HandsFree Profile (HFP)
2009. 07. 21
통신연구소 S/W Team 이상제
Table of contents
Configuration and Roles
2
Application layer(HFP)
6
Preface
3
1
Protocol Stack
3
3
Headset Profile
3
5
ACL link and SCO link
4
•What is Profile?
–Describe how implementations of user models are to beaccomplished.
–Decrease the risk of interoperability problems betweendifferent manufacturers' products.
Preface
Preface
•What is HFP?
–Defines the minimum setof functions such that aMobile Phone can beused in conjunction with aHands-Free device
–Remote control of theMobile Phone by theHands-Free device
–Voice connectionsbetween the MobilePhone 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 outputmechanism. It also provides some remote control means.
Protocol Stack
OSI Physical layer andData link layer Bluetoothprotocols.
Protocol Stack
RFCOMM is the Bluetoothserial port emulation entity
Protocol Stack
Bluetooth ServiceDiscovery Protocol
Protocol Stack
Responsible for Hands-Free unit specific controlsignaling; this signaling isAT command based.
Protocol Stack
•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 slavesparticipating on the piconet
–Both asynchronous and isochronous services are supported
SCO link and ACL link
Hands Free
Profile
•What is deferent of HFP and HSP
Headset Profile
Headset
Profile
<HSP Application layer>
Application layer(HFP)
Application layer(HFP)
•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
Feature
HF
AG
1. Connection Management
M
M
Service Level Connection establishment
Application layer
The HF notifies the AGabout its own supportedfeaturesandthe AG responds withits supported features
Service Level Connection establishment
Application layer
The HF retrievesthe information describingthe indicatorssupported in the AG
Service Level Connection establishment
Application layer
The HF requeststhe current status ofthe indicators in the AG
Service Level Connection establishment
Application layer
The HF requests
enabling Indicator Statusupdate in the AG
Service Level Connection establishment
Application layer
The HF retrieves
the information describingthe call hold and
multiparty servicessupported in the AG
At least the two indicators “service” and “call”.
Application layer
Feature
HF
AG
2. Phone status information
M
M
Status
information
Signal Strength Indication
Registration Status
Roaming Status Indication
Query Operator Selection
Report Extended
Audio Gateway
Error Results Code
Transfer of
Call,
Call Setup ,
Held Call Status
Battery LevelIndication of AG
•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 berouted to the AG.
Application layer
Feature
HF
AG
3. Audio Connection handling
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
Application layer
Feature
HF
AG
4. Accept an incoming voice call
M
M
Answer an incoming call
from the HF – in-band ring tone
Answer an incoming call
from the HF – no in-band ring tone
•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
5. Reject an incoming voice call
M
O
•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
6. Terminate a 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
•Audio Connection transfer towards the AG
–Pre-condition
•Established Service Level Connection
•Ongoing call process with the audio paths routed towards the HF
Application layer
Feature
HF
AG
7. Audio Connection transfer during an ongoing call
M
M
AG
HF
HF
AG
•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 phonenumber to the AG.
Application layer
Feature
HF
AG
8. Place a call with a phone number supplied by the HF
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 ofthe AG
Application layer
Feature
HF
AG
9. Place a call using memory dialing
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 bythe AG.
Application layer
Feature
HF
AG
10. Place a call to the last number dialed
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
11. Call waiting notification
O
M
•Call Waiting Notification
Application layer
Feature
HF
AG
12. Three way calling
O
O
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.
•Third Party Call Placed from the HF
Application layer
Feature
HF
AG
12. Three way calling
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
13. Calling Line Identification(CLI)
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 functionsenabled, it shall perform this procedure before any AudioConnection between the HF and the AG is established.
Application layer
Feature
HF
AG
14. Echo canceling(EC) and noise reduction(NR)
O
O
Application layer
Feature
HF
AG
15. Voice recognition activation
O
O
•Voice Recognition Activation
–Pre-condition
•Established Service Level Connection(or optionally an AudioConnection)
–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 uniquevoice tag and storing the number and its linked voice tag in theHF unit’s memory.
User InsertPhone number
Store The VoiceTag and PhoneNumber
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 microphonegain 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 currentgain settings corresponding to the HF’s speaker volume andmicrophone gain.
AG
HF
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 subscribernumber
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 theAG
–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.