Cell Selection Using PMAX Parameters for 5G Uplink Power
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Solution Overview
Problem
Current 5G communication systems face challenges in cell selection and re-selection processes, particularly in managing uplink transmission power levels and ensuring reliable Semi-Persistent Scheduling (SPS) activation and deactivation signals, especially in high-frequency band environments like millimeter wave (mmWave), which affect data transmission efficiency and network reliability.
Innovation Solution
A method and apparatus for user equipment (UE) to perform cell selection and re-selection using PMAX parameters, including receiving maximum power information from a base station, calculating compensation parameters for uplink transmission power, and determining cell selection based on calculated reception levels, thereby enhancing the reliability of SPS activation and deactivation signals in shared SPS operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If cell selection and re-selection are performed using traditional methods without PMAX parameters, then the process is simpler, but the reliability of cell selection and uplink transmission power management deteriorates in 5G mmWave environments
Solution Approach 1:
The base station performs preliminary actions by determining and broadcasting multiple PMAX parameters (first PMAX for SIB1, second PMAX for SIB2, third PMAX for other SIBs) before the UE performs cell selection. This allows the UE to have accurate power level information available in advance, improving selection reliability without adding complex real-time calculations during cell search
Solution Approach 2:
The invention changes the parameter set used in cell selection from traditional single power level information to multiple PMAX parameters differentiated by SIB type. The UE calculates compensation parameters based on these multiple PMAX values and applies them when evaluating cell suitability, thereby improving reliability through more granular power management
2Measurement precision
If a single PMAX parameter is used for all SIBs, then the configuration is simpler, but the accuracy of uplink transmission power management deteriorates
Solution Approach 1:
Different PMAX parameters are assigned to different SIB types (first PMAX for SIB1, second PMAX for SIB2, third PMAX for other SIBs), allowing each SIB to have optimized power parameters tailored to its specific requirements. This local differentiation improves measurement precision for uplink power management
Solution Approach 2:
The single PMAX parameter is segmented into multiple distinct PMAX parameters based on SIB type. Each PMAX value is independently determined and broadcast, enabling precise control of uplink transmission power for different system information messages without managing a single complex parameter
3Productivity
If maximum transmission power levels are not differentiated by SIB type, then the configuration is simpler, but the efficiency of data transmission in mmWave bands deteriorates
Solution Approach 1:
The invention changes from using a single undifferentiated PMAX parameter to using multiple PMAX parameters specifically differentiated by SIB type. This parameter differentiation enables more efficient uplink power management for data transmission in mmWave bands, as each SIB can be transmitted with appropriate power levels
Solution Approach 2:
The base station performs preliminary determination of multiple PMAX parameters and includes them in system information broadcasts before data transmission begins. This preliminary configuration of differentiated power parameters enables efficient mmWave data transmission without requiring complex real-time power negotiations
Data Source
AI summary
The present disclosure relates to a communication method and system for converging a 5th Generation (5G) communication system for supporting higher data rates beyond a 4th Generation (4G) system with a technology for Internet of Things (IoT). The present disclosure may be applied to intelligent services based on the 5G communication technology and the IoT-related technology, such as smart home, smart building, smart city, smart car, connected car, health care, digital education, smart retail, security and safety services. A cell selection/re-selection method and an apparatus adapted thereto is provided. The cell selection method of a terminal includes: receiving, from a base station, first maximum power information, PEMAX1 and second maximum power information, PEMAX2, related to maximum transmission power levels of the terminal on the uplink; calculating a compensation parameter, Pcompensation, related to uplink transmission power of the terminal, using the first maximum power information and the second maximum power information; calculating a cell selection reception level value, Srxlev, using the compensation parameter; and selecting a cell based on the calculated cell selection reception level value.