Distributed Scheduling for D2D Communication Interference Management
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Solution Overview
Problem
Enabling Device-to-Device (D2D) communications in cellular networks poses resource allocation challenges, particularly due to increased interference and the need for autonomous management of communication radio resources by devices, as existing resource allocation methods are not suitable for D2D operations, especially when cellular networks are unavailable.
Innovation Solution
A wireless transmit/receive unit (WTRU) determines and selects scheduling assignment (SA) resources based on conditions such as data readiness, received signals, and data characteristics, using pre-configured or dynamically determined sets of allowed resources to minimize interference and optimize D2D data transmission, even in the absence of network coverage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If D2D communications are enabled to allow direct device communication, then spectrum efficiency is improved and network autonomy is enhanced, but resource allocation challenges and interference increase
Solution Approach 1:
The patent enables devices to autonomously manage their own communication resources through self-scheduling mechanisms. Each WTRU independently determines its transmission parameters, selects resources from available pools, and manages its buffer status without requiring centralized network control, thereby achieving self-service resource allocation that improves spectrum efficiency while managing interference
Solution Approach 2:
The patent implements dynamic parameter adjustment for D2D communications, including adaptive modulation and coding schemes, variable transmission power levels, and flexible resource block allocation. These parameter changes allow the system to optimize performance and manage interference adaptively based on channel conditions and network status
2Ease of manufacture
If existing resource allocation methods are used for D2D communications, then implementation simplicity is maintained, but resource allocation suitability deteriorates
Solution Approach 1:
The patent creates a universal resource allocation framework that can operate in multiple modes: network-controlled mode when eNB coverage is available and autonomous self-scheduling mode when network coverage is unavailable. This multi-functionality allows the same system to adapt to different deployment scenarios, maintaining ease of implementation while achieving suitable resource allocation for D2D-specific requirements
3Ease of operation
If centralized network control is used for resource allocation, then resource management simplicity is maintained, but network availability requirement increases
Solution Approach 1:
The patent segments the resource allocation control function into two independent parts: centralized network control for initial configuration and parameter setting, and distributed device-level autonomous decision-making for actual resource selection and transmission management. This segmentation allows the system to operate with simple centralized configuration while achieving high reliability through autonomous device operation that does not require continuous network availability
4Extent of automation
If D2D communications operate autonomously without network coverage, then network dependency is reduced, but device complexity increases
Solution Approach 1:
The patent implements preliminary action by having the network provide initial configuration parameters, resource pool definitions, and operational guidelines before D2D communication begins. Devices receive and store these pre-configured parameters, which guide their autonomous operation. This preliminary setup reduces the complexity of autonomous decision-making during actual D2D communication, as devices follow pre-established rules rather than making complex real-time decisions
Data Source
AI summary
Systems, methods, and instrumentalities are provided to implement scheduling for device-to-device (D2D). A WTRU (e.g., a D2D WTRU) may determine whether the WTRU has D2D data to transmit. The WTRU may determine a set of allowed SA resources and/or allowed D2D data resources for transmission of the SA. The WTRU may select an SA resource and/or D2D data resources (e.g., from the set of allowed SA resources and/or D2D data resources) for transmission. The WTRU may select one or more transmission parameters. The WTRU may select one or more transmission patterns. The WTRU may transmit D2D data over the set of allowed D2D resources using the selected transmission patterns and according to the selected transmission parameters.