Abstract: To alleviate queue lengths at bottom nodes in two-layer networks, reduce data packet travel time, and improve overall network traffic efficiency, this paper examines information packet transfer mechanisms between network layers. The study investigates how layer judgment frequency and network coupling strength influence transmission capability and stability in dynamic and static coupled networks with limited cache capacity. We compare the operational efficiency of two layer-switching approaches by analyzing packet loss rates, traffic density, and average travel times. Network stability and reliability are measured using loss threshold values. Results indicate that in two-layer dynamic networks with limited buffer space, both the layer-switching methodology and switching probability significantly affect transmission efficiency. By jointly optimizing the layer-switching approach and inter-layer edge distribution, the network’s loss threshold can be increased, enhancing stable information transmission capacity and alleviating network congestion.

Key words: Two-layer network, dynamic network, layer-switching probability, loss threshold, packet generation rate, buffer