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As a breakthrough technology under 3GPP, LTE has attracted attention worldwide. Main features include enhanced peak data rates, lower delay, increased cell edge throughput. For an LTE system, serving a large number of users requires an efficient RRA algorithm which has not been standardized for the system and is still an open end for development. Researchers have proposed various algorithms some of...
To overcome the weak point that frames in original k-round elimination contention (k-EC) scheme do not have traffic differentiation, we propose a priority scheme with two access categories based on first-round-bye (FRB). High priority stations in this scheme carry out a round bye in the first round, while low priority stations contend. Saturation throughputs and saturation delays of the two priority...
Quality of service (QoS)-aware cyclic sleep controllers for optical network units (ONUs) have been proposed. However, sufficient performance has not been obtained because of sleep period limitation. This paper proposes a proportional-integral (PI)-based controller considering the sleep period limitation. Simulations confirm that the proposed controller improves the QoS.
Device-to-device (D2D) communication, where user equipments (UEs) in proximity communicate directly with each other, is an alternative technology for densification in future wireless communications featuring extremely dense and heterogeneous networks. The intrinsic characteristics of D2D communication include (1) limited energy capacity of battery powered UEs, (2) necessary power consumption to maintain...
In this paper, we propose a Group-Oriented QoS-Enhanced proportional fair (GQPF) scheduling algorithm, which aims at maximizing QoS throughput while still retaining fairness as well as maximizing system throughput in downlink OFDMA networks. GQPF proposes a Group-Oriented QoS-enhanced PF-based utility function for multi-channel OFDMA networks. We demonstrate via extensive simulation results, that...
Future-generation wireless networks are increasingly ubiquitous, which allows countless numbers of netizens to create, share and access live video sequences with several content forms and textures. As a result, there emerges a dire need for mechanisms to assess the quality of video transmission. Today's Mobile Networks are capable of solving many communication problems. However, it is very difficult...
This paper studies the impact of transmission rate control and pricing on the congestion management practices on bottleneck links of Internet service provider (ISP). QoS negotiation between ISP and users is conducted by letting users specify their minimum and maximum transmission rate required. Each link tentatively allocates the maximum transmission rates to the traffics that are going to cross it...
The complementary cumulative distribution function (CCDF) of delay in a wireless communication system can be approximated by the effective capacity model. However, it is still unknown if such a distribution function can be approximated analytically and accurately. In this paper, we consider a system model with a Nakagami-m fading channel and an exponential arrival process, and derive a simple approximation...
The packet scheduling problem has been deeply studied for lot of years by researchers in the computer science and telecommunications fields as an important solution that decides the order in which packets are sent over a link in order to provide QoS on a network. Recently, the packet scheduling has become again a challenging topic due to the massive use of wireless technologies (e.g. WiFi, LTE, 4G/5G),...
In this paper, we present a mechanism for scheduling multi-class traffic in a node of a packet-based communication network. We focus in particular on the output queues used for contention resolution at the output links of a network node. The mechanism, referred to as R-scheduling, is based on the use of in-queue reservations for future arriving data packets. Each traffic class has a given number of...
The Quality of Service (QoS) requirement of Random Access Procedure (RAP) emphasizes on success ratio and access delay in TD-LTE-A systems. In some applications like urgent communications, User Equipment (UE) will be labeled with different priority level. High priority UEs are critical to system implementation. In this paper, we proposed an Access Priority Level Based Random Access Scheme (APL-RA)...
In opportunistic spectrum access (OSA), not all the spectrum holes detected by Secondary System (SS) are available for SS users. Spectrum analysis is a required step before SS users access the detected spectrum holes in data slot. SS should make sure that the quality of service (QoS) of primary system (PS) users would still be acceptable after SS accessed the spectrum holes. This paper proposes a...
Recent advances in physical layer communication techniques, enable receivers to decode multiple simultaneous transmissions. This technique is known as the multipacket reception (MPR). In this paper, we propose an enhancement to the IEEE 802.11ac EDCA protocol for channels supporting MPR for QoS provisioning. We show that in the case of MPR, in addition to CWmin, CWmax and AIFSN, we can use two more...
Cloud computing that was introduced when local facilities could not any more satisfy access demands along with the increase of network bandwidth and diversity of services, breaks constraints of physical deployment and delivers varieties of services in its hardware/software virtualized manner. Being inherited the idea, the NaaS as a new presented research field ever since the cloud computing being...
OFDMA-based networks have been considered to be a promising solution to wireless networks especially for broadband multimedia mobile services. In this paper, we propose an enhanced proportional fair (E-PF) scheduling algorithm, which aims at maximizing QoS throughput while still retaining fairness as well as maximizing system throughput in downlink OFDMA systems. Proportional fair (PF) has emerged...
Deterministic network calculus (DNC) is not suitable for deriving performance guarantees for wireless networks due to their inherently random behaviors. In this paper, we develop a method for Quality of Service (QoS) analysis of wireless channels subject to Rayleigh fading based on stochastic network calculus. We provide closed-form stochastic service curve for the Rayleigh fading channel. With this...
In new generation cellular networks, opportunistic schedulers take advantage from the delay-tolerance of data applications to ensure that transmission occurs when radio channel conditions are most favourable. “Proportional Fair” (PF) is a well-known opportunistic scheduler that provides a good compromise between fairness and efficiency when transmitting long flows. Unfortunately, the PF algorithm...
The idea of converging voice and data into a best-effort service network, such as the Internet, has rapidly developed the need to effectively define the mechanisms for achieving preferential handling of traffic. This sense of QoS assurance has increased due to the enormous growth of users accessing networks, different types of traffic competing for available bandwidth and multiple services running...
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...
Many distributed real-time applications, such as audio-and video-conferencing and collaborative systems, require multicast support from the underlying network. Multicasting involves the delivery of messages over a tree rooted at the sender and whose paths lead to the various receivers. A major objective of the routing protocol is to build a tree with minimum cost. Finding such a tree is known to be...
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