Interference Management for Multiuser D2D Communication
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Solution Overview
Problem
Current D2D communication systems face challenges in managing interference between D2D UEs and WAN UEs, leading to reduced spectral efficiency, especially in partial or out-of-coverage scenarios, and require network resources that may be constrained during public safety situations.
Innovation Solution
Implementing interference management techniques in network nodes and D2D capable UEs to enable efficient D2D communication by reusing spectrum and optimizing transmission resources, allowing D2D pairs to operate independently of network nodes, and using interference cancellation methods to separate D2D and WAN signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If D2D UEs reuse spectrum with WAN UEs to improve spectral efficiency, then spectral efficiency is improved, but interference between D2D and WAN communications increases
Solution Approach 1:
The patent applies interference cancellation techniques that convert the harmful interference between D2D and WAN communications into a beneficial outcome. By detecting and canceling the interfering signal at the receiver, the system allows spectrum reuse while maintaining communication quality. This transforms the interference problem into an opportunity for improved spectral efficiency without degrading performance.
Solution Approach 2:
The system dynamically adjusts transmission parameters such as power levels and resource allocation based on interference conditions. By changing these parameters adaptively, the system optimizes spectral efficiency while controlling interference levels, allowing D2D and WAN communications to coexist effectively on the same spectrum resources.
2Reliability
If D2D communication operates independently of network nodes to improve reliability in partial or out-of-coverage scenarios, then reliability is improved, but network control and interference management capability deteriorates
Solution Approach 1:
The patent segments the D2D communication system into autonomous D2D pairs that can operate independently while maintaining optional network connectivity. This segmentation allows D2D communication to function reliably in partial or out-of-coverage scenarios without requiring continuous network control, while still enabling network-assisted interference management when available.
Solution Approach 2:
D2D pairs are equipped with autonomous interference management capabilities that allow them to self-manage their communications without network intervention. This self-service approach ensures reliable operation in coverage-limited scenarios while maintaining the option to receive network assistance when connected, effectively resolving the contradiction between independence and control.
3Loss of time
If network resources are allocated for D2D communication to reduce transmission delays, then transmission delay is reduced, but network resource availability for other UEs deteriorates
Solution Approach 1:
The patent merges D2D communication traffic with WAN communication traffic by allowing them to share the same spectrum resources simultaneously. This combining approach eliminates the need for dedicated D2D resources, reducing transmission delays for D2D pairs while maintaining resource availability for WAN UEs through efficient multiplexing and interference cancellation.
Data Source
Figure 1A~1C
Figure 2A~2B
Figure 3~4
AI summary
A method of interference management of multiuser in-coverage device-to-device communications at a network node is presented. A WAN signal from a WAN device is received, the WAN signal being mixed with an interferer signal caused by a D2D communication between a transmitting D2D device and a receiving D2D device of a D2D pair. An attribute value difference between a first attribute value of the WAN signal and a second attribute value of the interferer signal is determined. If the attribute value difference does not meet a target difference, a transmission parameter of at least one of the WAN device and the transmitting D2D wireless device is controlled to adjust the difference to meet the target difference.