Height-Based Preamble Masking for Spatial Terminal Random Access
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Solution Overview
Problem
In communication systems, especially those serving terminal devices at different heights such as UAVs, high-altitude platforms, and low-earth orbiting satellites, the random access process faces challenges due to collisions and conflicts between preamble sequences, leading to a low success rate and efficiency.
Innovation Solution
A random access method where a spatial terminal sends a first random access message carrying a preamble sequence generated based on a target mask associated with its height, thereby avoiding collisions with preamble sequences used by terminals at other heights, improving the success rate and efficiency of random access.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the same preamble sequence is used by terminal devices at different heights, then the device complexity is reduced, but the reliability of random access deteriorates due to collisions and conflicts
Solution Approach 1:
The patent divides the preamble sequence space into different segments based on terminal device height. Terminal devices are segmented into multiple height groups, and each group is assigned a dedicated preamble sequence set. This segmentation prevents interference between different height groups while maintaining manageable complexity through structured allocation.
Solution Approach 2:
The patent applies local quality by assigning different preamble sequence characteristics to different height groups. Each height group receives tailored preamble sequences optimized for its specific operational characteristics, allowing terminal devices at different heights to use appropriate sequences without causing collisions.
2Reliability
If height-based preamble sequence differentiation is implemented, then the reliability of random access is improved, but the device complexity increases due to multiple mask configurations
Solution Approach 1:
The patent implements universality by designing a multi-functional mask structure that serves multiple purposes. The same mask framework is used for different height groups, and the masks are constructed using standardized sequences and modulation techniques, reducing the need for entirely different configurations for each height category.
Solution Approach 2:
The patent applies nesting by organizing the mask structure in a hierarchical manner. Base masks are defined for different height groups, and these base masks are then nested with additional modulation codes to create the final preamble sequences. This nested structure allows efficient generation of multiple sequences from a smaller set of base elements.
Data Source
AI summary
Embodiments of the present disclosure disclose a random access method and a random access device, and relate to the field of communication technology. The method includes: first random access message is sent to a network device by a spatial terminal, where the first random access message carries a first preamble sequence, the first preamble sequence is generated based on a target mask, and the target mask is associated with a height where the spatial terminal is located; and a response message from the network device is received. In this way, the spatial terminal may initiate the random access using the first preamble sequence associated with the height where the spatial terminal is located, thereby avoiding collision and conflict with preamble sequences used by the spatial terminals at other heights, improving success rate of random access of the spatial terminal, and further improving efficiency of the random access.