CID 4341 asks what parameters of a block
ack agreement can be modified.
If you have any answers to the questions highlighted in cyan below, or
any other thoughts on the matter, please do respond!
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Identifiers |
Comment |
Proposed change |
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CID 4341 Mark RISON 10.25.2 |
9.6.4.1 says "When Block
Ack operation is modified, only the timeout can be changed." but 10.25.2 says "All parameters of the agreement may be changed except for the TID." and 11.5.1 says something similar |
Decide one way or the other.
If buffer size and timeout can be changed, describe what happens if the new values are smaller than the current, and the current window/idle time exceed the new limits [needs discussion] |
Discussion:
We currently have:
9.6.4.1 Block
Ack Action field(#3729)
ADDBA Request and ADDBA Response frames are used to set up or to modify block
ack operation(#3518) for a specific TC, TS, or GCR group address. (#3172)When Block
Ack operation is modified,
only the timeout can be changed.
10.25.2 Setup and modification of the block
ack parameters
(#1807)A block ack agreement may be modified by the originator by sending an ADDBA Request frame ((#3174)see 11.5.2 (Setup and modification of the block
ack parameters), except that MLME-ADDBA primitives are not used).
All parameters of the agreement may be modified except for the TID.
11.5 Block
ack operation
11.5.1 Introduction
(#3174)Block ack agreements may be set up, modified by the originator, or deleted from the MAC (see 10.25.2 (Setup and modification of the block
ack parameters)) or from the SME. The setup, modification by the originator and deletion of block
ack agreements from the SME is described in this
subclause. All parameters of an agreement may be modified except for the TID.
An ADDBA Request frame is defined in Table 9-445—ADDBA Request frame Action field format and contains the following fields:
Block Ack Parameter Set, which contains A-MSDU Supported, Block
Ack Policy, TID and Buffer Size subfields
Block Ack Timeout Value
Block Ack Starting Sequence Control, which contains a SSN
GCR Group Address element (optional), which contains a GCR group address
Multi-band (optional), which contains loads of stuff
TCLAS (optional), which contains loads of stuff
ADDBA Extension (optional), which contains No-Fragmentation and HE Fragmentation Operation subfields
EDMG Flow Control Extension Configuration (optional), which contains loads of stuff
SAR Configuration (optional), which contains quite a lot of stuff
Q1: is it really OK for all of these to be modified?
E.g. change A-MSDU support or GCR address or TCLAS or fragmentation or Multi-band/EDMG/SAR
config?
An ADDBA Response frame is defined in Table 9-446—ADDBA Response frame Action field format and contains the following fields:
Block Ack Parameter Set
Block Ack Timeout Value
GCR Group Address element (optional)
Multi-band (optional)
TCLAS (optional)
ADDBA Extension (optional)
EDMG Flow Control Extension Configuration (optional)
SAR Configuration (optional)
Originator Preferred MCS element (optional)
Q2: is it really OK for all of these to be modified, even if not modified in the request (either w.r.t. the original request, or the original response)?
Q3: even if we focus on the “core” parameters, i.e. timeout and buffer size, what if the new values are smaller than the current values, i.e. there
has been no traffic for more than the new timeout, or the new buffer size is smaller than the current outstanding window size?
Thanks,
Mark
--
Mark RISON, Standards Architect, WLAN English/Esperanto/Français
Samsung Cambridge Solution Centre Tel: +44 1223 434600
Innovation Park, Cambridge CB4 0DS Fax: +44 1223 434601
ROYAUME UNI WWW:
http://www.samsung.com/uk
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