ARQ Feedback Message Generation in Wireless Systems
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Solution Overview
Problem
In wireless communication systems, the existing ARQ feedback mechanisms face inefficiencies when dealing with variable-length ARQ blocks, particularly in terms of resource utilization and overhead, as they require separate feedback for ARQ blocks and sub-blocks, leading to increased resource usage and complexity.
Innovation Solution
The proposed solution involves generating ARQ feedback messages using a cumulative ACK scheme and a selective ACK scheme, where additional feedback information for ARQ sub-blocks is added to the ARQ block feedback using ExT and SEM fields, allowing for efficient transmission of both block and sub-block feedback, thereby reducing overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate feedback for ARQ blocks and sub-blocks is transmitted, then complete error information is provided, but resource usage and overhead increase
Solution Approach 1:
The patent combines ARQ block feedback and ARQ sub-block feedback into a single unified feedback message. The feedback structure includes both block-level ACK/NACK information and sub-block-level selective ACK information in one transmission, eliminating the need for separate feedback messages and reducing overall resource usage while maintaining complete error information.
Solution Approach 2:
The feedback message structure is designed to serve multiple functions simultaneously: it provides cumulative ACK information for entire ARQ blocks, selective ACK information for specific sub-blocks, and hybrid feedback mechanisms. This multi-functional feedback structure reduces overhead by consolidating multiple feedback types into a single universal message format.
2Productivity
If variable-length ARQ blocks are divided into sub-blocks, then retransmission efficiency improves, but feedback complexity increases
Solution Approach 1:
The patent segments ARQ blocks into smaller sub-blocks that can be independently acknowledged and retransmitted. This segmentation allows the receiver to selectively request retransmission of only erroneous sub-blocks rather than entire blocks, improving retransmission efficiency. The feedback message includes selective ACK information for individual sub-blocks, enabling precise error handling.
Solution Approach 2:
The feedback message structure is designed to be dynamic and adaptive, adjusting its content based on the specific error conditions detected. The structure can include cumulative ACK portions, selective ACK portions, or hybrid combinations depending on which ARQ blocks and sub-blocks require retransmission, optimizing feedback complexity for each specific scenario.
3Quantity of substance
If cumulative ACK scheme is used, then feedback overhead is reduced, but selective retransmission capability is limited
Solution Approach 1:
The patent creates a universal feedback mechanism that incorporates both cumulative ACK functionality and selective ACK functionality within a single message structure. The feedback can operate in cumulative mode for blocks that are fully received, selective mode for blocks with specific erroneous sub-blocks, or hybrid mode combining both approaches, providing adaptability while maintaining reasonable overhead.
Solution Approach 2:
The feedback message structure changes its parameters (content and format) based on the specific error conditions. When entire ARQ blocks are erroneous, cumulative ACK information is provided. When only specific sub-blocks are erroneous, selective ACK information for those sub-blocks is included. This parameter adaptation allows the system to balance overhead and selectivity based on actual channel conditions.
Data Source
AI summary
An apparatus and a method for generating an Automatic Repeat reQuest (ARQ) feedback message in a wireless communication system are provided. The method includes generating first feedback information of at least one ARQ block, determining whether any ARQ blocks include at least one successfully received ARQ sub-block, when the at least one erroneous ARQ block includes at least one successfully received ARQ sub-block, adding second feedback information of the ARQ sub-blocks to the first feedback information of the ARQ blocks using a field indicating whether the second feedback information is added and a field indicating the erroneous ARQ blocks including the at least one successfully received ARQ sub-block, and sending the first feedback information with the second feedback information added, to the transmitting stage.