A5024671117- Wireless Networks and Protocols
- Software-Defined Networks and 5G
- Energy Efficient Wireless Sensor Networks
- Mobile Ad Hoc Networks
- Opportunistic and Delay-Tolerant Networks
- Caching and Content Delivery
- Advanced Optical Network Technologies
- Energy Harvesting in Wireless Networks
- Advanced MIMO Systems Optimization
- Indoor and Outdoor Localization Technologies
- Network Time Synchronization Technologies
- IoT Networks and Protocols
- Network Traffic and Congestion Control
- Interconnection Networks and Systems
- Cooperative Communication and Network Coding
- Cloud Computing and Resource Management
- Logic, Reasoning, and Knowledge
- Network Security and Intrusion Detection
- Multi-Agent Systems and Negotiation
- Advanced Wireless Network Optimization
- Bayesian Modeling and Causal Inference
- Network Packet Processing and Optimization
- Sustainability and Ecological Systems Analysis
- Millimeter-Wave Propagation and Modeling
- Bluetooth and Wireless Communication Technologies
PLA Information Engineering University
2020-2024
Wuhan Ship Development & Design Institute
2024
Beijing Jiaotong University
2020
Foshan University
2019
University of Antwerp
2016-2019
Xiamen University
2011-2016
iMinds
2016
North University of China
2016
Beijing University of Civil Engineering and Architecture
2015
Délégation Centre Limousin Poitou-Charentes
2013
IEEE 802.11ah is a new Wi-Fi draft for sub-1Ghz communications, aiming to address the major challenges of Internet Things (IoT): connectivity among large number power-constrained stations deployed over wide area. The Restricted Access Window (RAW) mechanism promises increase throughput and energy efficiency by dividing into different RAW groups. Only in same group can access channel simultaneously, which reduces collision probability dense scenarios. However, does not specify any grouping...
IEEE 802.11ah or HaLow is a new Wi-Fi standard for sub-1Ghz communications, aiming to address the major challenges of Internet Things: connectivity among large number power-constrained stations deployed over wide area. Existing research on performance evaluation generally based analytical models, which does not accurately represent real network dynamics and hard adjust different conditions. To this hiatus, we implemented physical MAC layer in ns-3 simulator, which, compared more closely...
So far, existing sub-GHz wireless communication technologies focused on low-bandwidth, long-range with large numbers of constrained devices. Although these characteristics are fine for many Internet Things (IoT) applications, more demanding application requirements could not be met and legacy such as Transmission Control Protocol/Internet Protocol (TCP/IP) used. This has changed the advent new IEEE 802.11ah Wi-Fi standard, which is much suitable reliable bidirectional high-throughput...
IEEE 802.11ah, marketed as Wi-Fi HaLow, extends to the sub-1 GHz spectrum. Through a number of physical layer (PHY) and media access control (MAC) optimizations, it aims bring greatly increased range, energy-efficiency, scalability. This makes 802.11ah perfect candidate for providing connectivity Internet Things (IoT) devices. One these new features, referred Restricted Access Window (RAW), focuses on improving scalability in highly dense deployments. RAW divides stations into groups reduces...
As an important part of intrusion detection, feature selection plays a significant role in improving the performance detection. Krill herd (KH) algorithm is efficient swarm intelligence with excellent data mining. To solve problem low efficiency and high false positive rate detection caused by increasing high-dimensional data, improved krill based on linear nearest neighbor lasso step (LNNLS-KH) proposed for network The number selected features classification accuracy are introduced into...
IEEE 802.11ah, marketed as Wi-Fi HaLow, is a new standard for sub-1Ghz communications, aiming to address the major challenges of Internet Things (IoT), namely connectivity among large number densely deployed power-constrained stations. The was only published in May 2017 and hardware supporting HaLow not available on market yet. As such, research 802.11ah has been mostly based mathematical simulation models. Mathematical models generally introduce several simplifications assumptions, which do...
IEEE 802.11ah is the new sub-1 GHz Wi-Fi standard, targeting large-scale and dense deployments of low-power stations. One its major improvements compared to previous 802.11 standards, ability scale thousands stations per access point. Cost-effective evaluation at such a only possible using simulation, which requires realistic path loss models hardware parameters. In this paper, we evaluate seven models, based on large sub-urban measurement campaign, including macro line-of- sight (LoS), pico...
The new medium access method of IEEE 802.11ah, called Restricted Access Window (RAW), divides stations into different groups, and only allows in the same group to channel simultaneously, order reduce collisions thus achieve better performance (e.g., throughput).However, existing station grouping strategies support homogeneous scenarios where all use modulation coding scheme (MCS) packet size.A surrogate model is an efficient mathematical that represents behavior a complex system, trained...
The Restricted Access Window (RAW) mechanism proposed by IEEE 802.11ah promises to address one of the major problems Internet Things (IoT): high channel contention in large-scale densely deployed sensor networks. RAW feature allows Point (AP) divide stations into different groups, with only same group being allowed access simultaneously. Existing station grouping strategies support homogeneous scenarios, where all have fixed data transmission interval, modulation and coding scheme (MCS)...
Minimizing the energy consumption is one of main challenges in internet things (IoT) networks. Recently, IEEE 802.11ah standard has been released as a new low-power Wi-Fi solution. It several features, such restricted access window (RAW) and target wake time (TWT), that promise to improve consumption. Specifically, this article we study how reduce thanks RAW TWT. In order do this, first present an analytical model calculates average during slot. We compare these results simulator have...
The restricted access window (RAW) feature of IEEE 802.11ah aims to significantly reduce channel contention in ultra-dense and large-scale sensor networks. It divides stations into groups slots, allowing only one RAW slot at a time. Several algorithms have been proposed optimize the parameters (e.g., number group duration, station assignment), as optimal parameter values affect performance depend on network traffic conditions. These often rely accurate estimation future traffic. In this...
Wi-Fi HaLow is an adaptation of the widespread technology for Internet Things scenarios. Such scenarios often involve numerous wireless stations connected to a shared channel, and contention channel significantly affects performance in such networks. contains solutions aimed at handling between stations, two which, namely, Centralized Authentication Control (CAC) Distributed (DAC), address reduction during link set-up process. The process special because access point knows nothing connecting...
Small satellite constellations are an attractive alternative to provide ubiquitous connectivity Internet of Things (IoT) and 5G machine-type communication (MTC) applications in areas where terrestrial network coverage is limited. In order global using small networks flying low earth orbit (LEO), a large constellation at least hundreds satellites needed. As LEO can only connect directly the ground station (GES) sporadically, they need forward data over inter-satellite links (ISLs) reach GES....
The robustness of complex networks plays an important role in human society. By further observing the on our planet, researchers find that many real systems are interdependent. For example, power rely Internet to transfer operation information, predators have hunt for herbivores refuel themselves, etc. Previous theoretical studies indicate removing a small fraction nodes interdependent leads thorough disruption networks. However, due heterogeneous weak inter-layer links, world not so fragile...
The traffic scheduling mechanism in Time-Sensitive Networking (TSN) is the key to guaranteeing deterministic transmission of traffic. However, when time-sensitive and non-time-sensitive are transmitted together, conflicts easy occur TSN. As a result, will be disrupted, may preempted for long time. To optimize performance multi-type hybrid TSN, we firstly establish collaborative framework that incorporates Time Aware Shaping (TAS) Cyclic Queuing Forwarding (CQF) mechanisms. We then design...
Many data aggregation schemes based on kinds of clusters have been proposed for reducing energy cost in WSN by leveraging the correlation or redundancy among sensor nodes. But most clustering protocols are k-hops neighbors spite distribution over neighbor When cluster head is selected as representative node all member nodes to report aggregated sink, there may be significant errors due fluctuating within cluster. In this paper, we propose a data-aggregation with and aware (DEDAC) which...
IEEE 802.11ah is a new Wi-Fi standard operating on unlicensed sub-GHz frequencies. It aims to provide long-range connectivity Internet of Things (IoT) devices. The restricted access window (RAW) mechanism promises increase throughput and energy efficiency in dense deployments by dividing stations into different RAW groups allowing only one group the channel at time. In this demo, we demonstrate ability support large number densely deployed IoT with heterogeneous traffic requirements....
“Bottleneck Nodes” are those connecting two or more areas alone with the reason of deployment. Compared to other nodes, this kind nodes important lifetime whole network. How find these is a problem about how minimum cut set in graph theory, and difficult implement distributed way. In paper, new named “quasi-Bottleneck which have similar effect on performance wireless sensor network can be found out much easily introduced. Theoretical analysis extensive simulation show that significant impact...
Communication is an important resource for multiagent coordination. Interactive Dynamic Influence Diagrams (I-DIDs) have been used extensively in planning when there uncertainty, and they are recognized graphical representations of Partially Observable Markov Decision Processes (I-POMDPs). We establish a communication model among multiple agents based on the I-DID framework. use AND-communication method by assuming separate action phase each step, rather than replacing domain actions, order...