RACH Resource Segmentation for CE Level Selection

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Solution Overview

Problem

Existing Early Data Transmission (EDT) protocols in networks like NB-IoT and eMTC face inefficiencies in data transmission during the random access response phase, particularly in handling multiple Coverage Enhancement (CE) levels and RACH resource management.

Innovation Solution

The proposed method involves a user equipment (UE) receiving a paging message from a base station that includes a Random Access Channel (RACH) resource associated with Coverage Enhancement (CE) level information, allowing the UE to select a specific CE level and transmit a Random Access preamble accordingly.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If multiple RACH resources are provided for different CE levels, then the adaptability of the system to different coverage conditions is improved, but the device complexity and resource management overhead increase

Engineering Contradiction:

Improveadaptability to different coverage conditionsVSAvoidRACH resource management complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The RACH resources are segmented into multiple distinct resources, each associated with a specific CE level. This segmentation allows the system to provide adaptability to different coverage conditions while managing complexity through structured organization of resources and their corresponding CE levels.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different RACH resources are configured with local quality characteristics suited for specific CE levels. Each resource has properties optimized for its associated coverage enhancement level, allowing targeted adaptation without requiring all resources to handle all conditions.

Inventive Principle:

Principle #3Local quality

2Measurement precision

If the UE selects a specific CE level from multiple options, then the precision of matching transmission parameters to channel conditions is improved, but the time and processing overhead for selection increase

Engineering Contradiction:

Improveprecision of CE level matchingVSAvoidtime for CE level selection

Core Design Contradiction:

Measurement precisionVSLoss of time

Solution Approach 1:

The base station performs preliminary action by configuring multiple RACH resources with their associated CE level information before the UE needs to make a selection. This pre-configuration allows the UE to efficiently match its current channel conditions to the appropriate pre-defined resource without extensive real-time processing.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The UE autonomously selects the appropriate CE level based on its own measurement of channel conditions and the provided RACH resource information. This self-service approach enables precise matching without requiring complex centralized control or extensive signaling overhead.

Inventive Principle:

Principle #25Self-service

Data Source

PatentUS12324020B2Method and apparatus for data transmission

Publication Date: 2025.06.03 LENOVO (BEIJING) LTD

AI summary

The present application relates to a user equipment, a base station and a method for data transmission. The base station transmits a paging message to the user equipment. The paging message includes a Random Access Channel (RACH) resource associated with Coverage Enhancement (CE) level information. After receiving the paging message, the user equipment selects a specific CE level from the CE level information. The user equipment transmits a Random Access (RA) preamble to the base station according to the RACH resource with the specific CE level.