bluetooth technology paper presentation
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Submitted By,
Naga sowjanya Barla

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INTRODUCTION:
During the past two decades, the advancement in microelectronics and VLSI technology dipped down the cost of many consumer electronic products to a level which was affordable for the common man. The first quarter of 2001, saw the vending of about 32.5 million PCs. The sale of cellular phones is predicted to reach 1 billion in 2005. With increase in the number of electronic devices, comes in the need of connecting them together for maximum interoperability and utilization. These devices connect with each other using a variety of wires, cables, radio signals and infrared light beams, and an even greater variety of connectors, plugs and protocols. Bluetooth is devised to replace these cables.
Bluetooth is a global standard for wireless connectivity. Bluetooth technology facilitates the replacement of the cables used to connect one device to another, with one universal short-range radio page link operating in the unlicensed 2.45 GHz ISM band. The main objectives of Bluetooth technology can be described as follows,
 Cable replacement: Getting rid of the various types of cables and wires required for interconnectivity between various devices would enable the lay man to use all electronic devices without wasting time and money.
 Small size: the Bluetooth device is very small so that it can be attached to any device required like the cell phones without adding much to the weight of the system.
 Low cost: Bluetooth is aimed to be a low cost device approximately $5 in the near future.
 Low power: The utilization of power is very less (within 100 mW) as it is short range equipment and so it facilitates the use of small batteries for its usage.
Besides the characteristics mentioned above, Bluetooth can imitate a universal bridge to attach the existing data networks, and also as a mechanism for forming ad-hoc networks. Designed to operate in noisy frequency environments, the Bluetooth radio uses a fast acknowledgement and frequency hopping scheme to make the page link robust.
HISTORY:
In 1994, Ericsson in Sweden launched an initiative to study a low-power, low-cost radio interface between mobile phones and their accessories. After three years, In 1997, Ericsson approached various manufacturers of mobile electronic devices to discuss the development and promotion of this short range wireless radio page link as alone this phenomenon could not be implemented.
Thus in 1998, Ericsson, IBM, Intel, Toshiba and NOKIA formed the Special Interest Group (SIG) for the promotion and development of BLUETOOTH technology. The first Bluetooth silicon was also ready in 1998. As we can see that the SIG included two market leaders in mobile telephony, two in laptop computing and one in digital signal processing technology. The biggies being in the game gave an impetus to thousands of companies to join hands with the SIG for the endorsement and expansion of this technology.
One would wonder how Bluetooth got its name. It has an interesting heritage. Bluetooth is named after the 10th century Viking King Harald Blatand (Blatand meaning Bluetooth). He was instrumental in uniting the countries in the Baltic region like Sweden, Denmark, Norway and thus emerging as a powerful force. Bluetooth aims at uniting the computing and telecommunication world and so achieving the same greatness.
WORKING OF BLUETOOTH:
Basically, Bluetooth is the term used to describe the protocol of a short range (10 meter) frequency-hopping radio page link between devices. These devices implementing the Bluetooth technology are termed Bluetooth - enabled. Documentation on Bluetooth is divided into two sections, the Bluetooth Specification and Bluetooth Profiles.
• The Specification describes how the technology works (i.e. the Bluetooth protocol architecture),
• The Profiles describe how the technology is used (i.e. how different parts of the specification can be used to fulfill a desired function for a Bluetooth device).
BLUETOOTH PROTOCOL ARCHITECTURE:
As the report is designed mainly for the spread spectrum techniques course, the protocols in the lower level are described more extensively and the upper layer protocols are just mentioned with a very brief description.
Moreover, one should note that the upper layer protocols are totally dependent on the lower level protocols whereas the lower level protocols can function independently even with a totally different set of upper protocols.
Bluetooth Radio: The Bluetooth Radio (layer) is the lowest defined layer of the Bluetooth specification. It defines the requirements of the Bluetooth transceiver device operating in the 2.4GHz ISM band. The Bluetooth air interface is based on three power classes,
• Power Class 1: designed for long range (~100m), max output power of 20 dBm,
• Power Class 2: ordinary range devices (~10m), max output power of 4 dBm,
• Power Class 3 short range devices (~10cm), with a max output power of 0 dBm.
The radio uses Frequency Hopping to spread the energy across the ISM spectrum in 79 hops displaced by 1MHz, starting at 2.402GHz and stopping at 2.480GHz.Some countries use the 79 RF channels whereas countries like Japan use 23 channels. Currently, the SIG is working to harmonize this 79-channel radio to work globally and has instigated changes within Japan, Spain, and other countries. Also, the Bluetooth radio module uses GFSK (Gaussian Frequency Shift Keying) where a binary one is represented by a positive frequency deviation and a binary zero by a negative frequency deviation. BT is set to 0.5 and the modulation index must be between 0.28 and 0.35. The receiver must have a sensitivity level for which the bit error rate (BER) 0.1% is met. For Bluetooth this means an actual sensitivity level of -70dBm or better.
Baseband: The Baseband is the physical layer of the Bluetooth. It manages physical channels and links apart from other services like error correction, data whitening, hop selection and Bluetooth security. As mentioned previously, the basic radio is a hybrid spread spectrum radio. Typically, the radio operates in a frequency-hopping manner in which the 2.4GHz ISM band is broken into 79 1MHz channels that the radio randomly hops through while transmitting and receiving data. A piconet is formed when one Bluetooth radio connects to another Bluetooth radio.
Both radios then hop together through the 79 channels. The Bluetooth radio system supports a large number of piconets by providing each piconet with its own set of random hopping patterns. Occasionally, piconets will end up on the same channel. When this occurs, the radios will hop to a free channel and the data are retransmitted (if lost). The Bluetooth frame consists of a transmit packet followed by a receive packet. Each packet can be composed of multiple slots (1, 3, or 5) of 625us. A typical single slot frame typically hops at 1,600 hops/second. Multi-slot frames allow higher data rates because of the elimination of the turn-around time between packets and the reduction in header overhead.
LMP: The Link Manager Protocol is used by the Link Managers (on either side) for page link set-up and control.
HCI: The Host Controller Interface provides a command interface to the Baseband Link Controller and Link Manager, and access to hardware status and control registers.
L2CAP: Logical Link Control And Adaptation Protocol supports higher level protocol multiplexing, packet segmentation and reassembly, and the conveying of quality of service information.
RFCOMM: The RFCOMM protocol provides emulation of serial ports over the L2CAPprotocol. The protocol is based on the ETSI standard TS 07.10.
SDP: The Service Discovery Protocol provides a means for applications to discover which services are provided by or available through a Bluetooth device. It also allows applications to determine the characteristics of those available services.
PROFILES:
The profiles have been developed in order to portray how implementations of user models are to be accomplished. The user models describe a number of user scenarios where Bluetooth performs the radio transmission. A profile can be described as a vertical slice through the protocol stack. It defines options in each protocol that are compulsory for the profile. It also defines parameter ranges for each protocol. The profile concept is used to decrease the risk of interoperability problems between different manufacturers' products. For example: The Headset profile defines the requirements for Bluetooth devices necessary to support the Headset use case. The Fax profile defines to support the Fax use case. There are as many profiles as applications which are growing everyday.
NETWORK TOPOLOGY
The Bluetooth system supports both point to point and point to multipoint connections.
PICONETS: Bluetooth radios connect to each other in piconets, which are formed by a master radio simultaneously connecting up to seven active slave radios [ 3 bit address] in an Ad-hoc manner. There can be up to 256 parked slaves [ 8 bit address] which like the active members are synchronized to the master clock. Each piconet has a unique hopping sequence. To form a piconet, the Bluetooth radio needs to understand two parameters: the hopping pattern of the radio it wishes to connect to and the phase within that pattern. In forming a piconet, the master radio shares its Global ID with the other radios, which then become slaves and provide all the radios with the correct hopping pattern. The master also shares its clock offset (represented by the clock dial) with the slaves in the piconet, providing the offset into the hopping pattern. This information can easily be exchanged via the FHS packet.
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bluetooth technology ppt - by projectsofme - 27-09-2010, 03:23 PM
RE: bluetooth technology paper presentation - by seminar class - 23-04-2011, 10:53 AM

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