Random Access Channel Bandwidth Adaptation for Satellite Terminals
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Solution Overview
Problem
The minimum bandwidth defined in the ground 5G system is too large for satellite terminals at low power levels, making it impossible for them to access the network effectively.
Innovation Solution
The method involves obtaining parameter information and time-frequency resource allocation for multiple random access channels, selecting target parameters based on the access device's capability and operating scenario, and configuring the random access channel to match the satellite terminal's power level, ensuring a suitable signal-to-noise ratio by approximating parameters to those used in the ground 5G system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the minimum bandwidth defined in the ground 5G system is used, then the system can meet the requirements of ground 5G communication, but satellite terminals at low power levels cannot access the network effectively
Solution Approach 1:
The patent introduces dynamic random access channel bandwidth selection mechanisms, allowing the system to adapt between different bandwidth configurations (first bandwidth for high power, second bandwidth for low power) based on terminal capabilities and network conditions, rather than using a fixed minimum bandwidth
Solution Approach 2:
The patent changes the bandwidth parameter of the random access channel from a fixed value to a selectable set of values, enabling the system to adjust the bandwidth parameter according to terminal power levels and match them appropriately for effective network access
2Adaptability or versatility
If multiple random access channel bandwidth options are provided, then low power satellite terminals can access the network, but the system complexity increases
Solution Approach 1:
The patent segments the random access channel configuration into multiple discrete bandwidth options (first random access channel bandwidth and second random access channel bandwidth), allowing terminals to select from predefined segments rather than dealing with continuous or overly complex configuration spaces
Solution Approach 2:
The patent creates a universal random access channel configuration framework that serves multiple functions: supporting both high power and low power terminals, maintaining compatibility with ground 5G systems, and enabling future extensions to different power levels without requiring complete redesign
Data Source
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AI summary
Methods for selecting and configuring a random access channel, an access device and a network device are provided. The method includes: obtaining parameter information and time-frequency resource allocation information corresponding to at least two types of random access channels, the parameter information including a subcarrier spacing and a preamble sequence, a random access channel bandwidth obtained in accordance with the subcarrier spacing and a length of the preamble sequence being smaller than or equal to a maximum transmission bandwidth of a satellite access device, the subcarrier spacing including a reference value of a maximum frequency offset to be resisted by a satellite system; selecting target parameter information from the parameter information in accordance with a capability and an operating scenario of the access device and a frequency offset proportion of each random access channel; and selecting a random access channel in accordance with the target parameter information, and transmitting a random access signal in accordance with the time-frequency resource allocation information.