IEEE C802.16m-09/0291
\Project
IEEE 802.16 Broadband Wireless Access Working Group <http://ieee802.org/16>
Title
Proposed Text of UL Bandwidth Request Channel Sections for the IEEE 802.16m
Amendment
Date
Submitted
2009-01-07
Source(s)
Sungho Park
Park_SH@lge.com
Jinyoung Chun
jychun03@lge.com
Heejeong Cho
hj77cho@lge.com
Sukwoo Lee
sugoo@lge.com
Bin-Chul Ihm
bcihm@lge.com
LG Electronics
Re:
“802.16m amendment working document”:
IEEE 802.16m-08/053r1, “Call for Comments and Contributions on Project 802.16m
Amendment Working Document”
Target topic: “11.9 UL PHY control structure, especially mapping”
Abstract
The contribution proposes the text of UL control structure section 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
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.
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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>.
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-09/0291
Proposed Text of UL Bandwidth Request Channel Sections
for the IEEE 802.16m Amendment
Sungho Park, Jinyoung Chun, Heejeong Cho, Sukwoo Lee, and Bin-Chul Ihm
LG Electronics
1. Introduction
The contribution proposes the text of UL bandwidth request channel sections to be included in the 802.16m
amendment. The proposed text is developed so that it can be readily combined with IEEE P802.16 Rev2/D8 [1],
it is compliant to the 802.16m SRD [2] and the 802.16m SDD [3], and it follows the style and format guidelines
in [4].
2. Modifications to the SDD text
The text proposed in this contribution is based on subclause 11.9 in the IEEE 802.16m SDD [3]. The
modifications to the SDD text are summarized below:

Fixed the sentences by amendment rule. For example, changed ‘can’ to ‘may’ and removed ‘example’
and ‘FFS’ and so on.

Clarified ambiguous parts such as information contents of UL bandwidth request and inserted the UL
Bandwidth Request Channel Structure and mapping rule [5-6].

Clarified the definition of the QoS ID and inserted the two bandwidth request schemes using the QoS ID
[7-8].
3. References
[1] IEEE P802.16 Rev2/D8, “Draft IEEE Standard for Local and Metropolitan Area Networks: Air Interface
for Broadband Wireless Access”
[2] IEEE 802.16m-07/002r7, “802.16m System Requirements”
[3] IEEE 802.16m-08/003r6, “The Draft IEEE 802.16m System Description Document”
[4] IEEE 802.16m-08/043, “Style guide for writing the IEEE 802.16m amendment”
[5] IEEE 802.16m-09/0289, “Proposed Text of UL Fast Feedback Channel Structure Sections for the IEEE
802.16m Amendment”
[6] IEEE 802.16m-09/0015, “Bandwidth Request Channel”
[7] IEEE 802.16m-09/0292, “Definition of the QoS ID”
[8] IEEE 802.16m-09/0293, “Bandwidth Request Schemes using the QoS ID”
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IEEE C802.16m-09/0291
4. Text proposal for inclusion in the 802.16m amendment
-------------------------------
Text Start
---------------------------------------------------
Insert a new section 15:
15. Advanced Air Interface
15.3. Physical layer
15.3.9. UL Control Structure
15.3.9.1.
UL Control Information Classification
15.3.9.1.1.
Channel quality feedback
15.3.9.1.2.
MIMO feedback
15.3.9.1.3.
HARQ feedback
15.3.9.1.4.
Synchronization
15.3.9.1.5.
Bandwidth request
Bandwidth requests are used to provide information about the needed uplink bandwidth to the ABS. Bandwidth requests are
transmitted through indicators or messages. A bandwidth request indicator notifies the ABS of a UL grant request by the AMS
sending the indicator. Bandwidth request messages include information about the status of queued traffic at the AMS such as buffer
size and quality of service, including QoS identifiers negotiated during creating the flows, which represent scheduling type (e.g.
control signaling, rtPS, nrtPS) and priority related to the flows for bandwidth request.
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IEEE C802.16m-09/0291
15.3.9.1.6.
E-MBS feedback
15.3.9.2.
UL Control Channels
15.3.9.2.1.
UL Fast Feedback Channel
15.3.9.2.2.
UL HARQ Feedback Channel
15.3.9.2.3.
UL Sounding Channel
15.3.9.2.4.
Ranging Channel
15.3.9.2.5.
Bandwidth Request Channel
Contention based or non-contention based random access is used to transmit bandwidth request information on this control channel.
The random access based bandwidth request procedure is described in Figure xxx. A 5-step regular procedure (step 1 to 5) and a
3-step quick access procedure (step 1, 4 and 5) are supported concurrently. The 5-step regular procedure is used as a fallback mode for
the 3-step bandwidth request quick access procedure. In step 1, AMS sends a bandwidth request indicator for quick access that
indicates information such as partial AMS addressing, request size and scheduling type. In step 2 and step 4, the ABS may send
message to acknowledge the reception status and may allocate uplink grant based on certain policy. After sending the bandwidth
request indicator, the AMS retries step 1 if no grant has been received within the specified time duration, which is allocated based on
the scheduling type and/or priority. In step 3, the AMS sends BW-REQ message containing different information contents depending
on request unit basis (e.g., QoS unit or MS unit) at pre-allocated region by UL grant. In step 5, the AMS sends full AMS addressing
with user data only for 3-step quick access procedure and may piggyback additional BW REQ information along with user data during
uplink transmission.
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IEEE C802.16m-09/0291
Bandwidth Request indicator
1
Acknowledgement for BR indicators
2
UL grant for BW REQ message
3
MS
BS
BW REQ message
Acknowledgement for BW REQ
4
UL grant
UL scheduled transmission with optional
piggybacked bandwidth request
5
Figure xxx. Bandwidth Request Procedure
15.3.9.2.5.1.
Multiplexing with other control channels and data channels
The bandwidth request channel starts at a configurable location with the configuration defined in a DL broadcast control message. The
bandwidth request channel is FDM with other UL control and data channels.
15.3.9.2.5.2.
PHY structure
The bandwidth request (BW REQ) channel contains resources for the AMS to send in BW REQ access sequence at the step-1 of the
bandwidth request procedure. Figure yyy and figure zzz show BW-REQ PHY structures for UL FDM mode supporting the
WirelessMAN-OFDMA operation and the other modes. A BW REQ channel consists of 6 distributed BW-REQ tiles and each BW
REQ tile is defined as 4 contiguous subcarriers by 6 OFDM symbols in UL FDM mode supporting the WirelessMAN-OFDMA
operation. And in the other modes, a BW REQ channel consists of 3 distributed BW-REQ tiles and each tile is defined as 6
contiguous subcarriers by 6 OFDM symbols.
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IEEE C802.16m-09/0291
Frequency
Time
S1
S2
BW-REQ message
BW-REQ Indicator
: Length 12,
: same sequence for three tiles
S3
: 6 Symbols
: spread by identical sequence
(length 12) adopted in the
BW-REQ Indicator
S4
S5
S6
Figure yyy. The composition of a BW REQ PHY structure for UL FDM mode supporting the WirelessMAN-OFDMA operation
Frequency
Time
S1
S2
S3
BW-REQ Indicator
: Length 12,
: same sequence for three tiles
S4
BW-REQ message
: 6 Symbols
: spread by identical sequence
(length 12) adopted in the
BW-REQ Indicator
S5
S6
Figure zzz. The composition of a BW REQ PHY structure for the other modes
The length of BW-REQ sequences is 12 and Maximum 12 bandwidth requests are CDM on the same BW-REQ channel. The
sequences are [DFT or ZC] with length 12. The modulation, coding and mapping is as below:
1.
AMS selects one of BW-REQ sequences and transmits it to the region for BW-REQ indicator in figure yyy or zzz.
2.
BW-REQ messages of 9 bits are coded to 12 bits by block code generator of table 4 and modulated to 6 QPSK symbols. The
coding methods are similar to a numerical formula (1) in 15.3.9.2.1.4.
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IEEE C802.16m-09/0291
3.
These are spread by the sequence adopted in the BW-REQ indicator and mapped to the region for BW-REQ message in figure
yyy or zzz.
Table ooo. Block code matrix for BW-REQ message.
Index(i)
vi,0
vi,1
vi,2
vi,3
vi,4
vi,5
vi,6
vi,7
vi,8
0
1
2
3
4
5
6
7
8
9
10
11
0
0
0
0
0
0
1
1
1
1
1
1
0
0
0
1
1
1
0
0
0
1
1
1
0
0
1
0
0
1
0
0
1
0
0
1
0
1
0
0
1
0
0
1
0
0
1
0
1
1
1
1
1
1
1
1
1
1
1
1
0
1
1
1
0
1
1
1
0
0
0
0
0
0
1
1
0
0
0
1
0
1
1
1
1
1
1
0
1
0
1
1
1
1
0
1
0
0
0
1
1
1
1
1
1
1
1
1
Multiple BW REQ channels may be allocated per subframe using FDM.
15.3.9.3.
UL Inband Control Signaling
Uplink control information may be multiplexed with data on the UL data channels as MAC headers or MAC management messages.
Inband control signaling contains information such as uplink bandwidth requests or bandwidth assignment updates.
-------------------------------
Text End
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