Anonymous
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Nov 25, 2013
10:05 AM
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Nov 25, 2013
10:05 AM
How can a customer control the TX power of the radio?Is this part of the WICED Wi-Fi Driver? Given PA power dominates power draw during transmit, for battery powered applications adjusting TX power can increase battery life.Ive looked for TX Power control and related [e.g. RSSI] in WICED/SDK, but havent found much.Thanks,Phil
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5 Replies
Anonymous
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Nov 25, 2013
04:07 PM
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Nov 25, 2013
04:07 PM
How about wiced_wifi_set_tx_power() ?
Anonymous
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Nov 26, 2013
10:08 AM
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Nov 26, 2013
10:08 AM
Thank you! 🙂
Anonymous
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Nov 27, 2013
09:39 PM
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Nov 27, 2013
09:39 PM
Phil, unless your app transmits a metric shedload, receive dominates power consumption by a loooooong way, NOT transmit.Power consumption is all about "integrating the area under the curve"Energy to transmit a 1ms packet at 350mW = 350uJEnergy to run a receiver for 1s at 60mW = 60mJMake sense?Plus, the power saved by dropping RF Tx power is not net necessarily that much.It depends on the class of power amplifier used.
Anonymous
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Dec 03, 2013
05:07 PM
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Dec 03, 2013
05:07 PM
Jason, thanks for that last reply. It is VERY helpful.Ive got a customer using WICED as follows.1. WICED is in AP mode2. WICED TXs a 4 byte packet to STA3. WICED RXs a 540 byte packet from STA.Steps 2 & 3 repeat so long as the WICED radio is on. This mode dominates the use case. The radio never TXs more than 4 bytes. The radio never RXs more than 540 byte packets.[ratio of TX to RX is 1 to 135 ]The thought was that given the TX is 7x the RX that turning down the power would help. [Generally the two radios are close - at arms length literally.]Ignoring whatever the WICED needs to do in STA mode, the use case mirrors what you mention i.e. RX dominates.The current solution [K60 + AR6103] has average power of 58 mA @ 3.3v. The customers goal is 1/3 better i.e. 38 mA.Most of the means to save power assume radio is STA arent they [i.e. sleep.] Given the above use case, please suggest current saving techniques. If these can be easily demonstrated to the customer, all the better.Thanks,Phil
Anonymous
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Dec 03, 2013
09:00 PM
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Dec 03, 2013
09:00 PM
There is no general powersaving techniques for an Access Point unfortunately.The AP receiver must remain on permanently to receive packets asynchronously from associated clients.The Wi-Fi Direct standard provides some powersaving techniques for a Wi-Fi Direct Group Owner.These are not currently implemented in WICED.