Sobivanje protokolov BLE in Wi-Fi

Kerševan, Gregor (author), Zimic, Nikolaj (mentor)

Bluetooth Low Energy je ena izmed bolj popularnih tehnologij, ki se uporablja za implementacijo komunikacije manjših elektronskih naprav. Zaradi delovanja v frekvenčno zelo zasedenem območju pa je izpostavljen mnogim motnjam. Diplomsko delo se osredotoča na vpliv motenj Wi-Fi na komunikacijo BLE naprav. S praktičnimi poskusi želimo prikazati načine izmikanja motnjam ter analizirati uspešnost komunikacije ob prisotnosti motenj. Ugotovili smo, da motnje vplivajo na oglaševalske kanale le v neposredni bližini BLE naprav. Ob vzpostavljeni BLE komunikaciji je vpliv motenj na enem Wi-Fi kanalu majhen, saj napravi uporabljata mehanizem skakanja med kanali, ki skoraj izniči njihov vpliv. Ob motnjah na celotnem frekvenčnem spektru ostaneta dva kanala, ki sta vedno zadnja dva podatkovna kanala.

• Language: Slovenian
• Keywords: BLE, Wi-Fi, motnje
• Work type: Bachelor thesis/paper
• Organization: FRI - Faculty of Computer and Information Science
• Year: 2019
• PID: 20.500.12556/RUL-108583
• Publication date in RUL: 08.07.2019

Secondary language

• Language: English
• Title: Wi-Fi and BLE coexistence

Abstract

Bluetooth Low Energy is one of the most popular technologies used by small electronic devices for wireless communication. Because it operates in an overcrowded frequency band it is exposed to a lot of interferences. This thesis focuses on the influence of Wi-Fi interferences on the communication of BLE devices. With practical experiments, we want to show different ways of countering interferences and analyze how successful BLE communication is. We found out, that interferences have an effect on advertising channels only in close proximity. When a BLE communication is established, Wi-Fi traffic on one Wi-Fi channel has little effect on the success rate of packets, as BLE uses a frequency hopping method, which almost completely negates any effect. When there is Wi-Fi traffic on the whole BLE frequency band only two channels remain, which are always the last two data channels.

• Keywords: BLE, Wi-Fi, interferences