Orthogonal Parameter Configuration for Uplink Interference Coordination
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Solution Overview
Problem
In ultra-dense networks, interference between neighboring cells is severe, particularly during uplink transmission, as existing interference coordination methods do not effectively prevent interference between user equipment (UE) in overlapping areas of small cells.
Innovation Solution
An interference coordination method where a first cell determines and notifies configuration information, including orthogonal parameters such as cyclic shift values or sequence codes, to terminals in overlapping areas to ensure interference-free uplink transmission, using radio resource control signaling to manage resource allocation and configuration between neighboring cells.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If eICIC is used with ABS subframes to protect resources in macro cells, then system throughput and cell edge throughput are improved, but interference between UEs in overlapping small cell areas during uplink transmission is not effectively reduced
Solution Approach 1:
The patent applies local quality by configuring cell-specific orthogonal parameters (cyclic shift values, orthogonal sequence codes) that are tailored to each cell's geographic coverage area. Terminals in overlapping regions receive configuration information from both small cells, and the network ensures orthogonal parameter allocation locally in each cell to prevent uplink interference, while maintaining global system throughput through selective application of these configurations.
Solution Approach 2:
The patent changes parameters by introducing cell-specific orthogonal parameters (cyclic shift values and orthogonal sequence codes) for uplink control information transmission. By varying these parameters across different cells and configuring them orthogonally, the system transforms the uplink transmission characteristics to eliminate interference in overlapping regions while preserving overall system productivity.
2Adaptability or versatility
If small cells are deployed densely to provide diversified services, then network coverage and service capability are improved, but interference between neighboring cells increases
Solution Approach 1:
The patent enables dense small cell deployment by implementing local quality control through cell-specific orthogonal parameter configurations. Each small cell is equipped with uniquely configured orthogonal parameters for uplink control information, allowing terminals in overlapping coverage areas to transmit without interfering with neighboring cells. This local differentiation enables high network density while maintaining service capability and reducing interference.
Solution Approach 2:
The patent applies segmentation by dividing the uplink control information resources into cell-specific orthogonal segments. Each small cell is assigned distinct orthogonal parameters (cyclic shift values, sequence codes) that segment the overall resource space. This segmentation allows multiple small cells to operate simultaneously in dense deployment without mutual interference, preserving both service capability and reducing harmful effects.
3Object-affected harmful factors
If orthogonal parameters are configured for terminals in overlapping areas, then uplink interference is reduced, but configuration complexity and signaling overhead increase
Solution Approach 1:
The patent reduces configuration complexity by implementing universality through a unified orthogonal parameter configuration mechanism that serves multiple functions. The same configuration framework (using cyclic shift values and orthogonal sequence codes) is applied across all cells and all terminal types, allowing the system to handle diverse scenarios (overlapping areas, edge users, different service types) through a single versatile configuration approach rather than multiple specialized mechanisms.
Solution Approach 2:
The patent applies self-service by enabling terminals to autonomously select and use the orthogonal parameters provided in their configuration information from the parameter pool. Terminals in overlapping areas automatically receive and apply the appropriate orthogonal parameters without requiring complex manual configuration or continuous network intervention, reducing signaling overhead and configuration complexity while maintaining interference reduction benefits.
Data Source
AI summary
An interference coordination method includes: determining, by a first cell, first configuration information of the first cell. The first configuration information includes a parameter for transmitting uplink control information UCI by a terminal served by the first cell, the parameter included in the first configuration information is a parameter configured for the first cell and is a parameter orthogonal to a parameter configured for a second cell, and the second cell is a neighboring cell of the first cell; and notifying, by the first cell, the first configuration information to the served terminal.