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Hi,
I
recommend you to re-read the relevant text from the
standard.
UCD/DCD and MAP messages are not
related.
The
specific fields you mentioned defines the contention behavior limits, i.e. for
an SS starting contention to know with which backoff parameter to start and what
its backoff limit. Each SS will have different backoff value according to its
contention status. The slots allocated for contention are published in the UL
MAP and are used to count opportunities for the backoff
behavior.
So, the DCD/UCD are (long) periodic
general DL/UL control messages.
Itzik.
Hi LEE,
Thanks for your
prompt reply.
I accept DCD/UCD
messages are transmitted by a pre-determined period of time (max of 10
sec).
Let us assume a
condition that the MAP messages change continuously whenever the DL sub frame
period starts. In this case the UCD frame should also accommodate DL-MAP and
UL-MAP as UCD frame contains some field called RNG
Back off start, RNG
Back off end, Request back off start and Request back off end which contains the
contention window size details and these contention window details will vary
from one cycle (i.e. combination of DL/UL sub frame) to another
cycle.
So at least UCD message should accommodate the MAP messages (considering
DCD message is not altered) in every DL sub frame transmitted. I am right???If I
went wrong any where please correct me.
Plz Reply.
Thanks in advance
Vasanth
----- Original Message -----
Sent: Thursday, August 17, 2006 12:36
PM
Subject: Re: [STDS-802-16]
scanning..
Hi, All
1. DCD & UCD must be sent periodically using
constant according to Table 342.
2. DL-MAP, UL-MAP shall be sent whenever the
maps are changed.(See 8.3.5.1)
In fact, DCD & UCD are the specifications of
the channel(time and frequency).
DL-MAP, UL-MAP are chanel assignment structure
and they are more adaptive
to the change of service Qos. If you see
that "Lost DL-MAP Interval" is shorter
than DCD Interval, you may get some
idea.
OK?
----- Original Message -----
Sent: Thursday, August 17, 2006 2:31
PM
Subject: [STDS-802-16] scanning..
Hi all,
I have some doubt in scanning and obtaining UL parameters in
SS.
In 802.16-2004 STD page no 173 under,
6.3.9.4 Message flows during
scanning and uplink parameter acquisition
It’s
given how the BS generates UCD, DCD, DL-MAP, UL-MAP messages at period
interval within the range defined in table 342 in STD and the above said
message flow is described in table 114.
I will come to my question now; when
the DL period starts whether the DL burst-1 should contain all the control
information (UCD, DCD, DL-MAP and
UL-MAP) or will it contain only DL-MAP and UL-MAP.
To be clear when every time the
DL period starts, the BS should transmit all the control messages (UCD, DCD, DL-MAP and UL-MAP) in
the DL burst-1 frame????
I was confused after seeing the
table 114 in the STD. It’s given that clock time to send DL-MAP message
comes often when compared to other control messages.
Plz clear my
doubt.
Thanks in
advance.
Regards
Vasanth
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