9.1.3 Messages for Dual Connectivity Procedures

36.4233GPPEvolved Universal Terrestrial Radio Access Network (E-UTRAN)Release 17TSX2 Application Protocol (X2AP)

9.1.3.1 SENB ADDITION REQUEST

This message is sent by the MeNB to the SeNB to request the preparation of resources for dual connectivity operation for a specific UE

Direction: MeNB → SeNB.

IE/Group Name

Presence

Range

IE type and reference

Semantics description

Criticality

Assigned Criticality

Message Type

M

9.2.13

YES

reject

MeNB UE X2AP ID

M

eNB UE X2AP ID

9.2.24

Allocated at the MeNB

YES

reject

UE Security Capabilities

C-

ifSCGBearerOption

9.2.29

YES

reject

SeNB Security Key

C-

ifSCGBearerOption

9.2.72

The S-KeNB which is provided by the MeNB, see TS 33.401 [18].

YES

reject

SeNB UE Aggregate Maximum Bit Rate

M

UE Aggregate Maximum Bit Rate

9.2.12

The UE Aggregate Maximum Bit Rate is split into MeNB UE Aggregate Maximum Bit Rate and SeNB UE Aggregate Maximum Bit Rate which are enforced by MeNB and SeNB respectively.

YES

reject

Serving PLMN

O

PLMN Identity

9.2.4

The serving PLMN of the SCG in the SeNB.

YES

ignore

E-RABs To Be Added List

1

YES

reject

>E-RABs To Be Added Item

1 .. <maxnoofBearers>

EACH

reject

>>CHOICE Bearer Option

M

>>>SCG Bearer

>>>>E-RAB ID

M

9.2.23

–

>>>>E-RAB Level QoS Parameters

M

9.2.9

Includes necessary QoS parameters

–

>>>>DL Forwarding

O

9.2.5

–

>>>>S1 UL GTP Tunnel Endpoint

M

GTP Tunnel Endpoint 9.2.1

SGW endpoint of the S1 transport bearer. For delivery of UL PDUs.

–

>>>>Correlation ID

O

Correlation ID

9.2.84

–

>>>>SIPTO Correlation ID

O

Correlation ID

9.2.84

–

>>>>Bearer Type

O

9.2.92

YES

ignore

>>>>Ethernet Type

O

9.2.157

YES

ignore

>>>>Source DL Forwarding IP Address

O

BIT STRING (1..160, …)

Identifies the TNL address used by the source node for data forwarding.

YES

ignore

>>>Split Bearer

>>>>E-RAB ID

M

9.2.23

–

>>>>E-RAB Level QoS Parameters

M

9.2.9

Includes necessary QoS parameters

–

>>>>MeNB GTP Tunnel Endpoint

M

GTP Tunnel Endpoint 9.2.1

MeNB endpoint of the X2 transport bearer. For delivery of UL PDUs.

–

>>>>Source DL Forwarding IP Address

O

BIT STRING (1..160, …)

Identifies the TNL address used by the source node for data forwarding.

YES

ignore

MeNB to SeNB Container

M

OCTET STRING

Includes the SCG-ConfigInfo message as defined in TS 36.331 [9]

YES

reject

CSG Membership Status

O

9.2.52

YES

reject

SeNB UE X2AP ID

O

eNB UE X2AP ID

9.2.24

Allocated at the SeNB

YES

reject

SeNB UE X2AP ID Extension

O

Extended eNB UE X2AP ID

9.2.86

Allocated at the SeNB

YES

reject

Expected UE Behaviour

O

9.2.70

YES

ignore

MeNB UE X2AP ID Extension

O

Extended eNB UE X2AP ID

9.2.86

Allocated at the MeNB

YES

reject

Range bound

Explanation

maxnoofBearers

Maximum no. of E-RABs. Value is 256

Condition

Explanation

ifSCGBearerOption

This IE shall be present if the Bearer Option IE is set to the value "SCG bearer".

9.1.3.2 SENB ADDITION REQUEST ACKNOWLEDGE

This message is sent by the SeNB to confirm the MeNB about the SeNB addition preparation.

Direction: SeNB → MeNB.

IE/Group Name

Presence

Range

IE type and reference

Semantics description

Criticality

Assigned Criticality

Message Type

M

9.2.13

YES

reject

MeNB UE X2AP ID

M

eNB UE X2AP ID

9.2.24

Allocated at the MeNB

YES

reject

SeNB UE X2AP ID

M

eNB UE X2AP ID

9.2.24

Allocated at the SeNB

YES

reject

E-RABs Admitted To Be Added List

1

YES

ignore

>E-RABs Admitted To Be Added Item

1 .. <maxnoofBearers>

EACH

ignore

>>CHOICE Bearer Option

M

>>>SCG Bearer

>>>>E-RAB ID

M

9.2.23

–

>>>>S1 DL GTP Tunnel Endpoint

M

GTP Tunnel Endpoint 9.2.1

SeNB endpoint of the S1 transport bearer. For delivery of DL PDUs.

–

>>>>DL Forwarding GTP Tunnel Endpoint

O

GTP Tunnel Endpoint 9.2.1

Identifies the X2 transport bearer used for forwarding of DL PDUs

–

>>>>UL Forwarding GTP Tunnel Endpoint

O

GTP Tunnel Endpoint 9.2.1

Identifies the X2 transport bearer used for forwarding of UL PDUs

–

>>>>Source DL Forwarding IP Address

O

BIT STRING (1..160, …)

Identifies the TNL address used by the source node for data forwarding.

YES

ignore

>>>Split Bearer

>>>>E-RAB ID

M

9.2.23

–

>>>>SeNB GTP Tunnel Endpoint

M

GTP Tunnel Endpoint 9.2.1

Endpoint of the X2 transport bearer at the SeNB.

–

>>>>Source DL Forwarding IP Address

O

BIT STRING (1..160, …)

Identifies the TNL address used by the source node for data forwarding.

YES

ignore

E-RABs Not Admitted List

O

E-RAB List

9.2.28

A value for E-RAB ID shall only be present once in E-RABs Admitted List IE and in E-RABs Not Admitted List IE.

YES

ignore

SeNB to MeNB Container

M

OCTET STRING

Includes the SCG-Config message as defined in TS 36.331 [9]

YES

reject

Criticality Diagnostics

O

9.2.7

YES

ignore

GW Transport Layer Address

O

BIT STRING (1..160, …)

Indicating GW Transport Layer Address.

YES

ignore

SIPTO L-GW Transport Layer Address

O

BIT STRING (1..160, …)

Indicating SIPTO L-GW Transport Layer Address.

YES

ignore

MeNB UE X2AP ID Extension

O

Extended eNB UE X2AP ID

9.2.86

Allocated at the MeNB

YES

reject

SeNB UE X2AP ID Extension

O

Extended eNB UE X2AP ID

9.2.86

Allocated at the SeNB

YES

reject

Tunnel Information for BBF

O

Tunnel Information 9.2.89

Indicating eNB’s Local IP Address assigned by the broadband access provider, UDP port Number.

YES

ignore

Range bound

Explanation

maxnoofBearers

Maximum no. of E-RABs. Value is 256

9.1.3.3 SENB ADDITION REQUEST REJECT

This message is sent by the SeNB to inform the MeNB that the SeNB Addition Preparation has failed.

Direction: SeNB → MeNB.

IE/Group Name

Presence

Range

IE type and reference

Semantics description

Criticality

Assigned Criticality

Message Type

M

9.2.13

YES

reject

MeNB UE X2AP ID

M

eNB UE X2AP ID

9.2.24

Allocated at the MeNB

YES

reject

SeNB UE X2AP ID

M

eNB UE X2AP ID

9.2.24

Allocated at the SeNB

YES

reject

Cause

M

9.2.6

YES

ignore

Criticality Diagnostics

O

9.2.7

YES

ignore

MeNB UE X2AP ID Extension

O

Extended eNB UE X2AP ID

9.2.86

Allocated at the MeNB

YES

reject

SeNB UE X2AP ID Extension

O

Extended eNB UE X2AP ID

9.2.86

Allocated at the SeNB

YES

reject

9.1.3.4 SENB RECONFIGURATION COMPLETE

This message is sent by the MeNB to the SeNB to indicate whether the configuration requested by the SeNB was applied by the UE.

Direction: MeNB → SeNB.

IE/Group Name

Presence

Range

IE type and reference

Semantics description

Criticality

Assigned Criticality

Message Type

M

9.2.13

YES

ignore

MeNB UE X2AP ID

M

eNB UE X2AP ID

9.2.24

Allocated at the MeNB

YES

reject

SeNB UE X2AP ID

M

eNB UE X2AP ID

9.2.24

Allocated at the SeNB

YES

reject

Response Information

M

YES

ignore

>CHOICE Response Type

M

>>Configuration successfully applied

>>>MeNB to SeNB Container

O

OCTET STRING

Includes the SCG-ConfigInfo message as defined in TS 36.331 [9]

–

>>Configuration rejected by the MeNB

>>>Cause

M

9.2.6

–

>>>MeNB to SeNB Container

O

OCTET STRING

Includes the SCG-ConfigInfo message as defined in TS 36.331 [9]

–

MeNB UE X2AP ID Extension

O

Extended eNB UE X2AP ID

9.2.86

Allocated at the MeNB

YES

reject

SeNB UE X2AP ID Extension

O

Extended eNB UE X2AP ID

9.2.86

Allocated at the SeNB

YES

reject

9.1.3.5 SENB MODIFICATION REQUEST

This message is sent by the MeNB to the SeNB to request the preparation to modify SeNB resources for a specific UE.

Direction: MeNB → SeNB.

IE/Group Name

Presence

Range

IE type and reference

Semantics description

Criticality

Assigned Criticality

Message Type

M

9.2.13

YES

reject

MeNB UE X2AP ID

M

eNB UE X2AP ID

9.2.24

Allocated at the MeNB

YES

reject

SeNB UE X2AP ID

M

eNB UE X2AP ID

9.2.24

Allocated at the SeNB

YES

reject

Cause

M

9.2.6

YES

ignore

SCG Change Indication

O

9.2.73

YES

ignore

Serving PLMN

O

PLMN Identity

9.2.4

The serving PLMN of the SCG in the SeNB.

YES

ignore

UE Context Information

0..1

YES

reject

>UE Security Capabilities

O

9.2.29

–

>SeNB Security Key

O

9.2.72

–

>SeNB UE Aggregate Maximum Bit Rate

O

UE Aggregate Maximum Bit Rate

9.2.12

–

>E-RABs To Be Added List

0..1

–

>>E-RABs To Be Added Item

1 .. <maxnoofBearers>

EACH

ignore

>>>CHOICE Bearer Option

M

>>>>SCG Bearer

>>>>>E-RAB ID

M

9.2.23

–

>>>>>E-RAB Level QoS Parameters

M

9.2.9

Includes necessary QoS parameters

–

>>>>>DL Forwarding

O

9.2.5

–

>>>>>S1 UL GTP Tunnel Endpoint

M

GTP Tunnel Endpoint 9.2.1

SGW endpoint of the S1 transport bearer. For delivery of UL PDUs.

–

>>>>>Correlation ID

O

Correlation ID

9.2.84

–

>>>>>SIPTO Correlation ID

O

Correlation ID

9.2.84

–

>>>>>Bearer Type

O

9.2.92

YES

ignore

>>>>>Ethernet Type

O

9.2.157

YES

ignore

>>>>>Source DL Forwarding IP Address

O

BIT STRING (1..160, …)

Identifies the TNL address used by the source node for data forwarding.

YES

ignore

>>>>Split Bearer

>>>>>E-RAB ID

M

9.2.23

–

>>>>>E-RAB Level QoS Parameters

M

9.2.9

Includes necessary QoS parameters

–

>>>>>MeNB GTP Tunnel Endpoint

M

GTP Tunnel Endpoint 9.2.1

MeNB endpoint of the X2 transport bearer. For delivery of UL PDUs.

–

>>>>>Source DL Forwarding IP Address

O

BIT STRING (1..160, …)

Identifies the TNL address used by the source node for data forwarding.

YES

ignore

>E-RABs To Be Modified List

0..1

–

>>E-RABs To Be Modified Item

1 .. <maxnoofBearers>

EACH

ignore

>>>CHOICE Bearer Option

M

>>>>SCG Bearer

>>>>>E-RAB ID

M

9.2.23

–

>>>>>E-RAB Level QoS Parameters

O

9.2.9

Includes QoS parameters to be modified

–

>>>>>S1 UL GTP Tunnel Endpoint

O

GTP Tunnel Endpoint 9.2.1

SGW endpoint of the S1 transport bearer. For delivery of UL PDUs.

–

>>>>Split Bearer

>>>>>E-RAB ID

M

9.2.23

–

>>>>>E-RAB Level QoS Parameters

O

9.2.9

Includes QoS parameters to be modified

–

>>>>>MeNB GTP Tunnel Endpoint

O

GTP Tunnel Endpoint 9.2.1

MeNB endpoint of the X2 transport bearer. For delivery of UL PDUs.

–

>E-RABs To Be Released List

0..1

–

>>E-RABs To Be Released Item

1 .. <maxnoofBearers>

EACH

ignore

>>>CHOICE Bearer Option

M

>>>>SCG Bearer

>>>>>E-RAB ID

M

9.2.23

–

>>>>>DL Forwarding GTP Tunnel Endpoint

O

GTP Tunnel Endpoint 9.2.1

Identifies the X2 transport bearer used for forwarding of DL PDUs

–

>>>>>UL Forwarding GTP Tunnel Endpoint

O

GTP Tunnel Endpoint 9.2.1

Identifies the X2 transport bearer. used for forwarding of UL PDUs

–

>>>>Split Bearer

>>>>>E-RAB ID

M

9.2.23

–

>>>>>DL Forwarding GTP Tunnel Endpoint

O

GTP Tunnel Endpoint 9.2.1

Identifies the X2 transport bearer used for forwarding of DL PDUs

–

MeNB to SeNB Container

O

OCTET STRING

Includes the SCG-ConfigInfo message as defined in TS 36.331 [9]

YES

ignore

CSG Membership Status

O

9.2.52

YES

reject

MeNB UE X2AP ID Extension

O

Extended eNB UE X2AP ID

9.2.86

Allocated at the MeNB

YES

reject

SeNB UE X2AP ID Extension

O

Extended eNB UE X2AP ID

9.2.86

Allocated at the SeNB

YES

reject

Range bound

Explanation

maxnoofBearers

Maximum no. of E-RABs. Value is 256

9.1.3.6 SENB MODIFICATION REQUEST ACKNOWLEDGE

This message is sent by the SeNB to confirm the MeNB’s request to modify the SeNB resources for a specific UE.

Direction: SeNB → MeNB.

IE/Group Name

Presence

Range

IE type and reference

Semantics description

Criticality

Assigned Criticality

Message Type

M

9.2.13

YES

reject

MeNB UE X2AP ID

M

eNB UE X2AP ID

9.2.24

Allocated at the MeNB

YES

ignore

SeNB UE X2AP ID

M

eNB UE X2AP ID

9.2.24

Allocated at the SeNB

YES

ignore

E-RABs Admitted List

0..1

YES

ignore

>E-RABs Admitted To Be Added List

1

–

>>E-RABs Admitted To Be Added Item

1 .. <maxnoofBearers>

EACH

ignore

>>>CHOICE Bearer Option

M

>>>>SCG Bearer

>>>>>E-RAB ID

M

9.2.23

–

>>>>>S1 DL GTP Tunnel Endpoint

M

GTP Tunnel Endpoint 9.2.1

SeNB endpoint of the S1 transport bearer. For delivery of DL PDUs.

–

>>>>>DL Forwarding GTP Tunnel Endpoint

O

GTP Tunnel Endpoint 9.2.1

Identifies the X2 transport bearer used for forwarding of DL PDUs

–

>>>>>UL Forwarding GTP Tunnel Endpoint

O

GTP Tunnel Endpoint 9.2.1

Identifies the X2 transport bearer used for forwarding of UL PDUs

–

>>>>>Source DL Forwarding IP Address

O

BIT STRING (1..160, …)

Identifies the TNL address used by the source node for data forwarding.

YES

ignore

>>>>Split Bearer

>>>>>E-RAB ID

M

9.2.23

–

>>>>>SeNB GTP Tunnel Endpoint

M

GTP Tunnel Endpoint 9.2.1

Endpoint of the X2 transport bearer at the SeNB.

–

>>>>>Source DL Forwarding IP Address

O

BIT STRING (1..160, …)

Identifies the TNL address used by the source node for data forwarding.

YES

ignore

>E-RABs Admitted To Be Modified List

0..1

–

>>E-RABs Admitted To Be Modified Item

1 .. <maxnoofBearers>

EACH

ignore

>>>CHOICE Bearer Option

M

>>>>SCG Bearer

>>>>>E-RAB ID

M

9.2.23

–

>>>>>S1 DL GTP Tunnel Endpoint

O

GTP Tunnel Endpoint 9.2.1

SeNB endpoint of the S1 transport bearer. For delivery of DL PDUs.

–

>>>>Split Bearer

>>>>>E-RAB ID

M

9.2.23

–

>>>>>SeNB GTP Tunnel Endpoint

O

GTP Tunnel Endpoint 9.2.1

Endpoint of the X2 transport bearer at the SeNB.

–

>E-RABs Admitted To Be Released List

0..1

–

>>E-RABs Admitted To Be Released Item

1 .. <maxnoofBearers>

EACH

ignore

>>>CHOICE Bearer Option

M

>>>>SCG Bearer

>>>>>E-RAB ID

M

9.2.23

–

>>>>Split Bearer

>>>>>E-RAB ID

M

9.2.23

–

E-RABs Not Admitted List

O

E-RAB List

9.2.28

A value for E-RAB ID shall only be present once in E-RABs Admitted List IE and in E-RABs Not Admitted List IE.

YES

ignore

SeNB to MeNB Container

O

OCTET STRING

Includes the SCG-Config message as defined in TS 36.331 [9]

YES

ignore

Criticality Diagnostics

O

9.2.7

YES

ignore

MeNB UE X2AP ID Extension

O

Extended eNB UE X2AP ID

9.2.86

Allocated at the MeNB

YES

ignore

SeNB UE X2AP ID Extension

O

Extended eNB UE X2AP ID

9.2.86

Allocated at the SeNB

YES

Ignore

Range bound

Explanation

maxnoofBearers

Maximum no. of E-RABs. Value is 256

9.1.3.7 SENB MODIFICATION REQUEST REJECT

This message is sent by the SeNB to inform the MeNB that the MeNB initiated SeNB Modification Preparation has failed.

Direction: SeNB → MeNB.

IE/Group Name

Presence

Range

IE type and reference

Semantics description

Criticality

Assigned Criticality

Message Type

M

9.2.13

YES

reject

MeNB UE X2AP ID

M

eNB UE X2AP ID

9.2.24

Allocated at the MeNB

YES

ignore

SeNB UE X2AP ID

M

eNB UE X2AP ID

9.2.24

Allocated at the SeNB

YES

ignore

Cause

M

9.2.6

YES

ignore

Criticality Diagnostics

O

9.2.7

YES

ignore

MeNB UE X2AP ID Extension

O

Extended eNB UE X2AP ID

9.2.86

Allocated at the MeNB

YES

ignore

SeNB UE X2AP ID Extension

O

Extended eNB UE X2AP ID

9.2.86

Allocated at the SeNB

YES

ignore

9.1.3.8 SENB MODIFICATION REQUIRED

This message is sent by the SeNB to the MeNB to request the modification of SeNB resources for a specific UE.

Direction: SeNB → MeNB.

IE/Group Name

Presence

Range

IE type and reference

Semantics description

Criticality

Assigned Criticality

Message Type

M

9.2.13

YES

reject

MeNB UE X2AP ID

M

eNB UE X2AP ID

9.2.24

Allocated at the MeNB

YES

reject

SeNB UE X2AP ID

M

eNB UE X2AP ID

9.2.24

Allocated at the SeNB

YES

reject

Cause

M

9.2.6

YES

ignore

SCG Change Indication

O

9.2.73

YES

ignore

E-RABs To Be Released List

0..1

YES

ignore

>E-RABs To Be Released Item

1 .. <maxnoofBearers>

EACH

ignore

>>E-RAB ID

M

9.2.23

–

>>Cause

M

9.2.6

–

SeNB to MeNB Container

O

OCTET STRING

Includes the SCG-Config message as defined in TS 36.331 [9]

YES

ignore

MeNB UE X2AP ID Extension

O

Extended eNB UE X2AP ID

9.2.86

Allocated at the MeNB

YES

reject

SeNB UE X2AP ID Extension

O

Extended eNB UE X2AP ID

9.2.86

Allocated at the SeNB

YES

reject

Range bound

Explanation

maxnoofBearers

Maximum no. of E-RABs. Value is 256

9.1.3.9 SENB MODIFICATION CONFIRM

This message is sent by the MeNB to inform the SeNB about the successful modification.

Direction: MeNB → SeNB.

IE/Group Name

Presence

Range

IE type and reference

Semantics description

Criticality

Assigned Criticality

Message Type

M

9.2.13

YES

reject

MeNB UE X2AP ID

M

eNB UE X2AP ID

9.2.24

Allocated at the MeNB

YES

ignore

SeNB UE X2AP ID

M

eNB UE X2AP ID

9.2.24

Allocated at the SeNB

YES

ignore

MeNB to SeNB Container

O

OCTET STRING

Includes the SCG-ConfigInfo message as defined in TS 36.331 [9]

YES

ignore

Criticality Diagnostics

O

9.2.7

YES

ignore

MeNB UE X2AP ID Extension

O

Extended eNB UE X2AP ID

9.2.86

Allocated at the MeNB

YES

ignore

SeNB UE X2AP ID Extension

O

Extended eNB UE X2AP ID

9.2.86

Allocated at the SeNB

YES

ignore

9.1.3.10 SENB MODIFICATION REFUSE

This message is sent by the MeNB to inform the SeNB that the SeNB initiated SeNB Modification has failed.

Direction: MeNB → SeNB.

IE/Group Name

Presence

Range

IE type and reference

Semantics description

Criticality

Assigned Criticality

Message Type

M

9.2.13

YES

reject

MeNB UE X2AP ID

M

eNB UE X2AP ID

9.2.24

Allocated at the MeNB

YES

ignore

SeNB UE X2AP ID

M

eNB UE X2AP ID

9.2.24

Allocated at the SeNB

YES

ignore

Cause

M

9.2.6

YES

ignore

MeNB to SeNB Container

O

OCTET STRING

Includes the SCG-ConfigInfo message as defined in TS 36.331 [9]

YES

ignore

Criticality Diagnostics

O

9.2.7

YES

ignore

MeNB UE X2AP ID Extension

O

Extended eNB UE X2AP ID

9.2.86

Allocated at the MeNB

YES

ignore

SeNB UE X2AP ID Extension

O

Extended eNB UE X2AP ID

9.2.86

Allocated at the SeNB

YES

ignore

9.1.3.11 SENB RELEASE REQUEST

This message is sent by the MeNB to the SeNB to request the release of resources.

Direction: MeNB → SeNB.

IE/Group Name

Presence

Range

IE type and reference

Semantics description

Criticality

Assigned Criticality

Message Type

M

9.2.13

YES

ignore

MeNB UE X2AP ID

M

eNB UE X2AP ID

9.2.24

Allocated at the MeNB

YES

reject

SeNB UE X2AP ID

O

eNB UE X2AP ID

9.2.24

Allocated at the SeNB

YES

reject

Cause

O

9.2.6

YES

ignore

E-RABs To Be Released List

0..1

YES

ignore

> E-RABs To Be Released Item

1 .. <maxnoofBearers>

EACH

ignore

>>CHOICE Bearer Option

M

>>>SCG Bearer

>>>>E-RAB ID

M

9.2.23

–

>>>>UL Forwarding GTP Tunnel Endpoint

O

GTP Tunnel Endpoint 9.2.1

Identifies the X2 transport bearer used for forwarding of UL PDUs

–

>>>>DL Forwarding GTP Tunnel Endpoint

O

GTP Tunnel Endpoint 9.2.1

Identifies the X2 transport bearer. used for forwarding of DL PDUs

–

>>>Split Bearer

>>>>E-RAB ID

M

9.2.23

–

>>>>DL Forwarding GTP Tunnel Endpoint

O

GTP Tunnel Endpoint 9.2.1

Identifies the X2 transport bearer. used for forwarding of DL PDUs

–

UE Context Kept Indicator

O

9.2.85

YES

ignore

MeNB UE X2AP ID Extension

O

Extended eNB UE X2AP ID

9.2.86

Allocated at the MeNB

YES

reject

SeNB UE X2AP ID Extension

O

Extended eNB UE X2AP ID

9.2.86

Allocated at the SeNB

YES

reject

MakeBeforeBreak Indicator

O

ENUMERATED (True, …)

YES

ignore

Range bound

Explanation

maxnoofBearers

Maximum no. of E-RABs. Value is 256

9.1.3.12 SENB RELEASE REQUIRED

This message is sent by the SeNB to request the release of all resources for a specific UE at the SeNB.

Direction: SeNB → MeNB.

IE/Group Name

Presence

Range

IE type and reference

Semantics description

Criticality

Assigned Criticality

Message Type

M

9.2.13

YES

reject

MeNB UE X2AP ID

M

eNB UE X2AP ID

9.2.24

Allocated at the MeNB

YES

reject

SeNB UE X2AP ID

M

eNB UE X2AP ID

9.2.24

Allocated at the SeNB

YES

reject

Cause

M

9.2.6

YES

ignore

MeNB UE X2AP ID Extension

O

Extended eNB UE X2AP ID

9.2.86

Allocated at the MeNB

YES

reject

SeNB UE X2AP ID Extension

O

Extended eNB UE X2AP ID

9.2.86

Allocated at the SeNB

YES

reject

9.1.3.13 SENB RELEASE CONFIRM

This message is sent by the MeNB to confirm the release of all resources for a specific UE at the SeNB.

Direction: MeNB → SeNB.

IE/Group Name

Presence

Range

IE type and reference

Semantics description

Criticality

Assigned Criticality

Message Type

M

9.2.13

YES

reject

MeNB UE X2AP ID

M

eNB UE X2AP ID

9.2.24

Allocated at the MeNB

YES

ignore

SeNB UE X2AP ID

M

eNB UE X2AP ID

9.2.24

Allocated at the SeNB

YES

ignore

E-RABs to be Released List

0..1

YES

ignore

>E-RABs To Be Released Item

1 .. <maxnoofBearers>

–

>>CHOICE Bearer Option

M

>>>SCG Bearer

>>>>E-RAB ID

M

9.2.23

–

>>>>UL Forwarding GTP Tunnel Endpoint

O

GTP Tunnel Endpoint 9.2.1

Identifies the X2 transport bearer used for forwarding of UL PDUs

–

>>>>DL Forwarding GTP Tunnel Endpoint

O

GTP Tunnel Endpoint 9.2.1

Identifies the X2 transport bearer used for forwarding of DL PDUs

–

>>>Split Bearer

>>>>E-RAB ID

M

9.2.23

–

>>>>DL Forwarding GTP Tunnel Endpoint

O

GTP Tunnel Endpoint 9.2.1

Identifies the X2 transport bearer used for forwarding of DL PDUs

–

Criticality Diagnostics

O

9.2.7

YES

ignore

MeNB UE X2AP ID Extension

O

Extended eNB UE X2AP ID

9.2.86

Allocated at the MeNB

YES

ignore

SeNB UE X2AP ID Extension

O

Extended eNB UE X2AP ID

9.2.86

Allocated at the SeNB

YES

ignore

Range bound

Explanation

maxnoofBearers

Maximum no. of E-RABs. Value is 256

9.1.3.14 SENB COUNTER CHECK REQUEST

This message is sent by the SeNB to request the verification of the value of the PDCP COUNTs associated with SCG bearers established in the SeNB.

Direction: SeNB → MeNB.

IE/Group Name

Presence

Range

IE type and reference

Semantics description

Criticality

Assigned Criticality

Message Type

M

9.2.13

YES

reject

MeNB UE X2AP ID

M

eNB UE X2AP ID

9.2.24

Allocated at the MeNB

YES

ignore

SeNB UE X2AP ID

M

eNB UE X2AP ID

9.2.24

Allocated at the SeNB

YES

ignore

E-RABs Subject to

Counter Check List

1

YES

ignore

>E-RABs Subject to Counter Check Item

1 .. <maxnoofBearers>

EACH

ignore

>>E-RAB ID

M

9.2.23

–

>>UL COUNT

M

INTEGER(0.. 4294967295)

Indicates the value of uplink COUNT associated to this E-RAB.

–

>>DL COUNT

M

INTEGER(0.. 4294967295)

Indicates the value of downlink COUNT associated to this E-RAB.

–

MeNB UE X2AP ID Extension

O

Extended eNB UE X2AP ID

9.2.86

Allocated at the MeNB

YES

ignore

SeNB UE X2AP ID Extension

O

Extended eNB UE X2AP ID

9.2.86

Allocated at the SeNB

YES

ignore

Range bound

Explanation

maxnoofBearers

Maximum no. of E-RABs. Value is 256