PUSCH allocations (LTE)

Menu Path: MeasSetup > LTE Demod Properties > Profile Tab > Edit User Mapping... > PUSCH tab

This topic contains a information on configuring the PUSCH Physical Uplink Shared Channel channel allocations for a user mapping. There are two sections, one for configuring PUSCH for resource block autodetection, and one for manually defining PUSCH resource block allocations.

To set up a user mapping, see the Uplink user allocations topic.

For more information about the parameters listed in the procedure below, see the LTE Allocation Editor topic.

Configuring PUSCH for resource block autodetection

  1. Select the PUSCH tab

  2. Configure frequency hopping

    1. Set frequency hopping type (Freq. Hopping)

    2. Specify whether to use Inter-SF or Intra/Inter-SF frequency hopping (Freq.HopMode)

    3. Set the frequency hopping offset (NRBHO)

    4. Set the number of frequency hopping subbands (NSB)

  3. Configure DMRS parameter auto-calculation

    1. Select Auto-calculate per-slot params

    2. Set nDMRS(1) 

    3. Set nDMRS(2) 

    4. Set Dss 

    To specify uniform DMRS parameters, clear the Auto-calculate per-slot params parameter and set DMRS Group (u), DMRS Seq (v), and DMRS Cyclic Shift per-slot parameters. These DMRS parameter will apply to all PUSCH resource block allocations found in the frame.

  4. Configure sync slot

    Skip to Step 5 if you have chosen a different signal than PUSCH DMRS for synchronization. The demodulator will ignore the sync slot parameters for channels/signals that are not selected for synchronization.

    Select Auto Sync to automatically find a sync slot in the frame.

    To specify the sync slot manually, clear Auto Sync. You will also need to set the Sync Slot index and specify the resource block allocation of the sync slot using PRB/VRB Start and PRB/VRB End.

    There must be a unique slot in the Measurement Interval for the frame boundary to be detected correctly. This unique slot can be defined for PUSCH, PUCCH Physical Uplink Control Channel, or SRS Signaling Reference Signal. The Sync Type parameter determines which channel's sync slot is used for frame boundary calculations.

  5. Configure remaining per-slot parameters

    1. Set PUSCH channel power (Power (dB))

    2. Set DMRS power (DMRS Power (dB))

  6. Return to Uplink user allocations and configure other channels and signals.

Manually defining PUSCH resource block allocations

  1. Select the PUSCH tab

  2. Add PUSCH subframe allocations

    Use the Add, Delete, Slot Up, and Slot Down buttons to add a slot allocation for each slot containing PUSCH for the currently selected user.

  3. Configure Per-slot Parameters

    These parameters are coupled across all slots by default. To set these parameters for each slot allocation individually, clear the Couple check box next to the parameter.

    1. Set resource block frequency location (PRB/VRB Start and PRB/VRB End)

      You can interact with the allocations in the RB Mapping grid below by clicking on them. Clicking selects an allocation. Dragging will reposition an allocation. And, dragging the circular handles at the corners will resize an allocation.

    2. Set modulation type (Mod. Type)

    3. Set PUSCH channel power (Power (dB))
    4. Set DMRS Power (dB)

    The remaining Per-slot Parameters are configured in the following steps.

  4. Configure frequency hopping

    1. Set frequency hopping type (Freq. Hopping)

    2. Specify whether to use Inter-SF or Intra/Inter-SF frequency hopping (Freq.HopMode)

    3. Set NRBHO

    4. Set NSB

    5. Set per-slot parameter CUR_TX_NB mod 2 when this PUSCH channel uses frequency hopping.

      Set per-slot parameter Mirroring when manually specifying physical resource blocks for frequency hopped signals.

  5. Configure Demodulation Reference Signal (DMRS) parameter auto-calculation

    1. Select Auto-calculate per-slot params

    2. Set nDMRS(1)

    3. Set nDMRS(2)

    4. Set Dss

    To specify DMRS parameters manually, clear the Auto-calculate per-slot params parameter and set DMRS Group (u), DMRS Seq (v), and DMRS Cyclic Shift per-slot parameters. These DMRS parameters will apply to all PUSCH slot allocations unless you clear the Couple check box to the left of the parameter name.

  6. Configure sync slot

    Select Auto Sync to automatically determine the sync slot. The demodulator will choose a unique slot from the slot allocations. When there is more than one unique slot defined, the demodulator will use the one with the highest correlation.

    To manually specify which slot to use as the sync slot, clear Auto Sync and set the Sync Slot index.

  7. Return to Uplink user allocations and configure other channels and signals.

See Also

Downlink user allocations

Uplink user allocations

PUCCH allocations

SRS allocations

PRACH allocations

Setting up an LTE Measurement