Relay Node Hierarchical Modulation Network Coding
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Solution Overview
Problem
Current communication systems face increased bit error rates and inefficient use of wireless resources when data transmission rates are high, particularly due to the need for additional relay stations which require extra time slots and resources.
Innovation Solution
A communication apparatus and method that employs a packet receiving unit, a packet generation unit, and a packet transmission unit to hierarchically modulate and network code packets, allowing for the generation and transmission of relay packets across multiple time slots, thereby reducing the number of required time slots and enhancing resource utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a relay station is added to solve shadow zones and reduce bit error rate, then reliability is improved, but additional wireless resources and time slots are required
Solution Approach 1:
The patent combines the relay station's transmission of source packets with its reception of destination packets into a single time slot using network coding. The relay station applies network coding to combine the source packet it needs to forward and the destination packet it needs to receive, then transmits the coded combination in one time slot, serving both functions simultaneously and eliminating the need for separate time slots.
Solution Approach 2:
The relay station continuously utilizes each time slot for dual purposes: receiving destination packets from destination nodes and transmitting coded relay packets to source nodes. This continuous dual-function operation maximizes resource utilization and eliminates idle time slots that would otherwise be required for separate transmit and receive operations.
2Area of stationary object
If a relay station is added to solve shadow zones, then coverage area is improved, but device complexity increases
Solution Approach 1:
The relay station is designed to perform multiple functions simultaneously: it acts as both a receiver for destination packets and a transmitter for source packets within the same time slot. The network coding capability enables it to process and combine packets from different directions, making it a multi-functional node that reduces overall system complexity despite extended coverage requirements.
3Productivity
If hierarchical modulation is applied to transmit packets to both relay and destination nodes, then productivity is improved, but manufacturing precision requirements increase
Solution Approach 1:
The packet transmission is segmented into different modulation layers using hierarchical modulation. The source packet is modulated with different priorities for different receivers: more robust modulation for the relay node and higher rate modulation for the destination node. This segmentation allows simultaneous transmission to both nodes with appropriate error protection levels, improving overall productivity while managing precision requirements through differentiated modulation schemes.
Data Source
AI summary
A communication system using a hierarchical modulation scheme and/or a network coding scheme is provided. A relay node included in the communication system may generate a relay packet by applying a network coding scheme to a hierarchically modulated source packet and to a destination packet received from a destination node. The relay packet is transmitted to a source node and a destination node, and the source node and the destination node may extract a desired packet from a relay packet. The communication system also may adaptively determine an optimal communication mode.