5G Random Access Subcarrier Spacing Configuration

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Solution Overview

Problem

Current 5G NR standards lack a method to configure SubCarrier Spacing (SCS) for messages other than Msg.1 in the random access procedure, leading to undetermined SCS for various messages, which affects the operation of the 5G NR random access mechanism.

Innovation Solution

The proposed solution involves predetermining or configuring SCSs for different messages in the random access procedure by the network, allowing for distinct SCS configurations for Msg.1 to Msg.4 in contention-based mechanisms and Msg.0 to Msg.2 in contention-free mechanisms, ensuring proper operation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If uniform SCS configuration through RMSI is used for Msg.1, then configuration simplicity is improved, but SCS flexibility for other messages (Msg.2, Msg.3, Msg.4) deteriorates

Engineering Contradiction:

ImproveSCS configuration simplicityVSAvoidSCS configuration flexibility

Core Design Contradiction:

Ease of operationVSAdaptability or versatility

Solution Approach 1:

The patent segments the SCS configuration into multiple parts: Msg.1 SCS is configured through RMSI, while Msg.2, Msg.3, and Msg.4 SCS values are separately determined through specific mechanisms (using SCS of respective channels or explicitly configured values), allowing each message to have independent SCS configuration

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent introduces dynamic SCS configuration mechanisms where the SCS for different messages can be adaptively selected based on system conditions, PRACH configuration parameters, or explicit network configuration, rather than using a fixed uniform SCS for all messages

Inventive Principle:

Principle #15Dynamics

2Adaptability or versatility

If separate SCS configuration for each message is implemented, then SCS adaptability is improved, but configuration complexity deteriorates

Engineering Contradiction:

ImproveSCS configuration flexibilityVSAvoidSCS configuration complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent performs preliminary SCS configuration by establishing SCS values for Msg.2, Msg.3, and Msg.4 through pre-defined mechanisms (linking to PDSCH, PUSCH, or RAR SCS configurations) before the actual random access procedure executes, reducing runtime complexity

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent creates universal SCS determination rules that can be applied across different message types and random access scenarios, where the same configuration mechanisms serve multiple purposes for different messages, simplifying the overall configuration management

Inventive Principle:

Principle #6Universality (Multi-functionality)

Data Source

PatentUS11470648B2Random access method, base station and user equipment

Publication Date: 2022.10.11 DATANG MOBILE COMM EQUIP CO LTD

AI summary

A random access method, a base station and a User Equipment (UE) are provided. A random access method applied to a base station side includes: receiving, by using a pre-configured first SubCarrier Spacing (SCS), a first random access preamble message transmitted by a UE when the base station instructs the UE to perform an initial access according to a contention-based random access mechanism; transmitting, by using a predetermined second SCS or a third SCS configured by a network, a first Random Access Response (RAR) message to the UE; receiving, by using a predetermined fourth SCS or a fifth SCS configured by the network, a first scheduling transmission message transmitted by the UE; and transmitting, by using a predetermined sixth SCS or a seventh SCS configured by the network, a first collision resolution message to the UE, to complete the initial access.