Network service

Returns the MSISDNs related to this subscriber. If the subscriber has different MSISDN for different services, each MSISDN is returned in a separate line.

Returns the radio signal strength <signal_power> and <qual> from the MT.

In dedicated mode, during the radio channel reconfiguration (e.g. handover), invalid measurements may be returned for a short transitory because the MT must compute them on the newly assigned channel.

Returns the received signal quality and level:

Controls the extended signal change quality event reporting.

The set command forces an attempt to select and register with the LTE network operator, which can be chosen in the list of network operators returned by the test command, which triggers a PLMN scan on all supported bands. Through the <mode> parameter the network selection can be automatically performed by the module or manually forced on a specified network operator.

By default, u-blox cellular modules support auto-registration, therefore AT+COPS=0 or AT+COPS=1 commands are not required at switch on: for more details, see Auto-registration.

The command is accessible also without an inserted SIM. The PIN insertion is required only for AT+COPS=2 command: if the PIN is not inserted, AT+COPS=2 returns the "+CME ERROR: SIM Failure" error result code. The <mode> parameter value is correctly returned by the read command only after the SIM initialization.

The set command handling depends on the <mode> parameter value (for more details on the <mode> parameter allowed values, see Defined values):

The response time for the set and read command is immediate. The user shall not rely on the set command "OK" final result code as a confirmation that the network selection has been performed. To determine the current network registration status the following AT commands shall be used:

Only numeric <format> is supported. Alphanumeric format can be selected but, given that +COPN is not supported, no PLMN name string will be returned by the test AT command; the read AT command returns the PLMN name in alphanumeric format only if it has been received via NITZ (Network Identity and Time Zone) Information during the registration.

User reselection (see 3GPP TS 23.122 [20]) can be triggered in +COPS: 0 with +UUSERSCAN AT command.

The AT+COPS=1,<format>,<oper> command forces the MT to select and register with the network even if the operator currently belongs to the list of the Forbidden Public Land Mobile Networks (FPLMNs).

PLMN manual mode exception (see 3GPP TS 23.122 [20] subclause 4.4.3.1) is supported: this feature allows manual selection of the HPLMN or an EHPLMNs when the selected PLMN is not available.

The test command cannot be aborted. In case the PLMN scan is interrupted e.g. by a deregistration procedure, the command will return the partial PLMN scan results.

The PLMN scan can be triggered in deregistered state (+COPS: 2) as well as in minimum functionality states (+CFUN: 0/+CFUN: 4/+CFUN: 19).

The PLMN scan can be triggered during a RRC connection, which is temporarily released by the module and re-established at the end of the the network search in case of pending data.

The user should not enter colliding requests (e.g. AT+COPS=0 and AT+COPS=2) on different communication ports, because this might cause interoperability issues if overlapping registration and deregistration requests are not handled by the network, and could result in an unpredictable registration state. Similarly, when notified of a mobile terminated detach event (e.g. via +CGEV URC), it is recommended to wait a few seconds before entering AT+COPS=2 in order to let the pending registration procedure (automatically triggered by the module in most cases) successfully end.

Executes the user PLMN reselection process, by triggering a search for higher priority PLMNs. If no higher priority PLMN is found, the module remains in the state it was before the search (see the 3GPP TS 23.122 [20] subclause 4.4.3.2).

If a PLMN scan is already in progress, the command will return an error result code.

This command is effective only if the PLMN selection mode is set to automatic mode, i.e. in +COPS: 0, the SIM is present and PIN is inserted (if enabled).

Performs an extended network search on the provided radio access technology (RAT). The network search is performed on all the supported bands or only on a subset specified by the <bitmask_1_64> and <bitmask_65_127> parameters. All the cells detected during the PLMN search are reported at the AT interface:

Sets the MAC QoS inactivity timer for LTE RAT. This timer is a cellular platform proprietary guard timer that is restarted for any received or transmitted packet. If the timer expires, the RRC connection is locally released and re-established to perform a Tracking Area Update indicating no pending data, after which the network will immediately release the RRC connection.

Causes the UE to immediately release the RRC connection locally and then re-establish it, allowing the network to subsequently release it cleanly by sending an RRC Connection Release message to the module.

Selects one PLMN selector with Access Technology list in the SIM card or active application in the UICC (GSM or USIM), that is used by +CPOL command.

The set command selects a list in the SIM/USIM. The read command returns the selected PLMN selector list from the SIM/USIM.

The test command returns the whole index range supported lists by the SIM/USIM.

Configures the network registration URC related to CS (circuit-switched) domain. Depending on the <n> parameter value, a URC can be issued:

The parameters <lac>, <ci>, <AcTStatus>, <cause_type> and <reject_cause> are provided only if available.

The read command provides the same information issued by the URC together with the current value of the <n> mode configuration parameter. It returns at least the mode configuration (<n>) and the network registration status (<stat>). The location information elements <lac>, <ci> and <AcTStatus>, if available, are returned only when <n>=2 or <n>=3 and the MT is registered with the network. The <cause_type> and <reject_cause> parameters, if available, are returned only if <n>=3 and the MT is not registered, but it is currently searching a new operator to register to (<stat>=2) or if the registration is denied (<stat>=3).

The following is an overview of the values assumed by the <stat> parameter:

Edits the user preferred list of networks in the active application on the UICC (GSM or USIM) or preferred list of networks in the SIM card.

The set command can write an entry in the selected list or can delete it if the operator parameter is not provided.

The read command returns all used entries from the SIM list of preferred PLMNs and the Access Technologies for each PLMN in the list where provided.

If a new PLMN is added in a different format than the one previously set, the <format> parameter always switches to the last used.

Configures the integrity check on 3G/4G test networks.

Enables the protocol stack and network environment information collection.

The information text response of the read command reports only the current RAT (if any) parameters, determined by the <rat> parameter value.

Table 6 lists the supported <mode> parameter values:

Allows to manage the list of the preferred EARFCNs and to lock the module on a specific cell or frequency.

The preferred EARFCN setting is effective only when cell power levels are similar; otherwise, it is ignored. For instance, if a higher-ranked cell on a different EARFCN is available, the module will prioritize the selection of that cell. The preferred EARFCN list is automatically updated by the module based on the LTE cells it has detected so far. The update of the EARFCN list is performed in FIFO mode, and at most 8 EARFCNs are stored to NVM at module detach or switch-off.

In cell lock mode, configuring the EARFCN and P-CID pair will result in the device locking onto the designated frequency and cell, regardless of power levels. During this state, handover and reselection features remain deactivated until the lock setting is disabled. If the specified EARFCN and P-CID are not available, the module enters an Out of Coverage state (OOC).

Removes the FPLMN list from NVM or SIM or both depending on <mode> parameter. The FPLMN list in NVM has 16 entries, the FPLMN list in the SIM card has 4 entries.

Configure the module to bar a specific cell for the defined duration by adding the cell to the cell barred list.

Once this duration elapses, the system automatically removes the cell from the barred list, restoring normal access.

Returns details of the current terminal’s radio connection status (i.e. to the base-station). The set command configures the +CSCON URC. When enabled, the URC is sent from the MT at each change of the MT connection mode (<n>=1, <n>=2 or <n>=3), state (<n>=2 or <n>=3) or access information (<n>=3).

The information text response of the read command returns the URC configuration (<n>) and the signaling connection status (<mode>). The state information (<state> parameter) is returned only when module is in connected state and <n>=2 or <n>=3. The radio access technology (<access> parameter) is returned only when module is in connected state and <n>=3.

Configures the Radio Policy Manager (RPM) related parameters.

The parameters are grouped in different sets:

Activates or deactivates the Radio Policy Manager (RPM) feature and configures its related parameters.

Generally a UE aggressively retries the registration procedure until it is successful and behaves similarly if the PDP context activation procedure fails. This behavior may cause signaling overload and consequently a prolonged network outage. To avoid these scenarios and provide a more efficient access to the network, the RPM feature controls the number of network accesses per service type over a fixed amount of time. For more details on the RPM feature, see GSMA Connection Efficiency [26].

The set command overwrites the RPM parameters in the NVM. The read command displays all the current RPM parameters, counters and the leak rates.

Reads the Radio Policy Manager (RPM) version. The read command displays the current RPM version.

Configures the UEs extended discontinuous reception (eDRX) parameters. The command controls whether the UE wants to apply the eDRX or not, as well as the requested eDRX cycle and paging time window values for each specified type of radio access technology.

The set command also enables the +CEDRXP URC, issued on any change in the eDRX parameters provided by the network.

The set command with <mode>=3 will disable the use of eDRX and reset all parameters to factory-programmed values. Do not set <Requested_eDRX_cycle> and <Requested_paging_time_window> parameters in this form of command.

The read command returns the requested eDRX cycle and paging time window values. See the +CEDRXP URC and the +CEDRXRDP AT command to see if eDRX is used by the current selected cell and to retrieve the network assigned values, if any.