Cooperative IoT Paging Relay for Long-DRX Latency Reduction

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Solution Overview

Problem

In IoT communication systems, the latency and power consumption associated with paging and data transmission are high due to long Discontinuous Reception (DRX) cycles, especially for devices with limited battery capacity, leading to inefficient use of network resources and low data resolution.

Innovation Solution

Implementing a method where closely located communication devices utilize both short-range and long-range wireless connections, coordinating paging and data transmission within groups to optimize power usage and resource efficiency, allowing more frequent communication while reducing individual device signaling.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Use of energy by moving object

If long DRX cycles are utilized to save power and network resources, then power consumption and network resource usage are reduced, but paging latency and data transmission latency increase significantly

Engineering Contradiction:

Improvepower consumptionVSAvoidpaging latency

Core Design Contradiction:

Use of energy by moving objectVSLoss of time

Solution Approach 1:

The system segments communication devices into groups that can cooperate with each other. When one device receives a page, it can forward the paging information to other group members via short-range communication, effectively reducing the paging latency for all devices in the group while maintaining long DRX cycles for power saving.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Devices in the group act as intermediaries for each other. A device that receives a page can serve as a mediator to forward paging information to other devices that are in sleep mode, enabling indirect paging delivery without requiring the target device to be awake and directly receive the page.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Use of energy by moving object

If long DRX cycles are used to reduce power consumption, then battery life is extended, but the resolution in time of data collected from UEs is low

Engineering Contradiction:

Improvebattery lifeVSAvoiddata resolution in time

Core Design Contradiction:

Use of energy by moving objectVSMeasurement precision

Solution Approach 1:

By segmenting devices into groups with short-range interconnections, the system enables more frequent data exchanges within groups without requiring each device to individually wake up for long-range communication. This maintains high temporal resolution for data collection while preserving battery life through cooperative communication.

Inventive Principle:

Principle #1Segmentation

3Reliability

If individual devices transmit data directly to the host via long-range connection, then data transmission is reliable, but power consumption and network resource usage increase

Engineering Contradiction:

Improvedata transmission reliabilityVSAvoidpower consumption

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The system merges the communication capabilities of multiple devices in a group. Instead of each device individually establishing long-range connections to the host, devices can combine their resources and cooperate to share data with the host, reducing the total number of long-range connections and associated power consumption while maintaining transmission reliability.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

Devices in the group serve multiple functions: they act as both end devices and relay nodes. A device can transmit its own data to the host directly, or forward data from other group members, or receive pages for other members. This multi-functionality reduces overall power consumption by eliminating redundant long-range connections.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Data Source

PatentUS12484018B2Communication device, host and methods therein for handling paging and data exchanging in wireless communication system

Publication Date: 2025.11.25 TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)

AI summary

A communication device and method therein for handling paging from a network node and data exchanging with a host. The communication device is one of a group of closely located communication devices capable of communicating with each other via a short-range wireless connection or a wired connection and is capable of communicating with the host over a long-range wireless connection via the network node. The communication device receives a page from the network node at a predefined occasion and evaluates if the page is targeted for itself or is targeted for one of the other devices in the group. When the page is targeted for itself, the communication device performs a paging response. When the page is targeted for one of the other devices in the group of closely located communication devices, the communication device forwards paging information to the targeted communication device.