Feedback Codebook Switching Across Slots for Reliable Uplink
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Solution Overview
Problem
Existing wireless communication systems face inefficiencies in selecting and switching between different codebook types for transmitting feedback messages, leading to potential resource wastage and reduced reliability due to varying codebook sizes and reliability characteristics.
Innovation Solution
Implementing slot-based feedback codebook type switching, where UEs and network entities can dynamically switch between different codebook types based on control signaling, size thresholds, and component carriers, enabling more efficient resource utilization and reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single codebook type is used for all feedback transmissions, then device complexity is reduced, but resource efficiency and reliability deteriorate due to inability to adapt to varying slot conditions
Solution Approach 1:
The patent implements dynamic codebook type selection where the UE can switch between different codebook types (e.g., Type 1, Type 2, Type 3) based on slot-specific conditions. The codebook type is no longer fixed but adapts dynamically according to the slot format indicator (SFI), allowing the system to optimize feedback transmission for each slot's specific characteristics while maintaining manageable complexity through predefined selection rules.
Solution Approach 2:
The patent changes the parameter of codebook type selection from a static configuration to a dynamic parameter that varies per slot. By introducing slot format indicators and establishing mapping relationships between SFI values and codebook types, the system enables parameter changes that adapt to different transmission scenarios without requiring complex real-time optimization algorithms.
2Reliability
If codebook size is increased to improve reliability, then transmission reliability improves, but resource efficiency deteriorates due to increased overhead
Solution Approach 1:
The patent applies local quality by selecting different codebook types with different sizes and reliability characteristics for different slots based on local conditions. For example, in slots with favorable channel conditions or specific traffic patterns, a smaller codebook type may be selected to reduce overhead, while in slots requiring higher reliability, a larger codebook type is chosen. This localized optimization prevents uniform use of large codebooks across all slots.
Solution Approach 2:
The patent implements partial action by selecting codebook types that provide sufficient (but not excessive) reliability for each specific slot's requirements. Rather than always using the most reliable (largest) codebook type, the system selects the appropriate level of redundancy needed for each slot's conditions, avoiding unnecessary resource consumption while maintaining adequate reliability.
3Productivity
If multiple codebook types are configured for different slots, then resource efficiency improves through optimization, but device complexity increases due to switching management
Solution Approach 1:
The patent applies preliminary action by pre-configuring multiple codebook types and establishing predefined mapping rules between slot format indicators and codebook types before actual feedback transmissions occur. The network entity and UE both prepare the codebook type selection strategy in advance through RRC signaling, so that during actual operation, the UE can quickly determine the appropriate codebook type based on the received SFI without complex real-time decision-making.
Solution Approach 2:
The patent implements feedback mechanisms where the network entity receives feedback from the UE about codebook type usage and slot conditions, allowing it to adjust and optimize the codebook type configuration. This feedback loop enables the system to learn from actual transmission outcomes and refine the mapping between SFI values and codebook types, improving productivity while keeping complexity manageable through data-driven optimization.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. A UE may receive control signaling indicating feedback codebook types that the UE is permitted to use for transmitting feedback codebook payloads in feedback time slots and indicating that switching between feedback codebook types is enabled. The UE may monitor for, and a network entity may transmit, one or more first messages within one or more first time slots and one or more second messages within one or more second time slots. The UE may transmit, in a first feedback time slot, a first feedback codebook payload in accordance with a first feedback codebook type based on the monitoring, and may transmit, in a second feedback time slot, a second feedback codebook payload in accordance with a second feedback codebook type based on the monitoring and on the control signaling indicating that switching between feedback codebook types is enabled.