RA57331-V-5G19A
5G Performance Aspects in Trials and Pilots
Basic signaling and procedure verification
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Module Objective
After completing this learning element, the participant should be able to:
Explain Secondary Node Addition Procedure
Repeat X2 Link Management
Locate UE Context Setup
Define Handover
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Index
Secondary Node Addition Procedure
X2 Link Management
UE Context Setup
Handover
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Index
Secondary Node Addition Procedure
X2 Link Management
UE Context Setup
Handover
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Secondary Node Addition Procedure
Overview
UE
MN
SN
S-GW
1. SgNB Addition Request
2. SgNB Addition Request Acknowledge
3. RRCConnectionReconfiguration
4. RRCConnectionReconfigurationComplete
5. SgNB Reconfiguration Complete
6. Random Access Procedure
7. SN Status Transfer
8. Data Forwarding
Path Update procedure
11. End Marker Packet
9. E-RAB Modification Indication
10. Bearer Modication
12. E-RAB Modification Confirm
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MME
Secondary Node Addition Procedure
Successful SgNB Connection Establishment
The X2_SgNB_Add_REQ_RECEIVED is
Incremented when X2AP SgNB
Addition Request is received by gNB.
The X2_SgNB_Add_REQ_ACK_SENT is
Incremented when X2AP SgNB
Reconfiguration Complete is received
by gNB.
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Note to trainer:
Ue Congext Setup Req should be change to Ue Context Setup Req
* Source document (5G Message Sequence Charts with PM Counters for 5G18A by
Mayank Chandla version 1.5 28.11.2018)
Secondary Node Addition Procedure
F1 Ue Context Setup
NF1CC_UECTXT_STP_REQSENT Incremented when F1AP:
UE CONTEXT SETUP REQUEST is sent by gNB‐CU
NF1CD_UECTXT_STP_REQRECD Incremented when F1AP:
UE CONTEXT SETUP REQUEST is received in gNB‐DU
NF1CC_UECTXT_STP_RESPRECD Incremented when F1AP:
UE CONTEXT SETUP RESPONSE is received at gNB‐CU
NF1CD_UECTXT_STP_RESPSENT Incremented when F1AP:
UE CONTEXT SETUP RESPONSE is sent from gNB‐DU
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Secondary Node Addition Procedure
Successful SN Status Transfer
X2_SGNB_RECONF_RECEIVED Incremented when X2AP
SgNB Reconfiguration Complete is received by gNB.
X2_SGNB_RECONF_ACK_RECEIVED Incremented when X2AP
SgNB Reconfiguration Complete is received with
Configuration successfully applied IE by gNB.
X2_SN_STATUS_TRANSFER_RECEIVED Incremented when
X2AP SN Status Transfer is received by gNB.
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Secondary Node Addition Procedure
SgNB Addition Reject due to unsuccessful Ue Context Setup
X2_SGNB_ADD_REQ_REJ_SENT Incremented when X2AP SgNB
Addition Request Reject is sent by gNB.
X2_SGNB_REQ_REJ_MISSING_UE_CAP:SgNBAdditionRequestReject
due to missing UE Capabilities, incremented when X2AP SgNB
Addition Request is received and does not contain UE Capabilities
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Secondary Node Addition Procedure
SgNB Addition Failures due to SCG configuration rejection
X2_SGNB_RECONF_NACK_RECEIVED Incremented when
X2AP SgNB Reconfiguration Complete is received with
Configuration rejected IE by gNB.
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Secondary Node Addition Procedure
SgNB Addition Failure Due to SN Status Transfer not received
X2_SN_STATUS_TRANSFER_T Incremented when
TimerX2UeProcGuard timer expires while waiting
for the X2AP SN Status Transfer from MeNB
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Index
Secondary Node Addition Procedure
X2 Link Management
UE Context Setup
Handover
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X2 Link Management
X2 Link Setup
ENDC_X2_SETUP_REQUEST_RECEIVED: Incremented when X2AP EN‐
DC X2 Setup Request is received by gNB.
ENDC_X2_SETUP_RESPONSE_SENT: Incremented when X2AP EN‐DC
X2 Setup Response is sent by gNB.
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X2 Link Management
X2 EN-DC Configuration Update (success)
X2_ENDC_CONF_UPDATE_SENT: Incremented when
X2AP EN-DC Configuration Update is sent by gNB.
X2_ENDC_CONF_UPDATE_ACK_RCVD: Incremented when
X2AP EN-DC Configuration Update Acknowledge is
received by gNB.
The purpose of the EN-DC Configuration Update procedure is to update application level configuration data needed for eNB and en-gNB to
interoperate correctly over the X2 interface. The EN-DC Configuration Update procedure allows the update of the X2-link configuration
data without restart of the X2-link.
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X2 Link Management
X2 Link Setup Failures
No EN‐DC X2 SETUP request initiated by LTE eNB
ENDC_X2_SETUP_REQUEST_NOT_RCVD: Incremented when X2AP EN‐DC X2 Setup
Request is not received after enDcX2SetupReqTmr timer expiry
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X2 Link Management
X2 Link Setup Failures with Causes
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•
ENDC_X2_SETUP_FAIL_NOSUP: Number of unsuccessful EN‐DC X2 SETUP procedure (source not supported).
Corresponding to the failure cases: the initiating Node Type is not an eNB, the initiating Node Type is an eNB,
but the Global eNB ID received from initiating LTE eNB is not of type ‘Macro eNB’
•
ENDC_X2_SETUP_FAIL_MAX_X2: Number of unsuccessful EN‐DC X2 SETUP procedure (max already reached)
•
ENDC_X2_SETUP_FAIL_PROCESSING: Number of unsuccessful EN‐DC X2 SETUP procedure (processing)
corresponding to the failure case: max number of ongoing X2 Setup request attempts
•
ENDC_X2_SETUP_FAIL_NOCELL: Number of unsuccessful EN‐DC X2 SETUP procedure (cell not available)
Corresponding to the failure case: no Served cell to include in EN‐DC X2 Setup Response
•
ENDC_X2_SETUP_FAIL_LOCKED: Number of unsuccessful EN‐DC X2 SETUP procedure (locked) Corresponding to
the failure case: LTEENB object corresponding to the LTE eNB is locked
X2 Link Management
Incoming X2 Link Reset
X2_RESET_REQUEST_RECEIVED: Incremented when X2AP Reset
Request is received by gNB.
X2_RESET_RESPONSE_SENT: Incremented when X2AP Reset Response
is sent by gNB.
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X2 Link Management
Outgoing X2 Reset
(1)
(2)
(3)
(4)
(5)
(6)
(7)
(8)
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5G‐CP‐NB receives an information that the
X2‐C link is locked by the operator
5G‐CP‐NB forwards the information to 5G‐
CP‐IF.
5G‐CP‐IF acknowledges the request from
5G‐CP‐NB
5G‐CP‐NB acknowledges the modification of
LTEEB object
5G‐CP‐IF will send REST Requet to LTE eNB
and starts x2ReseRsp Tmr timer
5G‐CP‐IF receives RESET Response from LTE
eNB over the single SCTP stream used for
X2 non‐UE associated signalling.
5G‐CP‐IF asks 5G‐CP‐NB to update LTEENB
instance with X2‐C link state to
“unavailable”.
5G‐CP‐IF stops x2ResetRspTmr timer and
requests to shutdown the SCTP association.
X2 Link Management
X2 Link Partial Reset (due to cell deletion)
1). gNB-DU warns gNB-CU a cell is deleted.
2). gNB-CU sends an X2 PARTIAL RESET Required to the
MeNB and starts timer X2PartialResetRspTmr
3). For each UE to release, the resources for these UEs
are released
4). When X2 PARTIAL RESET Confirm is received (gNB-CU
stops timer X2PartialResetRspTmr)
User context and bearer context (SN-terminated split
bearer) are removed for the 5G NSA UEs sent in the
PARTIAL RESET Required message.
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X2 Link Management
Link Shutdown
When gNB‐CU replies to MeNB with an EN‐DC X2 SETUP failure or when there is no EN‐DC X2 Setup procedure triggered by LTE (expiry of the waiting
timer for EN‐DC X2 setup procedure), a waiting timer for SCTP link shutdown due to no traffic is started.
After expiry of the waiting timer for SCTP link shutdown due to no traffic (no X2 message was received from LTE eNB), gNB‐CU asks to shutdown the
SCTP association
X2_SHUTDOWN_NO_TRAFFIC: Incremented when no more traffic on X2 link after shutdownNoX2TrafficTmr timer expiry
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Index
Secondary Node Addition Procedure
X2 Link Management
UE Context Setup
Handover
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UE Context Setup
Overview
5G-CP-RT shall perform QCI Validation.
5G-CP-RT shall perform IP Address version
validation.
5G-CP-RT shall retrieve the QCI from EUTRAN QoS IE.
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UE Context Setup
UE Context Setup Failures
Cell level: NF1CC_UECTXT_STP_QCINOTSUPP
Incremented when F1AP: UE CONTEXT SETUP
FAILURE is received with causes associated with QCI
related failures
Cell level: NF1CC_UECTXT_STP_IPNOTSUPP
Incremented when F1AP: UE CONTEXT SETUP
FAILURE is received with Cause: Transport Resource
unavailable
Cell level: NF1CC_UECTXT_STP_FAILMISC
Incremented when F1AP: UE CONTEXT
MODIFICATION REQUIRED with Cause: RLC Failure
is received in gNB‐CU
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UE Context Setup
Bearer Setup Failures
NX2CC_BEARER_FAIL_TYP_NOT_SUPP: Incremented when
X2AP: SGNB ADDITION REQUEST REJECT is sent for bearer type
mismatch.
NX2CC_BEARER_FAIL_SEC_NOT_SUPP: Incremented when
X2AP: SGNB ADDITION REQUEST REJECT is sent with causes
associated with QCI related failures ‐ 3x bearer not allowed,
QoS profile not configured
NX2CC_BEARER_FAIL_QCI_NOT_SUPP: Incremented when
X2AP: SGNB ADDITION REQUEST REJECT is sent with causes
associated with QCI related failures ‐ 3x bearer not allowed,
QoS profile not configured
NX2CC_BEARER_FAIL_IP_NOT_SUPP: Incremented when
X2AP: SGNB ADDITION REQUEST REJECT is sent with causes
associated with IP version mismatch
NX2CC_BEARER_FAIL_MISC: Incremented when X2AP: SGNB
ADDITION REQUEST REJECT is sent with any other cause than
Bearer Type, QCI, Security algorithm mismatch or IP version
mismatch
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UE Context Setup
UE Context Release over X2
NF1CC_UECTXT_REL_CMDSENT: Number of F1AP: Ue Context
Release Command message sent from gNB‐CU
NNF1CC_UE_CTXT_REL_CMP_RECD: Number of F1AP: Ue
Context Release Complete received in gNB‐CU
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Index
Secondary Node Addition Procedure
X2 Link Management
UE Context Setup
Handover
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Hand Over
gNB intra frequency PSCell change
INT_FR_PSCEL_CHA_ATT: When X2AP: SgNB Modification
Required message is sent to MeNB with the SCG Change
Indication set as "PSCellChange"
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Hand Over
PSCell change duration
INTRA_FR_PSCEL_CH_MIN_DURAT: Duration is set to the
counter when the procedure is completed and the new
value is smaller than the current value
INTRA_FR_PSCEL_CH_MIN_DURAT: Duration is set to the
counter when the procedure is completed and the new
value is bigger than the current value
INTRA_FR_PSCEL_CH_TOT_DURAT: Duration is added to the
counter when the procedure is completed
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Hand Over
PSCell change fail
INT_FR_PSCEL_CHA_FAIL_TDC_EXP: When the
TDCoverall timer has elapsed before gNB receives
the X2AP: SgNB Modification Confirm message
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Hand Over
SgNB Modification Refuse
INT_FR_PSCEL_CHA_FAIL_MENB_REF: When
MeNB replies to X2AP: SgNB Modification
Required message with the X2AP: SgNB
Modification Refuse message
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Hand Over
PSCell change failure due to resource issue
INT_FR_PSCEL_CHA_FAIL_RES_ALLO: This counter indicates the number of intra gNB intra frequency
PSCell change failures due to target cell resource allocation failure
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Hand Over
Latency counters for PSCell change
5G-CP-UE shall update the latency counter
"INTRA_FR_PSCEL_CH_TOT_DURAT" for all executed PSCell changes.
5G-CP-UE shall update the latency counters
"INTRA_FR_PSCEL_CH_MIN_DURAT" and
"INTRA_FR_PSCEL_CH_MAX_DURAT" for executed PSCell change when
their criteria are met.
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LTE Hand Over
Intra MeNB HO w/o en-gNB change
5G-CP-UE shall read the Information coming
inside X2AP: SgNB Modification Request Message,
5G-CP-UE shall update counter
SGNB_MOD_REQ_RECEIVED for incoming X2AP:
SGNB MODIFICATION REQUEST, Incremented
upon receipt of SGNB MODIFICATION REQUEST
from LTE eNB.
5G-CP-UE shall include following IE inside X2AP:
SGNB MODIFICATION REQUEST ACKNOWLEDGE.
X2_SGNB_MOD_REQ_ACK_SENT for outgoing
X2AP: SGNB MODIFICATION REQUEST
ACKNOWLEDGE.
Incremented after sending SGNB MODIFICATION
REQUEST ACKNOWLEDGE to LTE eNB.
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LTE Hand Over
sgNB Modification Reject
If Admission fails due to no response from
5G-CP-CELL and
gNB_CU_InternalMessagingTimer expires.
5G-CP-UE shall send the X2AP: SgNB
Modification Request Reject message with
Cause IE as "No Radio Resources Available".
5G-CP-UE shall increment the counter
X2_SGNB_MOD_FAIL_NO_RADIO_RES.
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