol type –UDP –TCP PoS Location –RTT between the MIH nodes Message parameters –Size –Rate Network conditions –Link congestion Priority queuing Retransmission timeout Fragmentation Congestion & rate control

Mobility scenarios Varying the RTT between the MN and the MoS addresses all 4 scenarios identified in draft-xxx- mipshop-mstp-solution-00: –S1: Home Network MoS, the MN and the services are located in the home network. –S2: Visited Network MoS, MN is in the visited network and mobility services are also provided by the visited network. –S3: Roaming MoS, MN is in the visited network and all services are provided by the home network. –S4: Third party MoS, MN is in home or visited network and services are provided by a 3rd party network.

Network Topology MN AP (co-located PoS) PoS (not co-located) CN Variable link delay and packet loss Background traffic to CN for congestion MIH message exchange to PoS

Simulation parameters IEEE Data rate (Mb/s)11Mb/s Coverage area – radius (m)50 Links Speed (Mb/s)100 Delay (s)0.01 UDP Max packet size (byte)1000 Header size (bytes)8 TCP Maximum segment size (bytes)1280 Min RTO (s)0.2 Max retransmissionUnlimited Queue sizeUnlimited Header size (bytes)20 IP header IPv6 header (bytes)40 MIH Function Transaction timeout (s)none Maximum number of retransmission 2 Background traffic Traffic typecbr over udp Packet size (bytes)500 Inter-arrival rate (s)0.005 Simulation variables Transport protocolUDP no ACK, UDP ACK, TCP PoS LocationCo-located, Remote Variable link Delay (s) Variable network packet loss (%)0-50 MIH messageIndication, Request/Response MIH packet size (byte) MIH packet inter-arrival (s)Exp distribution w/ varying mean in [ 0.1 2] MIH request processing time (s)0-0.2 MIH message timeout (xRTT) (s)0.5-2 Number of background traffic nodes0-10 Rate limiting bucket size (packet)1-20 Rate limiting token rate (packet/s)1-20 Rate limiting queue size (packet)10-50

Transport protocol performance evaluation Performance metrics: –Transaction success rate (i.e. indication or response received) –Delay to complete a transaction –Network load –Overhead created by the MIH acknowledgement mechanisms and the transport layer –Transport throughput

UDP (no ACK) Performance

UDP (with ACK) Performance

TCP Performance