PRACH Repetition RO Bundling for Lower Collision Random Access
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently utilizing random access occasions (ROs) for physical random access channel (PRACH) repetitions, particularly in challenging network conditions such as low signal strength or high interference, leading to inefficiencies in resource utilization and increased collision risks.
Innovation Solution
The proposed solution involves grouping ROs into bundles and mapping them to synchronization signal blocks (SSBs) for PRACH repetitions, allowing for flexible RO configurations and varying preamble sequences across repetitions to enhance detection probability and reduce collisions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If PRACH repetitions are transmitted using multiple ROs, then detection probability improves, but collision risk increases
Solution Approach 1:
The patent segments the RO bundle into multiple individual ROs that can be independently configured and assigned different preamble sequences. Each RO within the bundle operates as a separate transmission opportunity, allowing the system to distribute repetitions across multiple segmented resources rather than treating them as a single unit. This segmentation reduces collision risk while maintaining detection probability through diversified transmission paths.
Solution Approach 2:
The patent applies local quality by assigning different preamble sequences to different ROs within the bundle. Each RO can have customized preamble characteristics optimized for its specific transmission conditions. This local differentiation allows the system to adapt to varying channel conditions across different ROs, improving detection probability while managing collision risks through diversity.
2Productivity
If RO bundling is implemented for PRACH repetitions, then resource utilization efficiency improves, but system complexity increases
Solution Approach 1:
The patent implements a universal RO bundle structure that can accommodate multiple PRACH repetitions with different configurations. The bundle framework serves multiple functions: it organizes repetitions, manages preamble sequences, and provides a structured approach to resource allocation. This multi-functional design improves resource utilization efficiency while keeping the system manageable through a unified organizational structure.
Solution Approach 2:
The patent introduces dynamic configuration capabilities within the RO bundle, allowing the number of repetitions, preamble sequences, and RO assignments to be flexibly adjusted based on network conditions. This dynamic adaptability enables the system to optimize resource utilization in real-time while maintaining manageable complexity through standardized bundle management procedures.
3Object-affected harmful factors
If varying preamble sequences are used across ROs, then collision risk reduces, but configuration complexity increases
Solution Approach 1:
The patent employs periodic patterns in preamble sequence assignment across ROs within a bundle. By using systematic, periodic sequences rather than random assignments, the system reduces collision risk through predictable diversity while simplifying configuration management. The periodic structure allows for easier tracking and management of preamble sequences across multiple ROs.
Data Source
AI summary
A method for wireless communication at a user equipment (UE) and related apparatus are provided. In the method, the UE receives, from a network entity, a random access occasion (RO) configuration for an RO bundle. The RO bundle includes a first number of ROs over a time range, and each RO of the first number of ROs occupies a first frequency range. The UE further transmits, using the RO bundle, a set of physical random access channel (PRACH) repetitions. The set of PRACH repetitions includes one or more preambles. The number of repetitions in the set of PRACH repetitions is less than or equal to the first number of ROs in the RO bundle, and each PRACH transmission uses one RO of the first number of ROs.