Re: [STDS-802-16] +AFs-STDS-802-16+AF0- +-AFs-STDS-802-16+-AF0- Broadcast

[Raja Banerjea <RBanerjea@PROXIM.COM>]

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