Sim Toolkit Application (STK)
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.
The Android STK implementation includes three layers:
- STK RIL: Low-level layer provided by the vendor plus
libril
. - STK Telephony: Protocol translation layer that converts raw messages provided by the STK RIL to application level messages.
- STK Application: Provides the user interface interactions needed by the STK.
The Sim Toolkit communication flow is bi-directional and commands can originate from the STK RIL
packaged in RIL_UNSOL_STK_PROACTIVE_COMMAND
, RIL_UNSOL_STK_EVENT_NOTIFY
, RIL_UNSOL_REFRESH
and RIL_UNSOL_STK_SESSION_END
messages.
Commands originating from the STK App or STK Telephony layers are packaged in RIL_REQUEST_STK_SEND_TERMINAL_REPSONSE
, RIL_REQUEST_SEND_ENVELOPE_COMMAND
or RIL_REQUEST_HANDLE_CALL_SETUP_REQUESTED_FROM_SIM
.
For commands sent or recieved by the STK RIL, it's not necessary to remove unused sub-commands because the upper layers will gracefully ignore unused information contained in the message. The content of each message is encoded in the BER-TLV format except for two:
RIL_UNSOL_STK_SESSION_END
: has no dataRIL_REQUEST_HANDLE_CALL_SETUP_REQUESTED_FROM_SIM
: has a single byte of data that indicates accept/reject.
See the Android Platform Development Kit for details.
Communication from the RIL up
Communication to the upper layers is done using the RIL_UNSOL_xxx
family of commands defined in /hardware/ril/include/ril.h
. The payload for each command is encoded using BER-TLV. As stated above, it is not necessary to remove extraneous fields. This allows the SIM to pass a complete command to the upper layers and simplifies STK RIL code. Below is the mapping from RIL_UNSOL_xxx commands to the SIM commands.
RIL_UNSOL_STK_PROACTIVE_COMMAND
The Sim Toolkit communication flow is bi-directional and commands can originate from the STK RIL
packaged in RIL_UNSOL_STK_PROACTIVE_COMMAND
, RIL_UNSOL_STK_EVENT_NOTIFY
, RIL_UNSOL_REFRESH
and RIL_UNSOL_STK_SESSION_END
messages.
DISPLAY TEXT (6.4.1)
This command is handled by StkDialogActivity
. If the immediate response flag is set, the terminal response is sent with an "OK" (0x00)
result code when the message is first received. Otherwise the terminal response is sent when the dialog is dismissed either from user action or it times out.
The user sees a dialog box with a message and / or icon, an OK button, and a Cancel button.
Terminal responses include:
- "OK" (0x00)
- "Session terminated by user" (0x10)
- "Backward move by user" (0x11)
- "No response from user" (0x12)
GET IN KEY (6.4.2)
This command is processed by StkInputActivity
. It displays a dialog box with a prompt and or an icon and yes and no buttons.
Terminal responses include:
- “OK” (0x00) with “Yes” or “No” as the response text
- “Session terminated by user” (0x10) << Currently not supported
- “Backward move by user” (0x11)
- “No response from user” (0x12)
GET INPUT (6.4.3)
This command is handled by StkInputActivity
.
The user sees a dialog box with a prompt and / or an icon, a text box with optional default text, and an OK button. 'digits only,' 'min,' 'max,' and 'hidden' modes are all supported.
Terminal responses include:
- OK” (0x00) if the input criteria is met
- “Session terminated by user” (0x10) << Currently not supported
- “Backward move by user” (0x11)
- “No response from user” (0x12)
PLAY TONE (6.4.5)
This command is processed by ToneDialog
.
The user sees a dialog box with a prompt for the duration of the tone or until the user presses the back key.
Terminal responses include:
- "OK" (0x00) if the tone is played to completion
- “Session terminated by user” (0x10) if back button is pressed
SET UP MENU (6.4.8)
This command is processed by StkAppService
. It installs the STK ICON on the home page and prepares the Main menu for use when the ICON is selected. Typically this is the first RIL unsolicited command and should not be sent until after the RIL_RadioFunctions.getVersion
routine is called.
Terminal reponses:
- “OK” (0x00)
At a later time, the STK ICON will be selected and StkMenuActivity
will launch and display the Main menu to the user. If an item is selected, it will be returned to the RIL in RIL_REQUEST_STK_SEND_ENVELOPE_COMMAND
with the item id. If no item is selected, the StkMenuActivity
will receive a timeout message and return to the Main menu and no message will be sent to the RIL.
Depending upon what item is selected, the SIM may perform another action, such as sending another set of menu items via a SELECT ITEM command or performing an action like send an SMS or text display.
SELECT ITEM (6.4.9)
This command is processed by StkMenuActivity
. Instead of displaying the Main menu, the list of menu items provided in this command are displayed.
Terminal responses:
- “OK” (0x00)
The command then proceeds as in the SETUP MENU.
SET UP IDLE MODE TEXT (6.4.22)
StkAppService
displays the message and or icon as an Android notification.
Terminal responses include:
- OK” (0x00)
LAUNCH BROWSER (6.4.26)
This command is initially handled by StkDialogActivity
and presents the user with a confirmation dialog, a URL, and OK, and cancel buttons. If the user presses OK, the browser is launched using the URL.
Terminal responses include:
- “OK” (0x00) the browser has been launched
- “Session terminated by user” (0x10)
- “Backward move by user” (0x11)
- “No response from user” (0x12)
RIL_UNSOL_STK_EVENT_NOTIFY
The commands in this section are proactive in nature. They are handled by the STK RIL and the upper layers and delivered using RIL_UNSOL_STK_EVENT_NOTIFY
message. This distinction is an implementation detail of Android and is not defined in the 3GPP sepcifications.
The upper layers handle the UI and the STK RIL handles all other aspects of each command, which means that the STK RIL sends the terminal response (it is never sent by the STK App). Each command must be a properlery-formed proactive command. It is not necessary to remove unused fields. The behavior of any other command within this context sent by RIL_UNSOL_STK_EVENT_NOTIFY
is undefined. See Event Notify Command Details.
- SEND SMS (6.4.10) – no response
- SEND SS (6.4.11) – no response
- SEND USSD (6.4.12) – no response
- SET UP CALL (6.4.13) – responds with
RIL_REQUEST_STK_HANDLE_CALL_SETUP_REQUESTED_FROM_SIM
- SEND DTMF (6.4.24) – no response
RIL_UNSOL_SIM_REFRESH
Used to send the REFRESH
command. No response.
REFRESH (6.4.7)
RIL_UNSOL_STK_SESSION_END
Sent by the SIM to signal the end of a session. No content and no response.
RIL_UNSOL_STK_SESSION_END
Sent by SIM to signal end of session. No content and no response.
Communication from the application down
Communication from the upper layers to the RIL uses the commands below (defined in ril.h
):
RIL_REQUEST_STK_SEND_TERMINAL_REPSONSE
Used to send a terminal response for commands sent via RIL_UNSOL_STK_PROACTIVE_COMMAND
.
Contents include TERMINAL RESPONSE (6.8).
RIL_REQUEST_STK_SEND_ENVELOPE_COMMAND
Used to send information from to SIM encoded as BER-TLV tags (see R96 section 13). Two tags are supported:
- BER_MENU_SELECTION_TAG (0xd3); Contents: MENU SELECTION (8)
- BER_EVENT_DOWNLOAD_TAG (0xd6); Contents: EVENT DOWNLOAD Language selection (11.8)
Content for these tags include:
- MENU SELECTION (8)
- EVENT DOWNLOAD Language selection (11.8)
RIL_REQUEST_HANDLE_CALL_SETUP_REQUESTED_FROM_SIM
Returns a single-byte parameter:
- 1: accepted
- 0: not accepted
This should cause the terminal response to be sent to the SIM.
Telephony
STK Telephony is a protocol translation layer used to convert messages from BERL-TLV format to Application messages and back.
On the STK RIL side, STK Telphony receives raw buffer messages from RIL I/F and decodes them into a command parameters container before passing them on to the application. On the Application side, this layer receives application responses for commands and encodes them into raw buffer messages, which then get sent over the RIL I/F back to the SIM card.
Feature List
Feature
Support
Implemented by
PROFILE DOWNLOAD - before radio turn-on
YES
Baseband
SET UP MENU
YES
ME
SELECT ITEM
YES
ME
GET INPUT
YES
ME
GET INKEY
YES
ME
DISPLAY TEXT
YES
ME
SET UP IDLE MODE TEXT
YES
ME
SEND SHORT MESSAGE
YES
Baseband – ME
SEND SS
YES
Baseband – ME
SEND USSD
YES
Baseband – ME
SEND DTMF
YES
Baseband – ME
LAUNCH BROWSER
YES
ME
SET UP CALL
YES
Baseband – ME
PLAY TONE
YES
ME
POLL INTERVAL
YES
Baseband
POLLING OFF
YES
Baseband
TIMER MANAGEMENT
YES
Baseband
MORE TIME
YES
Baseband
PROVIDE LOCAL INFORMATION (MCC, MNC, LAC, Cell ID & IMEI)
YES
Baseband
PROVIDE LOCAL INFORMATION (NMR)
YES
Baseband
PROVIDE LOCAL INFORMATION (Timing Advance)
YES
Baseband
PROVIDE LOCAL INFORMATION(battery state)
YES
Baseband
PROVIDE LOCAL INFORMATION (IMEISV)
YES
Baseband
PROVIDE LOCAL INFORMATION (NMR(UTRAN))
YES
Baseband
PROVIDE LOCAL INFORMATION (Search Mode change)
YES
Baseband
REFRESH
YES
ME
SET UP EVENT LIST
YES
Baseband – ME
Event: MT call
YES
Baseband
Event: Call connected (all modes)
YES
Baseband
Event: Call disconnected (all modes)
YES
Baseband
Event: Idle screen available
NO
Event: Browser termination
NO
Event: Location status
YES
Baseband
Event: Data available
NO
Event: Channel status
NO
Event: Access Technology changed
YES
Baseband
Event: Local Connection
NO
Event: Network Search Mode Change
YES
Baseband
GET READER STATUS
NO
POWER ON CARD
NO
POWER OFF CARD
NO
PERFORM CARD ADPU
NO
RUN AT COMMAND
NO
OPEN CHANNEL
NO
CLOSE CHANNEL
NO
RECEIVE DATA
NO
SEND DATA
NO
GET CHANNEL STATUS
NO
CALL CONTROL BY SIM
YES
Baseband
SMS-PP data download
YES
Baseband
SMS-CB data download
YES
Baseband
BIP over GPRS
NO
BIP over USB
NO
Text Attributes
NO
Color icons
YES
ME
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