D2D Frequency Off Field Signaling for Interference Control
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Solution Overview
Problem
Device-to-Device (D2D) communications in cellular networks can interfere with other network operations when mobile devices are out of coverage, leading to potential interference with uplink and downlink transmissions, as they may not have properly coordinated resource allocations, causing disruptions and reducing network efficiency.
Innovation Solution
Implementing a D2D Frequency Off (DFO) field within the Physical D2D Synchronization Channel (PD2DSCH) data structure to indicate whether D2D operations are prohibited, allowing mobile devices to suppress interference by adapting their configurations based on coverage status and resource allocation, thereby preventing unauthorized D2D operations that could interfere with other network operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If D2D communications are allowed for out-of-coverage devices, then device autonomy and communication flexibility are improved, but interference with uplink and downlink transmissions increases
Solution Approach 1:
The base station performs preliminary action by transmitting the DFO field in advance through the PD2DSCH before D2D communications occur. This preliminary signaling allows out-of-coverage devices to receive prohibition instructions beforehand, enabling them to suppress interfering transmissions proactively rather than reactively, thus preventing interference while maintaining device autonomy.
Solution Approach 2:
The DFO field acts as an intermediary mechanism between the base station and out-of-coverage devices. Instead of direct network control, the base station uses the DFO field as an intermediate signaling element to convey prohibition information, which then mediates the behavior of D2D devices by enabling them to autonomously determine when to suppress transmissions based on the received field values.
2Productivity
If D2D operations are prohibited for out-of-coverage devices, then network operation efficiency is improved, but device flexibility and autonomous communication are reduced
Solution Approach 1:
The system introduces dynamics by making the DFO field configurable and changeable based on network conditions. Rather than a static prohibition, the field can be dynamically adjusted by the base station depending on interference levels, coverage status, and network requirements. This allows the system to adapt between strict prohibition and flexible operation modes, balancing network efficiency with device flexibility.
Solution Approach 2:
The invention changes the parameter of D2D operation status from a fixed state to a dynamically controllable one through the DFO field. By modifying this parameter based on real-time network conditions and device status, the system can optimize network efficiency while preserving device flexibility when appropriate, resolving the contradiction between productivity and adaptability.
3Adaptability or versatility
If resource allocation is not coordinated between D2D and network operations, then device autonomy is improved, but network throughput and efficiency deteriorate
Solution Approach 1:
The base station implements feedback by monitoring network conditions and D2D operation status, then using this information to adjust the DFO field transmissions. This feedback loop allows the system to detect when D2D operations are causing throughput degradation and respond by prohibiting them, thereby maintaining network efficiency while preserving device autonomy when resource coordination is not an issue.
Data Source
AI summary
An embodiment method for operating a base station includes instructing, by the base station, a mobile device to transmit, over grouped communications resources, a first instance of a data structure for D2D signaling. The data structure includes a first data field that indicates at least one of a D2D frame number, a D2D multiplexing configuration, a resource allocation for D2D signaling, an identifier of a D2D synchronization source, a type of a D2D synchronization source, or whether the mobile device is in coverage of a network. The data structure also includes a second data field indicating at least one of whether a D2D signaling operation is prohibited, or a type of prohibited D2D signaling operation.