September 2002 Steve Pope, TISlide 1 doc.: IEEE 802.11-02/520r0 Submission Issues Related to RSSI Measurement Steve Pope Texas Instruments September.

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Presentation transcript:

September 2002 Steve Pope, TISlide 1 doc.: IEEE /520r0 Submission Issues Related to RSSI Measurement Steve Pope Texas Instruments September 4, 2002

September 2002 Steve Pope, TISlide 2 doc.: IEEE /520r0 Submission RSSI Measurement and Reporting -- Topics * Uses of RSSI in existing systems and standards * Measuring RSSI in the Receiver/Baseband Chain * Relationship of RSSI to other signal metrics

September 2002 Steve Pope, TISlide 3 doc.: IEEE /520r0 Submission Current Usage of RSSI Measurements * Channel Selection * AGC algorithms * Rate-Fallback algorithms * Optimizing equalizers/decoders * Reporting per existing standards * Proprietary Reporting

September 2002 Steve Pope, TISlide 4 doc.: IEEE /520r0 Submission Existing Standards Microsoft NDIS "The RSSI is measured in dBm... Normal values for the RSSI value are between -10 and -200" "RSSI shall be measured between the beginning of the start frame delimiter (SFD) and the end of the PLCP header error check (HEC)." "RSSI is intended to be used in a relative manner. Absolute accuracy of the RSSI reading is not specified." "RSSI indications up to 8 bits (256 levels) are supported." Describes usage of energy detection in forming CCA

September 2002 Steve Pope, TISlide 5 doc.: IEEE /520r0 Submission

September 2002 Steve Pope, TISlide 6 doc.: IEEE /520r0 Submission Receive Chain RSSI Measurements -- Issues * Radios develop RSSI signals that are useful for AGC operation, but which may not be useful or optimal for signal- strength reporting * An RSSI measurement may (either deliberately or incidentally) include adjacent channel energy * RSSI measurement will be affected by antenna switching * RSSI calculation depends on "backing out" gain ahead of the measurement, which introduces inaccuracy

September 2002 Steve Pope, TISlide 7 doc.: IEEE /520r0 Submission

September 2002 Steve Pope, TISlide 8 doc.: IEEE /520r0 Submission Possible Values to Report RSSI in dBm, referred to antenna port, and reported for: Each Identified Remote Transmitter Unidentified Transmitters / Interferers Idle Channel Condition Field Strength Excludes effect of receive antenna gain May be useful for mapping coverage area of a transmitter Observed SNR Operating Margin (rate and implementation dependent) Usable Data Rates Measurement Accuracy