User Terminal LBT Sensing Subframe PUSCH Transmission
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Solution Overview
Problem
In LTE systems operating in unlicensed bands, the lack of coordination between different operators and systems leads to potential cross-interference, and the existing Listen Before Talk (LBT) mechanisms introduce significant delays in uplink transmissions, reducing overall system throughput.
Innovation Solution
A user terminal equipped with a receiving process for detecting channel states through LBT in a sensing subframe, a control section for managing the sensing subframe, and a transmission section for transmitting predetermined information related to PUSCH transmission based on LBT results, allowing for reduced delay and improved throughput.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If LBT (Listen Before Talk) is performed in sensing subframes before uplink transmission, then cross-interference in unlicensed bands is reduced, but transmission delay increases and system throughput decreases
Solution Approach 1:
The patent performs LBT (Listen Before Talk) in advance in sensing subframes to detect channel availability before actual uplink transmission. This preliminary channel assessment allows the system to prepare for transmission while minimizing the impact on throughput by using dedicated sensing subframes separate from data transmission subframes.
Solution Approach 2:
The patent divides the unlicensed band operation into separate sensing subframes and data transmission subframes. The sensing subframes are specifically designated for LBT operations, while other subframes are used for actual data transmission. This segmentation allows channel detection to occur without blocking data transmission opportunities.
2Measurement precision
If LBT is performed in sensing subframes, then channel state detection is improved, but overall system throughput decreases due to transmission delays
Solution Approach 1:
The patent performs LBT (Listen Before Talk) in advance in sensing subframes to detect channel availability before actual uplink transmission. This preliminary channel assessment allows the system to prepare for transmission while minimizing the impact on throughput by using dedicated sensing subframes separate from data transmission subframes.
Solution Approach 2:
The patent implements a feedback mechanism where the base station receives LBT results from the user terminal and provides subsequent transmission grants based on channel availability. This feedback loop allows the system to adapt transmission scheduling to actual channel conditions, improving both detection accuracy and throughput efficiency.
3Loss of time
If user terminals transmit PUSCH information in the same subframe as LBT results, then transmission delay is reduced, but interference control becomes more difficult
Solution Approach 1:
The patent performs LBT (Listen Before Talk) in advance in sensing subframes to detect channel availability before actual uplink transmission. This preliminary channel assessment allows the system to prepare for transmission while minimizing the impact on throughput by using dedicated sensing subframes separate from data transmission subframes.
Solution Approach 2:
The patent implements a feedback mechanism where the base station receives LBT results from the user terminal and provides subsequent transmission grants based on channel availability. This feedback loop allows the system to adapt transmission scheduling to actual channel conditions, improving both detection accuracy and throughput efficiency.
Data Source
AI summary
A user terminal is disclosed that includes a receiver that performs sensing before signal transmission and a transmitter that transmits a Physical Uplink Shared Channel (PUSCH). In addition, the transmitter transmits predetermined information that relates to the transmission of the PUSCH. In other aspects a radio communication method for a user terminal is disclosed.