D2D Terminal Prioritization for Carrier Aggregation Overlap
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Solution Overview
Problem
In device-to-device (D2D) direct communication using carrier aggregation, there is a possibility that the required quality is not achieved and certain functions in the NR sidelink are not supported, especially when transmission channels overlap in the time domain across multiple carriers.
Innovation Solution
A terminal is equipped with a control unit that manages the prioritization of channels or signals and performs transmission power control or stops transmission based on this prioritization, specifically when feedback channels in one carrier overlap with channels or signals in another carrier during D2D direct communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If transmissions are performed by using a plurality of carriers in D2D communication, then communication capacity and data rate are improved, but channel overlap in time domain occurs causing transmission power control issues
Solution Approach 1:
The patent changes the parameter of transmission power allocation by introducing prioritization levels for different channel types. When channel overlap occurs in the time domain, the system adjusts transmission power parameters based on predefined priorities (e.g., feedback channels get higher priority than data channels), thereby resolving the power control complexity while maintaining multi-carrier communication capacity.
2Reliability
If carrier aggregation is applied in NR sidelink, then transmission quality is improved, but certain NR sidelink functions are not supported due to channel overlap
Solution Approach 1:
The patent segments the channel resources by assigning different priority levels to different channel types (feedback channels, data channels, control channels). This segmentation allows the system to maintain NR sidelink functions by selectively managing power allocation for each segment, ensuring that critical functions remain supported even when carrier aggregation causes channel overlap.
3Speed
If feedback channels in first carrier overlap with channels in second carrier, then simultaneous transmission capability is improved, but transmission power must be controlled which complicates the system
Solution Approach 1:
The patent implements preliminary action by pre-defining priority relationships between different channel types before transmission occurs. The system establishes a priority hierarchy (e.g., feedback channels > data channels) in advance, so when overlap occurs, the power control decision can be made automatically based on pre-established rules, reducing the operational complexity of real-time power control while maintaining high transmission speed.
Data Source
AI summary
A terminal includes: a control unit configured to perform a process related to transmission in a case where one or more of feedback channels in a first carrier overlap in at least a time domain with either a channel or a signal in a second carrier in a device to device direct communication in which carrier aggregation is applied; and a transmission unit configured to transmit at least one of: the one or more of the feedback channels; or the channel or the signal. The control unit performs prioritization regarding which channel or signal is to be prioritized, and performs at least one of controlling of transmission power or stopping of transmission, based on the prioritization.