29.06.2021 Orange Romania
My Romanian Operator, Orange billing me for data in Roaming (Dubai, 13EURO/MB) while the phone had Mobile Data : OFF.
Broadcast packets, any lost packets, garbage can be sent by the Operator's NW routers towards the phone.
A lot of strange 9.8 kBytes data transfers. Only Samsung ShannonDM could shed some light here.
Workaround while roaming: put the phone in 2G/3G only + Mobile Data OFF, in this way it doesn't have any IP address so no UL/DL data possible.
https://nickvsnetworking.com/ps-data-off/
LTE 3GPP feature (Release 14 /2017), most likely not implemented by any UE vendor or Operator
https://www.mediatek.com/blog/packet-switch-data-off-whitepaper
" For example, often when traveling users want to disable roaming to avoid adverse data fees. However, applications or services may still be requesting to receive data even though roaming is set to “off” – as a result the user is charged.
In addition, prior to 3GPP Release 14, it does not allow network operators to differentiate between data traffic and other services that may use IP-driven connections, but aren’t billed as such. These include IMS MMTEL voice and video services, USSD, XCAP, BIP, or SMS over IP. Naturally, if these are services exempt from data fees users will still want these services running even when the data connection is turned off.
As a result of these limitations, 3GPP issued new procedures – 3GPP PS Data Off - that give the user greater control; both device and operator are aware of the data connectivity settings chosen by the user. The exception is 3GPP PS Data Off Exempt Services, which are allowed/essential operator services regardless of setting.
By introducing this feature in 3GPP, it is expected that the network operators will unlock new areas of service differentiators and enhance the end-user experience at home or when traveling."
UE Reports then it sets the PS Data = OFF and the network doesn't allow DL data
UE sends : Request Bearer Resource Modification with PS Data Off “active”
UE should block the traffic in UL, NW should block the traffic in DL
3GPP TS 24.301 V16.4.0 (2020-03)
6.3.10 Handling of 3GPP PS data off
A UE, which supports 3GPP PS data off (see 3GPP TS 23.401 [10]), can be configured with up to two lists of 3GPP PS data off exempt services as specified in 3GPP TS 24.368 [15A] or in the EF3GPPPSDATAOFF USIM file as specified in 3GPP TS 31.102 [17]:
- a list of 3GPP PS data off exempt services to be used in the HPLMN or EHPLMN; and
- a list of 3GPP PS data off exempt services to be used in the VPLMN.
If only the list of 3GPP PS data off exempt services to be used in the HPLMN or EHPLMN is configured at the UE, this list shall be also used in the VPLMN.
If the UE supports 3GPP PS data off, the UE shall provide the 3GPP PS data off UE status in the protocol configuration options IE during attach, UE-requested PDN connectivity, and UE-requested bearer resource modification procedure (see subclause 5.5.1, 6.5.1, and 6.5.4).
NOTE 1: The sending of the 3GPP PS data off UE status to the network happens also when the user activates or deactivates 3GPP PS data off while connected via WLAN access only, and then handover to 3GPP access occur.
The network informs the UE about the support of 3GPP PS data off during the activation of the the default bearer of a PDN connection (see subclause 6.4.1). If 3GPP PS data off support is not indicated in the protocol configuration options IE in the ACTIVATE DEFAULT EPS BEARER CONTEXT REQUEST message, the UE shall not indicate any change of 3GPP PS data off UE status for the PDN connection established by the default EPS bearer context activation procedure;
otherwise the UE shall indicate change of the 3GPP PS data off UE status for the PDN connection by using the UE-requested bearer resource modification procedure as specified in subclause 6.5.4. If the network does not provide indication of support of 3GPP PS data off during default EPS bearer context activation procedure of the PDN connection, the UE behaviour for non-exempt service requests from the network is implementation dependent
3GPP TS 23.401 V16.10.0 (2021-03)
4.3.29 3GPP PS Data Off
4.3.29.1 General
This feature, when activated by the user, prevents transport via 3GPP access of all IP packets, Ethernet data and non-IP data except for those related to 3GPP PS Data Off Exempt Services. The 3GPP PS Data Off Exempt Services are a set of operator services, defined in TS 23.221 [27], that are the only allowed services when the 3GPP PS Data Off feature has been activated by the user.
UEs may be configured with up to two lists of 3GPP PS Data Off Exempt Services and the list(s) are provided to the UEs by HPLMN via Device Management or UICC provisioning. When the UE is configured with two lists, one list is valid for the UEs camping in the home PLMN and the other list is valid for any VPLMN the UE is roaming in. When the UE is configured with a single list, without an indication to which PLMNs the list is applicable, then this list is valid for the home PLMN and any PLMN the UE is roaming in.
NOTE 1: The operator needs to ensure coordinated lists of 3GPP Data Off Exempt Services provisioned in the UE and configured in the network.
The UE discovers whether a PDN GW supports 3GPP PS Data Off feature at initial attach and during the establishment of a PDN connection via the presence of the 3GPP PS Data Off Support Indication in the Create Session response message.
NOTE 2: When the UE detects that the PDN GW does not support 3GPP PS Data Off feature, how the UE reacts to non exempt services MT requests from the network is implementation dependent.
The UE shall report its 3GPP PS Data Off status in PCO (Protocol Configuration Option) to PDN GW during Initial Attach procedure as described in clause 5.3.2.1 and UE requested PDN connectivity procedure as described in clause 5.10.2.
NOTE 3: This also covers scenarios when the user activates/deactivates 3GPP PS Data Off while connected via WLAN access only, and then a handover to 3GPP access occurs.
If 3GPP PS Data Off is activated, the UE prevents the sending of uplink IP packets, Ethernet data and non-IP data except for those related to 3GPP PS Data Off Exempt Services, based on the pre-configured list of Data Off Exempt Services.
For those PDN GWs that indicated support for the 3GPP PS Data Off feature during PDN connection setup and at Initial Attach, the UE shall report immediately a change of its 3GPP PS Data Off status in PCO by using Bearer Resource Modification procedure as described in clause 5.4.5, this also applies to the scenario of inter-RAT mobility procedure to E-UTRAN and also to scenarios where the 3GPP PS Data Off status is changed when the session management back-off timer is running as specified in clause 4.3.7.4.2. If the UE has not received any 3GPP PS Data Off Support Indication during the establishment of the PDN connection, it shall not report any change of its 3GPP PS Data Off Status for this PDN connection.
The additional behaviour of the PDN GW for 3GPP PS Data Off is controlled by local configuration or policy from the PCRF as defined in TS 23.203 [6].
NOTE 4: For the PDN connection used for IMS services, the 3GPP Data Off Exempt Services are enforced in the IMS domain as specified TS 23.228 [52]. Policies configured in the PDN GW/PCRF need to ensure those services are always allowed when the 3GPP Data Off status of the UE is set to "activated".
3GPP TS 23.203 V16.2.0 (2019-12)
6.1.21 3GPP PS Data Off
This feature, when activated by the user, prevents downlink traffic and may prevent uplink traffic via 3GPP access except for 3GPP PS Data Off Exempt Services.
NOTE 1: Preventing uplink packets that don't belong to 3GPP Data Off Exempt Services in PDN GW implies that the exempt uplink packets in the UE have traversed the Serving GW but get dropped in the PDN GW. If this happens, it's not possible to verify accounting information collected at the Serving GW for inter-operator charging. However, the subscriber may not be charged for those packets.
The 3GPP PS Data Off Exempt Services are a set of operator services, defined in TS 22.011 [49], that are the only allowed services in downlink direction when the 3GPP PS Data Off feature has been activated by the user.
When PCRF is deployed, it shall be configured with the list of 3GPP PS Data Off Exempt Services and the event trigger of 3GPP PS Data Off status change is used to inform the PCRF about every change of the 3GPP PS Data Off status.
NOTE 2: The PCRF can be configured with a list of 3GPP PS Data Off Exempt Services per APN. The list of 3GPP PS Data Off Exempt Services for an APN can also be empty, or can allow for any service within that APN, according to operator policy.
NOTE 3: The PCRF can be configured with up to two lists of 3GPP PS Data Off Exempt Services for UEs in HPLMN and for UEs camping in any VPLMNs using mechanism as specified in clause 6.2.1.1.
NOTE 4: For the PDN connection used for IMS services, the 3GPP Data Off Exempt Services are enforced in the IMS domain as specified TS 23.228 [39]. Policies configured in the PCRF need to ensure that IMS services are allowed when the 3GPP Data Off status of the UE is set to "activated", e.g. by treating any service within a well-known IMS APN as 3GPP PS Data Off Exempt Services.
When the PCRF is informed about the activation of 3GPP PS Data Off, it shall update the PCC rules in such a way that only packets for services belonging to the list of 3GPP PS Data Off Exempt Services are forwarded while all other packets are discarded.
NOTE 5: In order for the PCEF to prevent the services that do not belong to the list of 3GPP PS Data Off Exempted Services, if the services are controlled by dynamic PCC rules, the PCRF could modify the PCC rules by setting the gate status to "closed" for the downlink and optionally uplink directions in all active dynamic PCC rules or remove those dynamic PCC rules. If the services are controlled by predefined PCC rules, the PCRF can deactivate those predefined PCC rules. PCC rule with wild-carded service data flow filters can be among the PCC rules that are modified, removed or deactivated in that manner. In this case, it can be necessary that the PCRF at the same time installs or activates PCC rules for data-off exempt services.
NOTE 6: For example, four PCC rules (A, B, C, D) are active for a PDN connection with PCC rule A representing a 3GPP PS Data Off Exempt Service. When 3GPP PS Data Off is activated, the PCRF could either modify PCC rules B, C and D if they are dynamic PCC rules by closing the gate in downlink and optionally in uplink direction or remove/deactivate PCC rules B, C and D if they are predefined PCC rules. PCC rule A does not need to be changed as it represents 3GPP PS Data Off Exempt Service. Assuming that PCC rule B contained wild-carded service data flow filters which has enabled some 3GPP PS Data Off Exempt Service is removed or deactivated, an additional PCC rule E can be installed or activated as well to enable the downlink traffic for that 3GPP PS Data Off Exempt Service.
NOTE 7: The network configuration can ensure that at least one PCC Rule is bound to the default bearer when Data Off is activated in order to avoid deletion of an existing PDN connection or in order not to fail a PDN connection establishment.
When the PCRF receives service information from the AF, in addition to what is specified in clause 6.2.1.0, PCRF shall check if the requested service information belongs to the 3GPP PS Data Off Exempt Services. If the requested service belongs to 3GPP PS Data Off Exempt Services, PCRF shall continue as specified in clause 6.2.1.0. If the requested service doesn't belong to the 3GPP PS Data Off Exempt Services, PCRF shall reject the service request.
When the PCRF is informed about the deactivation of 3GPP PS Data Off, it shall perform policy control decision as specified in clause 6.2.1.0 and perform PCC rule operations as specified in clause 6.3.2 2 to make sure that the services are allowed according to user's subscription and operator policy (irrespective of whether they belong to the list of 3GPP PS Data Off Exempt Services).
When PCRF is not deployed, predefined PCC rules, as example, can be configured in the PCEF to ensure the following:
- when the PCEF is informed about activation of 3GPP PS Data Off, only packets for services belonging to the list of 3GPP PS Data Off Exempt Services are forwarded while all other packets are discarded. The list of 3GPP PS Data Off Exempt Services for UEs camping in HPLMN and the list of 3GPP PS Data Off Exempt Services for UEs camping in VPLMN can be different, and
- When PCEF is informed about deactivation of 3GPP PS Data Off, downlink packets are forwarded according to the operator policy for the subscriber.
NOTE 8: For example, the PCEF can be configured with three sets of predefined PCC rules: one set for UEs with 3GPP PS Data Off status "inactive", the second set for UE camping in the HPLMN with 3GPP PS Data Off status "active", and the third set for UEs camping in the VPLMN with 3GPP PS Data Off status "active". The set of predefined PCC rules for UE 3GPP PS Data Off status "active" can be equivalent to the set of predefined PCC rules for UE 3GPP PS Data Off status "inactive" with the following two differences: All services belonging to the list of 3GPP PS Data Off Exempt Services can be represented by PCC rule(s) which allows the traffic to pass while in all other PCC rules (not belonging to the list of 3GPP PS Data Off Exempt Services) the gate status can be "closed" for the downlink direction. When the PCEF is informed about the change of UE 3GPP PS Data Off status, it can replace the currently active set of predefined PCC rules with the other set of predefined PCC rules.
When the UE 3GPP PS Data Off status is "active" and a handover from one access-system to another occurs, the PCRF performs the above operations so that the downlink traffic for services not belonging to the list of 3GPP PS Data Off Exempt Services is only prevented via the 3GPP access.
When NBIFOM applies for the IP-CAN session, the PCRF shall not modify PCC rules associated to the IP-CAN type "Non 3GPP EPS".
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