Open topic with navigation

Downlink (Advanced LTE TDD)

Click the Predefined Configuration button to access a dialog box from which you can select a base channel configuration.

To set up a fixed reference channel (FRC), click the Wizard button to open the DL FRC Wizard.

Click the links in the tables below for parameter descriptions.

1. Cell Parameters

State

Choice: On | Off

Default: On

Double-click or use the drop-down menu to turn the downlink transmission off or on.

Antenna Port

Choice: 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7

Default: 0

In multi-antenna configurations, specify the antenna to be used for transmitting the downlink signal. The available selections are determined by the Total Number of Antennas setting.

Total number of Antennas

Choice: 1 Antenna | 2 Antennas | 4 Antennas | 8 Antennas

Default: 1 Antenna

In multi-antenna configurations, specify the total number of antennas used for downlink transmission.

For multiple signal generator configurations, set the Channel State parameter in the Fading section of the Carrier node to On to make this cell active. When the channel state is off, you must change the number of signal generators (for example, Quick Setup Mx1, Mx2, Mx4) to change the number of BS antennas.

Power Definition Type

Choice: Total Power | RSTP

Default: Total Power

Double-click or use the drop-down menu to select the power definition type.

If Total Power is selected, power reference is Amplitude parameter on Instrument node. In this case, RSTP and OSTP are automatically calculated by Amplitude parameter on Instrument node, Power parameter on Carrier node and each carrier signal settings.

If RSTP is selected, power reference is RSTP. In this case, Amplitude on Instrument node and OSTP are calculated by RSTP, Power parameter on Carrier node and each carrier signal settings.

In multiple carrier case, Power Definition Type parameter in each carrier should be same.

Reference Signal Transmit Power (RSTP)

Range: -15.00 to -144.00 dBm

Default: -34.77 dBm

Enter the Reference Signal Transmit Power in dBm, when the Power Definition Type is RSTP. Otherwise displays the Reference Signal Transmit Power in dBm and the value is updated after generation.

See 3GPP TS 36.141 for more information.

OFDM Symbol Transmit Power (OSTP)

Display the Downlink OFDM Symbol Transmit Power in dBm. This parameter is set by the software.

For detailed information about OSTP, refer to 3GPP TS 36.141.

2. Cell Specific Reference Signal

Cell specific Reference Signal Power

Range: -60 to 20 dB

Default: 0 dB

Enter a power level in dB for the cell specific reference signal.

Cell specific Reference Signal Frequency Shift

The software maps cell specific reference signal symbols to resource elements in compliance with 3GPP technical specification TS 36.211. The Cell specific Reference Signal Frequency Shift parameter is set by the software to control the reference signal offset in each subframe.

The applied frequency offsets are indicated in the resource mapping graph.

For detailed information about reference symbol mapping, refer to 3GPP TS 36.211 at http://www.3gpp.org. 

PDSCH Cell Specific Ratio

Choice: pB/pA=1 | P_B=0 | P_B=1 | P_B=2 | P_B=3

Default: pB/pA=1

Double-click or use the drop-down menu to select the PDSCH cell specific ratio.

3. Positioning Reference Signals (PRS)

PRS Overview

• PRSs are transmitted on antenna port 6.

• PRSs apply for a only.

• The positioning reference signals are not mapped to the resource elements allocated to Physical Broadcast Channels (PBCH), the Primary Synchronization Signals (P-SS) or the Secondary Synchronization Signals (S-SS) regardless of their antenna port p.

• A UE may assume that PRSs are not present in the resource blocks in which it decodes the PDSCH according to a detected PDCCH with the CRC scrambled by the SI-RNTI or a P-RNTI with DCI format 1A or 1C that is intended for the UE.

• PRSs are not transmitted in special frames.

• PRS is transmitted in N_PRS consecutive downlink frames, where N_PRS is configured by the higher layers.

• PRSs are not used for transmission of PBCH, synchronization signals, cell-specific reference signals, Multimedia Broadcast Single Frequency Network (MBSFN) reference signals or UE-specific reference signals.

• For Release 9, CSI-RS is not supported; there is no conflict between CSI-RS and PRS.

State

Choice: Off | On

Default: Off

Double-click or use the drop-down menu to enable or disable the channel. See 3GPP TS 36.211.

Power

Range: -60.000 to 20.000 dB

Default: 0.000 dB

Enter a power level in dB for the selected channel. See Output Power Calculation (Downlink) for a description of how the software applies your power setting. See 3GPP TS 36.211.

Antenna Mapping for Port 6

Range: 0 or 1 as comma separated values (CSV), equal to the number of antennas selected.

Default: 1

Enter 0 or 1 separated by commas to assign the positioning reference signals (PRS) to the physical antennas. The comma separate length is up to the Total Number of Antennas. 0 and 1 mean Off and On respectively. Comma separate sequence order means physical antenna port number.

Example: Total Number of Antennas = 4 Antennas and Antenna Mapping = [1, 1, 1, 1] case, PRS is assigned to all antennas (port 0 to 3). See 3GPP TS 36.211.

Number of PDCCH Symbols

Range: 1 to 3 (N_DL_RB > 10), 2 or 3 (N_DL_RB <= 10)

Default: 2

Enter the number of PDCCH symbols for all of the positioning reference signal (PRS) subframes.

This parameter defines the number of PDCCH OFDM symbols for all of the PRS subframes. The PRS subframes are assigned by the Number of Consecutive DL Frames (N_PRS), PRS Configuration Index (I_PRS), PRS Periodicity (T_PRS), and PRS Subframe Offset (Delta_PRS).

If the PRS State = on and PRS subframe is assigned, corresponding subframe of PDCCH Allocations parameters in DCI are changed by the Number of PDCCH Symbols.

• Where: N_DL_RB <= 10, the Number of PDCCH Symbols allowed is 2 or 3.

• Where: N_DL_RB > 10, the Number of PDCCH Symbols allowed is 1 to 3.

Refer 3GPP TS 36.211 and 36.331.

PRS Bandwidth

Choice: 1.4 MHz (6RB) | 3 MHz (15RB) | 5 MHz (25RB) | 10 MHz (50RB) | 15 MHz (75RB) |20 MHz (100RB)

Default: 5 MHz (25RB)

Specifies the bandwidth (resource block size) that is used to configure the positioning reference signals (PRS).

Available setting value is up to the System Bandwidth. If the System Bandwidth was set to less than the PRS Bandwidth, the PRS Bandwidth is automatically set the same as the System Bandwidth.

Refer 3GPP TS 36.211 and 36.355.

Number of Consecutive DL Frames (N_PRS)

Choice: 1 subframe | 2 subframes | 4 subframes | 6 subframes

Default: 1 subframe

Specifies the number of consecutive downlink subframes N_PRS with positioning reference signals (PRS).

This is time accumulation for accuracy improvement to configure consecutive PRS.

There is parameter coupling among the Uplink/Downlink Configurations, the Number of Consecutive DL Subframes (N_PRS) and the PRS Configuration Index (I_PRS). The choice/range of the Number of Consecutive DL Subframes (N_PRS) and the PRS Configuration Index (I_PRS) are limited by the Uplink/Downlink Configurations. This means the settings are not allowed PRS in a specific subframe and uplink subframe.

Refer 3GPP TS 36.211.

PRS Configuration Index (I_PRS)

Range: 0 to 2399

Default: 0

Enter PRS Configuration Index for the Positioning Reference Signals (PRS).

This automatically defines both PRS Periodicity and PRS Subframe Offset.

The first Subframe of the N_PRS downlink subframes shall satisfy:

Where: Wave Generation Length < (PRS Subframe Offset + Number of Consecutive DL Frames), a part of or all of PRSs are not available for the current waveform.

There is parameter coupling among the Uplink/Downlink Configuration, the Number of Consecutive DL Subframes (N_PRS) and the PRS Configuration Index (I_PRS). The choice/range of the Number of Consecutive DL Subframes (N_PRS) and the PRS Configuration Index (I_PRS) are limited by the Uplink Downlink Configuration. This means the settings do not allow PRS in a specific subframe and uplink subframe.

Refer 3GPP TS 36.211.

PRS Periodicity (T_PRS)

Choice: 160 (subframes) | 320 (subframes) | 640 (subframes) | 1280 (subframes)

Default: 160 (subframes)

This is a read-only parameter automatically decided by PRS Configuration (I_PRS) as follows:

The first subframe of N_PRS downlink subframes shall satisfy (10 * SFN + Floor(Slot# / 2) - Delta_PRS) mod T_PRS = 0.

• I_PRS = 0 to 159 case, T_PRS = 160 (subframes).

• I_PRS = 160 to 479 case, T_PRS = 320 (subframes).

• I_PRS = 480 to 1119 case, T_PRS = 640 (subframes).

• I_PRS = 1120 to 2399 case, T_PRS = 1280 (subframes).

Where: Wave Generation Length < (PRS Subframe Offset + Number of Consecutive DL Frames), a part of or all of PRSs are not available for the current waveform.

Refer 3GPP TS 36.211.

PRS Subframe Offset (Delta_PRS)

Range: 0 to 1280 (subframes)

Default: 0 (subframe)

This is read only parameter automatically decided by PRS Configuration (I_PRS) as follows.

The first subframe of the N_PRS downlink subframes shall satisfy (10 * SFN + Floor(Slot# / 2) - Delta_PRS) mod T_PRS = 0.

• I_PRS = 0 to 159 case, Delta_PRS = I_PRS

• I_PRS = 160 to 479 case, Delta_PRS = I_PRS - 160

• I_PRS = 480 to 1119 case, Delta_PRS = I_PRS - 480

• I_PRS = 1120 to 2399 case, Delta_PRS = I_PRS - 1120

Where: Wave Generation Length < (PRS Subframe Offset + Number of Consecutive DL Frames), a part of or all of PRSs are not available for the current waveform.

For more detail, refer 3GPP TS 36.211.

PRS Muting Sequence Length

Choice: 2 | 4 | 8 | 16

Default: 2

Specifies the bit length of PRS Muting Sequence parameter.

PRS Muting Sequence

Range: 0 or 1 with comma separate input

Length: PRS Muting Sequence Length

Default: 1,1

Specifies PRS Muting Sequence. The value '0' means muting and '1' means not muting in the sequence.

The sequence length is defined by PRS Muting Sequence Length parameter.

If a bit in the PRS muting sequence is set to '0', the PRS is muted in the corresponding PRS positioning occasion. A PRS positioning occasion comprises of N_PRS downlink positioning subframes. The first bit of the PRS muting sequence corresponds to the first PRS positioning occasion.

Refer 3GPP TS 36.355.

4. Synchronization Signals

Primary Synch Signal State

Choice: Off | On

Default: On

Double-click or use the drop-down menu to turn the primary synchronization signal (P-SS) On or Off.

Primary Synch Signal Power

Range: -60 to 20 dB

Default: 0.00 dB

Enter the power level in dB for the primary synchronization signal, relative to the average subcarrier power.

Secondary Synch Signal State

Choice: Off | On

Default: On

Double-click or use the drop-down menu to turn the secondary synchronization signal (S-SS) On or Off.

Secondary Synch Signal Power

Range: -60 to 20 dB

Default: 0.00 dB

Enter the power level in dB for the secondary synchronization signal.

P-SS/S-SS Transmit Antenna Port

Choice: Port 0 | Port 1 | Port 2 | Port 3 | All Ports

Default: Port 0

Double-click or use the drop-down menu to select the P-SS/S-SS Transmit Antenna Port type.