X2-AP

The X2-AP interface provides control interface to EnodeB SUT from the Landslide emulated ENodeB.

The X2-AP tab is available in MME Nodal Test Case when Test Activity is Intra-MME Mobility, Handoff Type is X2, and you select X2 Interface on the MME Nodal Test Configuration tab.

The X2-AP tab is available in gNB CU NSA Nodal and gNB CU Node Test Cases.

Version (36.423)
Startup Time (ms)
Setup Time (ms)
Response Time (ms)
EUTRA Mode Type

Send X2 Reset After X2 Connected
Reset

FDD
Uplink EARFCN
Downlink EARFCN
Uplink Transmission Bandwidth
Downlink Transmission Bandwidth

TDD
EARFCN
Transmission Bandwidth
Subframe Assignment
Special Subframe Patterns
Downlink Cyclic Prefix
Uplink Cyclic Prefix

X2 Handover Settings

Relocation Preparation Time (ms)
Relocation Overall Time (ms)

Related Measurements

Measurements collected for X2-AP session related processing are reported on the X2-AP Session measurement tab.

Version

Select the proprietary version of the application from the dropdown list.

Available for selection in gNB CU NSA Nodal Test Case and gNB CU Node test Cases.

Options: 11.2.0/Sep2012 , 15.3.0/Sep2018, 15.7.0/Oct2019 (5G test cases)

Default: 11.2.0/Sep2012 , 15.3.0/Sep2018 (5G test cases)

Tcl Parameters: X2apVersion

Startup Time (ms)

This defines the period of time taken to wait before establishing the SCTP Transport Layer.

Available for selection in gNB CU NSA Nodal Test Case.

Range : 1000 to 60000

Default : 2000

Tcl Parameters: X2apStartupTime

Setup Time (ms)

This defines the period of to wait before sending the X2 Setup Message.

Available for selection in gNB CU NSA Nodal Test Case.

Range : 1000 to 20000

Default : 2000

Tcl Parameters: X2apSetupTime

Response Time (ms)

Indicates the length of time the Landslide waits for a response to an X2AP request message.

Available for selection in gNB CU NSA Nodal Test Case.

Range : 1000 to 60000

Default : 5000

NOTE: An X2 AP request message will not be resent when the X2AP Response Timer expires.

Tcl Parameters: X2apResponseTime

EUTRA Mode Type

Select the EUTRA mode type.

Options are Frequency Division Duplex (FDD) or Time Division Duplex (TDD). In FDD mode, both uplink and downlink can transmit at the same time at different spectrum frequencies. In TDD, both uplink and downlink use the same spectrum frequencies but at different times.

Per Spec 36.423.

Available in gNB CU NSA Nodal test case.

Options : TDD or FDD

Tcl Parameters: X2apEutraModeType

FDD - Frequency Division Duplex

The FDD Pane becomes available for input when EUTRA Mode Type = FDD. Available in gNB CU NSA Nodal test case.

Uplink EARFCN	Enter the uplink for EUTRA Absolute Radio-Frequency Channel Number (ARFCN). An EARFCN defines a pair of Radio Frequency (RF) channel frequencies for uplink and downlink use. Range : 0 to 262143 Default: 0 Tcl Parameter: X2apFddUlEarfcn
Downlink EARFCN	Enter the downlink for EUTRA Absolute Radio-Frequency Channel Number (ARFCN). An ARFCN defines a pair of Radio Frequency (RF) channel frequencies for uplink and downlink use. Range : 0 to 262143 Default: 0 Tcl Parameter: X2apFddDlEarfcn
Uplink Transmission Bandwidth	Select the uplink transmission bandwidth. Options : bw6 , bw15 , bw25 , bw50, bw75 , bw100, bw1 Default: bw6 Tcl Parameter: X2apFddUlXmitBw
Downlink Transmission Bandwidth	Select the downlink transmission bandwidth. Options : bw6 , bw15 , bw25 , bw50, bw75 , bw100, bw1 Default: bw6 Tcl Parameter: X2apFddDlXmitBw

TDD Time Division Duplex

The TDD Pane becomes available for input when EUTA Mode Type = TDD. Available in gNB CU NSA Nodal test case.

EARFCN	Enter the EUTRA Absolute Radio-Frequency Channel Number (ARFCN). An EARFCN defines a pair of Radio Frequency (RF) channel frequencies for uplink and downlink use. Range : 0 to 65535 Default: 0 Tcl Parameter: X2apTddEarfcn
Transmission Bandwidth	Select the transmission bandwidth. Options : bw6 , bw15 , bw25 , bw50, bw75 , bw100, bw1 Default: bw6 Tcl Parameter: X2apTddXmitBw
Subframe Assignment	Select the Subframe Assignment. Options : sa0, sa1, sa2, sa3, sa4, sa5, sa6 Default: sa0 Tcl Parameter: X2apTddSfAssign
Special Subframe Patterns	Select the Special Subframe Patterns. Options : ssp0, ssp1, ssp2, ssp3, ssp4, ssp5, ssp6, ssp7, ssp8 Default: ssp0 Tcl Parameter: X2apTddSfPattern
Downlink Cyclic Prefix	Select the downlink cyclic prefix. Options : Normal, Extended Default: Normal Tcl Parameter: X2apTddDlCycPrefix
Uplink Cyclic Prefix	Select the uplink cyclic prefix. Options : Normal, Extended Default: Normal Tcl Parameter: X2apTddUlCycPrefix

Send X2 Reset After X2 Connected

Select to send X2 Reset only after X2 link is established in MME Nodal test case.

The reset messages are exchanged between the emulated eNodeB and eNodeB (SUT).

NOTE:

The reset message is sent (from eNodeB SUT to emulated eNodeB) in case of a failure resulting in the loss of some or all transaction reference information.
When a reset messaged is received (by the emulated eNodeB), all allocated resources on X2 related to the UE Contexts(s) indicated in the reset message are released and the all UE Contexts/associations are removed.

Type: True/False

Default: False

Tcl Parameter: X2apSendX2ResetEn

Reset

Reset All, Partial Reset

UE to be Reset Ratio (%)

Include UE X2AP ID

Select for X2Reset in gNB CU Node TC. Available when Command Mode is Enabled.

Per Specfification : O-RAN.WG5.C.1 Section 4.1.4.4 – Partial Reset (gNB-CU initiated) for EN-DC
O-RAN.WG5.IOT.0-v06.00 Section 2.3.1.28 – Partial Reset (gNB-CU initiated) for EN-DC

Select Reset Mode and choose Reset All or Partial Reset.

When Partial Reset is selected, enter the UE to be Reset Ratio percentage.

Range : 1 to 100,

Default : 50

Select Include UE X2AP ID.

Options :

MeNB UE X2AP ID (default),

SgNB UE X2AP ID,

MeNB UE X2AP ID,

All IDs

Tcl Parameter: X2apResetModeEn

Tcl Parameter: X2apResetMode

Tcl Parameter: X2apResetPercent

Tcl Parameter: X2apResetOption

Relocation Preparation Time

Indicates the length of time/maximum time for the Handover Preparation procedure in the source eNodeB (SUT).

Range : 1000 to 600000

Default : 5000

Tcl Parameters: X2apReloPrepTime

Relocation Overall Time

Specifies the maximum time for the protection of the overall handover procedure in the source eNodeB.

Range : 1000 to 600000

Default : 5000

Tcl Parameters: X2apReloOverallTime

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