Pub Date : 1991-12-02DOI: 10.1109/GLOCOM.1991.188382
A. H. Jackson, W. S. Guion, R. Chang
The authors provide an overview of the evolution of the space network from the tracking and data relay satellite system (TDRSS) structure of today to the advanced TDRSS (ATDRSS) structure of the early 21st century. The TDRSS, with its White Sands Ground Terminal (WSGT), is an integral part of the overall NASA space network that will continue to evolve in the 1990s. Central ingredients of this evolution are the construction of the second TDRSS ground terminal, an upgraded WSGT, and an ATDRSS follow-on to the current TDRSS that must be in operation by the late 1990s. Multiple ATDRSS architectural candidates have been identified, and a series of technical tradeoff assessments have been conducted. As a result of these assessments, key ingredients of a future ATDRSS baseline architecture have been defined and initial concepts for transition to an ATDRSS-oriented space network have been developed.<>
{"title":"ATDRSS program overview","authors":"A. H. Jackson, W. S. Guion, R. Chang","doi":"10.1109/GLOCOM.1991.188382","DOIUrl":"https://doi.org/10.1109/GLOCOM.1991.188382","url":null,"abstract":"The authors provide an overview of the evolution of the space network from the tracking and data relay satellite system (TDRSS) structure of today to the advanced TDRSS (ATDRSS) structure of the early 21st century. The TDRSS, with its White Sands Ground Terminal (WSGT), is an integral part of the overall NASA space network that will continue to evolve in the 1990s. Central ingredients of this evolution are the construction of the second TDRSS ground terminal, an upgraded WSGT, and an ATDRSS follow-on to the current TDRSS that must be in operation by the late 1990s. Multiple ATDRSS architectural candidates have been identified, and a series of technical tradeoff assessments have been conducted. As a result of these assessments, key ingredients of a future ATDRSS baseline architecture have been defined and initial concepts for transition to an ATDRSS-oriented space network have been developed.<<ETX>>","PeriodicalId":343080,"journal":{"name":"IEEE Global Telecommunications Conference GLOBECOM '91: Countdown to the New Millennium. Conference Record","volume":"49 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1991-12-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129755313","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1991-12-02DOI: 10.1109/GLOCOM.1991.188496
Zhu Tao, S. Cheng
The application of artificial intelligence (AI) in communication simulation is discussed. The aim considered is to add an expert system into a traditional simulation model and put various kinds of block models in the knowledge base. The author discusses the use of PROLOG as a simulation language as well as automatic programming for AI applications.<>
{"title":"Communication simulation aided with AI","authors":"Zhu Tao, S. Cheng","doi":"10.1109/GLOCOM.1991.188496","DOIUrl":"https://doi.org/10.1109/GLOCOM.1991.188496","url":null,"abstract":"The application of artificial intelligence (AI) in communication simulation is discussed. The aim considered is to add an expert system into a traditional simulation model and put various kinds of block models in the knowledge base. The author discusses the use of PROLOG as a simulation language as well as automatic programming for AI applications.<<ETX>>","PeriodicalId":343080,"journal":{"name":"IEEE Global Telecommunications Conference GLOBECOM '91: Countdown to the New Millennium. Conference Record","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1991-12-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129740109","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1991-12-02DOI: 10.1109/GLOCOM.1991.188540
M. Gans, T. Chu, P. Wolniansky, M. Carloni
The factors which affect the choice of the LuckyNet radio link design, involving data rates on the order of 2.5 Gb/s, are discussed. The specific design of the 2.5-Gb/s radio link for the 23-mile path between the Murray Hill and Crawford Hill locations of AT&T Bell Laboratories is described, along with preliminary performance results. The propagation factors which have the dominant effect on link availability are fading due to rain, water vapor, and multipath. Less than 10/sup -11/ bit error rate (BER) is achieved with an estimated availability of about 95%/yr. The link provides 2.5 b/s/Hz of bandwidth by using dual polarization and QPSK modulation.<>
{"title":"A 2.5 gigabit 23-mile radio link for LuckyNet","authors":"M. Gans, T. Chu, P. Wolniansky, M. Carloni","doi":"10.1109/GLOCOM.1991.188540","DOIUrl":"https://doi.org/10.1109/GLOCOM.1991.188540","url":null,"abstract":"The factors which affect the choice of the LuckyNet radio link design, involving data rates on the order of 2.5 Gb/s, are discussed. The specific design of the 2.5-Gb/s radio link for the 23-mile path between the Murray Hill and Crawford Hill locations of AT&T Bell Laboratories is described, along with preliminary performance results. The propagation factors which have the dominant effect on link availability are fading due to rain, water vapor, and multipath. Less than 10/sup -11/ bit error rate (BER) is achieved with an estimated availability of about 95%/yr. The link provides 2.5 b/s/Hz of bandwidth by using dual polarization and QPSK modulation.<<ETX>>","PeriodicalId":343080,"journal":{"name":"IEEE Global Telecommunications Conference GLOBECOM '91: Countdown to the New Millennium. Conference Record","volume":"99 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1991-12-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127064005","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1991-12-02DOI: 10.1109/GLOCOM.1991.188598
C.-W. Chao, P. Dollard, J.E. Weythman, L. Nguyen, H. Eslambolchi
FASTAR is a robust, reliable, fast-response system for automated network restoration. FASTAR is expected to reduce by orders of magnitude the average service outage time that customers experience as a result of transmission failures. The FASTAR architecture combines centralized and distributed intelligence to provide full automation of the three major categories of restoration operations, alarm gathering and reporting, path implementation, and path assurance. The architecture itself and some of the reasons why it was chosen for the AT&T network are described.<>
{"title":"FASTAR-a robust system for fast DS3 restoration","authors":"C.-W. Chao, P. Dollard, J.E. Weythman, L. Nguyen, H. Eslambolchi","doi":"10.1109/GLOCOM.1991.188598","DOIUrl":"https://doi.org/10.1109/GLOCOM.1991.188598","url":null,"abstract":"FASTAR is a robust, reliable, fast-response system for automated network restoration. FASTAR is expected to reduce by orders of magnitude the average service outage time that customers experience as a result of transmission failures. The FASTAR architecture combines centralized and distributed intelligence to provide full automation of the three major categories of restoration operations, alarm gathering and reporting, path implementation, and path assurance. The architecture itself and some of the reasons why it was chosen for the AT&T network are described.<<ETX>>","PeriodicalId":343080,"journal":{"name":"IEEE Global Telecommunications Conference GLOBECOM '91: Countdown to the New Millennium. Conference Record","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1991-12-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129103529","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1991-12-02DOI: 10.1109/GLOCOM.1991.188426
A. Bondi
The author investigates the extent to which cell losses tend to be bunched by developing a Markov model of cell losses at an output buffer in an ATM (asynchronous transfer mode) switch. The output buffer may be fed by any one of several input lines. It is completely shared among all virtual circuits passing through it. Under congestion, it is shown that successive cell losses are quite likely once an initial cell loss has occurred and that the proportion of lost cells within a frame can be quite large. The bunching of cell losses and the high proportion of cell losses within a frame suggest that a frame-based retransmission scheme is an appropriate recovery mechanism in ATM-based networks such as broadband ISDN (integrated services digital network).<>
{"title":"On the bunching of cell losses in ATM-based networks","authors":"A. Bondi","doi":"10.1109/GLOCOM.1991.188426","DOIUrl":"https://doi.org/10.1109/GLOCOM.1991.188426","url":null,"abstract":"The author investigates the extent to which cell losses tend to be bunched by developing a Markov model of cell losses at an output buffer in an ATM (asynchronous transfer mode) switch. The output buffer may be fed by any one of several input lines. It is completely shared among all virtual circuits passing through it. Under congestion, it is shown that successive cell losses are quite likely once an initial cell loss has occurred and that the proportion of lost cells within a frame can be quite large. The bunching of cell losses and the high proportion of cell losses within a frame suggest that a frame-based retransmission scheme is an appropriate recovery mechanism in ATM-based networks such as broadband ISDN (integrated services digital network).<<ETX>>","PeriodicalId":343080,"journal":{"name":"IEEE Global Telecommunications Conference GLOBECOM '91: Countdown to the New Millennium. Conference Record","volume":"51 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1991-12-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125663721","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1991-12-02DOI: 10.1109/GLOCOM.1991.188551
R. Ziegler, J. Cioffi
In packet-based communication systems using dispersive channels, training symbols are usually provided to estimate the channel response. It is demonstrated that for both simple constant and adaptive least-squares estimates, the average performance of the estimator can be computed with explicit reference to channel time variations. With these analytical results, quantitative evidence can be provided for the classification of channel time variations as fast or slow. They also can be used to evaluate important system design decisions, such as total packet size, training overhead, and data rate, for particular channel conditions.<>
{"title":"Estimation of time-varying digital mobile radio channels","authors":"R. Ziegler, J. Cioffi","doi":"10.1109/GLOCOM.1991.188551","DOIUrl":"https://doi.org/10.1109/GLOCOM.1991.188551","url":null,"abstract":"In packet-based communication systems using dispersive channels, training symbols are usually provided to estimate the channel response. It is demonstrated that for both simple constant and adaptive least-squares estimates, the average performance of the estimator can be computed with explicit reference to channel time variations. With these analytical results, quantitative evidence can be provided for the classification of channel time variations as fast or slow. They also can be used to evaluate important system design decisions, such as total packet size, training overhead, and data rate, for particular channel conditions.<<ETX>>","PeriodicalId":343080,"journal":{"name":"IEEE Global Telecommunications Conference GLOBECOM '91: Countdown to the New Millennium. Conference Record","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1991-12-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125372881","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1991-12-02DOI: 10.1109/GLOCOM.1991.188350
H.K. Torbey, Z. Zhang
A statistical source model for a still image coder is presented and used to derive two queuing models for still image transmission over broadband networks. The first model is based on queuing the image data cells and is analyzed using an M(/sup x/)/D/1 queuing system. The second model is based on queueing the requests for images and is analyzed as an M/G/1 queuing system. The queuing delay is very short for both models. However, the results from the M(/sup x/)/D/1 model (queuing the image data) indicate that very large buffer sizes are required. The M/G/1 model is suitable for analyzing the behavior of an entry node to a network.<>
{"title":"Models for still image transmission over broadband networks","authors":"H.K. Torbey, Z. Zhang","doi":"10.1109/GLOCOM.1991.188350","DOIUrl":"https://doi.org/10.1109/GLOCOM.1991.188350","url":null,"abstract":"A statistical source model for a still image coder is presented and used to derive two queuing models for still image transmission over broadband networks. The first model is based on queuing the image data cells and is analyzed using an M(/sup x/)/D/1 queuing system. The second model is based on queueing the requests for images and is analyzed as an M/G/1 queuing system. The queuing delay is very short for both models. However, the results from the M(/sup x/)/D/1 model (queuing the image data) indicate that very large buffer sizes are required. The M/G/1 model is suitable for analyzing the behavior of an entry node to a network.<<ETX>>","PeriodicalId":343080,"journal":{"name":"IEEE Global Telecommunications Conference GLOBECOM '91: Countdown to the New Millennium. Conference Record","volume":"93 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1991-12-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126218919","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1991-12-02DOI: 10.1109/GLOCOM.1991.188450
J. L. Spencer
It is noted that deployment of fiber in the loop (FITL) involves more than the simple replacement of copper media with optical fiber; it requires the introduction of additional equipment, primarily related to the optoelectronics obviously necessary for fiber optic transport, and a careful reexamination of maintenance strategies. Although the end-to-end service availability objective (99.99%) is not changed in proposed Bellcore criteria, FITL leads to a new hypothetical reference circuit (HRC) and subsequent reallocation of maximum downtimes assigned to different network elements. These changes are reviewed, and some critical system and component issues are identified. The downtime allocations described, based on the new FITL HRC, give equipment suppliers clear reliability goals for the design and manufacture of their products.<>
{"title":"Availability objectives for fiber in the loop systems","authors":"J. L. Spencer","doi":"10.1109/GLOCOM.1991.188450","DOIUrl":"https://doi.org/10.1109/GLOCOM.1991.188450","url":null,"abstract":"It is noted that deployment of fiber in the loop (FITL) involves more than the simple replacement of copper media with optical fiber; it requires the introduction of additional equipment, primarily related to the optoelectronics obviously necessary for fiber optic transport, and a careful reexamination of maintenance strategies. Although the end-to-end service availability objective (99.99%) is not changed in proposed Bellcore criteria, FITL leads to a new hypothetical reference circuit (HRC) and subsequent reallocation of maximum downtimes assigned to different network elements. These changes are reviewed, and some critical system and component issues are identified. The downtime allocations described, based on the new FITL HRC, give equipment suppliers clear reliability goals for the design and manufacture of their products.<<ETX>>","PeriodicalId":343080,"journal":{"name":"IEEE Global Telecommunications Conference GLOBECOM '91: Countdown to the New Millennium. Conference Record","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1991-12-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126481810","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1991-12-02DOI: 10.1109/GLOCOM.1991.188548
W. Williams, L. O. Barbosa, N. Georganas
The DQDB (distributed queue dual bus) architecture has been adopted as the IEEE 802.6 Metropolitan Area Network standard. It is shown that the standard in its present form is still inadequate in dividing its available bandwidth between stations while supporting multiple communities of interest. In fact, the bandwidth balancing mechanism (BWB) introduced to overcome the unfairness of DQDB may actually worsen the fairness of the protocol. A modified version of the BWB mechanism called variable bandwidth balancing (V-BWB) which overcomes the inadequacies of DQDB during periods of heavy utilization is introduced.<>
{"title":"System unfairness of DQDB in supporting multiple communities of interest","authors":"W. Williams, L. O. Barbosa, N. Georganas","doi":"10.1109/GLOCOM.1991.188548","DOIUrl":"https://doi.org/10.1109/GLOCOM.1991.188548","url":null,"abstract":"The DQDB (distributed queue dual bus) architecture has been adopted as the IEEE 802.6 Metropolitan Area Network standard. It is shown that the standard in its present form is still inadequate in dividing its available bandwidth between stations while supporting multiple communities of interest. In fact, the bandwidth balancing mechanism (BWB) introduced to overcome the unfairness of DQDB may actually worsen the fairness of the protocol. A modified version of the BWB mechanism called variable bandwidth balancing (V-BWB) which overcomes the inadequacies of DQDB during periods of heavy utilization is introduced.<<ETX>>","PeriodicalId":343080,"journal":{"name":"IEEE Global Telecommunications Conference GLOBECOM '91: Countdown to the New Millennium. Conference Record","volume":"64 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1991-12-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125803849","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1991-12-02DOI: 10.1109/GLOCOM.1991.188661
J.M. Anderson, G. Parulkar, Z. Dittia
The authors examine persistent connections as a part of the very high speed internet (VHSI) abstraction proposed by G.M. Parulkar (see ACM SIGCOMM Computer Communications Review, p.18, 1990). An important component of the VHSI is a novel multipoint congram-oriented high-performance internet protocol (Mchip). The congram is the basic service primitive of Mchip which incorporates strengths of both connection and datagram approaches. Mchip supports two types of congrams: the user congram (UCon) and the persistent internet congram (PICon). The authors evaluate the need for PICons, and their place in the VHSI model. They focus on the PICon control packet organization and present examples of PICon setup and use. Future research directions are identified.<>
{"title":"Persistent connections in high speed internets","authors":"J.M. Anderson, G. Parulkar, Z. Dittia","doi":"10.1109/GLOCOM.1991.188661","DOIUrl":"https://doi.org/10.1109/GLOCOM.1991.188661","url":null,"abstract":"The authors examine persistent connections as a part of the very high speed internet (VHSI) abstraction proposed by G.M. Parulkar (see ACM SIGCOMM Computer Communications Review, p.18, 1990). An important component of the VHSI is a novel multipoint congram-oriented high-performance internet protocol (Mchip). The congram is the basic service primitive of Mchip which incorporates strengths of both connection and datagram approaches. Mchip supports two types of congrams: the user congram (UCon) and the persistent internet congram (PICon). The authors evaluate the need for PICons, and their place in the VHSI model. They focus on the PICon control packet organization and present examples of PICon setup and use. Future research directions are identified.<<ETX>>","PeriodicalId":343080,"journal":{"name":"IEEE Global Telecommunications Conference GLOBECOM '91: Countdown to the New Millennium. Conference Record","volume":"45 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1991-12-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126070857","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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