HandsFree Profile (HFP)

1. HandsFree Profile (HFP) 2009. 07. 21 통신연구소 S/W Team 이상제

2. 3 3 3 Preface 1 3 5 Configuration and Roles ACL link and SCO link 2 4 Protocol Stack Headset Profile Application layer(HFP) 6 Table of contents

3. Preface • What is Profile? • Describe how implementations of user models are to be accomplished. • Decrease the risk of interoperability problems between different manufacturers' products. *&$(&^ ?????

4. 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.

5. 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.

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

7. Protocol Stack RFCOMM is the Bluetooth serial port emulation entity

8. Protocol Stack Bluetooth Service Discovery Protocol

9. Protocol Stack Responsible for Hands-Free unit specific control signaling; this signaling is AT command based.

10. Protocol Stack

11. 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

12. Headset Profile • What is deferent of HFP and HSP Headset Profile <HSP Application layer> Hands Free Profile

13. Application layer(HFP)

14. Application layer(HFP)

15. Application layer • 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

16. Application layer The HF notifies the AG about its own supported features and the AG responds with its supported features Service Level Connection establishment

17. Application layer The HF retrieves the information describing the indicatorssupported in the AG Service Level Connection establishment

18. Application layer The HF requests the current status of the indicators in the AG Service Level Connection establishment

19. Application layer The HF requests enabling Indicator Status update in the AG Service Level Connection establishment

20. Application layer The HF retrieves the information describing the call hold and multiparty services supported in the AG Service Level Connection establishment

21. Application layer • At least the two indicators “service” and “call”. Registration Status Signal Strength Indication Roaming Status Indication Report Extended Audio Gateway Error Results Code Status information Battery Level Indication of AG Transfer of Call, Call Setup , Held Call Status Query Operator Selection

22. Application layer • 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.

23. Application layer • 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

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

25. Application layer • 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

26. Application layer • 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

27. Application layer • Audio Connection transfer towards the HF • Pre-condition • Established Service Level Connection • The audio paths of the ongoing call are available at the AG • Audio Connection transfer towards the AG • Pre-condition • Established Service Level Connection • Ongoing call process with the audio paths routed towards the HF AG HF HF AG

28. Application layer • 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.

29. Application layer • 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

30. Application layer • 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.

31. Application layer • 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

32. Application layer • 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.

33. Application layer • Third Party Call Placed from the HF

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

35. Application layer • The HF Requests Turning Off the AG’s ECand 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.

36. Application layer • 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

37. Application layer • 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 Phone number Store The Voice Tag and Phone Number

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

39. Application layer • 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 • 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. AG HF HF AG

40. Application layer • 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

41. Application layer 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

42. Application layer • 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

43. Application layer • 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)

44. Application layer • 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.