Re: [802.21] Two Questions of standard IEEE P802.21/D9.1
Shunneng Yang,
First 802.21/D9.1 was an interim version. It was a version generated
from D9.0 with only some of the comments received from the Sponsor
Ballot D9.0 applied. Therefore it does not surprise me that you have
questions/problems with it.
David Cypher
===================
At 09:13 AM 4/30/2008, Shun-Neng Yang wrote:
>Hello everyone,
>
>I am new here. Recently, I studied standard "IEEE P802.21/D9.1", and
>I have two questions to ask:
>
>Q1. The SAP "MIH_Link_Actions.request" has 2 entries: (MIHF_ID and
>LIST(LINK_ACTION_REQ)).
>
>According to Table B-4, LINK_ACTION_REQ is derived from
>SEQUENCE(LINK_ID, CHOICE(NULL, LINK_ADDR), LINK_ACTION,
>LINK_AC_EX_TIME), and LINK_ACTION is derived from
>SEQUENCE(LINK_AC_TYPE, LINK_AC_ATTR), their definitions are listed in
>Table B-5 and B-6 respectively.
>
>Let's take a look at the flow chart in page.270, here the
>SEQUENCE(LINK_AC_TYPE, LINK_AC_ATTR) in MIH_Link_Actions.request
>should be (0: NONE, LINK_SCAN), is it right?
>If it is, then in page.271, what is the content of
>SEQUENCE(LINK_AC_TYPE, LINK_AC_ATTR) in MIH_Link_Actions.request?
>If the SEQUENCE here is (4: LINK_POWER_UP, DATA_FWD_REQ), then why the
>link is "powered up" here?
>If it isn't powered up, then how can we do the "LINK_SCAN" in the
>MIH_Link_Actions.request in page.270?
>
>Should we modify the definitions of "4: LINK_POWER_UP" and add a new
>definition "5: CONNECT" for LINK_AC_TYPE in Table B-5?
>Then the definitions of LINK_POWER_UP and CONNECT may be "Turn on the
>radio and cause the link to power up" and "Establish L2 connectivity"
>respectively.
That was four versions ago. Text and figures have changed. I do not
think that your comment exists in the latest draft.
>Q2. The SAP "Link_Up.indication" has 5 entries: (LinkIdentifier,
>OldAccessRouter, NewAccessRouter, IPRenewalFlag, Mobility Management
>Support).
>
>Although the 4 entries (OldAccessRouter, NewAccessRouter,
>IPRenewalFlag, Mobility Management Support) are optional, they are
>layer-3 parameters. This indication is generated by layer-2, then
>should these 4 entries be listed here?
The OldAccessRouter and NewAccessRouter are link-layer addresses, not
layer-3 addresses.
As for the other two IPRenewalFlag and Mobility Management Support,
this information may be available to the link-layer. For example
through beacon messages.