8.81 EPS fallback status +CEPSFBS

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

Tools: ARFCN - Frequency Conversion for 5G NR/LTE/UMTS/GSM

Table 8.81-1: +CEPSFBS parameter command syntax

Command	Possible Response(s)
+CEPSFBS=[<reporting>]	+CME ERROR: <err>
+CEPSFBS?	+CEPSFBS: <reporting>[,<stat>,<type>]
+CEPSFBS=?	+CEPSFBS: (list of supported <reporting>s)

Description

The set command controls the presentation of an unsolicited result code +CEPSFBS: <stat>,<type> when <reporting>=1 and there is a change due to EPS fallback(EPSFB) procedure triggered by the network.

Read command returns <reporting> which indicates whether reporting of EPSFB status is enabled or disabled. When reporting is enabled, the parameters <stat> and <type> indicate the most recently received EPSFB status. When reporting is disabled, EPSFB status and EPSFB type are not provided.

The test command returns values supported as a compound value.

Defined values

<reporting>: integer type value. Disable and enable presentation of the unsolicited result code +CEPSFBS to the TE.

0 Disable EPSFBS unsolicited result code.

1 Enable EPSFBS unsolicited result code +CEPSFBS: <stat>,<type>.

<stat>: integer type; indicates the EPS fallback (EPSFB) status when MO/MT call is initated in 5GS.

0 5GS to EPS fallback started (applicable e.g. when handover (see NOTE 1) or redirection (see NOTE 2) is indicated by lower layers)

1 5GS to EPS fallback successful (applicable e.g. when change from 5GC to EPC is indicated by lower layers) (see NOTE 3)

2 5GS to EPS fallback failure (applicable e.g. when 5GS to EPS fallback was started but did not succeed in an implementation-specific time).

<type>: integer type; indicates the EPSFB type.

0 Handover (see NOTE 1)

1 Redirection (see NOTE 2)

NOTE 1: 3GPP TS 38.331 [160] specifies e.g. MobilityFromNRCommand.

NOTE 2: 3GPP TS 38.331 [160] specifies e.g. RRCRelease indicating redirection to eutra.

NOTE 3: 3GPP TS 36.331 [86] specifies e.g. RRCConnectionReconfiguration with handoverType set to fivegc-ToEPC.

Implementation

Optional. This command is only applicable to UEs supporting 5GS.