Relay Station ACK Channel Arrangement for Wireless Data Error Control
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Solution Overview
Problem
In wireless relay communication systems, existing ARQ methods fail to efficiently manage and transmit ACK channels, particularly in scenarios involving relay stations, leading to challenges in data error control and recovery.
Innovation Solution
The method involves an apparatus and technique at a Relay Station (RS) to simultaneously transmit multiple ACK channels to an upper node, arranging them based on scheduling information provided by the upper node, distinguishing between ACK channels for scheduled and unscheduled data, and transmitting these channels efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple ACK channels are transmitted simultaneously from a relay station, then data error control and recovery efficiency is improved, but device complexity and signal management difficulty increase
Solution Approach 1:
The patent segments the uplink reception time slot into multiple distinct regions, with each region dedicated to carrying ACK information for a specific downlink transmission. This segmentation allows the relay station to simultaneously manage multiple ACK channels without confusion, as each ACK is transmitted in its designated time region, thereby improving data error control while maintaining manageable device complexity through structured organization.
2Productivity
If ACK channels are arranged according to scheduling information, then transmission efficiency and data integrity are improved, but processing complexity at the relay station increases
Solution Approach 1:
The base station performs preliminary scheduling of downlink data transmissions and provides scheduling information to the relay station in advance. This scheduling information includes the arrangement of uplink reception time slots and the correspondence between downlink data and ACK channels. By having this information prepared beforehand, the relay station can efficiently arrange and transmit multiple ACK channels without requiring complex real-time processing, thus improving transmission efficiency while keeping processing complexity manageable.
3Measurement precision
If distinguished ACK channels for scheduled and unscheduled data are transmitted, then data recovery accuracy is improved, but channel arrangement complexity increases
Solution Approach 1:
The patent applies local quality by assigning different characteristics to different ACK channels based on their purpose. Scheduled data ACK channels follow a predetermined arrangement based on scheduling information, while unscheduled data ACK channels (such as retransmission ACKs) are arranged differently, possibly in remaining time regions or with different mapping rules. This differentiation allows the system to achieve high data recovery accuracy by treating different data types appropriately, while the channel arrangement complexity is managed through clear distinction and separate handling rules.
Data Source
AI summary
An apparatus and a method for transmitting ACKnowledge (ACK) channels by a Relay Station (RS) in a wireless communication system are provided. The method includes, when receiving one or more ACK information from one or more lower nodes, checking ACK channel constitution information provided from an upper node, arranging one or more ACK channels to transmit corresponding ACK information according to the ACK channel constitution information by distinguishing ACK information of one or more data scheduled by the upper node and ACK information of one or more retransmission data not scheduled by the upper node, and transmitting the one or more ACK information to the upper node in the arranged ACK channels.