PRACH RO Grouping for Reliable Random Access Repetitions
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Solution Overview
Problem
The challenge in wireless communication networks is determining valid random access channel occasions (ROs) for multiple PRACH transmissions, particularly in scenarios where collisions and beamforming issues lead to inefficiencies and potential loss of PRACH transmissions.
Innovation Solution
A method and apparatus for determining a set of starting ROs for PRACH transmissions based on valid ROs, independent of collision handling rules, and configuring RO groups for multiple PRACH transmissions, ensuring efficient and reliable communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple PRACH transmissions are performed using multiple RO groups, then the reliability of random access is improved, but the complexity of determining valid ROs and managing RO groups increases
Solution Approach 1:
The patent divides the set of ROs into multiple RO groups, where each group contains a specific number of ROs (e.g., 4 ROs per group). This segmentation allows the system to manage multiple PRACH transmissions systematically by associating each transmission with a specific RO group, thereby improving reliability while maintaining manageable complexity through structured organization.
Solution Approach 2:
The patent performs preliminary determination of valid ROs and their grouping before actual PRACH transmissions occur. By pre-identifying which ROs are valid (not colliding with other transmissions) and organizing them into groups in advance, the system reduces the complexity of real-time decision-making while ensuring reliable transmission opportunities are available.
2Productivity
If RO groups are configured for multiple PRACH transmissions, then the efficiency of random access is improved, but the difficulty of detecting and measuring valid ROs increases
Solution Approach 1:
The patent applies different properties to different RO groups based on their validity status. Valid RO groups (those without collisions) are identified and marked for use, while invalid groups are excluded. This local differentiation simplifies the detection process by focusing measurements and transmissions only on the valid subsets of ROs, thereby improving efficiency without overwhelming complexity.
Solution Approach 2:
The system uses feedback from collision detection results to identify valid ROs and organize them into usable groups. By monitoring which ROs experience collisions and which do not, the system dynamically determines valid RO groups for future transmissions, improving efficiency through learned patterns while managing detection difficulty through systematic feedback processing.
Data Source
AI summary
A method includes determining, by a user device in a wireless network, at least one starting random access channel occasion (RO), wherein each of the at least one starting RO is a first valid RO of an RO set for a physical random access (PRACH) transmission with preamble repetitions, wherein the determining the at least one starting RO is based at least on valid ROs; determining, by the user device, an RO set for the PRACH transmission with preamble repetitions based on the determined at least one starting RO, the determined RO set including one of the at least one starting RO; and transmitting, by the user device to a network node, the PRACH transmission with preamble repetitions using the determined RO set.