UCI Priority Configuration for 5G NR Slot Collision Handling
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Solution Overview
Problem
Existing wireless communication systems in 5G NR face challenges in handling UCI collisions within a slot, particularly for different service types such as eMBB and URLLC, without adequate mechanisms for multiplexing, prioritization, or collision behavior.
Innovation Solution
A method for configuring the priority of UCI using a new-RNTI to identify HARQ-ACK codebooks, with specific threshold-based and MAC CE mechanisms to determine the MCS table and prioritize UCI transmissions based on service type and transmission characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple UCI messages are transmitted in the same slot for different service types, then resource utilization is improved, but collision and interference between UCI messages occurs
Solution Approach 1:
The patent segments UCI messages into different types (HARQ-ACK, CSI, SR) and further categorizes them by priority levels. Different UCI types are multiplexed on different PUCCH resources or multiplexed on PUSCH with different MCS tables, preventing collisions and ensuring reliable transmission of critical UCI messages.
Solution Approach 2:
The patent introduces a priority parameter in the RRC configuration that allows the network to indicate different priority levels for UCI messages. The UE uses this priority information to determine which UCI messages to transmit and which to drop when collisions occur, thereby maintaining reliability while maximizing resource utilization.
2Reliability
If priority-based multiplexing of UCI messages is implemented, then collision handling is improved, but system complexity increases
Solution Approach 1:
The patent performs preliminary configuration by introducing a priority parameter in the RRC configuration before actual UCI transmission occurs. The network pre-configures priority levels and corresponding PUCCH resources or MCS tables, so that during operation the UE can quickly determine the correct transmission parameters without complex real-time decision-making.
Solution Approach 2:
The patent uses the priority parameter as an intermediary mechanism that simplifies the collision handling process. Instead of requiring complex real-time arbitration logic, the pre-configured priority parameter acts as a mediator that guides the UE in selecting appropriate PUCCH resources or MCS tables, reducing the complexity of UCI message handling.
3Reliability
If different MCS tables are configured for different service types, then data transmission reliability is improved, but configuration complexity increases
Solution Approach 1:
The patent makes the RRC configuration structure universal by allowing the same configuration framework to handle multiple service types (eMBB, URLLC) and multiple UCI message types through a single priority parameter. This multi-functional approach avoids the need for separate configuration mechanisms for each service type, thereby maintaining reliability while reducing configuration complexity.
Data Source
AI summary
A base station for wireless communication is provided. The base station transmits to a user equipment (UE) a first Radio Resource Control (RRC) configuration and the second RRC configuration. The first RRC configuration is for configuring a first semi-persistent scheduling (SPS) physical downlink shared channel (PDSCH) and includes a first parameter indicating its relative priority for when the first SPS PDSCH overlaps with another SPS PDSCH in a time domain The second RRC configuration, which overlaps the first SPS PDSCH, is for configuring a second SPS PDSCH and includes a second parameter indicating its relative priority for when the second SPS PDSCH overlaps with another SPS PDSCH in the time domain.