scholarly journals Improving Spatial Reuse of Wireless LAN Uplink Using BSS Color and Proximity Information

2021 ◽  
Vol 11 (22) ◽  
pp. 11074
Author(s):  
Hyerin Kim ◽  
Jungmin So
Keyword(s):  
Wireless Lan ◽  
Multiple Access ◽  
Local Area Networks ◽  
Local Area ◽  
Wireless Local Area Networks ◽  
Spatial Reuse ◽  
Carrier Sense Multiple Access ◽  
Medium Access ◽  
Network Systems ◽  
Carrier Sensing

With the density of wireless networks increasing rapidly, one of the major goals in next-generation wireless LANs (Local Area Networks) is to support a very dense network with a large number of closely deployed APs (Access Points) and crowded users. However, the CSMA (Carrier-Sense Multiple Access)-based medium access control of current wireless network systems suffers from significantly degraded performance when the network becomes dense. Recent WLAN (Wireless Local Area Networks) standards include measures for increasing spatial reuse such as BSS (Basic Service Set) coloring, but the schemes based on BSS coloring such as OBSS/PD (Overlapping BSS/Preamble Detection) have limitations in improving spatial reuse. In this paper, we propose a spatial reuse method for uplink which can utilize BSS color and proximity information to improve the efficiency of carrier sensing and thus spatial reuse. Specifically, through the BSS color and the proximity information, a node receiving a preamble can figure out how far the receiver of the ongoing traffic is located. This information is used to determine whether the node should aggressively start transmitting or defer its transmission to protect the ongoing transmission. Simulation results show that the proposed method outperforms existing methods in terms of throughput and fairness.

scholarly journals Dynamic Carrier-Sense Threshold Selection for Improving Spatial Reuse in Dense Wireless LANs

2019 ◽  
Vol 9 (19) ◽  
pp. 3951 ◽  
Author(s):  
Jungmin So ◽  
Joosang Lee
Keyword(s):  
Wireless Lan ◽  
Medium Access Control Protocol ◽  
System Throughput ◽  
Spatial Reuse ◽  
Medium Access ◽  
Packet Losses ◽  
Single Carrier ◽  
Carrier Sense ◽  
Carrier Sensing ◽  
Key Techniques

As density of a wireless LAN grows, per-user throughput degrades severely, deteriorating user experience. To improve service quality, it is important to increase system spectral efficiency. Controlling carrier-sense threshold is one of the key techniques to achieve the goal, because frequently transmissions are unnecessarily blocked by carrier sensing, even though these transmissions can take place without causing packet losses. Using high carrier-sense threshold and allowing nodes to transmit aggressively may increase the system throughput, but this approach can lead to unfair channel share and cause starvation for the edge nodes. In this paper, we propose a medium access control protocol where transmitters include the carrier-sense threshold required to protect its packet in the preamble. Nodes receiving the preamble only transmit concurrently, when they are confident that their own transmission as well as the on-going transmission will both be successfully received at the respective receivers. The simulation results show that this dual-threshold approach can achieve higher system throughput compared to using a single carrier-sense threshold, without penalizing edge nodes.

scholarly journals Throughput Analysis of IEEE 802.11 WLANs with Inter-Network Interference

2020 ◽  
Vol 10 (6) ◽  
pp. 2192 ◽  
Author(s):  
Jingwei Liu ◽  
Takumi Aoki ◽  
Zhetao Li ◽  
Tingrui Pei ◽  
Young-june Choi ◽  
...  
Keyword(s):  
Local Area Networks ◽  
Local Area ◽  
Wireless Local Area Networks ◽  
Network Throughput ◽  
Transmission Time ◽  
Carrier Sensing ◽  
Network Interference ◽  
Network Carrier ◽  
Analytical Expressions ◽  
Simultaneous Transmission

Recently, we often see the environment where many one-to-one Wireless Local Area Networks (WLANs) exist in a small area. In this environment, the network throughput of certain WLAN reduces significantly because of the interference from other networks (i.e., inter-network interference). The inter-network interference is the effect of carrier-sensing activities when there are ongoing transmissions in neighbor networks. This paper presents analytical expressions using airtime concept, which newly take into account the inter-network interference, for network throughputs of WLANs. There are existing works that similarly address the WLAN’s carrier-sensing duration. However, they either consider a simple interference model or assume the simultaneous transmission time is negligible. Different from them, we consider the significant impact of simultaneous transmission. As a result, our analytical model can precisely express each network carrier-sensing duration by subtracting the simultaneous transmission time. More specifically, we have successfully obtained each network throughput by expressing frame-existence probabilities concerning each network’s End Device (ED). We also confirm the validity of the analysis by comparison with simulation. The analytical results and the simulation results agree well.

scholarly journals TUGAS 2 JARINGAN KOPMUTER (MUHAMMAD ARIF_175100040) SEJARAH WIFI DAN PERKEMBANGAN WIFI

2019 ◽  
Author(s):  
muhammad arif
Keyword(s):  
Ieee 802.11 ◽  
Wireless Lan ◽  
Hot Spot ◽  
Local Area Networks ◽  
Local Area ◽  
Wireless Local Area Networks ◽  
Wireless Fidelity

Wi-Fi merupakan kependekan dari Wireless Fidelity, yang memiliki pengertian yaitu sekumpulan standar yang digunakan untuk Jaringan Lokal Nirkabel (Wireless Local Area Networks - WLAN) yang didasari pada spesifikasi IEEE 802.11. WI-FI merupakan istilah yang diberikan untuk sistem wireless LAN yang menggunakan standar 802.11 yang ada saat ini. Istilah WI-FI diciptakan oleh sebuah organisasi bernama WI-FI alliance yang bekerja menguji dan memberikan sertifikasi untuk perangkat-perangkat WLAN. Perangkat wireless diuji berdasarkan interoperabilitasnya dengan perangkat-perangkat wireless lain yang menggunakan standar yang sama. Setelah diuji dan lulus, sebuah perangkat akan diberi sertifikasi Artinya perangkat ini bisa bekerja dengan baik dengan perangkat-perangkat wireless lain yang juga bersertifikasi ini. Pada awalnya, sertifikasi WI-FI hanya diberikan pada perangkat wireless yang bekerja pada standar 802.11b. Wi-Fi (Wireless Fidelity) adalah koneksi tanpa kabel seperti handphone dengan mempergunakan teknologi radio sehingga pemakainya dapat mentransfer data dengan cepat dan aman. Wi-Fi tidak hanya dapat digunakan untuk mengakses internet, Wi-Fi juga dapat digunakan untuk membuat jaringan tanpa kabel di perusahaan. Karena itu banyak orang mengasosiasikan Wi-Fi dengan kebebasan, karena teknologi Wi-Fi memberikan kebebasan kepada pemakainya untuk mengakses internet atau mentransfer data dari ruang meeting, kamar hotel, kampus bertanda Wi-Fi Hot Spot. Wi-Fi sudah sangat populer di luar negeri. Amerika Serikat adalah salah satu negara yang paling berhasil memasyarakatkan Wi-Fi. Bahkan, beberapa PDA di Amerika Serikat dirancang secara khusus dengan modul Wi-Fi terintegrasi. Oleh karena kemudahan koneksi, reliabilitas, dan kecepatannya, Wi-Fi tampak cukup berhasil. Penggunaan hubungan nirkabel (wireless) sampai saat ini mengandalkan gelombang elektromagnetik, baik berbentuk gelombang radio maupun cahaya. Kata Kunci : Sejarah Wifi Dan Perkembangan Wifi

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