[STDS-802-16] AW: [STDS-802-16] Transmitted power during initial ranging
Dear Giulio,
in 802.16-2004 there is a statement:
The SS shall calculate the maximum transmit signal strength for initial
ranging,
PTX_IR_MAX, from equation (10)
PTX_IR_MAX = EIRxPIR,max+ BS_EIRP - RSS (10)
EIRxPIR,max (from DCD):
Initial Ranging maximum equivalent isotropic received power at BS
Signed in units of 1 dBm. (Table 358, Cor1 D2)
BS_EIRP is the equivalent isotropic radiated power of the base station
RSS is level at SS
as you maybe always know.
My interpretation is that using the same RF channel for uplink
a link loss was determined using RSS and will limit the maximum transmit
power of the SS to do not "overload" the IR receive level at the BS.
To "adjust" its power level, to my understanding is to adapt to the link
loss.
The wording of max TX power is from a viewpoint of the BS.
Kind Regards
Juergen Otterbach
> -----Ursprüngliche Nachricht-----
> Von: Cavalli Giulio [mailto:Giulio.Cavalli@SIEMENS.COM]
> Gesendet am: Dienstag, 26. April 2005 19:36
> An: STDS-802-16@LISTSERV.IEEE.ORG
> Betreff: [STDS-802-16] Transmitted power during initial ranging
>
> The algorithm for initial ranging has been changed in
> Corrigendum draft
> D2.
> In D2 the SS starts to transmit at a power level below
> PTx_IR_MAX. Than
> if the SS "does not receive a response, the SS shall resend
> the RNG-REQ
> at the next appropriate Initial Ranging transmission opportunity and
> ADJUST ITS POWER LEVEL" (page 36, line 20 of D2). It's left to the SS
> the decision to increment or decrement the power.
>
> The question is: which is the maximum power the SS can
> transmit? Can the
> SS increase the transmitted power, during initial ranging, above the
> PTx_IR_MAX?
> If no: Why this limitation? (it means that the SS cannot
> transmit at its
> maximum power)
> If yes: why this parameter is defined as "the maximum transmit signal
> strength for initial ranging"? Should we change the parameter name?
>
> Regards
> Giulio
>
> ____________________________________
>
> Ing. Giulio Cavalli
>
> Siemens Mobile Communications S.p.A.
> System Engineer
> Radio Networks - R&D
> S.S.11 Padana Superiore Km. 158
> 20060 - Cassina de' Pecchi (Milano) - Italy
> Tel: +39 02 2437 6380
> Fax: +39 02 2437 6726
> e-mail: giulio.cavalli@siemens.com
> ____________________________________
>