OMAMRC FDM Transmission with Sub-band Allocation
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Solution Overview
Problem
Existing OMAMRC transmission systems face challenges in maximizing average spectral efficiency while ensuring individual quality of service for sources, especially under conditions of slow fading and Gaussian white noise, where channel state information is not directly observable by the destination.
Innovation Solution
A method for transmitting messages in an OMAMRC system that involves simultaneous transmission of multiple sources during a time slot with allocation of sub-bands, followed by cooperative retransmissions by selected relay nodes, to maximize a quality of service metric such as spectral efficiency and reduce latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If time orthogonal multiple-access scheme is used for transmission, then multiple sources can transmit simultaneously, but transmission time and latency increase
Solution Approach 1:
The frequency band is divided into multiple orthogonal sub-bands, allowing simultaneous transmission from multiple sources without time sharing. Each source is allocated specific sub-bands, enabling parallel transmission and reducing overall transmission time while maintaining spectral efficiency.
Solution Approach 2:
The patent transitions from time-division multiplexing to frequency-division multiplexing, utilizing the frequency dimension instead of time to enable simultaneous transmissions. This dimensional change allows multiple sources to transmit concurrently on different sub-bands, reducing latency and improving productivity.
2Productivity
If rate allocation is optimized to maximize spectral efficiency, then transmission time is reduced, but individual quality of service may not be guaranteed
Solution Approach 1:
The patent implements differentiated rate allocation where each source receives a tailored transmission rate based on its channel conditions and quality of service requirements. By allocating specific sub-bands and adjusting rates locally for each source, the system maximizes overall spectral efficiency while ensuring individual QoS constraints are met through targeted resource allocation.
3Reliability
If cooperative retransmission is implemented, then transmission reliability is improved, but transmission time increases
Solution Approach 1:
The system performs preliminary rate allocation and sub-band assignment before retransmission is needed. By pre-configuring the optimal transmission parameters and having relays ready to assist, the system can execute cooperative retransmissions more efficiently, improving reliability while minimizing the time penalty associated with retransmission.
Data Source
AI summary
A message method intended for an OMAMRC telecommunication system with M sources si iε{1, . . . , M], potentially L relays (r1 . . . , rL) and a destination. The transmission is of FDM type in a band divided into B mutually orthogonal sub-bands. The method includes: a simultaneous transmission of the M sources in a time interval with allocation of at least one sub-band per source and at least one cooperative retransmission for a time interval of at least one relay node taken from among the M sources and the L relays which is selected using a selection strategy with allocation of at least one sub-band per node selected.