Flexible Algorithm for Arbitration of Transmit Power Between Multiple Radios

Apparatus for limiting the total transmit power of a wireless device, the apparatus comprising at least one processor, and at least one memory including computer program code, the at least one memory and the computer program code being configured to with the at least one processor, cause the apparatus at least to:

• determine the current priority of each of plural radio systems of the wireless device, each of the radio systems providing service for a different SIM of the wireless device;
• set an upper bound for the transmit power of each of the radio systems in dependence on at least the current priorities of the radio systems and a current maximum permitted transmit power of the wireless device, the upper bounds for the transmit power of each of the radio systems being variable over time and being set such that the sum of the upper bounds does not exceed the current maximum permitted transmit power of the wireless device, the transmit power of the wireless device at any time being the sum of the transmit powers of the radio systems at that time;
• and,
• for each of the radio systems, limit the transmit power of that radio system such that the respective upper bound for the transmit power for that radio system is not exceeded.

A non-transitory computer-readable storage medium comprising a set of computer-readable instructions for limiting the total transmit power of a wireless device such that when the computer program is executed on a computing device of a wireless device having a plurality of radio systems that each provide service for a different SIM of the wireless device, the computing device is arranged to:

• determine the current priority of each of the radio systems;
• set an upper bound for the transmit power of each of the radio systems in dependence on at least the current priorities of the radio systems and a current maximum permitted transmit power of the wireless device, the upper bounds for the transmit power of each of the radio systems being variable over time and being set such that the sum of the upper bounds does not exceed the current maximum permitted transmit power of the wireless device, the transmit power of the wireless device at any time being the sum of the transmit powers of the radio systems at that time;
• and,
• for each of the radio systems, limit the transmit power of that radio system such that the respective upper bound for the transmit power for that radio system is not exceeded.