UCI Multiplexing on PUSCH for M-TRP Resource Efficiency
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Solution Overview
Problem
Efficient use of channel resources is a challenge in 5G NR communication, particularly for high frequency band communications, especially in multi-transmission-reception point (M-TRP) operation, especially concerning physical uplink control channel (PUCCH) and physical uplink shared channel (PUSCH) repetitions.
Innovation Solution
The solution involves a user equipment (UE) configured for M-TRP operation in 5G NR networks, where uplink control information (UCI) is multiplexed on a scheduled physical uplink shared channel (PUSCH) transmission, and PUCCH repetitions are dropped when they overlap with PUSCH transmissions, utilizing different transmit beams for PUCCH and PUSCH repetitions to exploit spatial diversity, and applying beam cycling to avoid resource waste.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If PUCCH repetition is used for M-TRP operation, then reliability of uplink control information transmission is improved, but channel resource utilization deteriorates due to overlapping with PUSCH transmissions
Solution Approach 1:
The patent merges UCI transmission from PUCCH with PUSCH data transmission by multiplexing UCI onto the PUSCH when they overlap in time. This combines two separate transmission functions into a single combined transmission, eliminating resource waste while maintaining reliable UCI delivery through the PUSCH's inherent redundancy and coverage.
Solution Approach 2:
The patent extracts the UCI transmission function from the PUCCH channel and relocates it to the PUSCH channel. By taking out the control information from its traditional PUCCH carrier and placing it on the data channel, the system eliminates the conflict between PUCCH and PUSCH transmissions, allowing both to use the same time resources efficiently.
2Reliability
If beam cycling is applied for PUCCH and PUSCH repetitions, then spatial diversity is improved, but device complexity increases due to multiple transmit beams configuration
Solution Approach 1:
The patent implements beam cycling as a periodic action where the UE sequentially uses different transmit beams for PUCCH and PUSCH transmissions across multiple time slots. This periodic switching between beams creates spatial diversity without requiring complex simultaneous beam management, as the system simply cycles through a predefined beam sequence.
Data Source
AI summary
A user equipment (UE configured for multi-Transmission-Reception Point (M-TRP) operation in a fifth-generation (5G) new radio (NR) network with DCI activated PUCCH repetition with TX beam cycling may multiplex UCI on a scheduled PUSCH transmission to a first TRP, multiplex the UCI on a scheduled PUSCH transmission to a second TRP and drop repetitions of the PUCCH when a first repetition of the PUCCH overlaps the scheduled PUSCH transmission to the first TRP and the second repetition of the PUCCH overlaps with a scheduled PUSCH transmission to the second TRP. For multiplexing the UCI and dropping the PUCCH repetitions, a timeline condition may also need to be satisfied.