A wireless internet card to support enhancing power efficiency. The wireless internet comprises a front end comprising shared frequency resources. The wireless internet card also comprises a first wireless block and a second wireless block. While the first wireless block is in low-power mode, the second wireless block may get access to the shared radio frequency resources without waking-up the first wireless block thus enhancing the power efficiency. The second wireless block sends a request to the first wireless block to use shared radio frequency resources. A coexistence block coupled to the second wireless block and the first wireless block may wait for a time duration to elapse after the request is received and may allow the second wireless block to use the shared radio frequency resources if the time duration is elapsed.