Feature-Based PRACH Resource Selection for 5G Random Access
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Solution Overview
Problem
Current 5G NR random access procedures face inefficiencies in resource allocation and feature request handling, particularly in determining appropriate PRACH resources based on RSRP thresholds and SSB selection, which can lead to incorrect selection of repetitions and SSBs, affecting coverage and compatibility with legacy devices.
Innovation Solution
A method and system for user equipment (UE) and network nodes to determine PRACH resources based on received configurations and measurements, including RSRP thresholds and SSB selection, to indicate feature requests such as Msg3 repetition, allowing for efficient resource allocation and feature enablement while ensuring compatibility with legacy devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If PRACH resources are allocated based on RSRP thresholds and SSB selection, then resource allocation efficiency is improved, but incorrect selection of repetitions and SSBs occurs, affecting coverage
Solution Approach 1:
The patent introduces a new parameter 'feature requested indicator' that changes the decision-making process from solely RSRP-based to a multi-factor approach. This parameter indicates whether the UE requests enhanced features (like Msg3 repetition), thereby adjusting the PRACH resource selection criteria to balance efficiency with reliability for different service types.
Solution Approach 2:
The patent makes the PRACH resource selection process dynamic by allowing UEs to indicate feature requests based on their service type and coverage needs. The network node then dynamically adjusts the resource allocation strategy, switching between efficient allocation (for legacy devices) and reliability-enhanced allocation (for UEs requesting repetition or specific coverage).
2Reliability
If feature-based PRACH resource selection is implemented, then coverage for UEs requesting features is improved, but compatibility with legacy devices deteriorates
Solution Approach 1:
The patent applies local quality by treating different UE types differently based on their capabilities and requests. Legacy devices continue to use the standard RSRP-based selection without the feature indicator, while UEs requesting enhanced features (Msg3 repetition, specific coverage) trigger alternative resource allocation. This localized differentiation maintains compatibility where needed while providing enhanced functionality where requested.
Solution Approach 2:
The patent introduces the 'feature requested indicator' as an intermediary element that mediates between legacy compatibility and enhanced functionality. This indicator allows the network to identify when a UE needs enhanced features without breaking backward compatibility, as legacy devices simply ignore the additional indicator and continue using existing procedures.
Data Source
AI summary
The present disclosure is related to a user equipment (UE), a network node, and methods for a feature based PRACH transmission. A method at a user equipment (UE) for performing a random access procedure with a network node comprises: receiving a configuration for physical random access channel (PRACH) transmission; determining a first PRACH resource, which is to be used for the PRACH transmission and indicates whether a feature is requested or not, at least partially based on the received configuration and one or more measurements at the UE; and transmitting, to the network node, the PRACH transmission by using the first PRACH resource.