Adaptive transmission in multi-access asynchronous channels
DCFirst Claim
1. A method of communication over a shared transmission medium, comprising:
- defining a transmission cycle having a first portion and a second portion which are alternately repeated by defining an adaptive time-division multiplexing transmission cycle portion and a residual transmission cycle portion;
allocating a part of the first transmission cycle portion to each of a plurality of network entities employing the shared transmission medium; and
allocating parts of the second transmission cycle portion as available to network entities employing the shared transmission medium based on primacy of requests for access to the shared transmission medium.
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Litigations
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Accused Products
Abstract
A hybrid transmission cycle (HTC) unit of bandwidth on a shared transmission medium is defined to include an adaptive, time division multiplexing transmission cycle (ATTC), which is allocated in portions sequentially among all participating network entities, and a residual transmission cycle (RTC), which is allocated in portions, as available, to the first network entity requesting access to the shared medium during each particular portion. The ratio of logical link virtual channels, or D-Channels, to data payload virtual channels, or B-Channels, within the ATTC is adaptive depending on loading conditions. Based on transmission profiles transmitted on the D-Channels during the ATTC, each network entity determines how many B-Channels it will utilize within the current HTC. This calculation may be based on any decision network, such as a decision network modelling the transmission medium as a marketplace and employing microeconomic principles to determine utilization. The ratio of the duration of the ATTC segment to the duration of the RTC segment is also adaptive depending on loading conditions, to prevent unacceptable latency for legacy network entities employing the shared transmission medium. During the RTC, utilization of the shared medium preferably reverts to IEEE 802.3 compliant CSMA/CD transmission, including transmissions by HTC-compliant network entities.
36 Citations
8 Claims
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1. A method of communication over a shared transmission medium, comprising:
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defining a transmission cycle having a first portion and a second portion which are alternately repeated by defining an adaptive time-division multiplexing transmission cycle portion and a residual transmission cycle portion; allocating a part of the first transmission cycle portion to each of a plurality of network entities employing the shared transmission medium; and allocating parts of the second transmission cycle portion as available to network entities employing the shared transmission medium based on primacy of requests for access to the shared transmission medium. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification