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the 42 in case of Broadcasting only (as far as the Phy) From: Youssef Abdelilah [mailto:youssefa@EARTHLINK.NET] Sent: Thursday, March 16, 2006 5:23 PM To: STDS-802-16@LISTSERV.IEEE.ORG Subject: [STDS-802-16] FW: [STDS-802-16] questions regarding 802.16e WMAN-OFDMA? Dear
all, Target
System: WMAN-OFDMA with 10 MHz bandwidth, frame period of 5 ms, TDD mode, 1024
fixed FFT points, and 42 symbols in a frame. Questions: 1. The
sizes for DL subframe and UL subframe in one TDD frame are supposed to be given
to PHY layer from the above layer (it is written in the spec); what is the worst
case for the DL subframe size. In other words, among 42 symbols in a frame what
would be the largest number of symbols that can be assigned to DL subframe.
2. The
largest and smallest time for RTG (Receiver - Transmitter Gap) between two
consecutive frames. 3. Each SS
(Subscriber Station) or MS (Mobile Station) have to process only specific DL
bursts (i.e, not all DL bursts)? -- If so,
what parameters that PHY can expect from the above layer and also, what are the
range of the parameters? 4. In each
DL_MAP_IE of WMAN-OFDMA, information of the size and the location of each
logical DL burst are provided as following 4 parameters, 'OFDMA_Symbol Offset',
'subchannel offset', 'No. OFDMA symbols', and 'No. subchannels'. Though it's not
clear, we assume that 'No. subchannels' indicates the number of subchannels
corresponding to one symbol (i.e., not whole number of subchannels in a burst).
What is the maximum value of those parameters for the system we described
above? The problem
that I see is that if we take the maximum as the largest number from the bits,
one DL burst can take whole frame. Thus, I am wondering if there is any rule to
regulate the burst size beyond those parameter expression.
5. (This
question is somewhat related to the question 3 & 4) Is it possible that
whole DL subframe can be assigned to a single user? If so, the whole information
for the single user can be put into one single burst or have to be in
multi-bursts? Thank you, Youssef
Abdelilah |