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Wireless Sensor Networks (WSNs) have generated a great interest for industrial and have enabled new applications in different domains. In this paper, we present a PHY/MAC/Network analytic model for asymmetric multihop WSNs using the unslotted IEEE802.15.4 protocol and a weighted fair queuing (WFQ) scheduling that models the forwarding capability of sensors. This model can be used for cross-layer optimization...
This paper gives an insight into IEEE 802.11ac by analysing its performance in terms of system throughput taking into consideration the key features of MAC and PHY layers. Throughput at MAC layer is calculated from transmission probability, contention window and transmission stage. Likewise, the new critical attributes of 802.11ac PHY (i.e. modulation and coding schemes, spatial streams, and channel...
This paper exploits the fundamental connection between cell association and load in the sense of bits-per-joule energy efficiency. Users adopt a proposed energy- efficiency-based association reward function to associate with their base stations in a heterogeneous cellular network consisting of K independent Poisson point processes (PPPs) of base stations (BSs). We first investigate the cell association...
Device-to-device (D2D) communications can enhance the overall system capacity by reusing cellular spectrum, which at the same time leads to severe interference to cellular connections and vice versa. In practice, even when two wireless connections share the same spectrum, the interference between them may not always exist if there is no conflict at packet-level transmissions. Thus, in this paper,...
The investigation of the LTE traffic channel blocking probability is presented in this paper. It is very important problem related to the effective utilization of physical resources in multiservice LTE networks. There will be shown the key motivation of moving to the direction of introducing the dynamic signaling and traffic channel resource relocation based on user demand.
Spectrum scarcity is increasing with the growing demand of number of wireless technologies and services. Cognitive Radio (CR) techniques have become reliable solution for solving spectral congestion problem. For utilization of unused electromagnetic spectrum in a cognitive radio network, it is necessary for secondary users to monitor the available spectrum (allocated to primary users) and identify...
Cognitive Radio (CR) dynamically finds the spectrum opportunity i.e. spectrum hole in space-time-frequency and code to do its adaptive transmission without harming the incumbent or the Primary User (PU). TV white spaces (TVWS) are the unused or underutiliised bands in the UHF and VHF part of the band which according to Federal Communication Commission (FCC) can be exploited if the secondary user (SU)...
Software-defined networking (SDN) has emerged as one of the future internet technologies. It separates the control plane and the data plane, keeping the data plane simple by assigning the complex computing to the control plane. Active queue management (AQM) has been researched to obtain lower delay and higher throughput. It is noteworthy to have these advantages in SDN. To bring AQM to SDN without...
In this research, we propose the evaluation scheme of interconnection network of Network on Chip (NoC) by the approach based on probability. In this paper, we focus the multistage network for simplify, and carry out the communication performance analysis on the single flit communication. As the result, the result of flit-level simulation and probability model simulation became almost same. As future...
Physical layer capture is one of the main causes of unfairness in IEEE 802.11 Wireless LANs. While existing work have analyzed the impact of physical layer capture on the total system throughput of a cell, we analyze the unfairness among users as result of capture. Since this unfairness is related to the relative location of users, we call it as spatial unfairness. Our analysis characterizes the relative...
This paper proposes a new TDMA-based cooperative MAC scheme for a two-hop relay network in which there are several helpers besides a default relay node. Here, a helper has lower obligation than the default relay to help packet forwarding. The proposed method is developed from the existing CR-TDMA scheme, and named as opportunistic CR-TDMA or OCR-TDMA. We derive the throughput performance of CR-TDMA...
An ideal full-duplex relay doubles the achievable data rate compared to a half-duplex relay. However, in practice, the self-interference and processing delay induces an ISI channel between the source and the destination nodes. In this paper, we study the outage performance of a full-duplex relaying network with amplify-and-forward scheme. In contrast to prior work, we include the direct link from...
A Real-time Listening Based Self-adaptive Algorithm has been proposed in this paper. This algorithm is based on multi-serviced p-persistent model, it computes the collision/idle ratio according to four priorities of VANET to adjust the transmission probability with a self-adaptive strategy to enhance the channel efficiency. The algorithm improves system through reduces collision probability among...
Improved Channel Quality Indicator (CQI) reporting scheme which aims to reduce the required CQI signaling even when the downlink data activity is high by employing a CQI prediction method. According to this paper, Node B Expectations all the intermediary CQI reports between two subsequent CQI reports by utilizing a FSMC model of the wireless channel. The proposed prediction-based CQI reporting scheme...
According to emergency of wireless body area network (WBAN), the IEEE802.15.6 standard was established in Feb. 2012. A physical (PHY) layer, medium access control (MAC) layer and network layer were almost decided, however a payload in every packet is varied within [0,250] bytes. Since the low influence on human body and the low transmit power are required, the received signal to noise ratio (SNR)...
One of the common threats imposed to cognitive radio (CR) networks is referred to as primary user emulation attack (PUEA). In PUEA, some so called malicious users mimic the primary signal over the licensed frequency bands to deceive CR users to prevent them from accessing the vacant frequency. Considering smart PUEA with spectrum sensing capability, we propose a cooperative spectrum sensing scheme...
There is a growing need for a horizontal-integrated platform for machine to machine (M2M) applications. To facilitate high reusability of the various data stored on the platform, the platform's search function must be able to locate all data useful to a particular application. We refer to this cross-schema-manner search as a schema less search. We have proposed a tree-structured indexing method, called...
Mobile Stream Control Transmission Protocol (mSCTP) has been proposed to support transport layer mobility management mostly based on the radio signal strength. It could result in aggregation of mobile stations accessed via a base station with the strongest signal in the same signal overlapped area and consequently decrease the transmission probability in wireless networks. In this paper, we propose...
Much work has been done to improve the performance of video streaming over mobile data networks. The widespread adoption of HTTP/TCP for video streaming further complicates the problem as TCP's own dynamics add even more fluctuations to the already unpredictable network bandwidth. Not surprisingly, none of the existing video bit-rate selection algorithms can achieve consistent or predictable streaming...
Content-Centric Networking (CCN) focuses on content acquisition rather than end-to-end communication by decoupling content resources from special hosts. CCN does not need maintain stable paths between nodes and is independent of IP addresses, which make CCN convenient and efficient for mobile ad hoc network (MANET). In this paper, we develop an analytical model of content acquisition for Content-Centric...
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