D2D Discovery Signal Scheduling for Low-Interference QoS

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Solution Overview

Problem

Existing wireless technologies for device-to-device communication, such as Wi-Fi and Bluetooth, face interference issues and lower Quality of Service, particularly in license-exempt bands, and there is a need for network-controlled D2D communication solutions.

Innovation Solution

Implementing methods and devices for device-to-device signaling that include determining a discovery signal schedule, selecting a scrambling sequence, and transmitting a D2D discovery signal with a payload and reference symbol, under network control.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If Wi-Fi and Bluetooth are used for device-to-device communication, then direct communication between devices is enabled, but interference increases and Quality of Service decreases

Engineering Contradiction:

Improvedirect communication capabilityVSAvoidQuality of Service

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The patent introduces a cellular network as an intermediary to control and coordinate D2D communications. The network manages resource allocation, scheduling, and interference coordination between devices, transforming the uncontrolled direct communication into a network-assisted mode that maintains reliability while enabling direct device interaction

Inventive Principle:

Principle #24Intermediary (Mediator)

2Adaptability or versatility

If license-exempt bands are used for D2D communication, then direct communication is enabled, but interference increases

Engineering Contradiction:

Improvecommunication flexibilityVSAvoidinterference

Core Design Contradiction:

Adaptability or versatilityVSObject-affected harmful factors

Solution Approach 1:

The patent changes the frequency parameter by utilizing licensed cellular bands instead of license-exempt bands for D2D communication. This parameter change reduces interference while maintaining communication flexibility through network-controlled resource allocation and scheduling mechanisms

Inventive Principle:

Principle #35Parameter changes

3Reliability

If network control is implemented for D2D communication, then Quality of Service improves, but system complexity increases

Engineering Contradiction:

ImproveQuality of ServiceVSAvoidnetwork control overhead

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent makes the cellular network perform multiple functions simultaneously: traditional cellular communication, D2D discovery, D2D communication coordination, and resource management. By consolidating these functions into existing network infrastructure, the patent avoids adding significant complexity while improving QoS through unified control

Inventive Principle:

Principle #6Universality (Multi-functionality)

Data Source

PatentUS20250365568A1Discovery Signal Generation and Reception

Publication Date: 2025.11.27 INTERDIGITAL PATENT HOLDINGS INC

AI summary

Physical layer processing and procedures for device-to-device (D2D) discovery signal generation and transmission and scheduling of D2D discovery signals are described. Detection and measurement of a D2D discovery signal, D2D signal identity management, and monitoring by a wireless transmit/receive unit (WTRU) of PDCCH for D2D discovery scheduling is described, as is a WTRU that may be configured with a D2D-specific transmission/reception opportunity pattern. The discovery signal may carry a payload for explicit information about user and/or service identity, and may be mapped to physical resources in such a way as to decouple transmission/reception of the discovery signal from downlink operations. A WTRU may measure a D2D discovery signal quality and report to the network.