Re: [STDS-802-16] Broadcast
Dear Mr. Raja,
I perfectly understood the problem concerning the broadcast connection,
and I agree with you.
However, regarding the multicast data connection, I have not understood
yet if there is defined a special CID for multicast data and another
special CID for multicast polling?
If a CID for multicast data is defined, then the broadcast would be a
special case from this one. Resuming, is there a multicast data
connection (CID) defined in the standard?
Best Regards,
Pedro Neves
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Pedro Miguel Naia Neves
Instituto Telecomunica^Í^Ûes - http://www.av.it.pt
Aveiro - Portugal
Phone: +351 234 377 900
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Homepage: http://daidalos.av.it.pt/~pneves
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________________________________________________________________________________
From: owner-stds-802-16@LISTSERV.IEEE.ORG
[mailto:owner-stds-802-16@LISTSERV.IEEE.ORG] On Behalf Of Raja Banerjea
Sent: quarta-feira, 21 de Abril de 2004 16:52
To: STDS-802-16@LISTSERV.IEEE.ORG
Subject: Re: [STDS-802-16] [STDS-802-16] +AFs-STDS-802-16+AF0- Broadcast
Vladimir,
The problem with using broadcast CID (0xFFFF) to transmit broadcast
data is more on the receiving MAC CPS. The data received on the broadcast
CID (0xFFFF) could now be data or management. The CPS has to try to
identify the packet as a management packet based on the MAC Management
Type. If the type is invalid then it could be data packet and should be
passed to the CS. Further if the data packet wrongly included the first
byte equal to the MAC Management Type, a broadcast data packet would be
understood by the receiving MAC CPS as a MAC management message. This is
not a good solution.
I therefore feel broadcast CID should only be used to broadcast MAC
Management messages.
As Radu and Eyal suggested broadcast of data packets is a special case
of multicast data connection (not to be confused with multicast polling)
where all the SS are part of the multicast group.
Regards,
-Raja
-----Original Message-----
From: Vladimir Yanover [mailto:vladimir.yanover@ALVARION.COM]
Sent: Wednesday, April 21, 2004 4:09 AM
To: STDS-802-16@listserv.ieee.org
Subject: Re: [STDS-802-16] +AFs-STDS-802-16+AF0- 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."&+nbsp;
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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