Communication Device Signal Detection Order Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In communication systems using automatic repeat request (ARQ) control, repeated retransmissions occur due to insufficient interference cancellation, leading to increased delay.
Innovation Solution
A communication device and method that decides the detection order of initial and retransmission signals based on the number of retransmissions, prioritizing detection of initial signals to effectively remove interference components, thereby improving signal detection accuracy and reducing delay.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If successive interference cancellation is performed without prioritizing detection order, then interference cancellation is attempted, but retransmission is repeated and delay increases
Solution Approach 1:
The patent applies preliminary action by determining the detection order of signals before actual signal processing. The detection order decision unit decides which signal to detect first based on the number of retransmissions, ensuring that signals with fewer retransmissions (initial transmission signals) are detected first. This pre-planned detection sequence prevents repeated retransmissions by establishing the correct processing order in advance, thereby reducing delay while maintaining error correction reliability.
2Productivity
If retransmission signals are detected without removing interference components first, then detection is performed, but detection accuracy decreases leading to more retransmissions
Solution Approach 1:
The patent applies preliminary action by pre-determining the detection order before signal processing begins. The detection order decision unit analyzes the number of retransmissions for each signal and establishes a detection sequence where signals with fewer retransmissions are processed first. This ensures that interference components are removed from earlier signals before later signals are detected, improving detection accuracy without requiring additional processing steps during the actual detection phase.
Solution Approach 2:
The patent applies segmentation by dividing the signal detection process into distinct stages based on the number of retransmissions. The detection order decision unit segments the signals into different groups according to their retransmission count, and the signal detection unit processes these segments in a predetermined sequence. This segmentation allows systematic removal of interference components from earlier segments before processing later segments, improving overall detection accuracy.
3Device complexity
If detection order is not decided based on retransmission number, then processing is simplified, but interference cancellation becomes insufficient causing repeated retransmissions
Solution Approach 1:
The patent applies preliminary action by having the detection order decision unit pre-calculate and establish the detection sequence based on the number of retransmissions before actual signal processing occurs. This pre-determined order ensures that signals with fewer retransmissions are always processed first, creating an efficient detection sequence that minimizes total retransmission time without adding complex real-time decision logic during the signal processing phase.
Data Source
AI summary
Provided is a communication device which performs a hybrid automatic repeat request process of requesting a transmission source to perform retransmission when an error is detected from a received signal. The communication device includes: a reception unit that receives a signal into which an initial transmission signal and a retransmission signal are multiplexed among signals including the initial transmission signal and the retransmission signal for any one signal; a detection order decision unit that decides an order of detection of the initial transmission signal and the retransmission signal from the signal received by the reception unit in response to the number of retransmissions of the initial transmission signal and the retransmission signal which are included in the signal received by the reception unit; and a signal detection unit that removes an interference component from the signal received by the reception unit by using a signal detected by the communication device according to the order decided by the detection order decision unit, and that detects the initial transmission signal and the retransmission signal. An increase of delay can be prevented when retransmission is repeated.