Changes between Version 8 and Version 9 of FirstGenBrooks


Ignore:
Timestamp:
02/08/12 18:35:17 (7 years ago)
Author:
kccamer@clemson.edu
Comment:

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  • FirstGenBrooks

    v8 v9  
    3131== WiMAX Bandwidth Contention Process and DDoS ==
    3232
    33 Our WiMAX research involves analyzing the cross-layer affects of the system parameters used for the Bandwidth Contention Process. We are specifically looking at how these parameters affect a subscriber station's (SS) throughput, packet loss rates, and vulnerability to Distributed Denial of Service (DDoS) attacks. Software simulations using the NS-2 simulator manipulated three system parameters for a set of SS that included client and attacker SS's. The parameters, request retires, backoff start, and frame duration, were set to a low, medium, and high value within their respective range. All attacker SS's parameters were set to the same value and all client SS's parameters were set to same value, but the attacker and clients stations could differ. Seven replications of each combination of parameter settings were conducted and ANOVA analysis indicates that frame duration and request retries plays a significant role in SS's throughput. For software simulation results please see: [link]
     33Our WiMAX research involves analyzing the cross-layer affects of the system parameters used for the Bandwidth Contention Process. We are specifically looking at how these parameters affect a subscriber station's (SS) throughput, packet loss rates, and vulnerability to Distributed Denial of Service (DDoS) attacks. Software simulations using the NS-2 simulator manipulated three system parameters for a set of SS that included client and attacker SS's. The parameters, request retires, backoff start, and frame duration, were set to a low, medium, and high value within their respective range. All attacker SS's parameters were set to the same value and all client SS's parameters were set to same value, but the attacker and clients stations could differ. Seven replications of each combination of parameter settings were conducted and ANOVA analysis indicates that frame duration and request retries plays a significant role in SS's throughput. For software simulation results please see:[http://www.clemson.edu/~rrb/WiMax/WiMaxDDoSTest.tgz]
    3434
    3535We are now using ORBIT, hosted by Rutgers University's WINLAB and part of the GENI network, to conduct hardware experiments using real WiMAX equipment. We are replicating the above software experiments to verify software simulation results, analyze the validity of the NS-2 WiMAX simulator, and gain further information about the cross layer affects of the system parameters used in the Bandwidth Contention Process. Currently our hardware experiments are configured with eight SS nodes, a sink node, and 1 base station (BS). In the future we hope to extend the number of SS used in our experiments. We are using the resource of sandbox 4 and the outdoor sandbox. The indoor sandbox creates a controlled environment for wireless experiments and outdoor consists of an outdoor BS and nodes that vary in geographical location. Are hardware experiments manipulate two system parameters, backoff start and backoff end. Frame duration is not considered, because all WiMAX equipment currently manufactured supports only 5ms frame duration. Data will be collected for two replications of each combination of parameter settings. When the data collection is complete, analysis will be carried out to determine the affect of system parameters on real WiMAX hardware.