Random Access Resource Determination in Wireless Terminal Devices
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Solution Overview
Problem
In the context of new-generation wireless communications technology (New Radio, NR), terminal devices face challenges with random access failures when the configuration parameters of the currently activated BWP differ from those of the initial BWP, leading to incorrect resource location determination and potential interference with other devices.
Innovation Solution
The proposed solution involves a random access method where the terminal device performs random access based on a first random access resource and a second configuration parameter, which are distinct from the configuration parameters of the currently activated BWP. This approach ensures that the terminal device can correctly determine the resource location for random access, improving success rates and reducing interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the terminal device performs random access based on the configuration parameters of the currently activated BWP, then the random access procedure can be completed, but the random access fails when the configuration parameters differ from the initial BWP
Solution Approach 1:
The terminal device stores configuration parameters of the initial BWP in advance before performing random access. When random access is triggered, the terminal device retrieves and uses these pre-stored initial BWP parameters rather than the currently activated BWP parameters, ensuring correct resource location determination even when the activated BWP has different configuration parameters.
2Productivity
If the terminal device uses the configuration parameters of the currently activated BWP for random access, then the procedure can proceed, but interference with other terminal devices occurs due to incorrect resource location
Solution Approach 1:
The initial BWP configuration parameters serve as an intermediary reference that mediates between the currently activated BWP and the random access resource locations. The terminal device uses these initial BWP parameters as a stable reference framework to correctly identify random access resources, preventing interference with other devices while maintaining procedure efficiency.
3Ease of operation
If the configuration parameters of the activated BWP are used, then data transmission can be performed, but the terminal device cannot determine the correct resource location for random access response and message 3
Solution Approach 1:
The BWP configuration is segmented into two distinct parts: the initial BWP configuration parameters (stored and used for random access) and the activated BWP configuration parameters (used for data transmission). This segmentation allows the terminal device to maintain data transmission capability on the activated BWP while separately using the initial BWP parameters for random access resource location detection, eliminating the conflict between the two functions.
Data Source
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AI summary
This application provides a random access method, a terminal device, and a network device, to increase a random access success rate. The method includes: performing, by a terminal device, data transmission based on a configuration parameter of a currently activated first bandwidth part BWP, where the configuration parameter of the first BWP includes at least one of a first resource offset, a first bandwidth, and a first subcarrier spacing; determining, by the terminal device, a first random access resource and a second configuration parameter that are used to perform random access, where the second configuration parameter includes at least one of a second resource offset, a second bandwidth, and a second subcarrier spacing; sending, by the terminal device, a random access request to the network device on the first random access resource; and receiving, by the terminal device, a random access response based on the second configuration parameter, where the random access response is sent by the network device based on the random access request.