Downlink user allocations (LTE-Advanced)
You can have the demodulator autodetect allocations by modulation type or by decoding PDCCH Physical Downlink Control Channel, or you can define user mappings manually.
- Configure decoded PDCCH autodetection
- Configure power-based autodetection
- Configure user allocations manually
You can interact with the allocations in the
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.When Auto-detect Power Levels selected, the Edit User Mapping... button will be disabled.
For downlink signals, auto detection does not support Transmission Mode 9 beamforming.
To set parameters for Decoded PDCCH RB autodetection:
-
Select
-
Set RB Auto Detect Mode to
-
Configure codeword power detection
Select Auto-detect Power Levels
-or-
Clear CW0 Power and CW1 Power for each user in the LTE Long Term Evolution Allocation Editor. Alternately, you can select Use Per-antenna EPRE and specify the EPRE parameter. Then click to save changes and close the LTE Allocation Editor. Then click to save changes and close the LTE Allocation Editor.
and specify
To set parameters for power-based RB autodetection:
- Select RB Auto Detect
-
Open the LTE Allocation Editor
Click
- Set RB Auto Detect Mode to
-
Configure codeword power detection
Select Auto-detect Power Levels
-or-
Clear CW0 Power and CW1 Power). Alternately, you can select Use Per-antenna EPRE and specify the EPRE parameter. Then click to save changes and close the LTE Allocation Editor.
, and then specify codeword powers ( -
Select the codewords to include in analysis by selecting the check boxes to the left of
and . -
Set MIMO Multiple Input, Multiple Output: A physical layer (PHY) configuration in which both transmitter and receiver use multiple antennas. parameters for multiple-antenna signals. These parameters apply to all autodetected modulation groups (QPSK Quadrature phase shift keying, 16QAM, 64QAM, or 256QAM--available only when Enable Higher Order Modulation is selected).
-
Select Precoding type to detect
-
Specify No. Layers
-
Specify No. Codewords
-
Specify Codebook Idx
-
Specify CDD
-
- Click to save changes and close the LTE Allocation Editor.
To define user mappings manually:
-
Open the LTE Allocation Editor
Click
- Clear RB Auto Detect
-
Configure multi-frame analysis (optional)
For single-antenna TDD Time Division Duplex: A duplexing technique dividing a radio channel in time to allow downlink operation during part of the frame period and uplink operation in the remainder of the frame period. signals, you can define allocations for two different frames. To configure the demodulator for multi-frame analysis:
-
Make sure configuration
is set to a single-channel - Select Multi-Frame Analysis
-
Set the frame to show on the Show Mapping parameter
graph in the lower section of the using the
-
-
Add a user
-
Click the
button next to the list of users -
Configure User-specific Reference Signal settings
-
Set RNTI
- Select UE-specific RS Present
- Select UE-specific RS Include
- Specify UE-specific RS Power (dB)
- Specify UE User Equipment (e.g. cell phone)-specific RS Port and nSCID
-
-
-
Set the MIMO parameters for the user
-
Select Precoding type for this user
- Specify No. Layers
- Specify No. Codewords
- Specify Codebook Idx
- Specify CDD
-
- Configure user resource block allocations
- Select the codewords to include in analysis by selecting the check boxes to the left of and .
Add a resource block allocation for each rectangular section of the frame that the user has been assigned by clicking the
button next to the slot allocations.Set the resource block and slot boundaries for each allocation (RB Start, RB End, Slot Start, and Slot End).
Set the codewords' modulation types (CW0 Mod Type and CW1 Mod Type).
Set codeword powers (CW0 Power and CW1 Power)
or
Select Use Per-antenna EPRE and specify the EPRE parameter.
(TDD only, single antenna) When performing multi-frame analysis, specify which frame contains the allocation using the Frame Index parameter.
When a parameter is different for each allocation, clear the check box to the right of the parameter, and set the parameter for each allocation separately.
-
Repeat steps 4-6 to add more users
-
Click
to save changes and close the .
For more information about the parameters, see LTE Allocation Editor.
See Also