7.2.22 Release Access Bearers Response

29.2743GPP3GPP Evolved Packet System (EPS)Evolved General Packet Radio Service (GPRS) Tunnelling Protocol for Control plane (GTPv2-C)Release 18Stage 3TS

The Release Access Bearers Response message is sent on the S11 interface by the SGW to the MME as part of the S1 release procedure and eNodeB initiated Connection Suspend procedure.

It may also be sent on the S11 interface by the SGW to the MME as part of the Establishment of S1-U bearer during Data Transport in Control Plane CIoT EPS optimisation procedure (see clause 5.3.4B.4 of 3GPP TS 23.401 [3]).

NOTE: The S1 release procedure is also used to release S11-U bearers for the Control Plane CIoT EPS optimisation, except in the case of data buffering in the MME.

The message shall also be sent on the S4 interface by the SGW to the SGSN as part of the procedures:

– RAB release using S4

– Iu Release using S4

– READY to STANDBY transition within the network

Possible Cause values are specified in Table 8.4-1. Message specific cause values are:

– "Request accepted".

– "Request accepted partially".

– "Context not found".

Table 7.2.22-1: Information Element in Release Access Bearers Response

Information elements

P

Condition / Comment

IE Type

Ins.

Cause

M

Cause

0

Recovery

O

This IE shall be included if contacting the peer for the first time

Recovery

0

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 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

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

0

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

0

Private Extension

O

Private Extension

VS

Table 7.2.22-2: Load Control Information within Release Access Bearers Response

Octet 1

Load Control Information IE Type = 181 (decimal)

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

Table 7.2.22-3: Overload Control Information within Release Access Bearers Response

Octet 1

Overload Control Information IE Type = 180 (decimal)

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