Random Access Parameter Configuration for Satellite Resource Efficiency
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Solution Overview
Problem
In non-terrestrial communication, the large round-trip delay between a user terminal and a satellite leads to time-frequency resource waste due to interference between uplink data from terminals with and without positioning functions, as they occupy twice the required resources to avoid mutual interference.
Innovation Solution
A method where a network device determines and sends specific random access parameters to terminals with and without positioning functions, ensuring overlapping time-frequency resources, thereby reducing the occupied range and waste.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate time-frequency resources are allocated to terminals with and without positioning functions to avoid interference, then interference between uplink data is avoided, but time-frequency resource waste increases as resources are occupied twice
Solution Approach 1:
The patent merges the time-frequency resources for random access preambles from terminals with and without positioning functions by adjusting their starting positions and lengths. Terminals with positioning functions use a first random access preamble with a first starting position and first length, while terminals without positioning functions use a second random access preamble with a second starting position and second length. Through parameter configuration, these preambles are made to overlap in the time-frequency domain, allowing both types of terminals to share the same time-frequency resources for random access, thereby eliminating the need for separate resource allocation and reducing resource waste while avoiding interference through proper parameter design
2Loss of substance
If the same time-frequency resources are shared by terminals with and without positioning functions, then resource waste is reduced, but interference between uplink data occurs
Solution Approach 1:
The patent applies local quality by differentiating the random access preamble parameters for terminals with and without positioning functions. Specifically, terminals with positioning functions are configured with a first random access preamble having a first starting position and first length, while terminals without positioning functions are configured with a second random access preamble having a second starting position and second length. This localized parameter differentiation allows both groups to share the same time-frequency resources while maintaining orthogonality or non-interference through carefully designed parameter relationships, thus achieving resource efficiency without sacrificing interference avoidance
Data Source
AI summary
Example random access methods and apparatus are described. In one example, the network device obtains a first random access preamble length of a first terminal device and a second random access preamble length of a second terminal device. The network device determines a first random access parameter of the first terminal device and a second random access parameter of the second terminal device based on the first random access preamble length and the second random access preamble length. The network device sends the first random access parameter and the second random access parameter to the first terminal device and the second terminal device respectively.