NB-IoT Module Series
BC26 AT Commands Manual
BC26_AT_Commands_Manual 16 / 73
2.8. AT+CEREG EPS Network Registration Status
The set command controls the presentation of an unsolicited result code (URC) “+CEREG:<stat>” when
<n>=1 and there is a change in the MT's EPS network registration status in E-UTRAN, or unsolicited
result code “+CEREG:<stat>[,[<tac>],[<ci>],[<AcT>]]” when <n>=2 and there is a change of the network
cell in E-UTRAN. The parameters <AcT>, <tac> and <ci> are provided only if available. The value <n>=3
further extends the unsolicited result code with [,<cause_type>,<reject_cause>], when available, when
the value of <stat> changes.
If the UE requests PSM for reducing its power consumption, the set command controls the presentation of
an unsolicited result code: “+CEREG:<stat>[,[<tac>],[<ci>],[<AcT>][,[<cause_type>],[<reject_cause>][,
[<Active-Time>],[<Periodic-
TAU>]]]]”.
When <n>=4, the unsolicited result code will provide the UE with additional information for the active time
value and the extended periodic TAU value if there is a change of the network cell in E-UTRAN. The value
<n>=5 further enhances the unsolicited result code with <cause_type> and <reject_cause> when the
value of <stat> changes. The parameters <AcT>, <tac>, <ci>, <cause_type>, <reject_cause>,
<Active-Time> and <Periodic-TAU> are provided only if available.
The read command returns the status of result code presentation and an integer <stat> which shows
whether the network has currently indicated the registration of the MT. Location information elements
<tac>, <ci> and <AcT>, if available, are returned only when <n>=2 and MT is registered on the network.
The parameters [,<cause_type>,<reject_cause>], if available, are returned when <n>=3.
The test command returns supported parameter values.
AT+CEREG EPS Network Registration Status
Write Command
AT+CEREG=[<n>]
Response
OK
If there is any error, response:
+CME ERROR:<err>
Read Command
AT+CEREG?
Response
When <n>=0, 1, 2 or 3 and command is executed
successfully:
+CEREG:<n>,<stat>[,[<tac>],[<ci>],[<AcT>[,<cause_type>
,<reject_ cause>]]]
When <n>=4 or 5 and command is executed successfully:
+CEREG:<n>,<stat>[,[<lac>],[<ci>],[<AcT>],[<rac>][,[<cau
se_type>],[<reject_cause>][,[<Active-Time>],[<Periodic-T
AU>]]]]
