Relay Station ARQ Feedback Handling in Broadband Wireless Access
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Solution Overview
Problem
In broadband wireless access systems with relay stations, the hop-by-hop and two-link ARQ modes increase complexity by requiring the relay station to delete or amend feedback information, and the tunnel mode leads to delays due to fragmentation and packing of MAC PDUs.
Innovation Solution
The method involves generating second transmission unit data with distinct relay sequence numbers for efficient ARQ operations, allowing the relay station to transmit MS-NACK directly and reducing unnecessary delays by using the same tunnel for data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If hop-by-hop or two-link ARQ modes are used, then ARQ operation is enabled in relay station, but device complexity increases due to deletion or amendment of feedback information
Solution Approach 1:
The patent extracts the ARQ feedback information handling function from the relay station by introducing a dedicated ARQ feedback information element that carries NACK information directly from the mobile station to the base station, eliminating the need for the relay station to delete or amend feedback information while maintaining reliable ARQ operation
Solution Approach 2:
The patent introduces an intermediary ARQ feedback information element structure that mediates between the mobile station and base station, allowing direct transmission of NACK information without requiring the relay station to process or modify the feedback, thus reducing relay station complexity while preserving ARQ reliability
2Adaptability or versatility
If tunnel mode is used for data transmission, then data relay is achieved, but transmission time increases due to fragmentation and packing of MAC PDUs
Solution Approach 1:
The patent segments the data transmission process into two independent parts: the tunneling function for data relay (maintaining adaptability) and the ARQ feedback function (eliminating delay). By separating these functions and allowing direct NACK transmission, the patent achieves both data relay capability and reduced transmission time without compromising either aspect
Data Source
AI summary
The present invention relates to a broadband wireless access system including a relay station, and more particularly to an efficient procedure of Automatic Repeat Request (ARQ) operations in a relay station and an apparatus for performing the same. A method for transmitting data for at least one terminal (AMS) from a base station (ABS) to a relay station (ARS) in the broadband wireless access system according to an embodiment of the present invention comprises the steps of generating second transmission unit data using a plurality of first transmission unit data to which different relay sequence numbers are assigned; and transmitting the second transmission unit data to the relay station. The second transmission unit data can be transmitted through the same tunnel as the first transmission unit data.