Bluetooth (802.15.1) | Computer Networks - Computer Science Engineering (CSE) PDF Download

Bluetooth (802.15.1)
Bluetooth fills the niche of very short-range communication between mobile phones,PDAs, Notebook computers, and other personal or peripheral devices. For example, Bluetooth can be used to connect a mobile phone to a headset, or a notebook computer to a printer. Bluetooth is a more convenient alternative to connecting two devices with a wire. In such applications, it is not necessary to provide much range or bandwidth. This is fortunate for some of the target battery-powered devices, since it is important that they not consume much power.

Bluetooth operates in the license-exempt band at 2.45 GHz. It has a range of only about 10 m. For this reason, and because the communicating devices typically belong to one individual or group, Bluetooth is sometimes categorized as a personal area network (PAN). Version 2.0 provides speeds up to 2.1 Mbps. Power consumption is low.Bluetooth is specified by an industry consortium called the Bluetooth Special Interest Group. It specifies an entire suite of protocols, going beyond the link layer to define application protocols, which it calls profiles, for a range of applications. For example, there is a profile for synchronizing a PDA with a personal computer. Another profile gives a mobile computer access to a wired LAN in the manner of 802.11, although this was not Bluetooth’s original goal.

The IEEE 802.15.1 standard is based on Bluetooth but excludes the application protocols. The basic Bluetooth network configuration, called a piconet, consists of a master device and up to seven slave devices. Any communication is between the master and a slave; the slaves do not communicate directly with each other. Because slaves have a simpler role, their Bluetooth hardware and software can be simpler and cheaper.Since Bluetooth operates in an license-exempt band, it is required to use  spread spectrum Technique to deal with possible interference in the band. It uses frequency hopping with 79 channels (frequencies), using each for 625 μm at a time. This provides a natural time slot for Bluetooth to use for synchronous time division multiplexing. A frame takes up 1, 3, or 5 consecutive time slots.

A slave device can be parked: set to an inactive, low-power state. A parked device cannot communicate on the piconet; it can only be reactivated by the master. A piconet can have up to 255 parked devices in addition to its active slave devices. ZigBee is a newer technology that competes with Bluetooth to some extent. Devised by the ZigBee alliance and standardized as IEEE 802.15.4, it is designed for situations where the bandwidth requirements are low and power consumption must be very low to give very long battery life. It is also intended to be simpler and cheaper than Bluetooth, making it financially feasible to incorporate in cheaper devices such as a wall switch that wirelessly communicates with a ceiling-mounted fan.

Bluetooth (802.15.1) | Computer Networks - Computer Science Engineering (CSE)

 

The document Bluetooth (802.15.1) | Computer Networks - Computer Science Engineering (CSE) is a part of the Computer Science Engineering (CSE) Course Computer Networks.
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FAQs on Bluetooth (802.15.1) - Computer Networks - Computer Science Engineering (CSE)

1. What is Bluetooth 802.15.1?
Ans. Bluetooth 802.15.1 is a wireless communication technology that allows devices to connect and exchange data over short distances. It is commonly used for connecting devices such as smartphones, tablets, laptops, and peripherals like keyboards, mice, and headphones.
2. How does Bluetooth 802.15.1 work?
Ans. Bluetooth 802.15.1 uses radio waves to establish a connection between devices. It operates in the 2.4 GHz ISM band and uses frequency-hopping spread spectrum (FHSS) to minimize interference from other devices. When two Bluetooth-enabled devices come into range and have compatible profiles, they can pair and establish a secure connection.
3. What are the advantages of Bluetooth 802.15.1?
Ans. Bluetooth 802.15.1 offers several advantages. It provides wireless connectivity, eliminating the need for cables. It has low power consumption, making it suitable for battery-powered devices. It supports multiple devices connected simultaneously, allowing for seamless multitasking. It also has a relatively simple setup process and is widely supported across different devices and platforms.
4. What is the range of Bluetooth 802.15.1?
Ans. The range of Bluetooth 802.15.1 typically depends on the class of the device. Class 1 devices have a range of around 100 meters (330 feet), class 2 devices have a range of approximately 10 meters (33 feet), and class 3 devices have a range of about 1 meter (3 feet). However, various factors such as obstructions, interference, and signal strength can affect the actual range.
5. Can Bluetooth 802.15.1 interfere with Wi-Fi?
Ans. Bluetooth 802.15.1 operates in the same 2.4 GHz frequency band as Wi-Fi, which can potentially cause interference. However, both technologies use different methods to mitigate interference. Wi-Fi uses a combination of frequency channels and modulation techniques, while Bluetooth uses frequency-hopping spread spectrum (FHSS). In most cases, interference between Bluetooth and Wi-Fi is minimal, but it can occur if multiple devices are transmitting simultaneously.
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