Random Access Method Reducing Delay via LBT Caching

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Solution Overview

Problem

The existing random access methods in communication technologies face excessive delay due to the need for repeated Listen Before Talk (LBT) processes, which increase the time required for User Equipment (UE) to access the channel.

Innovation Solution

A method that selects a first resource from multiple radio resources, such as Band Width Parts (BWPs) and carrier resources, for sending a message to a base station, reducing access delay by optimizing resource selection based on thresholds, load, and success/failure rates of LBT, and using indication information in subsequent messages to streamline the random access process.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If LBT is performed before each message in the random access process, then channel access reliability is improved, but random access delay increases

Engineering Contradiction:

Improvechannel access reliabilityVSAvoidrandom access delay

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The patent performs LBT in advance before selecting resources for random access messages. By conducting the Listen Before Talk procedure beforehand and caching the results, the system determines channel availability prior to the actual random access transmission, thereby avoiding repeated LBT operations during the message exchange and reducing overall access delay while maintaining reliability

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent combines multiple random access messages into a single resource selection process. Instead of performing separate LBT operations for each message (Msg1, Msg2, Msg3, Msg4), the system performs one LBT operation and uses the result to select resources for multiple messages simultaneously, merging the channel access operations to reduce total delay

Inventive Principle:

Principle #5Merging (Combining)

2Object-affected harmful factors

If multiple LBT operations are performed in the random access process, then interference avoidance is improved, but access efficiency deteriorates

Engineering Contradiction:

Improveinterference avoidanceVSAvoidaccess efficiency

Core Design Contradiction:

Object-affected harmful factorsVSProductivity

Solution Approach 1:

The system performs LBT operations in advance before the random access process begins, determining channel availability beforehand. This preliminary channel assessment allows the system to select appropriate resources with knowledge of interference conditions, maintaining interference avoidance while eliminating repeated LBT operations that would reduce access efficiency

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent uses the LBT result obtained once to determine resource selection for multiple subsequent messages. The channel availability information is copied and applied across multiple message transmissions (Msg1, Msg2, Msg3, Msg4), avoiding the need to repeat the LBT operation for each message while still ensuring interference avoidance

Inventive Principle:

Principle #26Copying

Data Source

PatentUS11477823B2Random access method, user equipment, base station, storage medium, and electronic device

Publication Date: 2022.10.18 ZTE CORP

AI summary

The present application provides a random access method, a UE, a base station, a storage medium, and an electronic device. The method includes that: in a random access process, a first resource is selected from multiple radio resources, wherein the radio resources include either or a combination of: Band Width Parts (BWPs) and carrier resources; a first message is sent to a base station by using the first resource; and a second message sent by the base station is received, wherein the second message carries indication information of a second resource.