[STDS-802-16] clarification needed on definition of min and max values for Allocation Start Time field.

[gundlapalli giridhar <girigold@YAHOO.COM>]

Hi,

Please go through the following lines and
correct me if my understanding is wrong.

The following sub-section of the std defines the
allocation start time field min and max values:

6.3.7.5.2 WirelessMAN-SCa PHY
TDD, the Allocation Start Time value shall be to the
following limitations:
— Minimum value: Allocation Start Time > Tf
— Maximum value: Allocation Start Time < 2 X Tf

where, Tf  is the beginning of the next frame.

----------------
My understanding:

The Allocation Start Time is related to the UL
sub-frame in TDD operation. The definition of its
value should be w.r.to the start of UL sub-frame in
the current (minimum time relevance) or next frame
(maximum time relevance). 

Hence the min and max values are to be: 

Minimum time relevance:
— Minimum value: Allocation Start Time >= FCH offset 
(UL-MAP may commence immediately after the FCH when
there is downlink data i.e. data DL-MAP IEs)
— Maximum value: Allocation Start Time <  
frame_duration

Maximum time relevance:
— Minimum value: Allocation Start Time >=
frame_duration (UL-MAP starts in the next frame)
— Maximum value: Allocation Start Time < (2 X
frame_duration)

The point is the UL-MAP has to end in the frame in
which its allocation starts, i.e. 
- in miminum time relevance case, the start and end
happens in the current frame and 
- in maximum time relevance case, the start and end
happens in the next frame.

The pictorial representation in earlier version of
standard was to this extent.

Thanks for your time,
-Giridhar.


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