TY - JOUR
T1 - MeGaDiP
T2 - A wide-area Media Gateway Discovery Protocol
AU - Xu, Dongyan
AU - Nahrstedt, Klara
AU - Wichadakul, Duangdao
N1 - Funding Information:
We would like to thank the anonymous reviewers for their constructive comments which have helped us improve the final version of this paper. Our work was supported by the National Science Foundation under contract number 9870736, the Air Force Grant under contract number F30602-97-2-0121, National Science Foundation Career Grant under contract number NSF CCR 96-23867, NSF PACI grant under contract number NSF PACI 1-1-13006, NSF CISE Infrastructure grant under contract number NSF EIA 99-72884, NSF CISE Infrastructure grant under contract number NSF CDA 96-24396, and NASA grant under contract number NASA NAG 2-1250. However, views and conclusions of this paper are those of the authors and should not be interpreted as representing the official policies, either expressed or implied, of the funding agencies.
PY - 2002/3
Y1 - 2002/3
N2 - In wide-area and heterogeneous environments, it is necessary to deploy media gateways at strategic locations within the networks, in order to deliver customized and compose-able multimedia services to individual users. In many cases, media gateways have to be dynamically discovered, because (1) a host may not know a priori all the media gateways it will possibly use, and (2) the change of host location or end-to-end resource condition can make a known media gateway no longer useful. However, current general service location mechanisms are not sufficient to perform media gateway discovery. In this paper, we present MeGaDiP, a wide-area Media Gateway Discovery Protocol. It is based on the same basic architecture of the general service location mechanisms, and can be seen as a discovery heuristics that will be invoked first when discovering a media gateway. The key properties of MeGaDiP include: (1) awareness of both source and destination end hosts: any discovered media gateway will not create an excessively long path between the end hosts via the gateway; (2) resource-awareness: any discovered media gateway is likely to have sufficient end-to-end resources to perform its service; (3) return of discovery results with low latency and high validity by caching and resource validation; (4) small amount of management traffic, regardless of the number of media gateways and end hosts in the environment. Furthermore, an extension to MeGaDiP using a hierarchical architecture is proposed to improve the discovery success rate. The initial performance results from both our prototype implementation and simulation show the soundness of MeGaDiP.
AB - In wide-area and heterogeneous environments, it is necessary to deploy media gateways at strategic locations within the networks, in order to deliver customized and compose-able multimedia services to individual users. In many cases, media gateways have to be dynamically discovered, because (1) a host may not know a priori all the media gateways it will possibly use, and (2) the change of host location or end-to-end resource condition can make a known media gateway no longer useful. However, current general service location mechanisms are not sufficient to perform media gateway discovery. In this paper, we present MeGaDiP, a wide-area Media Gateway Discovery Protocol. It is based on the same basic architecture of the general service location mechanisms, and can be seen as a discovery heuristics that will be invoked first when discovering a media gateway. The key properties of MeGaDiP include: (1) awareness of both source and destination end hosts: any discovered media gateway will not create an excessively long path between the end hosts via the gateway; (2) resource-awareness: any discovered media gateway is likely to have sufficient end-to-end resources to perform its service; (3) return of discovery results with low latency and high validity by caching and resource validation; (4) small amount of management traffic, regardless of the number of media gateways and end hosts in the environment. Furthermore, an extension to MeGaDiP using a hierarchical architecture is proposed to improve the discovery success rate. The initial performance results from both our prototype implementation and simulation show the soundness of MeGaDiP.
KW - Distributed multimedia
KW - Media gateway
KW - Service discovery
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U2 - 10.1016/S0020-0255(01)00190-6
DO - 10.1016/S0020-0255(01)00190-6
M3 - Article
AN - SCOPUS:0036497636
VL - 141
SP - 37
EP - 59
JO - Information Sciences
JF - Information Sciences
SN - 0020-0255
IS - 1-2
ER -