Random Access Preamble Lengths by Sub-Coverage Area
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Solution Overview
Problem
In communication systems, the use of identical random access preamble lengths by terminal devices near and far from the network device leads to wastage of time-frequency resources, as the distance and Doppler effects are not considered, particularly in scenarios like terrestrial and non-terrestrial networks.
Innovation Solution
The method involves determining the target sub-coverage area based on Doppler information to assign varying random access preamble lengths, with closer devices using shorter preambles and farther devices using longer preambles, optimizing resource utilization by associating different preamble lengths with distance and Doppler characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If identical random access preamble lengths are used by all terminal devices in a cell, then simplicity of configuration is maintained, but time-frequency resources are wasted
Solution Approach 1:
The patent applies local quality by configuring different random access preamble lengths for different sub-coverage areas within a cell. Specifically, a first random access preamble length is configured for a first sub-coverage area and a second random access preamble length is configured for a second sub-coverage area, where the two lengths are different. This allows terminal devices to use appropriately sized preambles based on their location, reducing resource waste while maintaining manageable configuration complexity through structured area division.
Solution Approach 2:
The patent segments the cell coverage area into multiple sub-coverage areas (first sub-coverage area and second sub-coverage area) with different random access preamble length configurations. This segmentation enables differentiated resource allocation based on spatial location, allowing the system to optimize time-frequency resource usage by matching preamble lengths to specific geographic regions rather than using a uniform configuration across the entire cell.
2Reliability
If longer random access preambles are used to ensure coverage for distant devices, then coverage reliability is improved, but resource efficiency deteriorates for nearby devices
Solution Approach 1:
The patent implements local quality by assigning different random access preamble lengths to different sub-coverage areas based on their distance characteristics from the network device. Terminal devices in the first sub-coverage area use a first random access preamble length while devices in the second sub-coverage area use a second random access preamble length. This ensures that distant devices have sufficient preamble length for reliable access while nearby devices use shorter preambles, optimizing both coverage reliability and resource efficiency simultaneously.
3Productivity
If random access preamble length is adapted to distance, then resource utilization is improved, but system complexity increases
Solution Approach 1:
The patent manages system complexity through segmentation by dividing the coverage area into distinct sub-coverage areas with clearly defined random access preamble length configurations. The network device configures and indicates which sub-coverage area applies to which time-frequency resources, providing a structured framework that simplifies the adaptation process. Terminal devices follow straightforward rules to select appropriate preamble lengths based on their determined sub-coverage area, making the system manageable despite the differentiated configuration.
Data Source
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AI summary
Embodiments of this application provide a random access preamble transmission method, an apparatus, and a storage medium. The method includes: A terminal device determines, based on a target sub-coverage area to which the terminal device belongs in a preset coverage area of a network device, target random access preamble format information corresponding to the target sub-coverage area. Then, the terminal device sends, to the network device on a target time-frequency resource indicated by target random access preamble time-frequency resource information corresponding to the target random access preamble format information, a random access preamble corresponding to the target random access preamble format information. It may be learned that, in embodiments of this application, any terminal device may send a random access preamble based on a target sub-coverage area to which the terminal device belongs in the preset coverage area of the network device and by using random access preamble format information corresponding to the target sub-coverage area, so that time-frequency resources used to transmit the random access preamble can be saved.