Uplink Interference Mitigation via Coordinated Scheduling
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Solution Overview
Problem
Wireless communication networks face interference issues due to data transmissions from user equipment (UEs) that affect neighboring cells, degrading performance for all affected UEs, and existing methods do not effectively mitigate this interference.
Innovation Solution
A method and apparatus for wireless communication that involve receiving UE pilot information, monitoring pilot signal transmissions, determining UEs capable of causing high uplink interference, and using pre-scheduling information to schedule UEs in a way that mitigates interference by coordinating uplink traffic resource assignments between cells.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If UEs transmit data on uplink to their serving base station, then data transmission is enabled, but interference is caused to neighboring base stations degrading performance
Solution Approach 1:
The system performs preliminary identification of UEs capable of causing high uplink interference by monitoring pilot signal transmissions before actual data transmission occurs. This advance identification allows the network to prepare interference mitigation strategies, such as coordinating resource assignments with neighboring base stations, thereby reducing the harmful interference effect while maintaining data transmission productivity
Solution Approach 2:
The system implements a feedback mechanism where pilot signal transmission information is collected and analyzed to determine which UEs are likely to cause interference. This feedback loop enables dynamic adjustment of resource allocation and scheduling decisions to mitigate interference from identified UEs, resolving the contradiction between enabling data transmission and preventing harmful interference
2Reliability
If pilot signal transmission is monitored to identify interfering UEs, then interference mitigation is enabled, but additional signaling and processing overhead is introduced
Solution Approach 1:
The system leverages existing pilot signal transmissions that UEs send for channel estimation and uplink synchronization purposes. Instead of introducing separate dedicated signaling messages for interference identification, the system reuses these self-service pilot signals to gather interference information, thereby achieving reliable interference mitigation without adding significant signaling overhead or processing complexity
3Reliability
If uplink pre-scheduling information is exchanged between cells, then coordinated interference mitigation is achieved, but inter-cell signaling overhead increases
Solution Approach 1:
The system extracts only the essential interference-related information from the overall scheduling data that needs to be exchanged between cells. By identifying and extracting specifically the pre-scheduling information relevant to interfering UEs (such as resource assignments and timing), the system achieves coordinated interference mitigation while minimizing the volume of inter-cell signaling overhead, avoiding the need to exchange complete scheduling information
Data Source
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AI summary
Systems and methods providing uplink coordinated multi-point (CoMP) communication are shown. A second cell may identify at least one first UE communicating with a first cell and capable of causing high uplink interference to the second cell. The second cell may estimate uplink interference from the at least one first UE at the second cell. The second cell may estimate uplink interference on specific resources. For example, the second cell may determine resources assigned to the at least one first UE for data transmission to the first cell (e.g., using pre-scheduling information provided by the first cell) and estimate uplink interference from the at least one first UE on the resources assigned to the at least one first UE. The second cell may schedule at least one second UE for uplink data transmission to the second cell based on the estimated uplink interference from the at least one first UE.