D2D Terminal Feedback via Shared Channel in Unlicensed Bands
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Solution Overview
Problem
In higher frequency bands, device-to-device (D2D) communications in unlicensed bands face challenges in adhering to regulatory requirements, such as performing Listen Before Talk (LBT) and maintaining channel occupancy times, which can lead to operational inefficiencies and potential interference.
Innovation Solution
A terminal is equipped with a reception unit to receive control or shared channels from another terminal in an unlicensed band, a control unit to determine whether to transmit feedback on these channels, and a transmission unit to send this feedback via a shared channel based on the determination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If D2D communication is performed in unlicensed band using conventional methods, then basic communication functionality is achieved, but regulatory compliance is poor and interference occurs
Solution Approach 1:
The patent implements feedback mechanisms where the receiving terminal sends acknowledgment signals to the transmitting terminal. This feedback loop enables adaptive adjustment of transmission parameters to comply with regulatory requirements and reduce interference in unlicensed bands
Solution Approach 2:
The patent dynamically changes transmission parameters such as power level, time slot allocation, and frequency selection based on channel conditions and regulatory requirements. This allows the system to adapt to different operational environments and maintain compliance while minimizing interference
2Reliability
If feedback is transmitted on every received channel, then communication reliability is improved, but channel occupancy time increases and regulatory compliance becomes difficult
Solution Approach 1:
The patent applies partial feedback mechanisms where feedback is transmitted selectively rather than for every received channel. This partial action approach maintains sufficient communication reliability while reducing overall channel occupancy time to meet regulatory constraints
Solution Approach 2:
The patent implements periodic feedback transmission at strategically selected intervals rather than continuous feedback. This periodic approach maintains communication reliability while creating gaps in channel occupancy that allow other transmissions and comply with regulatory requirements
3Reliability
If LBT procedure is performed before each transmission, then regulatory compliance is improved, but operational efficiency decreases due to additional time and complexity
Solution Approach 1:
The patent performs LBT procedures in advance during resource allocation phases and caches the results for subsequent transmissions. This preliminary action approach ensures regulatory compliance while reducing the frequency of LBT executions, thereby improving operational efficiency
Data Source
AI summary
A terminal including: a reception unit configured to receive a control channel or a shared channel from another terminal in an unlicensed band; a control unit configured to determine to transmit a feedback corresponding to the control channel or the shared channel to the another terminal via a shared channel; anda transmission unit configured to transmit the feedback via the shared channel depending on the determination.