We also did another radio environment, if you want to roam without any boundary. Suppose that there is a user who is in Europe. He uses GSM-technology for communication purposes, but, when he learns up in the United States of America, he finds that his system cannot operate in large parts of the United States of America because they work on a different standard.
So, either he is to rent equipment based on American standard or he has to go without having a set-up for mobile communication.
A possible solution to these problems could be reconfigurability of the system and when we talk of reconfigurability you can also reconfigure hardware, because hardware has got to be changed physically, but, if you think of reconfigurability, then it is possible on little software and therefore the name is software radio.