Cause

M

Cause

0

Recovery

C

This IE shall be included on the S5/S8, S4/S11 and S2a/S2b interfaces if contacting the peer for the first time

Recovery

0

Protocol Configuration Options (PCO)

C

The PGW shall include Protocol Configuration Options (PCO) IE on the S5/S8 interface, if available and if the UE or the network does not support ePCO.

If SGW receives this IE, SGW shall forward it to SGSN/MME on the S4/S11 interface.

PCO

0

CO

For trusted WLAN access, if the multi-connection mode is used, the PGW may include this IE over the S2a interface to send PCO to the UE.

Indication Flags

CO

This IE shall be included if any one of the applicable flags is set to 1.

Applicable flags are:

• Associate OCI with PGW node’s identity: The PGW shall set this flag to 1 on the S5/S8 interface or S2a/S2b interface if it has included the "PGW’s Overload Control Information" and if this information is to be associated with the node identity (i.e. FQDN or the IP address received from the HSS or DNS during the PGW selection) of the serving PGW. The SGW shall set this flag on the S11/S4 interface if it supports the overload control feature and if the flag is set on the S5/S8 interface.
• Associate OCI with SGW node’s identity: The SGW shall set this flag to 1 on the S11/S4 interface if it has included the "SGW’s Overload Control Information" and if this information is to be associated with the node identity (i.e. FQDN or the IP address received from the DNS during the SGW selection) of the serving SGW.

Indication

0

PGW’s node level Load Control Information

O

The PGW may include this IE on the S5/S8 or S2a/S2b interface, providing its node level load information, if the load control feature is supported by the PGW and is activated for the PLMN to which the access network node, i.e. MME/S4-SGSN for 3GPP access network, ePDG/TWAN for non-3GPP access network, belongs (see clause 12.2.6).

Load Control Information

0

CO

If the SGW receives this IE and if it supports the load control feature, it shall forward it to the MME/S4-SGSN on the S11/S4 interface.

PGW’s APN level Load Control Information

O

The PGW may include this IE on the S5/S8 or S2a/S2b interface, providing APN level load information, if the APN level load control feature is supported by the PGW and is activated for the PLMN to which the access network node, i.e. MME/S4-SGSN for 3GPP access network, ePDG/TWAN for non-3GPP access based network, belongs (see clause 12.2.6).

When present, the PGW shall provide one or more instances of this IE, up to maximum of 10, with the same type and instance value, each representing the load information for a list of APN(s).

See NOTE 1, NOTE 3.

Load Control Information

1

CO

If the SGW receives this IE and if it supports APN level load control feature, it shall forward it to the MME/S4-SGSN on the S11/S4 interface.

SGW’s node level Load Control Information

O

The SGW may include this IE, over the S11/S4 interface if the load control feature is supported by the SGW and is activated in the network (see clause 12.2.6).

When present, the SGW shall provide only one instance of this IE, representing its node level load information.

Load Control Information

2

PGW’s Overload Control Information

O

During an overload condition, the PGW may include this IE on the S5/S8 or S2a/S2b interface, if the overload control feature is supported by the PGW and is activated for the PLMN to which the access network node, i.e. MME/S4-SGSN for 3GPP access based network, ePDG/TWAN for non-3GPP access based network, belongs (see clause 12.3.11).

When present, the PGW shall provide

• node level overload control, in one instance of this IE; and/or
• APN level overload control, in one or more instances of this IE, up to maximum of 10, with the same type and instance value, each representing the overload information for a list of APN(s).

See NOTE 2, NOTE 4.

Overload Control Information

0

CO

If the SGW receives this IE and if it supports the overload control feature, it shall forward it to the MME/S4-SGSN on the S11/S4 interface.

SGW’s Overload Control Information

O

During an overload condition, the SGW may include this IE over the S11/S4 interface if the overload control feature is supported by the SGW and is activated in the network (see clause 12.3.11).

When present, the SGW shall provide only one instance of this IE, representing its overload information.

Overload Control Information

1

Extended Protocol Configuration Options (ePCO)

CO

The PGW shall include Extended Protocol Configuration Options (ePCO) IE on the S5/S8 interface, if available and if the UE and the network support ePCO.

If the SGW receives this IE, the SGW shall forward it to the MME on the S11 interface.

ePCO

0

APN RATE Control Status

CO

If APN RATE Control Status is available in PGW, APN RATE Control Status shall be transfered on the S5/S8 interface.

The SGW shall include the APN RATE Control Status IE on the S11/S4 interface, if received from the PGW.

APN RATE Control Status

0

Private Extension

O

This IE may be sent on the S5/S8, S4/S11 and S2a/S2b interfaces.

Private Extension

VS

NOTE 1: The receiver, not supporting the APN level load control feature, shall ignore all the occurrence(s) of this IE, i.e. "Load Control Information" IE with instance number "1". The receiver, supporting the APN level load control feature and supporting the APN level load information for the maximum of 10 APNs, shall handle the APN level load information for the first 10 APNs and ignore any more APN level load information.

NOTE 2: The receiver, supporting the APN level overload information for the maximum of 10 APNs, shall handle the APN level overload information for the first 10 APNs and ignore any more APN level overload information.

NOTE 3: The APN level load information, provided within and across different instances of the "PGW’s APN level Load Control Information" IE(s) shall be limited to 10 different APNs.

NOTE 4: The APN level overload information, provided within and across different instances of the "PGW’s Overload Control Information" IE(s) shall be limited to 10 different APNs.

Octets 2 and 3

Length = n

Octet 4

Spare and Instance fields

Information elements

P

Condition / Comment

IE Type

Ins.

Load Control Sequence Number

M

See clause 12.2.5.1.2.1 for the description and use of this parameter.

Sequence Number

0

Load Metric

M

See clause 12.2.5.1.2.2 for the description and use of this parameter.

Metric

0

List of APN and Relative Capacity

CO

The IE shall (only) be present in the "PGW’s APN level Load Control Information" IE.

For indicating the APN level load, the PGW shall include one or more instances of this IE, up to maximum of 10, with the same type and instance value, representing a list of APN(s) & its respective "Relative Capacity" (sharing the same "Load Metric").

See clause 12.2.5.1.2.3 for the description and use of this parameter.

See NOTE 1.

APN and Relative Capacity

0

NOTE 1: If more than 10 occurrences of "APN and Relative Capacity" IE are received within one instance of the Load Control Information IE, the receiver shall treat it as a protocol error and ignore the entire Load Control Information IE instance.

Octets 2 and 3

Length = n

Octet 4

Spare and Instance fields

Information elements

P

Condition / Comment

IE Type

Ins.

Overload Control Sequence Number

M

See clause 12.3.5.1.2.1 for the description and use of this parameter.

Sequence Number

0

Overload Reduction Metric

M

See clauses 12.3.5.1.2.3 and 12.3.5.1.2.4 for the description and use of this parameter.

Metric

0

Period of Validity

M

See clause 12.3.5.1.2.2 for the description and use of this parameter.

This IE should be set to "0" if the "Overload Reduction Metric" is null. This IE shall be ignored by the receiver if the "Overload Reduction Metric" is null.

EPC Timer

0

List of Access Point Name (APN)

CO

The IE may (only) be present in the "PGW’s Overload Control Information" IE.

For indicating the APN level overload, the PGW shall include one or more instances of this IE, up to maximum of 10, with the same type and instance value, representing a list of APN(s) (sharing the same "Overload Reduction Metric" and "Period of Validity").

See NOTE 1.

APN

0

NOTE 1: If more than 10 occurrences of APNs are received within one instance of the Overload Control Information IE, the receiver shall treat it as a protocol error and ignore the entire Overload Control Information IE instance.

Cause

M

Cause

0

Linked EPS Bearer ID (LBI)

C

If the response corresponds to the bearer deactivation procedure in case all the bearers associated with the default bearer of a PDN connection shall be released, this IE shall be included on the S4/S11, S5/S8 and S2a/S2b interfaces to indicate the default bearer associated with the PDN being disconnected.

EBI

0

CO

During a TAU/RAU/HO, if an MME/SGSN has received a Delete Bearer Request message with Cause value "ISR deactivation" and multiple LBIs, the MME/SGSN shall include all these LBIs in the response message on S4/S11 interface. All LBI IEs shall have the same type and instance value to represent a list of IEs.

Bearer Contexts

C

It shall be used on the S4/S11, S5/S8 and S2a/S2b interfaces for bearers different from default one. In this case at least one bearer shall be included.

Several IEs with this type and instance values shall be included as necessary to represent a list of Bearers.

Used for dedicated bearers. When used, at least one dedicated bearer shall be present. All the bearer contexts included in the EPS Bearer IDs IE of the corresponding Delete Bearer Request shall be included.

Bearer Context

0

Recovery

C

This IE shall be included on the S4/S11, S5/S8 and S2a/S2b interfaces if contacting the peer for the first time

Recovery

0

MME-FQ-CSID

C

This IE shall be included by MME the on S11 interface and shall be forwarded by the SGW on S5/S8 interface according to the requirements in 3GPP TS 23.007 [17].

FQ-CSID

0

SGW-FQ-CSID

C

This IE shall be included by the SGW on the S5/S8 interface according to the requirements in 3GPP TS 23.007 [17].

FQ-CSID

1

ePDG-FQ-CSID

C

This IE shall be included by the ePDG on the S2b interface according to the requirements in 3GPP TS 23.007 [17].

FQ-CSID

2

TWAN-FQ-CSID

C

This IE shall be included by the TWAN on the S2a interface according to the requirements in 3GPP TS 23.007 [17].

FQ-CSID

3

Protocol Configuration Options (PCO)

CO

An MME/SGSN shall include the PCO IE if such information was received from the UE.

If the SGW receives this IE, the SGW shall forward it to PGW on the S5/S8 interface.

PCO

0

CO

For the multi-connection mode, if the default bearer of the PDN connection is being deleted and if the TWAN receives the PCO from the UE, the TWAN shall forward the PCO IE to the PGW.

UE Time Zone

CO

This IE shall be included, if available, by the MME on the S11 interface or by the SGSN on the S4 interface.

UE Time Zone

0

CO

The SGW shall forward this IE on the S5/S8 interface if the SGW receives it from the MME/SGSN.

CO

This IE shall be included by the TWAN on the S2a interface.

User Location Information (ULI)

CO

This IE shall be included by the MME on the S11 interface or by the SGSN on the S4 interface. The CGI/SAI shall be included by SGSN and the ECGI shall be included by MME.

See NOTE 2.

ULI

0

CO

The SGW shall forward this IE on the S5/S8 interface if it receives it from the MME/SGSN. See NOTE 1.

ULI Timestamp

CO

This IE shall be included on the S4/S11 interface if the ULI IE is present. It indicates the time when the User Location Information was acquired.

The SGW shall include this IE on S5/S8 if the SGW receives it from the MME/SGSN. See NOTE 1.

ULI Timestamp

0

TWAN Identifier

CO

This IE shall be included by the TWAN on the S2a interface as specified in 3GPP TS 23.402 [45].

TWAN Identifier

0

TWAN Identifier Timestamp

CO

This IE shall be included by the TWAN on the S2a interface if the TWAN Identifier IE is present. It shall indicate the time when the TWAN acquired the TWAN Identifier information.

TWAN Identifier Timestamp

0

MME/S4-SGSN’s Overload Control Information

O

During an overload condition, the MME/S4-SGSN may include this IE on the S11/S4 interface if the overload control feature is supported by the MME/S4-SGSN and is activated for the PLMN to which the PGW belongs (see clause 12.3.11).

When present, the MME/S4-SGSN shall provide only one instance of this IE, representing its overload information.

Overload Control Information

0

CO

If the SGW receives this IE and if it supports the overload control feature, it shall forward it to the PGW on the S5/S8 interface.

SGW’s Overload Control Information

O

During an overload condition, the SGW may include this IE over the S5/S8 interface if the overload control feature is supported by the SGW and is activated for the PLMN to which the PGW belongs (see clause 12.3.11).

When present, the SGW shall provide only one instance of this IE, representing its overload information.

Overload Control Information

1

MME/S4-SGSN Identifier

CO

If the overload control feature is supported by the MME/S4-SGSN and is activated for the PLMN to which the PGW belongs (see clause 12.3.11), the MME/S4-SGSN shall include this IE on the S11/S4 interface when there is at least one bearer remaining for the given PDN connection after the bearer deletion, and the PGW has not been updated with the identity of the currently serving MME/S4-SGSN, i.e. if no other message carrying MME/S4-SGSN identity has been sent to the PGW during/after an inter-MME/S4-SGSN intra-SGW mobility procedure.

IP Address

0

TWAN/ePDG’s Overload Control Information

O

During an overload condition, the TWAN/ePDG may include this IE over the S2a/S2b interface if the overload control feature is supported by the TWAN/ePDG and is activated for the PLMN to which the PGW belongs (see clause 12.3.11).

When present, the TWAN/ePDG shall provide only one instance of this IE, representing its overload information.

Overload Control Information

2

WLAN Location Information

CO

The ePDG shall include this IE on the S2b interface if the WLAN Location Information is available.

TWAN Identifier

1

WLAN Location Timestamp

CO

The ePDG shall include this IE on the S2b interface, if the WLAN Location Timestamp is available.

TWAN Identifier Timestamp

1

UE Local IP Address

CO

The ePDG shall include this IE on the S2b interface.

IP Address

0

UE UDP Port

CO

The ePDG shall include this IE on the S2b interface if NAT is detected and UDP encapsulation is used.

Port Number

0

NBIFOM Container

CO

This IE shall be included on the S11/S4 or S2a/S2b interfaces if the MME/S4-SGSN or the TWAN/ePDG receives a NBIFOM Container from the UE as specified in 3GPP TS 24.161 73]. The Container Type shall be set to 4.

F-Container

0

CO

If the SGW receives a NBIFOM Container IE from the MME/S4-SGSN, the SGW shall forward it to the PGW on the S5/S8 interface.

UE TCP Port

CO

The ePDG shall include this IE on the S2b interface if NAT is detected and TCP encapsulation is used.

Port Number

1

Secondary RAT Usage Data Report

CO

If the PLMN has configured secondary RAT usage reporting, the MME shall include this IE on the S11 interface if it has received Secondary RAT usage data from eNodeB in a PDN GW initiated bearer deactivation procedure.

Several IEs with the same type and instance value may be included, to represent multiple usage data reports.

Secondary RAT Usage Data Report

0

O

The SGW shall forward this IE on the S5/S8 interface if it receives the Secondary RAT Usage Data Report with the IRPGW flag set to "1" from MME.

Several IEs with the same type and instance value may be included, to represent multiple usage data reports.

PSCell ID

CO

The MME shall include this IE on the S11 interface, if it has received this information from the eNodeB.

PSCell ID

0

Private Extension

O

This IE may be sent on the S5/S8, S4/S11 and S2a/S2b interfaces.

Private Extension

VS

NOTE 1: If ISR is active, after receiving both the Delete Bearer Response messages from the MME and the SGSN, the SGW shall include the most recent time and the related User Location Information in the Delete Bearer Response message on S5/S8 interface.

NOTE 2: In shared networks, when the message is sent from the VPLMN to the HPLMN, the PLMN ID that is communicated in this IE shall be that of the selected Core Network Operator for supporting UEs, or that of the allocated Core Network Operator for non-supporting UEs. As an exception, based on inter-operator roaming/sharing agreement, if the information on whether the UE is a supporting or non-supporting UE is available, the PLMN ID that is communicated to the HPLMN for non-supporting UEs shall be the Common PLMN ID.
In shared networks, when the MME/S4-SGSN and PGW pertain to the same PLMN, the Primary PLMN ID shall be communicated in the ECGI to the PGW, and the Common PLMN ID shall be communicated in SAI/CGI to the PGW, for both supporting and non-supporting UEs. The Core Network Operator PLMN ID (selected by the UE for supporting UEs or allocated by the network for non-supporting UEs) shall be communicated in the TAI, RAI, UCI and the Serving Network.
See clause 4.4 of 3GPP TS 23.251 [55].

Octets 2 and 3

Length = n

Octet 4

Spare and Instance fields

Information elements

P

Condition / Comment

IE Type

Ins.

EPS Bearer ID

M

EBI

0

Cause

M

This IE shall indicate if the bearer handling was successful, and if not, gives information on the reason.

Cause

0

Protocol Configuration Options (PCO)

CO

An MME/SGSN shall include the PCO IE if such information was received from the UE.

If the SGW receives this IE, the SGW shall forward it to PGW on the S5/S8 interface.

This bearer level IE takes precedence over the PCO IE in the message body if they both exist.

PCO

0

RAN/NAS Cause

CO

The MME shall include this IE on the S11 interface to indicate the RAN release cause and/or NAS release cause to release the bearer, if this information is available and is permitted to be sent to the PGW operator according to the MME operator’s policy.

If both a RAN release cause and a NAS release cause are generated, then several IEs with the same type and instance value shall be included to represent a list of causes.

The SGW shall include this IE on the S5/S8 interface if it receives it from the MME.

See NOTE 1.

RAN/NAS Cause

0

Extended Protocol Configuration Options (ePCO)

CO

An MME shall include the ePCO IE if such information is received from the UE.

If the SGW receives this IE, the SGW shall forward it to the PGW on the S5/S8 interface.

ePCO

0

NOTE 1: The MME may defer the deactivation of GBR bearers for a short period (in the order of seconds) upon receipt of an S1AP UE Context Release Request due to radio reasons, so as to allow the UE to re-establish the corresponding radio and S1 bearers and thus avoid the deactivation of the GBR bearers. If the MME receives then a Delete Bearer Request while it is still deferring the sending of a Delete Bearer Command, the MME shall include in the Delete Bearer Response the RAN/NAS Cause IE it would have included in the Delete Bearer Command. See clauses 5.3.5 and 5.4.4.1 of 3GPP TS 23.401 [3].

Octets 2 and 3

Length = n

Octet 4

Spare and Instance fields

Information elements

P

Condition / Comment

IE Type

Ins.

Overload Control Sequence Number

M

See clause 12.3.5.1.2.1 for the description and use of this parameter.

Sequence Number

0

Overload Reduction Metric

M

See clause 12.3.5.1.2.3 for the description and use of this parameter.

Metric

0

Period of Validity

M

See clause 12.3.5.1.2.2 for the description and use of this parameter.

This IE should be set to "0" if the "Overload Reduction Metric" is null. This IE shall be ignored by the receiver if the "Overload Reduction Metric" is null.

EPC Timer

0