1. Various Bit Order Date: 2010-04-21 Authors: April 2011 Month Year
doc.: IEEE yy/xxxxr0
April 2011
Various Bit Order
Date:
Authors:
Youhan Kim
John Doe, Some Company

2. VHT-SIG-B CRC in SERVICE Field (1/2)
April 2011
VHT-SIG-B CRC in SERVICE Field (1/2)
LSB is transmitted first in PHY in general
Example: D VHT-SIG-A definition
For example, for a group ID of 11 (0b001011), B4=1, B5=1, B6=0, B7=1, B8=0 and B9=0 in VHT-SIG-A1.
MSB is transmitted first in HT-SIG CRC
REVmb D8.0 – CRC calculation for HT-SIG
The CRC field is transmitted with c7 first.
VHT-SIG-A CRC follows the HT-SIG CRC (MSB first)
Youhan Kim

3. VHT-SIG-B CRC in SERVICE Field (2/2)
April 2011
VHT-SIG-B CRC in SERVICE Field (2/2)
D0.3 does not explicitly specify whether MSB or LSB is transmitted first for VHT-SIG-B CRC
Suggest to follow HT-SIG/VHT-SIG-A (MSB first)
Suggested modification in D0.3
Add the following sentence at the end of subclause (CRC calculation for VHT-SIG-B)
The CRC field is transmitted with C7 first. Hence, C7 is mapped to B8 of the SERVICE field, C6 is mapped to B9, …, and C0 is mapped to B15 of the SERVICE field.
Youhan Kim

4. CH_BANDWIDTH_IN_NON_HT (1/3)
April 2011
CH_BANDWIDTH_IN_NON_HT (1/3)
It is not clear if CH_BANDWIDTH is transmitted LSB first or MSB first
E.g. For NON_HT_CBW40, B5 = 0 or 1?
Youhan Kim

5. CH_BANDWIDTH_IN_NON_HT (2/3)
April 2011
CH_BANDWIDTH_IN_NON_HT (2/3)
Suggested clarification
LSB is transmitted first in PHY in general
CH_BANDWIDTH should also be transmitted LSB first
E.g. NON_HT_CBW80 – 10
B5 = 0, B6 = 1
Youhan Kim

6. CH_BANDWIDTH_IN_NON_HT (3/3)
April 2011
CH_BANDWIDTH_IN_NON_HT (3/3)
Suggested modification in D0.3
Change the definition of B5-B6 in Table 17-ac1 as follows
Add the following bullet in p. 86, line 37 ( PLCP DATA scrambler and descrambler)
00 0 (NON_HT_CBW20),
01 1 (NON_HT_CBW40),
10 2 (NON_HT_CBW80),
11 3 (NON_HT_CBW160/NON_HT_CBW80+80),
--- CH_BANDWIDTH_IN_NON_HT is transmitted LSB first. For example, NON_HT_CBW80 has a value of 2, which is ’10’ in 2 bit binary representation, hence, B5=0 and B6=1.
Youhan Kim

7. April 2011
Straw Poll
Do you support the clarifications on the bit order as shown in red on slides 3 and 6?
Youhan Kim