Two-Step Random Access With PRACH-Based PUSCH Repetition Signaling
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In two-step random access procedures, network devices struggle to determine whether physical uplink shared channel (PUSCH) transmissions associated with a random access request message are with or without repetition, due to the lack of clear differentiation between PRACH resources indicating repetition or non-repetition.
Innovation Solution
The method involves configuring distinct PRACH resources for PUSCH transmissions with and without repetition, allowing network devices to differentiate based on the specific PRACH resource used, and determining corresponding PUSCH resources through defined mapping ratios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the terminal device repeatedly transmits the MsgA for uplink coverage enhancement, then the uplink coverage is enhanced, but the network device cannot determine whether the PUSCH corresponding to the PRACH is transmission with repetition or transmission without repetition
Solution Approach 1:
The PRACH resources are segmented into first PRACH resources for indicating PUSCH transmission with repetition and second PRACH resources for indicating PUSCH transmission without repetition. This segmentation allows the network device to determine the transmission mode by identifying which type of PRACH resource was used, thereby resolving the information loss problem while maintaining coverage enhancement capabilities.
2Reliability
If the terminal device transmits random access message through first PRACH resource for PUSCH transmission with repetition, then the uplink coverage enhancement is achieved, but the device complexity increases due to resource differentiation and mapping ratio determination
Solution Approach 1:
The patent changes the parameter of PRACH resource type (first or second) to indicate the transmission mode. The terminal device determines the appropriate PRACH resource type based on coverage requirements and follows predefined mapping rules to determine corresponding PUSCH resources. This parameter-based approach simplifies the decision process compared to complex calculations, reducing terminal device complexity while maintaining reliability.
Data Source
AI summary
An access method, a communication apparatus and a module device are provided. The method includes: receiving configuration information from a network device, wherein the configuration information indicates one or more first physical random access channel (PRACH) resources configured to indicate a physical uplink shared channel (PUSCH) repetition, and one or more second PRACH resources configured to indicate a non-PUSCH repetition; transmitting a random access request message to the network device through the first PRACH resource in the case of the PUSCH repetition; and transmitting the random access request message to the network device through the second PRACH resource in the case of the non-PUSCH repetition.