Questions of SAP "MIH_Link_Actions.request"
Hello everyone,
I have just reviewed the standard "IEEE P802.21/D10.0", and the
questions I mentioned in D9.1 still exist, so I repeat my questions
again with new index of D10.0:
The SAP "MIH_Link_Actions.request" has 2 entries: (MIHF_ID and
LIST(LINK_ACTION_REQ)).
According to Table C-4, LINK_ACTION_REQ is derived from
SEQUENCE(LINK_ID, CHOICE(NULL, LINK_ADDR), LINK_ACTION,
LINK_AC_EX_TIME).
LINK_ACTION is derived from SEQUENCE(LINK_AC_TYPE, LINK_AC_ATTR),
their definitions are listed in
Table C-5 and C-6 respectively.
Let's take a look at the flow chart in page.277, 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.279, 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 link wasn't powered up until this SAP had been generated, then how
can we do "LINK_SCAN" in the MIH_Link_Actions.request in page.277? It
looks like the link wasn't "powered up" in page.277.
Should we modify the definitions of "4: LINK_POWER_UP" and add a new
definition "5: CONNECT" for LINK_AC_TYPE in Table C-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.
Thank you for your attention, I am looking forward to receiving your reply.
Sincerely yours,
Shunneng Yang
Software Engineer
Information and Communication Research Labs, ITRI
Tel. : +886-3-591-2286 (O)
E-mail: aaroh0407@gmail.com