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Providing QoS guarantees, boosting throughput and saving energy over wireless links is a challenging task, especially in emergency networks, where all of these features are crucial during a disaster event. A common solution is using a single, integrated scheduler that deals both with the QoS guarantees and the wireless link issues. Unfortunately, such an approach is not flexible and does not allow...
We study the resource scheduling for Wireless Sensor Network (WSN) based on Single Carrier Frequency Division Multiple Access (SC-FDMA) technique. This work distinguishes itself from the existing work in: 1) the scheduling for a relay network, 2) the scheduling for multimedia-enabled sensor nodes taking into account diverse QoS characteristics such as delay sensitive (DS), rate sensitive (RS), best...
The IEEE 802.11e standard was designed to support Quality of Service (QoS) at the MAC layer to support incapability of real-time traffic. The real-time safety messages in critical VANETs environment are guaranteed high priority transmission as a requirement of DSRC. Due to the intermittent connection in VANETs, the transmission of real-time traffic data frame needs to obtain a higher priority of channel...
We report an experimental investigation on the measurement of the available bandwidth for users in Gigabit Passive Optical Networks (GPON) and the limitations caused by the Internet protocols. We point out that the huge capacity offered by the GPON highlights the enormous differences that can be showed among the available and actually exploitable bandwidth in the case of TCP. In this ultrabroadband...
Datacenters consolidate diverse applications to improve utilization. However when multiple applications are co-located on such platforms, contention for shared resources like Networks-on-Chip (NoCs) can degrade the performance of latency-critical online services (high-priority applications). Recently proposed bufferless NoCs have the advantages of requiring less area and power, but they pose challenges...
Recently, LTE-based femtocell system has received significant attention as a promising solution offering high-speed services, enhanced indoor coverage and increased system capacity. Intelligently allocate resources in multi-user OFDMA-based network is the substantial aim towards interference mitigation and enhancing power and spectral efficiencies. In this paper, we propose a downlink joint resource...
We demonstrate the practical implementation of a schema for Smart Grid Last Mile (SGLM) traffic management in leased Internet access networks, based on well-known queue management and traffic marking algorithms such as Random Early Drop and Token Bucket. Internet access links are often over-provisioned, with much higher installed capacity than user needs, so domestic applications do not compete for...
IEEE 802.11 standard primarily utilizes Distributed Coordination Function (DCF) which is based on carrier sense multiple access with collision avoidance (CSMA/CA). IN DCF, when a collision occurs, then a backoff algorithm will take place to randomize medium access for the nodes. The default backoff mechanism used in 802.11 is the binary exponential backoff (BEB) algorithm. In this paper, we analyze...
WiMAX refers to Wireless Interoperable implementations of the IEEE 802.16 standards ratified by the WiMAX Forum has a main goal to deliver wireless communications with quality of service in a secured environment. The WiMAX MAC layer is designed to support different types of applications and services having different Quality of service (QoS) requirements. In addition of providing higher throughput...
Emerging multimedia services are spreading significantly thanks to the availability of high speed wireless networks. Network operators are facing the challenges to accommodate these services (e.g. Skype, interactive gaming, and other multimedia applications) with high user satisfaction. This paper presents a Quality of Experience (QoE) driven approach to allocate the radio resources in Long Term Evolution...
Power Line Communications standards, such as Homeplug and IEEE 1901, aim to provide strict channel access prioritisation in CSMA/CA mode. This is achieved by making lower-priority access categories postpone contention when packets belonging to categories with higher priority are pending for transmission. For this purpose, specific slots in which stations advertise the priority of the current packets...
Efficient Quality of Service (QoS) has become new challenge in Wireless Local Area Networks (WLANs). Voice over Internet Protocol (VoIP) is an important service with strict quality of requirements in Wireless Local Area Network (WLANs). The IEEE802.11e introduced a contention window based technique that is Enhanced Distribution Channel Access (EDCA) that provides a prioritized traffic to guarantee...
To date, there have been many developments in Communications Networks which have resulted in the complex structure of Internetworks. To tackle this complexity and achieve the peak performance and security in such implementations, various network management practices are introduced. The scope of this paper is to study the impact that the novel concept of Bring Your Own Technology (BYOT) will have on...
Quality of Service (QoS) in Network-on-Chip (NoC) become an important research area. Lately, increasing demands on availability, performance and reliability of Network on Chip connectivity are driving to offer Network connections with QoS guarantees efficiency. However, until now there is no standard method of the Quality of Service (QoS) measurement and less techniques have been used to provide its...
Current Active Queue Management (AQM) and TCP are designed to work well for wired networks where packet loss is mainly due to network congestion. In wired cum wireless networks, however, wireless bandwidth is much smaller than the wired network and at base station packet loss occurs due to bottleneck wireless link. As a result, the performance of TCP flows is significantly degraded. To overcome this...
Mobile Ad Hoc Networks (MANETs) are a self-configuring network of mobile nodes connected by wireless links where each mobile node works as a host as well as a router. With the growth and proliferation of these devices in every aspect of society, the need for such devices to communicate in a seamless manner is becoming increasingly essential. Applications supported by MANETs have stringent Quality...
In this paper, we propose a new scheduling algorithm for IEEE802.16 Broadband wireless Metropolitan Area Networks in TDD mode. Based on some known algorithms such as Modified Deficit Round Robin (MDRR), Proportional Fairness (PF) and Adaptive Proportional Fairness (APF), we have studied the scheduling problem and proposed scheduling algorithm, called (Enhanced-APF) for focuses on an efficient mechanism...
Nowadays QoS enabled real time services are demanding and dominating over Internet. However, providing end-to-end QoS requirement across Internet is still a challenge. With changing challenges and demands, service providers should be able to implement their strategic and business policies dynamically. Therefore current Internet architecture needs a change to support the present and future requirements,...
Resource allocation is one of the key issues in long term evolution (LTE) systems. In this paper, we propose an adaptive resource allocation scheme with quality of service (QoS) guarantees to maximize system throughput for high-speed mobile LTE systems. In this scheme, considering that channel quality indicator (CQI) might be changed in fast mobile scenarios which can reduce the system throughput,...
Mobile communication systems are equipped with multiple network interfaces. Wireless Fidelity (WiFi) and 3rd Generation (3G) are the most widely implemented interfaces in the latest mobile communication devices and therefore being able to fulfil most of the computing aspects. Nowadays, most modern mobile devices suffer from the interoperability between the WiFi and 3G interfaces, each access technology...
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