Cell Coordination Group Selection for Interference Management
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Solution Overview
Problem
Existing interference coordination techniques in heterogeneous telecommunication networks struggle to accurately determine cell coordination groups, especially in dense urban environments with 'street canyon' and 'building shadowing' effects, leading to inefficiencies in interference management due to limitations in hardware and software capabilities.
Innovation Solution
A method for identifying and grouping cells based on cell traffic statistics, path loss, signal strength, delay, and transport capacity, where neighbor cells with interconnecting transport delay below a limit and transport capacity above another limit are selected for interference management, forming a cell coordination group that maximizes cooperation among cells.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If many small cells are deployed to improve coverage in dense urban areas, then coverage quality is improved, but inter-cell interference increases and interference management complexity increases
Solution Approach 1:
The patent segments the network into cell coordination groups, where cells are divided into different groups based on their coordination relationships. This segmentation allows interference management to be applied selectively within groups, reducing overall inter-cell interference while maintaining good coverage through the heterogeneous small cell deployment.
2Productivity
If existing interference coordination techniques are applied to heterogeneous networks, then interference management is attempted, but accuracy is insufficient due to building shadowing and street canyon effects
Solution Approach 1:
The patent performs preliminary actions by pre-defining cell coordination groups based on network configuration and cell characteristics before interference occurs. The network node determines which cells belong to the same coordination group in advance, using this pre-established structure to improve the accuracy of interference management despite building shadowing and street canyon effects that make real-time measurement difficult.
3Object-generated harmful factors
If cell coordination groups are formed for interference management, then interference is reduced, but hardware and software capability limitations constrain the implementation
Solution Approach 1:
The patent applies partial action by forming cell coordination groups that include only the necessary subset of cells for effective interference management, rather than coordinating all cells in the network. The network node determines coordination groups selectively, applying interference management techniques only where needed, thus reducing the hardware and software capability requirements while still achieving interference reduction.
Data Source
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AI summary
The application relates to the selection of cells to form a cell coordination group for which interference management techniques such as COMP are to be applied. The cells to be selected to improve the performance of a UE in terms of throughput or delay are not necessarily the ones which are geographically the closest because in city environments shadowing effects of buildings exist. Thus, choosing the closest cells for coordinated interference management will not be a good solution in many cases. Hence, there is a need to develop another method and mechanism for more accurately generating a cell coordination group for interference management activities. This problem is solved by the application in that either the downlink interference toward the UE from the neighboring cells is estimated or the neighbor cells listen for the UE and then predict the downlink interference. Furthermore, the algorithm starts with an initial list of cells comprising the most likely handover candidates. Furthermore, cells are eliminated if the interconnection link to the serving base station is not fast enough for the interference reducing algorithms.