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81
Research on Dynamic Virtualization Distributed Mobility Management Method for LEO Satellite Network
Published 2020-09-01“…With the commercialization of 5G,the integration of satellite communication and ground 5G has become a key research direction in the industry.Low earth orbit satellite network can cover the whole world and communicate with anyone at any time and anywhere.It is an eff ective supplement and expansion of terrestrial cellular network.Especially,the deployment of low earth orbit (LEO) internet constellation such as OneWeb and Starlink accelerates the development of LEO satellite network.However,due to the high dynamic of LEO satellite and the fast change of its network topology,the network management problem caused by it has become the diff culty of LEO satellite application,and mobility management is one of the key technologies.How to build a mobility management mechanism suitable for high dynamic LEO satellite network is an urgent problem to be solved.Based on the idea of ground distributed gateway and satellite agent cluster,the dynamic virtualization distributed mobility management (DV-DMM) model was proposed,which was mainly used to solve the problems of poor scalability and single point failure of traditional mobility management.At the same time,it used satellite to build virtual gateway to solve the problem of building satellite ground station on the ground.…”
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82
Agent Based Modeling on Organizational Dynamics of Terrorist Network
Published 2015-01-01“…The hierarchical cellular network model and the organizational dynamics model are developed for modeling the hybrid relational structure and complex operational processes, respectively. …”
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83
Perspectives on coordinated satellite-terrestrial intelligent maritime communication network
Published 2020-10-01“…With the implementation of national marine strategy,economic activities such as maritime transport,marine resource exploitation become increasingly important,and the demand for maritime communications keeps growing.Although the terrestrial cellular network had entered the 5G era,existing maritime communications still mainly rely on marine satellites and shore-based base stations,which are far from meeting the demand in terms of communication rate,delay and reliability.The future 6G networks are expected to offer satellite-air-ground-sea full coverage.However,due to complex maritime environments and heterogeneous marine services,the 6G maritime communication networks still face unique challenges.After summarizing the current developing status of maritime communications,related key technologies were surveied from three aspects:transmission efficiency,network coverage,and information service.For the future development of 6G intelligent maritime communication networks,the technical methods and research directions of maritime environment-aware intelligent transmission,coordinated satellite-terrestrial dynamic networking and service-driven resource allocation were prospected.…”
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84
Mobile Localization Based on Received Signal Strength and Pearson's Correlation Coefficient
Published 2015-08-01“…Being applicable for almost every scenario, mobile localization based on cellular network has gained increasing interest in recent years. …”
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85
Design and Construct a Forest Fire Detection and Control System.
Published 2025“…For the system to be functional, the availability of cellular network coverage is required in the forest to enable short message services to take place. …”
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86
Cooperative content downloading scheme based on D2D multicast communications
Published 2020-11-01“…Aiming at the content downloading scenario in the network such as cellular network and vehicular network,a cooperative content downloading scheme based on device-to-device multicast communications was proposed to improve the content downloading performance.Such a scheme took advantage of the proximity feature of the content requesters and groups them into disjoint clusters.Firstly,the base station delivered the entire content to a cluster,and each content requester in a cluster downloaded a proportion of the entire content.Then,the content requesters took turns sharing their downloaded content with other content requesters in the same cluster.In this way,the additional resource consumption of content sharing in a cluster was shared by the content requesters in the cluster together.During this process,a pricing-based approach was proposed to motivate these content requesters to cooperate with each other.Such an approach only required the base station to maintain a content downloading price.Based on this,the joint issue of user clustering,link scheduling and power allocation was studied to minimize the total cost of content requesters.To obtain a superior solution with reductive complexity,a joint optimization algorithm was designed based on the coalition formation game.Numerical results show that compared with the traditional non-cooperative scheme,the total cost of content requesters was reduced by 37.15%.Under different numbers of content requesters and cellular users,the proposed scheme is both superior to other benchmark schemes.…”
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87
Survey of software defined D2D and V2X communication
Published 2019-04-01“…The related D2D (device-to-device) and V2X (vehicle-to-everything) are regarded as vital components of 5G communication system,which providing alternative network services and multiple application services for cellular network.In the meanwhile,SDN (software defined networking) can improve the compatibilities and flexibilities of D2D and V2X.SD-D2D (software defined D2D communication) and SD-V2X (software defined V2X communication) technologies were reviewed.Based on their similarities and respective characteristics,their state-of-arts and architectures were reviewed accordingly,and the key technologies such as D2D location/discovery management,D2D routing control,D2D flow table management,V2V path scheduling,and V2V path recovery were analyzed.Finally,it was pointed out that the SD-D2D architecture was approaching mature and the SD-V2X framework had been preliminarily determined,the existing problems of interference management,mobile management and routing management in D2D/V2X communication could be effectively solved.Furthermore,it was also pointed out that the disconnection between the existing SD-D2D/V2X studies and the actual application needed to be overcome.…”
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88
Physical layer security of full-duplex relay-assisted D2D networks under outdated CSI
Published 2023-03-01“…The relay aided device to device (D2D) network can improve the spectrum efficiency of D2D users and the physical layer security of cellular user (CU) by sharing spectrum with the cellular network.To further improve their performance, transmit antenna selection can be used at the base station and the relay node of the D2D link, and full duplex technology can be used in the relay node.However, due to the feedback delay and mobility, the channel state information (CSI) used for the antenna selection of cellular link and all D2D links may be outdated.For the physical layer security and reliability in the above scenario, security model of a full duplex relay aided D2D network was proposed in the presence of active eavesdropping and outdated CSI, in which the base station and relay nodes both used transmit antenna selection.The closed-expressions for outage probability, ergodic capacity, probability of non-zero secrecy capacity, secure outage probability, asymptotic secure outage probability of relay aided D2D networks were derived.The numerical calculation and simulation results show that the more the number of base station transmit antennas and relay jamming antennas are, the better the CU security performance is.The outdated CSI will deteriorate the outage and security performance of CU.…”
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89
Physical layer security of modify-and-forward cooperative D2D networks based on transmit antenna selection
Published 2024-04-01“…To further improve the physical layer security (PLS) performance of decode-and-forward (DF) cooperative device-to-device (D2D) network that shared spectrum resources with cellular network, a modify-and-forward (MF) cooperative D2D-cellular PLS model was proposed which the D2D transmitter adopted transmit antenna selection (TAS). …”
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90
Research on incentive mechanism for IoT based on mobile hotspot sharing
Published 2019-03-01“…Many devices in the Internet of things,especially energy-constrained sensor devices,often lack efficient network connectivity.If the networking method based on mobile hotspot sharing is adopted,large-area network coverage can be realized efficiently.The basic idea of the networking mode is to activate some mobile node in the cellular network (such as the holders of smart phones and other smart devices) to open mobile hotspot,provide Wi-Fi connections for resource-constrained node,and satisfy the communication needs of these node,so as to achieve efficient access to the mobile Internet.In this networking mode,how to encourage mobile users to contribute hotspot is the key.The incentive mechanism in mobile hotspot sharing network and the impact on network performance was studied mainly,and a novel incentive mechanism was designed to enable some users to obtain certain benefits by contributing Wi-Fi hotspot.Firstly,the optimal sharing decision of different types of users under the incentive mechanism and the influence of decision-making among different users were studied.Then,the evolution of user behavior,the overall state of the network with time and the equilibrium state of the system were analyzed.The simulation results show that under the equilibrium state of the system,the number of mobile hotspot contributors increases with the increase of free traffic ratio,which also leads to an increase in the number of hotspot.If the price of unit traffic is too high,the number of users will be reduced,which is not conducive to the operation of the network.In addition,compared with the non-hotspot sharing network,if the mobile hotspot sharing networking mode is adopted,the network performance can be increased by up to 148%.…”
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91
Multiband Patch Antenna for Femtocell Application
Published 2014-01-01“…Distributed antenna solution (DAS) has been introduced in cellular network to achieve homogenous indoor coverage. …”
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92
Enabling LTE and WiFi Coexisting in 5 GHz for Efficient Spectrum Utilization
Published 2017-01-01“…Due to the increasing mobile traffic demands in cellular network, researchers have proposed the coexistence of LTE and WiFi technologies in 5 GHz unlicensed bands. …”
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93
Optimal transmission for scalable video coded streaming in cellular wireless networks with the cooperation of local peer-to-peer network
Published 2017-04-01“…We study the problem of transmitting scalable video coded streams in a hybrid scenario including a global cellular network and a local peer-to-peer network. Given desirable channel condition in cellular downlink, some cellular user equipments can fetch the video chunks via the cellular base station directly, and also provide relay service via the local peer-to-peer network for other user equipments unable to meet their basic video quality. …”
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94
Performance Analysis of 3D Massive MIMO Cellular Systems with Collaborative Base Station
Published 2014-01-01“…Massive MIMO have drawn considerable attention as they enable significant capacity and coverage improvement in wireless cellular network. However, pilot contamination is a great challenge in massive MIMO systems. …”
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95
A Fluid Model for Mobile Data Offloading Based on Device-to-Device Communications with Time Constraints
Published 2024-12-01“…Proximity-based content sharing between nearby devices in cellular networks using device-to-device (D2D) communications—without routing through the base station—has emerged as a promising solution for offloading traffic from the core cellular network and reducing network congestion, especially when the users requesting content can tolerate some delay before receiving it. …”
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96
Refining Sparse Cell-ID Trajectory of Public Service Vehicles by Spatiotemporal Modelling
Published 2021-01-01“…The approach was finally tested using Beijing cellular network signaling datasets. The precision of PSV trajectory detection is 90%, and the recall is 88%. …”
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97
APG mergence and topological potential optimization based heuristic user association strategy
Published 2022-06-01“…This coordination can break the performance bottleneck of traditional cellular network caused by inter-cell interference. However, it needs significant amounts information interaction and signal processing, which results in poor scalability. …”
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98
Key techniques of cognitive convergence networks
Published 2014-06-01“…Concentrating on the development of heterogeneous cellular networks and cognitive radio networks, the cogni-tive cellular networks, femtocell and WiFi 2.0 networks were firstly summarized, respectively. …”
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99
Tractable yet effective approximation to directional antenna array for millimeter-wave networks
Published 2018-12-01“…The complexity of the actual antenna pattern imposes restrictions on investigating the benefits of directional antenna arrays in large-scale networks.Hence,a novel multi-level flat-top antenna pattern was proposed to approximate and simplify the actual one and was applied in millimeter-wave cellular networks for performance analysis.To fully characterize the impact of the directional antenna array on the user performance,stochastic geometry was adopted to establish an analytical framework for millimeter-wave cellular networks and derive the coverage probability and transmission rate of the typical user with the proposed multi-level flat-top antenna pattern,including the exact and bounding expressions.The simulation results show that the proposed antenna pattern provides a better tradeoff between the accuracy and tractability than previous patterns.…”
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100
