scholarly journals A User Prioritisation Algorithm for Horizontal Handover in Dense WLANs

2021 ◽  
Author(s):  
Omar A. Aldhaibani ◽  
Alessandro Raschellà ◽  
Ghulam Mohi-Ud-Din ◽  
Michael Mackay
Keyword(s):  
Performance Evaluation ◽  
Quality Of Experience ◽  
State Of The Art ◽  
Local Area Networks ◽  
Local Area ◽  
Wireless Networking ◽  
Wireless Local Area Networks ◽  
Horizontal Handover ◽  
Throughput And Delay

AbstractThis paper proposes an algorithm that enhances horizontal handover (HO) in dense wireless local area networks (WLANs), which is implemented in a software-defined wireless networking (SDWN)-based architecture. The algorithm considers the concept of user prioritisation, classifying the WLAN stations (STAs) into two categories representing high and low priorities respectively, and always attempts to guarantee the best quality of experience (QoE) to the high priority users. The architecture that implements the algorithm leverages the flexibility, programmability, and centralised nature of SDWN to efficiently manage the HO process. Moreover, the paper presents a performance evaluation campaign that demonstrates significant achievements against a state-of-the-art solution in terms of the provided QoE, throughput and delay. Finally, we discuss the importance of considering user prioritisation in a HO algorithm for dense WLANs.

scholarly journals AP Deployment Research Based on Physical Distance and Channel Isolation

2014 ◽  
Vol 2014 ◽  
pp. 1-7 ◽  
Author(s):  
Dangui Yan ◽  
Chengchang Zhang ◽  
Honghua Liao ◽  
Lisheng Yang ◽  
Ping Li ◽  
...  
Keyword(s):  
Local Area Networks ◽  
Access Point ◽  
Local Area ◽  
Physical Distance ◽  
Mutual Interference ◽  
Optimal Location ◽  
Wireless Local Area Networks ◽  
Position Information ◽  
Penalty Factor

Aiming at the problem of inefficiency of wireless local area networks (WLAN) access point (AP) deployment in urban environment, a new algorithm for AP deployment based on physical distance and channel isolation (DPDCI) is proposed. First, it detects the position information of deployed APs and then calculates the interference penalty factor combined with physical distance and channel isolation, and finally gets the optimal location and channel of the new AP through the genetic algorithm. Comparing with NOOCA algorithm and NOFA-2 algorithm, the results of numerical simulation show that the new algorithm can minimize the mutual interference between basic service sets (BSS), can ensure the maximum of throughput based on quality of service (QoS) in BSS, and can effectively improve the system performance.

scholarly journals Improved Association and Disassociation Scheme for Enhanced WLAN Handover and VHO

2016 ◽  
Vol 2016 ◽  
pp. 1-6 ◽  
Author(s):  
Sungjin Shin ◽  
Donghyuk Han ◽  
Hyoungjun Cho ◽  
Jong-Moon Chung
Keyword(s):  
Mobile Devices ◽  
Local Area Networks ◽  
Access Point ◽  
Local Area ◽  
Vertical Handover ◽  
Base Station ◽  
Wireless Local Area Networks ◽  
Received Signal Strength Indicator ◽  
Wireless Protocol

The number of mobile devices and wireless connections is significantly increasing. Among many wireless protocol types, wireless local area networks (WLANs) are expected to support a significant number of devices. Due to this reason, effective and efficient handover (HO) and vertical handover (VHO) support for WLAN mobile devices is important. A significant improvement in quality of service (QoS) can be obtained by reducing the association and disassociation interruption time for user equipment (UE) servicing real-time applications during WLAN HO and VHO operations. Based on this focus, this paper investigates the problem of using only the received signal strength indicator (RSSI) in HO and VHO decisions, which is what the current IEEE 802.11 based WLAN systems use. Experimental results presented in this paper demonstrate that only using the RSSI results in significant interruption time during HO to another WLAN access point (AP) or to a cellular base station during VHO. Therefore, in this paper, an improved association and disassociation scheme that can reduce the data interruption time (DIT) and improve the throughput performance is proposed.

scholarly journals Performance evaluation for outdoor wireless scenarios based on IEEE 802.11b/g in the presence of co-channel interference

2020 ◽  
Vol 9 (1) ◽  
pp. 187-197
Author(s):  
Roman Alcides Lara-Cueva ◽  
Michael Santiago Simba-Herrera
Keyword(s):  
Local Area Networks ◽  
Local Area ◽  
Wireless Local Area Networks ◽  
Voice Over Internet Protocol ◽  
Ieee 802.11B ◽  
Time Service ◽  
Delay Jitter ◽  
Channel Interference ◽  
Optimal Values

Voice over Internet Protocol (VoIP) has evolved over the years, being a real-time service. VoIP has been coupled to different technologies, one of them is WiFi, which is one of the most used for wireless local area networks in domestic and commercial environments. In this paper, we evaluate the performance of wireless scenarios by considering VoIP traffic, based on WiFi technology in conformance with IEEE 802.11b/g in interfered outdoor scenarios, by considering an intrusive injection traffic technique, for codecs G711 (1 sample), G711 (2 samples), G723, G729 (2 samples), and G729 (3 samples), related to the main metrics associated to Quality of Service (QoS) parameters. Our results show the best performance was obtained with the codecs G723 and G729 (3 samples), obtaining up to 30 simultaneous voice connections with optimal values of delay, jitter and packet loss according to the recommendations given for VoIP by ITU-T, while the worst performance was obtained with the codec G711 (2 samples), obtaining only 5 simultaneous voice connections, reaching an efficiency loss of around 18% in a co-channel interference scenario.

Sign in / Sign up

Export Citation Format

Share Document