The radio module in the smartphone
Why do I need a radio module in the phone
The radio module in the mobile phone plays a crucial role. Its task is to receive and transmit network signals, i.e. it is thanks to him that you can make and receive calls, messages, use mobile Internet.
The radio module itself occupies a modest area on the motherboard. Interference, marriage during the installation of the module, the presence in the immediate vicinity of large metal elements impair the quality of signal transmission.
The difference between smartphones with one and two radio modules
Features of the radio module in the smartphone will be of interest to users of devices with two SIM cards. Cellular models are divided into those that support the work of two sim-cards simultaneously and alternately. So, one radio module can function with several sim cards, i.e. with different networks and different mobile phone numbers, the user can receive calls to two numbers and make outgoing calls from any number, but, when one of the SIMs is active, the other card becomes not available for receiving the network. Thus, in the activity mode, for example, a conversation, only one SIM card will work, while in the standby mode, the radio mule is ready to work with any of the cards that the first will become active. This happens because one communication channel actually works.
Some manufacturers sometimes produce smartphones with two radio modules, in which case both networks are always available, however, this technology increases the cost of production, affects the decrease in smartphone autonomy and does not apply to mass demand. A small percentage of users who need to have a parallel number operation have to choose from a very limited lineup available on the mobile market.
If you go a little deeper into the nuances, then most of the commercially available mobile devices with 2 SIM cards operate in DSDS mode. The essence of his work is alternating and it is based on the operation of one radio module. When the mobile is in standby mode, both SIM cards are connected to their network at the same time due to the compression of the transmission channel, i.e. at rest, several streams at a lower speed are transmitted through one channel. As soon as a call arrives on one of the SIM cards, the second is automatically turned off and becomes inaccessible to external calls and messages.
If we compare the operation of this mode with the work of a smartphone with one SIM card, the communication quality of such a device will be slightly lower. This is due to the fact that the radio module constantly carries a double volume load and is forced to alternately turn to one or the other base station of different mobile operators.
Probably, it was for users who did not suffer any compromises that devices with support for DSDA mode were created. Such phones are equipped with 2 radio modules that are independent of each other in their work. The advantage of this mode is the ability to receive incoming calls and messages simultaneously on both SIM cards. At the same time, DSDA-smartphones mercilessly absorb energy, as already mentioned, and are quite expensive devices.