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Effective ways to address spectrum shortage by sharing cellular spectrum among the operators are constantly explored. Inter-Operator spectrum sharing, where operators dynamically share their licensed spectrum, when the network capacity requirement varies based on user access is an option to address this issue. The emerging licensed Co-Primary spectrum sharing, a commonly shared spectrum band used...
The Internet of Things (IoT) is a new generation of network that can remotely and intelligently control distributed objects. Due to the large number of objects in the IoT, a high data traffic for the object communications is required, which is mostly routed through wireless links. However, the available spectrum for radio frequency (RF) wireless communications is exhausted so that each user in the...
Non-orthogonal multiple access (NOMA) can increase the spectral efficiency and could play an important role in improving the capacity of 5G networks. In this paper, an optimization problem is formulated to maximize the overall sum rate in a sub-carrier based NOMA system. The optimal transmission power of each user is obtained based on the users' instantaneous channel state information under the total...
We consider traffic engineering (TE) in networks where quality of service (QoS)-guaranteed as well as best effort (BE) services are present. We propose a joint TE optimization technique for both QoS and BE traffic using multi-objective optimization framework. We show that joint TE optimization results in more efficient network resource usage compared to sequential TE methodology where TE decision...
In this paper, we investigate the energy-efficient uplink radio resource allocation scheme with quality of service (QoS) guarantees in heterogeneous wireless networks. All mobile terminals (MTs) have multi-homing capability, which can communicate with access points (APs) of the multiple radio access technologies (RATs) simultaneously. Currently, the energy efficiency (EE) is very important in the...
Programmability in wireless access networks can provide unprecedented flexibility in meeting the communications needs of a diverse set of wireless devices under changing demand and network conditions. Programmability also holds the promise of enabling multiple simultaneous virtual operators providing a variety of access networks that offer different services using different business models. In this...
In this paper we introduced two enhancement modifications to the well-known TCP Westwood fast retransmission and fast recovery mechanisms. Firstly, a new modification is introduced to fasten the fast retransmission procedure by preventing the TCP sender side from waiting the third duplicate ACKs to retransmit lost packets. Secondly, further modification is presented to achieve better recovery for...
Network selection plays an important role in load balancing and radio resources management. In this paper, we use the evolutionary game theory to address the network selection problem in the constrained heterogeneous networks. An indication function is introduced into the payoff function to represent the punishment term. The population dynamics can be obtained by the replicator equations. A centralized...
The Voice over IP (VoIP) service demands high priority over other services and applications. Some constrains are associated with this real-time service, such as delay and throughput which need to be addressed before delivering to the customer. The mobility in IP networks is a demand that facilitates IP applications and services, especially in wireless networks. This paper demonstrates the performance...
The next generation of wireless networks will provide heterogeneous wireless technologies to a mobile user, in which they can move using terminals with multiple access interfaces and non-real-time or real-time services. The most important issue in such environment is the Always Best Connected (ABC) concept allowing the best connectivity to applications anywhere at any time. With the growing of communication...
Heterogeneous networks allow mobile nodes to take advantage of best radio facilities for their coexisting connections. Vertical handover (VHO) between them is required to perform Always Best Connected (ABC). VHO is one of the most challenging research issues for wireless networks. The traditional decision making schemes cannot meet the VHO requirements of mobile networks, and the performance may degrade...
Heterogeneous networks allow mobile nodes to take advantage of best radio facilities for their coexisting connections. Vertical handover (VHO) between them is required to perform Always Best Connected (ABC). VHO is one of the most challenging research issues for wireless networks. The traditional decision making schemes cannot meet the VHO requirements of mobile networks, and the performance may degrade...
As a widely used over-the-top (OTT) video technique, adaptive bitrate video streaming has attracted considerable research attention and efforts. Traditional bitrate adaptation schemes rely on quality of service (QoS) to assess video delivery quality. However, in this paper, we argue that QoS may not accurately reflect the user-perceived video quality, especially in time-varying wireless networks....
Video transmission over the heterogeneous networks faces many challenges due to available bandwidth, link delay, frame lost, throughput, reliability, network congestion. In video streaming it is important that the video stream must reach the users within allocated time and also without errors in video frames which leads to packet loss. Hence to avoid the packet loss and to enhance the Packet Delivery...
Transmission Control Protocol (TCP) congestion control algorithm works well for the wired networks where most of the timeouts and 3-dupacks are the result of congestion. In the wireless networks, where random segment loss due to bit errors is a dominant concern, the arrival of duplicate acknowledgements or even the retransmission timeouts do not necessarily denote congestion. In those cases, throttling...
Robust Header Compression (ROHC) is a standardized option defined by the IETF to compress the various transport and communication protocol headers over wireless links. In the present day scenario, when the applications and services are evolving to become more bandwidth hungry, wireless networks are expected to be capable of letting them drive on wireless links and provide required quality of service...
Multipath routing has been extensively employed in wireless mesh networks (WMNs) to provide network reliability and survivability, thereby, improving energy consumptions. To support the network survivability, we need to protect users' requests against network failure such as link or node failure. For each request, a primary path is set up for normal transmission, and an alternate path (protection...
In recent years, wireless networks have been utilized in many situations. However, further increase in network capacity is essential in order to transfer large volume of traffic demanded by many and various clients and applications. By introducing multi-channel environment, network capacity is increased. However, in cases that packet generation rates from wireless stations to a base station are different...
Today, the wireless communications systems have become an integral part of daily life and continue to evolve in providing better quality and user experience. One of the recent emerging wireless technologies is millimeter wave (mm-wave) technology. It is important to note that mm-wave technology has been known for many decades, but has mainly been deployed for military applications. Over the past 5–6...
Call admission control mechanisms play an important role in heterogeneous wireless networks where different radio access technologies will coexist to grant Quality of Service (QoS) in a network. They are used to decide whether or not an incoming service request will be accepted according to an admission constraint as well as determining in which radio access technology among the available it will...
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