Uplink Channel Power Allocation for 5G URLLC Reliability
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Solution Overview
Problem
In the 5G NR system, the existing power setting protocols inherited from 4G LTE systems fail to properly manage transmit power for channels like PUSCH, PUCCH, and PRACH, leading to inadequate transmission quality, especially for services requiring short latency and high reliability like URLLC.
Innovation Solution
A method where a terminal device sets transmit power for uplink channels based on channel priorities, ensuring that channels with higher priorities like PUSCH and PUCCH receive preferential power allocation even when overlapping with PRACH in the same time domain resource, optimizing power distribution to improve service transmission quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the terminal device follows the 4G LTE power setting protocol to allocate transmit power to multiple channels, then the power distribution follows the established protocol rules, but the transmission quality of high-priority services (URLLC) deteriorates due to insufficient power allocation
Solution Approach 1:
The patent implements dynamic channel priority adjustment based on service types. The terminal device determines priorities for different uplink channels (PUSCH, PUCCH, PRACH) according to the specific service requirements (eMBB, URLLC, MTC), allowing the power allocation strategy to adapt dynamically to different service scenarios rather than following fixed 4G protocols
Solution Approach 2:
The patent changes the key parameter of channel priority assignment to resolve the contradiction. By modifying how priorities are determined (from fixed 4G protocol rules to flexible service-based assignment), the system achieves both reliable URLLC transmission and broad service type adaptability in the 5G NR system
2Reliability
If the terminal device allocates equal power to all uplink channels in overlapping time domain resources, then the power distribution is simple and follows the maximum allowed transmit power limitation, but the transmission reliability of critical channels deteriorates
Solution Approach 1:
The patent applies local quality by assigning different power allocation treatments to different channels based on their specific priorities. High-priority channels (e.g., URLLC PUSCH) receive preferential power allocation while lower-priority channels receive remaining power, ensuring that critical transmissions get the quality of service they need without uniformly complicating the entire power management system
3Reliability
If the terminal device prioritizes PRACH transmission over PUSCH and PUCCH according to 4G protocols, then the random access process is ensured, but the transmission of high-priority uplink data and control information deteriorates due to power compression
Solution Approach 1:
The patent implements dynamic priority adjustment where the relative priority between PRACH and other uplink channels is not fixed but determined based on service types and transmission conditions. This allows the system to flexibly prioritize URLLC data transmission over random access in certain scenarios while maintaining random access reliability in others, resolving the contradiction between access reliability and data transmission efficiency
Data Source
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AI summary
This application provides an uplink transmission method and a terminal device. The method includes: setting, by a terminal device, a first transmit power for a first uplink channel based on a channel priority of the first uplink channel and a channel priority of a first physical random access channel PRACH, where the first uplink channel includes at least one of a physical uplink shared channel PUSCH and a physical uplink control channel PUCCH, a first time domain resource on which the first uplink channel is located and a second time domain resource on which the first PRACH is located overlap, the channel priority of the first uplink channel is higher than or equal to the channel priority of the first PRACH, and the first transmit power is greater than 0; and sending, by the terminal device, the first uplink channel at the first transmit power. Compared with an existing solution, in the method in this application, a transmit power is more preferentially set for a PUSCH and/or a PUCCH, so that service transmission quality can be improved.