Network-Controlled D2D Discovery Signal Generation and Reception
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Solution Overview
Problem
Existing wireless technologies for device-to-device (D2D) communication, such as Wi-Fi and Bluetooth, operate on license-exempt bands and are prone to interference, leading to lower Quality of Service, while LTE and LTE-A technologies require network-controlled D2D communication for improved reliability and efficiency.
Innovation Solution
Implementing methods and devices for D2D 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
Engineering Contradiction Analysis
1Ease of operation
If Wi-Fi and Bluetooth are used for D2D communication, then direct communication between devices is enabled, but interference increases and Quality of Service decreases
Solution Approach 1:
The network acts as an intermediary to control and coordinate D2D communication resources. The network provides discovery signal schedules, allocates time-frequency resources, and manages interference coordination, enabling direct device communication while maintaining network oversight to ensure Quality of Service and reduce interference.
2Reliability
If LTE and LTE-A network control is implemented for D2D communication, then reliability and efficiency improve, but device scanning time and power consumption increase
Solution Approach 1:
The network pre-configures discovery signal schedules and resource allocations before D2D communication occurs. Devices receive advance information about when and where to transmit and receive discovery signals, eliminating the need for extensive scanning and reducing device power consumption while maintaining reliable network-controlled communication.
3Object-affected harmful factors
If LTE and LTE-A network control is implemented for D2D communication, then interference management improves, but device complexity increases
Solution Approach 1:
The patent extracts the complex interference management and resource coordination functions from the devices and places them in the network. The network handles discovery signal scheduling, resource allocation, and interference coordination, while devices simply follow the provided schedules to transmit and receive signals, significantly reducing device complexity.
Data Source
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.