hardware - Does receiving of sms affects the traffic bandwidth of gsm modem -

There is a hardware system that uses GSM shield to access the Internet. The system should be reliable and all DDO attack vectors are kept in mind.

We are afraid of SMS DDO attacks, which can be felt through sending a lot of SMS messages (or especially distorted SMS / invisible SMS / Binary SMS). The question is whether sending GSM shield / modem traffic for receiving SMS? What happens when sending traffic at the time of receiving SMS? How often shield / modem is out of every SMS sending traffic service?

SMSs are typically transmitted to a control channel, such as SDCCH (stand-alone dedicated control channel) Or FAACH (Fast Associated Control Channel). These are the same channels which are used to start and capture calls. It is possible to receive a portion of the data channel to temporarily receive a control channel (eg SDCH) and receive a band to use this bandwidth to receive the SMS during the call time. If DDOS is possible, then I think the bandwidth of the mobile network operator depends more on the allocation policy.
Of course, because the free air cell used for signal transmission is a shared medium for everyone, it is always possible to collect a group of such people and generate heavy loads, which send all the SMS And at the same time as you phone calls in proximity, your GSM shield, if the purpose of DDOS attack is, then it is effectively prepared.