URLLC UCI Transmission Reliability via PUCCH Repetition
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Solution Overview
Problem
In the 5G NR Release 16, ensuring higher reliability of Uplink Control Information (UCI) transmission, particularly for Ultra Reliable and Low Latency Communication (URLLC) business, is challenging due to the need to transmit UCI on Physical Uplink Control Channels (PUCCH) alongside Enhanced Mobile Broadband (eMBB) UCI, requiring enhanced methods to maintain reliability and efficiency.
Innovation Solution
The method involves transmitting URLLC UCI and eMBB UCI in multiple PUCCH resources, with URLLC UCI being repeated across these resources to ensure higher reliability, and using scrambling sequences to generate bit sequences for transmission, thereby reducing the code rate and improving resource utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If URLLC UCI is transmitted repeatedly on multiple PUCCHs, then transmission reliability is improved, but resource consumption increases
Solution Approach 1:
The patent segments UCI transmission by dividing it into different types (URLLC UCI and eMBB UCI) and transmitting them on different PUCCH resources. This segmentation allows selective repetition of only URLLC UCI on multiple PUCCHs while eMBB UCI is transmitted once, thereby improving reliability for critical URLLC traffic without proportionally increasing overall resource consumption.
Solution Approach 2:
The patent applies different transmission strategies to different UCI types based on their quality requirements. URLLC UCI, which requires high reliability, is transmitted repeatedly on multiple PUCCHs with lower code rates, while eMBB UCI uses standard transmission. This local quality differentiation ensures high reliability where needed without wasting resources on non-critical traffic.
2Reliability
If code rate is reduced for URLLC UCI, then transmission reliability is improved, but resource utilization efficiency deteriorates
Solution Approach 1:
The patent applies different code rates to different UCI types: lower code rates are used specifically for URLLC UCI to ensure high reliability, while eMBB UCI uses higher code rates for efficient resource utilization. This local quality approach ensures that resource efficiency is maintained for non-critical traffic while providing enhanced reliability for critical URLLC traffic.
Solution Approach 2:
The patent segments the UCI transmission into distinct resources where URLLC UCI is allocated separate PUCCH resources with lower code rates, while eMBB UCI uses other resources with higher code rates. This segmentation allows the system to optimize reliability for URLLC without unnecessarily reducing code rates for all UCI transmissions, thereby maintaining overall resource utilization efficiency.
Data Source
AI summary
The present disclosure discloses a method and a device used for wireless communication in a User Equipment (UE) and a base station. The UE receives a first radio signal and a second radio signal, and then transmits K first-type bit sequence(s) respectively in K time-frequency resource(s). A first bit block is used for indicating whether the first radio signal is correctly received, the first bit block comprises a positive integer number of bit(s); a second bit block comprises feedback to the second radio signal, the second bit block comprises a positive integer number of bit(s); each first-type bit sequence of the K first-type bit sequences comprises a positive integer number of bit(s); the first bit block and the second bit block are used for generating each first-type bit sequence of the K first-type bit sequence(s); the K is a positive integer. The above method improves transmission reliability of control information.