Interference Suppression via Spatial Channel Characteristics
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Solution Overview
Problem
Current wireless communication networks face challenges in efficiently mitigating interference without requiring extensive signaling, calibration, and synchronization between network nodes, leading to suboptimal resource utilization and reduced system performance.
Innovation Solution
A method and network node configuration that determines when uplink sounding is needed for interference suppression, allowing for targeted participation in uplink sounding by user equipment and neighbor network nodes, and applying precoders based on spatial channel characteristics to minimize interference during downlink transmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If network nodes perform extensive uplink sounding and coordination for interference suppression, then interference mitigation performance is improved, but signaling overhead and system complexity increase
Solution Approach 1:
The patent applies preliminary action by having network nodes perform uplink sounding in advance to obtain spatial channel characteristics before downlink transmissions occur. The serving network node triggers uplink sounding and stores the measured spatial channel characteristics in a database, so that when downlink transmissions need interference suppression, the characteristics are already available. This eliminates the need for real-time coordination and extensive signaling during actual downlink transmissions, as the interference suppression can be performed using pre-acquired channel information.
2Productivity
If network nodes use optimal precoders for their own users, then resource utilization in current cell is maximized, but interference to neighboring cells increases
Solution Approach 1:
The patent implements feedback by having the serving network node provide an indication to neighbor network nodes about the spatial channel characteristics and precoding information. The neighbor network nodes use this feedback information to adjust their own precoders and perform interference suppression. This feedback mechanism allows the system to coordinate interference mitigation across cell boundaries while maintaining good resource utilization in each individual cell, as each node has the necessary information to optimize both local performance and overall system interference.
3Object-affected harmful factors
If network nodes acquire channel state information for all user equipment, then interference suppression capability is improved, but measurement and processing overhead increases
Solution Approach 1:
The patent applies local quality by having each network node acquire and store spatial channel characteristics specifically for locations where its own users may experience interference from neighbor cells. Instead of acquiring channel state information for all user equipment in the network, each node focuses on obtaining characteristics for relevant geographic locations identified through uplink sounding. The serving network node determines which locations require interference suppression and triggers targeted uplink sounding only for those specific locations, reducing overall measurement overhead while maintaining effective interference suppression capability where needed.
Data Source
AI summary
There is provided mechanisms for interference suppression in a wireless communication network. A method is performed by a network node. The method includes determining that uplink sounding is to be performed for a first user equipment served by the network node and located at a location. The method includes providing a notification to a neighbor network node and the first user equipment to participate in the uplink sounding of the first user equipment. The method includes determining to perform a downlink transmission towards a seconduser equipment served by the network node and located at the location. The method includes providing an indication for interference suppression at the location to the neighbor network node before performing the downlink transmission.