Acknowledgement Bundling via Dynamic DAI Scheduling
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Solution Overview
Problem
Current radio communication systems face inefficiencies in acknowledgement signaling, leading to unnecessary network resource consumption, particularly in wireless data networks like 3GPP LTE, due to inefficient acknowledgement schemes.
Innovation Solution
The implementation of acknowledgement bundling through dynamic scheduling of subframes using a reused Downlink Assignment Index (DAI) field, allowing for efficient grouping of acknowledgements without increasing the field's length, thereby optimizing resource utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If acknowledgement signaling is implemented in radio communication systems, then transmission reliability is improved, but network resource consumption increases
Solution Approach 1:
The patent combines multiple acknowledgement signals into a single bundled acknowledgement signal. Multiple individual acknowledgements for different subframes are merged into one consolidated acknowledgement message, reducing the total number of signalling transmissions while maintaining reliable confirmation of data reception across multiple time slots
Solution Approach 2:
The Downlink Assignment Index field is repurposed to serve dual functions: its original function of tracking downlink assignments and a new function of indicating acknowledgement bundling status. This multi-functional use of existing signalling fields reduces overhead by eliminating the need for separate acknowledgement bundling indicators
2Loss of energy
If acknowledgement bundling is implemented, then signaling overhead is reduced, but scheduling flexibility is constrained
Solution Approach 1:
The system dynamically adjusts between bundled and non-bundled acknowledgement modes based on scheduling conditions. The network can flexibly choose whether to apply acknowledgement bundling on a per-subframe basis, allowing adaptive optimization of signalling overhead while maintaining scheduling flexibility when needed
Solution Approach 2:
The invention changes the interpretation and value range of the Downlink Assignment Index parameter to enable acknowledgement bundling. By reusing this existing parameter with modified semantics, the system achieves acknowledgement bundling functionality without adding new signalling elements that would reduce flexibility
3Reliability
If new acknowledgement schemes are developed, then network performance is improved, but compatibility with existing standards is reduced
Solution Approach 1:
The Downlink Assignment Index field performs multiple functions: it continues to indicate downlink assignment information while simultaneously encoding acknowledgement bundling status. This multi-functional approach allows new acknowledgement capabilities to be introduced without requiring new signalling fields, ensuring backward compatibility with existing LTE standards
Solution Approach 2:
The invention reuses the existing Downlink Assignment Index field structure and format rather than creating a new acknowledgement signalling mechanism. By copying and repurposing an existing field, the system introduces improved acknowledgement functionality while maintaining compatibility with current standard implementations
Data Source
AI summary
An approach is provided for acknowledgement bundling. Dynamically scheduling of one or more of subframes per bundling window is performed by reusing an assignment index field (e.g., downlink assignment index (DAI) field). The assignment index field has a value greater than or equal to number of previously assigned subframes within the bundling window. The bundling window defines a group of subframes for common acknowledgement.