HARQ-ACK Feedback Multi-cell DCI Resource Allocation
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Solution Overview
Problem
Current wireless communication networks face challenges in efficiently managing bandwidth and resource allocation across multiple technologies and releases, particularly in 5G networks, leading to suboptimal performance and increased complexity in supporting diverse wireless devices and base stations.
Innovation Solution
The implementation of advanced protocol stacks and configuration mechanisms, such as bandwidth parts (BWPs) and carrier aggregation, allows for flexible and adaptive resource management, enabling efficient bandwidth adaptation and optimized communication protocols across various wireless devices and base stations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If carrier aggregation and bandwidth parts are implemented for flexible resource management, then adaptability and resource allocation efficiency are improved, but device complexity and protocol stack complexity increase
Solution Approach 1:
The patent segments the HARQ-ACK feedback mechanism into multiple independent codebooks (first HARQ-ACK codebook and second HARQ-ACK codebook), each handling different types of downlink assignments. This segmentation allows the system to manage complex multi-cell scheduling scenarios by dividing the feedback management into separate, independently controllable units, thereby improving resource allocation flexibility while keeping each codebook's complexity manageable.
Solution Approach 2:
The patent implements dynamic HARQ-ACK codebook determination where the UE can dynamically select between different codebook types (semi-static Type-1 and dynamic Type-2) based on scheduling conditions. The network can also dynamically configure which DCI formats trigger which codebook type, allowing the system to adapt to varying traffic patterns and channel conditions, thus improving resource allocation efficiency while maintaining manageable complexity through conditional logic rather than permanent structural complexity.
2Reliability
If multiple HARQ-ACK codebooks are used for different DCI formats, then HARQ-ACK feedback accuracy and reliability are improved, but signaling overhead and processing complexity increase
Solution Approach 1:
The patent creates a universal HARQ-ACK feedback framework where multiple codebooks (first and second) can handle different DCI formats (single-cell and multi-cell scheduling) within a unified PUCCH transmission structure. Both codebooks can be transmitted simultaneously or selectively based on scheduling conditions, allowing the system to maintain high reliability for diverse scheduling scenarios while avoiding redundant signaling by using a common transmission mechanism for both codebooks.
Solution Approach 2:
The patent implements a feedback mechanism where the network configures the UE with multiple HARQ-ACK codebook types, and the UE provides feedback based on received DCI formats. The network can adjust the configuration based on observed feedback patterns and channel conditions, optimizing the balance between reliability and overhead. The UE only generates and transmits specific codebooks when corresponding DCI formats are received, avoiding unnecessary feedback signaling.
3Adaptability or versatility
If semi-static and dynamic HARQ-ACK codebook types are supported, then compatibility across different wireless releases and devices is improved, but system complexity and configuration management difficulty increase
Solution Approach 1:
The patent implements semi-static Type-1 HARQ-ACK codebooks that are pre-configured through RRC signaling, allowing UEs to prepare feedback structures in advance based on configured downlink assignments. This preliminary configuration reduces runtime processing complexity and ensures compatibility across different releases, as the basic codebook structure is established beforehand. Dynamic Type-2 codebooks complement this by providing flexibility when scheduling conditions change, and the network can selectively activate appropriate codebook types.
Solution Approach 2:
The patent allows dynamic switching between Type-1 and Type-2 HARQ-ACK codebooks based on scheduling conditions and network configuration. The network can configure the UE to use different codebook types for different DCI formats or under different scheduling scenarios, enabling the system to adapt to varying complexity requirements without permanently increasing device complexity. The UE only processes and transmits the codebook type that is currently configured and applicable, maintaining manageable complexity through conditional execution.
Data Source
AI summary
A base station transmits, to a wireless device, a first downlink control information (DCI) indicating resources of a plurality of cells and a first downlink assignment index (DAI) that is associated with a first cell having a smallest cell index from the plurality of cells. The base station may also receive, from the wireless device, uplink signal comprising feedback bits corresponding to the first DCI.