Open Source Software Stack for 3G

[200207094]

For my thesis research, I am looking for a 3G protocol stack that enables users 
can call each other and make data connections. If I can, I need to establish 
7-8Mbps for downlink in lab environment. Is it even possible, I don’t know yet? 
Besides, I am sure you know if I can make a call connection between 2G and 3G 
users via Osmocom. This is my another possible research subject. Thank you very 
much in advance for your answers. Best Regards,