1. Channel Selection and Management for 11ac
July 2010
doc.: IEEE /0781r0
July 2010
Channel Selection and Management for 11ac
Date:
Authors:
Yujin Noh, LG Electronics
Yujin Noh, LG Electronics

2. July 2010
Abstract
80MHz channelization based on non-overlapping channel allocation
Behavior limits for 80MHz channelization
Operating Classes for 80MHz channelization
Considering scanning rule of the primary channel and secondary channel for 80MH channel bandwidth
Yujin Noh, LG Electronics

3. Background Support up to 80MHz channel bandwidth for 11ac
July 2010
Background
Support up to 80MHz channel bandwidth for 11ac
The primary channel can be allowed to be set to any 20MHz subchannel over 80MHz channel bandwidth for some 11ac configurations
CSMA/CA approach for the primary channel
The rest of subchannels have been idle for at least a PIFS interval prior to the expiry of backoff counter
Yujin Noh, LG Electronics

4. July 2010
Motivation
5 Coexistence (0992r11)
R5.C:The Primary Channel may be designated to any 20MHz subchannel over 80MHz channel bandwidth, where Primary Channel designation is subject to co-existence(OBSS) rules yet to be defined.
80MHz channelization is clear for the non-overlapping channel allocation
Necessity to be defined for operating classes including the Channel sets and the behavior limits sets
Necessity to be defined for Overlapping rule of the primary channel and secondary channel as the first step
Yujin Noh, LG Electronics

5. Channel Allocation for 11ac 40MHz
July 2010
Channel Allocation for 11ac 40MHz
40MHz operation based on two adjacent 20MHz channels in the same way of 11n
The position of the primary/secondary channels has patterns
The permissible 40MHz channel allocation options are defined in terms of the designated primary/secondary channel
Non-overlapping channel allocation for each 40MHz channel
Refer to behavior limits sets 13 and 14
PrimaryChannelLowerBehavior and PrimaryChannelUpperBehavior
Yujin Noh, LG Electronics

6. Channel Allocation for 11ac 80MHz
July 2010
doc.: IEEE /0781r0
July 2010
Channel Allocation for 11ac 80MHz
80MHz operation with four 20MHz subchannels in a row
Non-overlapping channel allocation in 5GHz band
Simple extension from 40MHz channel allocation
The available number of 80MHz channel
GHz
GHz
GHz
Non-overlapping 2 1
Yujin Noh, LG Electronics
Yujin Noh, LG Electronics

7. Definition of 11ac BSS and VHT AP for 80MHz
July 2010
Definition of 11ac BSS and VHT AP for 80MHz
20/40/80 MHz BSS
A BSS in which the supported channel width of the access point (AP) or independent BSS (IBSS) dynamic frequency selection (DFS) owner (IDO) station (STA) is 20 MHz, 40 MHz and 80MHz (Channel Width field is set to TBD) and secondary channel, tertiary channel and quaternary channel field indication is TBD
Indication field for secondary channel, tertiary channel and quaternary channel field will be defined
80 MHz capable (EC) VHT AP
An VHT AP that included a value of TBD in the Supported Channel Width Set subfield (indicating its capability to operate on a 80 MHz channel) of its most recent transmission of a frame containing an VHT Capabilities element
Yujin Noh, LG Electronics

8. Behavior limits for 80MHz channelization
July 2010
doc.: IEEE /0781r0
July 2010
Behavior limits for 80MHz channelization
PrimaryChannelLower_80_Behavior
20/40/80 MHz BSS primary channel with secondary channel above the primary channel or 20 MHz BSS primary channel operated by an EC VHT AP and also 20 MHz operational channel for a non-AP STA when the non-AP STA is associated with an EC VHT AP or 20/40 MHz BSS primary channel operated by an EC VHT AP and also 20/40 MHz operational channel for a non-AP STA when the non-AP STA is associated with an EC VHT AP
This behavior limit is for the location of the secondary channel relative to the primary channel
Yujin Noh, LG Electronics
Yujin Noh, LG Electronics

9. Behavior limits for 80MHz channelization
July 2010
Behavior limits for 80MHz channelization
PrimaryChannelUpper_80_Behavior
20/40/80 MHz BSS primary channel with secondary channel below the primary channel or 20 MHz BSS primary channel operated by an EC VHT AP and also 20 MHz operational channel for a non-AP STA when the non-AP STA is associated with an EC VHT AP or 20/40 MHz BSS primary channel operated by an EC VHT AP and also 20/40 MHz operational channel for a non-AP STA when the non-AP STA is associated with an EC VHT AP
This behavior limit is for the location of the secondary channel relative to the primary channel
Yujin Noh, LG Electronics

10. Behavior limits for 80MHz channelization
July 2010
Behavior limits for 80MHz channelization
P_S_ChannelsLowerBehavior
20/40/80MHz BSS 40MHz channel with tertiary channel and quaternary channel above the 40MHz channel including primary channel and secondary channel
40MHz channel including primary channel and secondary channel is ruled by 11n
This behavior limit is for the location of the tertiary channel and the quaternary channel relative to the 40MHz channel including the primary channel and the secondary channel
Yujin Noh, LG Electronics

11. Behavior limits for 80MHz channelization
July 2010
Behavior limits for 80MHz channelization
P_S_ChannelsUpperBehavior
20/40/80MHz BSS 40MHz channel with tertiary channel and quaternary channel below the 40MHz channel including primary channel and secondary channel
40MHz channel including primary channel and secondary channel is ruled by 11n
This behavior limit is for the location of the tertiary channel and the quaternary channel relative to the 40MHz channel including the primary channel and the secondary channel
Yujin Noh, LG Electronics

12. Operating Classes for 80MHz channelization
July 2010
Operating Classes for 80MHz channelization
Refer to the example operating classes in the attached supplement document
For operating classes for 80MHz channelization, combination of two behavior limits can be used
Location of the secondary channel relative to the primary channel
Location of the 40MHz channel including the tertiary channel and the quaternary channel relative to the 40MHz channel including the primary channel and the secondary channel
Example of 80MHz channel bandwidth with behavior limits of PrimaryChannelLower_80_Behavior and P_S_ChannelsLowerBehavior
Yujin Noh, LG Electronics

13. Scanning rule for 80MH channel bandwidth (1/3)
July 2010
Scanning rule for 80MH channel bandwidth (1/3)
Overlapping rule of the primary channel and secondary channel
Some parts of overlapping rule of 11ac can follow the scanning requirement of 11n
Scanning requirement of 11n has considered the fairness fully between the existing BSS and the new BSS
11n products work well with less complexity so far.
It will be useful that the fairness aspect is kept considering up to 80MHz channel bandwidth for 11ac
In that sense, the 11ac scanning rule with the primary channel and the secondary channel between the new BSS and the existing BSS can be aligned with the 11n scanning rule
Yujin Noh, LG Electronics

14. Scanning rule for 80MH channel bandwidth (2/3)
July 2010
Scanning rule for 80MH channel bandwidth (2/3)
The rest parts of overlapping rule are ambiguous because of introduction of the tertiary channel and quaternary channel
Considering the widen channel bandwidth for 11ac, it is needed to discuss how the scanning requirement will be supported in an efficient and simple way
Yujin Noh, LG Electronics

15. Scanning rule for 80MH channel bandwidth (3/3)
July 2010
Scanning rule for 80MH channel bandwidth (3/3)
Alignment of the primary channels and secondary channels between the existing BSS and new BSS based on the 11n scanning requirement can be considered as the first step for 11ac
Even though the primary channel and the secondary channel follow the 11n scanning requirement, the rest parts of overlapping rule are ambiguous because of introduction of the tertiary channel and quaternary channel
Scanning requirement between the primary/secondary channel s of the new BSS and the tertiary/quaternary channels of the existing BSS is TBD
Yujin Noh, LG Electronics

16. Summary Non-overlapping 80MHz channel allocation
July 2010
Summary
Non-overlapping 80MHz channel allocation
This document shows the description of operating classes that include the Channel sets and the behavior limits as one of examples
Operating classes can be generalized and modified to fit in the non-overlapping 80MHz channel allocation
Alignment of the primary channels and secondary channels between the existing BSS and new BSS based on the 11n scanning requirement can be considered as the first step for 11ac
Yujin Noh, LG Electronics