Re: PS Behaviour

From: Jouni Malinen (
Date: 2002-07-26 10:39:27 UTC

On Tue, Jul 09, 2002 at 11:30:29PM -0700, R Selvaraj wrote:

> Could any of u clarify me what is the meaning for "Listen Intervel" in the 802.11b header. The std mentions that it can be used for PS ageing functionality. But, I'm not very clear about that.

There is no listen interval field in the IEEE 802.11 header, but I'm assuming you mean the Listen Interval field of association request payload. It is used to inform the AP about how often the STA wakes to listen to beacon frames. AP could then expire buffered frames if the station has not polled for then during a time interval longer than the listen interval.

> Secondly, shall an Host AP continuously transmit the buffered Bcast/Mcast frame or it should transmit one frame per DTIM. what actually it depends on ?

I haven't checked what the firmware does (this is fully controlled by the secondary firmware). I have understood IEEE 802.11 standard so that the AP can send all buffered broad/multicast frames after beacon with DTIM.

Jouni Malinen                                            PGP id EFC895FA

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