Multi-PRACH Preamble Group Selection for Uplink Coverage
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Solution Overview
Problem
The bottleneck of uplink coverage in wireless communications is the physical random access channel (PRACH) transmission, which is addressed by the Third Generation Partnership Project (3GPP) Release 18 through multi-PRACH transmission solutions.
Innovation Solution
A method and apparatus for multi-PRACH transmission that allows terminals to select preambles from the same or different preamble groups during multiple PRACH transmissions, with network device indication or protocol agreement determining the preamble selection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional single-PRACH transmission is used, then the system is simple to implement, but the uplink coverage is limited
Solution Approach 1:
The patent segments the PRACH transmission into multiple independent transmission opportunities, where the terminal can select and transmit preambles in different PRACH occasions. This segmentation allows the system to improve coverage by providing multiple transmission attempts while maintaining manageable complexity through structured selection rules.
Solution Approach 2:
The patent introduces dynamic preamble selection mechanisms where the terminal device can adaptively choose preambles from available groups based on current transmission conditions. This dynamic approach enables the system to optimize coverage performance while managing complexity through protocol-defined selection algorithms rather than exhaustive search.
2Reliability
If multiple preambles are selected from different groups, then the transmission reliability is improved, but the preamble selection complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-dividing preambles into distinct groups and establishing selection rules before transmission occurs. The terminal device follows predefined procedures to select preambles from appropriate groups, which simplifies the operation compared to selecting from all preambles without structure. This preliminary organization enables reliable multi-preamble transmission while keeping the selection process manageable.
Solution Approach 2:
The patent changes the parameter of preamble selection by introducing group-based classification and selection criteria. Instead of selecting preambles from a single undifferentiated pool, the system changes the selection parameter to consider preamble groups, which reduces the effective search space and simplifies terminal operations while maintaining transmission reliability through diversified preamble choices.
3Productivity
If flexible preamble selection is allowed, then the resource utilization efficiency is improved, but the system complexity increases
Solution Approach 1:
The patent applies universality by designing a preamble selection mechanism that can adapt to different transmission scenarios using the same basic framework. The terminal device uses universal selection rules that work across multiple PRACH occasions and different preamble groups, enabling flexible resource utilization without requiring scenario-specific complex logic. This multi-functional approach improves productivity while managing system complexity.
Data Source
AI summary
A multi-physical random access channel (PRACH) transmission method includes: during respective PRACH transmissions in multi-PRACH transmission, determining preambles to be selected for the respective PRACH transmissions, in which, the preambles are from the same preamble group or different preamble groups.