Sensor Network Channel Allocation Reducing Power Consumption
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Solution Overview
Problem
In wireless sensor networks, the limited availability of guaranteed time slots (GTS) in IEEE 802.15.4 standards restricts the number of sensor nodes that can maintain fixed transmission rates, leading to unnecessary power consumption and potential transmission collisions due to continuous channel monitoring in contention access periods (CAP).
Innovation Solution
A channel allocation system and method that utilizes a PAN coordinator to generate and transmit channel allocation information and CSMA idle information, allowing nodes to determine transmission times and operate efficiently by identifying available channels in contention-free periods (CFP) and managing reception functions based on channel allocation and sharing status, thereby reducing unnecessary reception power consumption and avoiding collisions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sensor nodes continuously monitor channels in CAP to maintain fixed transmission rates, then transmission reliability is improved, but power consumption increases
Solution Approach 1:
The system performs channel allocation in advance during CFP before the CAP begins. The PAN coordinator allocates specific channels to sensor nodes based on their transmission requirements, and nodes enter sleep mode during CAP since their transmission channels are already predetermined. This preliminary allocation eliminates the need for continuous monitoring during CAP, reducing power consumption while maintaining transmission reliability.
2Quantity of substance
If the number of GTS is increased to accommodate more sensor nodes with fixed transmission rates, then the number of accommodated nodes is improved, but the system complexity increases
Solution Approach 1:
The system divides the wireless communication period into two distinct segments: CFP (Contention-Free Period) for channel allocation and CAP (Contention Access Period) for data transmission. During CFP, the PAN coordinator allocates channels to multiple sensor nodes using a structured allocation algorithm. During CAP, nodes transmit on their pre-assigned channels without monitoring. This segmentation allows multiple nodes to operate with fixed transmission rates without increasing overall system complexity, as each node follows a simple predetermined protocol.
3Adaptability or versatility
If sensor nodes operate in CAP without channel allocation, then adaptability is improved, but transmission collisions increase
Solution Approach 1:
The system performs preliminary channel allocation during CFP before CAP begins. The PAN coordinator assigns specific channels to sensor nodes based on their transmission requirements and network conditions. During CAP, nodes transmit on their pre-assigned channels without performing CSMA-CA monitoring. This preliminary action maintains adaptability because the allocation is based on node requirements while eliminating collisions by ensuring each node has a dedicated transmission channel during CAP.
Data Source
AI summary
A channel allocation system for accommodating a plurality of nodes in a sensor network includes a PAN coordinator generating channel allocation information and CSMA idle information and transmitting a beacon including the channel allocation information and the CSMA idle information; and at least one node receiving the beacon, determining whether the contention period is in idle state based on the extracted channel allocation information and the CSMA idle information, determine a transmission time, an operation state in a reception interval, how to process received data by determining whether a channel is allocated based on whether the contention period is in idle state, and operating according to the determination result.