This Physical Channel Downlink configuration has several different possible channel setups (e.g. PBCH, PDCCH, ...). The screen shot below shows the parameter choices for a PBCH channel. In the N7625C Signal Studio software, click a different channel to view that channel's parameter choices. The links for all of the channel's parameters and their descriptions are listed in the tables below.
Before adding a physical channel as described below, delete any existing transport channel, physical channel, or resource block collection that occupies the resource blocks that your new physical channel will occupy. If you add a new physical channel without first deleting a conflicting channel or resource block collection, a "code conflicted" error occurs when you generate the waveform.
To add a new physical channel, click the Add Channel button, and select the physical channel type (PBCH, PDCCH, PDSCH, PDFICH, or PHICH) to add. The software adds the new channel above the currently selected channel in the list. The software assigns a channel identifying number to the new channel that corresponds to its position in the list and increments the identifying numbers of subsequent channels in the list.
Similarly, if you delete the selected channel using the Delete Channel button, the software adjusts the identifying numbers of the subsequent channels according to their new positions in the list.
If you select an existing PDSCH channel and click the Physical Channel Configuration button, the Configure PDSCH window opens in which you can specify the modulation type, frame number, subframe number, and resource blocks for the PDSCH. If you are adding a new PDSCH, when you click OK, the PDSCH channel is added to the bottom of the list of resource block collections in the Resource Block node and numbered accordingly. A physical channel occupies one subframe (two slots) and therefore occupies two resource block collections. The PDSCH also appears in the resource mapping graph in the position (subframe and resource blocks) that you have specified.
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PDCCH |
PDSCH |
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1. General Settings |
1. General Settings |
1. General Settings |
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PCFICH |
PHICH |
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1. General Settings |
1. General Settings |
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Range:
1 to 3 for number of downlink resource blocks > 10 (see System Bandwidth)
2 to 4 for number of downlink resource blocks ≤ 10 (see System Bandwidth)
Displays the control format indicator (1, 2, 3 or 4) for each subframe in the selected PCFICH channel. These values are set in the PDCCH Allocations cell.
Use the Data Source Selection dialog box to select one of the following to use for the data.
For PBCH select , , or .
For PDSCH select , , , or .
is displayed in the cell if the selected physical channel is controlled by a channel defined in the Transport Channel layer.
Displays the modulation type for the selected physical channel.
Displays the name (type) of the selected physical channel.
PBCH = Physical Broadcast Channel
PDCCH = Physical Downlink Control Channel
PDSCH = Physical Downlink Shared Channel
PCFICH = Physical Control Format Indicator Channel
PHICH = Physical HARQ Indicator Channel
Displays the identifying number of the selected physical channel.
Range: -60.000 to 20.000 dB
Default: 0.000 dB
Enter a power level in dB for the selected channel. See Power Settings (Downlink) for a description of how the software applies your power setting.
For physical channels (PDSCH, PUSCH or PUCCH), displays the numbers of the resource block collection to which the channel belongs. A physical channel occupies one subframe (two slots) and therefore occupies two resource block collections.
Choice: Off | On | Manual
Default: On
Double-click or use the drop-down menu to turn scrambling for the physical channel on or off.
Range:
1 to 3 for number of downlink resource blocks > 10 (see System Bandwidth)
2 to 4 for number of downlink resource blocks <= 10 (see System Bandwidth).
For DCI channels, you can set PDCCH Allocations for each subframe as described in 3GPP TS 36.211.
The values you set here are displayed in the CFI cell for the corresponding PCFICH channel. The resource mapping graph is updated to show the current setting when you click outside the cell.
Choice: 1/6 | 1/2 | 1 | 2
Default: 1/6
Double-click or use the drop-down menu to set the allocation value for the selected PHICH channel. The software sets the PHICH Maximum Group Number, based on the PHICH Allocation value.
The PHICH carries the hybrid-ARQ ACK/NAK. Multiple
PHICHs mapped to the same set of resource elements constitute a PHICH
group, where PHICHs within the same PHICH group are separated through
different orthogonal sequences. A PHICH resource is identified by the
index pair 
, where
is
the PHICH group number and 
is the orthogonal sequence index within
the group.
For frame structure
type 1, the number of PHICH groups 
is constant in all subframes and given by
where 
is provided by higher layers. The index 
ranges from 0 to 
.
For
frame structure type 2, the number of PHICH groups may vary between downlink
subframes and is given by 
where 
is given by Table 1 below and 
by the expression
above. The index 
in a downlink subframe with non-zero PHICH resources
ranges from 0 to 
.
Table 1: The factor for frame structure type 2
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Uplink-downlink Configuration |
Subframe Number i |
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|---|---|---|---|---|---|---|---|---|---|---|
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0 |
1 |
2 |
3 |
4 |
5 |
6 |
7 |
8 |
9 |
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0 |
2 |
1 |
- |
- |
- |
2 |
1 |
- |
- |
- |
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1 |
0 |
1 |
- |
- |
1 |
0 |
1 |
- |
- |
1 |
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2 |
0 |
0 |
- |
1 |
0 |
0 |
0 |
- |
1 |
0 |
|
3 |
1 |
0 |
- |
0 |
- |
0 |
0 |
0 |
1 |
1 |
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4 |
0 |
0 |
- |
- |
0 |
0 |
0 |
0 |
1 |
1 |
|
5 |
0 |
0 |
- |
0 |
0 |
0 |
0 |
0 |
1 |
0 |
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6 |
1 |
1 |
- |
- |
- |
1 |
1 |
- |
- |
1 |
Range: -60 to 20 dB
Default: 0 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 settings.
Choice: Normal | Extended
Default: Normal
Double-click or use the drop-down menu to set the PHICH Duration to or for the selected PHICH channel. See 3GPP TS 36.211.
Range: 1 to 8
The software sets the maximum group number for the selected PHICH channel based on the PHICH Allocation selection. See 3GPP TS 36.211.
Multiple PHICHs mapped to the same set of resource elements constitute a PHICH group, where PHICHs within the same PHICH group are separated through different orthogonal sequences.
Set the Mi definition mode of PHICH channel. If the PHICH Mi definition mode is ETM, all the Mi will be set to 1. See 3GPP TS 36.141 for detail.
Range: 0 to 65535
Default: 0
Enter a value for the Radio Network Temporary Identifier (RNTI). Refer to 3GPP TS 36.211.
Choice: Off | On
Default: On
Double-click or use the drop-down menu to turn the channel On or Off.
This parameter is read-only for physical channels that are occupied by a higher layer.
Click the 
button in this cell to open the 
PDCCH Tx
configuration
window.
The physical downlink control channel carries scheduling assignments
and other control information. A physical control channel is transmitted
on an aggregation of one or several consecutive control channel elements
(CCEs), where a control channel element corresponds
to 9 resource element groups. The number of resource-element groups not
assigned to PCFICH or PHICH is 
. The CCEs available in the system are numbered
from 0 and 
, where
. The PDCCH
supports multiple formats as listed in Table 2 below. A PDCCH consisting
of n consecutive
CCEs may only start on a CCE fulfilling
, where i is the CCE
number.
Table 2: Supported PDCCH formats
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PDCCH format |
Number of CCEs |
Number of resource element groups |
Number of PDCCH bits |
|---|---|---|---|
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0 |
1 |
9 |
72 |
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1 |
2 |
18 |
144 |
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2 |
4 |
36 |
288 |
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3 |
8 |
72 |
576 |
Click the button in this cell to open the PHICH Tx
configuration
window.
