Coordinator Link Adaptation for Multi-Rate Transmission
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Solution Overview
Problem
IEEE 802.15.4 technology is not optimized for high data rate communication and lacks multi-rate capability, making it inadequate for supporting various data transmission requirements from sensor devices that transmit both small and large amounts of data intermittently.
Innovation Solution
A system and method for a coordinator and node that involve configuring bitmap information to indicate data packet reception, broadcasting beacon packets with this information, determining data modulation based on channel state, and adjusting Guaranteed Time Slots (GTS) to optimize link adaptation and data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If IEEE 802.15.4 technology is used for wireless communication between sensor nodes, then low power consumption and simple protocol are achieved, but high data rate transmission capability and multi-rate support are lost
Solution Approach 1:
The patent implements dynamic link adaptation by allowing the coordinator and nodes to adjust modulation schemes (BPSK, QPSK, 16-QAM, 64-QAM) and data rates based on real-time channel conditions. The system dynamically switches between different transmission rates (2 Mbps, 4 Mbps, 8 Mbps, 16 Mbps) to optimize performance, making the previously static 802.15.4 protocol adaptable to varying data rate requirements.
Solution Approach 2:
The patent changes key transmission parameters including modulation order, coding rate, and data rate dynamically based on channel quality indicators such as signal-to-noise ratio and packet error rate. This allows the system to transition from fixed-rate 802.15.4 operation to multi-rate transmission with rates ranging from 2 Mbps to 16 Mbps, directly addressing the versatility deficiency.
2Productivity
If data transmission rate is increased to support large amount of data, then productivity is improved, but transmission reliability deteriorates due to channel errors
Solution Approach 1:
The patent implements a feedback mechanism where the coordinator sends block acknowledgments to nodes indicating successful or failed packet receptions. Based on this feedback and channel quality measurements, the system adjusts modulation schemes and data rates for subsequent transmissions. This closed-loop control ensures that high data rates are maintained only when channel conditions support them, preserving reliability.
Solution Approach 2:
The patent employs forward error correction coding and retransmission mechanisms to cushion against potential transmission errors before they affect reliability. By preparing error correction codes and having retransmission ready based on predicted channel conditions, the system can transmit at higher rates while maintaining reliability through pre-planned error protection.
3Productivity
If link adaptation is implemented to support multi-rate transmission, then data transmission efficiency is improved, but system complexity increases
Solution Approach 1:
The patent segments the link adaptation functionality into distinct modules: channel quality measurement, modulation selection, rate selection, and acknowledgment processing. By dividing the complex link adaptation task into manageable segments handled by separate functional blocks in both coordinator and nodes, the implementation complexity is reduced while maintaining the benefits of multi-rate transmission.
Solution Approach 2:
The patent creates a universal link adaptation framework that can operate with different modulation schemes and data rates using the same basic protocol structure. The block acknowledgment mechanism and channel quality measurement procedures remain universal across all rate modes, reducing the need for separate protocol implementations for each rate and thereby limiting complexity growth.
Data Source
AI summary
Provided is an operation method of a coordinator, the method including receiving a data packet from a node, configuring bitmap information indicating whether the data packet is received, and broadcasting a beacon packet including the bitmap information indicating whether the data packet is received.