Heterogeneous WSN Bridging Device Flow Balancing
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Solution Overview
Problem
Heterogeneous wireless networks face interference issues and bottlenecks in data transmission due to shared frequency bands, particularly between ZigBee and WLAN networks, leading to deteriorated communication quality and inefficient data flow.
Innovation Solution
A heterogeneous WSN bridging device with a Zigbee transceiver module, wireless network transceiver module, processor, and transmission interfaces that switches between active and sleep modes to manage frequency bands and balance transmission flows, preventing interference and optimizing data transmission by adjusting frequency bands of Zigbee sensor nodes connected to routers with varying transmission loads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If ZigBee and WLAN operate simultaneously in the 2.4 GHz frequency band, then both networks can function, but signal interference occurs and communication quality deteriorates
Solution Approach 1:
The patent implements periodic time-division multiplexing where the ZigBee and WLAN transceivers alternately activate in time slots. The ZigBee transceiver operates during first time slots while the WLAN transceiver operates during second time slots, preventing simultaneous transmission and eliminating mutual interference in the shared 2.4 GHz band.
Solution Approach 2:
The system dynamically switches between ZigBee and WLAN operating modes based on real-time requirements. The processor controls the transceivers to transition between active and sleep states, adjusting the operational frequency band dynamically to balance network connectivity needs against interference prevention.
2Adaptability or versatility
If a ZigBee bridging device connects heterogeneous networks with different data transmission bandwidths, then network bridging is achieved, but a bottleneck occurs in data transmission
Solution Approach 1:
The patent implements dynamic flow control mechanisms where the processor monitors data transmission rates between ZigBee sensor nodes and the WLAN network. When bottleneck conditions are detected, the system adjusts transmission parameters, buffers data appropriately, and regulates the data flow to optimize throughput across the heterogeneous network interface.
Solution Approach 2:
The system changes operational parameters including transmission power levels, data packet sizes, and buffering strategies to adapt to the bandwidth differences between ZigBee and WLAN networks. These parameter adjustments enable efficient data transmission across the bridged heterogeneous networks despite their different capabilities.
Data Source
AI summary
A control method for a heterogeneous wireless sensor network (WSN) bridging device includes initializing Zigbee sensor nodes, switching a Zigbee transceiver module to a sleep mode, switching a wireless network transceiver module to an active mode, receiving an task list from a remote main control device, switching the wireless network transceiver module to the sleep mode, switching the Zigbee transceiver module to the active mode, transmitting an operating instruction to the Zigbee sensor nodes, receiving at least one sensing signal from the Zigbee sensor nodes, and determining whether the sensing signals have been received. If yes, a back transmission procedure is executed. The control method solves an interference problem among heterogeneous wireless networks and overcomes a bottleneck in data transmission.