PUCCH Format Selection for HARQ-ACK Bit Capacity in Carrier Aggregation
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Solution Overview
Problem
In enhanced carrier aggregation systems, existing PUCCH formats struggle to efficiently transmit HARQ-ACK feedback information and CSI bits across multiple serving cells, leading to channel allocation and multiplexing challenges due to limited bit capacity.
Innovation Solution
A method and apparatus that dynamically determine the number of HARQ-ACK feedback information bits and UCI bits to be transmitted in an uplink subframe, selecting appropriate PUCCH formats and resources based on the number of bits, allowing for different PUCCH formats to be used in different subframes to optimize bit transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If existing PUCCH formats are used to transmit HARQ-ACK feedback information and CSI bits across multiple serving cells, then the system maintains compatibility with legacy configurations, but the bit capacity is limited and channel allocation becomes inefficient
Solution Approach 1:
The patent segments the uplink subframes into different types (first type and second type) based on the PUCCH format configuration. This segmentation allows different PUCCH formats to be used in different subframes, enabling efficient transmission of varying numbers of bits without requiring a single complex allocation scheme for all subframes.
Solution Approach 2:
The patent introduces dynamic selection of PUCCH formats (format 1a, 1b, 2, 2a, 2b, or 3) based on the number of bits to be transmitted and the subframe type. This dynamic approach allows the system to adapt the channel allocation to the actual transmission needs, improving bit capacity utilization while maintaining manageable complexity through standardized format options.
2Productivity
If a single PUCCH format is used for all uplink subframes, then the system configuration is simplified, but the bit transmission efficiency varies across different subframes
Solution Approach 1:
The patent applies local quality by assigning different PUCCH format characteristics to different subframe types. First type uplink subframes use one set of PUCCH format rules while second type uplink subframes use another set, allowing each subframe type to be optimized for its specific transmission requirements rather than using a uniform approach across all subframes.
Solution Approach 2:
The patent maintains universality by using a standardized set of PUCCH formats (1a, 1b, 2, 2a, 2b, 3) that can handle various bit capacities. These multi-functional formats can be selected based on the transmission needs, providing a universal solution that works across different subframe types and bit requirements without requiring entirely separate channel structures.
3Quantity of substance
If PUCCH format 3 is used to transmit HARQ-ACK feedback information, then up to 22 bits of information can be transmitted, but this format cannot handle larger numbers of bits required for enhanced carrier aggregation with more than 5 cells
Solution Approach 1:
The patent introduces dynamic adaptability by allowing the system to select from multiple PUCCH formats based on the actual number of bits to be transmitted. When enhanced carrier aggregation requires more than 22 bits, the system can dynamically choose formats that support larger capacities, enabling scalability beyond the limitations of PUCCH format 3 while maintaining backward compatibility for scenarios with 5 or fewer cells.
Data Source
AI summary
The present disclosure provides a method for transmitting hybrid automatic repeat-request acknowledgement (HARQ-ACK) feedback information in an enhanced carrier aggregation system. A user equipment (UE) determines the number of HARQ-ACK feedback information bits that the UE needs to transmit in an uplink subframe, and determines the number of uplink control information (UCI) bits to be transmitted in the uplink subframe based on the number of the HARQ-ACK feedback information bits, the number of channel state information (CSI) bits, and the number of scheduling request (SR) bits that need to be transmitted in the uplink subframe, and transmitting the UCI according to the PUCCH format and the resource for transmission of PUCCH determined. With the present disclosure, UCI information may be transmitted using different formats in different PUCCH formats.