8.45 Open logical channel +CCHO

27.0073GPPAT command set for User Equipment (UE)Release 18TS

Table 105: +CCHO action command syntax

Command	Possible response(s)
+CCHO=<dfname>	<sessionid> +CME ERROR: <err>
+CCHO=?

Description

Execution of the command causes the MT to return <sessionid> to allow the TE to identify a channel that is being allocated by the currently selected UICC, which is attached to ME. The currently selected UICC will open a new logical channel; select the application identified by the <dfname> received with this command and return a session Id as the response. The ME shall restrict the communication between the TE and the UICC to this logical channel.

This <sessionid> is to be used when sending commands with Restricted UICC Logical Channel access +CRLA or Generic UICC Logical Channel access +CGLA commands.

NOTE: The logical channel number is contained in the CLASS byte of an APDU command, thus implicitly contained in all APDU commands sent to a UICC. In this case it will be up to the MT to manage the logical channel part of the APDU CLASS byte and to ensure that the chosen logical channel is relevant to the <sessionid> indicated in the AT command. See 3GPP TS 31.101 [65] for further information on logical channels in APDU commands protocol.

Refer clause 9.2 for possible <err> values.

Defined values

<dfname>: all selectable applications in the UICC are referenced by a DF name coded on 1 to 16 bytes

<sessionid>: integer type; a session Id to be used in order to target a specific application on the smart card (e.g. (U)SIM, WIM, ISIM) using logical channels mechanism

See 3GPP TS 31.101 [65] for more information about defined values.

Implementation

Optional.