Acknowledgement Bundling via Dynamic Subframe Scheduling
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Solution Overview
Problem
Current acknowledgement signaling schemes in radio communication systems, such as those used in 3GPP LTE networks, are inefficient and can lead to unnecessary network resource consumption, degrading network performance.
Innovation Solution
The implementation of acknowledgement bundling through dynamic scheduling of subframes within a bundling window, utilizing the downlink assignment index field, allows for the bundling of acknowledgement information, reducing signaling overhead and enhancing network efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If traditional acknowledgement signaling schemes are used, then transmission reliability is maintained, but signaling overhead increases and network resources are consumed unnecessarily
Solution Approach 1:
The patent combines multiple acknowledgement signals (ACK/NACK) into a single bundled acknowledgement signal. Multiple downlink transmissions within a bundling window are acknowledged using one uplink signal instead of separate acknowledgements for each transmission, thereby reducing signaling overhead while maintaining reliable transmission feedback
Solution Approach 2:
The patent introduces dynamic scheduling of bundling windows and adaptive selection of acknowledgement modes. The bundling window size and configuration can be dynamically adjusted based on channel conditions and traffic patterns, allowing the system to optimize between reliability and resource efficiency in different scenarios
2Loss of energy
If acknowledgement bundling is implemented, then signaling overhead is reduced, but scheduling complexity increases
Solution Approach 1:
The patent segments the acknowledgement feedback process into distinct bundling windows with clear boundaries. Each bundling window contains a specific set of downlink transmissions that are acknowledged together, creating a structured framework that simplifies the scheduling logic despite the bundling operation
Solution Approach 2:
The patent introduces downlink assignment index (DAI) fields as intermediary signaling elements. These DAI fields provide implicit information about the bundling window contents and acknowledgement requirements, mediating between the scheduler's intentions and the user equipment's acknowledgement generation without requiring complex explicit signaling
3Adaptability or versatility
If dynamic scheduling of subframes is used, then network flexibility is improved, but protocol compatibility challenges arise
Solution Approach 1:
The patent designs the acknowledgement bundling mechanism to be universally compatible with existing 3GPP LTE standards. The same physical uplink control channel (PUCCH) resources and signalling structures are reused for both traditional and bundled acknowledgements, allowing the system to support multiple scheduling modes without requiring protocol modifications
Solution Approach 2:
The patent achieves scheduling flexibility by dynamically changing parameters such as bundling window size, subframe selection within the window, and DAI field values. These parameter changes enable adaptive scheduling while maintaining compatibility with existing protocols, as the underlying signalling structures remain unchanged
Data Source
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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.