PUCCH Resource Allocation for HARQ-ACK Multiplexing
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Solution Overview
Problem
In wireless communication systems, particularly in URLLC scenarios, the existing technologies face challenges in efficiently multiplexing UCI with different priority levels, leading to issues like abandonment of lower-priority UCI and suboptimal resource utilization, which affects the overall transmission performance.
Innovation Solution
A method is introduced where a target PUCCH carries bit sub-blocks with different priority levels, determining the number of bits based on a relative magnitude of RB numerical values and a factor, allowing for efficient multiplexing of high and low-priority HARQ-ACK bits, ensuring robust transmission performance by optimizing resource allocation and coding rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If lower-priority UCI is abandoned to guarantee high-priority UCI transmission, then high-priority transmission reliability is improved, but resource utilization deteriorates
Solution Approach 1:
The PUCCH transmission is segmented into multiple bit sub-blocks, where each sub-block corresponds to a specific priority level. The method divides the total bit sequence into high-priority sub-blocks and low-priority sub-blocks, allowing independent handling and transmission of each segment. This segmentation enables the system to transmit multiple priority levels simultaneously without mutual interference, resolving the contradiction between ensuring high-priority reliability and utilizing resources efficiently.
Solution Approach 2:
Different coding rates and transmission parameters are applied to different bit sub-blocks based on their priority levels. High-priority bit sub-blocks receive higher coding rates and more robust protection, while low-priority bit sub-blocks use lower coding rates. This local differentiation of transmission quality allows the system to optimize resource utilization while maintaining the required reliability for high-priority transmissions.
2Loss of energy
If multiple priority levels are multiplexed onto the same PUCCH, then resource utilization is improved, but transmission complexity increases
Solution Approach 1:
The method segments the multiplexing process by dividing the PUCCH bit sequence into distinct priority-based sub-blocks. Each sub-block is independently coded and transmitted, which simplifies the overall multiplexing complexity by breaking down the complex multi-priority problem into manageable independent segments that can be handled separately.
Solution Approach 2:
The patent applies preliminary actions by pre-determining the coding rates and transmission parameters for each priority level before actual transmission. The network configures and signals the maximum coding rates for different priority levels in advance, allowing the terminal to perform straightforward multiplexing without complex real-time decisions, thereby reducing transmission complexity while maintaining high resource utilization.
3Productivity
If maximum coding rate is applied to all UCI bits, then transmission efficiency is improved, but reliability of high-priority UCI deteriorates
Solution Approach 1:
The method applies different coding rates to different bit sub-blocks based on their priority levels. High-priority bit sub-blocks are allocated higher coding rates (lower spectral efficiency) to ensure reliable transmission, while low-priority bit sub-blocks use lower coding rates (higher spectral efficiency) to maximize resource utilization. This local differentiation resolves the contradiction between transmission efficiency and high-priority reliability.
Solution Approach 2:
The patent dynamically adjusts the coding rate parameter based on the priority level of each bit sub-block. By changing the coding rate parameter locally for different priority levels rather than applying a uniform maximum coding rate, the system achieves both high transmission efficiency for low-priority data and high reliability for critical high-priority transmissions.
Data Source
AI summary
The present application discloses a method and a device in a node for wireless communications. A node receives a first information block, the first information block being used to determine a first factor; and transmits a target PUCCH, the target PUCCH at least carrying a first bit sub-block; the target PUCCH carries a non-negative integer number of bit(s) belonging to a second bit sub-block; the number of bit(s) comprised in the first bit sub-block and the number of bit(s) associated with the second bit sub-block are used together to determine a first RB numerical value; a resource occupied by the target PUCCH belongs to a target resource, with a number of RBs comprised in the target resource in frequency domain being equal to a second RB numerical value. The present application improves the resource utilization ratio of HARQ multiplexing.