Coordinated SIMO MIMO Codes for HetNet Interference Cancellation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Heterogeneous Networks (HetNets) face significant interference challenges that limit spectral efficiency and cell edge performance due to co-channel interference between Macro and Pico base stations, necessitating improved interference suppression methods.
Innovation Solution
The implementation of coordinated Single-Input and Multiple-Output (SIMO) and Multiple-Input and Multiple-Output (MIMO) codes among base stations, where parameters are shared to determine and suppress interference based on transmission modes, using real-valued and complex-valued encoding, and Widely Linear (WL) processing to enhance interference cancellation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If biased BS association is used to control user association between Macro and Pico BSs, then user association control is improved, but total interference power increases significantly
Solution Approach 1:
The patent converts the harmful co-channel interference from Macro BSs into a beneficial resource by enabling Pico BSs to transmit signals with the same codebook entries as their Macro BS counterparts. The interference is transformed into constructible signal components that can be jointly decoded at the UE, turning the previously harmful interference power into useful signal power that improves spectral efficiency.
Solution Approach 2:
The patent merges the transmission strategies of Macro and Pico BSs by using the same codebook entries for both types of base stations. This merging allows the UE to jointly decode signals from both Macro and Pico BSs using a unified reception framework, combining what were previously separate interference sources into a coordinated transmission system that improves overall spectral efficiency.
2Productivity
If Pico BSs are deployed within Macro BS coverage area, then network capacity scales linearly with total number of BSs, but cell edge performance deteriorates due to mutual interference
Solution Approach 1:
The patent applies different transmission modes selectively based on the local network configuration. Pico BSs can operate in SIMO mode (single antenna transmission) or MIMO mode (multiple antenna transmission) depending on the local deployment scenario and interference conditions. This local adaptation allows optimal performance for each specific cell edge user scenario while maintaining the overall network capacity benefits of Pico BS deployment.
Solution Approach 2:
The patent enables dynamic adaptation of transmission modes based on real-time channel conditions and interference levels. The system can switch between SIMO and MIMO modes, and between different codebook entries, based on the current operational state. This dynamic adaptation allows the system to maintain high spectral efficiency and cell edge performance across varying network conditions while scaling capacity through Pico BS deployment.
3Productivity
If co-channel interference is present in HetNets, then spectral efficiency is degraded, but interference cancellation capability is insufficient
Solution Approach 1:
The patent performs preliminary actions by pre-configuring the codebook entries and transmission modes before actual data transmission occurs. The system pre-establishes the mapping between Macro and Pico BS signals and prepares the reception framework in advance. This preliminary setup enables the UE to efficiently decode both desired and interference signals without requiring complex real-time processing, thereby improving both spectral efficiency and interference cancellation capability.
Data Source
AI summary
The embodiments herein disclose a method and system for interference cancellation in a Heterogeneous Network (HetNet) including a base station serving a User Equipment (UE), and a plurality of neighbor base stations. Further, the method includes sharing a parameter associated with the base station serving the UE and the plurality of neighbor base stations in the HetNet. Further, the method includes determining whether the UE is experiencing interference from the neighbor base station based on the parameters. Further, the method includes coordinating with the base station serving the UE to cancel the level of interference experienced by the UE based on the transmission mode associated with each base station serving the UE and the neighbor base station interfering at the UE. The transmission mode is one of a Single-Input and Multiple-Output (SIMO) and Multiple-Output and Multiple-Output (MIMO) mode.