Space-air-ground integrated network (SAGIN), as an integration of satellite systems, aerial networks, and terrestrial communications, has been becoming emerging architecture attracted intensive research interest during the past years. Besides bringing significant benefits for various practical services applications, SAGIN is also facing many unprecedented challenges due to its specific characteristics, such heterogeneity, self-organization, time-variability. Compared traditional ground or...

The emergence of in-vehicle networks, which are composed controller area network (CAN) buses and a great number ECUs, significantly reduces the difficulty vehicle designing, repairing refitting. While owing to intrinsic vulnerabilities networks increasingly rich interfaces connect outside, adversarial attacks can be easily implemented on networks. Such cause serious threats automobile security drivers' privacy. In light this, we provide in this article detailed guidance, explain basic...

Leveraging the concept of software-defined network (SDN), integration terrestrial 5G and satellite networks brings us lots benefits. The placement problem controllers gateways is fundamental importance for design such SDN-enabled integrated network, especially, reliability latency, since different schemes would produce various performances. To best our knowledge, it an entirely new problem. Toward this end, in paper, we first explore gateway to obtain minimum average latency. A simulated...

Given the highly dynamic traffic loads of mobile Internet Things (IoT) devices and their stringent quality-ofservice requirements, i.e., access delay particularly, as well heterogeneous infrastructures among IoT networks, it is a nontrivial task to efficiently deploy cloudlets large number points (APs) in especially for network reliability, since different placement schemes would produce various performances. To combat this issue, we are motivated investigate details optimal minimize average...

The MLSTIN is considered as a powerful architecture to meet the heavy consumer demand for wireless data access in coming 5G ecosystem. However, due inherent heterogeneity of MLSTIN, it challenging manage diverse physical devices large amounts traffic delivery with optimal network performance. As promoted by advantage SDN, expected be flexible paradigm dynamically provision various applications and services. In light this, cross-domain SDN that divides into satellite, aerial, terrestrial...

Device-to-device (D2D) communication, which enables two closely located users to communicate with each other without traversing the base station (BS), has become an emerging technology for network engineers optimize performance. This paper presents a framework based on stochastic geometry D2D multichannel overlaying uplink cellular networks. In this framework, part of mobile devices and machines (namely users) can upload data nearest BSs directly through channels, must their own relays then,...

The emerging SAT communication network holds great promise in various wireless access applications and services. How to achieve such integrated the best data delivery performance across multiple layers, given limited inter-layer link capacity, however, is still a challenging issue. To of our knowledge, cross-layer gateway selection problem for traffic transmission remains almost untouched, since previous works this line mainly focused on one single layer neglected other layers. Toward end,...

The satellite gateway placement problem is of fundamental significance for the design space-ground integrated network, especially network latency and reliability, since different strategies may produce various performances. In this letter, we propose two solutions solving problem, one an optimal brute force algorithm (OBFA) other a particle swarm-based optimization approximate (PSOA). Simulation results reveal that OBFA can obtain result with extremely high computational complexity, while...

With the explosive growth of various connected devices and supported services, satellite-aerial-terrestrial network (SATN) can fulfill requirements increasing data traffic with enlarged coverage enhanced capacity. In particular, utilizing multiple unmanned aerial vehicles (UAVs) as relays in SATN holds great promise for bringing lots benefits terms high flexibility reliability. However, due to limited power UAVs long distance aerial-satellite links, how improve system energy efficiency (EE)...

Leveraging unmanned aerial vehicles (UAVs) as relays, the space-air-ground integrated Internet of Things (SAG-IoT) networks can provide wireless access services to connected devices with high data rate, flexibility, and wide coverage. However, besides bringing lots benefits, SAG-IoT systems also face many challenges due mobility, unreliable satellite links, limited resources. Especially, when multiple UAVs act relays for cross-tier communication transfer collected from ground network tier...

Mobile edge computing (MEC), as an extension of the cloud paradigm to network, is a promising solution provide resource-intensive and time-critical applications mobile users. It overcomes some obstacles traditional by offering ultra-short latency less core network traffic. This paper proposes new framework based on architecture MEC deliver services edge. We introduce enumeration optimal placement algorithm (EOPA) divide-and- conquer near-optimal (DCNOPA) attain minimal data traffic...

With the continuous development of fifth-generation technology, number mobile terminal Internet Things devices has increased exponentially. How to effectively improve throughput systems become a challenge. In networks, ultra-dense networks and non-orthogonal multiple access technology have drawn extensive attention in recent years, because they can achieve multiplexing from space domain power domain. To system, this article combines with considers orthogonal frequency division access–based...

The ultra-dense low earth orbit (LEO) integrated satellite-terrestrial networks (UDLEO-ISTN) can bring lots of benefits in terms wide coverage, high capacity, and strong robustness. Meanwhile, the broadcasting open natures satellite links also reveal many challenges for transmission security protection, especially eavesdropping defence. How to efficiently take advantage LEO satellite's density ensure secure communication by leveraging physical layer with cooperation jammers deserves further...

Inter-segment gateway selection, as a critical issue for data delivery from ground segment to satellite via air network segment, is of great challenges the design space-air-ground converged networks (SAGCNs), especially transmission energy optimization due presence unreliable or lossy wireless link in network. To best our knowledge, it an entirely new problem, since existing works on selection mainly focused one single and gave no consideration other segments. It also noted that, we are...

The placement of satellite gateways, as critical devices for data transmission between terrestrial networks and satellites, is fundamental importance the design 5G-satellite hybrid networks, especially network reliability since links are prone to failing due poor meteorological conditions. To best our knowledge, this problem almost remains untouched. Existing works in line mainly focused on gateway wireless mesh sensor which have totally different topologies optimization targets, thus cannot...

As an emerging network architecture and technology, mobile edge computing (MEC) can alleviate the tension between computation-intensive applications resource-constrained devices. However, most available studies on computation offloading in MEC assume that severs host various cope with all kinds of tasks, ignoring limited resources storage capacities architecture. To make full use deployed servers, this paper, we study cross-server problem to realize collaboration among multiple servers for...

This paper analyzes the information theoretic secrecy performance in finite-area wireless networks based on a stochastic geometry framework. Unlike most prior works, which explored physical layer security with large number of transmitters, legitimate receivers and eavesdroppers infinite regions, we consider finite downlink network composing transmitter, receiver several eavesdroppers. The attempts to receive confidential data from transmitter presence We present probabilistic characteristics...

Combining mobile edge computing (MEC), the multi-drone aided space-air-ground integrated Internet of things (SAG-IoT) networks can provide ground IoT devices (GIDs) high-quality wireless access and services. However, diverse tasks, moving drones, limited network resources reveal great challenges for task offloading resource allocation scheme exploitation. Especially, given restricted computation resources, how to make full use available applications deployed on MEC servers (MECSs) compute...

As the latest evolving architecture of space networks, Internet Satellites (IoSat) is regarded as a promising paradigm in future beyond 5G and 6G wireless systems. However, due to extremely large number satellites open links, it challenging ensure communication security IoSat, especially for wiretap resisting. To best our knowledge, an entirely new problem study issue since existing works concerning physical layer (PLS) satellite networks mainly focused on space-to-terrestrial links. It also...

This article unveils the importance of statistical quality service (QoS) for resource allocation in a two-hop network. Particularly, an access point (AP) serves multiple IoT devices information transfer with assistance energy harvesting (EH) relaying. To explore maximum constant data arrival metric, we aim to maximize effective capacity (EC) under specified QoS requirements. Also, inspired policies are investigated half/full duplex (HD/FD) modes, respectively, jointly optimize power and...