[STDS-802-16] Broadcast

[Eyal Verbin <everbin@AIRSPAN.COM>]

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