Random Access Signaling Resend for MTC UE Access Quality

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Solution Overview

Problem

There is a lack of effective solutions for improving the quality of access for Machine Type Communication (MTC) User Equipment (UE) in LTE/LTE-A systems, particularly in scenarios where coverage is compromised due to penetration loss, leading to issues with random access signaling.

Innovation Solution

A method and device for resending random access signaling (Msg1) are introduced, where conditions such as failed decoding of RAR Msg2 or Msg4 trigger retransmissions with adjusted power and timing, based on level information and configured limits, to ensure successful access.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If cost reduction measures are adopted for MTC UE (reducing receiving antennae, baseband processing bandwidth, peak rate), then device cost is reduced, but coverage performance and access quality deteriorate

Engineering Contradiction:

Improvedevice costVSAvoidcoverage performance

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The patent implements dynamic adjustment of random access signaling parameters including transmission power, timing, and frequency resources based on detected channel conditions and coverage requirements. The system dynamically selects between different random access procedures and adjusts transmission parameters in real-time to maintain access quality despite reduced UE capabilities

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent changes multiple parameters of the random access signaling including power levels, timing advance values, frequency offsets, and resource allocation to optimize access performance. These parameter adjustments compensate for the reduced capabilities of low-cost MTC UEs and improve coverage in challenging environments

Inventive Principle:

Principle #35Parameter changes

2Reliability

If random access signaling is resent with increased power and adjusted timing, then access reliability is improved, but transmission power consumption increases

Engineering Contradiction:

Improveaccess reliabilityVSAvoidtransmission power consumption

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The patent employs feedback mechanisms where the UE monitors for random access responses and contention resolution messages, and the network provides acknowledgments and timing advance commands. This feedback loop enables the system to determine when retransmission is necessary, avoiding unnecessary power consumption while ensuring reliable access

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The patent implements periodic random access signaling with structured retransmission intervals and timing. Instead of continuous transmission, the system uses periodic attempts with specific backoff intervals, balancing reliability requirements with power consumption constraints for battery-operated MTC devices

Inventive Principle:

Principle #19Periodic action

Data Source

PatentUS10455448B2Random access signalling resending method and apparatus

Publication Date: 2019.10.22 ZTE CORP

AI summary

Provided are a random access signalling resending method and apparatus. In the method, in the case where a first condition is satisfied, a second-type node is adopted to resend random access signalling Msg1, thereby solving the problem that the access quality of a user terminal accessing an LTE/LTE-A system is not high and improving the access quality of the user terminal accessing the LTE/LTE-A system.