Spectrum Sensing Guard Interval Configuration in TD-LTE
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Solution Overview
Problem
Existing systems face challenges in implementing spectrum sensing without significantly increasing system complexity, particularly in protocols like TD-LTE, where quiet periods for interference-free spectrum sensing disrupt data transmission, requiring significant changes to existing protocols.
Innovation Solution
The method involves determining configuration information for a spectrum sensing guard interval within a guard period to prevent interference, setting a quiet period within this guard period, and performing spectrum sensing during the quiet period, ensuring compatibility with existing protocols without increased complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a quiet period is reserved in the frame structure for spectrum sensing, then spectrum sensing performance is guaranteed, but data transmission is interrupted and system complexity increases
Solution Approach 1:
The patent merges the quiet period with the guard period structure that already exists in TD-LTE systems. By configuring the quiet period to coincide with the guard period (which is already a non-data transmission interval used for uplink-downlink switching), the system achieves spectrum sensing capability without adding separate transmission interruptions or significantly increasing protocol complexity.
2Object-affected harmful factors
If the guard period is used for spectrum sensing, then transmission interference is prevented, but data transmission time is reduced
Solution Approach 1:
The guard period, which already serves the function of preventing uplink-downlink interference by being a non-data transmission interval, is made to serve an additional function: spectrum sensing. The system utilizes this existing idle time slot for dual purposes, avoiding the need for separate dedicated sensing periods that would further reduce transmission efficiency.
3Adaptability or versatility
If existing protocols are changed to accommodate quiet period settings, then spectrum sensing is enabled, but protocol compatibility is reduced
Solution Approach 1:
The patent makes the guard period multi-functional by enabling it to serve both its original purpose (preventing uplink-downlink interference) and a new purpose (spectrum sensing). This is achieved through configuration parameters that allow the quiet period to be aligned with the guard period structure, eliminating the need for separate protocol modifications while adding spectrum sensing capability.
Data Source
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AI summary
Embodiments of the present invention provide a method, device, and data frame for spectrum sensing. The method for spectrum sensing includes: determining configuration information of a spectrum sensing guard interval in a guard period GP used to prevent interference, where the spectrum sensing guard interval is used to prevent interference caused by signal transmission to spectrum sensing, and the configuration information is used to indicate a position of the spectrum sensing guard interval in the guard period; setting a quiet period in the guard period according to the configuration information of the spectrum sensing guard interval; and performing the spectrum sensing in the quiet period. In the present invention, the guard period in a transmission frame is used again, and the quiet period is set in the guard period, thereby ensuring the compatibility with an existing protocol; and the spectrum sensing guard interval including a front guard interval and/or a back guard interval is set, thereby effectively avoiding the interference caused by the signal transmission to the spectrum sensing, and the spectrum sensing is performed in the condition that the signal transmission is not affected.