D2D Communication via Cooperating Base Stations
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Solution Overview
Problem
The increasing demand for wireless communication due to numerous smart and sensor devices has led to congestion in available frequency resources, with existing methods like MU-MIMO and high-order modulation reaching theoretical limits, and new band frequency resources facing issues such as short transmission distances due to severe path loss.
Innovation Solution
A communication method for device-to-device (D2D) in a multi-hop network using multiple heterogeneous cells, where a network topology is configured with cooperating base stations to manage interference and allocate wireless resources efficiently, enabling simultaneous communication using identical frequencies over longer distances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If new band frequency resources (tens of GHz) are used to increase bandwidth, then frequency resources are expanded, but transmission distance becomes short due to severe path loss
Solution Approach 1:
The patent introduces base stations as intermediary nodes between transmitting and receiving devices. The base station receives signals from transmitting devices, processes them (including interference cancellation), and forwards to receiving devices. This mediator approach allows high-frequency signals to achieve long transmission distances by avoiding direct long-range transmission, thus resolving the contradiction between using new band frequency resources and maintaining transmission distance.
2Productivity
If frequency resources are allocated to handle increasing communication traffic, then communication capacity is improved, but frequency congestion increases
Solution Approach 1:
The patent merges multiple functions into the base station including interference cancellation, signal processing, and relay communication. By combining these functions, the system can handle increasing communication traffic more efficiently without requiring proportionally more frequency resources, thus improving communication capacity while reducing frequency congestion.
Solution Approach 2:
The base station serves multiple purposes: it acts as a relay for device-to-device communication, performs interference cancellation for multiple device pairs, and manages network coordination. This multi-functionality allows the system to handle increased traffic without requiring additional dedicated frequency resources for each function, thereby improving productivity while minimizing frequency congestion.
3Productivity
If MU-MIMO and high-order modulation are used to enhance frequency efficiency, then frequency band utilization is improved, but theoretical limits are reached
Solution Approach 1:
The patent changes the fundamental parameter of communication architecture from direct device-to-device high-frequency transmission to base-station-mediated transmission with interference cancellation. This parameter change allows the system to exceed the theoretical limits of conventional MU-MIMO and high-order modulation by using a different technical approach (interference cancellation at the base station) rather than pushing existing methods to their limits.
4Length of moving object
If base stations process data for D2D communication, then transmission distance and rate are improved, but system complexity increases
Solution Approach 1:
The base station automatically performs interference cancellation and signal processing without requiring complex coordination protocols between devices. The transmitting devices simply send signals to the base station, which self-services by processing the signals and managing interference, thus improving communication distance and rate while keeping device complexity low.
Data Source
AI summary
Provided are a communication method and apparatus for device-to-device (D2D). More particularly, the communication method for D2D includes configuring a network topology using at least one cooperating base station to communicate among devices included in multiple heterogeneous cells, creating an association between multiple device pairs and at least one base station based on configuring the network topology, and determining a cooperation context for communication among the multiple device pairs is provided. The communication apparatus carries out such a method.