scholarly journals A Spatial Group-Based Multi-User Full-Duplex OFDMA MAC Protocol for the Next-Generation WLAN

Sensors ◽  
2020 ◽  
Vol 20 (14) ◽  
pp. 3826
Author(s):  
Meiping Peng ◽  
Bo Li ◽  
Zhongjiang Yan ◽  
Mao Yang
Keyword(s):  
Multiple Access ◽  
Wireless Local Area Network ◽  
Local Area Network ◽  
Mac Protocol ◽  
High Density ◽  
Full Duplex ◽  
System Throughput ◽  
Area Network ◽  
Next Generation ◽  
Simulation Results

The Wireless Local Area Network (WLAN) has become a dominant piece of technology to carry wireless traffic for Internet of Things (IoT). The next-generation high-density WLAN scenario is very suitable for the development trend of the industrial wireless sensor network. However, in the high-density deployed WLAN scenarios, the access efficiency is low due to severe collisions, and the interference is diffused due to the scattered locations of the parallel access stations (STAs), which results in low area throughput, i.e., low spatial reuse gain. A spatial group-based multi-user full-duplex orthogonal frequency division multiple access (OFDMA) (GFDO) multiple access control (MAC) protocol is proposed. Firstly, the STAs in the network are divided into several spatial groups according to the neighbor channel sensing ability. Secondly, a two-level buffer state report (BSR) information collection mechanism based on P-probability is designed. Initially, intra-group STAs report their BSR information to the group header using low transmission power. After that, group headers report both their BSR information collected from their members and inter-group interference information to the access point (AP). Finally, AP schedules two spatial groups without mutual interference to carry on multi-user full duplex transmission on the subchannels in cascading mode. The closed-form formulas are theoretically derived, including the number of uplink STAs successfully collected by AP, the network throughput and area throughput under saturated traffic. The simulation results show that the theoretical analysis coincide with the simulation results. The system throughput of the GFDO protocol is 16.8% higher than that of EnFD-OMAX protocol.

scholarly journals OFDMA Based QoS-Oriented Guarantee Novelty Multiple Access Protocol

2018 ◽  
Vol 36 (3) ◽  
pp. 543-549
Author(s):  
Run Zhou ◽  
Bo Li ◽  
Mao Yang ◽  
Zhongjiang Yan
Keyword(s):  
Multiple Access ◽  
Wireless Local Area Network ◽  
Local Area Network ◽  
Mac Protocol ◽  
Scheduling Algorithm ◽  
Media Access Control ◽  
Proportional Fairness ◽  
Area Network ◽  
Next Generation ◽  
The Next Generation Wlan

The next generation wireless local area network (WLAN) 802.11ax standards committee takes high quality of service(QoS) guarantee as one of important technology goals of the next generation WLAN. As a result of a variety of wireless traffics, so the requirements of the QoS must also be varied. However, the existing media access control(MAC) protocol based on orthogonal frequency division multiple access(OFDMA) can’t support QoS diversification and high requirement well. To solve this problem, this paper presents a QoS-oriented OFDMA MAC for the next generation WLAN. On one hand, for backward compatibility consideration, continue to use four priority traffics of 802.11e in this protocol; on the other hand, the introduction of QoS-oriented priority scheduling algorithm to support future wireless traffic feature which is QoS of diversification and high requirements. Finally, through the simulation, the system effective throughput of the proposed QoS-OFDMA MAC is 57.8% and 59% higher than the OFDMA MAC of the sequential scheduling algorithm and the OFDMA MAC of the proportional fairness algorithm.

scholarly journals In-Band Full Duplex Wireless LANs: Medium Access Control Protocols, Design Issues and Their Challenges

Information ◽  
2020 ◽  
Vol 11 (4) ◽  
pp. 216
Author(s):  
Md. Ruhul Amin ◽  
Md. Shohrab Hossain ◽  
Mohammed Atiquzzaman
Keyword(s):  
Access Control ◽  
Medium Access Control ◽  
Wireless Local Area Network ◽  
Local Area Network ◽  
Mac Protocol ◽  
Mac Protocols ◽  
Full Duplex ◽  
Area Network ◽  
Medium Access ◽  
Wireless Medium

In-band full duplex wireless medium access control (MAC) protocol is essential in order to enable higher layers of the protocol stack to exploit the maximum benefits from physical layer full duplex technology. Unlike half duplex wireless local area network, a full duplex MAC protocol has to deal with several unique issues and challenges that arise because of the dynamic nature of the wireless environment. In this paper, we have discussed several existing full duplex MAC protocols and have shown qualitative comparisons among these full duplex MAC protocols. Full duplex in-band wireless communication has the potential to double the capacity of wireless network. Inter-client Interference (ICI) is a hindrance in achieving double spectral efficiency of the in-band full-duplex wireless medium. In this paper, we have classified existing solutions to the ICI problem and compared the solutions with respect to the proposed approaches, their advantages and disadvantages.We have also identified and discussed several issues and challenges of designing a full duplex MAC protocol. Results of qualitative comparisons of various wireless full duplex MAC protocols may be applied to design new protocols as well as researchers may find the identified issues and challenges helpful to solve various problems of a full duplex MAC protocol.

scholarly journals Spatial Clustering Group Based OFDMA Access Protocol for the Next Generation WLAN

2018 ◽  
Vol 36 (5) ◽  
pp. 897-903
Author(s):  
Yong Li ◽  
Bo Li ◽  
Mao Yang ◽  
Zhongjiang Yan ◽  
Qiao Qu
Keyword(s):  
Theoretical Analysis ◽  
Multiple Access ◽  
Local Area Network ◽  
Spatial Clustering ◽  
Area Network ◽  
Next Generation ◽  
Access Protocol ◽  
Access Channel ◽  
Simulation Results ◽  
The Next Generation Wlan

The next generation wireless local area network (WLAN) needs to significantly improve the area throughput in high dense scenario. Orthogonal Frequency Division Multiple Access (OFDMA), considered as the key technology of next generation WLAN, has been adopted by next generation WLAN communication standard. However, the existing studies on the OFDMA protocol have the interference extensions problem, i.e. multiple users are located in the dispersive area, and then the geographical interference area is enlarged. In this paper, a spatial clustering group based OFDMA multiple access protocol (SCG-OFDMA) is proposed. SCG-OFDMA enables the users in close area to form spatial clustering groups dynamically, then the users in the spatial clustering group access channel and transmit data by OFDMA. It reduces the geographical interference area, and enhances the area throughput. The theoretical analysis of SCG-OFDMA is also carried out. The simulation results of SCG-OFDMA are in agreement with the theoretical analysis. Simulation results show that the area throughput of SCG-OFDMA is higher than existing OFDMA protocol and distributing coordination function by 15.98% and 31.26% respectively. It provides a reference to design media access control protocol of the next generation WLAN.

Novel dual-band multistrip monopole antenna with defected ground structure for WLAN/IMT/BLUETOOTH/WIMAX applications

2013 ◽  
Vol 6 (1) ◽  
pp. 93-100 ◽  
Author(s):  
Jaswinder Kaur ◽  
Rajesh Khanna ◽  
Machavaram Kartikeyan
Keyword(s):  
Wireless Local Area Network ◽  
Local Area Network ◽  
Design Procedure ◽  
Monopole Antenna ◽  
Dual Band ◽  
Impedance Bandwidth ◽  
Area Network ◽  
Defected Ground Structure ◽  
Ground Structure ◽  
Simulation Results

In the present work, a novel multistrip monopole antenna fed by a cross-shaped stripline comprising one vertical and two horizontal strips has been proposed for wireless local area network (WLAN)/Industrial, Scientific, and Medical band (ISM)/International Mobile Telecommunication (IMT)/BLUETOOTH/Worldwide Interoperability for Microwave Access (WiMAX) applications. The designed antenna has a small overall size of 20 × 30 mm2. The goal of this paper is to use defected ground structure (DGS) in the proposed antenna design to achieve dual-band operation with appreciable impedance bandwidth at the two operating modes satisfying several communication standards simultaneously. The antenna was simulated using Computer Simulation Technology Microwave Studio (CST MWS) V9 based on the finite integration technique (FIT) with perfect boundary approximation. Finally, the proposed antenna was fabricated and some performance parameters were measured to validate against simulation results. The design procedure, parametric analysis, simulation results along with measurements for this multistrip monopole antenna using DGS operating simultaneously at WLAN (2.4/5.8 GHz), IMT (2.35 GHz), BLUETOOTH (2.45 GHz), and WiMAX (5.5 GHz) are presented.

scholarly journals A novel automobile antenna for vehicles communication of IoT systems in 5G network

2020 ◽  
Vol 2020 (1) ◽  
Author(s):  
Wei Luo ◽  
Wuquan Chen ◽  
Yulu Feng ◽  
Yuqi Yang
Keyword(s):  
Mobile Communication ◽  
Communication System ◽  
Wireless Local Area Network ◽  
Local Area Network ◽  
Impedance Matching ◽  
Antenna System ◽  
Area Network ◽  
Mobile Communication System ◽  
Blind Area ◽  
Simulation Results

Abstract The Internet of vehicles (IoV) is an important part of mobile communication system with the development of Internet of things. A novel multiband automobile antenna is proposed, which can cover all frequency bands for the long-term evolution (LTE), the fifth generation wireless systems (5G), the wireless local area network and the dedicated short-range communication (from 690 to 944 MHz and from 1.46 to 6 GHz). The antenna is designed based on the monopole antenna, and the impedance matching performance of the antenna is improved by loading the toothed capacitor and the impedance matching disk. The simulation results show that the automobile antenna achieves good impedance matching in the working bandwidth and obtains omnidirectional radiation pattern in the horizontal direction. The electric field distribution of the antenna placed on the vehicle roof is simulated to evaluate the network performance of the antenna system in the urban environment. The transmission coefficient of the transceiver system using the automobile antenna is also analyzed based on the electromagnetic simulation results and statistical model. The blind area of mobile communication system is effectively covered with the automobile antenna, which could be used to connect the LTE cell and the IoV system.

scholarly journals Experimental Results of Network-Assisted Interference Suppression Scheme Using Adaptive Beam-Tilt Switching

2017 ◽  
Vol 2017 ◽  
pp. 1-10
Author(s):  
Tomoki Murakami ◽  
Riichi Kudo ◽  
Koichi Ishihara ◽  
Masato Mizoguchi ◽  
Naoki Honma
Keyword(s):  
Wireless Local Area Network ◽  
Local Area Network ◽  
Interference Suppression ◽  
Multiple Input Multiple Output ◽  
Local Area ◽  
Experimental Results ◽  
System Throughput ◽  
Area Network ◽  
Network Systems ◽  
Transmit Power

This paper introduces a network-assisted interference suppression scheme using beam-tilt switching per frame for wireless local area network systems and its effectiveness in an actual indoor environment. In the proposed scheme, two access points simultaneously transmit to their own desired station by adjusting angle of beam-tilt including transmit power assisted from network server for the improvement of system throughput. In the conventional researches, it is widely known that beam-tilt is effective for ICI suppression in the outdoor scenario. However, the indoor effectiveness of beam-tilt for ICI suppression has not yet been indicated from the experimental evaluation. Thus, this paper indicates the effectiveness of the proposed scheme by analyzing multiple-input multiple-output channel matrices from experimental measurements in an office environment. The experimental results clearly show that the proposed scheme offers higher system throughput than the conventional scheme using just transmit power control.

scholarly journals Multiple BSSs Association Based Spatial Clustering Group Access Protocol for Next Generation WLAN

2019 ◽  
Vol 37 (4) ◽  
pp. 809-815
Author(s):  
Yong Li ◽  
Bo Li ◽  
Mao Yang ◽  
Zhongjiang Yan
Keyword(s):  
Wireless Local Area Network ◽  
Local Area Network ◽  
Spatial Clustering ◽  
Spatial Location ◽  
Local Area ◽  
Area Network ◽  
Next Generation ◽  
Coverage Area ◽  
Collaboration Technology ◽  
Multi Band

The next generation Wireless Local Area Network (WLAN) IEEE 802.11be regards Extremely High Throughput (EHT) as its core technology goal, among which multi-band capability and AP cooperation technology are regarded as its key technologies. However, the existing research on Orthogonal Frequency Division Multiple Access (OFDMA) protocol does not consider the multi-band capability and AP collaboration technology of IEEE 802.11be, so the improvement of system performance is limited and does not meet the EHT requirement. Especially when the nodes in overlapping coverage area have a large number of traffic, it is more important to improve the throughput of nodes in overlapping coverage area. In order to improve the throughput of nodes in overlapping coverage area, this paper proposes a spatial clustering group OFDMA protocol associated with multiple Basic Service Sets (BSSs). The protocol allows nodes in overlapping coverage area to be associated with multiple BSSs at the same time by using multi-band capability, that is, multi-association; Using AP collaboration technology allows nodes to perform parallel backoff with channels on multiple BSSs to improve access efficiency. Nodes in the overlapping coverage area are associated with the channels of multiple BSSs for parallel backoff. Node completed backoff and successfully accessed triggers a spatial clustering group (SCG) with close to its spatial location. OFDMA mode is used by SCG to access and transmit, thus increasing the access opportunities of nodes within overlapping coverage, thereby improving the throughput. The simulation results show that using the SCG-OFDMA protocol proposed in this paper associated with two BSSs, its throughput of nodes within overlapping coverage can achieve 353.41% higher than the IEEE 802.11ax protocol and 558.33% higher than the OMAX protocol respectively.

scholarly journals Vertical handoff algorithm for different wireless technologies

2017 ◽  
Author(s):  
Radhwan Mohamed Abdullah ◽  
Zuriati Ahmad Zukarnain
Keyword(s):  
Wireless Network ◽  
Wireless Local Area Network ◽  
Local Area Network ◽  
Vertical Handover ◽  
Vertical Handoff ◽  
Area Network ◽  
Heterogeneous Wireless Network ◽  
Decision Algorithm ◽  
Handover Decision ◽  
Simulation Results

Transferring a huge amount of data between different network locations over the network links depends on the heterogeneous wireless network. Such a network consists of several networks with different access technologies. Traditionally, a mobile device may be moved to achieve the operations of vertical handover, considering only one criterion, that is, the received signal strength (RSS). The use of a single criterion may cause service interruption, an unbalanced network load, and an inefficient vertical handover. In this paper, we propose enhanced vertical handover decision algorithm based on multiple criteria in the heterogeneous wireless network. The algorithm consists of three technology interfaces: Long-Term Evolution (LTE), Worldwide interoperability for Microwave Access (WiMAX), and Wireless Local Area Network (WLAN). It also employs three types of the vertical handover decision algorithms: equal priority, mobile priority, and network priority. The simulation results illustrate that the proposed handover decision algorithm outperforms the traditional network decision algorithm in terms of handover number probability and the handover failure probability. In addition, it is noticed that the network priority handover decision algorithm produces better results compared to equal priority and mobile priority handover decision algorithm. Finally, the simulation results are validated by the analytical model.

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