Statistical time division multiplexing - définition. Qu'est-ce que Statistical time division multiplexing
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Qu'est-ce (qui) est Statistical time division multiplexing - définition

Statistical multiplexer; Packet mode; Statistical multiplexor; Packet oriented; Stat-mux; Statmux; Stat mux; Variable bandwidth multiplexing; Variable capacity multiplexing; Statistical multiplexing; Statistical time division multiplexing

statistical time division multiplexing         
<communications> (STDM, StatMUX) A system developed to overcome some inefficiencies of standard {time division multiplexing}, where time slices are still allocated to channels, even if they have no information to transmit. STDM uses a variable time slot length and by allowing channels to vie for any free slot space. It employs a buffer memory which temporarily stores the data during periods of peak traffic. This scheme allows STDM to waste no high-speed line time with inactive channels. STDM requires each transmission to carry identification information (i.e. a channel identifier). To reduce the cost of this overhead, a number of characters for each channel are grouped together for transmission. ["Data Communications, Computer Networks and Open Systems", Halsall & Fred, Addison Wesley, p160-161, 1995]. ["Digital, Analog, and Data Communication", Sinnema & McGovern, Prentice Hall, p245, 1986]. (1997-03-05)
Statistical time-division multiplexing         
Statistical multiplexing is a type of communication link sharing, very similar to dynamic bandwidth allocation (DBA). In statistical multiplexing, a communication channel is divided into an arbitrary number of variable bitrate digital channels or data streams.

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Statistical time-division multiplexing

Statistical multiplexing is a type of communication link sharing, very similar to dynamic bandwidth allocation (DBA). In statistical multiplexing, a communication channel is divided into an arbitrary number of variable bitrate digital channels or data streams. The link sharing is adapted to the instantaneous traffic demands of the data streams that are transferred over each channel. This is an alternative to creating a fixed sharing of a link, such as in general time division multiplexing (TDM) and frequency division multiplexing (FDM). When performed correctly, statistical multiplexing can provide a link utilization improvement, called the statistical multiplexing gain.

Statistical multiplexing is facilitated through packet mode or packet-oriented communication, which among others is utilized in packet switched computer networks. Each stream is divided into packets that normally are delivered asynchronously in a first-come first-served fashion. In alternative fashion, the packets may be delivered according to some scheduling discipline for fair queuing or differentiated and/or guaranteed quality of service.

Statistical multiplexing of an analog channel, for example a wireless channel, is also facilitated through the following schemes:

  • Random frequency-hopping orthogonal frequency division multiple access (RFH-OFDMA)
  • Code-division multiple access (CDMA), where different amount of spreading codes or spreading factors can be assigned to different users.

Statistical multiplexing normally implies "on-demand" service rather than one that preallocates resources for each data stream. Statistical multiplexing schemes do not control user data transmissions.