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WICED Studio Wi-Fi Combo

Anonymous
Not applicable

We are working on CYW43907 Platform application development.

Evaluating the powersave mode, monitoring the Current prover.

CYW43907 shows the different Beacon reception time.

sometime, it takes around 10msec.  but other time , it takes around 1-2msec (short time !!!)

<PS1> allways 10msec

ps1.jpg

<PS2> allways  1-2msec

ps2.jpg

<PS3> conbination of 10msec and 1-2msec

ps3.jpg

Is there any reason why?

We need to know why it behave like this.

In order to save battery power, of course we prefer to have 1-2msec reception time.

Is ther anyway to get shorter Beacon recpton time.

We are quite uergenty clarify this issue , your quick advise.comment will be very apreciated.

BRDs.,

Keith

ps3.jpg

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1 Solution
PriyaM_16
Moderator
Moderator

Hello,

The RX window will widen if we miss a beacon. Potential reasons for beacon loss are:

1. Interference

2. Range

3. AP clock is drifting and so the board is out of sync.

10ms is the default value set in firmware for which the device keeps on listening for beacon. 

View solution in original post

8 Replies
PriyaM_16
Moderator
Moderator

Hello,

As per powersave feature, the AP is aware of the sleep time of every STA. The STA wakes up periodically as per its sleep cycle and If the AP has some data for the STA, the AP sends a beacon frame with a TIM(Traffic indication map) information element.  By examining the TIM, the station can determine if the access point has buffered traffic on its behalf. The station then receives the buffered data using PS poll frames. This could be possible reason of prolonged beacon reception time.

Anonymous
Not applicable

Dear Riya

Basically, we understand it beacon reception time might be changed
by DTIM of AP and the buffered Data to STA that you explained.

However, in our case,
-  AP DTIM is never changed
-  STA side never send any data by itself
    => STA is just waiting for the unicast packet event to itself
In this situation, why it shows such different beacon reception time?
That is our question.

BRDs,

Keith

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Anonymous
Not applicable

Woops,

Sorry   I made Typo.

  DTIM  ->   TIM

BRDs,

Keith

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PriyaM_16
Moderator
Moderator

What is the difference between the Power save modes, PS1, PS2 and PS3?

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Anonymous
Not applicable

Dear Riya

Thanks for your consideration,

PS1: WiFi = Power SaveMode , ApplicationCPU=Active mode

     in this case, Beacon Reception time is always 10msec

     This is OK.

Both PS2 & PS3 : WiFi = Power SaveMode , ApplicationCPU=Sleep mode

    PS2->  Beacon Reception time is 1msec

    PS3->  Beacon Reception time  saometime 1msec/ other time 10msec

We would like to know, why beacon reception time is changed

on WiFi =PS & ApplicationCPU =sleep mode.

10 msec Beacon Reception time will be preety much affect to the power consumption.

We would like to keep it always 1msec as much as possible.

BRDs,

K.Hirayama

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Anonymous
Not applicable

Dear Riya

Any Update on this?

BRDs,

Keith

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PriyaM_16
Moderator
Moderator

Hello,

The RX window will widen if we miss a beacon. Potential reasons for beacon loss are:

1. Interference

2. Range

3. AP clock is drifting and so the board is out of sync.

10ms is the default value set in firmware for which the device keeps on listening for beacon. 

View solution in original post

Anonymous
Not applicable

Dear Riya

Thanks for your advise.

We will discuss internally.

BRDS,

Keith

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