US 8,559,355 B2 · Method for configuring and indicating physical random access channel PRACH parameters in a time division duplex system

Abstract

The present invention discloses a method for configuring and indicating physical random access channel parameter in a time division duplex system, suitable for the long term evolution, system, including: the same PRACH configuration set is stored in a base station and a terminal respectively; when performing a PRACH configuration, the terminal inquires the PRACH configuration set according to configuration information to obtain a configuration parameter, and/or the terminal computes to obtain the configuration parameter according to a system parameter. Set by using the method provided by the present invention, the PRACH configuration set can provide enough density types for various PRACH formats in order to meet the requirements of different system loads, and meanwhile can provide enough version types for each combination of format and density, decrease the processing load of the base station, and reduce the inter-cell interference.

A method for configuring and indicating Physical Random Access Channel, PRACH, parameter in a Time Division Duplex system, suitable for the Long Term Evolution, LTE, system, wherein a same PRACH configuration set is stored in a base station and a terminal respectively;

when performing a PRACH configuration, the terminal inquires the PRACH configuration set according to configuration information to obtain a configuration parameter, and/or the terminal computes to obtain the configuration parameter according to a system parameter;
wherein the configuration parameter of the PRACH includes one or more of the following:
density, PRACH format, and version number;
wherein the terminal computing to obtain the configuration parameter according to the system parameter computation refers to the terminal obtaining a version number according to the system parameter, comprising:
the terminal computes the number of versions according to the following formula:
R
=
⌊
N
RA
BW
·
N
SP
D
⌋
,
wherein R is the number of versions, NRABW is the number of the PRACHs supported by the system in frequency domain, NSP is the number of switch points within 10 ms, and D is the density of the PRACHs;
the terminal computes the version number according to the following formula:
r=NIDcell mod R, wherein NIDcell represents the ID value of the cell, and R is the number of versions;
wherein the configuration set is one of the following sets:
Configuration
Preamble
Version
Index
Format
Density(D)
Number(r)
0
0
0.5
0
1
0
0.5
1
2
0
0.5
2
3
0
1
0
4
0
1
1
5
0
1
2
6
0
2
0
7
0
2
1
8
0
2
2
9
0
3
0
10
0
3
1
11
0
3
2
12
0
5
0
13
0
5
1
14
0
5
2
15
0
10
0
16
0
10
1
17
0
10
2
18
1
0.5
0
19
1
0.5
1
20
1
0.5
2
21
1
1
0
22
1
1
1
23
1
2
0
24
1
3
0
25
1
3
1
26
1
5
0
27
1
5
1
28
2
0.5
0
29
2
0.5
1
30
2
0.5
2
31
2
1
0
32
2
1
1
33
2
2
0
34
2
3
0
35
2
3
1
36
2
5
0
37
2
5
1
38
3
0.5
0
39
3
0.5
1
40
3
0.5
2
41
3
1
0
42
3
1
1
43
3
2
0
44
3
3
0
45
3
3
1
46
4
0.5
\
47
4
1
\
48
4
2
\
49
4
3
\
50
4
5
\
51
4
10
\
52
53
54
55
56
57
58
59
60
61
62
63,
0
0
0.5
0
1
0
0.5
1
2
0
0.5
2
3
0
1
0
4
0
1
1
5
0
1
2
6
0
2
0
7
0
2
1
8
0
2
2
9
0
3
0
10
0
3
1
11
0
3
2
12
0
5
0
13
0
5
1
14
0
5
2
15
1
0.5
0
16
1
0.5
1
17
1
0.5
2
18
1
1
0
19
1
1
1
20
1
2
0
21
1
3
0
22
1
3
1
23
2
0.5
0
24
2
0.5
1
25
2
0.5
2
26
2
1
0
27
2
1
1
28
2
2
0
29
2
3
0
30
2
3
1
31
3
0.5
0
32
3
0.5
1
33
3
0.5
2
34
3
1
0
35
3
1
1
36
3
2
0
37
4
0.5
\
38
4
1
\
39
4
2
\
40
4
3
\
41
4
5
\
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63,
0
0
0.5
0
1
0
0.5
1
2
0
0.5
2
3
0
1
0
4
0
1
1
5
0
1
2
6
0
2
0
7
0
2
1
8
0
2
2
9
0
3
0
10
0
3
1
11
0
3
2
12
0
5
0
13
0
5
1
14
0
5
2
15
1
0.5
0
16
1
0.5
1
17
1
0.5
2
18
1
1
0
19
1
1
1
20
1
2
0
21
1
3
0
22
1
3
1
23
2
0.5
0
24
2
0.5
1
25
2
0.5
2
26
2
1
0
27
2
1
1
28
2
2
0
29
2
3
0
30
2
3
1
31
2
5
0
32
2
5
1
33
3
0.5
0
34
3
0.5
1
35
3
0.5
2
36
3
1
0
37
3
1
1
38
4
0.5
\
39
4
1
\
40
4
2
\
41
4
3
\
42
4
5
\
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63,
0
0
0.5
0
1
0
0.5
1
2
0
0.5
2
3
0
1
0
4
0
1
1
5
0
1
2
6
0
2
0
7
0
2
1
8
0
2
2
9
0
3
0
10
0
3
1
11
0
3
2
12
0
5
0
13
0
5
1
14
0
5
2
15
1
0.5
0
16
1
0.5
1
17
1
0.5
2
18
1
1
0
19
1
1
1
20
1
1
2
21
1
2
0
22
1
2
1
23
1
2
2
24
1
3
0
25
1
3
1
26
1
3
2
27
1
5
0
28
1
5
1
29
1
5
2
30
2
0.5
0
31
2
0.5
1
32
2
0.5
2
33
2
1
0
34
2
1
1
35
2
1
2
36
2
2
0
37
2
2
1
38
2
2
2
39
2
3
0
40
2
3
1
41
2
3
2
42
2
5
0
43
2
5
1
44
2
5
2
45
3
0.5
0
46
3
0.5
1
47
3
0.5
2
48
3
1
0
49
3
1
1
50
3
1
2
51
3
2
0
52
3
2
1
53
3
2
2
54
3
3
0
55
3
3
1
56
3
3
2
57
4
0.5
\
58
4
1
\
59
4
2
\
60
4
3
\
61
4
5
\
62
4
10
\
63,
0
0
0.5
0
1
0
0.5
1
2
0
0.5
2
3
0
1
0
4
0
1
1
5
0
1
2
6
0
2
0
7
0
2
1
8
0
2
2
9
0
3
0
10
0
3
1
11
0
3
2
12
0
5
0
13
0
5
1
14
0
5
2
15
1
0.5
0
16
1
0.5
1
17
1
0.5
2
18
1
1
0
19
1
1
1
20
1
2
0
21
1
3
0
22
1
3
1
23
2
0.5
0
24
2
0.5
1
25
2
0.5
2
26
2
1
0
27
2
1
1
28
2
2
0
29
2
3
0
30
2
3
1
31
2
5
0
32
2
5
1
33
3
0.5
0
34
3
0.5
1
35
3
0.5
2
36
3
1
0
37
3
1
1
38
3
2
0
39
3
3
0
40
3
3
1
41
4
0.5
\
42
4
1
\
43
4
2
\
44
4
3
\
45
4
5
\
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63,
0
0
0.5
0
1
0
0.5
1
2
0
0.5
2
3
0
1
0
4
0
1
1
5
0
1
2
6
0
2
0
7
0
2
1
8
0
2
2
9
0
3
0
10
0
3
1
11
0
3
2
12
0
5
0
13
0
5
1
14
0
5
2
15
1
0.5
0
16
1
0.5
1
17
1
0.5
2
18
1
1
0
19
1
1
1
20
1
1
2
21
1
2
0
22
1
2
1
23
1
2
2
24
1
3
0
25
1
3
1
26
1
3
2
27
2
0.5
0
28
2
0.5
1
29
2
0.5
2
30
2
1
0
31
2
1
1
32
2
1
2
33
2
2
0
34
2
2
1
35
2
2
2
36
2
3
0
37
2
3
1
38
2
3
2
39
2
5
0
40
2
5
1
41
2
5
2
42
3
0.5
0
43
3
0.5
1
44
3
0.5
2
45
3
1
0
46
3
1
1
47
3
1
2
48
3
2
0
49
3
2
1
50
3
2
2
51
3
3
0
52
3
3
1
53
3
3
2
54
4
0.5
\
55
4
1
\
56
4
2
\
57
4
3
\
58
4
5
\
59
60
61
62
63,
0
0
0.5
0
1
0
0.5
1
2
0
0.5
2
3
0
0.5
3
4
0
1
0
5
0
1
1
6
0
1
2
7
0
2
0
8
0
2
1
9
0
2
2
10
0
3
0
11
0
3
1
12
0
3
2
13
0
5
0
14
0
5
1
15
0
5
2
16
0
10
0
17
0
10
1
18
0
10
2
19
1
0.5
0
20
1
0.5
1
21
1
0.5
2
22
1
0.5
3
23
1
1
0
24
1
1
1
25
1
2
0
26
1
3
0
27
1
3
1
28
1
5
0
29
1
5
1
30
2
.5
0
31
2
.5
1
32
2
0.5
2
33
2
0.5
3
34
2
1
0
35
2
1
1
36
2
2
0
37
2
3
0
38
2
3
1
39
2
5
0
40
2
5
1
41
3
0.5
0
42
3
0.5
1
43
3
0.5
2
44
3
0.5
3
45
3
1
0
46
3
1
1
47
3
2
0
48
3
3
0
49
3
3
1
50
4
0.5
\
51
4
1
\
52
4
2
\
53
4
3
\
54
4
5
\
55
4
10
\
56
57
58
59
60
61
62
63,
0
0
0.5
0
1
0
0.5
1
2
0
0.5
2
3
0
1
0
4
0
1
1
5
0
1
2
6
0
2
0
7
0
2
1
8
0
2
2
9
0
3
0
10
0
3
1
11
0
3
2
12
0
4
0
13
0
4
1
14
0
4
2
15
0
5
0
16
0
5
1
17
0
5
2
18
0
6
0
19
0
6
1
20
0
10
0
21
0
10
1
22
0
10
2
23
1
0.5
0
24
1
0.5
1
25
1
0.5
2
26
1
1
0
27
1
1
1
28
1
2
0
29
1
3
0
30
1
4
0
31
1
5
0
32
1
6
0
33
2
0.5
0
34
2
0.5
1
35
2
0.5
2
36
2
1
0
37
2
1
1
38
2
2
0
39
2
3
0
40
2
4
0
41
2
5
0
42
2
6
0
43
3
0.5
0
44
3
0.5
1
45
3
0.5
2
46
3
1
0
47
3
1
1
48
3
2
0
49
3
3
0
50
3
4
0
51
4
0.5
\
52
4
1
\
53
4
2
\
54
4
3
\
55
4
4
\
56
4
5
\
57
4
6
\
58
4
10
\
59
60
61
62
63,
0
0
0.5
0
1
0
0.5
1
2
0
0.5
2
3
0
1
0
4
0
1
1
5
0
1
2
6
0
2
0
7
0
2
1
8
0
2
2
9
0
3
0
10
0
3
1
11
0
3
2
12
0
4
0
13
0
4
1
14
0
4
2
15
0
5
0
16
0
5
1
17
0
5
2
18
0
6
0
19
0
6
1
20
1
0.5
0
21
1
0.5
1
22
1
0.5
2
23
1
1
0
24
1
1
1
25
1
2
0
26
1
3
0
27
1
4
0
28
1
5
0
29
1
6
0
30
2
0.5
0
31
2
0.5
1
32
2
0.5
2
33
2
1
0
34
2
1
1
35
2
2
0
36
2
3
0
37
2
4
0
38
2
5
0
39
2
6
0
40
3
0.5
0
41
3
0.5
1
42
3
0.5
2
43
3
1
0
44
3
1
1
45
3
2
0
46
3
3
0
47
3
4
0
48
4
0.5
\
49
4
1
\
50
4
2
\
51
4
3
\
52
4
4
\
53
4
5
\
54
4
6
\
55
56
57
58
59
60
61
62
63,
0
0
0.5
0
1
0
0.5
1
2
0
0.5
2
3
0
1
0
4
0
1
1
5
0
1
2
6
0
2
0
7
0
2
1
8
0
2
2
9
0
4
0
10
0
4
1
11
0
4
2
12
0
6
0
13
0
6
1
14
0
6
2
15
0
10
0
16
0
10
1
17
0
10
2
18
1
0.5
0
19
1
0.5
1
20
1
0.5
2
21
1
1
0
22
1
1
1
23
1
2
0
24
1
4
0
25
1
6
0
26
2
0.5
0
27
2
0.5
1
28
2
0.5
2
29
2
1
0
30
2
1
1
31
2
2
0
32
2
4
0
33
2
6
0
34
3
0.5
0
35
3
0.5
1
36
3
0.5
2
37
3
1
0
38
3
1
1
39
3
2
0
40
3
4
0
41
4
0.5
0
42
4
0.5
1
43
4
0.5
2
44
4
1
0
45
4
1
1
46
4
2
0
47
4
4
0
48
4
6
0
49
4
10
0
50
51
52
53
54
55
56
57
58
59
60
61
62
63,
0
0
0.5
0
1
0
0.5
1
2
0
0.5
2
3
0
1
0
4
0
1
1
5
0
1
2
6
0
2
0
7
0
2
1
8
0
2
2
9
0
4
0
10
0
4
1
11
0
4
2
12
0
6
0
13
0
6
1
14
0
6
2
15
0
10
0
16
0
10
1
17
0
10
2
18
1
0.5
0
19
1
0.5
1
20
1
0.5
2
21
1
1
0
22
1
1
1
23
1
2
0
24
1
4
0
25
1
6
0
26
2
0.5
0
27
2
0.5
1
28
2
0.5
2
29
2
1
0
30
2
1
1
31
2
2
0
32
2
4
0
33
2
6
0
34
3
0.5
0
35
3
0.5
1
36
3
0.5
2
37
3
1
0
38
3
1
1
39
3
2
0
40
3
4
0
41
4
0.5
0
42
4
0.5
1
43
4
0.5
2
44
4
1
0
45
4
1
1
46
4
1
2
47
4
2
0
48
4
2
1
49
4
2
2
50
4
4
0
51
4
4
1
52
4
4
2
53
4
6
0
54
4
6
1
55
4
6
2
56
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63.

4,696 more elements

Method for configuring and indicating physical random access channel PRACH parameters in a time division duplex system

Life of this patent

Method for configuring and indicating physical random access channel PRACH parameters in a time division duplex system

Life of this patent

Abstract

Claims13