Control Node Sounding Parameter Coordination for Interference Management
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Solution Overview
Problem
High-frequency wireless communication networks face challenges such as hidden node and deafness problems due to high gain beam-forming, leading to complex interference management and inadequate interference measurement in multi-Gigabit wireless systems like 5G networks, where traditional carrier sensing methods are insufficient for identifying inter-link interference.
Innovation Solution
The method involves coordinating sounding and sensing parameters between neighboring networks to align directional sounding and sensing windows, allowing receivers to be in a directional sensing state when transmitters send directional signals, enabling accurate identification of interfering links and improved interference measurement through Directional Link Interference Maps (DLIMs).
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If high gain beam-forming is used to compensate propagation loss at high frequencies, then beam-forming gain is improved, but hidden node and deafness problems occur leading to inadequate interference measurement
Solution Approach 1:
The patent applies preliminary action by having transmitters send directional sounding signals before actual data transmission, and receivers perform directional sensing in advance to identify potential interfering links. This allows the system to pre-establish beamforming parameters and interference measurements, resolving the contradiction by preparing the measurement mechanism before the harmful effects of high gain beam-forming manifest during data transmission
Solution Approach 2:
The patent introduces directional sounding signals and directional sensing as intermediary mechanisms between the high gain beam-forming transmission and the interference measurement. These intermediaries enable the system to measure interference accurately by using dedicated sounding/sensing resources that are separate from data transmission, thus resolving the measurement inadequacy caused by hidden node and deafness problems
2Device complexity
If traditional carrier sensing methods are used in high-frequency networks, then device complexity is reduced, but interference management becomes insufficient for identifying inter-link interference
Solution Approach 1:
The patent transitions from traditional omnidirectional carrier sensing to directional sounding and sensing in the spatial dimension. By introducing beamforming techniques that operate in specific directions rather than omnidirectionally, the system achieves accurate inter-link interference identification while maintaining manageable complexity through standardized beamforming procedures
Solution Approach 2:
The patent changes the sensing parameters from traditional carrier sensing thresholds to directional beamforming parameters including beam direction, gain, and spatial filtering characteristics. This parameter transformation enables the system to identify inter-link interference by measuring signal strength and directionality in specific spatial dimensions, achieving superior interference management capability
3Adaptability or versatility
If directional sounding and sensing windows are not aligned between neighboring networks, then network independence is maintained, but inter-network interference coordination becomes inadequate
Solution Approach 1:
The patent segments the sounding and sensing operations into coordinated time-frequency resources between neighboring networks. By dividing the available resources into specific windows for directional sounding and sensing, and aligning these windows across network boundaries, the system maintains network independence while enabling accurate inter-network interference measurement through structured resource allocation
Solution Approach 2:
The patent implements feedback mechanisms where control nodes exchange sounding and sensing parameter information with neighboring networks. This feedback loop enables dynamic coordination of directional sounding and sensing windows, allowing networks to adapt their resources based on measured interference conditions while maintaining operational independence, thus resolving the contradiction between independence and coordination
Data Source
AI summary
Method used in a first control node controlling one or more first links among two or more first radio nodes in a first network, and an associated first control node. Transmitting desired sounding and sensing related parameters of the first control node to a second control node controlling one or more second links among two or more second radio nodes in a second network neighboring the first network and operating at the same frequency as the first network. Receiving, from the second control node, sounding and sensing related parameters to be applied to the one or more second links, which are adjusted based on the desired sounding and sensing related parameters of the first control node. Adjusting the desired sounding and sensing related parameters of the first control node, based on the sounding and sensing related parameters to be applied to the one or more second links and applying them.