IEEE C802.16m-09/0272
Project
IEEE 802.16 Broadband Wireless Access Working Group <http://ieee802.org/16>
Title
Synchronization Channel for IEEE 802.16m Amendment
Date
Submitted
2009-01-07
Source(s)
Pei-Kai Liao, Yu-Hao Chang, Chih-Yuan
Lin, Ciou-Ping Wu, Paul Cheng
pk.liao@mediatek.com
yuhao.chang@mediatek.com
paul.cheng@mediatek.com
MediaTek Inc.
Re:
IEEE 802.16m-08/053r1, “Call for Comments and Contributions on Project 802.16m
Amendment Working Document”.
- DL PHY control structure
Abstract
This contribution proposes SCH text proposal for P802.16m SDD.
Purpose
Propose to be discussed and adopted by TGm for the use in Project 802.16m SDD.
Notice
Release
Patent
Policy
This document does not represent the agreed views of the IEEE 802.16 Working Group or any of its subgroups. It
represents only the views of the participants listed in the “Source(s)” field above. It is offered as a basis for
discussion. It is not binding on the contributor(s), who reserve(s) the right to add, amend or withdraw material
contained herein.
The contributor grants a free, irrevocable license to the IEEE to incorporate material contained in this contribution,
and any modifications thereof, in the creation of an IEEE Standards publication; to copyright in the IEEE’s name
any IEEE Standards publication even though it may include portions of this contribution; and at the IEEE’s sole
discretion to permit others to reproduce in whole or in part the resulting IEEE Standards publication. The
contributor also acknowledges and accepts that this contribution may be made public by IEEE 802.16.
The contributor is familiar with the IEEE-SA Patent Policy and Procedures:
<http://standards.ieee.org/guides/bylaws/sect6-7.html#6> and
<http://standards.ieee.org/guides/opman/sect6.html#6.3>.
Further information is located at <http://standards.ieee.org/board/pat/pat-material.html> and
<http://standards.ieee.org/board/pat>.
1
IEEE C802.16m-09/0272
Synchronization Channel for IEEE 802.16m Amendment
Pei-Kai Liao, Yu-Hao Chang, Chih-Yuan Lin, Ciou-Ping Wu, Paul Cheng
MediaTek Inc.
I.
Introduction
This contribution is to propose text proposal to synchronization channel section for IEEE 802.16m
Amendment.
II. Proposed Synchronization Channel Architecture
There are two synchronization channel (SCH) types in the proposed SCH architecture — Primary
synchronization channel (P-SCH) and Secondary synchronization channel (S-SCH). P-SCH is responsible for
superframe timing / radio frame timing / OFDM symbol boundary synchronization and signaling some system
information such as channel bandwidth and sector information. Following two figures illustrates the proposed
SCH architecture for 16m-only mode and legacy support mode.
802.16m Super-frame
802.16m Frame
802.16m Subrame
FDD Mode
D D D D D D D
D D D D D D D
D D D D D D D
D D D D D D D
TDD Mode
D D D D U U U
D D D D U U U
D D D D U U U
D D D D U U U
Ts = 102.857μs
P-SCH
Duplicate
1/2Tu=45.7145 μs
S-SCH
CP
Tg
1/2Tu=45.7145 μs
Frequency Domain
Figure 1 SCH architecture for 16m-only mode
2
Idle Time
16m SCH Symbol
IEEE C802.16m-09/0272
Legacy Radio Frame
IEEE 802.16m Superframe
IEEE 802.16m Radio Frame
D
FDD Mode
TDD Mode
D
D
D
Frame Offset
D D D D D D D
D D D D D D D
D D D D D D D
D D D D D D D
D
D
D
D
U
U
U
U
Frame Offset
D D D U U U D
D D D U U U D
D D D U U U D
D D D U U U D
SCH Symbol of
Legacy System
Idle Time
SCH Symbol of
IEEE 802.16m
Figure 2 SCH architecture for legacy support mode
III. Text Proposal
---------------------------------------------------------Start of the Text----------------------------------------------------------[Add the following into the TGm Amendment Document]
15.3.7.2.1 Synchronization Channel (SCH)
The synchronization channel (SCH) is a DL physical channel which provides a reference signal for time,
frequency, and frame synchronization, RSSI estimation, channel estimation, and BS identification.
Two levels of synchronization hierarchy exist. These are called the primary synchronization channel (P-SCH)
and secondary synchronization channel (S-SCH).
The P-SCH transmits one of [10] unique identifications to support the acquisition of physical cell/sector
identifications transmitted in S-SCH.
The S-SCH transmits one of [520] complete physical cell/sector identifications.
There are 4 OFDM symbols located every 5 ms for P-/S-SCH in a single superframe and the P-SCH and S-SCH
shall share one OFDM symbol in time length as shown in Figure X-1. P-SCH and S-SCH are multiplexed by
TDM inside the OFDM symbol. Each pair of P-SCH and S-SCH is located in the first DL subframe of the frame
and occupies the 1st symbol position within a subframe.
3
IEEE C802.16m-09/0272
Advanced Air Interface Superframe
Advanced Air Interface Frame
Advanced Air Interface Subrame
FDD Mode
D D D D D D D
D D D D D D D
D D D D D D D
D D D D D D D
TDD Mode
D D D D U U U
D D D D U U U
D D D D U U U
D D D D U U U
Ts
P-SCH
Duplicate
S-SCH
CP
Idle Time
1/2Tb
Tg
Advanced Air Interface SCH
1/2Tb
Figure X-1 Advanced Air Interface SCH Architecture
15.3.7.2.1.1 Primary Synchronization Channel (P-SCH)
In P-SCH, frequency reuse 1 shall be applied. The time length of P-SCH is 1 Tb and the occupied channel
2
bandwidth is 5 MHz. The P-SCH is used for initial acquisition, superframe synchronization, channel estimation,
and sending additional information.
15.3.7.2.1.1.1 P-SCH Modulation Series
The length of each P-SCH modulation series is [97]. The modulation and power boosting of P-SCH is FFS. The
P-SCH series depends on the sector information, system bandwidth, and carrier information.
The series (Wk) used for the P-SCH modulation is defined in Table X-1. Table X-1 includes a set of series in a
hexadecimal format. The value of the P-SCH modulation series is obtained by converting the series (Wk) to a
binary sequence and mapping the converted sequence starting from the MSB of each symbol to the LSB. (0
mapped to +1 and 1 mapped to –1. For example, Wk = 110000010010..., and the mapping shall follow: –1 –1 +1
+1 +1 +1 +1 –1 +1 +1 –1 +1 ...)
The equation (X-1) defines the mapping rule of the sector information, system bandwidth, and carrier
information into P-SCH index, IDPSCH as follows:
 3  N BW , if NCarrier  0
N
,
IDP  SCH   Sector
, if NCarrier  1
9
(X-1)
where
4
IEEE C802.16m-09/0272
-
N Sector denotes the sector index with 0, 1, and 2.
N BW denotes the bandwidth indication with 0, 1, and 2, and thus, the indices 0, 1, and 2 represent 512FFT, 1024-FFT, and 2048-FFT, respectively.
N Carrier represents the carrier type whether this carrier is a fully-configured carrier, i.e., N Carrier  0 , or
a partially-configure carrier, i.e., N Carrier  1 .
Table X-1 P-SCH modulation series [TBD]
IDPSCH
Series to modulate (Wk)
0
1
2
3
4
5
6
7
8
9
…
…
…
…
…
…
…
…
…
…
15.3.7.2.1.1.2 Transmission of P-SCH Series
The subcarrier spacing of P-SCH is four times larger than that of a regular data OFDM symbol. Each subcarrier
is modulated using a boosted BPSK modulation with a specific series defined in 15.3.7.2.1.1.1. After inverse
FFT, the time domain samples are duplicated into two copies to form one P-SCH. In other words, the P-SCH in
the time domain has two repeated waveform.
In regular frame header, the subcarrier modulation for P-SCH is provided by the following equation (X-2)
Subcarrier ( x) P  SCH
Wk ( x  offset  97), if x  offset  4 and x  offset  1
W ( x  offset ), if x  offset and x  offset  48
 k
 Wk ( x  offset  1), if x  offset  50 and x  offset  97 ,
W ( x  offset  98), if x  offset  98 and x  offset  101
 k
nulled, otherwise
(X-2)
where Subcarrier(x)P-SCH represents the subcarrier with running index x and Wk(l) represents the lth digit of the
modulated P-SCH series. x ranges from 0 to 127 and offset is equal to 15 for the channel bandwidth of 5 MHz; x
ranges from 0 to 255 and offset is equal to 79 for the channel bandwidth of 7, 8.75 and 10 MHz; x ranges from 0
to 511 and offset is equal to 207 for the channel bandwidth of 20 MHz. Figure X-2 illustrates an example of PSCH frequency domain structure in regular frame header for channel bandwidths of 5, 10 and 20 MHz.
5
IEEE C802.16m-09/0272
DC Tone
0
128
192 203
256
308 319
383
511
49 subcarriers 48 subcarriers
1st Part
128 subcarriers
2nd Part
64 subcarriers
11 subcarriers
64 subcarriers
5 MHz
128 subcarriers
11 subcarriers
1 subcarrier
4 subcarriers
10 MHz
4 subcarriers
20 MHz
Figure X-2 Example of P-SCH Frequency Domain Structure in Regular Frame Header
In superframe header, the subcarrier modulation for P-SCH is provided by the following equation (X-3)
Subcarrier ( x) P  SCH
 Wk ( x  offset  4), if x  offset  4 and x  offset  1
 W ( x  offset  48), if x  offset and x  offset  48
 k
 Wk ( x  offset  50), if x  offset  50 and x  offset  97
 W ( x  offset  5), if x  offset  98 and x  offset  101
 k
nulled, otherwise
(X-3)
,
where Subcarrier(x)P-SCH represents the subcarrier with running index x and Wk(l) represents the lth digit of the
modulated P-SCH series. x ranges from 0 to 127 and offset is equal to 15 for the channel bandwidth of 5 MHz; x
ranges from 0 to 255 and offset is equal to 79 for the channel bandwidth of 7, 8.75 and 10 MHz; x ranges from 0
to 511 and offset is equal to 207 for the channel bandwidth of 20 MHz. Figure X-3 illustrates an example of PSCH frequency domain structure in superframe header for channel bandwidths of 5, 10 and 20 MHz.
6
IEEE C802.16m-09/0272
DC Tone
0
128
192 203
256
308 319
383
511
49 subcarriers 48 subcarriers
2nd Part
128 subcarriers
1st Part
64 subcarriers
11 subcarriers
64 subcarriers
5 MHz
128 subcarriers
11 subcarriers
1 subcarrier
4 subcarriers
10 MHz
4 subcarriers
20 MHz
Figure X-3 Example of P-SCH Frequency Domain Structure in Superframe Header
15.3.7.2.1.2 Secondary Synchronization Channel (S-SCH)
In S-SCH, frequency reuse 3 shall be applied. The time length of S-SCH is Tg  1 Tb and S-SCH occupies full
2
bandwidth. The S-SCH is used for fine synchronization, RSSI measurement, and cell/sector identification (ID).
15.3.7.2.1.2.1 S-SCH Modulation Series
The length of each S-SCH modulation series is [67] for any channel bandwidth. Full cell ID information shall be
carried inside the minimal supported channel bandwidth – 5 MHz. The modulation and power boosting of SSCH is FFS.
The S-SCH series modulating the subcarriers is generated from Zadoff-Chu sequences with parameters u and S
defined in Table X-2.1~2.4, where Table X-2.4 is for femtocells only.
Table X-2.1 S-SCH modulation series [FFS]
Cell ID Segment
0
0
1
1
2
2
3
0
u
1
1
1
1
S
0
5
10
15
Cell ID Segment
60
0
61
1
62
2
63
0
7
u
9
9
9
9
S
0
5
10
15
Cell ID Segment
120
0
121
1
122
2
123
0
u
17
17
17
17
S
0
5
10
15
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
1
2
0
1
2
0
1
2
0
1
2
0
1
2
0
1
2
0
1
2
0
1
2
0
1
2
0
1
2
0
1
2
0
1
2
0
1
2
0
1
1
1
1
1
1
1
1
1
2
2
2
2
2
2
2
2
2
2
2
2
3
3
3
3
3
3
3
3
3
3
3
3
4
4
4
4
4
4
4
4
20
25
30
35
40
45
50
55
0
5
10
15
20
25
30
35
40
45
50
55
0
5
10
15
20
25
30
35
40
45
50
55
0
5
10
15
20
25
30
35
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
1
2
0
1
2
0
1
2
0
1
2
0
1
2
0
1
2
0
1
2
0
1
2
0
1
2
0
1
2
0
1
2
0
1
2
0
1
2
0
1
9
9
9
9
9
9
9
9
10
10
10
10
10
10
10
10
10
10
10
10
12
12
12
12
12
12
12
12
12
12
12
12
14
14
14
14
14
14
14
14
8
20
25
30
35
40
45
50
55
0
5
10
15
20
25
30
35
40
45
50
55
0
5
10
15
20
25
30
35
40
45
50
55
0
5
10
15
20
25
30
35
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
IEEE C802.16m-09/0272
1
17
20
2
17
25
0
17
30
1
17
35
2
17
40
0
17
45
1
17
50
2
17
55
0
18
0
1
18
5
2
18
10
0
18
15
1
18
20
2
18
25
0
18
30
1
18
35
2
18
40
0
18
45
1
18
50
2
18
55
0
21
0
1
21
5
2
21
10
0
21
15
1
21
20
2
21
25
0
21
30
1
21
35
2
21
40
0
21
45
1
21
50
2
21
55
0
22
0
1
22
5
2
22
10
0
22
15
1
22
20
2
22
25
0
22
30
1
22
35
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
2
0
1
2
0
1
2
0
1
2
0
1
2
0
1
2
4
4
4
4
7
7
7
7
7
7
7
7
7
7
7
7
40
45
50
55
0
5
10
15
20
25
30
35
40
45
50
55
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
2
0
1
2
0
1
2
0
1
2
0
1
2
0
1
2
14
14
14
14
16
16
16
16
16
16
16
16
16
16
16
16
40
45
50
55
0
5
10
15
20
25
30
35
40
45
50
55
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
IEEE C802.16m-09/0272
2
22
40
0
22
45
1
22
50
2
22
55
0
24
0
1
24
5
2
24
10
0
24
15
1
24
20
2
24
25
0
24
30
1
24
35
2
24
40
0
24
45
1
24
50
2
24
55
Table X-2.2 S-SCH modulation series [FFS]
Cell ID Segment
180
0
181
1
182
2
183
0
184
1
185
2
186
0
187
1
188
2
189
0
190
1
191
2
192
0
193
1
194
2
195
0
196
1
197
2
198
0
199
1
u
26
26
26
26
26
26
26
26
26
26
26
26
28
28
28
28
28
28
28
28
S
0
5
10
15
20
25
30
35
40
45
50
55
0
5
10
15
20
25
30
35
Cell ID Segment
240
0
241
1
242
2
243
0
244
1
245
2
246
0
247
1
248
2
249
0
250
1
251
2
252
0
253
1
254
2
255
0
256
1
257
2
258
0
259
1
9
u
34
34
34
34
34
34
34
34
34
34
34
34
35
35
35
35
35
35
35
35
S
0
5
10
15
20
25
30
35
40
45
50
55
0
5
10
15
20
25
30
35
Cell ID Segment
300
0
301
1
302
2
303
0
304
1
305
2
306
0
307
1
308
2
309
0
310
1
311
2
312
0
313
1
314
2
315
0
316
1
317
2
318
0
319
1
u
43
43
43
43
43
43
43
43
43
43
43
43
45
45
45
45
45
45
45
45
S
0
5
10
15
20
25
30
35
40
45
50
55
0
5
10
15
20
25
30
35
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
2
0
1
2
0
1
2
0
1
2
0
1
2
0
1
2
0
1
2
0
1
2
0
1
2
0
1
2
0
1
2
0
1
2
0
1
2
0
1
2
28
28
28
28
30
30
30
30
30
30
30
30
30
30
30
30
32
32
32
32
32
32
32
32
32
32
32
32
33
33
33
33
33
33
33
33
33
33
33
33
40
45
50
55
0
5
10
15
20
25
30
35
40
45
50
55
0
5
10
15
20
25
30
35
40
45
50
55
0
5
10
15
20
25
30
35
40
45
50
55
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
2
0
1
2
0
1
2
0
1
2
0
1
2
0
1
2
0
1
2
0
1
2
0
1
2
0
1
2
0
1
2
0
1
2
0
1
2
0
1
2
35
35
35
35
37
37
37
37
37
37
37
37
37
37
37
37
39
39
39
39
39
39
39
39
39
39
39
39
41
41
41
41
41
41
41
41
41
41
41
41
10
40
45
50
55
0
5
10
15
20
25
30
35
40
45
50
55
0
5
10
15
20
25
30
35
40
45
50
55
0
5
10
15
20
25
30
35
40
45
50
55
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
IEEE C802.16m-09/0272
2
45
40
0
45
45
1
45
50
2
45
55
0
46
0
1
46
5
2
46
10
0
46
15
1
46
20
2
46
25
0
46
30
1
46
35
2
46
40
0
46
45
1
46
50
2
46
55
0
49
0
1
49
5
2
49
10
0
49
15
1
49
20
2
49
25
0
49
30
1
49
35
2
49
40
0
49
45
1
49
50
2
49
55
0
50
0
1
50
5
2
50
10
0
50
15
1
50
20
2
50
25
0
50
30
1
50
35
2
50
40
0
50
45
1
50
50
2
50
55
IEEE C802.16m-09/0272
Table X-2.3 S-SCH modulation series [FFS]
Cell ID Segment
360
0
361
1
362
2
363
0
364
1
365
2
366
0
367
1
368
2
369
0
370
1
371
2
372
0
373
1
374
2
375
0
376
1
377
2
378
0
379
1
u
51
51
51
51
51
51
51
51
51
51
51
51
53
53
53
53
53
53
53
53
S
0
5
10
15
20
25
30
35
40
45
50
55
0
5
10
15
20
25
30
35
Cell ID Segment
380
2
381
0
382
1
383
2
384
0
385
1
386
2
387
0
388
1
389
2
390
0
391
1
392
2
393
0
394
1
395
2
396
0
397
1
398
2
399
0
u
53
53
53
53
55
55
55
55
55
55
55
55
55
55
55
55
57
57
57
57
S
40
45
50
55
0
5
10
15
20
25
30
35
40
45
50
55
0
5
10
15
Cell ID Segment
400
1
401
2
402
0
403
1
404
2
405
0
406
1
407
2
408
0
409
1
410
2
411
0
412
1
413
2
414
0
415
1
416
2
417
0
418
1
419
2
u
57
57
57
57
57
57
57
57
58
58
58
58
58
58
58
58
58
58
58
58
S
20
25
30
35
40
45
50
55
0
5
10
15
20
25
30
35
40
45
50
55
u
14
16
17
18
21
22
24
26
28
30
S
60
60
60
60
60
60
60
60
60
60
Table X-2.4 S-SCH modulation series for femtocells [FFS]
Cell ID Segment
420
0
421
1
422
2
423
0
424
1
425
2
426
0
427
1
428
2
429
0
u
60
60
60
60
60
60
60
60
60
60
S
0
5
10
15
20
25
30
35
40
45
Cell ID Segment
454
1
455
2
456
0
457
1
458
2
459
0
460
1
461
2
462
0
463
1
11
u
64
64
65
65
65
65
65
65
65
65
S
50
55
0
5
10
15
20
25
30
35
Cell ID Segment
488
2
489
0
490
1
491
2
492
0
493
1
494
2
495
0
496
1
497
2
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
1
2
0
1
2
0
1
2
0
1
2
0
1
2
0
1
2
0
1
2
0
1
2
0
60
60
63
63
63
63
63
63
63
63
63
63
63
63
64
64
64
64
64
64
64
64
64
64
50
55
0
5
10
15
20
25
30
35
40
45
50
55
0
5
10
15
20
25
30
35
40
45
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
2
0
1
2
0
1
2
0
1
2
0
1
2
0
1
2
0
1
2
0
1
2
0
1
65
65
65
65
66
66
66
66
66
66
66
66
66
66
66
66
1
2
3
4
7
9
10
12
40
45
50
55
0
5
10
15
20
25
30
35
40
45
50
55
60
60
60
60
60
60
60
60
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
IEEE C802.16m-09/0272
0
32
60
1
33
60
2
34
60
0
35
60
1
37
60
2
39
60
0
41
60
1
43
60
2
45
60
0
46
60
1
49
60
2
50
60
0
51
60
1
53
60
2
55
60
0
57
60
1
58
60
2
60
60
0
63
60
1
64
60
2
65
60
0
66
60
15.3.7.2.1.2.2 Transmission of S-SCH Series
The subcarrier spacing of S-SCH is two times larger than that of a regular data OFDM symbol. Every third
subcarrier is modulated using a boosted value with a specific series defined in 15.3.7.2.1.2.1. The subcarrier
modulation for S-SCH is provided by the following equations, which are FFS. DC tone shall be nulled.
Figure X-4 illustrates an example of S-SCH frequency domain structure for channel bandwidths of 5, 10 and 20
MHz.
12
IEEE C802.16m-09/0272
DC Tone
0
88
256 301
384 412
512
615 639
723 767
936
1023
99 subcarriers 102 subcarriers
2nd Part
1st Part
2nd Part
1st Part
2nd Part
1st Part
2nd Part
1st Part
88 subcarriers
87 subcarriers
5 MHz
6 subcarriers
9 subcarriers
10 MHz
3 subcarriers
6 subcarriers
9 subcarriers
20 MHz
Segment 1
Segment 2
Segment 3
Figure X-4 Example of S-SCH Frequency Domain Structure
For the deployment of femtocells, interferences between femtocells and other cells in S-SCH shall be mitigated.
The interference mitigation scheme is FFS.
15.3.7.2.1.3 Support of WirelessMAN-OFDMA
Advanced Air Interface shall exist in both green field and mixed deployments. In mixed deployments, the
WirelessMAN-OFDMA preamble shall be always present. The Advanced Air Interface SCH shall enable AMSs
to synchronize in frequency and time without requiring WirelessMAN-OFDMA preamble.
Figure X-5 shows an example of Advanced Air Interface SCH architecture in mixed deployments.
13
IEEE C802.16m-09/0272
WirelessMAN-OFDMA Frame
Advanced Air Interface Superframe
Advanced Air Interface Frame
D
FDD Mode
TDD Mode
D
D
D
Frame Offset
D D D D D D D
D D D D D D D
D D D D D D D
D D D D D D D
D
D
D
D
U
U
U
U
Frame Offset
D D D U U U D
D D D U U U D
D D D U U U D
D D D U U U D
WirelessMAN-OFDMA preamble
Idle Time
Advanced Air Interface SCH
Figure X-5 Advanced Air Interface SCH Architecture Supporting WirelessMAN-OFDMA
-----------------------------------------------------------End of the Text---------------------------------------------------------
14