Flow control mechanism of ABR traffic in ATM networks

Details Flow control mechanism of ABR traffic in ATM networks Flow control mechanism of ABR traffic in ATM networks

1997-07-07

1999-11-23

Pham, Chi H.

Multiplex communications

Data flow congestion prevention or control

Control of data admission to the network

370253, 370395, 370235, H04L 1226

Patent

active

059912685

ABSTRACT:
An ATM network carries several categories of services, each having its own traffic characteristics and performance requirements. The ABR (available bit rate) service category is the only existing one suited for high-reliability data communications, such as file transfer, LAN emulation, etc. The invention relates to the control of ABR traffic flow in an ATM network, to quickly utilize the bandwidth left unused by higher priority service categories while minimizing ABR cell loss, and maintaining fairness among ABR connections. On each ABR connection, the source end system periodically sends RM (resource management) cells to the corresponding destination end system which loops them back to the source. The ATM network may instruct the ABR sources of the exact rates it can support by modifying a certain field in the RM cells. The invention relates to techniques of deriving the proper explicit cell rate for each ABR connection which can grow to a fair level even under special conditions.

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