9.1.1 Messages for Basic Mobility Procedures
36.4233GPPEvolved Universal Terrestrial Radio Access Network (E-UTRAN)Release 17TSX2 Application Protocol (X2AP)
9.1.1.1 HANDOVER REQUEST
This message is sent by the source eNB to the target eNB to request the preparation of resources for a handover.
Direction: source eNB → target eNB.
|
IE/Group Name |
Presence |
Range |
IE type and reference |
Semantics description |
Criticality |
Assigned Criticality |
|
Message Type |
M |
9.2.13 |
YES |
reject |
||
|
Old eNB UE X2AP ID |
M |
eNB UE X2AP ID 9.2.24 |
Allocated at the source eNB |
YES |
reject |
|
|
Cause |
M |
9.2.6 |
YES |
ignore |
||
|
Target Cell ID |
M |
ECGI 9.2.14 |
YES |
reject |
||
|
GUMMEI |
M |
9.2.16 |
YES |
reject |
||
|
UE Context Information |
1 |
YES |
reject |
|||
|
>MME UE S1AP ID |
M |
INTEGER (0..232 -1) |
MME UE S1AP ID allocated at the MME |
– |
||
|
>UE Security Capabilities |
M |
9.2.29 |
– |
|||
|
>AS Security Information |
M |
9.2.30 |
– |
|||
|
>UE Aggregate Maximum Bit Rate |
M |
9.2.12 |
– |
|||
|
>Subscriber Profile ID for RAT/Frequency priority |
O |
9.2.25 |
– |
|||
|
>E-RABs To Be Setup List |
1 |
– |
||||
|
>>E-RABs To Be Setup Item |
1 .. <maxnoofBearers> |
EACH |
ignore |
|||
|
>>>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 |
– |
|||
|
>>>UL GTP Tunnel Endpoint |
M |
GTP Tunnel Endpoint 9.2.1 |
SGW endpoint of the S1 transport bearer. For delivery of UL PDUs. |
– |
||
|
>>>Bearer Type |
O |
9.2.92 |
YES |
reject |
||
|
>>>DAPS Request Information |
O |
9.2.154 |
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 |
|
|
>>>Security Indication |
O |
9.2.181 |
YES |
reject |
||
|
>RRC Context |
M |
OCTET STRING |
Includes the RRC HandoverPreparationInformation message as defined in subclause 10.2.2 of TS 36.331 [9], or the RRC HandoverPreparationInformation-NB message as defined in 10.6.2 of TS 36.331 [9]. |
– |
||
|
>Handover Restriction List |
O |
9.2.3 |
– |
|||
|
>Location Reporting Information |
O |
9.2.21 |
Includes the necessary parameters for location reporting |
– |
||
|
>Management Based MDT Allowed |
O |
9.2.59 |
YES |
ignore |
||
|
>Management Based MDT PLMN List |
O |
MDT PLMN List 9.2.64 |
YES |
ignore |
||
|
>UE Sidelink Aggregate Maximum Bit Rate |
O |
9.2.97 |
This IE applies only if the UE is authorized for V2X services. |
YES |
ignore |
|
|
>EPC Handover Restriction List Container |
O |
9.2.153 |
YES |
ignore |
||
|
>Additional RRM Policy Index |
O |
9.2.25a |
YES |
ignore |
||
|
>NR UE Sidelink Aggregate Maximum Bit Rate |
O |
9.2.159 |
This IE applies only if the UE is authorized for NR V2X services. |
YES |
ignore |
|
|
>UE Radio Capability ID |
O |
9.2.171 |
YES |
reject |
||
|
>IMS voice EPS fallback from 5G |
O |
ENUMERATED (true, …) |
YES |
ignore |
||
|
UE History Information |
M |
9.2.38 |
Same definition as in TS 36.413 [4] |
YES |
ignore |
|
|
Trace Activation |
O |
9.2.2 |
YES |
ignore |
||
|
SRVCC Operation Possible |
O |
9.2.33 |
YES |
ignore |
||
|
CSG Membership Status |
O |
9.2.52 |
YES |
reject |
||
|
Mobility Information |
O |
BIT STRING (SIZE (32)) |
Information related to the handover; the source eNB provides it in order to enable later analysis of the conditions that led to a wrong HO. |
YES |
ignore |
|
|
Masked IMEISV |
O |
9.2.69 |
YES |
ignore |
||
|
UE History Information from the UE |
O |
OCTET STRING |
VisitedCellInfoList contained in the UEInformationResponse message (TS 36.331 [9]) |
YES |
ignore |
|
|
Expected UE Behaviour |
O |
9.2.70 |
YES |
ignore |
||
|
ProSe Authorized |
O |
9.2.78 |
YES |
ignore |
||
|
UE Context Reference at the SeNB |
O |
YES |
ignore |
|||
|
>Global SeNB ID |
M |
Global eNB ID 9.2.22 |
– |
|||
|
>SeNB UE X2AP ID |
M |
eNB UE X2AP ID 9.2.24 |
Allocated at the SeNB |
– |
||
|
>SeNB UE X2AP ID Extension |
O |
Extended eNB UE X2AP ID 9.2.86 |
Allocated at the SeNB |
– |
||
|
Old eNB UE X2AP ID Extension |
O |
Extended eNB UE X2AP ID 9.2.86 |
Allocated at the source eNB |
YES |
reject |
|
|
V2X Services Authorized |
O |
9.2.93 |
YES |
ignore |
||
|
UE Context Reference at the WT |
O |
YES |
ignore |
|||
|
>WT ID |
M |
9.2.95 |
– |
|||
|
>WT UE XwAP ID |
M |
9.2.96 |
– |
|||
|
NR UE Security Capabilities |
O |
9.2.107 |
YES |
ignore |
||
|
UE Context Reference at the SgNB |
O |
YES |
ignore |
|||
|
>Global en-gNB ID |
M |
9.2.112 |
– |
|||
|
>SgNB UE X2AP ID |
M |
en-gNB UE X2AP ID 9.2.100 |
Allocated at the SgNB. |
– |
||
|
Aerial UE subscription information |
O |
9.2.129 |
YES |
ignore |
||
|
Subscription Based UE Differentiation Information |
O |
9.2.136 |
YES |
ignore |
||
|
Conditional Handover Information Request |
O |
YES |
reject |
|||
|
>CHO Trigger |
M |
ENUMERATED (CHO-initiation, CHO-replace, …) |
– |
|||
|
>New eNB UE X2AP ID |
C-ifCHOmod |
eNB UE X2AP ID 9.2.24 |
Allocated at the target eNB |
– |
||
|
>New eNB UE X2AP ID Extension |
O |
Extended eNB UE X2AP ID 9.2.86 |
Allocated at the target eNB |
– |
||
|
>Estimated Arrival Probability |
O |
INTEGER (1..100) |
– |
|||
|
NR V2X Services Authorized |
O |
9.2.158 |
YES |
ignore |
||
|
PC5 QoS Parameters |
O |
9.2.160 |
This IE applies only if the UE is authorized for NR V2X services. |
YES |
ignore |
|
|
IAB Node Indication |
O |
ENUMERATED (true, …) |
YES |
reject |
|
Range bound |
Explanation |
|
maxnoofBearers |
Maximum no. of E-RABs. Value is 256 |
|
maxnoofMDTPLMNs |
PLMNs in the Management Based MDT PLMN list. Value is 16. |
|
Condition |
Explanation |
|
ifCHOmod |
This IE shall be present if the CHO Trigger IE is present and set to "CHO-replace". |
9.1.1.2 HANDOVER REQUEST ACKNOWLEDGE
This message is sent by the target eNB to inform the source eNB about the prepared resources at the target.
Direction: target eNB → source eNB.
|
IE/Group Name |
Presence |
Range |
IE type and reference |
Semantics description |
Criticality |
Assigned Criticality |
|
Message Type |
M |
9.2.13 |
YES |
reject |
||
|
Old eNB UE X2AP ID |
M |
eNB UE X2AP ID 9.2.24 |
Allocated at the source eNB |
YES |
ignore |
|
|
New eNB UE X2AP ID |
M |
eNB UE X2AP ID 9.2.24 |
Allocated at the target eNB |
YES |
ignore |
|
|
E-RABs Admitted List |
1 |
YES |
ignore |
|||
|
>E-RABs Admitted Item |
1 .. <maxnoofBearers> |
EACH |
ignore |
|||
|
>>E-RAB ID |
M |
9.2.23 |
– |
|||
|
>>UL GTP Tunnel Endpoint |
O |
GTP Tunnel Endpoint 9.2.1 |
Identifies the X2 transport bearer used for forwarding of UL PDUs |
– |
||
|
>>DL GTP Tunnel Endpoint |
O |
GTP Tunnel Endpoint 9.2.1 |
Identifies the X2 transport bearer. used for forwarding of DL PDUs |
– |
||
|
>>DAPS Response Information |
O |
9.2.155 |
YES |
reject |
||
|
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 |
|
|
Target eNB To Source eNB Transparent Container |
M |
OCTET STRING |
Includes the RRC E-UTRA Handover Command message as defined in subclause 10.2.2 in TS 36.331 [9] |
YES |
ignore |
|
|
Criticality Diagnostics |
O |
9.2.7 |
YES |
ignore |
||
|
UE Context Kept Indicator |
O |
9.2.85 |
YES |
ignore |
||
|
Old eNB UE X2AP ID Extension |
O |
Extended eNB UE X2AP ID 9.2.86 |
Allocated at the source eNB |
YES |
ignore |
|
|
New eNB UE X2AP ID Extension |
O |
Extended eNB UE X2AP ID 9.2.86 |
Allocated at the target eNB |
YES |
reject |
|
|
WT UE Context Kept Indicator |
O |
UE Context Kept Indicator 9.2.85 |
Indicates that the WT has acknowledged to keep the UE context |
YES |
ignore |
|
|
E-RABs transferred to MeNB |
O |
E-RAB List 9.2.28 |
In case of EN-DC, indicates that SN Status is needed for the listed E-RABs from the SgNB.. |
YES |
ignore |
|
|
Conditional Handover Information Acknowledge |
O |
YES |
reject |
|||
|
>Requested Target Cell ID |
M |
ECGI 9.2.14 |
Target cell indicated in the corresponding HANDOVER REQUEST message |
– |
||
|
>Maximum Number of CHO Preparations |
O |
9.2.156 |
– |
|
Range bound |
Explanation |
|
maxnoofBearers |
Maximum no. of E-RABs. Value is 256 |
9.1.1.3 HANDOVER PREPARATION FAILURE
This message is sent by the target eNB to inform the source eNB that the Handover Preparation has failed.
Direction: target eNB → source eNB.
|
IE/Group Name |
Presence |
Range |
IE type and reference |
Semantics description |
Criticality |
Assigned Criticality |
|
Message Type |
M |
9.2.13 |
YES |
reject |
||
|
Old eNB UE X2AP ID |
M |
eNB UE X2AP ID 9.2.24 |
Allocated at the source eNB |
YES |
ignore |
|
|
Cause |
M |
9.2.6 |
YES |
ignore |
||
|
Criticality Diagnostics |
O |
9.2.7 |
YES |
ignore |
||
|
Old eNB UE X2AP ID Extension |
O |
Extended eNB UE X2AP ID 9.2.86 |
Allocated at the source eNB |
YES |
ignore |
|
|
Requested Target Cell ID |
O |
ECGI 9.2.14 |
Target cell indicated in the corresponding HANDOVER REQUEST message |
YES |
reject |
9.1.1.4 SN STATUS TRANSFER
This message is sent by the source eNB to the target eNB to transfer the uplink/downlink PDCP SN and HFN status during a handover or for EN-DC.
Direction: source eNB → target eNB (handover), eNB from which the E-RAB context is transferred → eNB to which the E-RAB context is transferred (RRC connection re-establishment or dual connectivity), MeNB/en-gNB from which the E-RAB context is transferred → en-gNB/MeNB to which the E-RAB context is transferred (EN-DC).
|
IE/Group Name |
Presence |
Range |
IE type and reference |
Semantics description |
Criticality |
Assigned Criticality |
|
Message Type |
M |
9.2.13 |
YES |
ignore |
||
|
Old eNB UE X2AP ID |
M |
eNB UE X2AP ID 9.2.24 |
Allocated for handover at the source eNB and for dual connectivity/EN-DC at the eNB from which the E-RAB context is transferred |
YES |
reject |
|
|
New eNB UE X2AP ID |
M |
eNB UE X2AP ID 9.2.24 |
Allocated for handover at the target eNB and for dual connectivity/EN-DC at the eNB to which the E-RAB context is transferred |
YES |
reject |
|
|
E-RABs Subject To Status Transfer List |
1 |
YES |
ignore |
|||
|
>E-RABs Subject To Status Transfer Item |
1 .. <maxnoofBearers> |
EACH |
ignore |
|||
|
>>E-RAB ID |
M |
9.2.23 |
– |
|||
|
>>Receive Status Of UL PDCP SDUs |
O |
BIT STRING (4096) |
PDCP Sequence Number = (First Missing SDU Number + bit position) modulo 4096 0: PDCP SDU has not been received. 1: PDCP SDU has been received correctly. |
– |
||
|
>>UL COUNT Value |
M |
COUNT Value 9.2.15 |
PDCP-SN and Hyper Frame Number of the first missing UL SDU in case of 12 bit long PDCP-SN |
– |
||
|
>>DL COUNT Value |
M |
COUNT Value 9.2.15 |
PDCP-SN and Hyper frame number that the target eNB/en-gNB should assign for the next DL SDU not having an SN yet in case of 12 bit long PDCP-SN |
– |
||
|
>>Receive Status Of UL PDCP SDUs Extended |
O |
BIT STRING (1..16384) |
The IE is used in case of 15 bit long PDCP-SN in this release. The first bit indicates the status of the SDU after the First Missing UL PDCP SDU. The Nth bit indicates the status of the UL PDCP SDU in position (N + First Missing SDU Number) modulo (1 + the maximum value of the PDCP-SN). 0: PDCP SDU has not been received. 1: PDCP SDU has been received correctly. |
YES |
ignore |
|
|
>>UL COUNT Value Extended |
O |
COUNT Value Extended 9.2.66 |
PDCP-SN and Hyper Frame Number of the first missing UL SDU in case of 15 bit long PDCP-SN |
YES |
ignore |
|
|
>>DL COUNT Value Extended |
O |
COUNT Value Extended 9.2.66 |
PDCP-SN and Hyper Frame Number that the target eNB/en-gNB should assign for the next DL SDU not having an SN yet in case of 15 bit long PDCP-SN |
YES |
ignore |
|
|
>>Receive Status Of UL PDCP SDUs for PDCP SN Length 18 |
O |
BIT STRING (1..131072) |
The IE is used in case of 18 bit long PDCP-SN. The first bit indicates the status of the SDU after the First Missing UL PDCP SDU. The Nth bit indicates the status of the UL PDCP SDU in position (N + First Missing SDU Number) modulo (1 + the maximum value of the PDCP-SN). 0: PDCP SDU has not been received. 1: PDCP SDU has been received correctly. |
YES |
ignore |
|
|
>>UL COUNT Value for PDCP SN Length 18 |
O |
COUNT Value for PDCP SN Length 18 9.2.82 |
PDCP-SN and Hyper Frame Number of the first missing UL SDU in case of 18 bit long PDCP-SN |
YES |
ignore |
|
|
>>DL COUNT Value for PDCP SN Length 18 |
O |
COUNT Value for PDCP SN Length 18 9.2.82 |
PDCP-SN and Hyper Frame Number that the target eNB/en-gNB should assign for the next DL SDU not having an SN yet in case of 18 bit long PDCP-SN |
YES |
ignore |
|
|
Old eNB UE X2AP ID Extension |
O |
Extended eNB UE X2AP ID 9.2.86 |
Allocated for handover at the source eNB and for dual connectivity/EN-DC at the eNB from which the E-RAB context is transferred. |
YES |
reject |
|
|
New eNB UE X2AP ID Extension |
O |
Extended eNB UE X2AP ID 9.2.86 |
Allocated for handover at the target eNB and for dual connectivity/EN-DC at the eNB to which the E-RAB context is transferred. |
YES |
reject |
|
|
SgNB UE X2AP ID |
O |
en-gNB UE X2AP ID 9.2.100 |
Allocated for EN-DC at the SgNB. |
YES |
ignore |
|
Range bound |
Explanation |
|
maxnoofBearers |
Maximum no. of E-RABs. Value is 256. |
9.1.1.5 UE CONTEXT RELEASE
This message is sent by the target eNB to the source eNB to indicate that resources can be released.
Direction: target eNB → source eNB (handover), MeNB → SeNB (dual connectivity), MeNB → en-gNB (EN-DC).
|
IE/Group Name |
Presence |
Range |
IE type and reference |
Semantics description |
Criticality |
Assigned Criticality |
|
Message Type |
M |
9.2.13 |
YES |
ignore |
||
|
Old eNB UE X2AP ID |
M |
eNB UE X2AP ID 9.2.24 |
Allocated for handover at the source eNB and for dual connectivity at the SeNB. |
YES |
reject |
|
|
New eNB UE X2AP ID |
M |
eNB UE X2AP ID 9.2.24 |
Allocated for handover at the target eNB and for dual connectivity/EN-DC at the MeNB. |
YES |
reject |
|
|
Old eNB UE X2AP ID Extension |
O |
Extended eNB UE X2AP ID 9.2.86 |
Allocated for handover at the source eNB and for dual connectivity at the SeNB. |
YES |
reject |
|
|
New eNB UE X2AP ID Extension |
O |
Extended eNB UE X2AP ID 9.2.86 |
Allocated for handover at the source eNB and for dual connectivity/EN-DC at the MeNB. |
YES |
reject |
|
|
SIPTO Bearer Deactivation Indication |
O |
ENUMERATED (True, …) |
Indicates that SIPTO@LN PDN connection deactivation is needed. |
YES |
ignore |
|
|
SgNB UE X2AP ID |
O |
en-gNB UE X2AP ID 9.2.100 |
Allocated for EN-DC at the SgNB. |
YES |
ignore |
9.1.1.6 HANDOVER CANCEL
This message is sent by the source eNB to the target eNB to cancel an ongoing handover.
Direction: source eNB → target eNB.
|
IE/Group Name |
Presence |
Range |
IE type and reference |
Semantics description |
Criticality |
Assigned Criticality |
|
Message Type |
M |
9.2.13 |
YES |
ignore |
||
|
Old eNB UE X2AP ID |
M |
eNB UE X2AP ID 9.2.24 |
Allocated at the source eNB |
YES |
reject |
|
|
New eNB UE X2AP ID |
O |
eNB UE X2AP ID 9.2.24 |
Allocated at the target eNB |
YES |
ignore |
|
|
Cause |
M |
9.2.6 |
YES |
ignore |
||
|
Old eNB UE X2AP ID Extension |
O |
Extended eNB UE X2AP ID 9.2.86 |
Allocated at the source eNB |
YES |
reject |
|
|
New eNB UE X2AP ID Extension |
O |
Extended eNB UE X2AP ID 9.2.86 |
Allocated at the target eNB |
YES |
ignore |
|
|
Candidate Cells To Be Cancelled List |
0 .. <maxnoofCellsinCHO> |
YES |
reject |
|||
|
>Target Cell ID |
M |
ECGI 9.2.14 |
– |
|
Range bound |
Explanation |
|
maxnoofCellsinCHO |
Maximum no. cells that can be prepared for a conditional handover. Value is 8. |
9.1.1.7 HANDOVER SUCCESS
This message is sent by the target eNB to the source eNB to indicate the successful access of the UE toward the target eNB.
Direction: target eNB → source eNB.
|
IE/Group Name |
Presence |
Range |
IE type and reference |
Semantics description |
Criticality |
Assigned Criticality |
|
Message Type |
M |
9.2.13 |
YES |
ignore |
||
|
Old eNB UE X2AP ID |
M |
eNB UE X2AP ID 9.2.24 |
Allocated at the source eNB |
YES |
reject |
|
|
New eNB UE X2AP ID |
M |
eNB UE X2AP ID 9.2.24 |
Allocated at the target eNB |
YES |
reject |
|
|
Old eNB UE X2AP ID Extension |
O |
Extended eNB UE X2AP ID 9.2.86 |
Allocated at the source eNB |
YES |
ignore |
|
|
New eNB UE X2AP ID Extension |
O |
Extended eNB UE X2AP ID 9.2.86 |
Allocated at the target eNB |
YES |
ignore |
|
|
Target Cell ID |
M |
ECGI 9.2.14 |
Target cell indicated in the corresponding Handover Preparation procedure |
YES |
reject |
9.1.1.8 CONDITIONAL HANDOVER CANCEL
This message is sent by the target eNB to the source eNB to cancel an ongoing conditional handover.
Direction: target eNB → source eNB.
|
IE/Group Name |
Presence |
Range |
IE type and reference |
Semantics description |
Criticality |
Assigned Criticality |
|
Message Type |
M |
9.2.13 |
YES |
ignore |
||
|
Old eNB UE X2AP ID |
M |
eNB UE X2AP ID 9.2.24 |
Allocated at the source eNB |
YES |
ignore |
|
|
New eNB UE X2AP ID |
M |
eNB UE X2AP ID 9.2.24 |
Allocated at the target eNB |
YES |
reject |
|
|
Cause |
M |
9.2.6 |
YES |
ignore |
||
|
Old eNB UE X2AP ID Extension |
O |
Extended eNB UE X2AP ID 9.2.86 |
Allocated at the source eNB |
YES |
ignore |
|
|
New eNB UE X2AP ID Extension |
O |
Extended eNB UE X2AP ID 9.2.86 |
Allocated at the target eNB |
YES |
reject |
|
|
Candidate Cells To Be Cancelled List |
0 .. <maxnoofCellsinCHO> |
YES |
reject |
|||
|
>Target Cell ID |
M |
ECGI 9.2.14 |
– |
|
Range bound |
Explanation |
|
maxnoofCellsinCHO |
Maximum no. cells that can be prepared for a conditional handover. Value is 8. |
9.1.1.9 EARLY STATUS TRANSFER
This message is sent by the source eNB to the target eNB to transfer the COUNT value related to the forwarded downlink SDUs during DAPS Handover or Conditional Handover.
During a Conditional Handover with EN-DC or Dual Connectivity, or CPAC in EN-DC, this message is also used to transfer the COUNT value related to the forwarded downlink SDUs. In case of EN-DC, the COUNT value is transferred from the en-gNB to the eNB, while in case of Dual Connectivity, the COUNT value is transferred from the SeNB to the MeNB. In case of Conditional PSCell Addition, the COUNT value is transferred from the eNB to the en-gNB. In case of Conditional PSCell Change, the COUNT value is transferred from the source en-gNB to the eNB, and from eNB to the target en-gNB.
Direction: source eNB → target eNB (DAPS Handover or Conditional Handover).
Direction: en-gNB → MeNB (Conditional Handover with EN-DC), SeNB → MeNB (Conditional Handover with Dual Connectivity)
Direction: eNB → en-gNB (Conditional PSCell Addition)
Direction: source en-gNB → eNB, eNB → target en-gNB (Conditional PSCell Change)
|
IE/Group Name |
Presence |
Range |
IE type and reference |
Semantics description |
Criticality |
Assigned Criticality |
|
Message Type |
M |
9.2.13 |
YES |
ignore |
||
|
Old eNB UE X2AP ID |
M |
eNB UE X2AP ID 9.2.24 |
Allocated for DAPS handover or Conditional handover at the source eNB |
YES |
reject |
|
|
New eNB UE X2AP ID |
M |
eNB UE X2AP ID 9.2.24 |
Allocated for DAPS handover or Conditional handover at the target eNB |
YES |
reject |
|
|
Old eNB UE X2AP ID Extension |
O |
Extended eNB UE X2AP ID 9.2.86 |
Allocated for DAPS handover or Conditional handover at the source eNB |
YES |
reject |
|
|
New eNB UE X2AP ID Extension |
O |
Extended eNB UE X2AP ID 9.2.86 |
Allocated for DAPS handover or Conditional handover at the target eNB |
YES |
reject |
|
|
CHOICE Procedure Stage |
M |
YES |
reject |
|||
|
>First DL COUNT |
||||||
|
>>E-RABs Subject To Early Status Transfer List |
1 .. <maxnoofBearers> |
– |
||||
|
>>>E-RABs Subject To Early Status Transfer Item |
– |
|||||
|
>>>>E-RAB ID |
M |
9.2.23 |
– |
|||
|
>>>>FIRST DL COUNT Value |
M |
COUNT Value 9.2.15 |
PDCP-SN and Hyper frame number of the first DL SDU that the source eNB/SeNB/en-gNB forwards to the target eNB/MeNB in case of 12 bit long PDCP-SN |
– |
||
|
>>>>FIRST DL COUNT Value Extended |
O |
COUNT Value Extended 9.2.66 |
PDCP-SN and Hyper frame number of the first DL SDU that the source eNB/SeNB/en-gNB forwards to the target eNB/MeNB in case of 15 bit long PDCP-SN |
– |
||
|
>>>>FIRST DL COUNT Value for PDCP SN Length 18 |
O |
COUNT Value for PDCP SN Length 18 9.2.82 |
PDCP-SN and Hyper frame number of the first DL SDU that the source eNB/SeNB/en-gNB forwards to the target eNB/MeNB in case of 18 bit long PDCP-SN |
– |
||
|
>DL Discarding |
||||||
|
>>E-RABs Subject To DL Discarding List |
M |
1 |
– |
|||
|
>>>E-RABs Subject To DL Discarding Item |
1 .. <maxnoofBearers> |
– |
||||
|
>>>>E-RAB ID |
M |
9.2.23 |
– |
|||
|
>>>>DISCARD DL COUNT Value |
M |
COUNT Value 9.2.15 |
PDCP-SN and Hyper frame number for which the target eNB/MeNB should discard forwarded DL SDUs associated with lower values in case of 12 bit long PDCP-SN |
– |
||
|
>>>>DISCARD DL COUNT Value Extended |
O |
COUNT Value Extended 9.2.66 |
PDCP-SN and Hyper frame number for which the target eNB/MeNB should discard forwarded DL SDUs associated with lower values in case of 15 bit long PDCP-SN |
– |
||
|
>>>>DISCARD DL COUNT Value for PDCP SN Length 18 |
O |
COUNT Value for PDCP SN Length 18 9.2.82 |
PDCP-SN and Hyper frame number for which the target eNB/MeNB should discard forwarded DL SDUs associated with lower values in case of 18 bit long PDCP-SN |
– |
||
|
SgNB UE X2AP ID |
O |
en-gNB UE X2AP ID 9.2.100 |
Allocated for EN-DC at the en-gNB. |
YES |
ignore |
|
Range bound |
Explanation |
|
maxnoofBearers |
Maximum no. of E-RABs. Value is 256. |