LLQ in Integrated Services Networks

Integrated services networks integrate wide variety of services, such as voices, video, and data, onto a common infrastructure. There are however major obstacles to overcome, since different services not only have drastically different traffic characteristics, but also extremely diverse Quality of Service (QoS) requirements expressed in terms of delay, jitter, throughput and loss rate. An important issue in providing QoS is the choice of the packet service discipline at switching notes. Integrated services networks require a packet service discipline that can support both real-time services as well as non-real time services. This paper discusses a service discipline called Low Latency Queuing (LLQ), in terms of its delay performance in integrated services networks. Simulations results are presented, which show delay performance of LLQ in comparison to delay performance of Weighted Fair Queuing (WFQ).