Uplink Power Control for Multi-Antenna Terminals
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Some terminals in communication systems cannot reach maximum uplink transmission power during multi-antenna transmission, leading to reduced coverage and increased costs due to inefficient power scaling methods.
Innovation Solution
An uplink power control method that maintains the transmission power unchanged under specific precoding indications, allowing terminals with non-coherent or partial coherent transmission capabilities to achieve maximum power and improve coverage without requiring all antennas to reach maximum output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If uplink transmission power is scaled according to the proportion of non-zero PUSCH transmission ports to total configured ports, then implementation cost is reduced, but maximum transmission power cannot be reached during low-rank transmission
Solution Approach 1:
The patent introduces dynamic power scaling behavior that adapts to different transmission scenarios. When codebook-based transmission with full coherent capability is detected, no power scaling is applied (scaling factor = 1). For other scenarios, power scaling according to antenna port proportion is applied. This dynamic adaptation resolves the contradiction by allowing maximum power when needed while reducing cost in other cases.
Solution Approach 2:
The patent changes the power scaling parameter based on transmission mode and terminal capability. The scaling factor is set to 1 for codebook-based full coherent transmission, and to the proportion of non-zero ports for other cases. This parameter change enables the system to achieve maximum transmission power when required while maintaining cost efficiency in other operating conditions.
2Adaptability or versatility
If power scaling is applied according to antenna port proportion, then terminals with limited coherent transmission capability can operate, but coverage is reduced due to inability to reach maximum power at low ranks
Solution Approach 1:
The patent implements dynamic power scaling that adapts to the terminal's coherent transmission capability and transmission mode. Terminals with full coherent capability using codebook-based transmission receive full power (scaling factor = 1), while other terminals/scenarios apply proportional scaling. This ensures compatibility across different terminal types while maximizing coverage for capable terminals.
Solution Approach 2:
The patent applies different power scaling qualities to different transmission scenarios. Codebook-based full coherent transmission receives full power quality, while other scenarios receive scaled power quality. This local differentiation ensures that terminals capable of reaching maximum power actually do so, improving coverage, while other terminals operate within their capabilities.
3Power
If all antennas are required to reach maximum output power, then maximum transmission power is achieved, but implementation cost increases
Solution Approach 1:
The patent introduces dynamic power allocation that requires maximum power only when the terminal has full coherent capability and uses codebook-based transmission. In other cases, power is scaled according to the proportion of active antenna ports. This dynamic requirement reduces implementation cost while maintaining maximum power capability when needed.
Solution Approach 2:
The patent changes the power allocation parameter based on terminal capability and transmission mode. The scaling factor is set to 1 only for codebook-based full coherent transmission, and to the proportion of non-zero ports otherwise. This parameter change reduces the requirement for all antennas to reach maximum power, lowering implementation cost while preserving maximum power capability when required.
Data Source
Figure 1~3
Figure 4~6
AI summary
An uplink power control method, a terminal, and a network device are provided, which relates to the field of communications, and is to solve a problem that the terminal cannot reach a maximum transmission power for codebook-based or non-codebook-based uplink multi-antenna transmission in related technologies. The method includes: obtaining an uplink precoding indication; and controlling a value of an uplink transmission power determined according to a power control procedure to remain unchanged, in a case that the uplink precoding indication corresponds to a target precoding indication. Based on the solution of the present disclosure, it is ensured that the maximum uplink transmission power can be reached under part of precoding indications, the coverage of uplink transmission can be improved, and it is not required that all antennas of the terminal can reach the maximum transmission power, thereby reducing the cost.