Wireless Relay Station ARQ Control for Data Reliability
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Solution Overview
Problem
Conventional wireless communication systems with repeaters are inefficient in retransmitting data due to their ability to interpret messages at both the MAC and PHY layers, leading to suboptimal signal amplification and relay processes, particularly in multihop relay environments where error correction and retransmission management are complex.
Innovation Solution
A wireless relay communication system where a relay station (RS) independently receives and transmits data, using error check codes to identify corrupted packets and request retransmissions from a base station (BS), enhancing data reliability by separating the transmission and reception processes and utilizing control messages for error correction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the relay station merely amplifies and relays signals without interpreting messages, then signal amplification efficiency is improved, but the ability to perform error correction and retransmission management deteriorates
Solution Approach 1:
The patent divides the relay station's functionality into two separate entities: a simple signal amplification/relay function and an error correction/retransmission management function. The base station retains full protocol interpretation capabilities while the relay station focuses on signal amplification, creating a segmented functional architecture that resolves the contradiction between amplification efficiency and error correction capability
Solution Approach 2:
The patent introduces a new control message mechanism that acts as an intermediary between the base station and relay station. The base station sends control messages to the relay station to indicate which packets require retransmission, enabling the relay station to perform intelligent relaying without needing full protocol interpretation capabilities, thus maintaining both amplification efficiency and error correction capability
2Reliability
If the relay station interprets messages at MAC and PHY layers, then error correction capability is improved, but device complexity increases
Solution Approach 1:
The patent extracts the complex message interpretation and error correction logic from the relay station and relocates it to the base station. The relay station only needs to amplify signals and forward control messages, significantly reducing its complexity while the base station handles all protocol interpretation and retransmission management
Solution Approach 2:
The base station performs self-service by independently managing error correction and retransmission decisions. Instead of requiring the relay station to interpret messages and make error correction decisions, the base station monitors packet reception status and directly controls retransmission operations through control messages, simplifying the overall system architecture
3Reliability
If the relay station performs full ARQ protocol processing, then data reliability is improved, but productivity decreases
Solution Approach 1:
The patent implements preliminary action by having the base station pre-determine which packets require retransmission and communicate this information to the relay station via control messages before actual retransmission occurs. This allows the relay station to prepare for efficient retransmission without needing to perform complex protocol processing in real-time, improving both reliability and productivity
Data Source
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AI summary
Apparatus and method for performing Automatic Retransmission request (ARQ) in a wireless relay communication system are provided, which include performing ARQ with the base station (BS), transmitting data successfully received from the BS to mobile station (MS), and retransmitting corresponding data to the MS when a retransmission indication message is received from the BS. Since the relay station (RS) relays only the errorless data to the receiver, the reliability of the data received at the receiver can be enhanced. The load on the RS can be reduced because the transmitter controls the ARQ.