Wireless PRACH Repetition Scheduling for Conflict-Free RO Sets
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Solution Overview
Problem
The existing PRACH mask index in wireless communication systems is unable to effectively indicate all possible RO sets for PRACH transmissions with multiple preamble repetitions, leading to conflicts with other random access mechanisms and limited resource allocation.
Innovation Solution
A method for determining the start RO in an RO set based on the PRACH mask index, SSB index, and number of preamble repetitions, allowing flexible and conflict-free resource allocation for PRACH transmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the PRACH mask index is used to indicate the RO set for multiple preamble repetitions, then the coverage performance is enhanced, but the PRACH mask index cannot indicate all RO sets and conflicts with other random access mechanisms
Solution Approach 1:
The patent segments the RO set indication into two parts: the PRACH mask index indicates a starting RO index, and the number of preamble repetitions parameter indicates the size of the RO set. This segmentation allows the system to indicate larger and more flexible RO sets while maintaining compatibility with existing random access mechanisms.
Solution Approach 2:
The patent introduces a new dimension by making the RO set size dynamic based on the number of preamble repetitions. Instead of using a fixed-size RO set, the system now allows the RO set size to vary with the repetition count, enabling more flexible resource allocation and resolving the limitation of the traditional PRACH mask index.
2Device complexity
If the PRACH mask index indicates a fixed RO set, then the resource allocation is simple, but it conflicts with PRACH transmission in other random access mechanisms
Solution Approach 1:
The patent makes the RO set dynamic by linking its size to the number of preamble repetitions. The RO set now adapts its size based on the random access mechanism being used, allowing CFRA to use smaller RO sets while CBRA can use larger RO sets, thereby avoiding conflicts between different random access mechanisms.
Solution Approach 2:
The patent changes the parameter that determines RO set size from a fixed value to a dynamic value based on the number of preamble repetitions. This parameter change allows the system to flexibly adjust RO set size according to different random access scenarios, resolving conflicts between CFRA and CBRA while maintaining simple resource allocation through the PRACH mask index.
3Adaptability or versatility
If multiple RO sets are supported for different SSB indexes, then the system flexibility is improved, but the PRACH mask index cannot effectively indicate all possible RO sets
Solution Approach 1:
The patent segments the indication information into two parts: the PRACH mask index provides the starting position, and the number of preamble repetitions parameter provides the RO set size. This segmentation allows the system to indicate multiple RO sets for different SSB indexes without losing information, as the combination of these two parameters can uniquely identify any RO set.
Solution Approach 2:
The patent adds a new dimension to the indication by using the number of preamble repetitions to determine RO set size. This additional dimension expands the indication capability, allowing the PRACH mask index to effectively indicate multiple RO sets for different SSB indexes while maintaining system flexibility.
Data Source
AI summary
The present application provides a method for wireless communication and an apparatus. One example method includes: receiving first signalling, where the first signalling includes a first PRACH mask index; and transmitting a first PRACH transmission on a first RO set, where the first RO set includes Nr ROs, the first PRACH transmission includes Nr preamble repetitions, the Nr ROs in the first RO set are consecutive in time domain, a first SSB index is one of a plurality of SSB indexes, the Nr ROs in the first RO set are associated with the first SSB index, a start RO in the first RO set is related to a quantity of the plurality of SSB indexes, the first SSB index, Nr, and the first PRACH mask index, and Nr is a positive integer greater than 1.