Ordered PRACH Resource Management for Narrowband MTC Access

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Existing wireless communication systems face challenges in efficiently managing transmission resources for low-cost machine type communication (MTC) devices with limited capabilities, particularly in enhancing coverage and handling collisions between paging and random access response messages.

Innovation Solution

The proposed solution involves bundling paging and random access response (RAR) messages for MTC devices, allowing for coverage enhancements up to 15 dB, and optimizing resource management by determining and adapting bundling sizes based on network triggers, while supporting MTC devices in various wireless networks including LTE, CDMA, TDMA, FDMA, and OFDMA.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If paging and RAR messages are transmitted separately to MTC devices, then resource utilization is efficient, but coverage is limited and message collisions cannot be handled effectively

Engineering Contradiction:

Improvemessage delivery reliabilityVSAvoidcoverage area

Core Design Contradiction:

ReliabilityVSArea of stationary object

Solution Approach 1:

The patent combines paging messages and random access response (RAR) messages into a single bundled transmission. The base station bundles these messages together in a single downlink transmission, allowing MTC devices to receive both message types simultaneously, thereby improving coverage by up to 15 dB and handling message collisions effectively while maintaining resource efficiency

Inventive Principle:

Principle #5Merging (Combining)

2Productivity

If transmission resources are allocated dynamically for each MTC device, then resource utilization is optimized, but device complexity and power consumption increase

Engineering Contradiction:

Improveresource utilization efficiencyVSAvoidMTC device complexity

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The patent enables MTC devices to autonomously determine whether they are paged or need to send a random access preamble by monitoring bundled paging and RAR messages. The device self-identifies its state and takes appropriate action without requiring complex dynamic resource allocation mechanisms, thereby reducing device complexity and power consumption while maintaining efficient resource utilization

Inventive Principle:

Principle #25Self-service

3Reliability

If coverage enhancement is increased for MTC devices, then reliability improves, but resource consumption increases

Engineering Contradiction:

Improvecommunication reliabilityVSAvoidtransmission energy consumption

Core Design Contradiction:

ReliabilityVSLoss of energy

Solution Approach 1:

By bundling paging and RAR messages into a single transmission, the patent achieves coverage enhancement of up to 15 dB without requiring multiple separate transmissions. This consolidated approach improves reliability for low-cost MTC devices while avoiding the energy waste that would result from transmitting separate messages multiple times

Inventive Principle:

Principle #5Merging (Combining)

Data Source

PatentEP4152877B1Ordered physical random access channel resource management

Publication Date: 2025.09.10 QUALCOMM INC

Figure 1
Figure 2
Figure 3

AI summary

A method for wireless communications performed by a user equipment, UE , is described. The UE comprises receiving a command from a base station, BS (110), to transmit a physical random access channel, PRACH, signal to the BS (110); obtaining an indication of a PRACH region comprising a set of transmission resources, within a narrowband region of a wider system bandwidth, for transmitting PRACH signals to the BS (110); and transmitting a PRACH signal to the BS (110) using the transmission resources in the PRACH region. Further, a corresponding apparatus and computer program are described.