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Content for  TS 23.401  Word version:  17.6.0

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5.7.3  Serving GWp. 327

The Serving-GW maintains the following EPS bearer context information for UEs. Table 5.7.3-1 shows the context fields for one UE.
For emergency attached or RLOS attached UEs which are not authenticated, IMEI is stored in context.
Field Description E-UTRAN UTRAN/GERAN
IMSIIMSI (International Mobile Subscriber Identity) is the subscriber permanent identity.XX
IMSI-unauthenticated-indicatorThis is an IMSI indicator to show the IMSI is unauthenticated.XX
ME IdentityMobile Equipment Identity (e.g. IMEI/IMEISV).XX
MSISDNThe basic MSISDN of the UE. The presence is dictated by its storage in the HSS.XX
Selected CN operator idSelected core network operator identity (to support network sharing as defined in TS 23.251).XX
LTE-M IndicationInformation used by the core network to differentiate traffic from category M UEs for charging purposes, where different values of M (e.g. M1, M2) are defined in TS 36.306.X
MME TEID for S11MME Tunnel Endpoint Identifier for the S11 interfaceX
MME IP address for S11MME IP address the S11 interface.X
S-GW TEID for S11/S4 (control plane)S-GW Tunnel Endpoint Identifier for the S11 Interface and the S4 Interface (control plane).XX
S-GW IP address for S11/S4 (control plane)S-GW IP address for the S11 interface and the S4 Interface (control plane).XX
SGSN IP address for S4 (control plane)SGSN IP address for the S4 interface (Used by the S-GW).X
SGSN TEID for S4 (control plane)SGSN Tunnel Endpoint Identifier for the S4 interface.X
Trace referenceIdentifies a record or a collection of records for a particular trace.XX
Trace typeIndicates the type of traceXX
Trigger idIdentifies the entity that initiated the traceXX
OMC identityIdentifies the OMC that shall receive the trace record(s).XX
Last known Cell IdThis is the last location of the UE known by the networkX (1)X (1)
Last known Cell Id ageThis is the age of the above UE location informationX (1)X (1)
DL Data Buffer Expiration TimeThe time until the Serving-GW buffers DL data, when the MME has requested extended buffering in an DDN Ack (e.g. when a UE is in PSM).XX
Serving PLMN-Rate-ControlFor inclusion on Serving-GW CDR to allow post processing of CDRs and permit detection of abusive UEs.X
For each PDN Connection:
APN in UseThe APN currently used, as received from the MME or S4 SGSN.XX
PDN TypeIPv4, IPv6, IPv4v6, Non-IP or Ethernet. (This information is needed by the SGW in order to determine whether to perform Paging Policy Differentiation).X
EPS PDN Charging CharacteristicsThe charging characteristics of this PDN connection, e.g. normal, prepaid, flat-rate and/or hot billing.XX
P-GW Address in Use (control plane)The IP address of the P-GW currently used for sending control plane signalling.XX
P-GW TEID for S5/S8 (control plane)P-GW Tunnel Endpoint Identifier for the S5/S8 interface for the control plane. (For GTP-based S5/S8 only).XX
P-GW Address in Use (user plane)The IP address of the P-GW currently used for sending user plane traffic. (For PMIP-based S5/S8 only)XX
P-GW GRE Key for uplink traffic (user plane)PDN-GW assigned GRE Key for the S5/S8 interface for the user plane for uplink traffic. (For PMIP-based S5/S8 only)XX
S-GW IP address for S5/S8 (control plane)S-GW IP address for the S5/S8 for the control plane signalling.XX
S-GW TEID for S5/S8 (control plane)S-GW Tunnel Endpoint Identifier for the S5/S8 control plane interface. (For GTP-based S5/S8 only).XX
S-GW Address in Use (user plane)The IP address of the S-GW currently used for sending user plane traffic. (For PMIP-based S5/S8 only)XX
S-GW GRE Key for downlink traffic (user plane)Serving-GW assigned GRE Key for the S5/S8 interface for the user plane for downlink traffic. (For PMIP-based S5/S8 only)XX
Default BearerIdentifies the default bearer within the PDN connection by its EPS Bearer Id. (For PMIP based S5/S8.)XX
For each EPS Bearer within the PDN Connection:
EPS Bearer IdAn EPS bearer identity uniquely identifies an EPS bearer for one UE accessing via E-UTRANXX
TFTTraffic Flow TemplateXX
P-GW Address in Use (user plane)The IP address of the P-GW currently used for sending user plane traffic. (For GTP-based S5/S8 only).XX
P-GW TEID for S5/S8 (user plane)P-GW Tunnel Endpoint Identifier for the S5/S8 interface for the user plane. (For GTP-based S5/S8 only).XX
S-GW IP address for S5/S8 (user plane)S-GW IP address for user plane data received from PDN-GW. (For GTP-based S5/S8 only).XX
S-GW TEID for S5/S8 (user plane)S-GW Tunnel Endpoint Identifier for the S5/S8 interface for the user plane. (For GTP-based S5/S8 only).XX
S-GW IP address for S1-u, S12, S4 (user plane) and S11-uS-GW IP address for the S1-u interface (used by the eNodeB), for the S12 interface (used by the RNC) and for the S4 interface (used by the SGSN). Also S-GW IP address for the S11-u interface (used by the MME) if no separation of S1-U and S11-U is required. The S11-u interface is used for Control Plane CIoT EPS Optimisation.XX
S-GW IP address for S11-uS-GW IP address for the S11-u interface (used by the MME). if S11-u is separated from S1-u. The S11-u interface is used for Control Plane CIoT EPS Optimisation.X
S-GW TEID for S1-u, S12, S4 (user plane) and S11-uS-GW Tunnel Endpoint Identifier for the S1-u interface, for the S12 interface (used by the RNC) and for the S4 interface (used by the SGSN). Also S-GW Tunnel Endpoint Identifier for the S11-u interface (used by the MME) if no separation of S1-U and S11-U is required. The S11-u interface is used for Control Plane CIoT EPS Optimisation.XX
S-GW TEID for S11-uS-GW Tunnel Endpoint Identifier for the S11-u interface (used by the MME) if S11-u is separated from S1-u. The S11-u interface is used for Control Plane CIoT EPS Optimisation.X
MME IP address for S11-uMME IP address for the S11-u interface (Used by the S-GW). The S11-u interface is used for Control Plane CIoT EPS Optimisation.X
MME TEID for S11-uMME Tunnel Endpoint Identifier for the S11-u interface (Used by the S-GW). The S11-u interface is used for Control Plane CIoT EPS Optimisation.X
eNodeB IP address for S1-ueNodeB IP address for the S1-u interface (Used by the S-GW).X
eNodeB TEID for S1-ueNodeB Tunnel Endpoint Identifier for the S1-u interface.X
RNC IP address for S12RNC IP address for the S12 interface (Used by the S-GW).X
RNC TEID for S12RNC Tunnel Endpoint Identifier for the S12 interface.X
SGSN IP address for S4 (user plane)SGSN IP address for the S4 interface (Used by the S-GW).X
SGSN TEID for S4 (user plane)SGSN Tunnel Endpoint Identifier for the S4 interface.X
EPS Bearer QoSARP, GBR, MBR, QCI.XX
Charging IdCharging identifier, identifies charging records generated by S-GW and PDN-GW.XX
NOTE 1:
The "Last Known Cell Id Age" is stored so that when UE location information is made available from both E-UTRAN and UTRAN/GERAN, the Serving-GW can determine the "Last Known Cell Id".
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5.7.4  PDN GWp. 330

The PDN-GW maintains the following EPS bearer context information for UEs. Table 5.7.4-1 shows the context fields for one UE.
For emergency attached or RLOS attached UEs which are not authenticated, IMEI is stored in context.
Field Description E-UTRAN UTRAN/GERAN
IMSIIMSI (International Mobile Subscriber Identity) is the subscriber permanent identity.XX
IMSI-unauthenticated-indicatorThis is an IMSI indicator to show the IMSI is unauthenticated.XX
ME IdentityMobile Equipment Identity (e.g. IMEI/IMEISV).XX
MSISDNThe basic MSISDN of the UE. The presence is dictated by its storage in the HSS. X X Selected CN operator id Selected core network operator identity (to support network sharing as defined in TS 23.251).XX
RAT typeCurrent RATXX
LTE-M IndicationInformation used by the core network to differentiate traffic from Category M UEs for charging purposes, where different values of M (e.g. M1, M2) are defined in TS 36.306.X
Trace referenceIdentifies a record or a collection of records for a particular trace.XX
Trace typeIndicates the type of traceXX
Trigger idIdentifies the entity that initiated the traceXX
OMC identityIdentifies the OMC that shall receive the trace record(s).XX
For each APN in use:
APN in useThe APN currently used, as received from the S-GW.XX
APN-AMBRThe maximum aggregated uplink and downlink MBR values to be shared across all Non-GBR bearers, which are established for this APN.XX
APN Rate ControlThe APN-Rate-Control limits the maximum number of uplink/downlink packets and the maximum number of additional exception report packets per a specific time unit (e.g. minute, hour, day, week) for this APN. It includes an indication as to whether or not Exception reports may still be sent when the limit has been met.X
For each PDN Connection within the APN:
IP Address(es)IPv4 address and/or IPv6 prefix.XX
PDN typeIPv4, IPv6, IPv4v6, Non-IP or Ethernet.XX
S-GW Address in Use (control plane)The IP address of the S-GW currently used for sending control plane signalling.XX
S-GW TEID for S5/S8 (control plane)S-GW Tunnel Endpoint Identifier for the S5/S8 interface for the control plane. (For GTP-based S5/S8 only).XX
S-GW Address in Use (user plane)The IP address of the S-GW currently used for sending user plane traffic. (For PMIP-based S5/S8 only).XX
S-GW GRE Key for downlink traffic (user plane)Serving-GW assigned GRE Key for the S5/S8 interface for the user plane for downlink traffic. (For PMIP-based S5/S8 only).XX
P-GW IP address for S5/S8 (control plane)P-GW IP address for the S5/S8 for the control plane signalling.XX
P-GW TEID for S5/S8 (control plane)P-GW Tunnel Endpoint Identifier for the S5/S8 control plane interface. (For GTP-based S5/S8 only).XX
P-GW Address in Use (user plane)The IP address of the P-GW currently used for sending user plane traffic. (For PMIP-based S5/S8 only).XX
P-GW GRE Key for uplink traffic (user plane)PDN-GW assigned GRE Key for the S5/S8 interface for the user plane for uplink traffic. (For PMIP-based S5/S8 only).XX
MS Info Change Reporting support indicationThe MME and/or SGSN serving the UE support(s) procedures for reporting User Location Information and/or User CSG Information.XX
MS Info Change Reporting ActionDenotes whether the MME and/or the SGSN is/are requested to send changes in User Location Information change.XX
CSG Information Reporting ActionDenotes whether the MME and/or the SGSN is/are requested to send changes in User CSG Information change.
This field denotes separately whether the MME/SGSN are requested to send changes in User CSG Information for (a) CSG cells, (b) hybrid cells in which the subscriber is a CSG member, and (c) hybrid cells in which the subscriber is not a CSG member, or any combination of the above.
XX
Presence Reporting Area ActionDenotes whether the MME and/or the SGSN is/are requested to send changes of UE presence in Presence Reporting Area.This field denotes separately the Presence Reporting Area identifier and the list of Presence Reporting Area elements.XX
BCMThe negotiated Bearer Control Mode for GERAN/UTRAN.X
Default BearerIdentifies the default bearer within the PDN connection by its EPS Bearer Id. The default bearer is the one which is established first within the PDN connection. (For GTP based S5/S8 or for PMIP based S5/S8 if multiple PDN connections to the same APN are supported).XX
EPS PDN Charging CharacteristicsThe charging characteristics of this PDN connection e.g. normal, prepaid, flat-rate and/or hot billing.
Serving PLMN-Rate-ControlThe Serving PLMN-Rate-Control limits the maximum number of uplink/downlink messages per a specific time unit (e.g. minute, hour, day, week) for a PDN connection.X
3GPP PS Data Off StatusCurrent 3GPP PS Data Off status of the UE.
For each PDN Connection within the APN:
EPS Bearer IdAn EPS bearer identity uniquely identifies an EPS bearer for one UE accessing via E-UTRAN X X TFT Traffic Flow TemplateXX
S-GW Address in Use (user plane)The IP address of the S-GW currently used for sending user plane traffic.XX
S-GW TEID for S5/S8 (user plane)S-GW Tunnel Endpoint Identifier for the S5/S8 interface for the user plane.XX
P-GW IP address for S5/S8 (user plane)P-GW IP address for user plane data received from PDN-GW.XX
P-GW TEID for S5/S8 (user plane)P-GW Tunnel Endpoint Identifier for the GTP Based S5/S8 interface for user plane.XX
EPS Bearer QoSARP, GBR, MBR, QCI.XX
Charging IdCharging identifier, identifies charging records generated by S-GW and PDN-GWXX
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5.7.5  UEp. 333

The UE maintains the following context information. Table 5.7.5-1 shows the context fields. A GERAN or UTRAN capable UE maintains in addition the context information as described in a similar UE context table in TS 23.060.
Field Description
IMSIIMSI (International Mobile Subscriber Identity) is the subscriber's permanent identity.
EMM StateMobility management state EMM-REGISTERED, EMM-DEREGISTERED.
GUTIGlobally Unique Temporary Identity.
ME IdentityMobile Equipment Identity - (e.g. IMEI/IMEISV) Software Version Number.
Tracking Area ListCurrent Tracking area list.
last visited TAIA TAI which is contained in the TA list the UE registered to the network and which identifies the tracking area last visited by the UE.
Selected NAS AlgorithmSelected NAS security algorithm.
Selected AS AlgorithmSelected AS security algorithms.
eKSIKey Set Identifier for the main key KASME. Also indicates whether the UE is using security keys derived from UTRAN or E-UTRAN security association
KASMEMain key for E-UTRAN key hierarchy based on CK, IK and Serving network identity.
NAS Keys and COUNTKNASint, KNASenc, and NAS COUNT parameter.
Temporary Identity used in Next update (TIN)This parameter is used internally by the UE to memorise which temporary ID it has to indicate in the Attach Request and RAU/TAU Request as specified in clause 4.3.5.6.
UE Specific DRX ParametersPreferred E-UTRAN DRX cycle length
Active Time value for PSMUE specific Active Time value allocated by MME for power saving mode handling.
Extended idle mode DRX parametersExtended idle mode DRX parameters received from the MME.
Allowed CSG listThe Allowed CSG list, which is under both user and operator control, indicates the list of CSG IDs and the associated PLMN where the UE is a member.
Operator CSG listThe Operator CSG list, which is under exclusive Operator control, indicates the list of CSG IDs and the associated PLMN where the UE is a member.
Service Gap TimeUsed to set the Service Gap timer for Service Gap Control (see clause 4.3.17.9).
For each active PDN connection:
APN in UseThe APN currently used. This APN shall be composed of the APN Network Identifier and the default APN Operator Identifier, as specified in TS 23.003, clause 9.1.2.
APN-AMBRThe maximum aggregated uplink and downlink MBR to be shared across all Non-GBR bearers, which are established for this APN.
Assigned PDN TypeThe PDN Type assigned by the network (IPv4, IPv6, IPv4v6, Non-IP or Ethernet).
IP Address(es)IPv4 address and/or IPv6 prefix
Header Compression ConfigurationROHC configuration and context(s) for IP header compression for Control Plane CIoT EPS Optimisation.
Default BearerIdentifies the default bearer within the PDN connection by its EPS Bearer Id. The default bearer is the one which is established first within the PDN connection.
WLAN offloadabilityIndicates whether the traffic associated with this PDN Connection is allowed to be offloaded to WLAN using the WLAN/3GPP Radio Interworking feature or if it shall be kept on 3GPP access (see clause 4.3.23). The indication may contain separate values per RAT (E-UTRA and UTRA).
APN Rate ControlThe APN-Rate-Control limits the maximum number of uplink packets and the maximum number of additional exception report packets per a specific time unit (e.g. minute, hour, day, week) for this APN. It includes an indication as to whether or not Exception reports may still be sent when the limit has been met.
Serving PLMN-Rate-ControlThe Serving PLMN-Rate-Control limits the maximum number of NAS Data PDUs per deci hour sent uplink using the Control Plane CIoT EPS Optimisation for a PDN connection.
For each EPS Bearer within the PDN connection
EPS Bearer IDAn EPS bearer identity uniquely identifies an EPS bearer for one UE accessing via E-UTRAN.
TITransaction Identifier
EPS bearer QoSGBR and MBR for GBR bearer.
TFTTraffic Flow Template.
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5.7.6  Handling of Wild Card APNp. 334

When the wild card APN is present in the subscription context, the UE is authorized to connect to APNs which are not present in the subscription context.
When a request is received for registering a PDN-GW ID and there is no PDN subscription context with this APN, the nodes (HSS/MME/ S4 SGSN) shall store the PDN-GW ID - APN relation for the UE.
When a request is received for deregistering of PDN-GW ID and there is no PDN subscription context with this APN, the nodes (HSS/MME/S4 SGSN) shall delete the PDN-GW ID - APN relation from the list of APN - PDN-GW ID relations.
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5.7.7  CSS |R11|p. 335

Please refer to TS 23.008 for the content of the information storage for the CSS.

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