Re: [STDS-802-16] doubt in WiMAX OFDM - plz help
Sabari,
Please find my comments below
Vladimir
> -----Original Message-----
> From: Sabarinathan Nagarajan [mailto:sabari_tce@YAHOO.COM]
> Sent: Friday, February 25, 2005 2:20 PM
> To: STDS-802-16@LISTSERV.IEEE.ORG
> Subject: [STDS-802-16] doubt in WiMAX OFDM - plz help
>
>
> hi,
> I am working in WiMAX MAC as a part of my Post
> Graduate studies in India.
> I would like any one of you to clear my doubts
> thanks in advance
>
> In WiMAX OFDM, there are two types of REQ regions in
> a frame. These are REQ Region FULL and REQ Region
> Focused.
>
> i have understood REQ Region Focused in that a SS
> shall send a short code over a TO that consists of
> four subcarrier by two OFDM symbols.
>
> my doubts are :
> 1) what will be transmitted in that so that BS shall
> get the channel index etc. is there any format for
> that mentioned in the standard?
Certain code should be transmitted at certain channel. BS has to receive all
codes transmitted by many
SSs at different channels [there is a possibility for collision]
>
> 2) What is that REQ Region FULL? also when to decide
> which REQ to choose?
REQ Region Full is an allocation at UL [provided over UL-MAP] used by
different SSs for transmission of
Bandwidth Request Headers, potentially with collisions [each SS is choosing
for transmission a random slot within the allocation ].
> 3) What are all those burst profiles (UIUC = 5-12) on
> (page 468 in the 2004 edition) used for?
This UIUC values are used mark different options for modulation/coding used
further in UL-MAP
what is the
> format for that?
UIUC has 4 bits
is it a grant IE?
UIUC are used in UL-MAP IEs (Table 245); one may call them "Grant IE"
[actually this term is not used in OFDM]
>
> 4) if subchannelization is used, then why not
> different SSs transmit with different subchannel index
> in the same burst?
The standard does not preclude from allocating several UL bursts to a single
SS
[in this case several UL-MAP IEs contain same CID = Basic CDI of the SS]
>
> plz help me in clearing these doubts
> bye
> sabari
>
>
>
>
>
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