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Communications Magazine, IEEE

Issue 9 • Date Sept. 1991

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Displaying Results 1 - 8 of 8
  • Wireless digital communication: a view based on three lessons learned

    Publication Year: 1991 , Page(s): 33 - 36
    Cited by:  Papers (64)  |  Patents (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (404 KB)  

    The implications of Shannon's information theory for personal communication network (PCN) design are outlined. Examples of improvements in satellite communication, magnetic recording, and modem technologies that have increasingly approached information-theoretic limits are given. The emphasis is on the application of Shannon's work to control of four types of interference: multi-user, multiple cell, multipath, and multiple media. Code-division multiple access (CDMA), time-division multiple access (TDMA), and frequency-division multiple access (FDMA) techniques in personal communications are compared.<> View full abstract»

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  • A new direction for broadband ISDN

    Publication Year: 1991 , Page(s): 39 - 42
    Cited by:  Papers (14)  |  Patents (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (421 KB)  

    The industry strategy to introduce broadband ISDN is addressed. This strategy is placed within a marketing context, and possible ramifications are considered. It is suggested that the current vision of a complex, multifeatured network rolling out in 1994 may be overly ambitious and still not meet end-user needs. An alternate strategy based on a minimal technical solution is derived and discussed.<> View full abstract»

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  • Broadband ISDN resource management: the role of virtual paths

    Publication Year: 1991 , Page(s): 44 - 48
    Cited by:  Papers (49)  |  Patents (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (651 KB)  

    It is shown that virtual paths will be a substantial component of a resource management control hierarchy for the B-ISDN. Other components of this hierarchy include connection admission, usage parameter control, and reactive congestion control. An overview of this control hierarchy is provided. The role of virtual paths for cost-effective resource management and connection admission control in the B-ISDN is examined. Some strategies for reserving capacity on virtual paths are identified, and the use of virtual paths to simplify connection admission control is discussed. The reservation of capacity on virtual path connections is shown to result in substantial network cost savings for the case study considered.<> View full abstract»

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  • Variable-bit-rate traffic control in B-ISDN

    Publication Year: 1991 , Page(s): 50 - 56
    Cited by:  Papers (29)  |  Patents (5)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (631 KB)  

    Four service categories, corresponding to recognized user demands, whose traffic control requirements are distinct are identified. The dependence of the traffic control strategy on the behavior of asynchronous transfer mode (ATM) multiplexers as queuing systems is discussed, and qualitative conclusions are drawn about the nature of the dependence of performance on capacity and offered traffic from the results of recently developed queuing models. In discussion traffic control alternatives, attention is restricted to one aspect of traffic control: the relationship between traffic descriptors, admission control procedures, and traffic parameter enforcement. The results of the analysis concerning the appropriate form of control for the four service categories are summarized.<> View full abstract»

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  • Traffic control in asynchronous transfer mode

    Publication Year: 1991 , Page(s): 58 - 62
    Cited by:  Papers (9)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (357 KB)  

    The definition of traffic descriptors is discussed, and cell delay variation (CDV) that complicates usage parameter control (UPC) is analyzed. A generic flow control protocol that facilitates UPC is described. It is based on the asynchronous transfer mode ring (ATMR) protocol. The ATMR-GFC protocol achieves the guarantee of bandwidth by a cyclic reset scheme. Bandwidth calculation methods for connection admission control are reviewed from the viewpoint of different time scales. Both a real-time and offline calculation method are discussed. A combined method taking advantage of both methods is proposed.<> View full abstract»

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  • Controlling congestion in B-ISDN/ATM: issues and strategies

    Publication Year: 1991 , Page(s): 64 - 70
    Cited by:  Papers (26)  |  Patents (4)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (650 KB)  

    The high-level goals of a congestion control architecture are outlined. The controls are discussed in detail, focusing on the set of controls exercised by the network and the functionality needed at the network access and in the internal network elements. The end system controls are discussed only to the extent that they can benefit from the available network controls. The motivation for the suggested controls is discussed by describing their use for selected traffic types. Example traffic types and the use of some of the controls to support these traffic types in an integrated environment are examined.<> View full abstract»

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  • ATM-layer OAM: principles and open issues (B-ISDN)

    Publication Year: 1991 , Page(s): 75 - 78
    Cited by:  Papers (6)  |  Patents (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (328 KB)  

    The principles of operation and maintenance (OAM) for broadband ISDN access, as well as some general OAM rules for an asynchronous transfer mode (ATM) network, are discussed. Standardization of the OAM functions and mechanisms for the ATM layer, which is based primarily on CCITT Recommendations, is considered. Issues regarding OAM flow at the ATM layer are examined. It is seen that although references can be made both to basic and primary rate ISDN, new solutions are necessary for the OAM of B-ISDN. Issues requiring further study are identified.<> View full abstract»

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  • ATM-layer OAM implementation issues (B-ISDN)

    Publication Year: 1991 , Page(s): 79 - 81
    Cited by:  Papers (1)  |  Patents (8)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (252 KB)  

    Some implementation issues pertaining to the asynchronous transfer mode (ATM) layer operations and maintenance (OAM) functionality are addressed. A brief summary is given of the current understanding in CCITT on ATM-layer OAM implementation. This is followed by discussions of fault management and performance management function implementations for the ATM virtual path connection and virtual channel connection. Some selected points for study are identified.<> View full abstract»

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Aims & Scope

IEEE Communications Magazine covers all areas of communications such as lightwave telecommunications, high-speed data communications, personal communications systems (PCS), ISDN, and more.

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Editor-in-Chief
Osman Gebizlioglu
Huawei Technologies