Random Access Subcarrier Spacing Adaptation for 5G Network Entry
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Solution Overview
Problem
Current communication systems face challenges in accessing a network that supports multiple subcarrier spacings, particularly in scenarios with diverse terminal device requirements and deployment scenarios, as existing methods lack efficient mechanisms for terminal devices to identify and utilize appropriate subcarrier spacings for random access.
Innovation Solution
A communication method where terminal devices receive synchronization and system information signals based on multiple subcarrier spacings, allowing them to determine and feedback the subcarrier spacing used for uplink and downlink signals, enabling flexible access to networks with multiple subcarrier spacings, and reducing communication collisions by reporting identification information and receiving configuration information for optimized network access.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a network supports multiple subcarrier spacings to accommodate diverse terminal requirements, then the adaptability and versatility of the communication system is improved, but the complexity of the random access procedure increases due to the need for terminal devices to identify and select appropriate subcarrier spacings
Solution Approach 1:
The network device pre-configures and indicates multiple subcarrier spacing configurations to the terminal device before the random access procedure. The terminal device uses these pre-indicated configurations to determine the appropriate subcarrier spacing for sending the random access request, avoiding complex real-time decisions during the access procedure.
Solution Approach 2:
The patent changes the parameter of subcarrier spacing dynamically based on network configuration and terminal capability. The network device indicates different subcarrier spacing configurations (first, second, third configurations) that the terminal device can select from, allowing the system to adapt to different scenarios without increasing procedural complexity.
2Productivity
If terminal devices send random access requests using different subcarrier spacings, then the productivity and communication efficiency are improved, but the risk of communication collisions increases without proper coordination mechanisms
Solution Approach 1:
The network device provides feedback to the terminal device by indicating which subcarrier spacing configurations are available and appropriate for random access. The terminal device uses this feedback information to select the correct subcarrier spacing, ensuring coordinated access and preventing collisions between terminals using different spacings.
Solution Approach 2:
The random access procedure is designed to be universal across multiple subcarrier spacing configurations. The same random access procedure can be used regardless of which subcarrier spacing configuration is selected, as the network device manages the mapping between configurations and procedures, allowing one procedure to serve multiple functions across different spacings.
Data Source
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AI summary
This application discloses a communication method and a device. The method includes: receiving, by a terminal device from a network device, a synchronization signal and a system information signal that are generated based on a first subcarrier spacing; sending a random access request signal to the network device based on the second subcarrier spacing and a first transmission resource, where a type of the first transmission resource corresponds to a third subcarrier spacing and/or a fourth subcarrier spacing; and receiving, from the network device, a random access response signal generated based on the fourth subcarrier spacing, where the random access response signal is used for instructing the terminal device to access a network or the random access response signal is used for instructing the terminal device to prepare to access the network. The communication method and the device provided in this application can support cell search for and random access to a network using a plurality of subcarrier spacings.