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HF

VIEWS: 3 PAGES: 44

									HandsFree Profile (HFP)



         2009. 07. 21

     통신연구소 S/W Team 이상제
Table of contents



      3
      1    Preface

      2   Configuration and Roles

      3    Protocol Stack

      4   ACL link and SCO link

      3
      5    Headset Profile

      6   Application layer(HFP)
Preface

• What is Profile?
   – Describe how implementations of user models are to be
     accomplished.
   – Decrease the risk of interoperability problems between
     different manufacturers' products.
 Preface

• What is HFP?
  – Defines the minimum set
    of functions such that a
    Mobile Phone can be
    used in conjunction with
    a Hands-Free device
  – Remote control of the
    Mobile Phone by the
    Hands-Free device
  – Voice connections
    between the Mobile
    Phone and the Hands-
    Free device.
Configuration and Roles




• Audio Gateway (AG)
    – Gateway of the audio, both for input and output.


• Hands-Free unit (HF)
    – Acting as the Audio Gateway’s remote audio input and
      output mechanism. It also provides some remote control
      means.
Protocol Stack




                 OSI Physical layer and
                 Data link layer Bluetooth
                 protocols.
Protocol Stack




                 RFCOMM is the Bluetooth
                 serial port emulation entity
Protocol Stack




                 Bluetooth Service
                 Discovery Protocol
Protocol Stack




                 Responsible for Hands-
                 Free unit specific control
                 signaling; this signaling is
                 AT command based.
Protocol Stack
SCO link and ACL link

• SCO (Synchronous Connection Oriented)
   – Point-to-point link between the master and a specific slave
   – Typically supports time-bounded information like voice

• ACL (Asynchronous Connectionless)
   – point-to-multipoint link between the master and all the
     slaves participating on the piconet
   – Both asynchronous and isochronous services are supported
Headset Profile

• What is deferent of HFP and HSP




                         <HSP Application layer>




              Headset                    Hands Free
               Profile
                                           Profile
Application layer(HFP)
Application layer(HFP)
Application layer

Feature                                               HF    AG
1. Connection Management                              M     M

• Service Level Connection establishment
    – Pre-condition: RFCOMM connection establishment
    – Service Level Connection Initialization
    – Link Loss Recovery


• Service Level Connection release
    – Pre-condition: Established Service Level Connection
Application layer




                                            The HF notifies the AG
                                           about its own supported
                                                    features
                                                      and
                                            the AG responds with
                                            its supported features




  Service Level Connection establishment
Application layer




                                                The HF retrieves
                                           the information describing
                                                  the indicators
                                              supported in the AG




  Service Level Connection establishment
Application layer




                                               The HF requests
                                             the current status of
                                           the indicators in the AG




  Service Level Connection establishment
Application layer




                                              The HF requests
                                           enabling Indicator Status
                                              update in the AG




  Service Level Connection establishment
Application layer




                                                The HF retrieves
                                           the information describing
                                                the call hold and
                                               multiparty services
                                              supported in the AG




  Service Level Connection establishment
    Application layer

    Feature                                                    HF        AG
    2. Phone status information                                M         M

       Registration Status                  Signal Strength Indication



                                                    Roaming Status Indication
Report Extended
Audio Gateway                   Status
Error Results Code           information
                                                     Battery Level
                                                     Indication of AG
     Transfer of
     Call,
     Call Setup ,
     Held Call Status                       Query Operator Selection


           At least the two indicators “service” and “call”.
Application layer

Feature                                              HF     AG
3. Audio Connection handling                         M      M

• Audio Connection set up
    – Pre-condition: Established Service Level Connection
    – HF or the AG initiate the establishment of an Audio
      Connection.
    – Always Synchronous Connection

• Audio Connection release
    – Pre-condition: Established Audio Connection
    – Disconnection of its corresponding Synchronous
      Connection.
    – When the audio connection is released, the audio path shall
      be routed to the AG.
Application layer

Feature                                                     HF     AG
4. Accept an incoming voice call                            M      M

• Answer an incoming call
    – Answer Incoming Call from the HF – In-Band Ringing
          • Pre-condition : Established Service Level Connection

    – Answer Incoming Call from the HF – No In-Band Ringing
          • Pre-condition : Established Service Level Connection
            (or optionally an Audio Connection)

    – Answer Incoming Call from the AG
          • Pre-condition : AG is alerting the HF

    – Change the In-Band Ring Tone Setting
          • Pre-condition : Established Service Level Connection
Application layer

Feature                                                      HF             AG
4. Accept an incoming voice call                             M              M




        Answer an incoming call             Answer an incoming call
     from the HF – in-band ring tone   from the HF – no in-band ring tone
Application layer

Feature                                               HF     AG
5. Reject an incoming voice call                      M      O

• Reject an incoming call
    – Reject an Incoming Call from the HF
          • Pre-condition : AG is alerting the HF

    – Rejection/Interruption of an Incoming Call in the AG
          • Pre-condition : AG is alerting the HF
Application layer

Feature                                            HF   AG
6. Terminate a call                                M    M

• Terminate a Call Process from the HF
    – Pre-condition
          • Established Service Level Connection
          • Ongoing call process


• Terminate a Call Process from the AG
    – Pre-condition
          • Established Service Level Connection
          • Ongoing call process
Application layer

Feature                                                      HF         AG
7. Audio Connection transfer during an ongoing call          M          M

• Audio Connection transfer towards the HF
    – Pre-condition
          • Established Service Level Connection
          • The audio paths of the ongoing call are available at the AG
                                                      A
                                                                   HF
                                                      G

• Audio Connection transfer towards the AG
    – Pre-condition
          • Established Service Level Connection
          • Ongoing call process with the audio paths routed towards the HF
                                                                    A
                                                      HF
                                                                    G
Application layer

Feature                                                      HF       AG
8. Place a call with a phone number supplied by the          O        M
HF
• Place a call with a phone number supplied by the HF
    – Pre-condition
          • Established Service Level Connection
            (or optionally an Audio Connection)
          • The audio paths of the ongoing call are available at the HF
    - Initiate outgoing voice calls by providing the destination
       phone number to the AG.
Application layer

Feature                                               HF      AG
9. Place a call using memory dialing                  O       M

• Memory Dialing from the HF
    – Pre-condition : Established Service Level Connection
      (or optionally an Audio Connection)
    – Initiate outgoing voice calls using the memory dialing feature
      of the AG
Application layer

Feature                                                HF      AG
10. Place a call to the last number dialed             O       M

• Last Number Re-Dial from the HF
    – Pre-condition : Established Service Level Connection
      (or optionally an Audio Connection)
    – initiate outgoing voice calls by recalling the last number
      dialed by the AG.
Application layer

Feature                                                       HF       AG
11. Call waiting notification                                 O        M

• Call Waiting Notification Activation
    – Pre-condition
          • Established Service Level Connection
          • Internal event or user requested: Enable Call Waiting notification
    – The HF requests enabling Call Waiting notification indication
Application layer

Feature                                                                      HF    AG
12. Three way calling                                                        O     O

• Call Waiting Notification




                        0 = Releases all held calls or sets User Determined
                            User Busy (UDUB) for a waiting call.
                        1 = Releases all active calls (if any exist) and accepts
                            the other (held or waiting) call.
                        2 = Places all active calls (if any exist) on hold and
                            accepts the other (held or waiting) call.
                        3 = Adds a held call to the conversation.
                        4 = Connects the two calls and disconnects the
                            subscriber from both calls (Explicit Call Transfer).
                            Support for this value and its associated
                            functionality is optional for the HF.
Application layer

Feature                                 HF   AG
12. Three way calling                   O    O

• Third Party Call Placed from the HF
Application layer

Feature                                                       HF        AG
13. Calling Line Identification(CLI)                          O         O

• Calling Line Identification (CLI) Notification
    – Pre-condition
          • Established Service Level Connection
          • Internal event or user requested: Enable CLI notification
Application layer

Feature                                             HF       AG
14. Echo canceling(EC) and noise reduction(NR)      O        O

• The HF Requests Turning Off the AG’s EC and NR
    – Pre-condition : Established Service Level Connection


• If the HF has embedded EC and/or NR functions
  enabled, it shall perform this procedure before any
  Audio Connection between the HF and the AG is
  established.
Application layer

Feature                                                     HF      AG
15. Voice recognition activation                            O       O

• Voice Recognition Activation
    – Pre-condition
          • Established Service Level Connection(or optionally an Audio
            Connection)
    – Voice Recognition Activation – HF Initiated
    – Voice Recognition Activation – AG Initiated

• Voice Recognition Deactivation
    – Pre-condition
          • Established Service Level Connection
          • Voice recognition is enabled
    – Voice recognition deactivation from the HF
    – Voice recognition deactivation from the AG
Application layer

Feature                                              HF      AG
16. Attach a Phone number to a voice tag             O       O

• Attach a Phone Number to a Voice Tag
    – read numbers from the AG for the purpose of creating a
      unique voice tag and storing the number and its linked voice
      tag in the HF unit’s memory.




                                                       User Insert
   Store The Voice                                    Phone number
   Tag and Phone
       Number
Application layer

Feature                                            HF   AG
17. Ability to transmit DTMF codes                 O    M

• Transmit DTMF Codes
    – Pre-condition :
          • Established Service Level Connection
          • An ongoing call in the AG exists
Application layer

Feature                                                       HF       AG
18. Remote audio volume control                               O        O

• Audio Volume Control
    – Enables the user to modify the speaker volume and
      microphone gain of the HF from the AG
          • On a scale from 0 to 15                      AG            HF
          • The values are absolute values
          • Relate to a particular volume level controlled by the HF


• Volume Level Synchronization
    – This procedure allows the HF to inform the AG of the current
      gain settings corresponding to the HF’s speaker volume and
      microphone gain.
                                                        HF             AG
Application layer

Feature                                       HF   AG
19. Respond and Hold                          O    O

•   Query Response and Hold Status
•   Put an Incoming Call on Hold from HF
•   Put an Incoming Call on Hold from AG
•   Accept a Held Incoming Call from HF
•   Accept a Held Incoming Call from AG
•   Reject a Held Incoming Call from HF
•   Reject a Held Incoming Call from AG
•   Held Incoming Call Terminated by Caller
Application layer

Feature                                              HF         AG
19. Respond and Hold                                 O          O




                       AT+BTRH? (Read Current Status)
                       AT+BTRH=<n> (Set command)
                       0 = Put Incoming call on hold
                       1 = Accept a held incoming call
                       2 = Reject a held incoming call

                       +BTRH: <n> (Response for AT+BTRH)
                       0 = Incoming call is put on hold in the AG
                       1 = Held incoming call is accepted in the AG
                       2 = Held incoming call is rejected in the AG
Application layer

Feature                                             HF      AG
20. Subscriber Number Information                   O       M

• HF to query the AG subscriber number
    – Pre-condition: Established Service Level Connection
    – AG response to the query of Empty, One or multiple
      subscriber number
Application layer

Feature                                                         HF         AG
21a. Enhanced Call Status                                       O          M

• Query List of Current Calls in AG
    – Pre-condition: Established Service Level Connection

• Indication of Status for Held Calls
    – Pre-condition
          • Established Service Level Connection
          • The HF shall have enabled the Call Status Indicators function in
            the AG
    – Values for the callheld indicator
          • 0= No calls held
          • 1= Call is placed on hold or active/held calls swapped
               (The AG has both and active AND a held call)
          • 2= Call on hold, no active call (terminate active call only)
Application layer

Feature                                               HF   AG
21b. Enhanced Call Controls                           O    O

• Release Specified Call Index
    – Pre-condition
          • Established Service Level Connection
          • Existing call


• Private Consultation Mode
    – Pre-condition
          • Established Service Level Connection
          • Existing multiparty call
    – Place all calls on hold EXCEPT the call indicated.

								
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