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

The LTE Allocation Editor dialog is used to define user mappings. There are two different versions of this dialog for both uplink and downlink depending on the RB Auto Detect setting. When RB Auto Detect is selected, the LTE Allocation Editor will only show the parameters needed for successful demodulation.

The lower area of the LTE Allocation Editor shows a graphical representation of the user allocations. You can use this graph to edit the allocations when defining allocations manually. Clicking on an allocation will make the allocation active. Allocations can be moved around by dragging them, and they can also be resized by dragging the circular handles at the corners.

For TDDTime 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., subframes that do not belong to the current direction are annotated by either 'ULUp Link (reverse link: from cell phone to base station)' (when direction is set to downlink) or 'DLDown Link (forward link: from base station to cell phone)' (when direction is set to uplink).

As Figure A.11 shows, the symbols are identical as regards cyclic prefixes in 4G LTE and 5G (n = 0). In fact, the only significant difference is the use of the term ‘slot’. You might recall that 4G LTE allows for an extended cyclic prefix with a length of 16.6 s for environments where the radio signal is subject to an unusually long delay. For TDD, P-SS is present in the third symbol in slots 2 and 12 in every frame. S-SS is present in the last symbol of slots 1 and 11 in every frame. The middle 72 subcarriers in these symbols are reserved for P-SS and S-SS, but only the center 62 subcarriers are used so that sync signals are more recognizable (easier to cross correlate). Each subframe in the LTE frame structure can be further split into two slots equal in length, which is T slot= 0:5ms. Within each slot, there are several OFDM symbols and cyclic pre xes. The slots in one LTE radio frame are numbered from 0 to 19.

When overlapping user allocations are defined, an overlapped area will belong to the last user listed in the Composite Include list whose allocation includes that area.

Although the LTE Allocation Editor allows downlink resource block allocations to contain uplink resource blocks in TDD frames, the demodulator will only analyze the part of the allocation that consists of downlink resource blocks and will ignore the part of the allocation that consists of uplink resource blocks.

Downlink

This table lists all the parameters available to set up downlink PDSCHPhysical Downlink Shared Channel user allocations.

Downlink LTE Allocation Editor Parameters
Parameter	Description
RBResource Block Auto Detect	When RB Auto Detect is selected, the demodulator will autodetect PDSCH user allocations according to the specified RB Auto Detect Mode. See the Downlink user allocations topic for more information about configuring parameters for user allocation autodetection. When RB Auto Detect Mode is set to Power Based, the LTELong Term Evolution demodulator can detect allocations which use either Spatial Multiplexing (SpMux) or Transmit Diversity (TxDiv) precoding, but not both. The Precoding parameter determines which type of precoding the demodulator looks for. For downlink signals, auto detection supports only PDSCH allocations transmitted on C-RSCell-specific RS antenna ports.
RB Auto Detect Mode	RB Auto Detect Mode specifies how the LTE demodulator detects user allocations. See the RB Auto Detect Mode topic for more information.
Auto-detect Power Levels	When Auto-detect Power Levels is selected, the LTE demodulator will detect the relative PDSCH power level for each user allocation (P_A). See the Auto-detect Power Levels topic for more information.
Use Per-antenna EPRE	When selected, PDSCH power is specified by the EPRE (Energy Per Resource Element) parameter. When cleared, PDSCH power is specified using the CW0/CW1 Codeword Power parameters.
Multi-Frame Analysis (single-antenna, TDD only)	Specifies whether to allow multi-frame allocations. When this parameter is selected, allocations spanning two frames can be defined, and the Show Mapping parameter will be enabled. This parameter is only applicable to single-antenna TDD frame type 2 signals (Input > Channels set to 1 Channel or Single I+jQ; Num of C-RS Ports set to 1).
Show Mapping (single-antenna, TDD only)	Specifies which frame's allocations to show on the RB Mapping graph in the lower section of the LTE Allocation Editor. Each PDSCH allocation can be specified to be either a Frame0 or Frame1 allocation. This parameter is only applicable to single-antenna TDD frame type 2 signals (Input > Channels set to 1 Channel or Single I+jQ; Num of C-RS Ports set to 1).
Include	When this check box is selected, demodulation results from the corresponding user mapping are shown on the appropriate traces and included in EVMError vector magnitude (EVM): A quality metric in digital communication systems. See the EVM metric in the Error Summary Table topic in each demodulator for more information on how EVM is calculated for that modulation format. calculations. When this check box is cleared, demodulation results for the corresponding user mapping will only be shown on the Frame Summary table.
Name	Name of the user allocation in the form UserXX, where XX is a number.
RNTIRadio Network Temporary Identifier	Radio Network Temporary Identifier for this user. This value is used for demodulating UEUser Equipment (e.g. cell phone)-specific Reference Signals.
UE-specific RS
Present	Selecting Present will cause the demodulator to search for UE-specific RS. To view antenna beam patterns, see the Antenna Combined Beam Pattern trace. When Present is selected, CDD and Codebook Idx are disabled because codebook and CDDCyclic Delay Diversity (CDD): To avoid unintentional beamforming, the IEEE 802.11n draft standard uses a process known as Cyclic Delay Diversity (CDD), which basically offsets each spatial stream by a different constant, non-coherent delay. The offset considerably lowers the likelihood of correlated signals being transmitted by two or more antennas. This, in conjunction with a pseudorandom scrambler run over the transmitted data bits, ensures that the likelihood of two spatial streams correlating is very low. are only applied to C-RS based MIMOMultiple Input, Multiple Output: A physical layer (PHYPhysical Layer) configuration in which both transmitter and receiver use multiple antennas., not UE-specific RS based MIMO.
Include	When Include is selected, UE-specific RS will be shown on appropriate traces and included in error metric calculations.
Power(dB)	Power(dB) specifies the average power of UE-specific RS relative to the 0 dB point determined by the C-RS Power Boost parameter in Downlink Control Channel Properties.
Port	Specifies on which logical antenna port UE-RSUE-specific Reference Signal is transmitted for the selected PDSCH user allocation. Possible selections are as follows: Port 5, Port 7, or Port 8 - single-layer beamforming

Lte Slot Symbol