NAICS Power Offset Signaling for Inter-Cell Interference Mitigation
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Solution Overview
Problem
Current network-assisted interference cancellation and suppression (NAICS) techniques in broadband wireless communications lack effective methods to provide user equipment (UE) with necessary network-side parameters, such as power offset values, to enhance inter-cell interference mitigation.
Innovation Solution
The implementation of power offset signaling techniques, where serving eNBs transmit NAICS assistance information, including serving cell and proximate cell power offset information, within RadioResourceConfigDedicated fields of RRC connection control messages to UE, enabling more precise interference mitigation algorithms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If network-side parameters such as power offset values are provided to UE to enhance interference mitigation, then spectral efficiency is improved, but device complexity increases due to additional signaling requirements
Solution Approach 1:
The power offset signaling is segmented into two distinct parameters: pa (power offset between CRS and PDSCH) and pa2 (power offset between CRS and PDSCH for QPSK modulation). This segmentation allows the system to provide detailed interference mitigation information while organizing the signaling in a structured manner within the RRC connection control message, balancing the need for comprehensive parameters with manageable signaling complexity.
Solution Approach 2:
The network pre-calculates and provides the power offset values (pa and pa2) to the UE through RRC signaling before the UE needs to perform interference cancellation. This preliminary action enables the UE to have all necessary parameters ready in advance, improving spectral efficiency without requiring complex real-time signaling during data transmission.
2Adaptability or versatility
If multiple power offset parameters are signaled to support different modulation schemes, then adaptability is improved, but loss of information increases due to larger signaling overhead
Solution Approach 1:
Different power offset parameters are assigned to different modulation schemes based on their specific requirements. The pa parameter is used for general PDSCH power offset, while pa2 is specifically tailored for QPSK modulation. This local quality approach ensures each modulation scheme receives the appropriate power offset information without requiring all parameters to be signaled for every scheme, reducing signaling overhead while maintaining adaptability.
Solution Approach 2:
The system uses parameter changes to adapt to different modulation schemes by selecting appropriate power offset values (pa or pa2) based on the modulation type. This allows the network to provide precise control over PDSCH power for different modulations without requiring separate complete parameter sets for each scheme, thereby reducing the information loss due to signaling overhead.
3Reliability
If power offset information is included in RRC connection control messages, then interference mitigation effectiveness is improved, but ease of operation decreases due to modified protocol procedures
Solution Approach 1:
The RRC connection control message structure is extended to include power offset parameters (pa and pa2) that serve multiple functions: they provide interference mitigation information for NAICS receivers, support different modulation schemes, and enable both semi-static and dynamic signaling mechanisms. This multi-functionality improves interference mitigation effectiveness while avoiding the need for separate dedicated signaling protocols, thereby maintaining relative ease of operation.
Solution Approach 2:
The RRC connection control message acts as an intermediary that carries power offset information from the network to the UE. By using this existing control message structure rather than creating new dedicated signaling procedures, the patent reduces protocol implementation complexity while still providing the necessary interference mitigation parameters to improve reliability.
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AI summary
Power offset signaling techniques for network-assisted interference cancellation and suppression (NAICS) receivers are described. In one embodiment, for example, user equipment (UE) may comprise at least one radio frequency (RF) transceiver, at least one RF antenna, and logic, at least a portion of which is in hardware, the logic to receive a radio resource control (RRC) connection control message comprising a RadioResourceConfigDedicated field and perform a radio resource configuration procedure in response to receipt of the RRC connection control message, the RRC connection control message to comprise network-assisted interference cancellation and suppression (NAICS) assistance information that identifies a power offset value for one or more transmissions to the UE over a physical downlink shared channel (PDSCH) of a serving cell of the UE. Other embodiments are described and claimed.