Time slot allocation for loop networks

Details Time slot allocation for loop networks Time slot allocation for loop networks

H - Electricity

04

L

354/233

H04L 12/00 (2006.01) G06F 13/372 (2006.01)

Patent

CA 1289672

Abstract of the Disclosure An improved method of time slot allocation method for a loop network is disclosed. Loop networks for which the present invention is applied are of the type which is configured by loop-connecting a control station and a number of branch stations, and the control and branch stations each having at least one terminal connected thereto such that interstation communication, when demanded by a terminal, is made by passing a frame through the transmission path. The frame is formatted to consist of a synchronization area for indicating the leading end of the frame, a fixed-length control area, and a data area composed of a plurality of time slots. According to the invention, the control and branch stations are each allocated with a perdetermined or unique number of time slots to be used by terminals for interstation communication When a station has its reserve of unused time slots to fall below a preset lower limit, the control station supplements time slots from its own reserve. On the other hand, if a station has its reserve to exceed a preset upper limit, the station returns the excess time slots to the control station. Thus, time duration for a demand for communication to wait until line connection is established is reduced, with enhanced control station response. Also, efficiency of time slot use is enhanced, with a considerable reduction of in call losses.

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