UCI Multiplexing on PUSCH and Configured Grant Resources
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Solution Overview
Problem
The current procedures for UCI multiplexing in wireless communication networks, such as RUCIMP, are complex and inefficient, leading to issues like PUSCH transmission cancellation, insufficient UCI carrying capacity, and decoding failures, particularly in 5G networks with features like skipUplinkTxDynamic and prioritized PUSCH transmissions.
Innovation Solution
A method and system for configuring UE and radio network nodes to multiplex UCI with PUSCH or Configured Grant (CG) resources based on conditions such as priority, presence of MAC PDU, CG size, and PDCCH failure rate, to improve UCI transmission efficiency and reduce complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If current UCI multiplexing procedures (RUCIMP) are used, then UCI transmission is supported, but the procedures become complex and lead to transmission cancellations and decoding failures
Solution Approach 1:
The patent changes the parameter of multiplexing priority from dynamic determination to configured priority. The gNB configures priority values for different UCI types and channels, and the UE follows these configured priorities without complex real-time decisions, thereby reducing procedure complexity while maintaining reliable UCI transmission
Solution Approach 2:
The gNB performs preliminary configuration of multiplexing priorities before actual UCI transmission occurs. By pre-configuring priority values for different UCI types, channels, and carriers, the system eliminates the need for complex real-time priority determination, reducing both UE complexity and transmission failures
2Productivity
If PUSCH transmission is prioritized over UCI, then uplink data transmission efficiency is improved, but UCI carrying capacity becomes insufficient
Solution Approach 1:
The patent applies local quality by assigning different multiplexing priorities to different UCI types, channels, and carriers based on their specific requirements. Critical UCI (e.g., HARQ-ACK) receives higher priority locally, while less critical data can be deprioritized, ensuring sufficient UCI carrying capacity in critical areas while maintaining overall uplink efficiency
Solution Approach 2:
The patent introduces dynamic multiplexing priorities that can be adjusted through gNB configuration. The priority values are not fixed but can be dynamically changed based on network conditions and QoS requirements, allowing the system to adapt between prioritizing UCI transmission and prioritizing uplink data transmission efficiency
3Productivity
If multiple PUSCH transmissions are scheduled simultaneously, then uplink throughput is increased, but determining which PUSCH to use for UCI multiplexing becomes complex
Solution Approach 1:
The patent changes the selection criterion from complex multi-factor evaluation to simple configured priority comparison. Each PUSCH is assigned a multiplexing priority parameter by the gNB, and the UE simply selects the PUSCH with the highest priority value for UCI multiplexing, greatly reducing selection complexity while supporting multiple simultaneous PUSCH transmissions
Solution Approach 2:
The gNB performs preliminary assignment of multiplexing priorities to different PUSCH transmissions before the UE needs to make selection decisions. This pre-configuration eliminates the need for complex real-time evaluation of multiple PUSCH candidates, allowing the UE to efficiently handle multiple simultaneous PUSCH transmissions
4Adaptability or versatility
If UCI is multiplexed on dynamically scheduled PUSCH, then flexibility is improved, but reliability decreases due to potential PDCCH decoding failures
Solution Approach 1:
The patent introduces configured grant PUSCH as an intermediary resource for UCI transmission. When dynamic PUSCH scheduling fails (PDCCH decoding failure), the UE can fall back to pre-configured grant resources that do not require PDCCH decoding, thereby maintaining UCI transmission reliability while preserving flexibility through the primary dynamic scheduling path
Solution Approach 2:
The system prepares backup UCI transmission resources (configured grant PUSCH) in advance. When dynamic scheduling fails, these pre-prepared resources provide immediate cushioning, ensuring UCI transmission reliability without requiring complex re-scheduling or fallback procedures
Data Source
AI summary
A UE for handling communication in a wireless communication network, wherein PUCCH overlaps one or more PUSCH, on one or multiple carriers with at least one symbol. The UE is configured to multiplex one or more UCI to a radio network node, with a PUSCH or with resources of a configured grant, CG, based on whether or not a condition has been fulfilled. The condition relates to: a priority of a CG transmission relative a dynamic PUSCH transmission; a priority of a CG transmission relative other CG transmissions; allowance to carry any UCI in CG resources; presence of media access control, MAC, protocol data unit, PDU, for uplink, UL, transmission; if UCI is scheduled for transmission at a time as PUSCH, the UCI is multiplexed onto the PUSCH; CG size; failure rate of PDCCH; and/or whether dynamically scheduled uplink grant and CG are present.