Half-Duplex Relay Interference Alignment for 5G
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The processing complexity and overload issues in mobile devices when applying interference alignment schemes in cellular environments, particularly due to the need for channel information and beamforming requirements in 5G communication systems, hinder real-time communication efficiency.
Innovation Solution
The implementation of a half-duplex relay station in wireless communication systems, which receives and processes signals from both within and outside its cell, allowing for interference alignment by separating interference signals through beamforming without requiring extensive channel information feedback from mobile terminals, thereby reducing processing burdens.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If interference alignment scheme is applied in cellular environment, then interference mitigation is improved, but processing complexity and device overload increase
Solution Approach 1:
The patent introduces a relay station as an intermediary between transmission nodes and reception nodes. The relay station performs channel estimation, beamforming calculation, and signal processing functions that would otherwise burden mobile devices. By acting as a mediator, the relay station enables interference alignment while offloading complex processing from resource-constrained mobile terminals, thus resolving the contradiction between interference mitigation and device complexity
Solution Approach 2:
The patent extracts the complex channel information processing and beamforming computation tasks from mobile devices and relocates them to the relay station. The mobile device only needs to receive and transmit raw signals, while the relay station handles the computationally intensive tasks of estimating channels from multiple transmission nodes, calculating beamforming weights, and performing interference alignment. This extraction of processing functions resolves the contradiction by maintaining interference mitigation capabilities while reducing device complexity
2Reliability
If channel information feedback is required for interference alignment, then beamforming performance is improved, but data processing load on mobile devices increases
Solution Approach 1:
The patent inverts the traditional feedback architecture by having the relay station perform channel estimation based on reference signals from transmission nodes, rather than requiring mobile devices to estimate and feedback channel information. The relay station calculates beamforming weights using the estimated channel state information and sends processed signals to reception nodes. This inversion shifts the processing burden from mobile devices to the relay station, maintaining beamforming performance while reducing data processing load on mobile terminals
Data Source
AI summary
The present disclosure relates to a pre-5th-Generation (5G) or 5G communication system to be provided for supporting higher data rates Beyond 4th-Generation (4G) communication system such as Long Term Evolution (LTE). An operation method of a reception node in a wireless communication system includes: receiving first signals including a signal received through a first channel, which is a channel between at least one transmission node belonging to a cell of the reception node and the reception node, and a signal received through a second channel, which is a channel between at least one transmission node belonging to a neighbor cell and the reception node during a first time interval; receiving a second signal, to which beamforming for removing a signal from at least one transmission node belonging to the neighbor cell is applied, from a relay station through a channel between the relay station and the reception node; and decoding a third signal acquired by adding the first signal and the second signal.