Full-Duplex Self-Interference Mitigation Using Dedicated Radio Resources
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Solution Overview
Problem
Full-duplex wireless devices experience self-interference due to simultaneous transmission and reception, which hampers effective self-interference cancellation (SIC) procedures.
Innovation Solution
Devices request and configure dedicated time-frequency resources for self-interference mitigation procedures, allowing them to perform self-interference measurements without interference from other devices, thereby enabling accurate SIC coefficient adaptation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If dedicated time-frequency resources are allocated for self-interference mitigation procedures, then self-interference measurement precision is improved, but system resource utilization deteriorates due to temporary communication suspension
Solution Approach 1:
The system performs self-interference mitigation procedures in advance during dedicated resources before full-duplex communication begins. By pre-calculating self-interference coefficients during periods when other devices are muted, the system prepares cancellation parameters proactively, ensuring high measurement precision while minimizing impact on subsequent communication productivity.
Solution Approach 2:
The patent applies different resource allocation strategies to different spatial locations and device groups. Only specific devices that require self-interference mitigation are assigned dedicated resources, while other devices continue normal communication. This localized application of resource suspension maintains overall system productivity while achieving precise self-interference measurements for affected devices.
2Measurement precision
If other devices are muted during self-interference measurements, then measurement accuracy is improved, but communication efficiency deteriorates due to temporary transmission cancellation
Solution Approach 1:
The system implements periodic self-interference mitigation procedures at predetermined intervals rather than continuously muting devices. Other devices are muted only during these periodic measurement windows, allowing accurate self-interference measurements while maintaining communication efficiency during the remaining time. This periodic approach balances measurement accuracy needs with continuous communication requirements.
3Measurement precision
If network entities cancel overlapping transmissions for self-interference procedures, then coefficient determination accuracy is improved, but overall network throughput deteriorates
Solution Approach 1:
The network entity performs self-interference coefficient determination in advance during dedicated resources before full-duplex operations begin. By pre-calculating coefficients during periods when overlapping transmissions are canceled, the system ensures accurate coefficient determination while minimizing the duration of throughput reduction. These pre-determined coefficients are then reused during subsequent full-duplex communication.
Solution Approach 2:
The patent applies transmission cancellation selectively to specific network entities and frequency resources that require self-interference mitigation, rather than globally canceling all transmissions. This localized cancellation approach maintains accurate coefficient determination for affected entities while preserving network throughput for other entities and resources that do not require mitigation procedures.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. The described techniques generally provide for a wireless device (e.g., a user equipment (UE), a network entity) to use a set of resources for mitigating self-interference when communications in a full-duplex mode. For example, a UE may request a set of resources for performing a self-interference mitigation procedure. The UE may receive a configuration of the requested set of resources and transmit one or more self-interference measurement signals via the set of resources (e.g., in the absence of transmissions by other devices). In some examples, a network entity may transmit an indication of periodic resources, semi-persistent resources, or both, for a self-interference mitigation procedure performed by the network entity. In response, one or more UEs may cancel uplink transmissions that overlap with the indicated resources, such that the self-interference mitigation procedure is performed in the absence of uplink signals.