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All,
I am seeking clarification regarding the use of Fast Power Control (FPC) MAC message introduced in Amendment 3 of 802.16. I would appreciate any additional information, correction or explanation for the following statements. The statements below seek to improve the efficiency of the FPC scheme. Who is the main contact member for matters of power control?
Thanks for the help.
Regards,
Paul.
paul.piggin@radiantnetworks.co.uk
System Architect,
Radiant Networks plc, The Mansion, Chesterford Park, Little Chesterford, Essex, CB10 1XL. UK.
Tel: 01799 533600 Fax: 01799 533601
~
* Where does the FPC MAC message make a decision regarding power changes at the SS?
* Can these measurements be derived from local measurements made via the PHY SAP, for example using the RXSTART PHY SAP parameter?
* Is it appropriate to make power control decisions based on CINR rather than RSSI? This will be managed together with the "burst profile format management" procedure.
*Within the FPC MAC message is it more appropriate to include a power change up/down/no change indication rather than including the whole power level in dBm? This will reduce the size of the FPC message which is an advantage as the message will be sent frequently.
Concerning downlink power control (mandated for use in some unlicenced markets):
* Downlink power control can be accomplished in a similar manner to uplink power control.
* Measurements of downlink power from the BS can be monitored at the SS via the PHY SAP. A RNG-RSP type MAC message can be sent from each SS to vary the BS output power for its particular downlink data burst.
*Amendments to the RNG-RSP type message include a power change up/down/no change indication and the removal of some of redundant TLVs. This is appropriate for the TDMA portion of the downlink only.
PHY SAP specifications seem to be missing for PHYs other than SC in the D0 version of the 802.16 standard.