Cluster-Specific CSI Feedback for Interference Mitigation
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Solution Overview
Problem
Existing CSI feedback methods in wireless communication networks do not distinguish between base stations of the same cluster and neighboring clusters, leading to interference issues and inefficient resource allocation in high-density deployments, particularly in cloud radio networks.
Innovation Solution
User equipment (UE) measures signal strength across multiple base stations, selects a set of base stations with the highest signal strength, and reports channel state information (CSI) feedback to the cloud system, including identifiers of both macro and pico base stations and their associated antenna ports, to facilitate better interference management and resource allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If existing CSI feedback methods are used in high-density deployments, then network coverage is maintained, but intra-cluster and inter-cluster interference increases leading to degraded quality of service
Solution Approach 1:
The patent segments the feedback process into two distinct parts: cluster-specific CSI feedback for intra-cluster interference mitigation and neighboring cluster BS ID feedback for inter-cluster interference mitigation. This segmentation allows the system to handle different interference types with specialized feedback mechanisms, improving overall QoS in high-density deployments.
Solution Approach 2:
The patent changes the feedback parameters by introducing cluster-specific CSI feedback that includes precise channel state information for base stations within the same cluster, and separately collecting BS IDs of neighboring cluster base stations. This parameter differentiation enables targeted interference mitigation strategies for intra-cluster and inter-cluster scenarios.
2Object-affected harmful factors
If centralized precoding is used to eliminate intra-cluster interference, then intra-cluster interference is reduced, but CSI of neighboring cluster base stations becomes necessary for inter-cluster scheduling
Solution Approach 1:
The patent segments CSI feedback requirements into two categories: cluster-specific CSI for base stations within the same cluster (used with centralized precoding) and BS IDs of neighboring cluster base stations (used for inter-cluster scheduling). This segmentation clarifies the distinct purposes of different feedback information and reduces unnecessary feedback overhead.
Solution Approach 2:
Instead of requiring full CSI of all neighboring base stations, the patent applies partial action by collecting only BS IDs of neighboring cluster base stations that cause dominant interference. This selective approach reduces feedback complexity while still enabling effective inter-cluster scheduling decisions.
3Power
If high density deployment of ATPs is implemented, then transmit power can be reduced, but frequent handovers occur
Solution Approach 1:
The patent employs enhanced feedback mechanisms including cluster-specific CSI feedback and neighboring cluster BS ID feedback, which provide the network with precise channel state information. This feedback enables more accurate user scheduling and cell selection decisions, reducing the frequency of handovers in high-density ATP deployments while maintaining low transmit power.
Data Source
AI summary
Embodiment herein provide a method and system of reporting cluster specific CSI feedback by user equipment (UE) to a cloud system. The UE associates with the cloud using a biased association or an unbiased association. In a biased association, a ratio between the highest received power from a Macro BS and a Pico base station is determined by the UE and compared with a threshold (bias). If the ratio is greater than the bias, the UE associates with the Pico BS. The UE reports CSI for a set of dominant Macro BSs and Pico BSs within a cluster. The UE can report the IDs of the BSs which contribute to dominant interference caused by the BSs of neighboring clusters.