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Configure PRACH Preamble |
Detail Parameters |
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These additional parameters are displayed when Auto-configuration is set to PRACH Test Preamble (36.141).
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Additional Detail Parameters |
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Choice: 1.4 MHz (6RB) | 3 MHz (15RB) | 5 MHz (25RB) | 10 MHz (50RB) | 15 MHz (75RB) | 20 MHz (100RB)
Default: 5 MHz (25RB)
Double-click or use the drop-down menu to set the system bandwidth and number of Resource Blocks (RB).
Range: 0 to maximum number of RB in the System Bandwidth - 6.
Default: 0
Enter the number of resource blocks by which to offset the PRACH preamble.
|
System Bandwidth |
Resource Block Offset Range |
Resource Block Offset Default Value |
|---|---|---|
|
1.4 MHz |
0 |
0 |
|
3 MHz |
0 to 9 |
0 |
|
5 MHz |
0 to 19 |
0 |
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10 MHz |
0 to 44 |
0 |
|
15 MHz |
0 to 69 |
0 |
|
20 MHz |
0 to 94 |
0 |
Choice: RA Configuration | PRACH Test Preambles (36.141)
Default: RA Configuration
Double-click or use the drop-down menu to set Auto-configuration.
Where Auto-configuration = RA configuration, the value of Waveform Generation Length is automatically set by the software based on PRACH Configuration Index parameter.
Where Auto-configuration = PRACH Test Preamble (36.141), the wizard configures PRACH Test Preambles based on 3GPP TS 36.141 and without Cyclic Shift v. In this case, you must set the Preamble Index to satisfy Cyclic Shift v as defined in 36.141 on setting the PRACH Test Preambles (refer to tables below).
Example: Auto-configuration = PRACH Test Preamble (36.141),Cyclic Shift Set = Normal Mode, and Burst (Preamble) Format = 0, so Preamble Index should be set to 32 to satisfy Cyclic Shift v = 32 (refer to 34.141 and tables below).
Test Preambles for Normal Mode
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Burst Format |
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|---|---|---|---|
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0 |
13 |
22 |
32 |
|
1 |
167 |
22 |
2 |
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2 |
167 |
22 |
0 |
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3 |
0 |
22 |
0 |
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4 |
10 |
0 |
0 |
Test Preambles for High Speed Mode
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Burst Format |
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|---|---|---|---|
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0 |
15 |
384 |
0 |
|
1 |
202 |
384 |
0 |
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2 |
202 |
384 |
0 |
|
3 |
237 |
384 |
0 |
This parameter is read only and the value is automatically set by the software based on PRACH Configuration Index.
The software sets the Preamble Format based on the PRACH Configuration Index as shown in the table for that parameter.
|
Preamble Format |
PRACH Cyclic Prefix Length (Tcp) |
PRACH Sequence Length (Tseq) |
PRACH Length (Tcp + Tseq) |
|---|---|---|---|
|
0 |
3168 x Ts = 0.103125 ms |
24576 x Ts = 0.8 ms |
0.903.125 ms |
|
1 |
21024 x Ts = 0.684375 ms |
24576 x Ts = 0.8 ms |
1.484375 ms |
|
2 |
6240 x Ts = 0.203125 ms |
2 x 24576 x Ts = 1.6 ms |
1.803125 ms |
|
3 |
21024 x Ts = 0.684375 ms |
2 x 24576 x Ts = 1.6 ms |
2.284375 ms |
Range: 0 to 63
Default: 14
Enter a value for the PRACH Configuration Index. The software configures the PRACH bursts according to the following table when you click .
Index numbers 30, 46, 60, 61, and 62 are not assigned, and are not available for input.
|
PRACH Configuration index |
Preamble Format |
System Frame Number |
Subframe Number |
|---|---|---|---|
|
0 |
0 |
Even |
1 |
|
1 |
0 |
Even |
4 |
|
2 |
0 |
Even |
7 |
|
3 |
0 |
Any |
1 |
|
4 |
0 |
Any |
4 |
|
5 |
0 |
Any |
7 |
|
6 |
0 |
Any |
1, 6 |
|
7 |
0 |
Any |
2, 7 |
|
8 |
0 |
Any |
3, 8 |
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9 |
0 |
Any |
1, 4, 7 |
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10 |
0 |
Any |
2, 5, 8 |
|
11 |
0 |
Any |
3, 6, 9 |
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12 |
0 |
Any |
0, 2, 4, 6, 8 |
|
13 |
0 |
Any |
1, 3, 5, 7, 9 |
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14 |
0 |
Any |
0, 1, 2, 3, 4, 5, 6, 7, 8, 9 |
|
15 |
0 |
Even |
9 |
|
16 |
1 |
Even |
1 |
|
17 |
1 |
Even |
4 |
|
18 |
1 |
Even |
7 |
|
19 |
1 |
Any |
1 |
|
20 |
1 |
Any |
4 |
|
21 |
1 |
Any |
7 |
|
22 |
1 |
Any |
1, 6 |
|
23 |
1 |
Any |
2, 7 |
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24 |
1 |
Any |
3, 8 |
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25 |
1 |
Any |
1, 4, 7 |
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26 |
1 |
Any |
2, 5, 8 |
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27 |
1 |
Any |
3, 6, 9 |
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28 |
1 |
Any |
0, 2, 4, 6, 8 |
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29 |
1 |
Any |
1, 3, 5, 7. 9 |
|
30 |
N/A |
N/A |
N/A |
|
31 |
1 |
Even |
9 |
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32 |
2 |
Even |
1 |
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33 |
2 |
Even |
4 |
|
34 |
2 |
Even |
7 |
|
35 |
2 |
Any |
1 |
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36 |
2 |
Any |
4 |
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37 |
2 |
Any |
7 |
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38 |
2 |
Any |
1, 6 |
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39 |
2 |
Any |
2, 7 |
|
40 |
2 |
Any |
3, 8 |
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41 |
2 |
Any |
1, 4, 7 |
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42 |
2 |
Any |
2, 5, 8 |
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43 |
2 |
Any |
3, 6, 9 |
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44 |
2 |
Any |
0, 2, 4, 6, 8 |
|
45 |
2 |
Any |
1, 3, 5, 7. 9 |
|
46 |
N/A |
N/A |
N/A |
|
47 |
2 |
Even |
9 |
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48 |
3 |
Even |
1 |
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49 |
3 |
Even |
4 |
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50 |
3 |
Even |
7 |
|
51 |
3 |
Any |
1 |
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52 |
3 |
Any |
4 |
|
53 |
3 |
Any |
7 |
|
54 |
3 |
Any |
1, 6 |
|
55 |
3 |
Any |
2, 7 |
|
56 |
3 |
Any |
3, 8 |
|
57 |
3 |
Any |
1, 4, 7 |
|
58 |
3 |
Any |
2, 5, 8 |
|
59 |
3 |
Any |
3, 6, 9 |
|
60 |
N/A |
N/A |
N/A |
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61 |
N/A |
N/A |
N/A |
|
62 |
N/A |
N/A |
N/A |
|
63 |
3 |
Even |
9 |
Range: 0 to 837
Default: 0
Enter a value for the logical root sequence index. (See 3GPP TS 36.211.) This parameter is read-only when Auto-configuration is set to
The Logical Root Sequence Index is the value of RACH_ROOT_SEQUENCE which is the logical index for the Zadoff-Chu sequence used for PRACH preamble generation. There is a relationship between the Logical Root Sequence Index and the Physical Root Sequence Index given by Root Zadoff-Chu sequence order table and preamble format.
In the case where preambles corresponding to Preamble Index cannot be generated from a single root Zadoff-Chu sequence, Logical Root Sequence Index is incremented until corresponding Preamble sequences are found.
That incremented Logical Root Sequence Index is displayed in the Logical Root Sequence Index (Incremented) field.
Physical Root Sequence Index, Cyclic Shift v and Incremented Logical Root Sequence Index are automatically changed on GUI based on Cyclic Shift Set, Ncs Configuration, Logical Root Sequence Index and Preamble Index.
Range:
0 to 837 for Format 0 to 3
Default: 0
Displays a value for the incremented logical root sequence index. Refer to 3GPP TS 36.211.
In the case where preambles corresponding to Preamble Index cannot be generated from a single root Zadoff-Chu sequence, Logical Root Sequence Index is incremented until corresponding Preamble sequences are found.
That incremented Logical Root Sequence Index is displayed in the Logical Root Sequence Index (Incremented) field.
Physical Root Sequence Index, Cyclic Shift v and Incremented Logical Root Sequence Index are automatically changed on GUI based on Cyclic Shift Set, Ncs Configuration, Logical Root Sequence Index and Preamble Index.
Choice: Unrestricted Sets | Restricted Sets
Default: Unrestricted Sets
Double-click or use the drop-down menu to set the cyclic shift restriction method. (See 3GPP TS 36.211.)
The Unrestricted Set and Restricted Set value for each Ncs configuration is shown in the following table:
|
Ncs Configuration |
Unrestricted Set Value |
Restricted Set Value |
|---|---|---|
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0 |
0 |
15 |
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1 |
13 |
18 |
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2 |
15 |
22 |
|
3 |
18 |
26 |
|
4 |
22 |
32 |
|
5 |
26 |
38 |
|
6 |
32 |
46 |
|
7 |
38 |
55 |
|
8 |
46 |
68 |
|
9 |
59 |
82 |
|
10 |
76 |
100 |
|
11 |
93 |
128 |
|
12 |
119 |
158 |
|
13 |
167 |
202 |
|
14 |
279 |
237 |
|
15 |
419 |
- |
Range:
0 to 15 (Unrestricted) for Format 0 to 3
0 to 14 (Restricted) for Format 0 to 3
Default: 0
When Auto-configuration is set to RA Configuration, enter a value for the number of cycle shifts (Ncs) configuration for preamble generation.
Ncs value is determined by Ncs configuration, Cyclic Shift Set, and Preamble format.
The corresponding Unrestricted Sets values and Restricted Sets values are shown in the table for Cyclic Shift Set.
When Auto-configuration is set to PRACH Test Preambles (36.141), this parameter is read-only.
In the case preambles corresponding to Preamble Index cannot be generated from a single root Zadoff-Chu sequence, Logical Root Sequence Index is incremented until corresponding Preamble sequences are found.
That incremented Logical Root Sequence Index is displayed on Logical Root Sequence Index (Incremented) parameter.
Physical Root Sequence Index, Cyclic Shift v, and Incremented Logical Root Sequence Index are automatically changed on the PRACH Wizard based on Cyclic Shift Set, Ncs Configuration, Logical Root Sequence Index, and Preamble Index.
See 3GPP TS 36.211 and 26.141 for more information.
The software sets this value based on the Ncs Configuration setting.
Range: 0 to 63
Default: 0
Enter a value for the preamble index. (See 3GPP TS 36.211.)
When the Auto-configuration parameter is set to PRACH Test Preamble (36.141),you must set the Preamble Index to satisfy Cyclic Shift v as defined in 3GPP 36.141 (PRACH Test Preambles test).
Example: Auto-configuration = PRACH Test Preamble (3GPP TS 36.141),Cyclic Shift Set = Normal Mode, and Preamble Format = 0, so Preamble Index should be set to 32 to satisfy Cyclic Shift v = 32 (refer to 34.141 A.6).
| Test preambles for Normal Mode | |||
| Burst Format | Ncs value | Logical Root Sequence Index | Cycle Shift v |
| 0 | 13 | 22 | 32 |
| 1 | 167 | 22 | 2 |
| 2 | 167 | 22 | 0 |
| 3 | 0 | 22 | 0 |
| 4 | 10 | 0 | 0 |
| Test preambles for High Speed Mode | |||
| Burst Format | Ncs value | Logical Root Sequence Index | Cycle Shift v |
| 0 | 15 | 384 | 0 |
| 1 | 202 | 384 | 0 |
| 2 | 202 | 384 | 0 |
| 3 | 237 | 384 | 0 |
Refer to Preamble Index-related information in TS36.212 5.3.3.1.3, TS36.321 5.1, and TS36.331 6.3.2.
This parameter is read only and the value is automatically set by the software based on Logical Root Sequence Index and the Preamble Index.
In the case where preambles corresponding to Preamble Index cannot be generated from a single root Zadoff-Chu sequence, Logical Root Sequence Index is incremented until corresponding Preamble sequences are found.
That incremented Logical Root Sequence Index is displayed in the Logical Root Sequence Index (Incremented) field.
Physical Root Sequence Index, Cyclic Shift v and Incremented Logical Root Sequence Index are automatically changed on GUI based on Cyclic Shift Set, Ncs Configuration, Logical Root Sequence Index and Preamble Index.
This parameter is read only and the value is automatically set by the software based on Logical Root Sequence Index , Preamble Index, Ncs Configuration, and Cyclic Shift Set. Refer to 34.141 A.6.
In the case where preambles corresponding to Preamble Index cannot be generated from a single root Zadoff-Chu sequence, Logical Root Sequence Index is incremented until corresponding Preamble sequences are found.
That incremented Logical Root Sequence Index is displayed in the Logical Root Sequence Index (Incremented) field.
Physical Root Sequence Index, Cyclic Shift v and Incremented Logical Root Sequence Index are automatically changed on GUI based on Cyclic Shift Set, Ncs Configuration, Logical Root Sequence Index and Preamble Index.
| Test preambles for Normal Mode | |||
| Burst Format | Ncs value | Logical Root Sequence Index | Cycle Shift v |
| 0 | 13 | 22 | 32 |
| 1 | 167 | 22 | 2 |
| 2 | 167 | 22 | 0 |
| 3 | 0 | 22 | 0 |
| 4 | 10 | 0 | 0 |
| Test preambles for High Speed Mode | |||
| Burst Format | Ncs value | Logical Root Sequence Index | Cycle Shift v |
| 0 | 15 | 384 | 0 |
| 1 | 202 | 384 | 0 |
| 2 | 202 | 384 | 0 |
| 3 | 237 | 384 | 0 |
Refer to Preamble Index-related information in TS36.212 5.3.3.1.3, TS36.321 5.1, and TS36.331 6.3.2.
Choice: On | Off
Default: On
Double-click or use the drop-down menu to turn the Increase Time Offset on or off.
When the Increase Time Offset is turned on, the Preamble Time Offset in each preamble is increased by adding in each step a value of 0.1 (us).
This parameter is visible when the Auto-configuration is set to PRACH Test Preamble (36.141). Otherwise it’s hidden.
When this parameter is off or the Auto-configuration is set to RA Configuration, the Preamble Time Offset in each preamble is set to zero.
See 3GPP TS 36.141 for more information.
Choice: On | Off
Default: On
When the Auto-configuration is PRACH Test Preambles (36.141), double-click or use the drop-down menu to turn the Time Offset Base State on or off. Otherwise it’s hidden.
When the Time Offset Base State is on, the Timing Offset in the component carrier node is set to the Time Offset Base Value. Otherwise it's not set.
Choice: On | Off
Default: On
When the Auto-Configuration is PRACH Test Preambles (36.141), displays the Time Offset Base Value. Otherwise it’s hidden.
When the Time Offset Base State is on, the Timing Offset in the component carrier node is set to the Time Offset Base Value. Otherwise it's not set.
The Time Offset Base Value depends on the Preamble Format and Cyclic Shift Set (High-speed flag).
See 3GPP TS 36.211 and 36.141 for more information.