Cell Coordination on Resource Blocks for Interference Reduction
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Solution Overview
Problem
Current CoMP systems face performance degradation due to transmission delays between base stations and central control devices, leading to outdated channel state information and suboptimal user scheduling, especially when inter-cell interference is not adequately considered.
Innovation Solution
A method and apparatus for coordinating cells on multiple resource blocks by determining muted cells and resource blocks based on interference pools and load ratios, allowing for effective inter-cell interference reduction and improved scheduling even with large transmission delays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If centralized scheduling is performed based on instant channel state information transmitted from base station to central control device, then user scheduling performance is improved, but transmission delay on the backhaul line causes the channel state information to become outdated
Solution Approach 1:
The patent applies preliminary action by having the central control device determine muting states of cells in advance based on channel state information, and then notify base stations before actual data transmission. This allows the scheduling decision to be made proactively rather than reactively, reducing the impact of transmission delays on scheduling accuracy.
Solution Approach 2:
The patent segments the scheduling process into distinct phases: channel state measurement, muting state determination, and resource allocation. By dividing the centralized scheduling into these segments, the system can optimize each phase independently, particularly by determining muting states based on available channel information before final resource allocation decisions are made.
2Object-generated harmful factors
If joint scheduling is performed by the central control device to determine muting states of cells, then inter-cell interference is reduced, but the scheduling result becomes outdated when transmission delay is large
Solution Approach 1:
The central control device determines muting states of cells in advance based on channel state information received from base stations, and notifies these decisions to the base stations before data transmission begins. This preliminary determination of muting states ensures that interference coordination is established proactively, reducing the reliability issues caused by transmission delays.
Solution Approach 2:
The system dynamically adjusts muting states of cells based on current channel conditions and traffic demands. The central control device continuously receives channel state information, updates muting state decisions, and re-notifies base stations as needed, making the interference coordination adaptive rather than static, thus maintaining reliability despite varying transmission delays.
3Productivity
If base station performs independent user scheduling without considering neighbor cell states, then scheduling speed is improved, but good scheduling result cannot be obtained due to lack of coordination
Solution Approach 1:
The patent segments the scheduling function into two parts: the central control device determines cell-level muting states for interference coordination, while base stations perform user-level resource allocation independently. This segmentation allows the system to maintain fast local scheduling decisions while incorporating coordinated interference management from the central controller.
Solution Approach 2:
The central control device acts as an intermediary that coordinates between multiple base stations by determining muting states for each cell. This intermediary provides necessary coordination information to base stations, enabling them to perform independent user scheduling while still considering neighbor cell states through the muting state notifications, thus maintaining both speed and quality.
4Productivity
If more resource blocks are allocated for data transmission, then system throughput is improved, but inter-cell interference increases
Solution Approach 1:
The patent applies local quality by determining muting states specifically for resource blocks where inter-cell interference is most problematic. Instead of uniformly muting entire cells or resource blocks, the central control device identifies specific locations (resource blocks) where interference occurs and applies muting selectively, thereby maintaining system throughput while reducing interference locally where needed.
Solution Approach 2:
The system dynamically determines muting states for resource blocks based on real-time channel conditions and interference patterns. The central control device continuously monitors channel state information and adjusts which resource blocks require muting, allowing the system to maximize throughput by transmitting on resource blocks with low interference while muting only those blocks where interference would be harmful.
Data Source
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AI summary
A method and an apparatus for coordinating a cell on a plurality of resource blocks, and a method for selecting, by a central control device, a mode for coordinating a cell on a plurality of resource blocks in a communication system including a base station and the central control device are disclosed. The method for coordinating a cell comprises: determining whether the cell needs to be muted on at least one resource block; determining a ratio of the resource block on which the cell is muted to the plurality of resource blocks, in a case where the cell needs to be muted on the at least one resource block; and determining, based on the ratio, the resource block on which the cell is muted among the plurality of resource blocks, the resource block being a time resource block, a frequency resource block or a time-frequency resource block. Thus, in the case where a plurality of cells are deployed, inter-cell interference can be reduced, and meanwhile, even if a transmission delay on a line between the base station and the central control device is relatively large, it is possible to obtain a good cell coordination result and a user scheduling result.