D2D Pre-coding MIMO Interference Management
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Solution Overview
Problem
In cellular communication systems, device-to-device (D2D) communications often face interference issues due to the proximity of wireless communication devices, which existing technologies struggle to manage effectively, leading to potential interference with unintended recipient devices.
Innovation Solution
The implementation of pre-coding Multiple Input Multiple Output (MIMO) parameters, determined based on channel characteristics, is used to manage interference by adjusting the amplitude and phase components of D2D signals transmitted between D2D mobile devices, utilizing cellular communication resources to minimize interference through techniques like interference rejection, shaping, and avoidance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If D2D communication is implemented between proximate devices, then direct communication efficiency is improved, but interference to unintended recipient devices increases
Solution Approach 1:
The patent applies local quality by transmitting different pre-coded signals to different receiving devices through the same physical medium. Each receiving device receives a signal that is locally optimized for its specific channel characteristics, allowing the transmitting device to maintain high communication efficiency while minimizing interference to specific unintended recipients through device-specific pre-coding
Solution Approach 2:
The patent changes signal parameters by applying pre-coding transformations to the transmitted signal. The transmitting device modifies signal characteristics (amplitude, phase, spatial distribution) based on channel state information, enabling the same physical transmission to have different effective characteristics for different receiving devices, thus achieving both efficient communication and interference reduction
2Object-affected harmful factors
If pre-coding MIMO parameters are used to minimize interference, then interference management is improved, but system complexity increases
Solution Approach 1:
The patent introduces channel state information as an intermediary that mediates between the transmitting and receiving devices. This intermediary contains pre-determined characteristics about the communication channel that enable the transmitting device to apply appropriate pre-coding without real-time complex calculations, reducing system complexity while maintaining effective interference management
Solution Approach 2:
The patent applies preliminary action by pre-determining channel state information and pre-coding parameters before actual data transmission. The transmitting device prepares signal characteristics in advance based on predicted or measured channel conditions, allowing interference management to be implemented without adding real-time processing complexity to the communication system
Data Source
AI summary
In a cellular communication system, pre-coding MIMO parameters are assigned for transmission of device-to-device (D2D) signals between D2D mobile devices to minimize interference at unintended recipient devices (receiving proximate devices). The pre-coding MIMO parameters are transmitted from a base station to a transmitting D2D mobile device over a subset of defined downlink cellular communication resources defined by a communication specification for downlink transmission from base stations to mobile wireless devices. The pre-coding MIMO parameters are determined based on channel characteristics of at least an Interference channel where the Interference channel is between a D2D transmitting device and a proximate receiving mobile device (unintended recipient device). The pre-coding MIMO parameters are determined to facilitate interference management at the receiving proximate mobile device when the pre-coded transmission signal is received through the interference channel.