Side-link Reference Signal Received Power Measurement for D2D

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Solution Overview

Problem

Cellular networks face congestion and throughput limitations due to high data demands from mobile devices, particularly when a large number of devices in close proximity communicate, leading to network overload.

Innovation Solution

Implementing device-to-device (D2D) communication using side-link channels, where User Equipment (UE) determines a resource element block size based on channel delay spread to calculate side-link reference signal received power (S-RSRP), enabling efficient resource allocation and communication.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Quantity of substance

If mobile devices communicate through the network infrastructure, then data exchange is enabled, but network congestion and overload occur when many devices are in close proximity

Engineering Contradiction:

Improvenetwork capacityVSAvoiddata throughput

Core Design Contradiction:

Quantity of substanceVSProductivity

Solution Approach 1:

The patent segments the communication path by introducing direct device-to-device (D2D) communication as a separate channel alongside traditional network communication. This allows traffic to be divided between network-routed data and direct peer-to-peer data exchanges, reducing network load while maintaining communication capabilities.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent introduces a side-link channel as an intermediary communication path between devices. This side-link enables direct communication without requiring network infrastructure mediation, effectively bypassing network congestion while still operating within the overall communication system framework.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Productivity

If device-to-device communication is implemented using side-link channels, then direct UE-to-UE communication is enabled and network burden is reduced, but measurement precision of signal power is required for efficient resource allocation

Engineering Contradiction:

Improvedata throughputVSAvoidsignal power measurement

Core Design Contradiction:

ProductivityVSMeasurement precision

Solution Approach 1:

The patent changes the measurement parameter from traditional RSRP (Reference Signal Received Power) to S-RSRP (Side-link RSRP), specifically adapted for side-link D2D communication. This parameter change enables accurate measurement of signal power in the direct communication channel, accounting for the unique characteristics of side-link transmissions including delay spread effects.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent replaces traditional network-mediated communication mechanics with direct device-to-device communication mechanics. This substitution requires new measurement and resource allocation mechanisms that operate independently of network infrastructure, enabling autonomous D2D resource management.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Data Source

PatentUS9974039B2User equipment and method for measurement of side-link reference signal received power (S-RSRP)

Publication Date: 2018.05.15 APPLE INC

AI summary

Embodiments of a User Equipment (UE) and methods for determination of a side-link reference signal received power (S-RSRP) are disclosed herein. The UE may receive a signal from a second UE as part of a device-to-device (D2D) communication. The UE may determine a resource element (RE) block size to be used for a determination of the S-RSRP. The RE block size may be based on a delay spread of a channel between the UE and the second UE. The UE may determine the S-RSRP based on multiple summations, sizes of which may be based on the determined RE block size.