IEEE C802.16m-09/1548r2
Project
IEEE 802.16 Broadband Wireless Access Working Group <http://ieee802.org/16>
Title
Proposed PHY structure of Bandwidth Request Channel for IEEE 802.16m Amendment
Text
Date
Submitted
2009-07-06
Source(s)
Hwasun Yoo, Kaushik Josiam,
+82-31-279-4983
Min-Ho Jang, Heewon Kang
hwasun.yoo@samsung.com
Samsung Electronics Co., Ltd.
Re:
802.16m amendment working document
Abstract
The contribution proposes the text of BW REQ channel to be included in the 802.16m
amendment.
Purpose
To be discussed and adopted by TGm for the 802.16m amendment.
Notice
Release
Patent
Policy
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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
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acknowledges and accepts that this contribution may be made public by IEEE 802.16.
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<http://standards.ieee.org/guides/bylaws/sect6-7.html#6> and
<http://standards.ieee.org/guides/opman/sect6.html#6.3>.
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<http://standards.ieee.org/board/pat>.
1
IEEE C802.16m-09/1548r2
Proposed PHY structure of Bandwidth Request Channel for IEEE
802.16m Amendment Text
Hwasun Yoo, Kaushik Josiam, Min-Ho Jang, Heewon Kang
Samsung Electronics Co., Ltd.
1. Introduction
The contribution proposes the text on the physical layer structure of the Bandwidth Request Channel to be
included in the 802.16m amendment ([1]). The proposed text is developed so that it can be readily combined
with IEEE P802.16 Rev2/D8 ([2]), it is compliant to the 802.16m SRD ([3]) and the 802.16m SDD ([4]), and it
follows the style and format guidelines in ([5]). The related simulation results are provided in
C802.16m-09/1549r1[6].
2. References
[1] IEEE 802.16m-09/0010r2, “802.16m Amendment Working Document (AWD)”
[2] IEEE P802.16 Rev2/D8, “Draft IEEE Standard for Local and Metropolitan Area Networks: Air Interface
for Broadband Wireless Access,” Dec. 2008.
[3] IEEE 802.16m-07/002r7, “IEEE 802.16m System Requirements Document”
[4] IEEE 802.16m-08/003r6, “IEEE 802.16m System Description Document”
[5] IEEE 802.16m-08/043, “Style guide for writing the IEEE 802.16m amendment”
[6] IEEE 802.16m-09/1549r1, “Performance Evaluation of Proposed Physical Structure for BW REQ Channel”
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IEEE C802.16m-09/1548r2
3. Text proposal for inclusion in the 802.16m amendment
---------------------------------------- Text Proposal #1 Start --------------------------------------------------Replace section 15.3.9.1.5, page 286-288 with the following text:
15.3.9.1 Physical Uplink Control Channel
15.3.9.1.5 Bandwidth Request Channel
In the LZone with PUSC, a BW REQ tile is defined as gour contiguous subcarriers by six OFDM symbols. The number
of BW REQ tiles per BW REQ channel is three or six. Each BW REQ tile carries a BW REQ access sequence preamble
only as shown in Figure 502.
In the MZone, a BW REQ tile is defined as six contiguous subcarriers by six OFDM symbols. Each BW REQ channel
consists of three distributed BW-REQ tiles. Each BW REQ tile carries a BW REQ accesss sequence preamble and part
of a BW REQ message as shown in Figure 501.. The AMS may transmit the access sequence preamble only and leave
the resources for the quick access BW REQ message unused.
Time
Frequency
Prn,0
Prn,1
Mn,0
Mn,1
Prn,2
Prn,3
Prn,4
Prn,5
Mn,6
Mn,7
Prn,6
Prn,7
Prn,8
Prn,9
Mn,12
Mn,13
Prn,10
Prn,11
Prn,12
Prn,13
Mn,18
Mn,19
Prn,14
Prn,15
Prn,16
Prn,17
Mn,24
Mn,25
Prn,18
Prn,19
Prn,20
Prn,21
Mn,30
Mn,31
Prn,22
Prn,23
Prn,24
Prn,25
Mn,2
Mn,3
Prn,26
Prn,27
Prn,28
Prn,29
Mn,8
Mn,9
Prn,30
Prn,31
Prn,32
Prn,33
Mn,14
Mn,15
Prn,34
Prn,35
Prn,36
Prn,37
Mn,20
Mn,21
Prn,38
Prn,39
Prn,40
Prn,41
Mn,26
Mn,27
Prn,42
Prn,43
Prn,44
Prn,45
Mn,32
Mn,33
Prn,46
Prn,47
Prn,48
Prn,49
Mn,4
Mn,5
Prn,50
Prn,51
Prn,52
Prn,53
Mn,10
Mn,11
Prn,54
Prn,55
Prn,56
Prn,57
Mn,16
Mn,17
Prn,58
Prn,59
Prn,60
Prn,61
Mn,22
Mn,23
Prn,62
Prn,63
Prn,64
Prn,65
Mn,28
Mn,29
Prn,66
Prn,67
Prn,68
Prn,69
Mn,34
Mn,35
Prn,70
Prn,71
Figure 501- 6X6 BW REQ Tile Structure in the Advanced Air Interface
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IEEE C802.16m-09/1548r2
frequency
time
P4
P8
P12
P16
P20
P1
P5
P9
P13
P17
P21
M0
M6
M12
M18
M24
M30
M1
M7
M13
M19
M25
M31
P2
P6
P10
P14
P18
P22
P3
P7
P11
P15
P19
P23
P0
P4
P8
P12
P16
P20
P1
P5
P9
P13
P17
P21
M2
M8
M14
M20
M26
M32
M3
M9
M15
M21
M27
M33
P2
P6
P10
P14
P18
P22
P3
P7
P11
P15
P19
P23
P0
P4
P8
P12
P16
P20
P1
P5
P9
P13
P17
P21
M4
M10
M16
M22
M28
M34
M5
M11
M17
M23
M29
M35
P2
P6
P10
P14
P18
P22
P3
P7
P11
P15
P19
P23
...
P0
...
Figure 501 6X6 BW REQ Tile Structure in the Advanced Air Interface
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IEEE C802.16m-09/1548r2
frequency
time
P4
P8
P12
P16
P20
P1
P5
P9
P13
P17
P21
P2
P6
P10
P14
P18
P22
P3
P7
P11
P15
P19
P23
P0
P4
P8
P12
P16
P20
P1
P5
P9
P13
P17
P21
P2
P6
P10
P14
P18
P22
P3
P7
P11
P15
P19
P23
P0
P4
P8
P12
P16
P20
P1
P5
P9
P13
P17
P21
P2
P6
P10
P14
P18
P22
P3
P7
P11
P15
P19
P23
...
P0
...
Figure 502 4X6 BW REQ Tile Structure in 16m PUSC mode
A BW REQ tile in the Advanced Air Interface specifications is defined as 6 contiguous subcarriers by 6 OFDM symbols
as Figure 501, where P0 , P1 , , P23 and M 0 , M1 , , M 35 indicate modulated BW REQ preamble sequence and
modulated BW REQ message, respectively.
As shown in Figure 501, the BW REQ preamble shall be transmitted on a resource that spans 4 subcarriers by 6 OFDM
symbols. Additionally a quick access BW REQ message shall may be carried in the data portion of the tile that spans 2
contiguous subcarriers by 6 OFDM symbols. Each BW REQ channel shall comprise of 3 distributed BW REQ tiles for
frequency diversity. The procedure for allocation of resources for transmission of UL control information and the
formation of DRUs for such transmission is TBD.
Let
b0 , b1 , b2 ,
, b15 denote a total of 16 bits of information to be carried as the quick access message. 4 bits of the 16
information bits shall be carried in the BW REQ preamble using the preamble index. The combined resource in the data
portion of the three tiles that form the BW REQ channel shall be used to transmit the remaining 12 bits of information.
The construction of the BW REQ preamble for a 6x6 tile structure is TBD.
The 12 bits of information in the quick access message transmitted in the BW REQ channel shall be encoded into 72 bits
c0 , c1 , c2 , , c71 using the 1/6 TBCC code described in <<< section 15.3.9.2.1.2 (Channel coding for secondary fast
feedback channel)>> with paramters L  12 , K bufsize  60 and
M  72 . The 72 coded bits shall then be QPSK
modulated as described in Section TBD and scrambled to generate 36 data symbols,
5
v0 , v1 , v2 ,
, v35 . The combined
IEEE C802.16m-09/1548r2
data portions of the three distributed BW REQ tiles that form the BW REQ channel shall be used to transmit these data
symbols.
In order to support operation in the legacy mode, a BW REQ tile shall be defined as 4 contiguous subcarriers by 6 OFDM
symbols. As shown in Figure 502, only the BW REQ access sequence or BW REQ preamble shall be transmittedin all
24 subcarriers that form the BW REQ tile. In this case, the BWREQ _ PREAMBLE _ INDEX shall be randomly
selected from all available logical preamble sequences.
---------------------------------------- Text Proposal #1 End ---------------------------------------------------
---------------------------------------- Text Proposal #2 Start --------------------------------------------------Replace section 15.3.9.2.5, page 295 with the following text:
15.3.9.2 Uplink Control Channels Physical Resource Mapping
15.3.9.2.5 Bandwidth request channel
6
IEEE C802.16m-09/1548r2
Contention based random access is used to transmit bandwidth request BW REQ information on this control channel.
The bandwidth request (BW REQ) channel contains resources for the AMS to send a BW REQ access sequence and an
optional quick access message. Prioritized bandwidth requests are supported on this channel. The mechanism for such
prioritization is TBD. Both 3-step and 5-step BW REQ procedures described in <<Section 15.2.2 >> are supported
on this channel.
When the type of bandwidth requested by an AMS is not one of urgent bandwidth request types defined in
<<Section 15.x>>, the AMS randomly chooses a preamble index k with a range from 0 to 23. The selected preamble
index is used for generating BW REQ preamble sequence according to Table XXX. The generated BW REQ
preamble sequence is BPSK modulated, scrambled and mapped on each BW tiles as P0 , P1 , , P23 .
Table XXX. Sequence for BW REQ preamble
Index k
BW REQ preamble sequence
Index k
BW REQ preamble sequence
0
111111111111111111111111
12
111111111111000000000000
1
101011100010101011100010
13
101011100010010100011101
2
100101110001100101110001
14
100101110001011010001110
3
110010111000110010111000
15
110010111000001101000111
4
101001011100101001011100
16
101001011100010110100011
5
100100101110100100101110
17
100100101110011011010001
6
100010010111100010010111
18
100010010111011101101000
7
110001001011110001001011
19
110001001011001110110100
8
111000100101111000100101
20
111000100101000111011010
9
111100010010111100010010
21
111100010010000011101101
10
101110001001101110001001
22
101110001001010001110110
11
110111000100110111000100
23
110111000100001000111011
For the 3step BW REQ procedure, 15bits of BW request information is constructed from 12bits of STID and 3bits
of pre-defined BW size information, which is decribed in Section (15.X). Let s0 , s1 , s2 , , s11 and q0 , q1 , q2
denot e the STID and pre-defined BW size information, respectively. By reordering the bits of STID and
pre-defined BW size information, 15bits of BW request information is formed as
b0b1b2b3b4b5b6b7b8b9b10b11b12b13b14  s0 s1s2 s3 s4 s5 s6 s7 s8 s9 s10 s11 p0 p1 p2
Equation (YYY)
where
pi  mod(si  si 3  si 6  si 9  qi , 2)
0i 3
The BW REQ preamble index k is calculated by
k  bin2dec  b12b13b14   8  mod

3
i 0
The BW REQ message includes the MSB 12bits of BW REQ information,
7

bin2dec  b3ib3i 1b3i 2 ,3
Equation (ZZZ)
b0b1b2b3b4b5b6b7b8b9b10b11 , and 6bit
IEEE C802.16m-09/1548r2
CRC. The CRC bits are generated by a polynomial x  x  1 and an input of 15bits of total BW REQ
information. The BW REQ message bits are encoded into 72 bits by using [Option 1: TBCC 1/4][Option 2: Block
code with rate 1/4], QPSK modulated, scrambled, and mapped on M 0 , M1 , , M 35
6
In legacy support with PUSC, a BW REQ tile shall be defined as 4 contiguous subcarriers by 6 OFDM symbols.
As shown in Figure 502, only the BW REQ preamble shall be transmitted in all 24 subcarriers that form the BW
REQ tile. In this case, the preamble index k shall be randomly selected with a range from 0 to 23.
---------------------------------------- Text Proposal #2 End ---------------------------------------------------
8