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Effective multicast congestion control mechanism is urgently needed with the development of multimedia applications in Internet. Based on the analysis of the present layered multicast, a TCP-friendly active layered multicast congestion control mechanism with rapid self-adaptation at receivers called ALMCC is proposed. It uses active label layering and adapts to the bandwidth of network rapidly at...
Multicast services are used in emerging multimedia applications based on Quality of Service (QoS) development of multimedia group application and the construction of multicast routing tree is significant. Upper bound on the delay between sender and receiver is one of the common QoS constraints. Delay-constrained routing protocols are used to find paths subject to the delay constraint while efficiently...
The WiMAX technology based on IEEE 802.16 is expected to support multimedia services with guaranteed quality of service (QoS). In this paper, a scheduler structure with priority classes is designed for IEEE 802.16 wireless networks, and a channel quality dependent rate-limited (CD-RL) algorithm is proposed. CD-RL provides promised data rates while taking throughput into account. With a carefully designed...
We design a resource allocation algorithm for downlink of orthogonal frequency division multiple access (OFDMA) systems supporting real-time (RT) and best-effort (BE) services simultaneously over a time-varying wireless channel. The proposed algorithm aims at maximizing system throughput while satisfying quality of service (QoS) requirements of the RT and BE services. We take two kinds of QoS requirements...
We propose analytic model to compute the delay of the binary exponential backoff (BEB) protocol as a collision resolution algorithm. When a packet which tries to reserve a channel collides n times, it chooses one of the next 2n frames with equal probabilities and attempts the reservation again. We derive the expected access delay until an arbitrary packet reserves a channel. Then the expected transmission...
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