Re: [STDS-802-16] Broadcast
Eyal,
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.
Vladimir
-----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
Eyal
-----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.
Any comments ?
Regards,
-Raja
-----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.
Regards
Eugene Crozier
-----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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