RE: stds-802-16-mac: the top of the 802.16 reference model
Stanley,
I posted your picture <http://ieee802.org/16/tg1/temp/scope.pdf>. I
think the idea has potential, but I don't think the picture addresses
my questions. Regarding my question (1), I agree that 802 splits DLC
into LLC and MAC, but I don't think that "ATM does somehow correspond
to (at least) part of the ISO's Data Link Layer." Regarding Question
(2), I don't see how your picture can touch on the issue because
there is no LCC in your figure.
Roger
>Hi Roger,
>
>I tried to draw a picture to show the relationship between IEEE 802.16 and
>other protocol (e.g., higher-layer protocols). The attached figure was
>submitted but was not accepted due to details on what protocol we should use
>for signaling, for example. The aim of the figure is to answer the type of
>question you have asked.
>
>IEEE 802.16's MAC layer is not corresponding to ISO's Data Link Layer. In
>my figure, it seems to suggest that IEEE 802.16 MAC and PHY corresponding to
>ISO's Physical Layer. That is not true either. In my figure, I was trying
>to focus on the "convergence sublayer," since the figure was used to support
>our contribution on Convergence Sublayer, and ATM protocol is on top of ATM
>Convergence Sublayer.
>
>Here is my two cents. The "Other Upper Layers" refers to "upper" layer in
>respect to IEEE 802.16 MAC layer instead of ISO's Data Link Layer. As you
>can see from my drawing, ATM is an "upper" layer from IEEE 802.16 MAC point
>of view. However, ATM does somehow correspond to (at least) part of the
>ISO's Data Link Layer. Please recall that ISO's Data Link Layer includes
>Logical Link Control and Medium Access Control Sublayers.
>
>So, I believe both Figures 1 & 2 are correct. However, the role of (or the
>boundary of) DLL in IEEE 802.16 is not very clear at all. It depends on the
>"upper" layer protocol that IEEE 802.16 serves.
>
>Hope this helps,
>Stanley
>
>
>
>-----Original Message-----
>From: Roger B. Marks [mailto:marks@boulder.nist.gov]
>Sent: Monday, March 26, 2001 3:09 PM
>To: stds-802-16-mac@ieee.org; stds-802-16-tg1@ieee.org
>Subject: stds-802-16-mac: the top of the 802.16 reference model
>
>
>I am trying to figure out some things about Fig. 1 in the TG1 draft.
>
>(1) Why is "Other Upper Layers" shown to be part of the Data Link
>Layer? This makes no sense.
>
>(2) If we make "Other Upper Layers" horizontal and lay it above LLC,
>then we have a more normal 802 diagram. On the other hand, we will be
>saying that our MAC talks upper layers only through LLC. On the other
>hand, Figure 2 suggests that our MAC talks to upper layers directly,
>not through LLC. That agrees with Clause 5 (e.g, "The ATM Convergence
>Sublayer (CS)... accepts ATM cells from the ATM layer"). So, what is
>the role of LLC in 802.16?
>
>Roger