Methods and systems to perform collision detection in a communication network. The surface of the kth signal recording layer of the kth signal substrate is shaped parallel to the surface with the guide grooves and pits of the th signal recording layer on the th stamper, a th separation layer is formed between the two and then the th stamper is peeled off. The transistor comprises a first conducting gate stacked on the surface of a dielectric with doped regions formed at two sides thereof as a source and a drain. In various aspects, the well intervention apparatus comprises at least one of a hydraulic workover device, a hydraulic jacking system, a coiled tubing apparatus, a wireline device, a slickline device, and an electric line. The Au wire is prevented from coming in contact with portions around the ball bond portion other than the ball bond portion by presetting a descent position of the bonding capillary to a position higher than a position in which the ball bond is formed. When a user node departs from the distribution network, a propagation signal is transmitted to the nodes below it in the network, causing them to move up in the network in a predetermined order.