Drop Eligibility Indicator (DEI) Discussion
Ganesh Venkatesan (Intel Corporation)
Slide 1
Drop Eligibility Indicator (DEI) Discussion
Date:
2015-05-18
Authors:
May 2016
Ganesh Venkatesan (Intel Corporation)
Slide 2
Abstract
•
802.11aa and 802.11ae introduced the notion of Drop
Eligibility to indicate if the corresponding frame or
frames belonging to the stream are Drop Eligible
•
A Drop Eligible frame (or frames of a Drop Eligible
stream) might be dropped from further processing if the
device has insufficient resources (determination of
insufficient resource condition is out-of-scope)
•
Questions:
–
What does Drop Eligibility mean?
–
Should DEI be represented in Figures 5-1 and 5-2?
9.2.4.6.2,
May 2016
What does Drop Eligibility mean?
Under Insufficient Resources conditions:
1.
Drop the received frame (but still acknowledge it, if it
needs to be acknowledged)
2.
Drop the frame from the transmit path
3.
Do either of the above depending on when the
Insufficient Resources condition occurs
Option 3 is probably the right one
Ganesh Venkatesan (Intel Corporation)
Slide 3
May 2016
Where does DEI belong?
Ganesh Venkatesan (Intel Corporation)
Slide 4
•
Do we need to include DEI in Figure
5-1 and Figure 5-2?
•
If so, where should DEI be in the Tx
path and in the Rx Path
May 2016
Backup
Ganesh Venkatesan (Intel Corporation)
Slide 5
May 2016
DEI Processing
•
10.3.2.9 Ack procedure has the note below:
–
NOTE 2—The receiver STA performs the Ack procedure on all received
frames requiring acknowledgment, even if an MSDU or A-MSDU is
carried partly or wholly within the frame and is subsequently discarded
due to drop eligibility (see DEI subfield in 9.2.4.5 (QoS Control field))
•
9.2.4.6.2 HT Variant has the following:
–
The DEI subfield of the HT Control field(Ed) is 1 bit in length and is set by the
transmitting STA to indicate the suitability of the corresponding MSDU or A-
MSDU to be discarded if there are insufficient resources at the receiving STA. If
there are insufficient resources, a STA that receives an MPDU whose DEI subfield
is equal to 1 carrying all or part of an MSDU or A-MSDU should discard the
MSDU or any MSDUs contained within the A-MSDU in preference to MSDUs
carried in MPDUs whose DEI subfield is equal to 0. See 11.27.2 (SCS procedures).
In an MMPDU, the DEI subfield is reserved. The mechanisms for determining
whether the resources are insufficient or when to discard MSDUs or A-MSDUs are
beyond the scope of this standard.
Ganesh Venkatesan (Intel Corporation)
Slide 6
May 2016
doc.: IEEE 802.11-yy/xxxxr0
Month Year
John Doe, Some Company
Page
IEEE document discussing Drop Eligibility Indicator (DEI) in IEEE 802.11 standards, defining DEI, its implications, and placement in transmission paths. Specific focus on handling frames under insufficient resource conditions and including DEI in figure representations.
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Presentation Transcript
May 2016 doc.: IEEE 802.11-16-0713r0 Drop Eligibility Indicator (DEI) Discussion Date: 2015-05-18 Authors: Name Ganesh Venkatesan Affiliations Intel Corporation Address 2111 NE 25th Ave, Hillsboro, OR 97124 Phone +1 503 334 6720 email Ganesh.venkatesan @intel.com Submission Slide 1 Ganesh Venkatesan (Intel Corporation)
May 2016 doc.: IEEE 802.11-16-0713r0 Abstract 802.11aa and 802.11ae introduced the notion of Drop Eligibility to indicate if the corresponding frame or frames belonging to the stream are Drop Eligible A Drop Eligible frame (or frames of a Drop Eligible stream) might be dropped from further processing if the device has insufficient resources (determination of insufficient resource condition is out-of-scope) Questions: What does Drop Eligibility mean? Should DEI be represented in Figures 5-1 and 5-2? 9.2.4.6.2, Submission Slide 2 Ganesh Venkatesan (Intel Corporation)
May 2016 doc.: IEEE 802.11-16-0713r0 What does Drop Eligibility mean? Under Insufficient Resources conditions: 1. Drop the received frame (but still acknowledge it, if it needs to be acknowledged) 2. Drop the frame from the transmit path 3. Do either of the above depending on when the Insufficient Resources condition occurs Option 3 is probably the right one Submission Slide 3 Ganesh Venkatesan (Intel Corporation)
May 2016 doc.: IEEE 802.11-16-0713r0 Where does DEI belong? Do we need to include DEI in Figure 5-1 and Figure 5-2? If so, where should DEI be in the Tx path and in the Rx Path Packet Number Assignment Replay Detection (optional) SYNRA Receiver Filtering (Cl. 9.42) Block Ack Buffering and Reordering MPDU Encryption (Tx)/Decryption(Rx) and Integrity (optional) Duplicate Detection Scoreboarding Null Address 1 address filtering Submission Slide 4 Ganesh Venkatesan (Intel Corporation)
May 2016 doc.: IEEE 802.11-16-0713r0 Backup Submission Slide 5 Ganesh Venkatesan (Intel Corporation)
May 2016 doc.: IEEE 802.11-16-0713r0 DEI Processing 10.3.2.9 Ack procedure has the note below: NOTE 2 The receiver STA performs the Ack procedure on all received frames requiring acknowledgment, even if an MSDU or A-MSDU is carried partly or wholly within the frame and is subsequently discarded due to drop eligibility (see DEI subfield in 9.2.4.5 (QoS Control field)) 9.2.4.6.2 HT Variant has the following: The DEI subfield of the HT Control field(Ed) is 1 bit in length and is set by the transmitting STA to indicate the suitability of the corresponding MSDU or A- MSDU to be discarded if there are insufficient resources at the receiving STA. If there are insufficient resources, a STA that receives an MPDU whose DEI subfield is equal to 1 carrying all or part of an MSDU or A-MSDU should discard the MSDU or any MSDUs contained within the A-MSDU in preference to MSDUs carried in MPDUs whose DEI subfield is equal to 0. See 11.27.2 (SCS procedures). In an MMPDU, the DEI subfield is reserved. The mechanisms for determining whether the resources are insufficient or when to discard MSDUs or A-MSDUs are beyond the scope of this standard. Submission Slide 6 Ganesh Venkatesan (Intel Corporation)
