SSB-Based PRACH Resource Mapping for Repeated NR Transmission
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Solution Overview
Problem
The New Radio (NR) system does not support repeated transmission of Physical Random Access Channel (PRACH), necessitating a method for determining PRACH resources to enable repeated transmission.
Innovation Solution
A method for determining a plurality of PRACH resources corresponding to a first synchronization signal block (SSB) and selecting target PRACH resources for repeated transmission, utilizing configuration and indication information to optimize resource allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If PRACH repeated transmission is not supported in NR system, then the system complexity is reduced, but the transmission reliability and coverage are worsened
Solution Approach 1:
The PRACH transmission process is segmented into multiple independent transmission attempts, each using separately determined PRACH resources. The terminal device determines multiple PRACH resources corresponding to a first SSB and selects target resources for repeated transmissions, dividing the transmission task into discrete segments that can be independently managed and retried.
Solution Approach 2:
The patent performs preliminary determination of multiple PRACH resources before actual transmission begins. By pre-determining multiple PRACH resources corresponding to the first SSB and selecting target resources in advance, the system prepares multiple potential transmission paths beforehand, enabling reliable repeated transmission without adding runtime complexity.
2Reliability
If multiple PRACH resources are determined for repeated transmission, then the transmission reliability is improved, but the resource allocation complexity increases
Solution Approach 1:
The patent applies local quality by determining PRACH resources specifically associated with a first SSB (synchronization signal block). Rather than managing all PRACH resources system-wide, the method focuses resource determination locally around the first SSB, selecting target PRACH resources from those locally determined resources. This localized approach improves reliability for SSB-related transmissions while containing allocation complexity to a specific local context.
3Area of stationary object
If PRACH repeated transmission is enabled, then the frequency band coverage is expanded, but the time delay increases
Solution Approach 1:
The patent implements dynamic selection of target PRACH resources from multiple determined resources. The terminal device dynamically determines which target PRACH resources to use for repeated transmission based on the first SSB conditions. This dynamic resource selection enables flexible adaptation to different transmission scenarios, expanding effective coverage while managing time delays through optimized resource utilization rather than fixed resource allocation.
Data Source
AI summary
Disclosed are a resource determination method and apparatus, and a device and a storage medium, which relate to the field of mobile communications. The method comprises: determining a plurality of physical random access channel (PRACH) resources corresponding to a first synchronization signal block (SSB); and determining a plurality of target PRACH resources from among the plurality of PRACH resources, wherein the plurality of target PRACH resources are used for performing repeated PRACH transmission. Provided is a method for determining a PRACH resource, which can realize repeated PRACH transmission.