D2D Link Scheduling for MIMO Signal Interference Management
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Solution Overview
Problem
Current link scheduling techniques for Device to Device (D2D) communication are not suitable for Multi Input Multi Output (MIMO) wireless communication systems, particularly in next-generation mobile communication systems, as they fail to effectively manage signal interference and resource reuse in multi-antenna environments.
Innovation Solution
A method and apparatus for link scheduling that groups D2D links based on priority, determines signal interference, and selects communication modes such as single user MIMO, Zero Forcing, or Interference Alignment beamforming depending on the presence of signal interference, using equations to optimize antenna configurations and resource block allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If link scheduling technique is used for single-antenna wireless communication device, then inter-link interference can be avoided, but it cannot be applied to multi-antenna MIMO wireless communication devices
Solution Approach 1:
The patent extends link scheduling from single-antenna to multi-antenna systems by changing the parameters considered in scheduling decisions. It introduces antenna-specific parameters including the number of transmit antennas (M[i]), number of receive antennas (N[i]), and number of data streams (d[i]) for each link. The grouping criterion equation incorporates these parameters to create interference groups that account for MIMO capabilities, allowing the scheduling technique to adapt to multi-antenna devices while maintaining its interference avoidance functionality.
2Productivity
If multiple D2D links use the same resource, then resource reuse is improved, but signal interference between links increases
Solution Approach 1:
The patent converts the harmful effect of signal interference into a useful classification mechanism. By using interference checking based on the grouping criterion equation, it identifies which links would interfere with each other if using the same resource. This interference information is then used to create interference groups, where links within the same group are scheduled together because they have been determined to be compatible. This transforms the potential harm of interference into a beneficial scheduling decision that enables safe resource reuse.
Solution Approach 2:
The patent segments D2D links into different interference groups based on their interference characteristics. The grouping criterion equation divides links into groups where links within each group can share resources without causing harmful interference. This segmentation allows the system to maximize resource reuse by assigning the same resource to multiple links, while the segmentation ensures that only compatible links (those that don't interfere) are grouped together, thus resolving the contradiction between resource reuse and interference avoidance.
3Productivity
If communication mode is selected based on signal interference, then communication efficiency is improved, but system complexity increases
Solution Approach 1:
The patent implements dynamic communication mode selection based on real-time interference conditions. The system determines the communication mode (single user MIMO, Zero Forcing beamforming, or Interference Alignment beamforming) according to whether signal interference is detected and the specific interference group to which the link belongs. This dynamic adaptation allows the system to optimize communication efficiency by selecting the most appropriate mode for each situation while maintaining manageable complexity through standardized decision rules based on interference group membership.
Data Source
AI summary
An apparatus and method select a Device (D2D) communication mode according to whether there is signal interference. A method of operating a Transmitting (Tx) terminal, linked to a Receiving (Rx) terminal, for performing D2D communication includes confirming that the terminal is included in at least any one of groups in which links are grouped according to a link priority, receiving a result of determining whether there is a signal interference caused by at least three in-group links from the Rx terminal, and selecting a communication mode for communicating with the Rx terminal according to whether the signal interference exists.