UCI Piggybacking in Cross-Carrier Scheduling Nodes
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Solution Overview
Problem
In wireless communication systems, particularly in scenarios involving Dynamic Spectrum Sharing (DSS) and Unlicensed Spectrum, the existing mechanisms for piggybacking Uplink Control Information (UCI) onto Physical Uplink Shared Channel (PUSCH) are inefficient, as they rely on a Primary Cell (PCell) for robustness, limiting the performance when a Secondary Cell (SCell) is capable of scheduling a PCell.
Innovation Solution
A method where a first node transmits a first signal in a first cell and a second signal in a second cell, with the second cell capable of scheduling a target cell incorporating UCI, and the first cell transmitting UCI when the second cell is not capable, ensuring stable UCI performance by prioritizing the SCell with the smallest serving cell identity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the terminal preferentially chooses the PUSCH transmitted on the PCell for piggybacking the UCI, then the UCI transmission reliability is improved, but the UCI piggybacking performance is limited when the SCell is capable of scheduling the PCell
Solution Approach 1:
The patent introduces a dynamic selection mechanism for UCI piggybacking that adapts based on scheduling capability. When an SCell is capable of scheduling the PCell, the terminal dynamically switches to use the SCell's PUSCH for UCI piggybacking instead of always using the PCell. This dynamic adaptation resolves the contradiction by allowing the system to achieve both high reliability (when PCell schedules) and high productivity (when SCell schedules), optimizing UCI transmission performance based on real-time scheduling conditions.
2Adaptability or versatility
If an SCell is capable of scheduling a PCell, then the scheduling flexibility is improved, but the existing UCI piggybacking mechanism becomes inefficient
Solution Approach 1:
The patent changes the selection parameter for UCI piggybacking from a static preference for PCell to a dynamic parameter based on scheduling capability. The terminal evaluates whether the SCell can schedule the PCell and adjusts the piggybacking cell selection accordingly. This parameter change enables the system to leverage SCell scheduling flexibility while maintaining an efficient, adapted UCI piggybacking mechanism that works optimally in both PCell-self-scheduling and SCell-cross-scheduling scenarios.
Data Source
AI summary
The present disclosure provides a method and a device in a node for wireless communications. A first node transmits a first signal in a first cell, and transmits a second signal in a second cell; a serving cell identity of the first cell is a first ID, and a serving cell identity of the second cell is a second ID, the first ID being smaller than the second ID; when the second cell is capable of scheduling a target cell, the second signal comprises first UCI; when the second cell is incapable of scheduling a target cell, the first signal comprises the first UCI. By associating whether a cell can piggyback UCI with whether a cell can schedule a PCell, the present disclosure manages to optimize UCI transmitting under Cross-Carrier Scheduling, hence improving the entire system's performance.