Analysis of 5G Cellular Network Architecture by Fengyi Yang, Jianmin Zhang, Weiliang Xie, Min Wang, Haining Wang

“…In order to satisfy the various requirements of future network services，5G system should not only broaden the spectrum bandwidth and improve the spectrum efficiency through exploiting new technologies，but also need a novel wireless network architecture. Therefore，the key features of 5G cellular network architecture based on the demands of future network were analyzed and concluded. …”
Get full text

Continuous Skyline Queries Based on MapReduce by Guanmin Shan, Yihong Dong, Xianmang He

“…With the development of Web and wireless sensor networks, the appearance of big data has brought a great challenge to data query and process. …”
Get full text

Security monitoring system of intelligent substation based on IoT by Yeshen HE, Kun LIANG, Wei TAN, Xin HU

“…,in the intelligent substation,a scene awareness mechanism was established under the mixed conditions to intelligent functions,such as the smart sensing of substation environment,infrastructure support,personnel exchanges,abnormal conditions judgments and other factors,and the multi-dimensional depth perception was realized.Meanwhile,interoperability of the perception network,the establishment of intelligent substation security monitoring system could be achieved by using wired and wireless fusion of multi-state communication technology.The system can multi-dimensionally perceive and monitoring the security of substation environment,which effectively enhances the smart substation intelligent monitoring level to ensure safe and stable operation of the substation.…”
Get full text

Overview of reconfigurable intelligent surface for new-generation mobile communication by Zilu GAO, Shaohui SUN, Li LI

“…Reconfigurable intelligent surface technology, which features low cost, low energy consumption and easy deployment, is the potential key technology of 6G.By intelligently regulating electromagnetic waves in space, RIS can assist in building an intelligent and controllable wireless electromagnetic environment, thus providing a new paradigm for the development of mobile communications.Firstly, the basic principle, main technology advantages and application scenarios were analyzed.Then, the key technologies such as channel estimation and beamforming in RIS aided communication transmission were discussed, and relevant research suggestions were given.Finally, the main challenges of RIS technology in practical application were analyzed from the aspects of hardware implementation, algorithm design and network deployment.…”
Get full text

Power Efficient Load Balancing Algorithm in LTE-A Heterogenous Network Based on Assignment Model by Kai Liu, Jianye Zhao, Zhimin Liu

“…Energy consumption of wireless network is receiving more and more attention and has become one of key aspects of 5G while few researches on heterogeneous network （HetNet）load balancing focused in power consumption. …”
Get full text

Challenge and strategy of 5G radio optimization by Jun ZHOU, Xiao QUAN, Jianhui MA

“…The era of network convergence,terminal and business diversification in 5G stage is coming.The radio network will have the situation of coexistence of GSM/TDD/FDD/NB/pre5G/5G/WLAN multi-mode and 900 MHz/1 800 MHz/ F/D/E/A6-band 15 frequency points.Due to the layered service carrying,the existing 4G and 5G interact with each other,which needs to be taken into account.The network structure will be unprecedented complex,and the wireless optimization work situation will be severe.The difficulties and challenges of 5G radio optimization were analyzed,and the strategies to deal with 5G radio optimization was put forward.…”
Get full text

Research on Ev-Do Multi-Carrier Coverage Consistency Control by Baofa Hu, Minghui Lin, Wen Chen

“…In the crowded area，China Telecom cdma2000 Ev-Do sector is configured with multi-carrier for improving the capacity.Nevertheless，the users’ experience is influenced because of the carrier’s effective coverage difference.Meanwhile，the traditional optimization methods for multi-carrier coverage such as performance index analysis and drive test are time-consuming and costly.According to the multi-carrier wireless environment typical model and combining with the DRC and call data analysis，an effective method to control the coverage of each carrier was proposed.This method can improve the optimization efficiency of China Telecom cdma2000 network by transforming the empirical method into quantitative strategy.…”
Get full text

Architecture to connect sensor networks with Internet and services provided by SUN Ji-min1, SHEN Yu-long2, SUN Yu3, ZHANG Si-dong1

“…Connecting wireless sensor networks （WSN） with Internet and providing effective services to the Internet us-ers are the heated research issues. …”
Get full text

Smart Internet of things aided by“terminal-edge-cloud” cooperation by Dapeng WU, Puning ZHANG, Ruyan WANG

“…The further expansion of the Internet of things (IoT) traffic and the explosive growth of the terminal data require higher delay performance and computing ability of the access network.The traditional wireless network architecture has been unable to support the rapid development of IoT.Thus,the edge-driven smart IoT architecture was proposed.Firstly,the main factors that restrict the development of IoT were analyzed,and then the edge computing technology was introduced into the IoT to form a “terminal-edge-cloud” cooperative computing architecture to deal with the traffic data efficiently and timely.Finally,the challenges of the edge-driven smart IoT were analyzed and the future work of this system was proposed.…”
Get full text

Warehouse mobile access network security associate pre-anticipated notification scheme based on AAA authentication by Yong-hui ZHANG, Zhang-xi LIN, Jian-hua LIU, Quan LIANG

“…A security pre-anticipated notification scheme was proposed for network mobility,based on AAA authentication.Pre-judged handover by wireless sensor network locating,security association information context was triggered to forward to data processing center in corresponding node router,in order to achieve trust authentication in advance.The scheme models on Pi calculus proved its compatibility with NEMO basic protocol.Analysis results display that costs become the half and simulations results show delay and resource occupied reduces significantly.…”
Get full text

Improving Rare Events Detection in WSN through Cluster-Based Power Control Mechanism by Zakia Jellali, Leïla Najjar Atallah, Sofiane Cherif

“…Rare events detection is one of the main applications in Wireless Sensor Networks (WSN) and is currently a central concern of a vast literature. …”
Get full text

A Comprehensive Approach to Power Management in Embedded Systems by Antônio Augusto Fröhlich

“…These mechanisms are illustrated and evaluated using realistic wireless sensor network cases that sustain comparisons with other proposals at each of the considered levels. …”
Get full text

MAC protocols in ultra-wide band system by YUE Ran1, ZHANG Qin-yu2, ZHANG Nai-tong1, ZHENG Shi2

“…Recently,the ultra-wide band （UWB）-based technique is focused on more deeply along with the design of MAC （media access control） for its advantages.Comparing with the conventional wireless communication system,the UWB system has its unique characteristics,higher speed rate,lower PSD （power spectrum density）,etc.It is therefore necessary to propose advanced MAC protocols for matching the requirements of the system.In this study,the performance of various types of MAC protocols based on UWB system is investigated.The physical structures for different MAC protocols are compared.Some special demands from UWB for MAC are analyzed.The advanced design for the MAC protocols in UWB is proposed.It may provide the implementation base for future MAC protocols.…”
Get full text

Indoor localization algorithm based on RFID technology for smart park by Wenzhao WU, Xiao WANG, Kunpeng ZHAO, Yafeng WEN

“…To meet the various requirements of full range management of vast device in buildings of smart park，an indoor localization algorithm about information fusion of multi readers was proposed.Based on device management in RFID system，using the wireless sensing characteristics between the reader and the tag，and combining with the reference tag concept，an indoor localization algorithm based on RFID was proposed.The algorithm had the characteristic of high position accuracy，low complexity and low cost.This algorithm could realize the localization of device tag in smart buildings，and realize management to a large number of device in buildings of smart park more efficiently and intelligently.…”
Get full text

Optimal Relay Selection Strategy in Cognitive Cooperative Relaying Network by Yinshan Liu, Xiaofeng Zhong, Jing Wang

“…Cognitive cooperative relaying communication significantly improves the performance of wireless communication networks and spectral efficiency.Optimal relay selection problem,which characterize the desired tradeoff between the probing cost for establishing cooperative transmission and hence higher reward via cooperative diversity,is a hard issue when the number of relay nodes is large.Optimal relay selection strategy was established by using optimal stopping theory with a finite horizon.Furthermore,a pure SNR（signal-to-noise ratio）threshold structure was exhibited.Theoretical analysis and numerical results indicate that proposed optimal relay selection strategy is effective in reducing the number of probing candidate relays and improving the reward of source.…”
Get full text

Research of 5G NR RedCap technology by Hanyang LI, Weiwen WENG, Nan LI, Long ZHANG, Jinxia CHENG

“…Faced to industrial wireless sensors, video surveillance, wearable devices, RedCap UE (reduced-capability user equipment) was proposed in 3GPP Release 17 (Rel-17), which could greatly reduce the costs of UE under the premise of satisfying the requirements of these use cases.Firstly, the standardization progress of 5G RedCap was introduced.Then, typical use cases of 5G RedCap technology were analyzed.After that, deep research was carried on the complexity reduction characteristics as well as the related gains brought by RedCap technology from two aspects of UE optimization and network performance improvement.Finally, the development potential and the evolution direction in the future were summarized.…”
Get full text

Research on Basic Theory and Key Technology of Cognitive Radio Network by Ping Zhang, Jianwu Li, Zhiyong Feng, Qixun Zhang

“…Cognitive radio network（CRN）is a cognitive process of network，which makes planning，decision and response for network state through learning and analysis of the network environment.CRN is one of the effective ways to solve the limited network capacity，and to satisfy the national strategic demand on the frequency spectrum efficient-utilization and the integration of heterogeneous networks.As the key technology of 5G，CRN indicates the direction for the future development of wireless communication network.The system architecture for cognitive radio networks，the basic theory research，the key technologies of implementation were introduced，and the demonstration platform of CRN was presented.…”
Get full text

Coordinated beamforming algorithm assisted by receive beamforming vector estimation by Ying HUANG, Gang-ming LV, Shi-hua ZHU

“…A distributed coordinated beamforming optimization scheme with the assistance of receive beamformer esti-mation was proposed for downlink cellular wireless communication systems. By sharing a small amount of information among cooperated base stations(BSs), the proposed algorithm estimates the receive vectors of related users at the BSs based on MVDR criterion, which are then utilized to optimize the design of transmit beamforming vectors. …”
Get full text

Minimized Low-Profile Wideband Antennas Using High Impedance Surface by Yizhu Shen

“…This paper proposes minimized low-profile wideband antenna by employing high impedance surface (HIS), for wireless application scenarios at radio frequency, microwave, and even terahertz. …”
Get full text

Packet size adjustment strategy for fairness in multi-rate and multi-node IEEE 802.11 by XU Wei-qiang1, HU Si-ping1, WANG Ya-ming1, ZHANG Yun-hua1

“…After deeply analyzing the reasons of the unfairness in the multi-rate mechanism,the new strategy,transmission rate-based packet size adjustment（TRPSA） was provided.This strategy guaranteed that each node with different transmit rate could access the wireless channel fairly.The theoretic proof and the extensive simulation validation show that the proposed strategy can achieve the efficient fairness and improve the network performance under the multi-rate multi-node situation.The proposed strategy slightly modifies IEEE 802.11.Thus,it is easy to be implemented and widely applied in the practical network.…”
Get full text