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how to page/paging

dsp999
Expert 1495 points
Other Parts Discussed in Thread: CC2541

while searching google or this forum, they always miss understand page/paging. so I ask here.

1, bluetooth connect between device and phone success.  (after paring and bonding)

2, phone goes far and connect lost

3, phone comes back and connect recover automatically.

question: what should the device do between step 2 and 3?  it should not be in broadcast.   after searching and reading some documents I believe it is in paging? or inquire?

which way is most power saving?  and what api/reference code should I use (for CC2541)? I did not find it in HCI/GAP/GATT etc.

  • 0
    TI__Guru 57865 points

    Hi,

    A Bluetooth low energy Peripheral device would be advertising so that when the phone get in range, it will be able to connect again. The advertising interval is typically low to save power but it's also important to be able to connect fast (which would require higher advertising interval). A "good" value would be between 500ms and 1500ms.

    Use SimpleBLEPeripheral or KeyfobDemo as reference as both advertises default upon disconnect.

    Best Regards

    Joakim

  • 0 in reply to J Lindh
    Expert 1495 points

    I have read about the HID device profile, like bluetooth keyboard, it should support paging precess. 

    I think paging is lower power consumption than advertising.

    does TI bluetooth stack support this feature? 

  • 0 in reply to dsp999
    TI__Guru 57865 points

    Hi, 

    I think you might mix Bluetooth Classic with Bluetooth low energy, which are very different.

    Bluetooth low energy uses HID Over GATT Profile (HOGP) which I cannot find any relating paging/inquiry information about. 

    Best Regards

    Joakim

  • 0 in reply to J Lindh
    Expert 1495 points

    yes I think so. thanks for reminder.

    HOGP profile is different. it is advertising.  

    so by saying "bluetooth low energy" it means HID device in this HOGP profile is more power saving than in traditional HID profile?

    ble advertising (in low duty-cycle) better in power saving than (traditional) paging process?

    how about connecting time?  device advertising/host scan and connect time is shorter than paging/paging scan&reconnect?

  • 0 in reply to dsp999
    TI__Guru 57865 points

    Hey,

    Bluetooth low energy (BLE) is a new sub-technology that is covered by the Core specification. You will save much more power with it because of multiple reasons. I'm not familiar with paging so I can't comment on that.

    Generally, everything in BLE is much more power optimized than Bluetooth Classic, including connections etc.

    Best Regards

    Joakim

  • 0 in reply to J Lindh
    Expert 1495 points

    Many Thanks. Understand.

    I am from Quickembed.com, we will soon make new bluetooth ble product. :)