OSI Indication Subzone Mapping for Interference Mitigation
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Solution Overview
Problem
Wireless communication systems face interference issues due to non-orthogonal transmissions from multiple terminals, which degrade performance and require effective mitigation techniques.
Innovation Solution
The system estimates inter-sector interference and generates OSI indications, including regular and fast OSI indications, to convey interference levels, allowing terminals to adjust their transmit power and reduce interference by transmitting OSI indications efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If terminals transmit at high power to ensure communication quality, then communication reliability is improved, but inter-sector interference increases
Solution Approach 1:
The system implements feedback mechanisms where sectors transmit OSI indications to neighboring sectors about observed interference levels. Terminals use this feedback information to dynamically adjust their transmit power, creating a closed-loop control system that balances communication reliability with interference reduction.
Solution Approach 2:
The patent introduces dynamic power adjustment capabilities where terminals can change their transmit power levels in real-time based on received OSI indications. The system supports both regular OSI indications for long-term average interference and fast OSI indications for short-term interference, enabling dynamic response to varying interference conditions.
2Reliability
If sectors transmit OSI indications frequently to enable real-time power adjustment, then interference mitigation effectiveness is improved, but signaling overhead increases
Solution Approach 1:
The patent segments OSI indications into two types: regular OSI indications that convey long-term average interference information, and fast OSI indications that convey short-term interference information. This segmentation allows the system to transmit only the most critical interference information, reducing signaling overhead while maintaining effective interference mitigation.
Solution Approach 2:
The system transmits fast OSI indications specifically for subzones experiencing high interference, rather than uniformly across all frequency resources. This localized approach to information transmission reduces overall signaling overhead by focusing resources only where interference mitigation is most needed.
Data Source
AI summary
Techniques for mitigating interference in a wireless communication system are described. In one design, a sector may determine multiple fast other sector interference (OSI) indications for multiple subzones, with each subzone corresponding to a different portion of the system bandwidth. At least one report may be generated for the multiple OSI indications, with each report including at least one OSI indication for at least one subzone. Each report may be encoded to obtain code bits, which may then be mapped to a sequence of modulation symbols. A sequence of modulation symbols of zero values may be generated for each report with all OSI indications in the report set to zero to indicate lack of high interference in the corresponding subzones. This allows a report to be transmitted with zero power in a likely scenario. A regular OSI indication may also be determined for the system bandwidth and transmitted.