https://devzone.nordicsemi.com/f/nordic-q-a/60012/how-to-avoid-the-collision-in-ble-4-0-on-smartphoneI&#39;m working on a solution and facing a few difficulties. well, I have more than 100 smartphones (android and iOS) devices in closed proximity were all the devices are logging each other with say duty cycle of 1. so constant scanning is happening.I readen-USTelligent Community 13Wed, 15 Apr 2020 06:14:05 GMThttps://devzone.nordicsemi.com/thread/244584?ContentTypeID=1Wed, 15 Apr 2020 06:14:05 GMT137ad170-7792-4731-bb38-c0d22fbe4515:0938e945-ed39-4c88-b154-9e88c2427fa2bjorn-spockeli<p>Hi Kunaal,&nbsp;</p> <p>Nordic&#39;s BLE SoCs are not used in any smartphones as far as I am aware. Our SoCs are used in the peripheral devices, i.e. the devices that the smartphones connect to. Your question seems to be related to Android and iOS behavior when many(100+) BLE devices are in close proximity to each other. In general, the more devices that are advertising the more congested the three advertising channels used by BLE will&nbsp; be, so in short, the more advertising devices the higher the probability of&nbsp; packet collisions.&nbsp;There is not backoff scheme in Bluetooth Low Energy.&nbsp;</p> <p>If you are not using any Nordic SoCs then I suggest that you post this question on a Android and/or iOS developer forum.&nbsp;</p> <p>Best regards</p> <p>Bjørn</p><div style="clear:both;"></div>