1. Clarification on CID3778 and Mesh TIM element
February 2007
Clarification on CID3778 and Mesh TIM element
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Kazuyuki Sakoda

2. February 2007
Abstract
Recall the intention of CID3778. (the need of AID value assignment)
CID3778 relates to Mesh TIM story.
Two options will be presented.
Kazuyuki Sakoda

3. February 2007
CID3778
CID3778 originally suggests to assign unique AID value per neighboring MPs, and report it via AID field in association response frame.
AID value is tied with Traffic Indication Map in TIM element.
AID value points the “Associate Bit” in Traffic Indication Map, thus AID value needs to be larger than 1 and smaller than 2008, according to the base standard.
Ad-hoc meeting member suggested to reject this CID.
Resolution notes: Clause 11A.1.5 describes PeerLinkID and LocalLinkID as unique identifiers for a peer link. These values are used instead of the AID value, so there is no need to implement the change suggested by the commenter.
Kazuyuki Sakoda

4. February 2007
CID3778 (Cont’d)
PeerLinkID and LocalLinkID consist of 32 bits generated randomly.
1-32^2 = 4,294,967,295 in decimal expression.
Very large bit map is necessary for Traffic Indication Map, if we only use PeerLinkID or LocalLinkID for this purpose, assuming to reuse the TIM element format for Mesh TIM operation.  CID3778 suggested to assign AID value.
Kazuyuki Sakoda

5. February 2007
However...
PeerLinkID and LocalLinkID seem to be necessary to identify neighboring MPs.
So... There could be two options regarding these issues.
Kazuyuki Sakoda

6. February 2007
Option 1
Assign AID value (0<AID<2008) and report it, as suggested by CID 3778.
Pros:
Mesh TIM element format can be maintained from the base standard.
Mesh TIM element length could be small.
Cons:
MP needs to handle AID value in addition to PeerLinkID and LocalLinkID, in terms of neighboring MP identification.
Kazuyuki Sakoda

7. February 2007
Option 2
Do not utilize AID value for neighboring MP identification, and define a “new” Mesh TIM format.
Pros:
MP does not need to handle AID value in addition to PeerLinkID and LocalLinkID, in terms of neighboring MP identification.
Cons:
Mesh TIM element format can not be maintained from the base standard.
Mesh TIM element length could be longer.
Kazuyuki Sakoda

8. Option 2 (Cont’d) Conventional TIM element format
February 2007
Option 2 (Cont’d)
Conventional TIM element format
Set a bit (associated with AID) to 1, if MP has a buffered traffic
“New” Mesh TIM element (just an example):
Include PeerlinkID within the TIM element, if MP has a buffered traffic.
Figure S35: Mesh TIM element
Kazuyuki Sakoda

9. February 2007
Next step
Would like to receive feedback from TGs members, so that submission text could be ready before the Orlando meeting.
So far, Mesh TIM submission text is written based on the Option 1. (New format potentially results in beacon bloat.)
Further suggestions are welcomed.
Kazuyuki Sakoda