doc.: ieee 802.11-10/1288r1 submission november 2010 sameer vermani, qualcommslide 1 frame format...
TRANSCRIPT
doc.: IEEE 802.11-10/1288r1
Submission
November 2010
Sameer Verma
ni, Qualco
mm
Slide 1
Frame Format for GroupID ManagementDate: 2010-11-08
Name Affiliations Address Phone email Sameer Vermani Qualcomm San Diego, CA 858-845-3115 [email protected]
Santosh Abraham Qualcomm San Diego, CA 858-651-6107 [email protected]
Robert Stacey Intel Hillsboro OR 503-724-0893 [email protected]
Youhan Kim Atheros San Jose, CA [email protected]
Yong Liu Marvell Santa Clara CA [email protected]
Mathew Fischer Broadcom [email protected]
Joonsuk Kim Broadcom [email protected]
Brian Hart Cisco Systems San Jose, CA 408-526-3346 [email protected]
Daewon Lee LG Electronics Korea +82-31-450-7897 [email protected]
Minho Cheong ETRI Korea +82 42 860 5635 [email protected]
Uikun Kwon
Samsung [email protected]
Sean Coffey Realtek [email protected]
Vish Ponnampalam MediaTek [email protected]
George Vlantis ST-Ericsson [email protected]
Authors:
doc.: IEEE 802.11-10/1288r1
Submission
November 2010
Sameer Verma
ni, Qualco
mm
Slide 2
Abstract• Downlink (DL) Multi-user (MU) MIMO is identified as a key
technology to improve the overall network performance– GroupID concept is essential to specify spatial stream allocation in an efficient
manner [1]
• Spec framework document [2] already specifies 6 bits of groupID in VHT-SIG-A
• This document proposes a groupID management frame which is simple, has low overhead and is fixed length
doc.: IEEE 802.11-10/1288r1
Submission
Unicast GroupID management is needed
• A groupID assignment needs to be ACKed before that groupID can be used– More complicated error handling for broadcast messages
• We do need an approach which allows us to manage MU group membership on a per-STA basis– Most events in the network will happen independently across STAs
• Efficiency improvement with broadcast is not significant– The same number of frames need to be transmitted for broadcast and
unicast
• We propose to adopt a unicast format for groupID management– Whether or not to adopt an additional broadcast format is still TBD
QualcommSlide 3
doc.: IEEE 802.11-10/1288r1
Submission QualcommSlide 4
Unicast GroupID Assignment FramePreamble
(non-HT, HT, VHT)MAC
Header Frame Body FCS
ActionCategory
Membership status
STA position
VHT GroupID Assignment
GroupID table
3 bits
Field #1 Field #64
• Above frame can be transmitted at association or anytime MU group assignment of an STA needs to be updated
– 1 bit “membership status” specifies whether the STA is a member of the group or not– 2 bit STA position specifies spatial stream position of STA in the corresponding group
• Fixed payload of just 24 octets– Remains same even if all groupIDs are being updated
• Classification as “robust” action frame is TBD• SU GID field in the table is always hardcoded to
– STA membership as 1– STA position as 1
Robust or Not Robust is TBD
doc.: IEEE 802.11-10/1288r1
Submission
Pre-Motion 1
• Do you accept unicast messaging for groupID assignment ?
QualcommSlide 5
doc.: IEEE 802.11-10/1288r1
Submission
Pre-Motion 2
• Do you accept the fixed length frame shown on slide 3 of this document (Robust or not robust is TBD) for groupID assignment (exact location of fields TBD) and agree to add the following text to the spec framework document?
“Group ID Management
The Group ID Management frame is used to assign or change STA positions corresponding to one or more Group IDs. The frame body in such frames shall consist of a 24 octet Group ID Assignment field, which contains 3 bits for each one of the 64 group IDs. The 3 bits for each group ID consist of the following:
– 1 bit “membership status” which specifies whether or not the STA is a member of the corresponding group ID– 2 bit STA position which specifies spatial stream position of the STA in the corresponding group ID
The classification of this action frame as “robust” is TBD. The exact location of the above fields within the frame body is also TBD.”
Y- N - A-
QualcommSlide 6
doc.: IEEE 802.11-10/1288r1
Submission Sameer Vermani, Qualcomm
References
[1] 10/582r1, “GroupID in VHT-SIG Field”
[2] 09/0992r15, “Specification Framework for TGac”
November 2010
Slide 7