Hop Rate in Page Scan State

Original Post: Page scan (SIG Forum) Date: 2000-03-29

In the Baseband specs, the hop rate of a page scanning device (a device in the Page Scan Substate), is not made immediately clear. One common assumption is that a device in page scan will have a hop rate equal to that of the calling (paging) device, i. e. 3200 hop/s.

However , it is only the paging device which hops at 3200 hops per second. If you look in 10.6.2 of the baseband specification you will see "During the scan window, the unit listens at a single frequency" In successive scan windows the page scanning device will listen at different frequencies. So a page scanning device hops onto a frequency at the beginning of the scan window and stays there until the end.

Also the specs state that the scan window for the scanning device should be longer than the time for the paging device to page on 16 hop frequencies of a page hop sequence. Thus, the scan window must last at least 16 time slots or 10ms (if no SCO link presents). Note: This does not mean that in successive scan windows the page scanning device will listen at different frequencies .The hop rate of a device in page scan is once every 1.28s