Cellular dual connectivity setup

A method performed by a telecommunication device, comprising:

• establishing a primary radio transmission uplink in a first radio frequency band;
• receiving a request for a secondary radio transmission uplink in a second radio frequency band;
• determining that the telecommunication device does not support concurrent radio transmissions in the first and second radio frequency bands;
• determining an amount by which concurrently transmitting in the first and second radio frequency bands would cause a radio parameter to be outside of an allowable limit;
• and
• in response to determining that the telecommunication device does not support concurrent radio transmissions in the first and second radio frequency bands, (a) sending a refusal of the request and (b) sending data indicating the amount.

A telecommunication device, comprising:

• one or more processors;
• one or more non-transitory computer-readable media storing computer-executable instructions that, when executed by the one or more processors, cause the one or more processors to perform actions comprising:
• establishing a primary radio transmission uplink in a first radio frequency band;
• receiving, from a base station, a request for a secondary radio transmission uplink in a second radio frequency band;
• and
• specifying, to the base station, a power management technique to be used in conjunction with the primary radio transmission uplink and the secondary radio transmission uplink.