as specified in 3GPP TS 23.003 [2], subclause 2.8.2.2.2, the network shall use the Old GUTI type IE to determine whether the mobile identity included in the EPS mobile identity IE is a native GUTI or a mapped GUTI. When the UE initiates the attach procedure for normal service, the UE shall indicate "EPS attach" in the EPS attach type IE. otherwise, if the UE
Resource: SIM Card Forensics - Introduction. b) if the UE has an applicable UE radio capability ID for the current UE radio configuration in the selected PLMN, set the URCIDA bit to "UE radio capability ID available" in the UE radio capability ID availability IE of the ATTACH REQUEST message. distinguished: When the UE initiates a If the message has been successfully integrity checked by the NAS and the UE maintains a counter for "SIM/USIM considered invalid for GPRS services", then the UE shall set this counter to UE implementation-specific maximum value. – If the attach attempt counter is less than 5: – for the cases l, la and m, the attach procedure is started, if still necessary, when timer T3346 expires or is stopped; – for the cases b, c, d, l when the "Extended wait time" is ignored, and la when the "Extended wait time CP data" is ignore, if the attach request is neither for emergency bearer services nor for initiating a PDN connection for emergency bearer services with attach type not set to "EPS emergency attach", timer T3411 is started and the state is changed to EMM-DEREGISTERED.ATTEMPTING-TO-ATTACH. Additionally the UE enter the state EMM-DEREGISTERED.LIMITED-SERVICE or optionally EMM-DEREGISTERED.PLMN-SEARCH. The UE may provide a notification to the user or the upper layers that the SMS services are not available.
The TMSI allocated is then included in the ATTACH ACCEPT message, together with the location area identification (LAI). The UE shall start the timer T3402, shall set the EPS update status to EU1 UPDATED, shall enter state EMM-REGISTERED.ATTEMPTING-TO-UPDATE-MM, and shall enter state MM IDLE. The attach request procedure is started, if still necessary, when timer T3447 expires. The IP address allocated for the default bearer shall also be used for the dedicated bearers within the same PDN connection. When timer T3402 expires the normal tracking area updating procedure for EPS services and "SMS only" or the combined tracking area updating procedure for EPS services and "SMS only" is triggered. If, due to emergency services fallback (see 3GPP TS 23.502 [59]), there is a request for CS fallback call pending (see subclause 5.3.7), the UE shall attempt to select GERAN or UTRAN radio access technology and attempt emergency call setup.
NOTE 2: For further details concerning the handling of the MS network capability and UE network capability in the MME see also 3GPP TS 23.401 [10].
If the message has been successfully integrity checked by the NAS and the UE maintains a PLMN-specific attempt counter for that PLMN, then the UE shall set this counter to the UE implementation-specific maximum value. In a shared network, if the attach request for emergency bearer services fails due to abnormal cases b), c) or d) in subclause 5.5.1.2.6, the UE shall perform the actions as described in subclause 5.5.1.2.6, and shall: NOTE 7: This can result in the upper layers requesting establishment of a CS emergency call (if not already attempted in the CS domain), or other implementation specific mechanisms, e.g. The combined attach procedure is also used by a. If access is barred for a certain ACDC category (see 3GPP TS 36.331 [22]), a request with a higher ACDC category is received from the upper layers and the UE supports ACDC, then the attach procedure shall be started. In a UE with IMS voice over PS capability, the IMS voice over PS session indicator and the emergency bearer services indicator shall be provided to the upper layers. – a UE operating in CS/PS mode 2 of operation and a UE operating in CS/PS mode 1 of operation with "IMS voice available" shall start timer T3402, shall set the EPS update status to EU1 UPDATED and shall enter state EMM-REGISTERED.ATTEMPTING-TO-UPDATE-MM. – the UE shall start timer T3411, shall set the EPS update status to EU1 UPDATED and shall enter state EMM-REGISTERED.ATTEMPTING-TO-UPDATE-MM. If EMM-REGISTERED without PDN connection is supported by the UE and the MME, and the UE does not want to request PDN connection with the attach procedure, the UE shall send the ATTACH REQUEST message together with an ESM DUMMY MESSAGE contained in the ESM message container information element. during Paging and Service Request and its structure is shown below. Very good documentation.
If the UE supports S1-U data transfer and multiple user plane radio bearers (see 3GPP TS 36.306 [44], 3GPP TS 36.331 [22]) in NB-S1 mode, then the UE shall set the Multiple DRB support bit to "Multiple DRB supported" in the UE network capability IE of the ATTACH REQUEST message.
Initial Attach - Part 1. If the ATTACH ACCEPT message does not contain a list, then the UE shall delete the stored list.
Core Network Evolution - How CUPS changes the Call Flow? The UE shall store the current TAI in the list of "forbidden tracking areas for regional provision of service". If the UE has indicated support for the control plane data back-off timer, and the MME decides to activate the congestion control for transport of user data via the control plane, then the MME shall include the T3448 value IE in the ATTACH ACCEPT message. If the attach request for access to RLOS is received by the network and the UE requesting attach is not in limited service state, the MME shall reject the UE’s attach request.
24.3013GPPNon-Access-Stratum (NAS) protocol for Evolved Packet System (EPS)Release 16Stage 3TS.
For an Emergency Attach if the UE identifies itself with a temporary identity that is not known to the MME the MME immediately requests the IMSI from the UE. If the message has been successfully integrity checked by the NAS and the UE maintains a PLMN-specific PS-attempt counter for that PLMN, then the UE shall set this counter to the UE implementation-specific maximum value.
With a successful attach procedure in NB-S1 mode, a context is established for the UE in the MME. Cant we use the same IP address allocated for a UE to connect multiple PDNs? If the UE supports SRVCC to GERAN/UTRAN, the UE shall set the SRVCC to GERAN/UTRAN capability bit to "SRVCC from UTRAN HSPA or E-UTRAN to GERAN/UTRAN supported". If the UE has indicated "service gap control supported" in the ATTACH REQUEST message and: – the ATTACH ACCEPT message contains the T3447 value IE, then the UE shall store the new T3447 value, erase any previous stored T3447 value if exists and use the new T3447 value with the T3447 timer next time it is started; or. combined attach procedure, The UE shall send the
– a service gap time value is available in the EMM context. Second they need to identify their subscribers to decide which QoS policy (bandwidth, priority, etc.) The New MME sends the UE an Identity Request message, requesting an IMSI. The UE shall include the IMSI in the EPS mobile identity IE in the ATTACH REQUEST message if the selected PLMN is neither the registered PLMN nor in the list of equivalent PLMNs and: a) the UE is configured for "AttachWithIMSI" as specified in 3GPP TS 24.368 [15A] or 3GPP TS 31.102 [17]; or. In similar way, when a mobile moves from 4G to 5G, mobile maps and send 4G GUTI to AMF and AMF decode the MME ID for retrieve the User context. The MME drives IMSI from GUTI for the authentication and location update with HSS in the home network of LTE. Additionally, the UE shall enter state EMM-DEREGISTERED.PLMN-SEARCH and if the UE is configured to use timer T3245 (see 3GPP TS 24.368 [15A] or 3GPP TS 31.102 [17]) then the UE shall start timer T3245 and proceed as described in subclause 5.3.7a.
Additionally, the UE shall reset the attach attempt counter, enter state EMM-REGISTERED, and set the EPS update status to EU1 UPDATED.
The UE shall set the EPS update status to EU3 ROAMING NOT ALLOWED (and shall store it according to subclause 5.1.3.3) and shall delete any GUTI, last visited registered TAI, TAI list and eKSI.
), To which MME is the UE trying to attach?
Further UE behaviour is implementation specific, e.g. 2) The EPS attach result IE value indicates "EPS only": attach for EPS services has been successful but attach for non-EPS services or "SMS only" has failed. the UE holds a valid
Resource: SIM Card Forensics - Introduction. b) if the UE has an applicable UE radio capability ID for the current UE radio configuration in the selected PLMN, set the URCIDA bit to "UE radio capability ID available" in the UE radio capability ID availability IE of the ATTACH REQUEST message. distinguished: When the UE initiates a If the message has been successfully integrity checked by the NAS and the UE maintains a counter for "SIM/USIM considered invalid for GPRS services", then the UE shall set this counter to UE implementation-specific maximum value. – If the attach attempt counter is less than 5: – for the cases l, la and m, the attach procedure is started, if still necessary, when timer T3346 expires or is stopped; – for the cases b, c, d, l when the "Extended wait time" is ignored, and la when the "Extended wait time CP data" is ignore, if the attach request is neither for emergency bearer services nor for initiating a PDN connection for emergency bearer services with attach type not set to "EPS emergency attach", timer T3411 is started and the state is changed to EMM-DEREGISTERED.ATTEMPTING-TO-ATTACH. Additionally the UE enter the state EMM-DEREGISTERED.LIMITED-SERVICE or optionally EMM-DEREGISTERED.PLMN-SEARCH. The UE may provide a notification to the user or the upper layers that the SMS services are not available.
The TMSI allocated is then included in the ATTACH ACCEPT message, together with the location area identification (LAI). The UE shall start the timer T3402, shall set the EPS update status to EU1 UPDATED, shall enter state EMM-REGISTERED.ATTEMPTING-TO-UPDATE-MM, and shall enter state MM IDLE. The attach request procedure is started, if still necessary, when timer T3447 expires. The IP address allocated for the default bearer shall also be used for the dedicated bearers within the same PDN connection. When timer T3402 expires the normal tracking area updating procedure for EPS services and "SMS only" or the combined tracking area updating procedure for EPS services and "SMS only" is triggered. If, due to emergency services fallback (see 3GPP TS 23.502 [59]), there is a request for CS fallback call pending (see subclause 5.3.7), the UE shall attempt to select GERAN or UTRAN radio access technology and attempt emergency call setup.
NOTE 2: For further details concerning the handling of the MS network capability and UE network capability in the MME see also 3GPP TS 23.401 [10].
If the message has been successfully integrity checked by the NAS and the UE maintains a PLMN-specific attempt counter for that PLMN, then the UE shall set this counter to the UE implementation-specific maximum value. In a shared network, if the attach request for emergency bearer services fails due to abnormal cases b), c) or d) in subclause 5.5.1.2.6, the UE shall perform the actions as described in subclause 5.5.1.2.6, and shall: NOTE 7: This can result in the upper layers requesting establishment of a CS emergency call (if not already attempted in the CS domain), or other implementation specific mechanisms, e.g. The combined attach procedure is also used by a. If access is barred for a certain ACDC category (see 3GPP TS 36.331 [22]), a request with a higher ACDC category is received from the upper layers and the UE supports ACDC, then the attach procedure shall be started. In a UE with IMS voice over PS capability, the IMS voice over PS session indicator and the emergency bearer services indicator shall be provided to the upper layers. – a UE operating in CS/PS mode 2 of operation and a UE operating in CS/PS mode 1 of operation with "IMS voice available" shall start timer T3402, shall set the EPS update status to EU1 UPDATED and shall enter state EMM-REGISTERED.ATTEMPTING-TO-UPDATE-MM. – the UE shall start timer T3411, shall set the EPS update status to EU1 UPDATED and shall enter state EMM-REGISTERED.ATTEMPTING-TO-UPDATE-MM. If EMM-REGISTERED without PDN connection is supported by the UE and the MME, and the UE does not want to request PDN connection with the attach procedure, the UE shall send the ATTACH REQUEST message together with an ESM DUMMY MESSAGE contained in the ESM message container information element. during Paging and Service Request and its structure is shown below. Very good documentation.
If the UE supports S1-U data transfer and multiple user plane radio bearers (see 3GPP TS 36.306 [44], 3GPP TS 36.331 [22]) in NB-S1 mode, then the UE shall set the Multiple DRB support bit to "Multiple DRB supported" in the UE network capability IE of the ATTACH REQUEST message.
Initial Attach - Part 1. If the ATTACH ACCEPT message does not contain a list, then the UE shall delete the stored list.
Core Network Evolution - How CUPS changes the Call Flow? The UE shall store the current TAI in the list of "forbidden tracking areas for regional provision of service". If the UE has indicated support for the control plane data back-off timer, and the MME decides to activate the congestion control for transport of user data via the control plane, then the MME shall include the T3448 value IE in the ATTACH ACCEPT message. If the attach request for access to RLOS is received by the network and the UE requesting attach is not in limited service state, the MME shall reject the UE’s attach request.
24.3013GPPNon-Access-Stratum (NAS) protocol for Evolved Packet System (EPS)Release 16Stage 3TS.
For an Emergency Attach if the UE identifies itself with a temporary identity that is not known to the MME the MME immediately requests the IMSI from the UE. If the message has been successfully integrity checked by the NAS and the UE maintains a PLMN-specific PS-attempt counter for that PLMN, then the UE shall set this counter to the UE implementation-specific maximum value.
With a successful attach procedure in NB-S1 mode, a context is established for the UE in the MME. Cant we use the same IP address allocated for a UE to connect multiple PDNs? If the UE supports SRVCC to GERAN/UTRAN, the UE shall set the SRVCC to GERAN/UTRAN capability bit to "SRVCC from UTRAN HSPA or E-UTRAN to GERAN/UTRAN supported". If the UE has indicated "service gap control supported" in the ATTACH REQUEST message and: – the ATTACH ACCEPT message contains the T3447 value IE, then the UE shall store the new T3447 value, erase any previous stored T3447 value if exists and use the new T3447 value with the T3447 timer next time it is started; or. combined attach procedure, The UE shall send the
– a service gap time value is available in the EMM context. Second they need to identify their subscribers to decide which QoS policy (bandwidth, priority, etc.) The New MME sends the UE an Identity Request message, requesting an IMSI. The UE shall include the IMSI in the EPS mobile identity IE in the ATTACH REQUEST message if the selected PLMN is neither the registered PLMN nor in the list of equivalent PLMNs and: a) the UE is configured for "AttachWithIMSI" as specified in 3GPP TS 24.368 [15A] or 3GPP TS 31.102 [17]; or. In similar way, when a mobile moves from 4G to 5G, mobile maps and send 4G GUTI to AMF and AMF decode the MME ID for retrieve the User context. The MME drives IMSI from GUTI for the authentication and location update with HSS in the home network of LTE. Additionally, the UE shall enter state EMM-DEREGISTERED.PLMN-SEARCH and if the UE is configured to use timer T3245 (see 3GPP TS 24.368 [15A] or 3GPP TS 31.102 [17]) then the UE shall start timer T3245 and proceed as described in subclause 5.3.7a.
Additionally, the UE shall reset the attach attempt counter, enter state EMM-REGISTERED, and set the EPS update status to EU1 UPDATED.
The UE shall set the EPS update status to EU3 ROAMING NOT ALLOWED (and shall store it according to subclause 5.1.3.3) and shall delete any GUTI, last visited registered TAI, TAI list and eKSI.
), To which MME is the UE trying to attach?
Further UE behaviour is implementation specific, e.g. 2) The EPS attach result IE value indicates "EPS only": attach for EPS services has been successful but attach for non-EPS services or "SMS only" has failed. the UE holds a valid
Resource: SIM Card Forensics - Introduction. b) if the UE has an applicable UE radio capability ID for the current UE radio configuration in the selected PLMN, set the URCIDA bit to "UE radio capability ID available" in the UE radio capability ID availability IE of the ATTACH REQUEST message. distinguished: When the UE initiates a If the message has been successfully integrity checked by the NAS and the UE maintains a counter for "SIM/USIM considered invalid for GPRS services", then the UE shall set this counter to UE implementation-specific maximum value. – If the attach attempt counter is less than 5: – for the cases l, la and m, the attach procedure is started, if still necessary, when timer T3346 expires or is stopped; – for the cases b, c, d, l when the "Extended wait time" is ignored, and la when the "Extended wait time CP data" is ignore, if the attach request is neither for emergency bearer services nor for initiating a PDN connection for emergency bearer services with attach type not set to "EPS emergency attach", timer T3411 is started and the state is changed to EMM-DEREGISTERED.ATTEMPTING-TO-ATTACH. Additionally the UE enter the state EMM-DEREGISTERED.LIMITED-SERVICE or optionally EMM-DEREGISTERED.PLMN-SEARCH. The UE may provide a notification to the user or the upper layers that the SMS services are not available.
The TMSI allocated is then included in the ATTACH ACCEPT message, together with the location area identification (LAI). The UE shall start the timer T3402, shall set the EPS update status to EU1 UPDATED, shall enter state EMM-REGISTERED.ATTEMPTING-TO-UPDATE-MM, and shall enter state MM IDLE. The attach request procedure is started, if still necessary, when timer T3447 expires. The IP address allocated for the default bearer shall also be used for the dedicated bearers within the same PDN connection. When timer T3402 expires the normal tracking area updating procedure for EPS services and "SMS only" or the combined tracking area updating procedure for EPS services and "SMS only" is triggered. If, due to emergency services fallback (see 3GPP TS 23.502 [59]), there is a request for CS fallback call pending (see subclause 5.3.7), the UE shall attempt to select GERAN or UTRAN radio access technology and attempt emergency call setup.
NOTE 2: For further details concerning the handling of the MS network capability and UE network capability in the MME see also 3GPP TS 23.401 [10].
If the message has been successfully integrity checked by the NAS and the UE maintains a PLMN-specific attempt counter for that PLMN, then the UE shall set this counter to the UE implementation-specific maximum value. In a shared network, if the attach request for emergency bearer services fails due to abnormal cases b), c) or d) in subclause 5.5.1.2.6, the UE shall perform the actions as described in subclause 5.5.1.2.6, and shall: NOTE 7: This can result in the upper layers requesting establishment of a CS emergency call (if not already attempted in the CS domain), or other implementation specific mechanisms, e.g. The combined attach procedure is also used by a. If access is barred for a certain ACDC category (see 3GPP TS 36.331 [22]), a request with a higher ACDC category is received from the upper layers and the UE supports ACDC, then the attach procedure shall be started. In a UE with IMS voice over PS capability, the IMS voice over PS session indicator and the emergency bearer services indicator shall be provided to the upper layers. – a UE operating in CS/PS mode 2 of operation and a UE operating in CS/PS mode 1 of operation with "IMS voice available" shall start timer T3402, shall set the EPS update status to EU1 UPDATED and shall enter state EMM-REGISTERED.ATTEMPTING-TO-UPDATE-MM. – the UE shall start timer T3411, shall set the EPS update status to EU1 UPDATED and shall enter state EMM-REGISTERED.ATTEMPTING-TO-UPDATE-MM. If EMM-REGISTERED without PDN connection is supported by the UE and the MME, and the UE does not want to request PDN connection with the attach procedure, the UE shall send the ATTACH REQUEST message together with an ESM DUMMY MESSAGE contained in the ESM message container information element. during Paging and Service Request and its structure is shown below. Very good documentation.
If the UE supports S1-U data transfer and multiple user plane radio bearers (see 3GPP TS 36.306 [44], 3GPP TS 36.331 [22]) in NB-S1 mode, then the UE shall set the Multiple DRB support bit to "Multiple DRB supported" in the UE network capability IE of the ATTACH REQUEST message.
Initial Attach - Part 1. If the ATTACH ACCEPT message does not contain a list, then the UE shall delete the stored list.
Core Network Evolution - How CUPS changes the Call Flow? The UE shall store the current TAI in the list of "forbidden tracking areas for regional provision of service". If the UE has indicated support for the control plane data back-off timer, and the MME decides to activate the congestion control for transport of user data via the control plane, then the MME shall include the T3448 value IE in the ATTACH ACCEPT message. If the attach request for access to RLOS is received by the network and the UE requesting attach is not in limited service state, the MME shall reject the UE’s attach request.
24.3013GPPNon-Access-Stratum (NAS) protocol for Evolved Packet System (EPS)Release 16Stage 3TS.
For an Emergency Attach if the UE identifies itself with a temporary identity that is not known to the MME the MME immediately requests the IMSI from the UE. If the message has been successfully integrity checked by the NAS and the UE maintains a PLMN-specific PS-attempt counter for that PLMN, then the UE shall set this counter to the UE implementation-specific maximum value.
With a successful attach procedure in NB-S1 mode, a context is established for the UE in the MME. Cant we use the same IP address allocated for a UE to connect multiple PDNs? If the UE supports SRVCC to GERAN/UTRAN, the UE shall set the SRVCC to GERAN/UTRAN capability bit to "SRVCC from UTRAN HSPA or E-UTRAN to GERAN/UTRAN supported". If the UE has indicated "service gap control supported" in the ATTACH REQUEST message and: – the ATTACH ACCEPT message contains the T3447 value IE, then the UE shall store the new T3447 value, erase any previous stored T3447 value if exists and use the new T3447 value with the T3447 timer next time it is started; or. combined attach procedure, The UE shall send the
– a service gap time value is available in the EMM context. Second they need to identify their subscribers to decide which QoS policy (bandwidth, priority, etc.) The New MME sends the UE an Identity Request message, requesting an IMSI. The UE shall include the IMSI in the EPS mobile identity IE in the ATTACH REQUEST message if the selected PLMN is neither the registered PLMN nor in the list of equivalent PLMNs and: a) the UE is configured for "AttachWithIMSI" as specified in 3GPP TS 24.368 [15A] or 3GPP TS 31.102 [17]; or. In similar way, when a mobile moves from 4G to 5G, mobile maps and send 4G GUTI to AMF and AMF decode the MME ID for retrieve the User context. The MME drives IMSI from GUTI for the authentication and location update with HSS in the home network of LTE. Additionally, the UE shall enter state EMM-DEREGISTERED.PLMN-SEARCH and if the UE is configured to use timer T3245 (see 3GPP TS 24.368 [15A] or 3GPP TS 31.102 [17]) then the UE shall start timer T3245 and proceed as described in subclause 5.3.7a.
Additionally, the UE shall reset the attach attempt counter, enter state EMM-REGISTERED, and set the EPS update status to EU1 UPDATED.
The UE shall set the EPS update status to EU3 ROAMING NOT ALLOWED (and shall store it according to subclause 5.1.3.3) and shall delete any GUTI, last visited registered TAI, TAI list and eKSI.
), To which MME is the UE trying to attach?
Further UE behaviour is implementation specific, e.g. 2) The EPS attach result IE value indicates "EPS only": attach for EPS services has been successful but attach for non-EPS services or "SMS only" has failed. the UE holds a valid
Resource: SIM Card Forensics - Introduction. b) if the UE has an applicable UE radio capability ID for the current UE radio configuration in the selected PLMN, set the URCIDA bit to "UE radio capability ID available" in the UE radio capability ID availability IE of the ATTACH REQUEST message. distinguished: When the UE initiates a If the message has been successfully integrity checked by the NAS and the UE maintains a counter for "SIM/USIM considered invalid for GPRS services", then the UE shall set this counter to UE implementation-specific maximum value. – If the attach attempt counter is less than 5: – for the cases l, la and m, the attach procedure is started, if still necessary, when timer T3346 expires or is stopped; – for the cases b, c, d, l when the "Extended wait time" is ignored, and la when the "Extended wait time CP data" is ignore, if the attach request is neither for emergency bearer services nor for initiating a PDN connection for emergency bearer services with attach type not set to "EPS emergency attach", timer T3411 is started and the state is changed to EMM-DEREGISTERED.ATTEMPTING-TO-ATTACH. Additionally the UE enter the state EMM-DEREGISTERED.LIMITED-SERVICE or optionally EMM-DEREGISTERED.PLMN-SEARCH. The UE may provide a notification to the user or the upper layers that the SMS services are not available.
The TMSI allocated is then included in the ATTACH ACCEPT message, together with the location area identification (LAI). The UE shall start the timer T3402, shall set the EPS update status to EU1 UPDATED, shall enter state EMM-REGISTERED.ATTEMPTING-TO-UPDATE-MM, and shall enter state MM IDLE. The attach request procedure is started, if still necessary, when timer T3447 expires. The IP address allocated for the default bearer shall also be used for the dedicated bearers within the same PDN connection. When timer T3402 expires the normal tracking area updating procedure for EPS services and "SMS only" or the combined tracking area updating procedure for EPS services and "SMS only" is triggered. If, due to emergency services fallback (see 3GPP TS 23.502 [59]), there is a request for CS fallback call pending (see subclause 5.3.7), the UE shall attempt to select GERAN or UTRAN radio access technology and attempt emergency call setup.
NOTE 2: For further details concerning the handling of the MS network capability and UE network capability in the MME see also 3GPP TS 23.401 [10].
If the message has been successfully integrity checked by the NAS and the UE maintains a PLMN-specific attempt counter for that PLMN, then the UE shall set this counter to the UE implementation-specific maximum value. In a shared network, if the attach request for emergency bearer services fails due to abnormal cases b), c) or d) in subclause 5.5.1.2.6, the UE shall perform the actions as described in subclause 5.5.1.2.6, and shall: NOTE 7: This can result in the upper layers requesting establishment of a CS emergency call (if not already attempted in the CS domain), or other implementation specific mechanisms, e.g. The combined attach procedure is also used by a. If access is barred for a certain ACDC category (see 3GPP TS 36.331 [22]), a request with a higher ACDC category is received from the upper layers and the UE supports ACDC, then the attach procedure shall be started. In a UE with IMS voice over PS capability, the IMS voice over PS session indicator and the emergency bearer services indicator shall be provided to the upper layers. – a UE operating in CS/PS mode 2 of operation and a UE operating in CS/PS mode 1 of operation with "IMS voice available" shall start timer T3402, shall set the EPS update status to EU1 UPDATED and shall enter state EMM-REGISTERED.ATTEMPTING-TO-UPDATE-MM. – the UE shall start timer T3411, shall set the EPS update status to EU1 UPDATED and shall enter state EMM-REGISTERED.ATTEMPTING-TO-UPDATE-MM. If EMM-REGISTERED without PDN connection is supported by the UE and the MME, and the UE does not want to request PDN connection with the attach procedure, the UE shall send the ATTACH REQUEST message together with an ESM DUMMY MESSAGE contained in the ESM message container information element. during Paging and Service Request and its structure is shown below. Very good documentation.
If the UE supports S1-U data transfer and multiple user plane radio bearers (see 3GPP TS 36.306 [44], 3GPP TS 36.331 [22]) in NB-S1 mode, then the UE shall set the Multiple DRB support bit to "Multiple DRB supported" in the UE network capability IE of the ATTACH REQUEST message.
Initial Attach - Part 1. If the ATTACH ACCEPT message does not contain a list, then the UE shall delete the stored list.
Core Network Evolution - How CUPS changes the Call Flow? The UE shall store the current TAI in the list of "forbidden tracking areas for regional provision of service". If the UE has indicated support for the control plane data back-off timer, and the MME decides to activate the congestion control for transport of user data via the control plane, then the MME shall include the T3448 value IE in the ATTACH ACCEPT message. If the attach request for access to RLOS is received by the network and the UE requesting attach is not in limited service state, the MME shall reject the UE’s attach request.
24.3013GPPNon-Access-Stratum (NAS) protocol for Evolved Packet System (EPS)Release 16Stage 3TS.
For an Emergency Attach if the UE identifies itself with a temporary identity that is not known to the MME the MME immediately requests the IMSI from the UE. If the message has been successfully integrity checked by the NAS and the UE maintains a PLMN-specific PS-attempt counter for that PLMN, then the UE shall set this counter to the UE implementation-specific maximum value.
With a successful attach procedure in NB-S1 mode, a context is established for the UE in the MME. Cant we use the same IP address allocated for a UE to connect multiple PDNs? If the UE supports SRVCC to GERAN/UTRAN, the UE shall set the SRVCC to GERAN/UTRAN capability bit to "SRVCC from UTRAN HSPA or E-UTRAN to GERAN/UTRAN supported". If the UE has indicated "service gap control supported" in the ATTACH REQUEST message and: – the ATTACH ACCEPT message contains the T3447 value IE, then the UE shall store the new T3447 value, erase any previous stored T3447 value if exists and use the new T3447 value with the T3447 timer next time it is started; or. combined attach procedure, The UE shall send the
– a service gap time value is available in the EMM context. Second they need to identify their subscribers to decide which QoS policy (bandwidth, priority, etc.) The New MME sends the UE an Identity Request message, requesting an IMSI. The UE shall include the IMSI in the EPS mobile identity IE in the ATTACH REQUEST message if the selected PLMN is neither the registered PLMN nor in the list of equivalent PLMNs and: a) the UE is configured for "AttachWithIMSI" as specified in 3GPP TS 24.368 [15A] or 3GPP TS 31.102 [17]; or. In similar way, when a mobile moves from 4G to 5G, mobile maps and send 4G GUTI to AMF and AMF decode the MME ID for retrieve the User context. The MME drives IMSI from GUTI for the authentication and location update with HSS in the home network of LTE. Additionally, the UE shall enter state EMM-DEREGISTERED.PLMN-SEARCH and if the UE is configured to use timer T3245 (see 3GPP TS 24.368 [15A] or 3GPP TS 31.102 [17]) then the UE shall start timer T3245 and proceed as described in subclause 5.3.7a.
Additionally, the UE shall reset the attach attempt counter, enter state EMM-REGISTERED, and set the EPS update status to EU1 UPDATED.
The UE shall set the EPS update status to EU3 ROAMING NOT ALLOWED (and shall store it according to subclause 5.1.3.3) and shall delete any GUTI, last visited registered TAI, TAI list and eKSI.
), To which MME is the UE trying to attach?
Further UE behaviour is implementation specific, e.g. 2) The EPS attach result IE value indicates "EPS only": attach for EPS services has been successful but attach for non-EPS services or "SMS only" has failed. the UE holds a valid
