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The article deals with the computer-aided design of the route network based on packet models. This network designed for data transmission in distributed information management system, which operates in real time. The structure and function of the system node are presented. The models for the formation and transmission of data flows are considered.
In order to improve the performance of the EDCA mechanism, an efficient collision resolution protocol must be used. To this end, many collision reduction protocols have been proposed. However, there remain still many problems. In this paper, we propose a novel multi-slot allocation protocol to resolve the collisions. The proposed protocol uses short-duration busy-tone signals to avoid collisions and...
This paper investigates the problem of maximizing uniform multicast throughput (MUMT) for multi-channel dense wireless sensor networks, where all nodes locate within one-hop transmission range and can communicate with each other on multiple orthogonal channels. This kind of networks show wide application in the real world, and maximizing uniform multicast throughput for these networks is worth deep...
The efficient allocation of multi-interface multi-channel Wireless Mesh Network channel resources is a hot topic recently. Effective channel management mechanisms need to be designed to ensure the full and efficient use of channel resources. In this paper, combined with the channel load that network buyers perceived, the channel reassignment problem of multi-interface multi-channel Wireless Mesh Network...
This paper proposes a new Reverse Direction (RD) Medium Access Control (MAC) protocol to improve the throughput and energy efficiency of IEEE 802.11 Wireless Local Area Networks (WLANs). The proposed protocol allows a source device to transmit a burst of data frames to the intended destination device in a single channel access opportunity. After the successful reception of each data frame, the destination...
In this paper, the increasing TCP performances on data loss issue over wired and wireless networks by employing TCP freeze technique is proposed. The wired and wireless networks are simulated in Network Simulation version 2 (NS-2). There are 2 transmission protocols which are TCP and UDP with the same and different packet sizes in the simulation network. For TCP, the packets are alternately transmitted...
We consider training-based channel estimation for cloud radio access networks (CRANs), in which a large amount of remote radio heads (RRHs) and users are randomly scattered over a certain service area. In this model, assigning orthogonal training sequences to all users, if possible, will cause a substantial overhead to the overall network. Instead, we introduce the notion of local orthogonality, in...
In this paper, we investigate resource optimization for energy-efficient data transmissions in a multi-cell massive multiple-input multiple-output (MIMO) system with zero-forcing (ZF) detectors. We optimize the number of active antennas per BS so as to maximize the energy efficiency (EE) of uplink data transmissions. To model the bit-per-joule EE objective, we consider throughput rate and power expenditure...
This paper presents a multichannel assignment problem in a centralized cognitive radio sensor network (CRSN). The basic aim of this problem is to maximize the overall system throughput and minimize the overall energy consumption of the CRSN. First, a weighted sum based optimization problem is formulated. Then the problem is represented using bipartite graph and solved using matching based hungarian...
In vehicle-to-infrastructure (V2I) communications, continuity and reliability are the most severe issues. Owing to the high-speed mobility of vehicles and frequent hand-off, the connection between vehicle and access point (AP) could not be kept stable. According to the number of APs and the adaptive data rate transmission, we investigate the performance of the proposed method which provides reliable...
High-speed onboard networks for the space industry with a lot of tasks that could be solved only by transmitting large data streams in a short time, with minimum overheads and accepted latencies. Particular tasks for data transmission require various types of traffic and onboard network topologies. Video data in many applications generate high throughput real-time data streams, from most demanding...
We present a novel out-of-band spectrum sensing and channel allocation scheme for frequency hopping based cognitive radio networks using genetic algorithm. Based on the optimized solution derived from GA, a set of nodes for sensing the next hopping channel and a set of nodes for transmitting data on current channel are derived. The channel allocation is performed according to individual traffic demand...
The 3rd Generation Partnership Project (3GPP) is standardizing LTE-Advanced (LTE-A) Pro. One of the technical challenges is the reduction of the uplink latency, which is larger than the downlink latency, aiming at improving the Transmission Control Protocol (TCP) throughput. A study item called Latency Reduction (LATRED) has been agreed to standardize fast uplink access schemes. The proposed solutions...
Spectrum prediction, as one enabling technique for dynamic spectrum access (DSA), has recently been received ever-increasing research attention. Most related studies (explicitly or implicitly) assume that spectrum prediction is useful for DSA. However, it does't fundamentally clear when spectrum prediction is really beneficial. To address this issue, this paper firstly provides a high-level review...
For the energy-constrained cognitive networks, it is particularly important to improve their energy efficiency (EE). We focus on the EE optimization of the continuous spectrum sensing (CSS). The EE of the secondary user (SU) networks is derived. To maximize the EE, an optimization problem is formulated under the constraints of sensing performance. After some theoretical analyses, the detailed processes...
With the data growth related to the increase of devices with network access, the high speed Ethernet is widely used in various fields from big data center to high frequency transaction (HFT). However, the conventional software-based protocol stack consumes large amount of CPU time at full transmission rate, and leads to low performance such as high latency and low throughput. This paper presents a...
In the cognitive radio networks (CRNs), efficient spectrum sensing is a key enabling techniques for the effective spectrum exploration. However, Majority of the existing works on spectrum sensing is conducted the spectrum sensing serially in cognitive radio networks, which may bring about the sensing delay problem. In this paper, in order to make full use of the available channel resources and improve...
Dynamic spectrum access technology is a kind of technology that provides a solution to the spectrum scarce problem. The most important issue in the CR network (both primary users and secondary users coexists in the network) is that the traffic of secondary users should not affect the primary users communication. In order to not affect the primary users, we have to detect the existence of the primary...
Cognitive radio (CR) network technology is widely used as a approach to the solve the scarce radio spectrum by allowing the unlicensed users to access the licensed spectrum. Since in the CR network, the licensed users are easily be affected by the introduce of the unlicensed user, we have to avoid to bring the interference to the licensed users when the unlicensed users try to transmit the data on...
Prognostics and System Health Management (PHM) has a significant influence on improving reliability and security of complex equipment, while embedded information perception and test are a major foundation for the realization of PHM. This paper proposed a novel media access control (MAC) protocol for massive wireless sensor networks which are served by the distributed antenna system (DAS). First, the...
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