Base Station Signal Rank Determination for Inter-Cell Interference
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Solution Overview
Problem
In wireless communication systems, the increasing traffic and inter-cell interference limit performance, especially for users with interference suppression capabilities, as the effectiveness of interference suppression receivers decreases with multiple interferers, leading to performance degradation for users near cell borders.
Innovation Solution
A method for determining the transmission signal rank in base station nodes that takes into account the active status and interference suppression capabilities of neighboring cells, adjusting the rank to minimize interference impact on adjacent cells, thereby improving performance for users with interference suppression receivers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If MIMO transmissions with high transmission signal rank are used to increase throughput, then data throughput is improved, but inter-cell interference increases and performance of users in neighboring cells deteriorates
Solution Approach 1:
The transmission signal rank is made dynamic rather than fixed. The base station adapts the rank based on real-time feedback about interference suppression capabilities of neighboring cell devices. This allows the system to switch between high-rank transmissions (when no interference suppression is needed) and low-rank transmissions (when neighboring devices can suppress interference), resolving the contradiction between throughput and interference.
Solution Approach 2:
The system changes the transmission parameter (signal rank) based on the capabilities of receiving devices in neighboring cells. When feedback indicates that neighboring devices have interference suppression capability, the base station reduces the transmission rank to minimize interference. This parameter adaptation resolves the contradiction by adjusting transmission characteristics to match channel and interference conditions.
2Object-affected harmful factors
If transmission signal rank is reduced to minimize interference to neighboring cells, then inter-cell interference is reduced, but throughput for the served user deteriorates
Solution Approach 1:
The system employs feedback mechanisms where base stations exchange information about the interference suppression capabilities of devices in their respective cells. This feedback allows each base station to make informed decisions about transmission rank selection, ensuring that rank reduction only occurs when neighboring devices actually have the capability to suppress interference, thus minimizing unnecessary throughput loss.
Solution Approach 2:
Devices with interference suppression capabilities are identified and their capabilities are communicated to neighboring base stations. These devices effectively 'service' themselves by providing feedback about their ability to handle interference, allowing the system to automatically adjust transmission parameters without manual intervention, thus resolving the throughput-interference tradeoff.
3Reliability
If interference suppression capabilities are utilized in neighboring cells, then user satisfaction for cell-edge users is improved, but system complexity increases due to advanced algorithms and multiple antennas
Solution Approach 1:
The interference suppression capability is extracted as a distinct feature that can be identified and communicated through feedback. Rather than requiring all receivers to have complex interference suppression capabilities, the system identifies which devices have this capability and uses that information to adjust transmissions accordingly. This allows the benefit of interference suppression to be realized without requiring all devices to be complex.
Data Source
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AI summary
The present disclosure relates to a method (20) for transmission signal rank determination performed in a base station node (3) of a communication system (1). The base station node (3) serves a first cell (9) and the first cell (9) has a neighboring cell (8) served by a neighboring base station node (2). The base station node (3) is configured for multiple-input, multiple output communication with a first wireless device (7). The method (20) comprises receiving (21), from a node (2); (10) of the communication system (1), information related to the neighboring cell (8), and determining (22), based on the received information, a signal rank of a data transmission to the first wireless device (7) located within the first cell (9).