2009-10-31
IEEE 802.16m-09/2466
Project
IEEE 802.16 Broadband Wireless Access Working Group <http://ieee802.org/16>
Title
Corrections to BWREQ text (15.3.9.2.5) for the IEEE 802.16m/D2
Date
Submitted
2009-11-05
Source(s)
Alexei Davydov
Yuan Zhu
Intel Corporation
alexei.davydov@intel.com
yuan.y.zhu@intel.com
Re:
Category: LB30a / Area: Chapter 15.3.9 (UL Control)
Abstract
The contribution proposes text changes to the description bandwidth request channel
Purpose
To be discussed and adopted by TGm for the 802.16m D2
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IEEE 802.16m-09/2466
Proposed Text for BWREQ (15.3.9.2.5) for the IEEE 802.16m/D2
Alexei Davydov, Yuan Zhu
Intel Corporation
Introduction
This contribution proposes some clarification text to be applied to IEEE 802.16m/D2 [1].
1) References
[1] IEEE 802.16m/D2, “DRAFT Amendment to IEEE Standard for Local and metropolitan area networks
Part 16: Air Interface for Broadband Wireless Access Systems Advanced Air Interface”, Oct 2009
Proposed Text
<Modify text in section 15.3.9.2.5 Bandwidth request channel>
--------------------------------Start of the text #1 ---------------------------------------{Modify text in section 15.3.9.2.5, page 493, line 14}
The mapping between the combination of the frame number and the 16 bits of the bandwidth request message
b0b1b2b3b4b5b6b7b8b9b10b11b12b13b14b15 to the physical preamble index u is as below equation.

4
where r  mod 
bin2decb3i b3i 1b3i 2 , 3  , q  bin2decb0b1b2b3b4b5b6b7b8b9b10b11  / 24   t and t is frame number calculated
 i 0

as four times superframe number plus frame number within a superframe (in range of 0 to 3).
------------------------------- End of text # 1 --------------------------------------------------------------------------Start of the text #2 ---------------------------------------{Modify text in section in section 15.3.9.2.5, page 493, line 21}
The 16 bit information in the quick access message transmitted in the BR channel shall be used to generate 5 bits CRC r0r1r2r3r4 using
generating polynomial G(x)=x5+x4+x2+1. The 13 bits information together with the 5 bits CRC bits,
b0b1b2b3b4b5b6b7b8b9b10b11b12b13b14b15r0r1r2r3r4, shall be encoded into 72 bits c0,c1,c2,…,c71 using the TBCC code with parameters L=18,
Kbufsize= 72 and M = 72. The 72 coded bits shall then be QPSK modulated and scrambled to generate 36 data symbols M0,M1,...,M35.
The combined resource of the data portion in the three distributed BR tiles that form the BR channel shall be used to transmit these
data symbols.
To calculate 5 bits CRC the following procedure is applied:
a) The first bit b0 corresponds to the x12 term and the last bit b12 corresponds to the x0 term of the information polynomial
b) The information polynomial multiplied by x5 is divided by polynomial G(x)= x5+x4+x2+1
c) The 5 bits of the CRC are set so that the first bit of r0 corresponds to x4 term of the remainder polynomial and the last bit r4
corresponds to x0 term of the remainder polynomial
------------------------------- End of text # 2 -------------------------------------------
2