D2D Communication Scheduling via Cellular Subframe Synchronization
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Solution Overview
Problem
The increasing demand for wireless services strains limited radio network resources, and existing D2D communication systems face challenges in efficiently managing resources and minimizing interference with cellular networks.
Innovation Solution
Implementing a network-assisted D2D communication system that synchronizes with cellular networks using a 3GPP LTE frame structure, allowing UEs to switch between transmission and reception modes at symbol boundaries, and allocating resources in synchronization with cellular subframe units to reduce interference and optimize resource use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If D2D communication is implemented to reduce load on radio network resources, then resource utilization efficiency is improved, but interference with cellular communications increases
Solution Approach 1:
The patent implements periodic action by synchronizing D2D communications with cellular network subframe structures, where UEs transmit and receive data in periodic time intervals aligned with cellular subframes. This periodic scheduling ensures that D2D transmissions occur only during designated time resources, reducing random interference with cellular communications while maintaining efficient resource utilization.
Solution Approach 2:
The patent applies segmentation by dividing available time resources into distinct subframes, with specific subframes allocated for cellular communications and others for D2D communications. This temporal segmentation allows the system to separate cellular and D2D transmissions in time, reducing mutual interference while maximizing overall resource utilization efficiency.
2Object-affected harmful factors
If D2D communications are synchronized with cellular network, then interference is reduced, but system complexity increases
Solution Approach 1:
The patent implements universality by enabling UE transceivers to perform multiple functions - serving both cellular communications and D2D communications using the same hardware resources. The UE can switch between cellular mode and D2D mode based on scheduling decisions, eliminating the need for separate dedicated hardware for each communication type and thereby reducing system complexity while maintaining interference reduction benefits.
Solution Approach 2:
The patent uses the cellular network's eNodeB as an intermediary to coordinate and manage D2D communications. The eNodeB provides synchronization signals, allocates time-frequency resources, and manages switching between cellular and D2D modes. This centralized control simplifies the complexity by providing a single point of coordination rather than requiring distributed synchronization among all D2D participants.
3Productivity
If UEs switch between transmission and reception modes at symbol boundaries, then resource allocation efficiency is improved, but switching overhead increases
Solution Approach 1:
The patent applies preliminary action by pre-configuring UE transmission and reception schedules based on anticipated communication patterns. The eNodeB provides advance scheduling information indicating when UEs should switch between transmission and reception modes, allowing UEs to prepare for mode transitions in advance and minimize actual switching overhead during data transmission.
Solution Approach 2:
The patent implements periodic action by establishing regular switching patterns between transmission and reception modes that align with the periodic structure of cellular subframes and D2D time resources. This periodic switching schedule, predetermined and synchronized with the network, reduces switching overhead by creating predictable, rhythmic transitions rather than ad-hoc switching decisions.
Data Source
AI summary
A technology for device to device (D2D) communication scheduling is disclosed. A D2D device can be synchronized with a base station of a cellular system. A sub-frame symbol boundary can be identified in the cellular system for the D2D communication. A resource for a D2D communication can be allocated from the D2D device to another D2D device within the sub-frame boundary of the cellular system. The D2D device can be switched to perform a D2D communication with another D2D device in proximity with the D2D device, wherein the other D2D device is substantially synchronized with the base station of the cellular system. The D2D device can communicate with the other D2D device within at least one symbol boundary time within the selected subframe.