Maximum Power Spectral Density Reporting for Interference Coordination
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Solution Overview
Problem
Current wireless communication systems, particularly in LTE networks, face challenges in effectively coordinating inter-cell interference, which affects spectral efficiency and user experience, especially at the cell edge, due to limited mechanisms for reporting and managing interference overload across neighboring cells.
Innovation Solution
The method involves receiving overload indicator messages from neighboring access points, calculating and reporting maximum power spectral density information for subcarriers, and multiplexing this information with other data to a serving access point to facilitate inter-cell interference coordination (ICIC) through advanced multiplexing techniques, enabling better scheduling and resource allocation to reduce interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If maximum power spectral density information is reported separately for each subcarrier, then measurement precision is improved, but device complexity and loss of information increase due to large payload size
Solution Approach 1:
The patent applies partial action by reporting power spectral density information selectively rather than for every subcarrier. It uses subband-based reporting where multiple subcarriers are grouped, and only representative or differentiated PSD values are reported based on interference conditions, reducing payload size while maintaining necessary measurement precision for ICIC decisions
Solution Approach 2:
The patent merges PSD reporting with existing uplink control information channels (PUCCH, PUSCH) that carry CQI, PMI, and RI reports. By combining multiple information types into a unified reporting structure, the patent reduces overall signaling overhead and device complexity while maintaining the precision of individual measurements
2Measurement precision
If detailed interference information is reported for all subcarriers, then measurement precision is improved, but loss of information increases due to payload size limitations
Solution Approach 1:
The patent segments the frequency spectrum into subbands for interference reporting purposes. By dividing the full bandwidth into manageable subband portions, the system can report PSD information at appropriate granularities - detailed reporting for subbands with high interference variability and coarser reporting for subbands with uniform interference characteristics - thus preserving critical information while reducing overall payload requirements
Solution Approach 2:
The patent changes the reporting parameter from individual subcarrier PSD values to subband-averaged or subband-maximum PSD values. This parameter transformation reduces the dimensionality of the reporting data while maintaining the essential interference information needed for ICIC, preventing information loss in the most critical interference assessment dimensions
3Adaptability or versatility
If real-time interference data is collected and reported, then adaptability is improved, but loss of time increases due to processing and reporting overhead
Solution Approach 1:
The patent implements periodic reporting of PSD information aligned with existing CQI reporting periods. By synchronizing interference reporting with periodic channel quality assessments rather than requiring continuous real-time reporting, the system maintains scheduling adaptability through regular updates while significantly reducing the time loss associated with frequent interrupt-based reporting overhead
Data Source
AI summary
Certain aspects of the present disclosure propose methods for reporting information such as a maximum power spectral density to a serving access point after receiving overload indicators from one or more neighboring access points. The reported information may be multiplexed with other information (e.g., Channel Quality Indicator (CQI), Precoding Matrix Index (PMI), rank indication (RI) or acknowledgement (ACK)/negative acknowledgment (NACK) message for downlink data channel) before transmission to the serving access point. In addition, the information may be transmitted in a medium access control (MAC) packet data unit (PDU).