The easy answer I kind of already know, yes. I learned that the main differences between wireless unicast, multicast and broadcast lies in the encryption section. Correct me if I am wrong, but I believe this to be generally the case:
- Wireless unicast is established when your mobile device contacts your network provider and provides you and your communicating partner with a cryptographic key. This key is then used to provide a secure channel such that only you two are able to read the message (even though a wireless transmitted message is basically received by every other radio device as well)
- Wireless multicast works similarly to unicast, except for the cryptographic key being provided to a group of communicating partners, such that only their devices are able to make sense of messages transmitted wirelessly.
- Wireless broadcast does not require contact with your network provider, since you broadcast your message to everyone. Hence, a cryptographic key is not necessary. Can I therefore send a message (unencrypted) from my mobile device to everyone around me (within transmission range), and how would I do this?
I think you are referring to Cellular Broadcasting, primarily used in case of emergencies, by the cellular carrier. Not by individual cell phones.
http://cellbroadcastforum.org/whatisCB/
https://en.wikipedia.org/wiki/Cell_Broadcast
https://www.phonescoop.com/articles/article.php?a=1991
It would be extremely disruptive, if individual user phones were permitted to broadcast that way. Not saying that it should be technically impossible to implement, but there are good reasons for the cell carrier to block any such attempts.
From the transmission point of view, the mobile phone electromagnetic radiation covers an appreciable area around it and can reach any receiver exiting in this covered area. In fact the wireless communication systems have broad cast nature as their radiation covers the area around them. Only the midi um access control protocols restricts their receivers in the sense that that only the untended receiver or relievers can receive their transmitted signals. The mobile phone is working under the control of the base station in the sense that it gets its frequency, time slot or code , power level from the base station.
However , if it is wanted it could be made to work in the broadcast mode but it must possess the suitable protocols.
Best wishes
which kind of network is your intention?
Currently most of the cell phones support cellular, Wi-Fi, and Bluetooth.
You can use it for Wi-Fi broadcasting but cellular broadcasting is not applicable.
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