Protols used in bluetooth

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Information about Protols used in bluetooth
Education

Published on March 6, 2014

Author: sonalizoya

Source: slideshare.net

Description

Protocol layers are a hierarchical model of network or communication functions. The divisions of the hierarchy are referred to as layers or levels, with each layer performing a specific task. In addition, each protocol layer obtains services from the protocol layer below it and performs services for the protocol layer above it. The Bluetooth system divides communication functions into protocol layers.
The Bluetooth system consists of many existing protocols that are directly used or have been adapted to the specific use of the Bluetooth system. Protocols are often divided into groups that are used for different levels of communication (a protocol stack). Lower level protocols (such as protocols that are used to manage a radio link between specific points) are only used to create, manage, and disconnect transmission between specific points. Mid-level protocols (such as transmission control protocols) are used to create, manage, and disconnect a logical connection between endpoints that may have multiple link connections between them. High level protocols (application layer protocols) are used to launch, control, and close end-user applications.
Some of the layers associated with the Bluetooth system include the baseband layer (physical layer), link layer, host controller interface (HCI), logical link control applications protocol (L2CAP), RF Communications protocol (RFCOMM), Object Exchange (OBEX), and service discovery.

Mobile Computing: Protocols Used In Bluetooth Presented By: Ms. Sonali. Parab. MscIT Part 1, Semester 2. Incharge: Mr. Jadhav.

▪ ▪ ▪ ▪ ▪ ▪ ▪ ▪ ▪ Overview of the content: Introduction. Technology Review. Specification of Bluetooth technology. Architecture of Bluetooth Protocol. Protocols in Bluetooth Stack. Advantages And Disadvantages Bluetooth. Future of Bluetooth Conclusion Bibliography

Introduction. ▪ Wireless technology standard for exchanging data over short distances. ▪ Personal Area Networks(PAN). ▪ Invented by telecom vendor Ericsson in 1994.

Introduction. ▪ Originally was a wire replacement technology. ▪ Applications: Mobile phones, Laptops, Bluetooth Headsets, Telehealth devices, etc.

Technology Review. ▪ Bluetooth uses radio technology called “Frequency Hopping spread Spectrum”. ▪ Supports data rate of I mb/s (originally). ▪ Managed by the Bluetooth Special Interest Group (SIG). ▪ Bluetooth was standardized as IEEE 802.15.1, but the standard is no longer maintained.

Specification of Bluetooth technology. ▪ Core Specification Deals with lower layers of architecture and describes how technology works. ▪ Profile Specification Focuses on how to build inter operating devices using the core technology.

Architecture of Bluetooth Protocol.

Protocols Used In Bluetooth. Radio: ▪ Is situated at the most bottom of all the layers. ▪ Used in the specification of the air interfaces like frequencies, modulation, transmit power ▪ Bluetooth radio is a transceiver which transmits and receives modulated electrical signals from peer Bluetooth devices

Protocols Used In Bluetooth. Baseband: ▪ The Baseband and Link control layer enable the physical connection between any Bluetooth enabled products. ▪ This layer also controls the synchronisation and the frequency hopping sequence. ▪ The 2 different link types Synchronous Connection Oriented (SCO) and Asynchronous Connectionless (ACL) are also managed by this layer.

Protocols Used In Bluetooth. Audio: ▪ Audio transmissions can be performed between one or more Bluetooth enabled units, using a number of different usage models. ▪ Audio data does not go through the L2CAP layer (see diagram 1) but directly between 2 Bluetooth units.

Protocols Used In Bluetooth. Host Controller Interface (HCI): : ▪ The Host Controller Interface provides an interface method for accessing the Bluetooth hardware capabilities. ▪ It contains a command interface, which acts between the Baseband controller and link manager and has access to hardware status. ▪ It contains the control and event registers.

Protocols Used In Bluetooth. Link Manager protocol (LMP): ▪ The Link Manager Protocol, is responsible for link set-up between Bluetooth enabled units. ▪ It handles the control and negotiation of packet sizes used when transmitting data. ▪ The Link Manager Protocol also handles management of power modes, power consumption, and state of a Bluetooth unit in a piconet. ▪ Finally, this layer handles generation, exchange and control of link and encryption keys for authentication and encryption

Protocols Used In Bluetooth. Logical Link Control and Adaption Protocol (L2CAP): ▪ The Bluetooth logical link control and adaptation protocol is situated over the Baseband layer and beside the Link Manager Protocol in the Bluetooth protocol stack. The L2CAP layer provides connection-oriented and connectionless data services to upper layers. ▪ The four main tasks for L2CAP are: ▪ Multiplexing - L2CAP must support protocol multiplexing since a number of protocols (e.g. SDP, RFCOMM and TCS Binary) can operate over L2CAP. ▪ Segmentation and Reassembly - Data packets exceeding the Maximum Transmission Unit, MTU, must be segmented before being transmitted. This and the reverse functionality, reassemble, is performed by L2CAP. ▪ Quality of Service - The establishment of an L2CAP connection allows the exchange of information regarding current Quality of Service for the connection between the two Bluetooth units. ▪ Groups - The L2CAP specification supports the mapping of groups on to a piconet.

Protocols Used In Bluetooth. Service Discovery Protocol (SDP): ▪ The Service Disocvery Protocol defines how a client's Bluetooth enabled application will discover available Bluetooth server' services and characteristics upon entering a Bluetooth server area. ▪ SDP also provides functionality for detecting when a service is no longer available.

Protocols Used In Bluetooth. RFCOMM:  ▪ RFCOMM protocol is a serial port protocol.  ▪ The protocol covers applications that make use of serial ports of the unit.  ▪ RFCOMM emulates RS-232 control and data signals over the baseband.  ▪ It also provides capabilities for the upper service levels such as OBEX,  which uses a serial line as a transport mechanism.

Protocols Used In Bluetooth. Telephony control protocol: a. Telephony Control – Binary b.Telephony Control – AT Commands ▪Bit-oriented  protocol,  which  defines  the  call  control  signalling  for  the  establishment  of  speech  and  data  calls between Bluetooth units.  ▪Are supported for transmitting  control signals for telephony control.  ▪Provides  functionality  to  exchange  signalling  information  unrelated  to  ongoing calls.  ▪ITU-T Recommended. ▪These use the serial port emulation,  RFCOMM, for transmission.

Protocols Used In Bluetooth. Adopted protocols ▪  This  section  describes  a  number  of  protocols  that  are  defined  to  be  adopted to the Bluetooth protocol stack.  ▪ Note some of these adaptations are at the moment incomplete. a. Point-to-Point Protocol - PPP – Designed  to  run  over  RFCOMM  to  accomplish  point-to-point  connections. – packet-oriented  protocol  and  must  therefore  use  its  serial  mechanisms  to  convert  the  packet  data  stream  into  a  serial  data  streams.

Protocols Used In Bluetooth. Adopted protocols ▪ b. TCP/UDP/IP – Defined  to  operate  in  Bluetooth  units  allowing  them  to  communicate  with  other  units  connected,  for  instance,  to  the  Internet.  – Bluetooth can acts like a bridge to internet – The  TCP/IP/PPP  protocol  configuration  is  used  for  all  Internet  Bridge  usage  scenarios  in  Bluetooth  1.0  and  for  OBEX  in  future  versions.  – The UDP/IP/PPP configuration is available as transport for WAP.

Protocols Used In Bluetooth. Adopted protocols ▪ c. IrOBEX, shortly OBEX Protocol – Optional  application  layer  protocol  designed  to  enable  units  supporting  infrared  communication  to  exchange a  wide  variety  of  data and commands in a resource-sensitive standardized fashion. – Client-server  model  and  is  independent  of  the  transport  mechanism and transport API. – Defines a folder-listing object, which is used to browse the contents  of folders on remote device.  – RFCOMM is used as the main transport layer for OBEX.

Protocols Used In Bluetooth. Adopted protocols ▪ d. Wireless Application Protocol, WAP – wireless protocol specification that works across a variety of widearea wireless network technologies bringing the Internet to mobile  devices.  – Bluetooth can be used like other wireless networks with regard to  WAP,  it  can  be  used  to  provide  a  bearer  for  transporting  data  between the WAP Client and its adjacent WAP Server.  – Furthermore,  Bluetooth’s  ad  hoc  networking  capability  gives  a  WAP  client  unique  possibilities  regarding  mobility  compared  with  other WAP bearers.

Protocols Used In Bluetooth. Adopted protocols ▪ e. Content formats – Formats for transmitting vCard and vCalendar information are also  defined in the Bluetooth specification.  – The formats do not define transport mechanisms but the format in  which electronic business cards and personal calendar entries and  scheduling information are transported.  – vCard and vCalendar is transferred by OBEX.

Advantages And Disadvantages Bluetooth. Disadvantages Advantages ▪ Short ranged. ▪ Eliminates wires. ▪ Facilities data communication. and ▪ Standardized protocols. ▪ Free of charge. ▪ Easy to use. voice ▪ Less secured ▪ Interference devices. with other

Future Of Bluetooth. ▪ Very good future ahead as it need basic needs of connectivity. ▪ Latest versions are improving both in securities and capabilities. ▪ New versions will meet high speed and large range. ▪ Many companies are developing Bluetooth applications in demand.

Conclusion ▪ A new global standard for voice and data. ▪ Eliminates cables. ▪ Low power, low range, low cost network device. ▪ Further improvements are planned to made in – Data Rate. – Power Reduction – Range

Bibliography ▪ http:// www.tech.plym.ac.uk/dcee/postgrad/reference/BlueTooth/page2.html#architecture ▪ http://www.althos.com/tutorial/Bluetooth-tutorial-protocol-layers.html ▪ http://www.bluetooth.com/Pages/Bluetooth-Home.aspx ▪ www.palowireless.com/infotooth/tutorial.asp ▪ http://en.wikipedia.org/wiki/Bluetooth_protocols ▪ http://msdn.microsoft.com/en-us/library/ms890956.aspx ▪ http://www.thestudymaterial.com/presentation-seminar/electronicspresentation/51-bluetooth-technology.html?start=3 ▪ http://www.scribd.com/doc/135626916/Bluetooth-Protocol-Stack

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