PRACH Resource Sets for Low-Delay 5G NR Random Access
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Solution Overview
Problem
The existing Random Access Channel (RACH) process in the 5G New Radio (NR) system is not suitable for low-delay scenarios, leading to prolonged delays due to the need for four times of information interaction between the network device and the terminal device.
Innovation Solution
The method involves determining separate PRACH resource sets for different types of random access procedures, allowing the terminal device and network device to identify the appropriate procedure based on the PRACH resource set to which the target PRACH resource belongs, thereby reducing delay by optimizing resource allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If a unified PRACH resource set is used for all random access procedures, then resource allocation is simple, but delay increases due to four times information interaction
Solution Approach 1:
The patent segments the unified PRACH resource set into multiple type-specific PRACH resource sets (first type, second type, etc.), where each set is dedicated to a specific random access procedure type. This segmentation allows the network device and terminal device to quickly identify the appropriate resource set based on the procedure type, reducing the number of interaction rounds and minimizing random access delay, while the segmentation itself provides a structured approach that manages complexity.
Solution Approach 2:
The patent applies local quality by configuring different PRACH resource sets with distinct characteristics (different time-frequency resources, preamble sequences, or other parameters) optimized for specific random access procedure types. Each local resource set has quality attributes tailored to its intended use case, enabling efficient handling of different procedure types without compromising overall system performance.
2Productivity
If separate PRACH resource sets are configured for different random access procedure types, then random access speed improves, but resource configuration complexity increases
Solution Approach 1:
The patent divides PRACH resources into multiple segmented sets corresponding to different random access procedure types. This segmentation enables parallel processing of different procedure types simultaneously, as each type has its dedicated resource set, thereby improving overall random access processing speed while organizing complexity into manageable segments.
Solution Approach 2:
The patent implements preliminary action by pre-configuring multiple type-specific PRACH resource sets before random access occurs. The network device prepares these distinct resource sets in advance, each optimized for specific procedure types, so that when a terminal device needs to perform random access, the appropriate pre-configured resources are immediately available, eliminating the need for dynamic resource allocation and improving processing speed.
3Reliability
If four times information interaction is required for random access, then protocol compatibility is maintained, but delay is prolonged
Solution Approach 1:
The patent segments the random access procedure into type-specific categories, where each type has dedicated PRACH resources. This segmentation allows certain procedure types to utilize optimized resource allocation that reduces the number of interaction rounds required, thereby reducing delay while maintaining protocol compatibility through the structured segmentation approach.
Solution Approach 2:
The patent applies parameter changes by modifying PRACH resource parameters (time-frequency resources, preamble sequences, etc.) based on the random access procedure type. By changing these parameters according to the specific procedure type, the system can optimize performance for each type, reducing delay for time-sensitive procedures while maintaining overall protocol compatibility through consistent parameter management.
Data Source
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AI summary
Random access method, terminal device, network device, and storage medium Disclosed is a random access method, comprising: a terminal device determines a first physical random access channel (PRACH) resource set and a second PRACH resource set, the first PRACH resource set being used for the PRACH sending during a first-type random access process, the second PRACH resource set being used for the PRACH sending during a second-type random access process, at least one of first PRACH resources comprised in the first PRACH resource set being different from second PRACH resources comprised in the second PRACH resource set; the terminal device determines a target PRACH resource from the first PRACH resource set or the second PRACH resource set, the target PRACH resource being used for the PRACH sending during a random access process. Also disclosed are another random access method, a terminal device, a network device, and a storage medium.