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Flow control mechanisms for SAAL links

Signalling protocols in telecommunication networks provide for link-level flow-control procedures to ensure that the signalling traffic brought in by a link does not overwhelm the processing capacity on the receive end. This paper examines the flow-control procedures available in the signalling ATM adaptation layer (SAAL). The SAAL receiver effects flow control by granting an appropriate amount of credit to the SAAL transmitter; however, the details of how much credit is granted and when, are not standardized and left to implementation. This paper proposes two simple credit allocation schemes and provides guidelines for their parameterization. Since the receive buffer size depends on the credit mechanism, the paper also proposes buffer sizing guidelines. The work reported here was motivated by the need for flow control on SAAL links deployed in the current common channel signalling (CCS) networks. It is shown that flow-control becomes even more important in broadband networks, thereby requiring well designed credit control schemes.