PRACH Preamble Segmentation for RedCap UE Access
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Solution Overview
Problem
Current wireless communication systems, particularly in 5G NR, face challenges in efficiently configuring PRACH resources for RedCap UEs and other feature combinations, leading to increased collision probability and latency in initial access.
Innovation Solution
The proposed solution involves configuring PRACH resources specifically for feature combinations, including RedCap UEs, using a method that distinguishes between different feature combinations by associating unique PRACH preambles and MsgA PUSCH configurations, allowing for separate resource allocation and reduced collision probability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If PRACH resources are configured for multiple feature combinations including RedCap UEs, then the system can support diverse use cases, but the collision probability increases and initial access latency increases
Solution Approach 1:
The patent segments PRACH preambles into different sets (first set and second set) associated with different feature combinations. RedCap UEs use a specific set of preambles while other UEs use different sets, thereby reducing collision probability while maintaining support for diverse features through separate resource allocation
2Adaptability or versatility
If PRACH resources are configured for multiple feature combinations, then the system can accommodate various use cases, but initial access latency increases
Solution Approach 1:
By segmenting PRACH preambles into feature-specific sets, the patent enables faster initial access for RedCap UEs who can directly access their dedicated preamble set without interference or waiting, thereby reducing latency while maintaining versatility through separate configuration for different use cases
3Reliability
If separate PRACH preambles and MsgA PUSCH configurations are associated with specific feature combinations, then collision probability is reduced, but the device complexity increases
Solution Approach 1:
The patent segments PRACH preambles and MsgA PUSCH configurations into feature-specific sets, which reduces collision probability. The UE determines which configuration to use based on its identified feature combination, managing complexity through structured classification rather than unified handling of all features
Data Source
AI summary
A method by a user equipment (UE) for Message A (MsgA) transmission in a two-step Random Access (RA) procedure is provided. The method includes receiving, from a base station (BS), a Physical Random Access Channel (PRACH) configuration including sets of PRACH preambles, each set of PRACH preambles being associated with a feature or feature combination; receiving, from the BS, a first MsgA Physical Uplink Shared Channel (PUSCH) configuration associated with the PRACH configuration; receiving, from the BS, a second MsgAPUSCH configuration associated with a specific set of PRACH preambles; determining a first PRACH preamble associated with a specific feature or feature combination from the sets of PRACH preambles; determining a MsgA PUSCH corresponding to the first PRACH preamble depending on whether the first PRACH preamble is within the specific set of PRACH preambles; and transmitting, to the BS, the first PRACH preamble and the MsgA PUSCH.