Multi-PRACH RO Ordering for Uplink Coverage Extension
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Solution Overview
Problem
The challenge in wireless communication is the limited uplink coverage of the Physical Random Access Channel (PRACH), which is addressed by the Third Generation Partnership Project (3GPP) Release 18's development of multi PRACH transmission, requiring a solution for configuring Random Access Channel (RACH) occasions (RO) to ensure orderly multiple PRACH transmissions.
Innovation Solution
A method and apparatus for determining the position order of PRACH transmissions based on the position order of RACH occasions (ROs), ensuring consistent RO configuration between the terminal and network device to facilitate normal and orderly multi PRACH transmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multi PRACH transmission is implemented to improve uplink coverage, then the coverage capability is improved, but the complexity of configuring RACH occasions increases
Solution Approach 1:
The patent segments the RACH occasion configuration into two independent parts: time domain configuration (provides time information) and frequency domain configuration (provides frequency information). This segmentation allows each part to be configured independently, reducing the overall configuration complexity while enabling multi PRACH transmission for improved uplink coverage.
Solution Approach 2:
The patent makes the time domain and frequency domain configurations universal by allowing them to be independently configured and combined to form complete RACH occasion configurations. This multi-functionality approach enables flexible deployment of multiple PRACH transmissions without requiring complex unified configuration mechanisms.
2Reliability
If multiple PRACH transmissions are performed in one random access attempt, then the transmission reliability is improved, but the configuration precision of RO position order becomes more difficult
Solution Approach 1:
The patent segments the RO position order determination into two independent processes: time domain RO position order determination and frequency domain RO position order determination. Each process operates independently with its own configuration parameters, ensuring precise control over the position order of multiple PRACH transmissions without complexity in coordinating them together.
Solution Approach 2:
The patent uses parameter changes by allowing independent configuration of time domain and frequency domain parameters. The time domain configuration provides time information while the frequency domain configuration provides frequency information, and their combinations create precise RO position orders for reliable multi PRACH transmission.
Data Source
AI summary
A multi physical random access channel (PRACH) method includes: in response to performing a multi PRACH transmission, determining a position order of respective PRACH transmissions in the multi PRACH transmission based on a position order of random access channel (RACH) occasions (ROs).