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Considering a tandem network of queues (each representing the buffer in a router) our objective is to allow each individual queue to dynamically control its own parameters (in this paper the buffer size) using only information available locally and from neighboring nodes. For each node we adopt control approaches that are based on Infinitesimal Perturbation Analysis (IPA) estimates of certain performance...
The volume of Internet traffic increases every year, caused by increased amounts of individual information. Quality of Service (QoS) controls is necessary to manage this traffic. Differentiated Service (Diffserv) is a promising technique to realize scalable QoS control in the internet; extensive efforts have been made for its practical use and it is already introduced in some networks. The control...
For the issue of resource allocation in a heterogeneous multi-user downlink OFDMA system with both delay-constrained (DC) and non-delay-constrained (NDC) traffic, this paper proposes suboptimal joint subcarrier and power allocation (JSPA) for channel-aware queue-aware(CAQA) scheduling. The objective is to maximize the sum of all NDC users' logarithmic utility functions (achieving proportional fairness)...
Diffserv(Differentiated Service) is a promising technique to realize scalable QoS control in the internet. Therefore, extensive efforts have been made for the practical use of this technique. Diffserv is already introduced in some networks. Control functions for Diffserv are installed in edge routers and core routers. This enables a scalable QoS control as mentioned above. This paper proposes a new...
In this paper, we consider the important aspect of quality of service (QoS) in wireless mesh networks, focusing on packet delays and packet drops. We observe that the options of solely focusing on throughput, and of only depending on the QoS type characterization by the application level protocol is not sufficient. We propose the use of multiple queues to hold the packets based on their QoS requirement...
This paper presents a comprehensive system modeling and analysis approach for both predicting and controlling queuing delay at an expected value under multi-class traffic in a single buffer. This approach could effectively enhance QoS delivery for delay sensitive applications. Six major contributions are given in the paper: (1) a discrete-time analytical model is developed for capturing multi-class...
In this study, a wavelength grouping approach has been proposed for core nodes in OBS in order to control byte drop rates for different classes of traffic. Preemptive Channel Scheduling Algorithm (PCSA) has been used for channel scheduling in OBS. In terms of performance criteria, loss rate in bytes is considered. A 2-state MMPP (Markov Modulated Poisson Process) traffic generator on a 14-node mesh...
We consider the problem of optimal power control for quality-of-service-assured wireless communication. The quality of service (QoS) measures of our consideration are a triplet of data rate, delay, and delay bound violation probability. Our target is to develop power control laws that can provide delay guarantees for real-time applications over wireless networks. The power control laws that aim at...
In the current queue scheduling algorithm, there is no the algorithm that completely meets the requirements of PHB in DiffServ networks. Therefore, how to improve the scheduling algorithm aiming at the requirements for different traffic Qos is a problem needing to be handled immediately. Firstly, the existing queue scheduling algorithms supporting DiffServ are researched and compared for performance...
This paper proposes a control-theoretic modeling approach for service differentiation in multi-hop ad-hoc networks, in which a new priority scheme is applied by considering variable control gains and so-called transmission opportunity (TXOP) limits. The model is studied and evaluated based on an IEEE 802.11 DCF WLAN system using the well-known 20-sim dynamic system simulator. The use of the control-theoretical...
Congestion control maintains the number of packets within the network below a certain level to avoid low performance. And queue management is an important and critical component of any network implementation. RED is proposed to overcome some shortcomings of traditional methods for queue management and is proved to be more efficient than drop tail. In this paper we design a network environment using...
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