Downlink Configuration

There are total four downlink configurations. The associated channels and subframe layout with each downlink configuration are as below. User can add or remove multiple xPDSCH to have multi-user transmission. When resource allocation conflict occurs between channels, the channel block with conflict will display an icon on the right-top of the button and user needs to resolve it before generating the waveform.

CSI-RS

CSI reference signals are transmitted on 8 or 16 antenna ports using antenna port 16 ~ 23 or 16 ~ 31 respectively. Resource allocation conflict could occur between BRRS and CSI-RS, in this case, BRRS block will become red and user needs to resolve the conflict by disable one of these two channels.

Enabled

Select/ deselect the Enable check box to enable/ disable the channel or signal in a radio frame.

Power Boosting

Range: -40 - 40

Default: 0

Set the additional power boosting for the channel.

Pc Ratio

Range: -8 dB - 15 dB

Default: 0 dB

This is the assumed ratio of xPDSCH EPRE to CSI-RS EPRE when UE derives CSI feedback.

n_CSI_ID

Range: 0 - 65535

Default: 0

Set the n_CSI_ID for CSI-RS sequence generation.

Symbol Allocation

Choices: 00 - 13th Symbol | 01 - 14th Symbol | 10 - 13th & 14th Symbols

Default: 10 - 13th & 14th Symbols

Set the number of OFDM symbols allocated to CSI-RS.

Antenna Port

Set the antenna port on which the symbols will be generated into the waveform.

BRRS

Beam refinement reference signals are transmitted on up to eight antenna ports using antenna port 600 ~ 607.

When allocation type is Symbol, resource allocation conflict could occur between BRRS and CSI-RS, in this case, BRRS block will become red and user needs to resolve the conflict by disable one of these two channels.

When allocation type is Subframe, resource allocation conflict could occur between BRRS and xPDSCH, in this case, BRRS block will become red and user needs to resolve the conflict by disable one of these two channels.

Enabled

Select/ deselect the Enable check box to enable/ disable the channel or signal in a radio frame.

Power Boosting

Range: -40 - 40

Default: 0

Set the additional power boosting for the channel.

n_BRRS_ID

Range: 0 - 65535

Default: 0

Set the n_BRRS_ID for BRRS sequence generation.

Allocation Type

Choices: Subframe | Symbol

Default: Subframe

Set the allocation type for BRRS.

Resource Allocation

Choices: 00 - 5 Symbols in Slot 0 | 01 - 5 Symbols in Slot 1 | 10 - 10 Symbols

Default: 00 - 5 Symbols in Slot 0

Select the resource allocation for BRRS subframe allocation type.

Antenna Port

Set the antenna port on which the symbols will be generated into the waveform.

xPDCCH

The physical downlink control channel carries scheduling assignments (DCIs). A physical downlink control channel is transmitted using an aggregation of 2/4/8/16 consecutive enhanced control channel elements (CCEs). Each CCE contains 6 consecutive RBs, so max 16 CCEs in one OFDM symbol.

1.xPDCCH

Enabled

Select/ deselect the Enable check box to enable/ disable the channel or signal in a radio frame.

Power Boosting

Range: -40 - 40

Default: 0

Set the additional power boosting for the channel.

DMRS Power Boosting

Range: -40 - 40

Default: 0

Set the DMRS power relative to data part.

CCE Offset

Range: 0 - 14

Default: 0

Set the CCE offset indicating where xPDCCH starts from. It's only configurable when channel coding is Off.

Number of CCEs

Range: 2 - 16

Default: 16

Set the number of CCEs allocated to xPDCCH. It's only configurable when channel coding is Off.

N_xPDCCH_SCID

Range: 0 - 65535

Default: 2

Set the n_xPDCCH_SCID for DMRS sequence generation.

N_xPDCCH_ID

Range: 0 - 65535

Default: 0

Set the n_xPDCCH_ID for DMRS sequence generation.

Scrambling

Enable or disable the scrambling for the channel.

Transmission Mode

Choices: Single Antenna Port | Transmission Diversity | Spatial Multiplexing

Default: Single Antenna Port

Select the channel transmission mode that determines the layer number and available antenna ports.

Number of Layers

Range: 1 - 2

Default: 1

Set the number of layers for the selected transmission mode. It's only configrable in spatial multiplexing mode.

Antenna Port

Set the antenna port on which the symbols will be generated into the waveform.

2. Modulation and Coding

Channel Coding

Enable or disable transport layer channel coding. When disabled, raw payload data will be passed to scrambler directly.

When channel coding is On, DCI Transmissions will be auto generated based on the number of xPDSCH. It is a 1-1 mapping between DCI and xPDSCH using RNTI as an identifier, even xPDSCH is turned off.

When channel coding is on, user can bring up the DCI transmission configuration form to view or configure.

DCI Transmissions

Click the button to bring up the Closed DCI Transmission dialog.

Format

Select one of the following DCI formats:

B1 for downlink single antenna port or transmit diversity modes
B2 for downlink spatial multiplexing mode
A1 for uplink single antenna port or transmit diversity modes
A2 for uplink spatial multiplexing mode

When DCI is auto generated, format is set to proper value based on associated xPDSCH transmission mode. However, it allows user to change it to other values.

RNTI

This field displays the Radio network temporary ID of the associated xPDSCH.

This a a read-only field.

MCS

This field displays th Modulation and coding schemeof the associated xPDSCH or xPUSCH.

This a a read-only field.

RIV

This DCI field displays the VRBG resource indicator value and is calculated by VRBG Start and Number of VRBGs of the associated xPDSCH or xPUSCH.

This a a read-only field.

Range

This field displays the symbol range for xPDSCH or xPUSCH and is calculated by starting and ending symbols of the associated xPDSCH or xPUSCH.

This a a read-only field.

PCRS

This DCI field displays thePCRS configuration of the associated xPDSCH.

This a a read-only field.

CCE Number

Select the number of CCEs allocated to DCI,

If conflict exist in DCI resource allocation, an error message will be displayed when closing the form and ask user to resolve the conflict by changing CCE Offset or CCE Number.

CCE Number + CCE Offset%16 must be equal to or less than 16.

CCE Offset

Select the CCE offset from where DCI starts.

When 1 symbol is allocated to xPDCCH, the range of offset is 0 – 14.

When 2 symbols are allocated to xPDCCH, the rang of offset is 0 – 30 and offset 16 start from 2nd symbol.

If conflict exist in DCI resource allocation, an error message will be displayed when closing the form and ask user to resolve the conflict by changing CCE Offset or CCE Number.

Payload Mode

Select the payload mode for DCI transmission.

DCI: When you select DCI when you are using auto-generated DCI message based on parameter above.
Custom Payload: Selecting this option allows you to input their own 60-bit DCI data.

Custom Payload

Bring up the Closed Payload Editor to configure the payload bits

Custom Payload is only configurable when Payload Mode is equal Custom Payload.

Payload

Choices: PN9 | PN15 | PN23 | Custom Bit Pattern | User File

Default: PN9

Bring up the Closed Payload Editor to select the data bits used for the channel payload.

User file with Hex data is supported by having a ‘x’ at the beginning of the file, for example, x1234567890ABCDEF.

xPDSCH

1. xPDSCH

Enabled

Select/ deselect the Enable check box to enable/ disable the channel or signal in a radio frame.

RNTI

Range: 0 - 65535

Default: 0

Set the RNTI for the channel.

Power Boosting

Range: -40 - 40

Default: 0

Set the additional power boosting for the channel.

DMRS Power Boosting

Range: -40 - 40

Default: 0

Set the DMRS power relative to data part.

PCRS Power Boosting

Range: -40 - 40

Default: 0

Set the PCRS power relative to data part.

VRBG Start

Range: 0 - 24

Default: 0

Set the start index of VRBG assigned to the channel. When a resource allocation conflict occurs, the channel block color will become red. User needs to resolve this conflict before generating the signal.

Number of VRBGs

Range: 1 - 25

Default: 25

Set the number of VRBGs assigned to the channel. It will be automatically updated when VRBG Start + Number exceeds the max VRBG number of 25. When a resource allocation conflict occurs, the channel block color will become red. User needs to resolve this conflict before generating the signal.

Symbol Start

Display the start index of OFDM symbols assigned to the channel. It's determined by the subframe configuration.

Symbol Stop

Display the index of last OFDM symbol assigned to the channel. It's determined by the subframe configuration.

HighSpeed

Enable or disable high speed case, which will add an addition DMRS at symbol 10.

n_SCID

Range: 0 - 65535

Default: 0

Set the n_SCID for DMRS sequence generation.

n_ID (DRMS)

Range: 0 - 65535

Default: 0

Set the n_ID for DMRS sequence generation.

n_ID (PCRS)

Range: 0 - 65535

Default: 0

Set the n_ID for PCRS sequence generation.

Scrambling

Enable or disable the scrambling for the channel.

Transmission Mode

Choices: Single Antenna Port | Transmission Diversity | Spatial Multiplexing

Default: Single Antenna Port

Select the channel transmission mode that determines the layer number and available antenna ports.

Number of Layers

Range: 1 - 2

Default: 1

Set the number of layers for the selected transmission mode. It's only configrable in spatial multiplexing mode.

OCC

Enable or disable OCC for selected transmission mode.

Antenna Port

Set the antenna port on which the symbols will be generated into the waveform.

PCRS Configuration

Choices: 00 - No PCRS | 01 - PCRS on AP 60 | 10 - PCRS on AP 61 | 11 - PCRS on AP 60 & 61

Default: 00 - No PCRS

Select the PCRS configuration of the channel.

2. Modulation and Coding

Channel Coding

Enable or disable transport layer channel coding. When disabled, raw payload data will be passed to scrambler directly.

MCS

Range: 0 - 14

Default: 0

Set MCS index for the channel.

Set MCS to -1 to get 256QAM modulation when channel coding is off.

Modulation

Choices: QPSK | 16QAM | 64QAM

Default: QPSK

Display the modulation type of the channel. It's automatically updated by MCS index change.

Transport Block Size

Display the transport block size of the channel. It's automatically updated by MCS index change.

Payload

Choices: PN9 | PN15 | PN23 | Custom Bit Pattern | User File

Default: PN9

Bring up the Closed Payload Editor to select the data bits used for the channel payload.

User file with Hex data is supported by having a ‘x’ at the beginning of the file, for example, x1234567890ABCDEF.

Number of CRC Error Subframes

Choices: 0 - Half of the number of Assigned subframes

Default: 0

Enter the number of subframes whose CRC value will have 1 bit error randomly. When this parameter is changed, the CRC Error Subframe Index will be re-generated randomly.

CRC Error Subframe Index

Default: N/A

Enter the subframe index whose CRC value will have 1 bit error randomly. When this parameter is changed, the number of CRC Error subframes will be coupled automatically.

Add

Click the Add button to add multiple xPDSCH to have multi-user transmission.

Delete

Click the Delete button to delete a xPDSCH from the multi-user transmission.