Neighbor Assisted Combining for Localized Multicast Services
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Solution Overview
Problem
Simulcast method is inefficient for localized multicast services as it leads to interference from neighboring cells, reducing transmission efficiency and system capacity in scenarios where the service area is smaller than the system coverage.
Innovation Solution
A method and apparatus that utilize a network controller to determine user equipment locations and select serving and extended serving cells, where the latter influences transmissions to minimize interference by either broadcasting the same data or blocking resource elements, thereby reducing interference and increasing system capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If simulcast is used for localized multicast services, then coverage area is improved, but interference from neighboring cells increases and transmission efficiency decreases
Solution Approach 1:
The patent segments the network cells into three distinct categories: serving cells (transmitting multicast data), extended serving cells (coordinating to reduce interference), and other cells (blocking resource elements). This segmentation allows each cell type to perform its specific function optimally, resolving the contradiction between coverage and interference by organizing cells into functional groups rather than using uniform simulcast across all cells.
Solution Approach 2:
The patent applies local quality by assigning different transmission characteristics to different cell groups. Serving cells transmit multicast data with specific resource elements, extended serving cells coordinate to provide additional coverage while managing interference, and other cells block resource elements to eliminate interference. This localized differentiation allows the system to achieve both wide coverage and reduced interference simultaneously.
2Productivity
If all cells transmit on the same resource element for simulcast, then transmission efficiency is improved, but interference from non-serving cells increases
Solution Approach 1:
The patent introduces dynamic resource allocation where cells can switch between different transmission modes based on their role and interference conditions. Extended serving cells dynamically coordinate with serving cells to transmit on the same resource elements when beneficial, while other cells dynamically block resource elements to prevent interference. This dynamic approach allows the system to maintain high transmission efficiency while adapting to interference conditions in real-time.
Solution Approach 2:
The patent introduces extended serving cells as intermediaries between serving cells and other cells. These extended serving cells coordinate resource element usage to facilitate efficient multicast transmission while preventing interference from non-serving cells. They act as a buffer layer that manages the transition from high-efficiency simulcast to interference-free transmission by controlling which cells transmit and which cells block resources.
3Productivity
If localized multicast is implemented in selected cells, then transmission efficiency per unit area is improved, but interference management complexity increases
Solution Approach 1:
The patent applies universality by designing a multi-functional cell classification system that can handle multiple objectives simultaneously. The same three-cell classification framework (serving, extended serving, and other cells) is used across the entire network to achieve both localized efficient transmission and coordinated interference management. This universal framework reduces complexity by providing a standardized approach that can be applied uniformly throughout the network rather than requiring cell-specific complex management algorithms.
Data Source
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AI summary
A method and apparatus for neighbor assisted combining for localized multicast services. Cells (112) are determined (420) in which user equipment (120) reside that desire a common multicast service. At least one serving cell for transmitting the common multicast service is selected (430) based on the determination. At least one extended serving cell is selected (440) from at least one serving cell neighbor cell (114) which wherein no user equipment reside that desire the common multicast service, transmissions on the extended serving cell influencing transmissions on the serving cell. The common multicast service is transmitted (470) on the selected at least one serving cell.