IEEE 802.15 <TG1a>

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Project IEEE P802.15 Working Group for Wireless
Personal Area Networks (WPANs) Submission Title
Bluetooth v1.2 Summary and TG1a Plans Date
Submitted 15 Sept 03 Source Tom Siep
Company TMS Consulting Address Suite 100, ms
365, 1802 Pleasant Valley Dr, Garland, TX, USA,
75040 Voice1 972 496 0766, FAX [phone]
1480, E-Mailtom.siep_at_ieee.org Re Original
Document Abstract Description of new
Bluetooth Spec version and the work to be done to
turn Bluetooth Specification 1.2 into
802.15.1a Purpose Background for creation of
802.15.1a Notice This document has been
prepared to assist the IEEE P802.15. It is
offered as a basis for discussion and is not
binding on the contributing individual(s) or
organization(s). The material in this document is
subject to change in form and content after
further study. The contributor(s) reserve(s) the
right to add, amend or withdraw material
contained herein. Release The contributor
acknowledges and accepts that this contribution
becomes the property of IEEE and may be made
publicly available by P802.15.
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Bluetooth v1.2 Summary and TG1a Plans

• Tom Siep
• TMS Consulting
• 15-03-0394-00-001a

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Overview

• What is happening to v1.1
• Summary of changes v1.1 ? v1.2
• Timeline for creation of 802.15.1a

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What is happening to v1.1

• Active investigation of possible enhancements and
  fixes for Bluetooth Spec for last 1.5 years
• Current SIG effort (v1.2) is a codification of
• Fixes
• Minor updates
• IEEE inputs
• Internal SIG approval process in progress
• Formal Reviews
• Interoperability testing of prototypes
• External review by IEEE now commencing

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Summary of changes

• Migration of 802-15-1-2002 (Bluetooth1.1) to
  Bluetooth Specification 1.2 (802-15-1revA-2004)
• Specifically this includes
• Format Changes
• Fixes to the Protocol
• New Features
• Architectural Overview
• Faster Connections
• Adaptive Frequency Hopping for improved
  coexistence
• Extended SCO
• Absence Masks
• Scatternet / Scattermode
• L2CAP Flow Error Control
• LMP Improvements / HCI Improvements
• Anonymity Mode

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Format Changes

• Type of changes
• New volume structure
• Cleaner formatting
• Genesis of changes
• IEEE Section ordering
• Draft 6 reorder rejected at the time
• Final 15.1 Structure
• IEEE drawings extended

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Fixes to 15.1 Protocol

• Errata from the SIG and IEEE applied
• Many SIG-generated errata entered and resolved
• Over 300 errata from IEEE process applied to new
  Spec
• Cleanup of nomenclature
• Specification changed to IEEE language
• Shall gt is required to
• Must gt is a natural consequence of
• Will gt it is true that
• Should gt is recommended that
• May gt is permitted to
• Can gt is able to

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Feature Architecture Overview

• Describes how Bluetooth fits together
• New first section in BT Spec that mirrors
  802.15.1
• Redefines terms, for example
• AM_ADDR becomes LTID (Logical Transport ID)
• L2CAP CID becomes LLID (Logical Link ID)
• Host Controller becomes Controller (Just like
  .15)
• Allows future specification versions to be more
  architecturally consistent

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Feature Architecture Diagram (old)
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Feature Architecture Diagram (new)
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Feature Faster Connections

• Faster Inquiry is done by
• Interlaced Scanning on both page trains
• Sending FHS packet on first ID packet and then
  randomly backing off
• Reduced MAX_RAND
• RSSI in Inquiry Results
• Profile Specific DIACs
• Faster Paging is done by
• Interlaced Scanning on both page trains

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Feature Faster Connections (contd)
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Feature Adaptive Frequency Hopping

• Defines a new hopping kernel which allows an
  arbitrary set of frequencies to be used
• Good channels are still used
• Bad channels are mapped onto good channels
• Same Channel used for Tx and Rx
• Channel Classification can be by Active or
  Passive means
• Specification gives example algorithms
• Subset of 802.15.2

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Feature Extended SCO (eSCO)

• Enhances Synchronous Connection-Oriented logical
  transport
• Adds EV3, EV4 and EV5 packet types
• EV3 HV3 CRC
• EV4 3 slot HV2 CRC
• EV5 3 slot HV3 CRC
• CRC allows retransmissions of corrupted EV
  packets
• Uses separate LTID (AM_ADDR)
• Separate LTID implies separate ARQ scheme

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Feature Scatternet / Scattermode

• Scatternet
• Relaxes requirements of a slave to allow them to
  listen to two masters. This is required for
  Scattermode to be entered into.
• Scattermode
• Defines periodic packets that shall be sent by
  the master of a piconet so that slaves can
  synchronize. These packets contain data flow
  information so that time listening on one piconet
  is optimized.

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Feature Absence Masks

• Define a period of time when a device will not be
  active in a piconet
• Only applies to low priority traffic like ACL
• SCO still works in absences
• Used to notify a third device about a commitment
  with a second device, regardless of roles

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Feature L2CAP Flow Error Control

• Segments SDUs into multiple PDUs
• Each has
• Sequence and Acknowledge numbers
• Different 16bit CRC to check data integrity
• Flow Control bits to control flow and
  retransmissions per LLID
• Two modes
• Retransmission Mode
• Flow Control Only

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QoS Clarification / Flow Spec

• Harmonizes the difference between L2CAP and HCI
  definitions of QoS
• Allows QoS to be defined in a bidirectional
  manner
• Redefines Flush Timeout as time from when a Data
  packet enters Controller and not when it is first
  transmitted
• A packet may never be transmitted if Flush
  Timeout is short and delay is long

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Feature LMP / HCI

• LMP adds 15 bit op-codes
• Adds a 15bit LMP Op-codes to allow more LMP
  commands to be defined. Clarifies the procedures
  when an unknown LMP Op-code is received.
• HCI Get LMP Handle
• Gets LMP SCO Handle for SCO Channels
• HCI Read Clock
• Reads Local or Remote BT Clock
• Returns Clock and Accuracy

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Feature Anonymity Mode

• Private Bluetooth Addresses
• BD_ADDR will become private information
• Page Scan and Inquiry Scan on a random public
  BD_ADDR which changes periodically
• Pairing done on Public Address
• Once link is encrypted, then private addresses
  can be exchanged
• Alias Authentication
• Need to authenticate with a network address not a
  public address. Single alias address for multiple
  devices.

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Timeline for creation of 802.15.1a