System and method for accommodating ABR and CBR traffic on a shared communications channel
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United States of America Patent
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Nov 24, 1998
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app pub date -
Aug 30, 1996
filing date -
Aug 30, 1996
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Abstract
A system and method for managing the bandwidth of a shared communications channel is described. The shared channel connects a master station with a number of client stations. The shared channel supports ABR (Available Bit Rate) data and CBR (Constant Bit Rate) data. The bandwidth is divided by the master station into time slots. The slots are characterized as contention ABR slots, reserved ABR slots, and CBR slots, and are grouped into frames. The ABR slots of each frame form one region of the frame, and the CBR slots of each frame form another region of the frame. As CBR calls are set up and taken down, the CBR region is allowed to grow and contract. Reservation requests for blocks of consecutive ABR slots are made by the client stations in contention ABR slots. The master station may expand the ABR region of a given frame to accommodate such a reservation. If the master station does expand the ABR region, it defers the CBR slots of the same frame, and contracts the ABR region of subsequent frames, accordingly.
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