In a vehicular ad hoc network (VANET), vehicles always move in high-speed which may cause the topology changes frequently. This is challenging for routing protocols of VANET. Greedy Perimeter Stateless Routing (GPSR) representative protocol However, when constructs path, GPSR selects next hop node very easily out communication range greedy forwarding, and builds path with redundancy perimeter forwarding. To solve above-mentioned problems, we proposed Maxduration-Minangle (MM-GPSR) this...

Device-to-device (D2D) communication is a promising paradigm to meet the requirement of ultra-dense, low-latency and high-rate in fifth-generation networks. However, energy consumption critical issue for D2D communication, especially relay To make best use problem optimizing efficiency (EE) must be addressed. In this paper, we propose joint power allocation selection (JPARS) scheme improvement relay-aided communications underlaying cellular network. A mixed integer nonlinear fractional...

摘要: 在分析无线传感器网络国内外研究现状及技术成熟度的基础上,从技术层面阐述了无线传感器网络与物联网之间的相互关系,总结了无线传感器网络系统执行所需要的信息采集系统设计、网络服务支持和网络通信协议设计等关键技术,说明了无线传感器网络未来发展所面临的挑战,并提出了面向物联网的无线传感器网络发展新思路。 关键词: 无线传感器网络 / 物联网 信息采集系统 网络服务支持 网络通信协议

The random placement of a large-scale sensor network in an outdoor environment often causes low coverage. In order to effectively improve the coverage wireless monitoring area, optimization algorithm for networks with Virtual Force-Lévy-embedded Grey Wolf Optimization (VFLGWO) is proposed. simulation results show that VFLGWO has better effect on rate, uniformity, and average moving distance nodes than using Lévy-embedded Optimizer, Cuckoo Search algorithm, Chaotic Particle Swarm...

Mucosa-associated lymphoid tissue (MALT) lymphoma is an extranodal low-grade non-Hodgkin that extremely rarely localises to the mediastinum. A 34-year-old female with chronic arthralgia, sicca and rash was found have a well-demarcated mediastinal cystic mass equivocal nodular enhancement within wall on chest CT during workup for Sjögren's syndrome. Subsequent 68Ga-Pentixafor-PET/CT revealed focal uptake increase capsule. The patient underwent thoracoscopic resection of lesion, pathology MALT...

Based on analyzing IoT two basic concepts,architecture of is proposed,which includes underlayer network distribution,convergence gateway access,inter-connected integration and terminal user application.In the architecture,a protocol structure given,which consists layers,network control platform application platform,and key technologies for have been discussed concerning hardware software.Six development conceptions future presented based summarizing existing problems in...

DV-Hop localization algorithm has greater error which estimates distance from an unknown node to the different anchor nodes by using estimated average size of a hop achieve location node. So improved based on correctional hop, HDCDV-Hop algorithm, is proposed. The corrects between and fractional count information relatively accurate coordinates information, it uses Differential Evolution get estimate so as further reduce error. Simulation results show that our proposed have lower higher...

Downhole microseismic data have the characteristics of low signal-to-noise ratio and high frequency, which pose a major challenge to noise attenuation. In this paper, we propose novel downhole denoising approach based on empirical wavelet transform combined with adaptive thresholding. According frequency signal, spectrum segmentation strategy is designed. It can adaptively decompose signal into different modes. Through analyzing energy modes, threshold functions are applied. The mode that...

Device-to-device (D2D) communications, as one of the promising technology for future network, allow two devices in proximity to communicate directly with each other alleviate data traffic load base station (BS). In this paper, we analysis joint relay selection and resource allocation scheme relay-aided D2D communication networks. The objective is maximize total transmission rates system while guaranteeing minimum quality service (QoS) requirements both cellular users (CUs) (DUs). We first...

Driven by the visions of Internet Things and 5G communications, mobile edge computing (MEC) as a new paradigm promises dramatic reduction in latency. In recent years, an increasing number scholars introduce D2D communication into MEC system to further reduce this letter, we propose D2D-enabled three-layer partial offloading scenario design joint optimization algorithm based on game theory (JOAGT). The proposed includes mode selection, fraction allocation, resource allocation. Simulation...

In this article, a joint cluster association and power allocation resource management scheme is proposed in D2D-NOMA-enabled heterogeneous network. The target to maximize users' long-term cumulative energy efficiency. A novel <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"><tex-math notation="LaTeX">$K$</tex-math></inline-formula> -times iteration method based on matching theory constructed handle the NOMA association, which...

Device-to-device (D2D) communication and edge caching are important technologies in the field of Internet Things (IoT), which can offload some data resource requests to network avoid repeatedly requesting same from center. However, existing strategies do not fully consider interference environment D2D lack scheme optimize user device strategy perspective delay. In this article, cumulative for links cellular is derived using stochastic geometry. Based on a more comprehensive consideration...

In WLAN fingerprint-based indoor localization, signal noise in the measurement of received strength indicator (RSSI) often results matching a set disperse reference points (RPs), leading to unsatisfactory estimation and weak robustness. To mitigate problem, we propose novel positioning strategy, torus intersection localization (TILoc), aiming improve robustness accuracy localization. online phase, design new type RSSI fingerprints by filtering out unstable access (APs). We use part robust...

One of the most challenging topics for next generation wireless networks is vertical handoff concept since several technologies are supposed to cooperate. In this letter, evolution strategy and deep Q-network (ES-DQN) has been proposed make simple effective. The algorithm executes (DQN) with objective maximizing benefit system, combined (ES) global optimization capability set initial parameters back propagation (BP) network in order improve convergence speed precision parameter learning....

With the development of Internet Things (IoT) and 5G/6G technologies, there has been significant interest in applications Vehicles (IoV) multiaccess edge computing (MEC) intelligent transportation systems. The increase number vehicles currently accessing highlighted inability some existing resource-constrained to adequately meet demands computationally intensive latency-sensitive applications. There is a challenge designing efficient task offloading strategies enhance utilization...

Vertical handoff is widely accepted as an important issue for ensuring seamless communication in heterogeneous wireless networks. This letter proposes a multi-armed bandit model-based vertical approach (MABA). First, the problem formulated problem. Then, terminal services are divided into real-time and non-real-time services, their reward functions constructed respectively. Finally, Gittins indices of networks different states calculated by state-elimination algorithm (SEA). Based on...

Leakage in the long distance pipelines may lead to severe impairment water transportation. In practice, dealing with data collected by wireless sensor networks (WSNs) is essential achieve real-time leakage localization reduce loss. More sensors improve effectiveness of monitoring pipelines. However, avoid deploying numerous which leads drill many holes pipeline install them, a novel algorithm based on compressive sensing (CS) theory proposed this paper. First, new matrix named pressure...

对于UWB定位系统而言，利用时间参数估计信号源的位置需要多个参考节点，这样增加了系统的开销。如果参考节点既能估计目标源的时间参数又能估计角度参数，理论上一个参考节点就可以确定目标源的位置。该文提出一种UWB系统TOA(到达时间)和DOA(到达角度)参数联合估计的定位方法，该方法使用矩阵束算法估计出时间参数和角度参数，进而得到目标的相对坐标。该方法通过单个接收机就可以确定目标的位置，减少了定位系统负担。仿真实验证实了该方法估计时延和角度精度较高，而且定位精度能够达到厘米级，是一种简单可行的UWB系统定位方法。

Received signal strength indicator (RSSI) of WiFi access point (AP) is a primary sensor data used for indoor fingerprint localization. User sends its online RSSI to server estimate position by matching with fingerprints database which built in the offline phase. An important goal localization increase accuracy while reduce storage cost. Meanwhile, APs perform different effects on target estimation and mapping metric In this paper, novel model based nonuniform quantization entropy (NQRELoc)...