Random Access Resource Configuration for 5G NR
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Solution Overview
Problem
In 5G NR communications, the existing PRACH configurations in frequency bands below 6 GHz are not directly applicable to other frequency bands or systems, leading to a low number of valid random access occasions and reduced random access efficiency for terminal devices.
Innovation Solution
A communication method that configures random access resources to avoid collisions with SSB and RMSI CORESET resources, thereby increasing the number of valid random access occasions and improving random access efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If existing PRACH configurations in frequency bands below 6 GHz are applied to other frequency bands or systems, then device complexity is reduced, but random access efficiency deteriorates due to resource collisions
Solution Approach 1:
The patent applies local quality by configuring PRACH parameters specifically adapted to different frequency bands and system types. Instead of using a universal configuration, the network device determines PRACH configuration based on the specific characteristics of the frequency band (below 6 GHz, above 6 GHz, FDD, TDD) and system type (NR, LTE-NR dual connectivity), ensuring optimal random access performance for each local context while managing complexity through standardized determination rules.
Solution Approach 2:
The patent implements parameter changes by dynamically adjusting PRACH configuration parameters including subcarrier spacing, cyclic prefix length, random access occasion positions, and preamble formats based on the frequency band and system type. These parameter changes ensure that PRACH resources do not collide with SSB and RMSI CORESET resources, thereby improving random access efficiency across different deployment scenarios.
2Productivity
If PRACH configuration parameters are optimized for specific frequency bands, then random access efficiency is improved, but adaptability deteriorates
Solution Approach 1:
The patent achieves universality by establishing a unified PRACH configuration determination mechanism that works across multiple frequency bands (below and above 6 GHz) and system types (NR standalone, LTE-NR dual connectivity). The network device uses a standardized approach to determine PRACH parameters based on received configuration information, enabling the same mechanism to serve multiple functions and scenarios without requiring separate optimization for each case.
Solution Approach 2:
The patent implements dynamics by making PRACH configuration adaptable to different scenarios through received configuration information. The network device can dynamically adjust PRACH parameters based on the specific frequency band, system type, and resource availability, allowing the configuration to evolve and adapt to changing network conditions while maintaining a structured determination process.
3Productivity
If random access occasions are increased to improve access efficiency, then random access efficiency is improved, but resource collision probability increases
Solution Approach 1:
The patent applies preliminary action by determining PRACH configuration parameters in advance based on the frequency band and system type before actual random access occurs. The network device pre-configures PRACH occasions, subcarrier spacing, and cyclic prefix lengths to avoid collisions with SSB and RMSI CORESET resources. This preliminary configuration ensures that when terminal devices perform random access, they use resources that have been pre-validated to avoid collisions, thereby improving both efficiency and reliability.
Data Source
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AI summary
This application provides a random access resource configuration method and a communications device. The method includes: receiving, by a terminal device, index indication information, where the index indication information is used to indicate a first configuration index; determining, by the terminal device based on the first configuration index, first configuration information corresponding to the first configuration index, where the first configuration information is used to indicate a time domain resource for a first group of random access preamble occasions ROs or a time domain resource for a second group of ROs; the time domain resource for the first group of ROs and the time domain resource for the second group of ROs are located in a first time unit in a random access configuration period; and the time domain resource for the first group of ROs or the time domain resource for the second group of ROs is determined based on a time domain offset of the control channel resource set and/or an index of the first time unit; and determining, by the terminal device, a time domain resource for one group of ROs, where the time domain resource for the group of ROs is the time domain resource for the first group of ROs or the time domain resource for the second group of ROs. According to embodiments of this application, random access efficiency of the terminal device can be improved.