Full-Duplex Self-Interference Measurement Using Transmission Gaps
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Full-duplex wireless communication devices experience self-interference due to signal reflections from nearby surfaces, leading to modem desensing, which existing technologies struggle to accurately measure and cancel.
Innovation Solution
Implementing measurement gaps in transmission patterns to estimate the clutter model, allowing devices to accurately measure and cancel self-interference by defining gaps based on parameters such as density, duration, and on/off patterns, facilitating updated models for mobility and clutter changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If full-duplex transmission is implemented to enable simultaneous transmit and receive operations, then communication efficiency is improved, but self-interference from signal reflections increases causing modem desensing
Solution Approach 1:
The patent applies preliminary action by performing self-interference measurements during dedicated measurement gaps before actual communication occurs. The UE transmits reference signals during these gaps and measures the reflected signals to characterize the clutter model in advance, enabling the network to compensate for self-interference effects during normal full-duplex operation.
Solution Approach 2:
The patent introduces measurement gaps as an intermediary mechanism that separates the self-interference measurement process from the normal communication process. These gaps act as dedicated time slots where the network can characterize clutter effects without interfering with actual data transmission, allowing the UE to report measurement results back to the network for compensation.
2Measurement precision
If measurement gaps are introduced to characterize clutter model, then self-interference measurement accuracy is improved, but transmission time is reduced
Solution Approach 1:
The patent applies partial action by introducing measurement gaps as a fraction of the total communication time rather than continuously. The gaps are configured with specific density and duration parameters that balance measurement accuracy requirements against transmission efficiency. The network can adjust the proportion of time allocated to measurements versus data transmission based on clutter conditions.
Solution Approach 2:
The patent utilizes parameter changes by allowing flexible configuration of measurement gap characteristics including density (how frequently gaps occur), duration (how long each gap lasts), and timing (when gaps occur within communication frames). These parameters can be dynamically adjusted based on channel conditions, UE mobility, and clutter characteristics to optimize the trade-off between measurement accuracy and transmission time.
3Measurement precision
If measurement gaps are configured with high density and duration to accurately capture mobility and clutter changes, then model accuracy is improved, but device complexity increases
Solution Approach 1:
The patent applies dynamics by enabling adaptive configuration of measurement gap patterns that can change over time based on detected conditions. The network can adjust gap density, duration, and timing dynamically in response to UE mobility, clutter changes, or communication requirements. This allows the system to use more aggressive measurement configurations when needed and more conservative configurations when conditions are stable.
Solution Approach 2:
The patent segments the measurement gap configuration into multiple independent parameters including density, duration, and timing patterns. This segmentation allows the network to optimize each parameter independently and combine them in various configurations. The gap pattern can be divided into different types (e.g., periodic gaps, random gaps, event-triggered gaps) that can be selected or combined based on specific measurement requirements.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enhances the accuracy of self-interference cancellation, improving the performance of full-duplex communications and conserving resources by adapting to changing clutter conditions.
Implementation Method 1
measuring self-interference caused by reflection of the signal as received at a receiver of the UE
Data Source
AI summary
Aspects described herein relate to defining gaps within a time period for measuring self-interference due to clutter. The gaps can be defined for a device to measure self-interference caused by reflection of the signal, or may be specified by a network node to cause the device to refrain from transmitting so the network node can measure self-interference caused by reflection of the signal.