RACH Resource Segmentation for Beam Correspondence

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Solution Overview

Problem

The increasing number of user equipment (UEs) and data transmission requirements in wireless communication systems pose challenges in efficiently using limited radio resources, particularly in reducing latency and supporting new radio access technologies, while also addressing the need for improved communication capacity and reliability.

Innovation Solution

The method involves configuring separate random access channel (RACH) resources for different preamble formats based on transmission and reception beam correspondence between user equipment (UE) and base station (BS), allowing the UE to transmit physical RACH signals using the appropriate resource depending on beam correspondence, thereby optimizing resource utilization and reducing latency.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Loss of time

If separate RACH resources are configured for different preamble formats based on beam correspondence, then random access efficiency and latency are improved, but system complexity increases

Engineering Contradiction:

Improverandom access latencyVSAvoidsystem complexity

Core Design Contradiction:

Loss of timeVSDevice complexity

Solution Approach 1:

The RACH resources are segmented into different types (first RACH resource for preambles with beam correspondence, second RACH resource for preambles without beam correspondence). This segmentation allows the system to handle different beam correspondence scenarios separately, reducing access latency for each case while maintaining manageable system complexity through structured resource allocation.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The system dynamically selects between first and second RACH resources based on beam correspondence conditions. The base station and UE adaptively choose the appropriate RACH resource type according to the current beam correspondence status, enabling flexible response to changing channel conditions while maintaining systematic resource management.

Inventive Principle:

Principle #15Dynamics

2Adaptability or versatility

If multiple RACH resources are configured for different scenarios, then adaptability to various communication conditions is improved, but resource management complexity increases

Engineering Contradiction:

Improveadaptability to beam correspondence conditionsVSAvoidresource management complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

Different RACH resources are allocated with specific qualities suited to their intended use cases. The first RACH resource is optimized for scenarios with beam correspondence, while the second RACH resource is optimized for scenarios without beam correspondence. This local quality differentiation improves adaptability while keeping resource management systematic through clear resource-type classification.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The RACH resource configuration system serves multiple functions: it supports both beam correspondence and non-beam correspondence scenarios, handles different preamble formats, and provides a unified framework for random access. This multi-functionality approach improves versatility while maintaining manageable complexity through a comprehensive yet structured resource management system.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Data Source

PatentUS10873929B2Method and user equipment for transmitting random access signals, and method and base station for receiving random access signals

Publication Date: 2020.12.22 LG ELECTRONICS INC

AI summary

Disclosed herein are a method and apparatus for transmitting/receiving random access signals. A first random access channel (RACH) resource for a first RACH preamble format and a second RACH resource for a second RACH preamble format are configured, separately. The first RACH resource and the second RACH resource are for a UE at which Tx/Rx beam correspondence holds and for a UE at which Tx/Rx beam correspondence does not hold, respectively. A UE can use the first or second RACH resource, depending on whether or not Tx/Rx beam correspondence holds at the UE.