Transcript IEEE C802.16m-10/0018

Subchannelization for supporting Open-Loop Region Types 0 and 1
IEEE 802.16 Presentation Submission Template (Rev. 9)
Document Number:
IEEE C80216m-10/0018
Date Submitted:
2010-01-11
Source:
David Mazzarese, Taeyoung Kim, Sudhir Ramakrishna
Heewon Kang, Hokyu Choi
Samsung Electronics
[email protected]
Venue:
IEEE 802.16m Session#65, San Diego, US
Re:IEEE 802.16m-09/0058r4: Letter Ballot Recirc #30b
Base Contribution:
IEEE C80216m-09/2942
Purpose:
Discussion and approval
Notice:
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1
Support of Open-Loop Regions
with Distributed Allocations
• OL region type 0 in DLRUs
– DLRUs must be aligned across cells in FP0
• OL region type 1 in NLRUs (minibands)
– NLRUs must be aligned across cells in FP0
• Problem in D3
– Cell-specific CRU/DRU allocation (eq 194 in D3)
results in unavoidable collisions of DLRUs in one cell
with NLRUs in another cell
2
DL Subchannelization (D3, Eq 194)
1
2
3
4
5
6
7
8
9
10
11
12 13
14
15
16 17
18
19
…
0
Subband
PRU
IndexPRU
28
29
30 31
32
33
34 35
36
37 38
39
40 41
42
43
44 45
46
47
18 19
20
21
22 23
24
25 26
27
28 29
30
31
32 33
34
35
25 26
27
28 29
30
31
32 33
34
35
2
4
5
4
5
Subband Partitioning
Multi-cell
…
0 1
2 3
Reordered index:
4
5
6
7
8
9
10 11
0
1
2
3
4
5
6
7
18
17
Mapping
Miniband Permutation
…
0
1
2
3
4
5
6
7
8
9
10 11
0
1
2
3
4
5
6
7
18
17
18 19
20
21
2
3
22 23
24
Frequency Partitioning
Cell-specific
2
3
4
5
6
7
8
9
10 11
12
13 14
15
2
3
4
Mapping
5
6
18
19
28
29 0 1
PRUFP1
DRUFP,0
7
8
9
10 11
0
Mapping
1
2
3
12
4
5
0 1
PRUFP2
CRU/DRU
allocation
cell-specific
miniband permutation
CRUFP,0
1
17
CRU/DRU
A allocation
type of
Direct mapping
0
16
…
1
…
16
17
Subcarrier-permutation
0
1
0
1
3
4
5 0 1
PRUFP3
CRU/DRU
allocation
DRUFP,1
13 14 15
2
CRU/DRU
allocation
DRUFP,2
2
3
0
1
2
3
3
DRUFP,3
4
5
0
1
2
3
Subcarrierpermutation
Subcarrierpermutation
Subcarrierpermutation
Freq. partition 2
Freq. partition 3
Freq. partition 4
…
CRU/DRU
allocation
partition 0
0
PRUFP0
IndexLRU
Freq. partition 1
Freq. reuse-3
Freq. reuse-1
: Subband-based CRU
: Miniband-based CRU
: DRU
3
3
Cell-specific CRU/DRU allocation
• Purpose of cell-specific CRU/DRU allocation (eq 194 in D3)
– When subbands are taken from cell-common subbands for
use in NLRU, PRUs must be permuted for frequency diversity.
– This also provides interference randomization in the NLRU
• Problem with OL regions type 0-DLRU and 1-NLRU
– The physical PRUs assigned to NLRU and DLRU are not
aligned across cells because of the cell-specific CRU/DRU
allocation (equation 194 in D3)
– Even if the numbers of subbands (SLRU) and minibands
(NLRU) are equal in frequency partition 0 across all cells
4
Proposal in C802.16m-09/C2942
1
2
3
4
5
6
7
8
9
10
11
12 13
14
15
16 17
18
19
…
0
Subband
PRU
IndexPRU
28
29
30 31
32
33
34 35
36
37 38
39
40 41
42
43
44 45
46
47
18 19
20
21
22 23
24
25 26
27
28 29
30
31
32 33
34
35
25 26
27
28 29
30
31
32 33
34
35
2
4
5
4
5
Subband Partitioning
Multi-cell
…
0 1
2 3
Reordered index:
4
5
6
7
8
9
10 11
0
1
2
3
4
5
6
7
18
17
Mapping
Miniband Permutation
…
0
1
2
3
4
5
6
7
8
9
10 11
0
1
2
3
4
5
6
7
18
17
18 19
20
21
2
3
22 23
24
Frequency Partitioning
Cell-specific
2
3
4
5
6
7
8
9
10 11
12
13 14
15
2
3
4
Mapping
5
6
18
19
28
29 0 1
PRUFP1
4
5
0 1
PRUFP2
CRU/DRU
allocation
2
3
4
5 0 1
PRUFP3
CRU/DRU
allocation
3
CRU/DRU
allocation
miniband permutation
CRUFP,0
1
17
1 CRU/DRU
SFH bit:
cell specific or common
allocation
Direct mapping
0
16
…
1
…
DRUFP,0
7
8
9
10 11
0
Mapping
1
2
3
12
DRUFP,1
13 14 15
16
17
Subcarrier-permutation
0
1
0
1
DRUFP,2
2
3
0
1
2
3
DRUFP,3
4
5
0
1
2
3
Subcarrierpermutation
Subcarrierpermutation
Subcarrierpermutation
Freq. partition 2
Freq. partition 3
Freq. partition 4
…
CRU/DRU
allocation
partition 0
0
PRUFP0
IndexLRU
Freq. partition 1
Freq. reuse-3
Freq. reuse-1
: Subband-based CRU
: Miniband-based CRU
: DRU
5
5
Proposal in C802.16m-09/C2728r1
6
Analysis
• C802.16m-09/C2942
– Cell-specific or common permutation configured in SFH by ABS
– No difference with D3 when there is no OL region type 0 or 1
– Only drawback: loss of interference randomization in NLRUs in
FP0 when OL region type 0-DLRU is present
– So we recommend no NLRU in FP0 when OL region type 0 is
present, or to have OL regions types 0 and 1 simultaneously
• C802.16m-09/C2728r1
– Change to D3 results in loss of frequency diversity in NLRUs in
FP0 even when OL region is not present
– Feature of 16m to dynamically adjust the SLRU/NLRU resources
is basically made useless by this change of permutation
– Loss of frequency diversity in NLRUs defeats the purpose of
minibands
7
Conclusion
• Recommend to adopt the text proposal in
C802.16m-09/C2942 or its latest revision.
8