PUCCH Scrambling with Placeholder Bits for Priority Collision
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Solution Overview
Problem
In wireless communication systems, particularly in URLLC scenarios, there is a challenge in multiplexing UCI bits with different priorities, leading to potential dropping of low-priority UCIs when collisions occur, which affects transmission performance.
Innovation Solution
The introduction of placeholder bits into the scrambling process of PUCCH to ensure robust transmission of both high-priority and low-priority UCIs, using a modulation scheme with a modulation order greater than the number of information bits to maximize Euclidean distance and improve transmission robustness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If UCIs with different priorities are multiplexed onto the same PUCCH or PUSCH, then transmission efficiency is improved, but transmission reliability deteriorates due to potential collisions and dropping of low-priority UCIs
Solution Approach 1:
The patent segments the bit sequence into multiple parts, inserting placeholder bits at specific positions to divide the transmission into high-priority and low-priority sections. This segmentation allows the system to maintain both priority levels simultaneously without mutual interference, resolving the contradiction between multiplexing efficiency and transmission reliability.
Solution Approach 2:
The patent performs preliminary actions by inserting placeholder bits before the actual transmission occurs. These placeholder bits are placed in advance at positions where low-priority UCIs might be located, ensuring that high-priority UCIs are protected from collision before the transmission takes place, thus maintaining both efficiency and reliability.
2Reliability
If placeholder bits are inserted into the bit sequence, then transmission robustness is improved, but device complexity increases
Solution Approach 1:
The patent changes the parameter of the bit sequence by inserting placeholder bits at calculated positions based on the number of information bits and modulation order. This parameter change enhances transmission robustness while maintaining a systematic approach that doesn't significantly increase device complexity, as the insertion positions can be determined through straightforward calculations.
3Reliability
If a modulation scheme with order greater than the number of information bits is used, then Euclidean distance is maximized and transmission robustness is improved, but resource utilization efficiency decreases
Solution Approach 1:
The patent applies local quality by using a modulation scheme with order greater than the number of information bits specifically for the high-priority UCI portion, while the low-priority UCI uses the remaining modulation capacity. This localized application of higher-order modulation maximizes Euclidean distance and transmission robustness where needed, while maintaining reasonable resource utilization overall.
Data Source
AI summary
Method and device for wireless communications. A node receives a first information block; the node transmits a first PUCCH; the first information block determines a first scrambling sequence; the first PUCCH carries a first bit block and a second bit block; a number of bit(s) comprised in the first bit block is not greater than 2; a sum of a number of bit(s) comprised in the first bit block and the second bit block is greater than 2; a priority index of the first bit block is equal to a first priority index, a priority index of the second bit block is equal to a second priority index, and the first priority index and the second priority index are not equal; the first bit block and the second bit block are used together to generate a first bit sequence. Present application improves the link performance of the PUCCH.