MIMO Transmission Antenna Selective Retransmission Control
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Solution Overview
Problem
In MIMO communication schemes, existing retransmitting methods result in increased retransmission information and redundant coding bits, leading to significant throughput decreases due to the need to retransmit data from all antennas.
Innovation Solution
A transmitting apparatus that collectively encodes and modulates data for multiple antennas, with a transmission controlling section that retransmits data from fewer antennas than the total, optimizing retransmission by selecting the best antenna based on quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If all data transmitted from all antennas is retransmitted collectively, then transmission reliability is improved, but retransmission information volume increases significantly and throughput decreases
Solution Approach 1:
The patent extracts and retransmits only the specific antenna data that requires retransmission rather than retransmitting all antenna data collectively. The transmission control section identifies which antenna's data failed to decode successfully and retransmits only that specific antenna's data, thereby reducing retransmission overhead while maintaining reliability.
Solution Approach 2:
The patent segments the retransmission process by antenna, allowing independent retransmission control for each antenna. Instead of treating all antennas as a single unit requiring collective retransmission, the system divides the retransmission task into antenna-specific segments, reducing the total retransmission data volume.
2Productivity
If encoding is performed per antenna with independent retransmission, then retransmission information volume is reduced, but redundant coding bits increase significantly and throughput decreases
Solution Approach 1:
The patent merges the encoding process across all antennas into a single collective encoding operation. The encoding section encodes data from multiple antennas together, creating a unified coded stream that reduces redundant coding bits compared to independent per-antenna encoding, while still allowing selective retransmission of individual antenna data.
3Measurement precision
If null signal is transmitted from other antennas during retransmission, then quality of retransmission information is improved, but device complexity and operation complexity increase
Solution Approach 1:
The patent applies partial action by transmitting data from only the necessary antenna during retransmission rather than controlling multiple antennas with null signals. The transmission control section activates only the antenna whose data requires retransmission, simplifying the transmission operation while maintaining signal quality.
Data Source
AI summary
There is provided a transmission device capable of preventing increase of retransmission information or encoding redundant bit and improving a throughput in a MIMO communication method. In this device, an encoding unit (130) subjects data transmitted from a first transmission antenna (110) and a second transmission antenna (120) each formed by a plurality of antennas, to encoding processing all at once. Modulation units (113, 123) modulate the data encoded by the encoding unit (130) for each of the first and the second transmission antennas (110, 120). Transmission units (115, 125) process the modulated data so that it can be transmitted from the corresponding first and the second antennas (110, 120). A transmission control unit (160) performs transmission control of the data transmitted from the respective antennas (110, 120). When retransmitting data, the transmission control unit (160) retransmits the data transmitted from a transmission antenna having a smaller number of antennas than the first and the second antennas (110, 120).