LTE Allocation Editor (LTE-Advanced)

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 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., subframes that do not belong to the current direction are annotated by either "UL Up Link (reverse link: from cell phone to base station)" (when direction is set to downlink) or "DL Down Link (forward link: from base station to cell phone)" (when direction is set to uplink).

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 PDSCH Physical Downlink Shared Channel user allocations.

Downlink LTE Long Term Evolution Allocation Editor Parameters

Parameter

Description

RB Resource 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 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 does not support Transmission Mode 9 beamforming.

RB Auto Detect Mode

RB Auto Detect Mode specifies how the 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 demodulator will detect the relative PDSCH power level for each user allocation (PA).

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 EVM Error 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.

RNTI

Radio Network Temporary Identifier for this user.

This value is used for demodulating UE User 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.

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-RS UE-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
  • Ports 7-8 - dual-layer beamforming
  • Ports 7-N - TM9 N-layer beamforming

nSCID

Specifies the scrambling identity when the UE-RS Port is set to Port 7, Port 8, or Ports 7-8.

This parameter is autodetected and shown on the DL Decode Info trace as ScID when RB Auto Detect Mode is set to Decode PDCCH.

See 3GPP TS Technical Specification 36.211, Section 6.10.3 for more information.

Add Adds a user mapping.
Delete Deletes the selected user mapping.
   
PDSCH

The demodulator can autodetect PDSCH allocations.

When RB Auto Detect is selected, the demodulator will perform the type of autodetection specified by RB Auto Detect Mode.

When RB Auto Detect is cleared, PDSCH allocations need to be setup manually using the PDSCH parameters listed below.

See the Downlink user allocations and RB Auto Detect Mode topics for more information about configuring PDSCH allocations.

For downlink signals, auto detection does not support Transmission Mode 9 beamforming.

Precoding

Specifies the type of MIMO precoding performed on the current user's data. The possible choices are Transmit Diversity (TxDiv) and Spatial Multiplexing (SpMux).

When SpMux is selected, the parameters No. Layers, No. Codewords, CDD, and Codebook Idx must also be specified.

Power Based autodetection can detect allocations using either spatial multiplexing or transmit diversity, but not both. The Precoding parameter determines which type of precoding the demodulator looks for.

No. Layers

Specifies the number of layers for the current user.

The maximum number of layers allowed for any user in the LTE Allocation Editor is constrained to be less than or equal to Num of Meas Channels. For PDSCH allocations transmitted on C-RS antenna ports, the maximum number of layers is also constrained to be less than or equal to the Num of C-RS Ports.

No. Codewords

Specifies the number of code words (1 or 2) for the current user. The selections available are dependent on the number of layers and multiplexing mode, according to the standard.

CDD

Specifies the Cyclic Delay Diversity mode for the current user.

Possible selections are W/o CDD and Large CDD.

When Present is selected (under UE-specific RS in the user allocation table), CDD and Codebook Idx are disabled because codebook and CDD are only applied to C-RS based MIMO, not UE-specific RS based MIMO.

See Sections 6.3.4.2.1 and 6.3.4.2.2 in 3GPP TS 36.211 for more information about cyclic delay diversity.

Codebook Idx

Specifies the codebook index for the current user. The codebook index determines the precoding matrix. See Tables 6.3.4.2.3-1 and 6.3.4.2.3-2 in 3GPP TS 36.211.

When Present is selected (under UE-specific RS in the user allocation table), CDD and Codebook Idx are disabled because codebook and CDD are only applied to C-RS based MIMO, not UE-specific RS based MIMO.

   
Per-allocation Parameters  
Couple

Certain parameters can be coupled across all RB allocation groups. Selecting the Couple check box to the right of a parameter will couple that parameter across all RB allocation groups.

RB Start

Specifies the RB start boundary of the current allocation group for the current user.

RB End

Specifies the RB end boundary of the current allocation group for the current user.

Slot Start Specifies the slot start boundary of the current allocation group for the current user.
Slot End Specifies the slot end boundary of the current allocation group for the current user.
EPRE (dB)

Setting the per-antenna Energy Per Resource Element (EPRE) is an alternative way of specifying the CW0/1 Power for a user allocation.

EPRE (dB) = 10*log10( (CW0 Power + CW1 Power) / Np )

where Np = number of antenna ports

The demodulator assumes that CW0 Power = CW1 Power when EPRE is specified.

CW0 Mod Type

CW1 Mod Type

Sets the codeword modulation type. The possible selections are QPSK Quadrature phase shift keying, 16QAM, QAM64, QAM256 (only available when Enable Higher Order Modulation or Enable 1024 QAM is selected), or QAM1024 (only available when Enable 1024 QAM is selected)..

When the check box to the left of CW0 Mod Type or CW1 Mod Type is selected, the codeword is configured to be active for the currently selected PDSCH user mapping.

When the check box to the right of CW0 Mod Type or CW1 Mod Type is selected, the codeword modulation type is coupled across all slots.

CW0 MCS modulation and coding scheme Index

CW1 MCS Index

Specifies the MCS Index for decoding of the PDSCH in the absence of DCI Downlink Control Information. A value of -1 indicates that the parameter is not used.

CW0 Power (dB)

CW1 Power (dB)

Specifies the expected average power per resource element for symbols that do not contain Cell-specific RS according to the following equation:

CW Power = rA(dB) + C-RS Power Boost(dB)

When there are multiple antenna ports, the power is split among the antenna ports.

For example when there are two transmit antennas and CW0 Power is set to 0 dB, the expected average subcarrier power for CW0 would be -3 dB for each antenna port. This would be the power reported for PDSCH user allocations in the Frame Summary trace.

Codeword power is coupled across all slots when the check box to the right of the codeword power is selected.

Frame Index

(single-antenna, TDD only)

Specifies for which frame this allocation is active. Possible choices are Frame0 and Frame1.

Multi-Frame Analysis must be selected for this parameter to be available.

This parameter is only applicable to single-antenna TDD frame type 2 signals. Input > Channels must be set to 1 Channel or Single I+jQ.

   
Add Adds an allocation to the selected user.
Delete Deletes the selected allocation.

Uplink

This table lists and describes all the parameters available to configure user allocations for uplink channels and signals.

Uplink LTE Allocation Editor Parameters

Parameter

Description

RB Auto Detect

When RB Auto Detect is selected, the demodulator can autodetect PUSCH Physical Uplink Shared Channel, PUCCH Physical Uplink Control Channel, SRS Signaling Reference Signal, or PRACH Physical Random Access Channel when the necessary parameters are defined.

For PUSCH, PUCCH, and SRS autodetection, channel parameters include a Sync Slot parameter. There must be a unique sync slot in the channel/signal corresponding to the Sync Type setting in order for the frame boundary to be determined successfully. The signal will still demodulate when there is no unique sync slot, but the time indexes (slot, symbol, etc.) may be incorrect.

To configure the demodulator to automatically detect the sync slot, select the Auto Sync parameter for the channel or signal.

To specify a sync slot for a channel or signal, make sure the corresponding tab is active, then specify the Channel Parameters or Signal Parameters, and Per-slot Parameters for the sync slot.

See the Uplink user allocations topic for instructions on configuring uplink user allocations.

RB Auto Detect Mode Only Power Based RB autodetection is supported in uplink mode.
Auto-detect Power Levels Codeword power level autodetection is only available for downlink signals (when RB Auto Detect Mode is set to Decode PDCCH).
Cell ID Sets the uplink user's physical-layer Cell ID.
RNTI

Specifies the user's Radio Network Temporary Identifier.

RNTI is required for PUCCH and PUSCH decoding (see the PUCCH Bits and PUSCH Bits parameters).

Frame No.

Specifies the frame number to use for data in the Measurement Interval.

Frame number is used in the standard by PUCCH frequency hopping type 1 and for SRS.

Group Hop

Determines whether group hopping is enabled.

Selecting Group Hop disables Seq Hop.

Seq Hop

Determines whether sequence hopping is enabled.

Selecting Seq Hop disables Group Hop.

PUSCH, PUCCH, SRS, PRACH

These are the uplink channels/signals that can be defined for a user.

Channel/signal parameters for each user mapping are defined in the respective tabs on the left of the LTE Allocation Editor dialog. The parameters in each tab are described in the following sections in this topic. Click on a link below to navigate to the corresponding channel/signal's section:

PUSCH, PUCCH, SRS, PRACH

Present in Signal

Selecting the Present in Signal check box for a channel will add the channel to the current user's channel definitions in Composite Include and enable the parameters on the corresponding tab in the LTE Allocation Editor.

PRACH analysis is done separately from the other channels and signals. Selecting Present in Signal for PRACH will clear the Present in Signal check boxes for the other channels and signals.

Include in Analysis

Selecting the Include in Analysis check box will cause the channel to be shown on applicable traces and included in Error Summary calculations. When Include in Analysis is cleared, only the Frame Summary trace will show information about this user's PUSCH channel.

This parameter has the same effect as selecting or clearing check boxes in the Composite Include list of users and channels.

Add Adds a user allocation.
Delete Deletes the selected user allocation.
   
PUSCH

The demodulator can autodetect PUSCH allocations and group them by modulation type.

When RB Auto Detect is selected, the demodulator will autodetect PUSCH allocations that match the required parameters.

See the RB Auto Detect row (above) in this table for more information about configuring autodetection parameters.

Also, see the PUSCH allocations topic for instructions on configuring PUSCH.

Channel Parameters  
Auto Sync

Auto Sync sets the demodulator to automatically find a sync slot.

RB Auto Detect selected:

  • Auto Sync selected: the sync slot will be chosen automatically given channel parameters and channel powers. The resource block allocation of the sync slot does not need to be specified.
  • Auto Sync cleared: the sync slot index is specified by the Sync Slot parameter. The sync slot will be found within the frame given the sync slot's resource block allocation and channel parameters.

RB Auto Detect cleared:

  • Auto Sync selected: the sync slot will be automatically chosen from the list of slot allocations. A unique slot with the highest correlation will be chosen as the sync slot. When there is no unique slot, the slot with the highest correlation will be chosen as the sync slot.
  • Auto Sync cleared: the sync slot index is specified by the Sync Slot parameter. The sync slot index determines which of the slot allocations defined for the current user to use as the sync slot.
Sync Slot

Specifies the index of the slot to use for initial synchronization when PUSCH DM-RS DeModulation Reference Signal (LTE) is selected as the Sync Type.

The demodulator searches for the slot with the characteristics specified in Per-slot Parameters, and the slot that matches the Per-slot Parameters with the highest correlation will be assigned the slot number given in the Sync Slot parameter.

To specify a sync slot for PUSCH, make sure the PUSCH tab is active, then specify Sync Slot, Channel Parameters, and Per-slot Parameters for the sync slot.

Freq. Hopping

Specifies whether frequency hopping has been enabled for the current user. The available selections are the following:

  • Off
  • Type 1, +1/4
  • Type 1, -1/4
  • Type 1, +1/2
  • Type 2

When the number of uplink resource blocks is greater than or equal to 50, all five selections are available.

When the number of uplink resource blocks is less than 50, only the Off, Type 1, +1/2, and Type 2 selections are available.

When Freq Hopping is set to Off, signals that use frequency hopping can still be demodulated as long as the correct physical resource blocks and mirroring information is provided.

See Sections 8.4.1 and 8.4.2 of 3GPP TS 36.213 for more information about hopping bits.

Freq. HopMode

Specifies whether the signal undergoes inter-subframe hopping or intra and inter-subframe hopping.

Possible selections are Inter-SF and Intra/Inter-SF.

This parameter is available only when Freq Hopping is set to a value other than Off.

NRBHO 1) Hopping Offset (LTE), or 2) Handover: The process in which an mobile station (MS) migrates from the air-interface provided by one base station (BS) to the air-interface provided by another base station (BS). Two HO variants are definded: -break-before-make HO: A HO where service with the target BS starts after a disconnection of service with the previous serving BS. - make-before-break HO: A HO where service with the target BS starts before disconnection of the service with the previous serving BS.

Specifies the PUSCH frequency hopping offset in number of resource blocks.

See Section 5.3.4 of 3GPP TS 36.211 for more information.

NSB

Specifies the number of frequency hopping sub-bands. This is a higher layer parameter.

See Section 5.3.4 of 3GPP TS 36.211 for more information.

Auto-calculate per-slot params Selecting this parameter causes DMRS Group, DMRS Seq, and DMRS Cyclic Shift to be set for each slot allocation automatically using the following parameters.
nDMRS(1)

Specifies the value of nDMRS(1) used by the selected user mapping.

See Section 5.5.2.1.1 of 3GPP TS 36.211 for more information.

Dss

Specifies the value of the higher-layer parameter deltaPUCCH-Shift (Dss ) used by the selected user mapping.

See Section 5.4.1 of 3GPP TS 36.211 for more information.

Enable nIDPUSCH

Selecting this checkbox enables the nIDPUSCH setting.

See Section 5.5.1.5 of 3GPP TS 36.211 for more information.

nIDPUSCH

When Enabled, this setting specifies the selected user mapping's virtual cell ID for PUSCH transimssions.

Virtual cell IDs were introduced as part of Coordinated Multi-Point (CoMP) in 3GPP Release 11. Virtual cell IDs enable, among other scenarios, the ability to receive DL transmissions from one cell, while sending UL transmissions to another cell. The Virtual Cell ID may be different from the Physical Cell ID, and it may be different between PUSCH and PUCCH.

See Section 5.5.1.5 of 3GPP TS 36.211 for more information.

Enable nIDcsh_DMRS

Selecting this checkbox enables the nIDcsh_DMRS setting.

See Section 5.5.2.1.1 of 3GPP TS 36.211 for more information.

nIDcsh_DMRS

When Enabled, this setting specifies the selected user mapping's DMRS virtual cell ID for PUSCH transimssions.

Virtual cell IDs were introduced as part of Coordinated Multi-Point (CoMP) in 3GPP Release 11. Virtual cell IDs enable, among other scenarios, the ability to receive DL transmissions from one cell, while sending UL transmissions to another cell. The Virtual Cell ID may be different from the Physical Cell ID, and it may be different between PUSCH and PUCCH.

See Section 5.5.2.1.1 of 3GPP TS 36.211 for more information.

Use CS from DCI

Selecting this parameter instructs the VSA software to use the CS Field and Layer (λ) parameters to calculate and set the nDMRS(2) and OCC parameters.

CS Field

Specifies the cyclic shift field present in the DCI Format 0 or 4.

See Section 5.5.2.1.1-1 of 3GPP TS 36.211 for more information.

Layer (λ)

Specifies the index of the layer of the MIMO signal that is being analyzed.

See Section 5.5.2.1.1-1 of 3GPP TS 36.211 for more information.

nDMRS(2)

Specifies the value of nDMRS(2) used by the selected user mapping.

See Section 5.5.2.1.1 of 3GPP TS 36.211 for more information.

OCC

Specifies the orthogonal cover code that is used by the PUSCH DM directed mesh: The realizations of a physical mesh using substantially directional antennas. See also: mesh-RS sequence.

See Section 5.5.2.1.1-1 of 3GPP TS 36.211 for more information.

   
Per-slot Parameters  
Couple

Selecting the check box to the right of a parameter will couple that parameter across all PUSCH RB allocation groups.

PRB Start/VRB Start

Specifies the physical/virtual RB start boundary in frequency. This parameter is specified in virtual resource blocks when Freq. Hopping is enabled and is specified in physical resource blocks when Freq. Hopping is set to Off.

PRB End/VRB End

Specifies the physical/virtual RB end boundary in frequency. This parameter is specified in virtual resource blocks when Freq. Hopping is enabled and is specified in physical resource blocks when Freq. Hopping is set to Off.

Mod Type

PUSCH modulation type: QPSK, 16QAM, QAM64, QAM256 (only available when Enable Higher Order Modulation or Enable 1024 QAM is selected), or QAM1024 (only available when Enable 1024 QAM is selected)..

Power (dB)

Sets the PUSCH average power level.

PUSCH, PUCCH, PUSCH DM-RS, PUCCH DM-RS, and SRS powers are specified relative to the 0 dB level determined by the power of the channel/signal chosen for synchronization. See Sync Type for more information.

DMRS Group (u)

Specifies the DMRS Group (u) for a slot.

When Auto-calculate per-slot params is selected, this parameter is disabled.

When Auto-calculate per-slot params is cleared and RB Auto Detect is selected, the value of this parameter is assumed to apply to all allocated slots.

DMRS Seq (v)

Specifies the DMRS Sequence (v) for a slot.

When Auto-calculate per-slot params is selected, this parameter is disabled.

When Auto-calculate per-slot params is cleared and RB Auto Detect is selected, the value of this parameter is assumed to apply to all allocated slots.

DMRS Cyclic Shift

Specifies the DMRS Cyclic Shift for a slot.

When Auto-calculate per-slot params is selected, this parameter is disabled.

When Auto-calculate per-slot params is cleared and RB Auto Detect is selected, the value of this parameter is assumed to apply to all allocated slots.

DMRS Power (dB)

Specifies the average PUSCH DMRS power.

PUSCH, PUCCH, PUSCH DM-RS, PUCCH DM-RS, and SRS powers are specified relative to the 0 dB level determined by the power of the channel/signal chosen for synchronization. See Sync Type for more information.

Mirroring

Specifies mirroring (fm(i) defined in Section 5.3.4 of 3GPP TS 36.211) when Freq Hopping is set to Off and RB Auto Detect is cleared.

Possible values are 0 and 1. Mirroring is autodetected when RB Auto Detect is selected.

To analyze signals without frequency hopping or with Type 1 frequency hopping, set Mirroring to 0.

To analyze signals with Type 2 frequency hopping, set Mirroring to the appropriate mirroring value.

CUR_TX Transmit or transmitter_NB mod 2

Specifies the value of the higher layer parameter CURRENT_TX_NB, modulo 2.

This parameter is only used when RB Auto Detect is cleared, there is one subband (NSB  = 1), Freq Hopping is set to a value other than Off, and Freq.HopMode is set to Inter-SF.

Possible values for this parameter are 0 or 1.

   
Add Adds a slot allocation.
Delete Deletes the selected slot allocation.
Slot Up Moves the selected slot allocation up in time (increasing slot number).
Slot Down Moves the selected slot allocation down in time (decreasing slot number).
   
PUCCH

The demodulator can analyze PUCCH signals.

When RB Auto Detect is selected, all PUCCH allocations that match the parameters given in Channel Parameters and Per-slot Parameters will be autodetected.

When RB Auto Detect is cleared, PUCCH subframe allocations will need to be defined manually.

Channel Parameters  
Auto Sync

Auto Sync configures the demodulator to automatically find a sync slot. This parameter does not have any effect when Sync Type is set to a channel/signal other than PUCCH DMRS.

RB Auto Detect selected:

  • Auto Sync selected: the sync slot will be chosen automatically given the Auto-calculate parameters (when Auto-calculate is selected) and Per-slot Parameters.

  • Auto Sync cleared: the sync slot index is specified by the Sync Slot parameter.
    • Auto-calculate selected: the combination of the Auto-calculate and Per-slot Parameters determine the settings for all PUCCH slots. The Sync Slot parameter chooses which slot to use for synchronization.
    • Auto-calculate cleared: the Per-slot Parameters will be used to find the sync slot and that slot will be assigned the number specified by the Sync Slot parameter.

PUCCH Format and nPUCCH(1) are expected to be constant for the entire frame unless Auto-detect Format/nPUCCH(1)  is selected.

RB Auto Detect cleared:

  • Auto Sync selected: the sync slot will be automatically chosen from the list of subframe allocations. A unique slot with the highest correlation will be chosen as the sync slot.
  • Auto Sync cleared: the sync slot index is specified by the Sync Slot parameter. The sync slot index determines which of the subframe allocations defined for the current user is used as the sync slot.
Sync Slot

Specifies the index of the slot to use for initial synchronization when PUCCH DM-RS is selected as the Sync Type.

The demodulator searches for the slot with the characteristics specified in Per-slot Parameters, and the slot that matches the Per-slot Parameters with the highest correlation will be assigned the slot number given in the Sync Slot parameter.

To specify a sync slot for PUCCH, make sure the PUCCH tab is active, then specify Sync Slot, Channel Parameters, and Per-slot Parameters for the sync slot.

Auto-calculate

Sets PUCCH Per-slot Parameters First RB, Cyclic Shift, OS, and DMRS Group (u) to be automatically calculated for each slot given the parameters NRB(2), NCS(1) , nPUCCH(1) , nPUCCH(2) , DshiftPUCCH which are defined in 3GPP TS 36.211 Section 5.4.

NRB(2)

Specifies the number of resource blocks per slot that are available for PUCCH type 2/2a/2b transmissions.

NRB(2) is an integer in the range [0, frequency width of frame in units of RB].

NCS(1)

Specifies the number of cyclic shifts used for PUCCH formats 1/1a/1b in a resource block with a mix of formats 1/1a/1b and 2/2a/2b.

nPUCCH(2)

Resource index for PUCCH formats 2/2a/2b.

DshiftPUCCH

DshiftPUCCH is a higher-layer parameter.

Enable nIDPUCCH

Selecting this parameter enables the nIDPUCCH setting.

See Section 5.5.1.5 of 3GPP TS 36.211 for more information.

nIDPUCCH

When Enabled, this setting specifies the selected user mapping's virtual cell ID for PUCCH transimssions.

Virtual cell IDs were introduced as part of Coordinated Multi-Point (CoMP) in 3GPP Release 11. Virtual cell IDs enable, among other scenarios, the ability to receive DL transmissions from one cell, while sending UL transmissions to another cell. The Virtual Cell ID may be different from the Physical Cell ID, and it may be different between PUSCH and PUCCH.

See Section 5.5.1.5 of 3GPP TS 36.211 for more information.

Auto-detect Format/nPUCCH(1)/nPUCCH(3)

Selecting this check box enables autodetection of PUCCH Format and nPUCCH(1) for all subframes. This is useful when the format and/or nPUCCH(1) value is different for each subframe.

When this parameter is cleared and RB Auto Detect is selected, PUCCH parameters are autodetected, but PUCCH Format and nPUCCH(1) are expected to be constant for the entire frame.

When this parameter is selected, the Auto Sync check box is disabled. When Sync Type is set to PUCCH DMRS, you must define a sync slot by setting the Per-Slot Parameters for the sync slot as well as setting the index using the Sync Slot parameter.

   
Per-slot Parameters  
Couple

Selecting the check box to the right of a parameter will couple that parameter across all PUCCH subframe allocation groups.

First RB

Sets the RB index for the even-numbered slot in the current subframe allocation. The odd-numbered slot's PUCCH allocation will automatically be set according to the LTE-Advanced standard (mirrored in frequency).

For example, in a 5 MHz Megahertz: A unit of frequency equal to one million hertz or cycles per second. LTE signal (25 RBs), when Slot 0 contains a PUCCH allocation at RB 0, Slot 1 will be set to have a PUCCH allocation at RB 24.

A user can only have one RB allocated to PUCCH per slot.

Format

Sets the PUCCH type.

When RB Auto Detect is selected, the value selected for the Format parameter is assumed to apply to all allocated slots.

Cyclic Shift

Sets PUCCH cyclic shift.

When Auto-calculate is selected, this parameter is disabled.

When Auto-calculate is cleared and RB Auto Detect is selected, the value of this parameter is assumed to apply to all allocated slots.

OS

Sets the Orthogonal Sequence index for PUCCH.

When Auto-calculate is selected, this parameter is disabled.

When Auto-calculate is cleared and RB Auto Detect is selected, the value of this parameter is assumed to apply to all allocated slots.

Power (dB)

Specifies the average PUCCH DMRS power for a slot.

PUSCH, PUCCH, PUSCH DM-RS, PUCCH DM-RS, and SRS powers are specified relative to the 0 dB level determined by the power of the channel/signal chosen for synchronization. See Sync Type for more information.

DMRS Group (u)

Sets the group number for the PUCCH demodulation reference signal (DMRS).

When Auto-calculate is selected, this parameter is disabled.

When Auto-calculate is cleared and RB Auto Detect is selected, the value of this parameter is assumed to apply to all allocated slots.

DMRS Power (dB)

Sets the average power level for the PUCCH demodulation reference signal (DMRS) during the selected subframe.

PUSCH, PUCCH, PUSCH DM-RS, PUCCH DM-RS, and SRS powers are specified relative to the 0 dB level determined by the power of the channel/signal chosen for synchronization. See Sync Type for more information.

nPUCCH(1) Resource index for PUCCH Types 1/1a/1b.
nPUCCH(3) Resource index for PUCCH Type 3.
   
Add Adds a subframe allocation.
Delete Deletes the selected subframe allocation.
Subframe Up Moves the selected subframe allocation up in time (increasing subframe number) to the closest available subframe allocation for a user.
Subframe Down Moves the selected subframe allocation down in time (decreasing subframe number) to the closest available subframe allocation for a user.
   

SRS

For SRS autodetection, the following Signal Parameters need to be specified. Only SRS transmissions that match these parameters will be autodetected.

SRS is always autodetected whether or not RB Auto Detect is selected.

In calculating the parameter nSRS, nf is always set to zero. The nSRS calculation is listed in Section 5.5.3.2 of 3GPP TS 36.211.

Signal Parameters  
Auto Sync

Auto Sync sets the demodulator to automatically find a sync slot.

  • Auto Sync selected: the sync slot will be chosen automatically using the SRS Signal Parameters.
  • Auto Sync cleared: the sync slot index is specified by the Sync Slot parameter. The sync slot will be located within the frame using the SRS Signal Parameters.
Sync Slot

Specifies the index of the slot to use for initial synchronization when SRS is selected as the Sync Type.

The demodulator searches for the slot with the characteristics specified in the Signal Parameters, and the slot that matches the Signal Parameters with the highest correlation will be assigned the slot number given in the Sync Slot parameter.

To specify a sync slot for SRS, make sure the SRS tab is active, then specify Sync Slot and Signal Parameters for the sync slot.

Cyclic Shift (nSRSCS)

nSRSCS determines the cyclic shift (a) of SRS from the equation in Section 5.5.3.1 in 3GPP TS 36.211. 

Power (dB) Specifies the average power for SRS.

PUSCH, PUCCH, PUSCH DM-RS, PUCCH DM-RS, and SRS powers are specified relative to the 0 dB level determined by the power of the channel/signal chosen for synchronization. See Sync Type for more information.

SRS Bandwidth(BSRS)

Specifies the SRS bandwidth. This parameter, along with CSRS, determines the values of mSRS,b and Nb from Tables 5.5.3.2-1 through 5.5.3.2-4 in TS 36.211.

Possible values for this parameter are in the set {0, 1, 2, 3}.

SRS BW Config(CSRS)

Specifies the SRS bandwidth configuration. This parameter, along with BSRS, determines the values of mSRS,b and Nb from Tables 5.5.3.2-1 through 5.5.3.2-4 in TS 36.211.

Possible values for this parameter are in the set {0, 1, 2, 3, 4, 5, 6, 7}.

SRS Hopping BW(bhop)

Specifies the SRS parameter bhop. This parameter determines whether SRS frequency hopping is enabled. SRS frequency hopping is enabled when bhop < BSRS.

The possible values for this parameter are in the set {0, 1, 2, 3}.

Tx Comb (kTC)

kTC is the transmissionComb parameter which is specified for the UE by higher layers. This parameter influences the starting frequency location of SRS.

See Section 5.5.3.2 in 3GPP TS 36.211 for more information.

The possible values for this parameter are in the set {0, 1}.

Freq Dom Pos(nRRC)

nRRC is the freqDomainPosition parameter and is specified by higher layers. This parameter is used in calculating nb, the frequency position indexes.

See Section 5.5.3.2 in 3GPP TS 36.211 for more information.

Subframe Config

Specifies the value for srsSubframeConfiguration in Table 5.5.3.3-1 (FDD Frequency Division Duplex: A duplex scheme in which uplink and downlink transmissions use different frequencies but are typically simultaneous.) or Table 5.5.3.3-2 (TDD) in TS 36.211. srsSubframeConfiguration determines TSFC and DSFC.

Possible values are integers in the range [0,15].

Config Index(ISRS)

Specifies the SRS Configuration Index value which determines SRS periodicity and subframe offset configuration from Table 8.2-1 for FDD and Table 8.2-2 for TDD in 3GPP TS 36.213.

The possible values for this parameter are the integers in the range [0, 1023].

SRSMaxUpPTS

(TDD only)

Specifies the upper-layer parameter srsMaxUpPts. This parameter determines whether SRS can occupy all frequency domain positions in the UpPTS section of special subframes.

When SRSMaxUpPTS = True, all subcarriers are available to be allocated for SRS transmissions.

When SRSMaxUpPTS = False, SRS cannot be located in subcarriers reserved for PRACH transmissions. Subcarriers reserved for PRACH transmissions are calculated using the parameters SRS NraS1 and SRS NraS6.

See Section 5.5.3.2 of 3GPP TS 36.211 for more information about SRSMaxUpPTS.

SRS NraS1

(TDD only)

Specifies the number of PRACH preamble allocations in UpPTS during the first special subframe (subframe 1).

SRS NraS6

(TDD only)

Specifies the number of PRACH preamble allocations in UpPTS during the second special subframe (subframe 6).
   

PRACH

The demodulator can detect and demodulate PRACH preamble formats 0-3 given the Channel Parameters listed below.

The demodulator auto-detects all PRACH preambles matching the specified PRACH Channel Parameters.

For FDD, the first PRACH preamble found is numbered as the lowest subframe corresponding to the specified Configuration Index and subsequent preambles are specified relative to that. For example, if the first PRACH allocation is in subframe 2, the demodulator would assign subframe 2 to the first PRACH preamble found.

For TDD, PRACH resources can be multiplexed both in time domain and frequency domain. The exact locations are determined by PRACH Configuration Index and the LTE-Advanced component carrier's uplink-downlink configuration.

PRACH analysis is performed separately from PUSCH, PUCCH, and SRS.

The demodulator assumes that nf, the system frame number, is 0 when performing PRACH analysis.

Channel Parameters  
NRA 1) Random Access, or 2) Receiver AddressPRBoffset

Specifies the index of the first RB available for PRACH transmission in each subframe.

This parameter only applies to PRACH formats 0-3 and does not affect the start location of a format 4 preamble.

The minimum value is 0, and the maximum value is [number of resource blocks in a slot] - 6.

Configuration Index

Specifies the PRACH-Configuration-Index parameter. This parameter determines the PRACH preamble format and the locations where PRACH can be transmitted in the frame.

This information is given in Table 5.7.1-2 for frame type 1 FDD signals and in Table 5.7.1-3 for frame type 2 TDD signals in 3GPP TS 36.211.

Logical Root Seq Index

Specifies the value of RACH_ROOT_SEQUENCE which is the logical index for the Zadoff-Chu sequence used in generating the PRACH preambles for the cell.

For preamble formats 0-3, there are 838 total logical indexes. For preamble format 4, there are 138 logical indexes.

The mapping between logical and physical Zadoff-Chu indexes is given in Table 5.7.2-4 for preamble formats 0-3 and in Table 5.7.2-5 for preamble format 4 in TS 36.211.

Cyclic Shift Set

Specifies the setting of the higher-layer parameter High-speed-flag, which determines whether the restricted or unrestricted cyclic shift set is used.

This parameter, along with the NCS Configuration parameter determine the value of NCS for PRACH preamble formats 0-3. See Table 5.7.2-2 in 3GPP TS 36.211.

Possible values for this parameter are Restricted or Unrestricted.

NCS Configuration

Specifies the NCS configuration index which, along with Cyclic Shift Set, determines the value of NCS used for PRACH preamble generation for preamble formats 0-3. However, only NCS Configuration is needed to determine the value of NCS for PRACH preamble format 4.

NCS values for PRACH preamble formats 0-3 are in Table 5.7.2-2 and NCS values for PRACH preamble format 4 are in Table 5.7.2-3 in TS 36.211.

NCS Configuration is an integer between 0 and 15.

Preamble Auto-detect

Specifies whether PRACH Preamble Auto-detect is ON or OFF.

When Preamble Auto-detect = True (ON), the PRACH Preamble Index will be auto-detected for each active PRACH Resource matching the configured PRACH Channel Parameters and reported within the Frame Summary trace results as PRACH Resource PID (Preamble ID).

When Preamble Auto-detect = False (OFF), only active PRACH Resources matching the PRACH Channel Parameters and manually specified PRACH Preamble Index will be included within the Frame Summary trace results.

Preamble Index

Specifies which of the 64 preambles in the cell is being used by the LTE signal being analyzed.

There are 64 possible preamble sequences for the cell. The higher-layer parameter RACH_ROOT_SEQUENCE (specified by Logical Root Seq Index) specifies a Zadoff-Chu physical root sequence index from Tables 5.7.2-4 and 5.7.2-5 in 3GPP TS 36.211.

Preamble sequences are generated as as cyclic shifts of the Zadoff-Chu (ZC) sequence determined by the physical root sequence index. When there are fewer than 64 cyclic shifts available, the logical sequence index is incremented and the preamble sequences are generated from cyclic shifts of the resulting ZC sequence. This is repeated until all 64 preamble sequences have been generated.

See Section 5.7.2 in 3GPP TS 36.211 for more information.

Possible values are integers in the range [0, 63].

Power (dB) Specifies the average power of PRACH subcarriers.

Sync Resource

(TDD only)

Sync Resource is a demodulator-specific parameter that determines which PRACH resource to use for initial synchronization.

Table 5.7.1-4 in 3GPP TS 36.211 lists the possible PRACH mappings. PRACH Configuration Index and frame UL/DL configuration determine which of the mappings is used.

Certain mappings define multiple PRACH resources. The value of the Sync Resource parameter determines which PRACH resource is used for initial synchronization, with Sync Resource = 0 being the first PRACH resource in the table cell.

See Also

Setting Up User Allocations

Setting up an LTE-Advanced Measurement