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Global Telecommunications Conference, 1991. GLOBECOM '91. 'Countdown to the New Millennium. Featuring a Mini-Theme on: Personal Communications Services

Date 2-5 Dec. 1991

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  • IEEE Global Telecommunications Conference. GLOBECOM '91. Countdown to the New Millennium. Featuring a Mini-Theme on: Personal Communications Services (PCS). Conference Record (Cat. No.91CH2980-1)

    Publication Year: 1991
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    Freely Available from IEEE
  • Very high speed optical line terminals

    Publication Year: 1991 , Page(s): 750 - 754 vol.2
    Cited by:  Papers (6)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (368 KB)  

    An analysis is made of the impact of network management requirements, and an examination is made of the construction of the hardware needed for a multigigabit-per-second system. By proposing a simple byte-interleaving circuit configuration, it is shown that multiplexing multiples of eight are advantageous in terms of circuit simplicity. An example of an STM-64 multiplexing line terminal configuration is given View full abstract»

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  • NEMACS: the NEtwork MAnagement and Control Simulator

    Publication Year: 1991 , Page(s): 1027 - 1032 vol.2
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (544 KB)  

    The Network Management and Control Simulator (NEMACS) is a software tool for developing, testing, integrating and evaluating different network management (NM) techniques for multiservice circuit switched networks. NEMACS is designed to provide the modeling detail and flexibility required for research and development work in NM. NEMACS models network elements, signaling protocols, and exogenous network events to a level of detail sufficient for capturing network behavior pertinent to NM. Logical layering of call transport, call control, and network control functions in NEMACS provides flexibility in composition of both network scenarios and their respective NM strategies View full abstract»

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  • Virtual private data network service in the wide area networks

    Publication Year: 1991 , Page(s): 1033 - 1037 vol.2
    Cited by:  Patents (4)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (340 KB)  

    A technique is presented to satisfy the demand for customized user service through virtual private data networks (VPDN). It is reported that VPDN allows the creation and management of software defined private networks within the confines of the wide-area network (WAN). This solution is economically advantageous to customers because these private networks do not require capital investment in communication equipment. Its flexibility allows service providers to quickly introduce customized network environments. Virtual private data networks are secure, simple to manage, and easy-to-use View full abstract»

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  • Planar filtered techniques for burst mode carrier synchronization

    Publication Year: 1991 , Page(s): 365 - 369 vol.1
    Cited by:  Papers (35)  |  Patents (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (332 KB)  

    The author develops the ML estimator and the associated CRLB (Cramer-Rao lower bound) for a carrier with unknown frequency and phase. The CRLB can be used to derive a lower bound on the total phase error resulting from joint phase and frequency estimation. The ML estimator provides design guidelines for practical estimators. Several phase estimators are postulated and investigated. A practical, digitally implemented, planar filtered carrier synchronizer based on the structure of the ML estimator developed is presented View full abstract»

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  • Signal and interference statistics of a CDMA system with feedback power control

    Publication Year: 1991 , Page(s): 1490 - 1495 vol.2
    Cited by:  Papers (10)  |  Patents (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (492 KB)  

    A feedback power control approach that allows power commands to be updated at a higher rate than the rate of multipath fading is investigated. The signal and interference statistics as received at the base stations after power control are obtained for a simulated direct-sequence code-division multiple-access (CDMA) system, which includes multiple base stations with diversity receivers and a large number of power-controlled users continuously moving at various speeds. It is shown that often-used analyses based on perfect average power control lead to optimistic capacity results (by 25% to 60%) because interference is underestimated by 1 to 2 dB View full abstract»

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  • Coherent optical polarization-shift-keying (POLSK) homodyne system using phase-diversity receivers

    Publication Year: 1991 , Page(s): 1601 - 1605 vol.3
    Cited by:  Papers (3)  |  Patents (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (392 KB)  

    A polarization-shift-keying (POLSK) homodyne system using phase-diversity receivers is proposed. It has the advantages of both the homodyning and the polarization modulation scheme. Hence, it is attractive at a high bit rate and has no power penalty and no floor due to the influence of phase noise and offset frequency in the bit-error-rate (BER) performance. The authors theoretically analyze the receiver sensitivity and find that it is equal to that of the POLSK heterodyne system and that at a high signal-to-noise ratio (SNR), the degradation of the receiver sensitivity in the proposed system is much smaller than that in DPSK phase-diversity homodyne systems View full abstract»

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  • Dynamic traffic routing and network management

    Publication Year: 1991 , Page(s): 1346 - 1350 vol.2
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    An overview is presented of some of the papers on traffic routing presented at the 13th International Teletraffic Congress in Copenhagen, Denmark, in June 1991 View full abstract»

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  • Field experience with fiber-in-the-loop systems: reliability performance

    Publication Year: 1991 , Page(s): 584 - 589 vol.1
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (424 KB)  

    The authors address reliability issues from the perspective of accumulated experience with first-generation fiber-in-the-loop systems which have been serving customers for over three years. This experience indicates that the reliability of the service delivered by these systems, which depends on the quality built into them through quality assurance in the design and manufacturing processes and on their proactive maintenance means, is comparable to that of existing digital loop carrier systems. The active double star is found to be inherently more reliable than its passive counterpart. Comparison of projected and actual failure rates indicates that existing reliability-assessment procedures are overly conservative View full abstract»

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  • Models for overlapping coverage areas in cellular and micro-cellular communication systems

    Publication Year: 1991 , Page(s): 890 - 894 vol.2
    Cited by:  Papers (13)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (320 KB)  

    Several models are presented for overlapping coverage areas based on hexagonal, square and linear layouts of cells. Mixtures of these arrangements, as well as less regular configurations, are likely to arise as cellular and microcellular systems are deployed in high-density communication traffic areas and along roadways. For each layout, the fraction of total area that is covered by a given number of fixed sites is determined and plotted as a function of transceiver range View full abstract»

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  • The RACE programme-research for advanced communications in Europe

    Publication Year: 1991 , Page(s): 1496 - 1500 vol.2
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    The European Commission has launched the RACE programme (Research and Development in Advanced Communications in Europe) as a key element of the European telecommunications policy. Through cooperation around joint R and D projects, the main parties (telecommunications operators, industry, service providers, users, etc.) define and share the objectives for the use of advanced telecommunications networks and services for 1995 and beyond. The status of the programme and its future orientation are presented View full abstract»

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  • A novel architecture for queue management in ATM networks

    Publication Year: 1991 , Page(s): 1611 - 1618 vol.3
    Cited by:  Papers (1)  |  Patents (5)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (564 KB)  

    A queue management algorithm is described that manages the queued cells in such a way that higher-priority cells will always be sent to the links before the lower-priority ones, low-priority cells will be discarded when the queue is full, and same-priority cells are served fairly. The concept of assigning a departure sequence number to every cell in the queue is introduced so that the effects of the long-burst traffic to other regular arrival cells is avoided. Four architecture designs for queue management are presented, and their implementation feasibility and hardware complexity are compared. A novel architecture to implement the queue management is proposed. The architecture applies the concepts of fully distributed and highly parallel processing in order to schedule the cells sending or discarding sequences. The key VLSI chip used to implement the proposed architecture is described View full abstract»

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  • A generic digital switch interface (TR-303) for local access

    Publication Year: 1991 , Page(s): 2087 - 2091 vol.3
    Cited by:  Papers (2)  |  Patents (4)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (428 KB)  

    The authors describe a generic digital interface for local access that is being implemented by the leading switch vendors in North America in their local switches. With the availability of this interface for local switches, remote terminal vendors will be able to connect their products that are also built according to the interface requirements to create a multivendor integrated digital loop carrier (IDLC) system. After presenting the key features of the interface, operations interfaces needed to support an IDLC system are outlined. Some possible implementations of the interface in remote digital terminals are discussed. This is followed by a review of the application synergy of the two kinds (DSI and SONET) of IDLC systems. Also covered are some applications of this interface as a platform to support new services and architectures, such as the integrated services digital network, fiber in the loop, etc View full abstract»

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  • A graphical programming environment for switching software

    Publication Year: 1991 , Page(s): 807 - 811 vol.2
    Cited by:  Patents (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (408 KB)  

    A switching software design method aimed at substantially enhancing software productivity is described. The method, called DDL (data-driven logic), adopts a graphical programming technique using a dataflor graph for software representation. An execution mechanism for instructions in a dataflow graph is based on the data-driven rule. This method provides the advantages of easy design and reusable software components. A DDL graphical language specification is presented along with a DDL graphical development environment, and an evaluation of the DDL call-processing program, applied to a commercial PABX system View full abstract»

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  • Analysis of a broad band packet network with rate based network access control

    Publication Year: 1991 , Page(s): 324 - 330 vol.1
    Cited by:  Papers (1)
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    The author develops analytic models to analyze the performance of a broadband packet networks using a new rate-based network access control known as the distributed source control (DSC). The waiting time distribution at each queue is determined, as well as the size of the end-to-end window necessary to achieve a given throughput. The optimum rate or throughput in the sense of minimizing the network delay over throughput is found, and the effects of different burst sizes, cell arrival rate, link utilization, and link capacity on the network performance are studied. It is shown that, with proper choice of the DSC control parameters, one can achieve a good grade of service in terms of cell loss with a small pool of buffers even at high utilization View full abstract»

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  • Effect of contention resolution rules on the performance of deflection routing

    Publication Year: 1991 , Page(s): 1706 - 1711 vol.3
    Cited by:  Papers (2)  |  Patents (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (524 KB)  

    The authors investigate the effect of contention resolution (CR) rules on the performance of deflection routing. A new livelock-free prioritized CR rule, which is based on a packet's distance to the destination and the number of deflections suffered by it, is proposed. The performance-in terms of the average throughput, the average network delay and the delay distribution-of this CR rule is compared with those of other commonly used CR rules. Results show that prioritized CR rules improve the performance in networks using unbuffered deflection routing. It is observed that prioritized CR rules have hardly any effect on the performance of buffered deflection routing. These results suggest that using the random CR rule with output buffers is a better way to improve the performance than implementing complicated CR rules which sacrifice the switching speed inherent in deflection routing View full abstract»

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  • A non-regenerative repeating digital microwave radio system

    Publication Year: 1991 , Page(s): 1812 - 1816 vol.3
    Cited by:  Papers (2)
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    The authors present a nonregenerative repeating system using digital quadrature amplitude modulation (QAM) signals. The difference in cumulative degradation characteristics between regenerative and nongenerative repeating systems is discussed. In addition, the bit error rate performance of a repeater transmission is presented using 16-QAM signals at a 12.5-Mb/s transmission rate. Multirelay degradation factors and countermeasures against interference noise are considered, which are self-interference passing adjacent channels and cross-polarization interference. Calculated and experimental results using adjacent 16-QAM signals and dual-polarization 256-QAM signals are presented View full abstract»

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  • Application of object-oriented techniques to the OAM&P of telecommunications networks

    Publication Year: 1991 , Page(s): 634 - 637 vol.1
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    The author examines the recent efforts of the ANSI T1M1.5 working group and T1M1 committee to apply object-oriented (O-O) data modeling techniques to the development of standards for the operation, administration, maintenance, and provisioning (OAM&P) of telecommunications networks (TNs). The use of these state-of-the-art data modeling techniques is launching the North American telecommunications network into an open, standard, multi-vendor communications environment. The author presents a description of the organization of the T1M1 standards body, a brief overview of the Telecommunications Management Network (TMN) model, the basic principles of O-O data modeling, a description of recent network management standardization efforts in T1M1 that use these techniques, and a brief description of current T1M1 work View full abstract»

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  • Adaptive routing for lightwave shufflenet under unbalanced loads

    Publication Year: 1991 , Page(s): 1860 - 1864 vol.3
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (420 KB)  

    The authors consider the ideal case of complete and up-to-date knowledge of the traffic flow matrix and find the optimal probabilities of a node using a certain route so as to optimize a certain performance criterion. In one version, the criterion is equalizing the usage of all wavelengths in a mean square sense, and in another the criterion is the number of hops that a typical route traverses. A weighted version of the two criteria is also considered and compared with recent contributions dealing with distributed local state information. The combined analysis simulation routine is finally repeated in the case where a few link faults take place in conjunction with load unbalance View full abstract»

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  • Priority queueing strategies for traffic control at a multichannel ATM switching system

    Publication Year: 1991 , Page(s): 234 - 238 vol.1
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    The authors discuss the problem of furnishing an ATM-based B-ISDN (broadband ISDN) with two bearer services supporting different grades of transfer quality. By so doing, one is able to improve the utilization of network resources and provide a higher degree of flexibility. This is achieved by dynamically allocating network resources using priority classes. Several different loss priority queueing strategies are considered, namely complete sharing with push-out, complete sharing with push-out and head-of-the-line, partial buffer sharing, complete buffer partitioning but complete bandwidth sharing, and complete partitioning. A multichannel system model is developed for performance evaluation of these schemes. The authors develop performance bounds and compare these schemes in terms of performance and implementation complexity. They find that several-orders-of-magnitude improvement in the loss probability can be achieved for the high priority class with little impact on the low priority class performance View full abstract»

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  • A performance analysis of a high-speed slotted-ring access mechanism with dynamically adaptive slot sizes

    Publication Year: 1991 , Page(s): 1102 - 1109 vol.2
    Cited by:  Papers (1)
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    A network design is proposed in which the number of tokens has been made adaptive, resulting in a network that can be made to behave like both the token ring and the slotted ring, or anything in between (i.e., it performs optimally for any given message length). Results are presented that show how the number of tokens on the ring actually influences the behavior of the network. Simulation results are given that show the performance gain that is achieved by using this principle View full abstract»

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  • Performance analysis of reservation random access protocols for cellular packet communications

    Publication Year: 1991 , Page(s): 895 - 900 vol.2
    Cited by:  Papers (4)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (448 KB)  

    An analysis method for evaluating the performance of a class of RRA (reservation random access) protocols is developed. The method is based on a Markovian model whose stationary solution is obtained via an iterative computational procedure based on matrix decomposition techniques. Subject to a maximum delay constraint, the steady state probability of voice packet dropping is evaluated for three RRA protocol examples and comparisons are made with the performance of an ideal hypothetical multiplexer. Suggestions for the design of integrated voice/data RRA protocols are made. The transient performance of RRA protocols is evaluated View full abstract»

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  • Evolution of integrated digital loop carrier

    Publication Year: 1991 , Page(s): 2092 - 2099 vol.3
    Cited by:  Patents (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (448 KB)  

    Integration of the remote digital loop carrier (DLC) terminal with the local digital switch (LDS) represents a major step in the evolution of public telecommunications networks. The introduction of the TR-08 interface has allowed wide-scale deployment of the integrated DLC (IDLC) in a multivendor environment. However, the limitations and inflexibility of the interface have long since become apparent. In addition, TR-08 systems cannot be easily upgraded to provide advanced services or features. The shortcomings associated with TR-08 systems led equipment manufacturers to develop larger and more efficient IDLC products based on a more modern interface design. Due to an operations, administration, maintenance, and provisioning environment that cannot be changed quickly or easily, IDLC deployment has been slowed in some Bell Operating Company access networks. Next-generation systems have been specifically designed to facilitate the positioning of optical fiber-and thus broadband capacity-closer to the customer, ultimately to the curb or home. This is a major strategic goal shared by nearly all service providers today View full abstract»

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  • Traffic analysis for high speed networks

    Publication Year: 1991 , Page(s): 1421 - 1425 vol.2
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (412 KB)  

    A description is presented of the use of time series analysis techniques to characterize aspects of traffic patterns in high-speed wide-area communication networks. One aspect relates to the possible periodic behavior of the traffic; another aspect relates to the bursts or spikes characteristic of traffic approaching the maximum load. It is found that a time-of-day periodicity exists at several levels of network traffic and should be considered regardless of the analytical technique used to estimate traffic load. The authors have confirmed that a composite or average day model is not precise enough for modeling network traffic in their environment View full abstract»

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  • Encryption techniques for broadcast communication

    Publication Year: 1991 , Page(s): 195 - 200 vol.1
    Cited by:  Papers (1)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (468 KB)  

    A broadcast technique for encrypted communication is proposed that offers high levels of security with high transmission efficiency. Any encryption algorithm can be used without significantly degrading ciphertext length. The proposed scheme can use parallel processing techniques to realize rapid encryption speeds. Plaintext is processed to yield one common component and as many individual components as there are receivers. Because the common component is used for all receivers, the ciphertext is relatively short. If a public key cryptosystem is used, any receiver's decrypted plaintext can be compared with that of another receiver, thus preventing malicious sender attack View full abstract»

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