G. T. Nguyen, R. H. Katz, B. Noble, and M. Satyanarayanan. A trace-based approach for modelling wireless channel behavior. In Proceedings of the Winter Simulation Conference, 1996.  Home/Search   Document Not in Database   Summary   Related Articles   Check

....distillation (and the use of proxies) to provide both application aware and application transparent adaptation at the file system level. Much of the rest of the BARWAN architecture is complementary, such as overlay networking and reliable data transport, and in fact there has been some joint work [43]. One major distinction is the service focus of BARWAN, rather than the file system focus of Odyssey, which enables not only localized services, but also complex TACC based services (and protocols) such as the Wingman browser. The InfoPad project [18, 44] preceded BARWAN, had some overlap in ....

G. T. Nguyen et al., "A Trace-Based Approach for Modelling Wireless Channel Behavior," Proc. Winter Simulation Conf., Dec. 1996.

....and multiple interference of radio channels. Because our system runs at application level, we have done our experiments with packet error rates (PER) rather than bit error rates (BER) The usage of packet error probabilities has been motivated by the analysis of real traffic traces described in [NgK96]. The error inducer calculates the error occurrence independent of the packet size. This assumption is reasonable because we have observed that most of the transmitted video packets nearly fill a whole maximum transfer unit (MTU) With an MTU of 1000 bytes, the average packet size is usually ....

Giao T. Nguyen, R. H. Katz, et al.; "A trace-Based Approach For Modelling Wireless Channel Behaviour"; Winter Simulation Conference, Coronado, CA December 1996.

....can be radically different; e.g. a satellite link and a wireless LAN may experience very different types of errors. Since solving the problem of high error rates depends critically on understanding the types and frequencies of errors, many studies have characterized wireless environments, e.g. [26,18,20,10,11] for wireless LANs. A recent study on the error characteristics of a wireless, in building LAN [11] showed that wireless error environments may vary greatly depending on the placement of communicating stations, operation of other radio appliances, and even location of human operators. Variation in ....

....problem is traditionally addressed by using trace based evaluation. A set of traces is collected that capture features of the environment that are important to the protocols under investigation. The different protocols are then implemented and evaluated in a simulator or an emulated environment [18,20] that is driven by the traces. By using the same set of traces for each of protocols, a direct comparison is possible. We use this approach for our evaluation of adaptive error control policies. We use a simulator (discussed below) that is driven by the detailed error traces that we presented in ....

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Nguyen, G. T., Katz, R. H., Noble, B., and Satyanarayanan, M. A Trace-Based Approach for Modelling Wireless Channel Behavior. in: Proceedings of the Winter Simulation Conference. 1996.

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G. T. Nguyen, R. H. Katz, B. Noble, and M. Satyanarayanan. A trace-based approach for modelling wireless channel behavior. In Proceedings of the Winter Simulation Conference, 1996.

....wireless errors and scheduling around the error bursts. Due to the difficulty of detecting wireless errors on a short time scale, our approach differs somewhat by using link quality estimates that are averaged over a longer period of time. Our earlier work on measuring and modeling wireless errors [NKNS96] revealed that estimates over a few seconds are adequate for bandwidth management. The remaining issue is where to monitor the wireless channel. Ideally, the receiver should detect wireless errors and inform the sender. The overhead of relaying the channel information to the sender can be reduced ....

....distillation (and the use of proxies) to provide both application aware and application transparent adaptation at the file system level. Much of the rest of the BARWAN architecture is complementary, such as overlay networking and reliable data transport, and in fact there has been some joint work [NKNS96]. One major distinction is the service focus of BARWAN, rather than the file system focus of Odyssey, which enables not only localized services, but also complex TACC based services (and protocols) such as the Wingman browser. The InfoPad project [Bre 96] N 96] preceded BARWAN, had some overlap ....

G . T. Nguyen, R. H. Katz, B. Noble, and M. Satyanarayanan. A Trace-Based Approach for Modelling Wireless Channel Behavior. Proc. of the Winter Simulation Conference, December 1996.

....distillation (and the use of proxies) to provide both application aware and application transparent adaptation at the file system level. Much of the rest of the BARWAN architecture is complementary, such as overlay networking and reliable data transport, and in fact there has been some joint work [NKNS96]. One major distinction is the service focus of BARWAN, rather than the file system focus of Odyssey, which enables not only localized services, but also complex TACC based services (and protocols) such as the Wingman browser. The InfoPad project [Bre 96] N 96] preceded BARWAN, had some overlap ....

G. T. Nguyen, R. H. Katz, B. Noble, and M. Satyanarayanan. A Trace-Based Approach for Modelling Wireless Channel Behavior. Proc. of the Winter Simulation Conference, December 1996.

....such as rain or low temperatures, further constrain live outdoor experiments. 2. Problem statement 3. Solution: trace modulation The network quality experienced by a mobile host can vary dramatically and unpredictably over space and The essence of our solution is to provide applicationtime [6, 12]. This imposes fundamental constraints on the transparent emulation of a target network on a LAN by logistics of system development, and on the degree of modifying the network layer of an operating system. The experimental control for evaluation. On the one hand, the modified layer drops or delays ....

Nguyen, G.T., Katz, R.H., Noble, B., Satyanarayanan, M. A Trace-Based Approach for Modelling Wireless Channel Behavior. In Proceedings of the Winter Simulation Conference. 1996.

....is valuable in debugging mobile systems because it enables the re creation of conditions that trigger rare but serious bugs. Unfortunately, obtaining repeatable performance is extremely difficult because the quality of wireless networks can vary dramatically and unpredictably over time and space [6, 12]. In this paper we describe a solution, called trace modulation, which combines three distinct ideas. First, performance of a real, wireless network is captured through trace collection. Second, these complex network observations are reduced to a list of parameters of a simple, time varying ....

....mechanism differs from the Berkeley Packet Filter in that we record device characteristics in addition to information from packets. While not strictly necessary for trace modulation, such a record of device behavior in actual use is valuable for a better understanding of wireless networks [12]. The notion of reducing complex network observations to simple parameters through controlled workloads is commonly used in modelling physical channels. Our determination of bottleneck bandwidth is quite similar to the packetpair approach used by Keshav [10] but our workload enables derivation of ....

Nguyen, G., Katz, R., Noble, B., and Satyanarayanan, M. A Trace-Based Approach for Modelling Wireless Channel Behavior. In Proceedings of the Winter Simulation Conference (1996).

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Giao T. Nguyen, Randy H. Katz, Brain Noble, Mahadev Satyanarayanan. A trace-based approach for modelling wireless channel behavior, ACM Press, Series-Proceeding-Article, 597-604.

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