Y. Chawathe, S. Fink, S. McCanne, and E. Brewer, "A Proxy Architecture for Reliable Multicast in Heterogeneous Environments, " in Proceedings of ACM Multimedia, Bristol, England, September 1998.  Home/Search   Document Details and Download   Summary   Related Articles   Check

....area of the Pavilion project is on supporting collaborative applications in which some of the participants are connected via wireless local area networks (WLANs) Typical settings include schools, offices, factories, and hospitals. Many approaches to accommodating mobile users involve proxies [3, 4], which represent wireless nodes to the rest of the wired network. Figure 1 depicts the physical configuration of a Pavilion proxy that supports three mobile hosts on a wireless LAN. In earlier papers, we have described the use of Pavilion proxies to support collaboration via wireless handheld ....

....with the forward packet stream. 17 Figure 14. EPRs suppressed. 7 Related Work The subject of packet based delivery of video streams over wireless networks is receiving increasing attention [9, 18] In addition, using proxy servers to support MHs is well accepted in the mobile computing arena [3, 4, 19, 20]. Our initial investigations extend two previous contributions, one from each of these areas. First, Nahrstedt et al. 9] recently proposed QoS Directed Error Control (QDEC) for video multicast in wireless networks. The authors argued that compressed video formats, such as MPEG, usually involve ....

Y. Chawathe, S. Fink, S. McCanne, and E. Brewer, "A proxy architecture for reliable multicast in heterogeneous environments," in Proceedings of ACM Multimedia '98, (Bristol, UK), September 1998.

....a rate matching the high speed clients, the low end clients would be congested, or, on the other way, if the sender keeps pace with the most constrained receiver, the high end clients would complain about the poor quality. The problem of heterogeneity has been addressed in many previous works [5] [6] [7] All of these works can be categorized into two classes: end to end solution and proxy based solution. The former approach is usually based on layered media. The sender encodes the media into multiple layers, and the receivers can tune their receiving sets according to their own capability. ....

....IBM transcoding service [12] 14] to provide proper information according to clients capability. Similar services are also built by Intel [17] and Spyglass [18] A. Fox [13] builds a proxy that distillates the images in real time. In multicast, 5] is a proxy dealing with video audio and [6] is a proxy that transfers data from multicast group to mobile devices. RMTP [2] is a tree based reliable multicast protocol that organized members into a hierarchical tree structure. Each branch in the tree has a designated receiver (DR) to receive ACKs from its children and aggregate them ....

Yatin Chawathe, Steve A. Fink, Steven McCanne, and Eric A. Brewer, "A Proxy Architecture for Reliable Multicast in Heterogeneous Environments", in Proceedings of ACM Multimedia, 1998

....groups. Clients need to (de)multiplex and join or leave groups based on monitored loss characteristics and possibly perform content format conversion for other members in the group. To guarantee scalable reliable data transfer to large groups, some form of reliable multicast can be deployed [3, 8]. Clients need to multicast retransmission requests and participate in a random backo based protocol to avoid synchronizing retransmission requests. 1 To provide uninterrupted service to mobile hosts traveling between zones served by di erent radio transmitters, a hand o protocol can be ....

....in. This can include protocols to partition feedback bandwidth based on monitored trac and loss characteristics (e.g. RTCP [26] selecting a member of a replicated server group [2, 7, 10, 20] hand o noti cation for mobile clients, sending retransmission requests for scalable reliable multicast [3, 8], dynamically varying the set of multicast groups listened to based on monitored loss characteristics [17] participating in a content transcoding protocol for other members in the group [14] etc. These interactions are often asynchronous in that the application needs to rapidly recognize a ....

Y. Chawathe, S. Fink, S. McCanne, and E. Brewer. A proxy architecture for reliable multicast in heterogeneous environments. In Proc. of ACM Multimedia, 1998.

....dynamic service adaptability. The largest part of the proposals comes from the active network area: several research activities address the possibility to reserve resources on the path between the service provider and its clients, and to dynamically inject application specific multicast protocols [11]; others propose intermediate hosts that play the role of active filters to dynamically adapt the exchanged information to the currently available bandwidth, especially in the multimedia distribution application domain [1, 2] However, there is not a general agreement on the fact that the ....

Chawathe, Y., Fink, S., McCanne, S., and Brewer, E. A Proxy Architecture for Reliable Multicast in Heterogeneous Environments. Proc. ACM Multimedia'98, Sep. 1998.

....is a CORBA based platform aimed at improving the QoS level by inserting proxy objects in the path of the transmitted data. However, The system is tailored mainly to improve the quality of service, as opposed to the more general adaptability of the APrx system. The Reliable Multicast proXy (RMX) [3] is another system designed with the goal of adaptability in mind. The RMX system proposes a heavyweight multicast proxy placed on a separate host between a server and its clients. The proxy has a complete knowledge of the state of those clients (e.g. their respective bandwidths) will modify any ....

Y. Chawathe, S. McCanne, S. Fink, and E. A. Brewer, "A Proxy Architecture for Reliable Multicast in Heterogeneous Environments", in Proceedings of ACM Multimedia'98, Bristol, U.K., September 1998.

....than cellular services. Extending collaborative applications to wireless hosts calls for redesign of communication services in order to accommodate the relatively high loss rates and generally lower bit rates of such environments. Many approaches to solving this problem involve the use of proxies [2,3], which represent wireless receivers to the rest of the wired network. In this paper, we describe an experimental study in the use of proxy services to support collaboration across heterogeneous LANs. Specifically, we address the issue of reliably multicasting web resources to users in such ....

Y. Chawathe, S. Fink, S. McCanne, and E. Brewer. A proxy architecture for reliable multicast in heterogeneous environments. In Proceedings of ACM Multimedia '98, Bristol, UK, September 1998.

....source (where I B LFHG ) Then it is easy to check that M # A more realistic model will have some distribution of delays and buffer sizes. These limitations could be better addressed by simulations. VII. RELATED WORK Chawathe et al. [6] describe a proxy architecture for reliable multicast in heterogeneous environments. Their approach is lossy application specific compression at proxies which feed the low bandwidth clients at reduced rates. For reliable distribution of text data, their approach is not very suitable. On the other ....

Y. Chawathe, S. Fink, S. McCanne, and E. Brewer. A proxy architecture for reliable multicast in heterogeneous environments. In Proceedings of the ACM Multimedia Conference, 1998.

....some simulations. We plan to do simulations with ns 2 [2] VII. RELATED WORK Note: We deliberately discuss more related work than really necessary because the literature for multicast is becoming so vast that it is difficult to keep track of the developments in this area. Chawathe et al. [10] describe a proxy architecture for reliable multicast in heterogeneous environments. Their approach is lossy application specific compression at proxies which feed the low bandwidth clients at reduced rates. Such an approach is unavoidable in an interactive environment such as whiteboards because ....

Y. Chawathe, S. Fink, S. McCanne, and E. Brewer. A proxy architecture for reliable multicast in heterogeneous environments. In Proceedings of the ACM Multimedia Conference, 1998.

....protocol that also encapsulates security and encryption was crafted for Wingman. Wingman s proxy side adapter translates between this protocol and HTTP, giving Wingman the ability to access existing Web servers. When Wingman was evolved into a PalmPilot implementation of the shared whiteboard [CFMB98], the network adapter was augmented to tunnel multicast to the PalmPilot 8 over a unicast TCP connection, to compensate for the PalmPilot s inability to handle multicast directly; this is another example of network adaptation. 3.2 CMU Odyssey Odyssey is a system built at Carnegie Mellon ....

Yatin Chawathe, Steve Fink, Steven McCanne, and Eric A. Brewer. A proxy architecture for reliable multicast in heterogeneous environments. Proc. IFIP Middleware 98, Lake District, UK, Sept. 1998. 28

.... Packets are classified and marked with a small bit pattern to receive a particular per hop forwarding behavior on nodes along their path [5] A well known way to place enhanced functionality within the network is the establishment of transport level [6] or application level gateways [7] [8]. Common to those solutions is the withdrawal of transparent end to end network operation. The intermediate system which hosts the additional functionality is the peer entity of both sending and receiving system. An evident advantage of gateway techniques is its flexible utilization without ....

Y. Chawathe, S. A. Fink, S. McCanne, and E. A. Brewer, "A Proxy Architecture for Reliable Multicast in Heterogeneous Environments," unpublished.

....multicast communication session can be signalled. However, current flow specifications limit heterogeneity support to network performance parameters. A well known way to place enhanced functionality within the network is the establishment of transport level [4] or application level gateways [5] [6]. Common to those solutions is the withdrawal of transparent end to end network operation. The gateway system which hosts the additional functionality is the peer entity of both sending and receiving system. Active Networking. Active Networking is a novel approach to provide application specific ....

Y. Chawathe, S. A. Fink, S. McCanne, and E. A. Brewer, "A Proxy Architecture for Reliable Multicast in Heterogeneous Environments," unpublished.

....Heterogeneous demands on service quality and media format as well as dissimilar network conditions may lead to situations, where different group members would like to experience a different group service. Currently diverse approaches exist to signal and provide those heterogeneous group services [1, 2, 4]. However, the provided service is typically penetrated by the member with the lowest service capabilities. This is not acceptable for multimedia and collaborative applications in heterogeneous networking environments. The AMnet approach makes user tailored data streams available to individual ....

Yatin Chawathe, Steve Fink, Steven McCanne, and Eric Brewer. A Proxy Architecture for Reliable Multicast in Heterogeneous Environments. In Proceedings of ACM Multimedia '98, Bristol, U.K., September 1998. ACM.

....supports highbandwidth data transfers such as streaming media. Like Pavilion, MASH can be used to interconnect different components or extend existing components. The MASH project uses the SRM protocol [5] for reliable multicasting, a flexible proxy server for layered transmission and transcoding [3], and a component for HTML distribution called MASHCast. Pavilion project shares many of the goals and design philosophies of the MASH project. However, whereas many of the MASH components are legacy systems written in C C , the Pavilion project investigates how to provide such functionality ....

Chawathe, Y., Fink, S. A., McCanne, S., Brewer, E. A., A Proxy Architecture for Reliable Multicast in Heterogeneous Environments, in Proceedings of ACM Multimedia '98 (Bristol, UK, September 1998).

....for other members in the group. To provide scalable reliable data transfer to a large receiver group, techniques have been proposed that require clients to multicast their retransmission requests and to participate in a random backoff based protocol to avoid synchronizing retransmission requests [4, 8]. To provide uninterrupted service to mobile hosts traveling between zones served by different radio transmitters, a hand off notification is sent to the client which then terminates its current service instance and requests service in the new zone. This increase in the complexity in the ....

.... multicast group(s) carrying transcoded content [13] notification from a customcast service informing the client about changes in the multicast groups it should listen to [1] and quality of service feedback (e.g. RTP based services [24] retransmission requests for scalable reliable multicast [4, 8], etc. We based our design of Service Sockets on this categorization. Our design consists of a core module, a control layer and any number of data layers. The core module is service independent and is provided as a part of the Service Sockets infrastructure. The control layer and the data layers ....

Y. Chawathe, S. Fink, S. McCanne, and E. Brewer. A proxy architecture for reliable multicast in heterogeneous environments. In Proc. of ACM Multimedia'98, 1998.

No context found.

Y. Chawathe, S. Fink, S. McCanne, and E. Brewer, "A Proxy Architecture for Reliable Multicast in Heterogeneous Environments, " in Proceedings of ACM Multimedia, Bristol, England, September 1998.

No context found.

CHAWATHE, Y., FINK, S., MCCANNE, S., AND BREWER, E. A Proxy Architecture for Reliable Multicast in Heterogeneous Environments. In Proceedings of ACM Multimedia '98 (Sept. 1998).

....Scalable Reliable Multicast (SRM) 17] which was speci cally designed to accomodate application semantics in its transport protocol. We build upon libsrm [42] an implementation of SRM developed at Berkeley. Our preliminary exploration into the rich space of the RMX infrastructure is described in [12]. In that paper, we discuss some initial work on the RMX abstract model and present a prototype implementation of an RMX for enabling reliable multicast sessions such as shared electronic whiteboards for impoverished devices like the PalmPilot PDA. The rest of this proposal is organized as ....

Chawathe, Y., Fink, S., McCanne, S., and Brewer, E. A Proxy Architecture for Reliable Multicast in Heterogeneous Environments. In Proceedings of ACM Multimedia '98 (Bristol, U.K., Sept. 1998).

....is a hard problem that has not been satisfactorily solved. Much research advocates the strategic placement of intelligence within the network infrastructure, given the limitation of the end to end scheme [5] based on the current multicast service model. For example, RMTP [11] LRMP [8] and RMX [4] deploy service nodes within and across the network to carry out localized retransmission and to accommodate network heterogeneity. Other works address the problem of how one might jointly optimize the design of a new multicast service with complementary end to end transport protocols, thereby ....

Y. Chawathe, S. Fink, S. McCanne, and E. Brewer. A Proxy Architecture for Reliable Multicast in Heterogeneous Environments. In Proceedings of ACM Multimedia, Bristol, England, September 1998.

.... designated receivers be placed within the network infrastructure to carry out localized retransmissions using subtree multicasts to enhance scalability [18] LRMP proposes the deployment of logging receivers that provide a similar function [12] and the Reliable Multicast proXy (RMX) architecture [6] relies on proxy agents within the network to carry out format and protocol conversion to accommodate network heterogeneity and effect congestion control. Rather than rely on service node deployment within and across the network, other works address the problem of how one might jointly optimize ....

Y. Chawathe, S. Fink, S. McCanne, and E. Brewer. A Proxy Architecture for Reliable Multicast in Heterogeneous Environments. In Proceedings of ACM Multimedia, Bristol, England, September 1998.

....says that application performance can be substantially enhanced by reflecting the application s semantics into the design of its network protocol. This approach to protocol design is a boon to protocol performance since the application is optimized for the network and vice versa. In previous work [14], we presented a stub extension solution where RMXs provided access to reliable multicast sessions for clients that were either impoverished (hand held PDAs, etc. or handicapped due to poor network connectivity. The RMX acted as a stub for the client and participated in a global multicast ....

....In this paper, we generalize this approach to a widearea distributed framework for tackling wide area heterogeneity through a collection of RMXs arranged as an applicationlevel overlay network. Our design has been strongly influenced by our experiences implementing the prototype RMX described in [14]. We have implemented the wide area framework as application customizable RMXs and built custom modules to support real applications. In the remainder of this paper, we develop this overlay network architecture. Section II presents an overview of the RMX architecture. Section III presents details ....

[Article contains additional citation context not shown here]

Yatin Chawathe, Steve Fink, Steven McCanne, and Eric Brewer, "A Proxy Architecture for Reliable Multicast in Heterogeneous Environments, " in Proceedings of ACM Multimedia '98, Bristol, U.K., Sept. 1998.

....manager to restart the worker; once the worker has come up, the client can communicate the lost state back to the worker. In addition to these applications, the SNS architecture has been used for a number of other services. Some of them include a proxy based electronic shared whiteboard for PDAs [14], and Cha Cha, a system for contextualizing web search results to provide more structure by organizing the results according to some semantics such as document location, content, etc. 15] 5 System Evaluation We took measurements of our implementation using the TranSend proxy as the test bed. ....

Chawathe, Y., Fink, S., McCanne, S., and Brewer, E. A Proxy Architecture for Reliable Multicast in Heterogeneous Environments, Feb. 1998. Submitted for publication to ACM Multimedia '98.

....of DRs. A number of emerging research proposals advocate the use of application aware agents or proxies to serve as intermediaries between a source and receivers as a means of coping with the heterogeneity inherent in multicast sessions on account of varied network and end host capabilities. In [4] Chawathe et al. present a general architecture for proxy based reliable multicast called the Reliable Multicast proXy (RMX) model. Their prototype RMX implementation for a shared whiteboard application for hand held PDAs relies on the existence of a well known service cluster that supports the ....

....which has to unicast replies back to every receiver. In order to improve the efficiency of tracing in Tracer, Levine et al. propose the addition of source based multicast tracing to IGMP. Static configuration of receivers as in RMTP [19] the use of service clusters with well known locations [1, 4] for agentbased solutions etc while good first cut solutions may not scale well to large receiver groups with multiple service clusters without the dynamic and optimal configuration of receivers. In [3] the authors explore the use of end to end multicast traffic as measurement probes to infer ....

CHAWATHE, Y., FINK, S., MCCANNE, S., AND BREWER, E. A Proxy Architecture for Reliable Multicast in Heterogeneous Environments. In Proceedings of ACM Multimedia '98 (Sept. 1998).

No context found.

Y. Chawathe, S. Fink, S. McCanne, and E. Brewer, "A Proxy Architecture for Reliable Multicast in Heterogeneous Environments, " Proc. ACM Multimedia '98, Sept. 1998.

No context found.

Chawathe, Y., Fink, S., McCanne, S., Brewer, E.: A proxy architecture for reliable multicast in heterogeneous environments. In: Proceedings of ACM Multimedia '98, Bristol, UK (1998)

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Y. Chawathe, S. Fink, S. McCanne, and E. Brewer. A proxy architecture for reliable multicast in heterogeneous environments. In Proceedings of ACM Multimedia '98, Bristol, UK, September 1998.

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