Uplink Resource Allocation via PRACH Frequency Mapping
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Solution Overview
Problem
In next-generation communications systems like 5G, determining the appropriate uplink frequency domain resource for terminals with varying capabilities and requirements is challenging due to the need for flexible resource allocation without relying on the system bandwidth size.
Innovation Solution
A method where terminals determine a second frequency domain resource based on information related to a first frequency domain resource, such as index, location, bandwidth, or preamble parameters, allowing for flexible resource selection and reduced signaling overheads by using predefined mapping manners and indication information from the network device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the network device configures multiple uplink frequency domain resources for terminals with different capabilities and requirements, then the adaptability and versatility of the system is improved, but the device complexity and signaling overhead increase
Solution Approach 1:
The patent changes the parameter used for resource determination from system bandwidth size to PRACH frequency domain resource information. By using the frequency domain location of the PRACH resource (which is already configured for random access) as the basis for determining uplink data resources, the system achieves adaptability to different terminal capabilities without requiring complex separate configurations for each terminal type.
Solution Approach 2:
The patent makes the PRACH frequency domain resource serve multiple functions: it is used both for random access preamble transmission and as the basis for determining uplink data transmission resources. This multi-functional approach eliminates the need for separate resource configuration mechanisms, thereby reducing signaling overhead while maintaining adaptability.
2Device complexity
If the terminal determines uplink frequency domain resources based on system bandwidth size, then the resource allocation is simplified, but the adaptability to different terminal capabilities and service requirements is reduced
Solution Approach 1:
The patent changes the determination parameter from system bandwidth size to PRACH frequency domain location information. This parameter change enables the resource allocation mechanism to adapt to different terminal capabilities because the PRACH resource configuration can be flexibly adjusted based on terminal requirements, while the determination process remains simple for the terminal.
3Adaptability or versatility
If multiple uplink frequency domain resources are configured for different services and scenarios, then the adaptability to varied service requirements is improved, but the signaling overhead increases
Solution Approach 1:
The patent makes the PRACH frequency domain resource configuration serve dual purposes: random access and uplink data transmission resource determination. By using the same frequency domain location information for both functions, the system achieves service adaptability without requiring separate signaling for resource allocation, thereby reducing signaling overhead.
Solution Approach 2:
The patent merges the random access resource configuration and uplink data resource configuration into a single PRACH frequency domain resource configuration. This consolidation eliminates redundant signaling while maintaining the ability to adapt to different service requirements through flexible PRACH resource allocation.
Data Source
AI summary
This application provides a resource configuration method, a terminal, and a network device. The method includes: determining a second frequency domain resource based on a physical random access channel frequency domain resource used by a terminal to send a random access preamble, where the second frequency domain resource is used to transmit at least one of physical signal information or physical channel information. In embodiments of this application, when the network device configures a plurality of uplink frequency domain resources used to send a random access message 3, the terminal may determine a to-be-used uplink frequency domain resource according to the method provided in this application.