A pipeline-based circuit with a postponed clock-gating mechanism and related driving method are disclosed for reducing power consumption, and the driving method does not deteriorate processing performance of the pipeline-based circuit. The anticipation time is continuously controlled with a closed-loop technique by comparing it with the duration of a reference pulse. The cranial plugs can be used to reattach the skull flap or they can be installed after the skull flap is reattached using the strip fasteners. The wireless device transmits the first packet in parallel with the random access preamble if the random access preamble and the first packet are scheduled for transmission in different cell groups and the wireless device has sufficient power to transmit the first packet in parallel with the preamble.