Relay Station ARQ for Wireless Communication
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Solution Overview
Problem
Conventional wireless communication systems using a fixed Base Station (BS) and Mobile Station (MS) lack flexibility in adapting to changing environments, leading to inefficiencies in data communication, especially with the introduction of intelligent Relay Stations (RS) that require advanced ARQ operations beyond simple signal amplification.
Innovation Solution
The implementation of a method and apparatus for Automatic Retransmission Request (ARQ) in a wireless communication system using a relay scheme, where the Relay Station (RS) operates at both the MAC and PHY layers, enabling intelligent decision-making and resource utilization, including error detection, retransmission requests, and efficient data scheduling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If a conventional repeater is used to relay signals, then signal amplification is achieved, but intelligent decision-making and error control capabilities are lost
Solution Approach 1:
The patent introduces an intelligent relay station that acts as an intermediary between the base station and mobile station. The RS performs MAC layer ARQ operations including error detection using CRC, generating ACK/NACK signals, and managing retransmissions. This intermediary function enables intelligent decision-making while maintaining manageable device complexity through standardized protocol implementation.
Solution Approach 2:
The relay station implements self-service by autonomously performing error detection, generating acknowledgment signals, and managing retransmission requests without requiring constant base station intervention. The RS independently executes MAC ARQ protocols, making intelligent decisions about data integrity and retransmission needs based on local error checking results.
2Reliability
If ARQ operations are implemented at the relay station, then data transmission reliability is improved, but signaling overhead increases
Solution Approach 1:
The patent merges the ARQ feedback mechanism into the existing uplink data transmission channel. The mobile station sends ACK/NACK signals for relay station retransmissions using the same uplink resources already allocated for data communication. This combining of feedback signaling with data channels reduces the additional overhead that would result from separate dedicated feedback channels.
Solution Approach 2:
The uplink channel is designed to serve multiple functions: carrying both data transmission and ARQ feedback signals (ACK/NACK). This multi-functionality allows the same communication resources to handle both information transfer and reliability control, thereby reducing the total signaling overhead compared to having separate dedicated channels for each function.
3Reliability
If the relay station manages ARQ operations independently, then communication quality in poor channel conditions is improved, but system complexity increases
Solution Approach 1:
The patent segments the ARQ functionality into distinct layers: the relay station handles MAC layer ARQ operations (error detection, ACK/NACK generation, retransmission management), while the base station handles higher-layer protocols. This segmentation allows the RS to focus specifically on physical layer and MAC layer error control, improving communication quality in poor conditions without requiring the RS to implement the entire protocol stack, thus managing complexity effectively.
Data Source
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AI summary
An apparatus and method for performing Automatic Retransmission reQuest (ARQ) of a Relay Station (RS) in a wireless communication system using a relay scheme are provided. The method includes receiving data from a transmitter and transmitting the received data to one or more receivers; and receiving Acknowledgment (ACK)/Negative-Acknowledgment (NACK) information for the data received from the one or more receivers and transmitting the received ACKINACK information to a Base Station (BS).