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Failure recovery procedure  

Failure recovery procedure  

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Fig. 1 Proposed multicast connectivity solution architecture  
Fig. 2 Join process for an agent to find a suitable server  
Fig. 3 Failure recovery procedure  
Fig. 4 Group management for end systems  
+9 Fig. 8 Operations of endpoints receiving probe packet from a slave  
A hybrid multicast connectivity solution for multi-party collaborative environments
Article
Full-text available
  • Aug 2009
In multi-party collaborative environments, a group of users can share multiple media streams via IP multicasting. However, despite of the efficiency of IP multicast, it is not widely available and alternative application-layer multicast approaches are introduced. Application-layer multicast is advantageous, however, it incurs additional processing...
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Contexts in source publication

Context 1
... third attempt, if no acknowledgement is received, it breaks the connection with the server and makes a new connection with another server. Figure 3 shows this failure recovery procedure. ...
Context 2
... AG supports QuickBridge multicast bridging solution. A QuickBridge server is located in a multicast-enabled network and performs data relay between multicast-enabled and multicast-disabled networks. The AG users in multicast- disabled networks can receive the multicast traffic from the QuickBridge server in UDP unicast packets. As depicted in Fig. 13, the venue client requests a unicast bridge address for each multicast address used in running a media tool to the QuickBridge server with shortest RTT (Round Trip Time). Then, the venue client restarts media tools with the bridge ...

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... In order to support variety and rigid collaborative activities, services such as service abstraction, discovery and selection, placement and binding services [11] based on Service Oriented Architecture (SOA) is applied. Most of these services are associated in the middleware of the framework ([12], [13]). However, these useful services have to comply with the well-defined rules in a specific domain problem. ...
A Framework for Sharing Communication Media in Supporting Creative Task in Collaborative Workspace
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In networked collaborative working environment, users are involved with either repeatable or exclusive task. These variety tasks required the collaborative system to support it dynamic and creative solutions especially in sharing the communication media. Most of the related research are objectively focusing on the alignment of user behavior in shared activities. There is not much research conducted concerning on sharing communication media components in creative collaborative activity in details. In this paper, we analyze collaborative work application systems focusing on the communication module in four common areas; business, health, education and manufacturing. Based on the analysis, communication media sharing elements are formed into three layers. In each layer, media sharing element and its functions are identified. Then, we proposed a general software framework for communication media sharing for creative collaborative activities. The framework is functioning as a platform for users to manage their dynamic creative solutions to accomplish complex task.
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Realization of Streaming Media Data Multicast Based on UDP
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With wide usage and special needs of AV transmission services on the Internet, streaming media transport protocol and its technology is studied. In order to effectively resolve and control highly sensitive delay problem on the streaming media services and on carefully comparing TCP and UDP features, an UDP-based streaming media transmission multicast system is designed and implemented. By experiment, a delay time performance in different playout buffer (PB) length and different client numbers are achieved. The results demonstrated the real-time advantage of UDP on streaming media transmission.
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