The draft does not specify one broadcast
and one multicast connection for sending data from the BS to the SS’s?
As Vladimir
said, multicast polling groups are used, but what about data transfer from the
BS to the SS’s? I thought CIDs were allocated for this type of
transmissions.
Regards,
Pedro Neves
From:
owner-stds-802-16@listserv.ieee.org
[mailto:owner-stds-802-16@listserv.ieee.org] On
Behalf Of Vladimir Yanover
Sent: quarta-feira, 21 de Abril de
2004 12:06
To: STDS-802-16@listserv.ieee.org
Subject: Re: [STDS-802-16]
Broadcast
Seems that the standard does not preclude
from sending data over broadcast connection. Another question is
whether
we may establish a service flow associated
with broadcast connection. I think, we cannot, then there is no
way
for data entering CS SAP to be routed
to broadcast connection.
By the way, multicast connections are not
related to multicast [polling] groups.
-----Original Message-----
From: Eyal Verbin
[mailto:everbin@AIRSPAN.COM]
Sent: Wednesday, April 21, 2004
1:39 PM
To: STDS-802-16@LISTSERV.IEEE.ORG
Subject: [STDS-802-16] Broadcast
Section 6.1 of
the standard states that " In addition to individually addressed messages, messages may also
be sent on multicast connections (control messages and video distribution are
examples of multicast applications) as well as broadcast to all stations."
Correct me if
I'm wrong, but broadcast transmission is limited to MAC management messages
(MAPs, DCD,...) and can't be used to transfer data. Therefore, the only way to
broadcast data is to form a multicast group containing all SS's
-----Original Message-----
From:
owner-stds-802-16@listserv.ieee.org
[mailto:owner-stds-802-16@listserv.ieee.org]On
Behalf Of Don Leimer
Sent: Monday, April 19, 2004 8:26
PM
To: STDS-802-16@listserv.ieee.org
Subject: Re: [STDS-802-16]
Clarification regarding SS power level control
Only one more comment. The final 4dB
of error will also be reduced by subsequent BS commands, and relative error
diminishes to +/- 0.5dB for the final error (relative to the BS's capability to
measure power)
-----Original Message-----
From: Raja Banerjea
[mailto:RBanerjea@PROXIM.COM]
Sent: Monday, April 19, 2004 9:14
AM
To: STDS-802-16@LISTSERV.IEEE.ORG
Subject: Re: [STDS-802-16]
Clarification regarding SS power level control
The power control method is a closed loop
method where the Base station asks for further power control corrections if
required. If the base station requests the subscriber station in the RNG-RESP
to increase the power level by 30dB the SS should increase it by 30dB with a
relative accuracy of 4dB.
If the Base station is going to increase
the power of the SS in 5 steps and the BS requests the SS to
increase the power by 8dB the SS will increase it by 8dB with a relative
accuracy of 4dB. In the subsequent RNG-RESP message the BS instead of
requesting a power increase of 8dB will request for 8dB+(relative accuracy).
Therefore after each increase requested from the BS the relative accuracy should
be 4dB.
This assumes that the BS can make an
accurate measurement of the SS's power increase.
-----Original Message-----
From: Crozier, Eugene
[mailto:Eugene_Crozier@SRTELECOM.COM]
Sent: Monday, April 19, 2004 6:26
AM
To: STDS-802-16@listserv.ieee.org
Subject: Re: [STDS-802-16]
Clarification regarding SS power level control
My understanding of this
is that the step size should be greater than 1 dB but less than 8 dB (I'd
assumed for the relative accuracy that the 50% of the step size can be no
more than 4 dB), but the number of steps is based on the step size and the
relative accuracy to achieve the minimum control range, so for 1 dB steps, the
number of steps can be between 60 and 20 (30/0.5 and 30/1.5) for a 30 dB range,
and for 8 dB step size the number of steps between 8 and 3 for the 30 dB range.
-----Original Message-----
From: Eyal Verbin
[mailto:everbin@AIRSPAN.COM]
Sent: Monday, April 19, 2004 8:22
AM
To: STDS-802-16@listserv.ieee.org
Subject: [STDS-802-16]
Clarification regarding SS power level control
Power level
control for the OFDM PHY is defined in section 8.3.9.1:
" For
an SS not supporting subchannelization, the transmitter shall support a
monotonic power level control of 30 dB minimum. For an SS supporting
subchannelization, the transmitter shall support a monotonic power level
control of 50 dB minimum. The minimum step size shall be no more than 1 dB. The
relative accuracy of the power control mechanism is +/-50% of the step size in
dB, but no more than 4 dB. As an example, for a step size of 5 dB the relative
accuracy is 2.5 dB. For a BS, the transmitter shall support a monotonic power
level control of 10 dB minimum."
Looking at the SS (subchannelization)
for example, it is possible to go from Min power to Max power either in 5 steps
of 8 dB or in a single step of 50dB. In the first option the accumulated offset
can reach 5*4dB (20dB) wheras in the second option the tolerance is limited to
4dB.
Does anyone have a more clear interpretation
of this text?
Eyal Verbin
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