In Broadband Wireless Access (BWA) networks, provisioning of Quality of Service (QoS) is absolutely essential for real time and non real time services. Congestion in these networks can lead to deterioration in QoS experienced by the network users. Congestion avoidance is rarely considered to ensure the QoS of wireless connections. Efforts are mainly aimed at reducing the overload once it has occurred. To avoid congestion at the base station in WiMAX networks, the WiMAX Fair Intelligent Congestion Control (WFICC) was proposed to ensure the traffic is scheduled in such a way that the base station output buffer operates around a target operating point without violating the QoS requirements of connections. The aim of this paper is to investigate WFICC thoroughly and evaluate its performance in terms of throughput, delay and jitter for different Classes of Services (CoSs) under various parameter settings of the algorithm. A detailed and comprehensive simulation study on various settings of parameters is performed in ns-2. The results show that WFICC performs excellently in allocating resources fairly among Class of Services (CoSs) and also preserves their QoS requirements. Furthermore, WFICC is robust and easily adapted to various traffic conditions. © World Scientific Publishing Company.
Furqan, F & Hoang, DB 2013, 'LTE_FICC: A New Mechanism for Provision of QoS and Congestion Control in LTE/LTE-Advanced Networks', Mobile and Ubiquitous Systems: Computing, Networking, and Services, International Conference on Mobile and Ubiquitous Systems: Networks and Services, Springer, Tokyo, Japan, pp. 768-781.View/Download from: Publisher's site
In Long Term Evolution (LTE)/LTE-Advanced architecture, the basic schedulers allocate resources without taking congestion at the Evolved NodeB (eNodeB's) output buffer into account. This leads to buffer overflows and deterioration in overall Quality of Service (QoS). Congestion avoidance and fair bandwidth allocation is hardly considered in existing research for the LTE/LTE-Advanced uplink connections. This paper introduces a mechanism for LTE and LTE-Advanced, LTE Fair Intelligent Congestion Control (LTE_FICC), to control congestion at an eNodeB. LTE_FICC jointly exists with the scheduler at the eNodeB to guarantee efficient traffic scheduling, in order to make the output buffer operate around a target operating point. LTE_FICC also overcomes the problem of unfair bandwidth allocation among the flows that share the same eNodeB interface. LTE_FICC is simple, robust and scalable, as it uses per queue rather than per flow accounting. To evaluate the effectiveness of the proposed algorithm, simulations were performed in Opnet using LTE module. The results demonstrated that LTE_FICC controls the eNodeB buffer effectively; prevents overflows; and ensures the QoS of flows in terms of fair bandwidth allocation, improved throughput and reduced queuing delay.
Furqan, F, Hoang, DB & Collings, I 2014, 'Effects of quality of service schemes on the capacity and dimensioning of LTE networks', Proceedings of the 2014 IEEE International Performance Computing and Communications Conference (IPCCC), IEEE International Performance Computing and Communications Conference, IEEE, Austin, USA, pp. 1-8.View/Download from: Publisher's site
With high data rate and mobility support wireless networks are becoming an integral part of the ubiquitous broadband access. Appropriate dimensioning of the wireless access networks is essential to satisfy users' Quality of Service (QoS) requirements. Once the network is dimensioned, dynamic variations in traffic or population distribution can affect the capability of the network to deliver the agreed QoS of connections. Consequently, re-dimension the network may be necessary. Current researches do not discuss the effects of QoS schemes on the capacity of the network. In this paper, we investigate the impact of QoS schemes on the capacity of the network. The objective is to determine the capability of the network to deal with the variations in the demography of the covered area and the user's traffic profile with the proposed QoS schemes including Congestion Control (CC) and Radio Admission Control (RAC). Different scenarios are presented to evaluate the effects of QoS schemes on the capacity of the network. This investigation will assist network operators to determine the point after which the network needs to be re-dimensioned.
Furqan, F, Hoang, DB & Collings, IB 2014, 'LTE-Advanced fair intelligent admission control LTE-FIAC', 2014 IEEE 15th International Symposium on A World of Wireless, Mobile and Multimedia Networks (WoWMoM), IEEE International Symposium on A World of Wireless, Mobile and Multimedia Networks, IEEE, Sydney, NSW.View/Download from: Publisher's site
Radio Admission Control (RAC) is a key function of the Radio Resource Management (RRM) at layer 3 of an eNodeB; however, the 3GPP standard does not specify the RAC and is left as an eNodeB vendor specific. Most admission control schemes proposed to date do not ensure differentiation among the users at different priority levels. Also, they do not provide fairness among the users with the same priority. This paper proposes a novel RAC scheme for Long Term Evolution (LTE-Advanced) networks based on the combined idea of complete sharing and virtual partitioning. It introduces a step wise degradation scheme, to prioritize the high priority traffic in state of resource limitations. A detailed and comprehensive simulation is performed in Opnet to show the efficiency of the proposed RAC scheme. The simulation results demonstrate that the proposed RAC scheme minimizes the call blocking probability and adheres extremely well to the bandwidth constraints of different traffic types.
Furqan, F & Hoang, DB 2013, 'WFICC: A new mechanism for provision of QoS and Congestion Control in WiMAX', 2013 IEEE 10th Consumer Communications and Networking Conference, CCNC 2013, IEEE Consumer Communications and Networking Conference, IEEE, Las Vegas, USA, pp. 552-558.View/Download from: Publisher's site
In WiMAX architecture the base station lacks the mechanisms to avoid it from being overloaded, which can lead to degradation in the Quality of service (QoS) experienced by the users in the cell, as the large queue at buffer risk high delays and buffer ov
Furqan, F & Hoang, DB 2013, 'Wireless Fair Intelligent Admission Control -- WFIAC', Advanced Information Networking and Applications, International Conference on Advanced Information Networking and Applications (was ICOIN), IEEE, Barcelona, Spain, pp. 1001-1008.View/Download from: Publisher's site
In next generation wireless networks like WiMAX, a dynamic Call Admission Control (CAC) plays an important role to ensure Quality of Service (QoS) of existing users and to efficiently utilize network resources. We propose a predictive CAC namely Wireless Fair Intelligent Admission Control (WFIAC) that admits or rejects a new incoming connection base on resource availability and load in the network. The proposed CAC works in conjunction to a load control module namely WiMAX Fair Intelligent Congestion Control (WFICC) to determine load in network. The proposed CAC is based on bandwidth borrowing and degradation of over provisioned connections in order to minimize blocking probability and to maximize resource utilization in the network. Once the network load reduces, WFICC upgrades the bandwidth allocated to connections that have data to send. So, WFIAC along with WFICC ensures the network operates around a target operating point to guarantee QoS to end users. A detailed and comprehensive simulation is performed in ns-2 to show the efficiency of the proposed CAC scheme in terms of blocking probability of different service classes and QoS provisioning to existing connections when the network is in congested and non congested state.
Furqan, F & Hoang, DB 2011, 'Analysis of Parameters Contributing Performance and Coverage of Mobile WiMAX with Mix Traffic', 2011 12th International Conference on Parallel and Distributed Computing, Applications and Technologies (PDCAT), International Conference on Parallel and Distributed Computing, Applications and Technologies, IEEE, Gwangju, China, pp. 313-318.View/Download from: Publisher's site
With high data rate and mobility support wireless networks are becoming an essential access component and an integral part of the ubiquitous Internet. As the provision of wireless networks is cost effective, they are being adopted for broadband access in rural areas (e.g., the Australian National Broadband Network). In this paper we present a comprehensive study of the parameters that effect both the capacity and coverage of IEEE 802.16e WiMAX which will serve as a basis for designing an effective access network including network dimensioning and provisioning QoS for dynamic and mixed distribution of services. In particular, the effect of physical and MAC layer overhead is considered for capacity evaluation with a simple scheduler. The paper also discusses the usage of compressed MAPs with SUB-DL-UL-MAP to reduce overheads and increase network capacity. Different scenarios are presented to evaluate the effect of standard and compressed overhead on capacity and coverage