PUCCH Format Selection for Uplink Control Information Efficiency
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Solution Overview
Problem
In LTE-A systems, there is a lack of solutions for efficiently transmitting uplink control information (UCI) with multiple aggregated carriers, particularly for ACK/NACK feedback, due to inadequate PUCCH transmission structures, leading to redundant code rates and decreased transmission efficiency.
Innovation Solution
The method involves determining a PUCCH transmission structure, including format and orthogonal sequence length, based on downlink control information (DCI) to dynamically select an appropriate transmission scheme for UCI, optimizing the use of resources and improving efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a fixed PUCCH transmission structure is used, then the system is simple to implement, but it cannot adapt to varying UCI bit quantities leading to redundant code rates and decreased transmission efficiency
Solution Approach 1:
The patent implements dynamic PUCCH transmission structure selection by introducing multiple PUCCH formats (Format 2, Format 3, Format 4) that can be adaptively chosen based on the quantity of UCI bits to be transmitted. The base station dynamically indicates the appropriate format through DCI, allowing the system to transition from a static to a dynamic transmission structure that optimizes code rate and transmission efficiency for different UCI sizes
Solution Approach 2:
The patent changes key transmission parameters including PUCCH format type, orthogonal sequence length, and resource block allocation based on the UCI bit quantity. By varying these parameters dynamically, the system achieves optimal transmission efficiency for different payload sizes while maintaining implementation feasibility through standardized format definitions
2Quantity of substance
If multiple PUCCH formats are introduced to support more carriers, then the capacity to carry UCI is increased, but the complexity of selecting the proper transmission structure increases
Solution Approach 1:
The patent creates a universal PUCCH transmission framework where multiple formats (2, 3, 4) serve different UCI capacity requirements within a single standardized structure. Each format is designed to handle specific ranges of UCI bit quantities, providing a multi-functional solution that covers both small and large payload scenarios while maintaining ease of operation through clear format selection criteria
Solution Approach 2:
The patent segments the PUCCH transmission capability into distinct formats based on UCI bit quantity thresholds. Format 2 handles smaller payloads, while Format 3 and Format 4 handle larger payloads for multi-carrier scenarios. This segmentation allows the system to provide appropriate transmission capacity for different aggregation scenarios without requiring complex real-time analysis
3Adaptability or versatility
If orthogonal sequences of different lengths are used, then the adaptability to different UCI sizes is improved, but the complexity of sequence management increases
Solution Approach 1:
The patent dynamically adjusts the orthogonal sequence length parameter based on the selected PUCCH format and UCI bit quantity. Longer orthogonal sequences are used for Format 3 and Format 4 to accommodate larger UCI payloads across multiple carriers, while shorter sequences are used for Format 2. This parameter adaptation provides versatility in handling different UCI sizes while managing sequence complexity through standardized length options
Data Source
AI summary
The present application provides a PUCCH-based uplink control information transmission method and apparatus. User equipment determines, according to downlink control information (DCI), a format of a physical uplink control channel (PUCCH) and/or information of a used orthogonal sequence; and the user equipment transmits, according to the format of the PUCCH and/or the information of the used orthogonal sequence, uplink control information borne by the PUCCH. The present application can implement selection of a transmission structure of a PUCCH to transmit uplink control information.