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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
Mobile: +351 96 618 75 82
Homepage: http://daidalos.av.it.pt/~pneves
MSN contact: etneves@hotmail.com
 

________________________________________________________________________________
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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