Uplink Full-Power Transmission for NR Coverage Using Dynamic Scaling
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Solution Overview
Problem
In New Radio (NR) Rel 15, the physical uplink shared channel (PUSCH) power scaling for codebook-based transmission results in uplink non-full-power sending, affecting coverage and limiting uplink performance.
Innovation Solution
An uplink full-power transmission method that scales transmit power using a power scaling coefficient based on factors such as the terminal device's full-power transmission capability, reported TPMI, network-delivered TPMI, working mode, and SRS resource configuration, enabling improved uplink power and coverage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If PUSCH power scaling divides power equally among antenna ports based on SRS antenna port ratio, then power distribution is simplified, but uplink coverage is limited due to non-full-power transmission
Solution Approach 1:
The patent changes the power scaling parameter from a fixed ratio-based approach to a dynamic approach that considers the actual number of non-zero antenna ports and their individual power requirements. This allows the system to adapt power distribution to achieve full-power transmission while maintaining manageable complexity through standardized calculation procedures.
2Adaptability or versatility
If partial TPMI is used for codebook-based transmission, then transmission flexibility is improved, but full-power transmission cannot be achieved
Solution Approach 1:
The patent introduces dynamic power scaling that adapts to the configured TPMI and actual antenna port usage. The power scaling coefficient is calculated based on the ratio of non-zero antenna ports to total configured ports, allowing the system to dynamically adjust power distribution to achieve full-power transmission while maintaining the flexibility of partial TPMI configurations.
3Device complexity
If PUSCH power is scaled based on SRS antenna port ratio, then power control is standardized, but uplink performance is limited
Solution Approach 1:
The patent modifies the power control parameters by introducing a new calculation method that uses the actual number of non-zero antenna ports and the configured maximum ports. This changes the scaling coefficient from a simple SRS port ratio to a more accurate reflection of actual transmission requirements, improving uplink performance while maintaining standardized control procedures.
Data Source
AI summary
An uplink full-power transmission method and a device. The method is applied to a terminal device and includes: performing uplink transmission based on an uplink transmit power obtained through scaling by a power scaling coefficient, where the power scaling coefficient is determined based on a power control factor, and the power control factor includes at least one of the following: an uplink full-power transmission capability of the terminal device, a supported transmission precoding matrix indicator TPMI reported by the terminal device, a TPMI delivered by a network device, a working mode reported by the terminal device, or the number of antenna ports for each SRS resource in a sounding reference signal SRS resource set that is configured by the network device based on the working mode.