Dynamic Cell Selection for Coordinated Multipoint Transmission
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Solution Overview
Problem
In wireless communications networks, inter-cell interference constrains throughput due to overlapping signal transmissions from multiple base stations, which existing technologies have not effectively addressed.
Innovation Solution
The base station coordinates transmission of resource blocks with another base station and punctures overlapping resource elements to avoid data transmission in those areas, allowing subscriber stations to receive data without reading overlapping resource elements, thereby reducing interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple base stations transmit signals to their respective UEs simultaneously, then network coverage and service capacity are improved, but inter-cell interference increases and throughput is constrained
Solution Approach 1:
The patent implements dynamic cell selection where the serving cell for each UE is determined dynamically based on current channel conditions and interference levels rather than being fixed. The base station selects from multiple candidate cells (CoMP set) the most appropriate transmitting cell, adapting to changing network conditions to maximize throughput while minimizing interference
Solution Approach 2:
The patent changes the parameter of cell selection from static to dynamic by introducing a selection mechanism that evaluates multiple candidate cells based on channel quality indicators (CQI) and interference measurements. This allows the system to switch between different transmitting cells optimally, transforming the cell selection parameter to resolve the throughput-interference contradiction
2Productivity
If resource blocks are allocated to multiple UEs across different cells, then resource utilization is improved, but overlapping resource elements cause interference and data loss
Solution Approach 1:
The patent applies preliminary action by having the base station predict and identify potential overlapping resource elements between different cells before data transmission occurs. The CRS patterns of candidate cells are analyzed in advance to determine which resource elements might overlap, and these are marked for puncturing prior to actual data transmission, preventing interference before it occurs
Solution Approach 2:
The patent extracts and removes the problematic overlapping resource elements from the transmission by puncturing them. Instead of transmitting data on resource elements that would overlap with CRS from other cells, the system identifies these overlapping elements and excludes them from data transmission, effectively taking out the source of interference to ensure reliable data transmission
3Productivity
If base stations transmit on all available resource elements, then transmission efficiency is improved, but signal quality deteriorates due to interference in overlapping regions
Solution Approach 1:
The patent applies local quality by treating different resource elements differently based on their interference characteristics. Instead of uniform transmission across all resource elements, the system identifies specific resource elements that are prone to interference (those overlapping with CRS patterns) and applies puncturing only to those local regions, while maintaining full transmission on non-overlapping elements, thus preserving overall transmission efficiency while improving signal quality in critical areas
Data Source
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AI summary
A method for communication between a base station and a subscriber station, and apparatuses thereof, are provided. The method comprises generating, by a base station, a bitmap indicating at least one resource element, which is not used for transmission, among a plurality of resource elements based on information related to a reference signal, and transmitting control information including the bitmap to the subscriber station.