Wireless Cooperative Reception System for Sensor Handover
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Solution Overview
Problem
In sensor systems with a large number of wireless sensors, the short-range wireless communication method used by these sensors often results in communication disruptions during handovers between relay terminals, leading to potential data interruptions, especially for high-speed sampling applications.
Innovation Solution
A wireless cooperative reception technique is implemented, where each relay terminal detects the reception strength of incoming Bluetooth packets and stores this information in a first HCI packet, which is then transmitted to a control device. The control device compares these strengths, selects the relay terminal with the highest reception strength, and sends a second HCI packet to that terminal to ensure only one response is sent back to the wireless sensor, thereby maintaining continuous data collection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If multiple relay terminals receive wireless packets from wireless sensors using short-range wireless communication, then the wireless communication range is extended and data collection coverage is improved, but communication disruptions occur during handovers between relay terminals causing data interruption
Solution Approach 1:
Multiple relay terminals are merged into a cooperative receiving system where they collectively receive wireless packets from wireless sensors. The control device coordinates among multiple relay terminals to select the appropriate relay for returning acknowledgment signals, combining their reception capabilities while maintaining communication continuity through centralized management.
Solution Approach 2:
The control device receives feedback information (first HCI packets) from multiple relay terminals about their reception status and transmits control signals (second HCI packets) back to selected relay terminals. This feedback mechanism enables the control device to manage handovers and coordinate communication among relay terminals to prevent disruption.
2Duration of action of stationary object
If short-range wireless communication method is used by wireless sensors to achieve long battery operation, then power consumption is reduced and battery life is extended, but output power is lowered resulting in limited wireless communication range
Solution Approach 1:
The patent combines multiple relay terminals with low output power into a cooperative receiving system. Each relay terminal uses low-power short-range wireless communication to receive packets from wireless sensors, and the collective system achieves extended coverage area through coordination among multiple nodes rather than requiring single-node high power.
Solution Approach 2:
Instead of increasing the communication range of a single wireless sensor through higher power output, the system transitions from a single-point transmission model to a distributed multi-point reception model. Multiple relay terminals distributed in space collectively receive packets, effectively extending the communication coverage area while maintaining low power consumption at each individual node.
3Reliability
If wireless sensors transmit packets to multiple relay terminals simultaneously, then data collection redundancy is improved and reception reliability is enhanced, but response management becomes complex and communication protocol requirements increase
Solution Approach 1:
The control device manages communication protocol complexity by implementing a centralized feedback mechanism. Relay terminals transmit their reception status information (first HCI packets) to the control device, which then sends control signals (second HCI packets) to coordinate responses. This centralized feedback management simplifies the overall protocol requirements compared to peer-to-peer coordination.
Solution Approach 2:
The control device acts as an intermediary between wireless sensors and multiple relay terminals. It receives packet information from sensors, collects feedback from relay terminals about reception status, and coordinates the acknowledgment responses. This intermediary role simplifies communication protocol requirements by centralizing the coordination function rather than requiring complex direct interactions between sensors and multiple relays.
Data Source
AI summary
Each of relay terminals transmits a wireless packet received from a wireless sensor and a reception strength of Bluetooth wireless communication to a control device using a first HCI packet, and returns a response to the wireless packet to a source wireless sensor, which is a source of the wireless packet, only when a second HCI packet is received from the control device. The control device compares the reception strengths, among the reception strengths received through the first HCI packets from the relay terminals, that pertain to the same packet transmitted from the same wireless sensor and received by the plurality of relay terminals, transmits the second HCI packet only to one target relay terminal having the highest reception strength, and relays the sensor data stored in the target relay device to a host device.