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In this paper, a mmWave unified access and back-haul (UAB) network is presented, where both radio access (RA) and backhaul (BH) share the same millimeter wave bands. Considering uniform resource allocation of RA and BH radio resource for all pico stations, which can well mitigate the interference among pico stations, the capacity of UAB is mainly influenced by the allocated resource ratio between...
By allowing simultaneous transmissions in neighbouring cells the spectral reuse and the overall throughput of a WLAN system can be increased. We have investigated the impact of varying the clear channel assessment threshold (CCAT) in different network deployments defined by IEEE 802.11ax Task Group, and we show the potential of 4 different algorithms. By increasing the CCAT value from today's legacy...
IEEE 802.15.4 standard is designed for low power wireless personal area networks (LR-WPANs). Recently, both industry and academia are attracted to IEEE 802.15.4 because of its applicability in wireless sensor networks (WSNs) and wireless body area sensor networks (WBANs). An important feature of IEEE 802.15.4 is the very low duty cycle operation to conserve sensor node's energy. In this paper, we...
In this paper, we study the QoE-based resource allocation problem for downlink direction in LTE femtocells, considering the transport network limitation. We first formulate the problem as a convex optimization problem, which maximizes the aggregated QoE of all users and solve it using Lagrangian relaxation method. This approach provides an ideal resource allocation solution but it is not practical,...
The paper describes that when two or more tags in a wireless channel, and transmitting an identification signal to the reader, the signal will overlap, causing the reader can not normally be resolved. By comparing of the advantages and disadvantages of several anti-collision algorithm, clarify the need for anti-collision algorithm improvements.
Random access algorithm is critical for the performance of interactive broadcasting system. Random access with Dynamic Window Size and Random Access Slots(D-WS-RAS) is proposed as an efficient way to tackle this problem in the interactive broadcasting system. This algorithm is composed of three parts: utilize Bayes' rule to estimate the number of access, dynamically set backoff window size and dynamically...
The Stream Control Transmission Protocol (SCTP) is a relatively new transport protocol. It has several underlying mechanisms that are similar to the Transmission Control Protocol (TCP), as well as several improvements that are important in certain classes of applications. The timeout scheme of SCTP, however, is almost identical to that used in TCP. With dynamics of today's Internet, that timeout scheme...
Scheduling Bag-of-Tasks (BoT) applications on the cloud can be more challenging than grid and cluster environments. This is because a user may have a budgetary constraint or a deadline for executing the BoT application in order to keep the overall execution costs low. The research in this paper is motivated to investigate task scheduling on the cloud, given two hard constraints based on a user-defined...
We consider new Dynamic Network Architecture (DNA) which provides significant soft capacity in the network enabling a wide range of adaptations to traffic demand variations without any change in the fixed network infrastructure. To maximize the system throughput we propose a new second order cone programming (SOCP) based algorithm to optimize jointly the access point (AP) selection and the downlink...
Traffic demands of mobile radio network have been tremendously increasing in the recent years due to the enormous success of smartphones and their continuous feature evolution requiring higher data rates. Heterogeneous networks (HetNets) consisting of low-power small cells underlying the existing macro cells represent the preferred solution to increase the capacity of cellular systems by means of...
In this paper, we consider the impact of spectrum fragmentation along the optical single-/multi-path routing transmission on the efficiency of the elastic optical networks. Using O-OFDM multicarrier transmission as a promising technique makes it possible to choose just an adequate portion of available spectrum to satisfy the requested capacity. This involves focusing on the work to reduce the fragmentation...
We consider the class of projector-camera systems that adaptively image and illuminate a dynamic environment. Examples include adaptive front lighting in vehicles, dynamic stage performance lighting, adaptive dynamic range imaging and volumetric displays. A simulator is developed to explore the design space of such Reactive Visual Systems. Simulations are conducted to characterize system performance...
In this paper, the joint resource scheduling strategies in a full-duplex cellular system are studied. In the system, the base station (BS) is enabled full-duplex transmission, while the user equipments (UEs) are still traditional half-duplex. Firstly, we propose a binary-integer programming problem concerning cell throughput and solve it through exhaustive search algorithm. Furthermore, considering...
This paper proposes the application of a quantum inspired reinforcement learning technique for spectrum assignment of wireless communication networks. The proposed technique aims to enhance the speed of learning convergence through the dependence of the decision process on a well ranked action desirability table which is updated based on the success or failure of an action. In addition, the exploration...
Recent work has shown that adaptive CSMA algorithms can achieve throughput optimality. However, these adaptive CSMA algorithms assume a rather simplistic model for the wireless medium. Specifically, the interference is typically modelled by a conflict graph, and the channels are assumed to be static. In this work, we propose a distributed and adaptive CSMA algorithm under a more realistic signal-to-interference...
Emerging information-centric networking architectures seek to optimally utilize both bandwidth and storage for efficient content distribution. This highlights the need for joint design of traffic engineering and caching strategies. We present a systematic framework for joint dynamic interest request forwarding and dynamic cache placement and eviction, within the context of the Named Data Networking...
Due to limited transmission range and limited battery constraints of mobile nodes in Mobile Ad Hoc Network (MANET), routing in MANET becomes challenging especially when certain QoS requirements such as high data packet delivery ratio, low end to end delay and low routing overhead are to be satisfied. Even though a number of routing protocols have been proposed aiming to provide better network life...
Long Term Evolution (LTE) is an all IP packet system in which guaranteeing QoS is a real challenge. The LTE aims to provide a maximum data rates of 100Mbps for downlink and 50Mbps for uplink when 20 MHz bandwidth is used. The scheduler takes different considerations into account such as throughput and fairness when deciding the allocation of the scarce radio resources. Therefore the LTE MAC scheduler...
Long Term Evolution (LTE) is an all IP packet system in which guaranteeing QoS is a real challenge. The LTE aims to provide a maximum data rates of 100Mbps for downlink and 50Mbps for uplink when 20 MHz bandwidth is used. The scheduler takes different considerations into account such as throughput and fairness when deciding the allocation of the scarce radio resources. Therefore the LTE MAC scheduler...
This paper proposes a modified slotted random anti-collision algorithm to improve the read efficiency of anti-collision algorithm for the EPC global UHF Class-1 Generation-2 RFID standard. In this standard, the slotted random anti-collision algorithm which is a dynamic frame slotted ALOHA algorithm is specified to solve this problem. Also, the Q-algorithm with a key parameter C is adopted to dynamically...
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