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Re: [STDS-802-16] Downlink power control & link level performance - 802.16e ?

Dear Dr Darcy Poulin,

Does that mean that a user will have better coverage at the cell edge when BS dynamically switch from FUSC to PUSC since the number of channels are less now but the same amount of BS TX power is distributed to these channels ? Just to confirm that ;-).

Thanks again for your help.

Regards,
Arthur.


On 3/15/06, Darcy Poulin <dp@sige.com> wrote:
Good question. The SS can not make any power control requests to the BS, so the DL power control will be completely different, as there is no closed loop control.
 
As far as I know, the BS will not adjust its Tx power. The standard calls for only 10 dB dynamic range in the BS, but I don't think it will adjust its transmit power. If subchannelization is used, there is no way it could, since it has to be able to transmit at sufficient power to hit SS's that are both close-in and far away within the same frame.
 
I think that the large Rx dynamic range of the SS is sufficient to allow both close in and far away SS's to receive the BS signal without any BS transmit power control.

From: Arthur Liew [mailto:geniusbb@gmail.com]
Sent: Wednesday, March 15, 2006 7:07 AM
To: Darcy Poulin
Subject: Re: [STDS-802-16] Downlink power control & link level performance - 802.16e ?

Dear Dr Darcy Poulin,

Just wish to say thanks for you helpful comment. I have one final question regarding first question though. Is the same technique used for downlink power control too ? Do we do a link budget and use fixed power or adapt power dynamically accordingly in the downlink ?

Thanks for reading this email. Your help have been helpful.

Regards,
Arthur.

On 3/14/06, Darcy Poulin <dp@sige.com> wrote:
Regarding 1, the BS will adjust all SS power levels so that the power at the BS is nominally the same from all SS's. It will adapt the MCS accordingly. This is done to minimize requirements of dynamic range on the BS.
 
For question 2, see the contribution on the 802.16 server at http://www.ieee802.org/16/maint/contrib/C80216maint-05_112r8.pdf . It shows BER vs. SNR for different modulation schemes in figure 1.
 

Dr. Darcy Poulin
Sr. Systems Engineer
SiGe Semiconductor
2680 Queensview Drive
Ottawa, ON, Canada K2B 8J9
dp@sige.com
613-820-9244 x274


From: Arthur Liew [mailto:geniusbb@GMAIL.COM]
Sent: Tuesday, March 14, 2006 3:28 PM
To: STDS-802-16@LISTSERV.IEEE.ORG
Subject: [STDS-802-16] Donwlink power control & link level performance - 802.16e ?

Dear All,

Hi, my questions are:

1.  What is the typical power control technique for 802.16e ? Adapt power so that Equal SINR for each user is achieve or distrbute power equally to each channel but adapt the MCS accordingly ?

2.  Is there any link level performance mapping table available for system level simulation on 802.16e ? More clearly, is there a table that illustrates the require SNR for a given modulation and coding scheme at a certain BER ?

Hear from you guys again. Thanks !

Regards,
Arthur.
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**************************************************************************************

SiGe's Ottawa office is moving to a new expanded facility.

From March 27, 2006 our address will be:
1050 Morrison Drive, Suite 100
Ottawa, Ontario Canada K2H 8K7
Phone and fax numbers are unchanged.

**************************************************************************************

This message contains confidential, proprietary or trade secret information of SiGe Semiconductor, Inc. No confidentiality or trade secret status is waived or lost by any error in transmission. If you receive this message in error, please immediately delete it and all copies of it from your system, destroy any hard copies of it and notify the sender. If you are not the intended recipient, please do not use, disclose, distribute, print or copy any part of this message.