Uplink Control Information Transmission via Spectrum Band Segmentation
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently transmitting uplink control information (UCI) over component carriers, particularly in scenarios where a user equipment (UE) needs to communicate using both dedicated and shared radio frequency spectrum bands, with existing methods lacking an effective scheme to prioritize reliable spectrum usage.
Innovation Solution
A method is described where a UE determines a set of uplink component carriers (UL CCs) to use, including at least one in a dedicated and one in a shared radio frequency spectrum band, and selectively limits the transmission of aperiodic channel state information (CSI) to the dedicated band while allowing its transmission over the shared band, based on availability and type of information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a UE transmits UCI over both dedicated and shared radio frequency spectrum bands, then the capacity and coverage are enhanced, but the reliability of critical control information transmission is compromised
Solution Approach 1:
The patent segments UCI into different types (periodic CSI, aperiodic CSI, ACK/NACK, SR) and assigns them to different transmission paths based on their criticality. Periodic CSI is transmitted only over dedicated spectrum for high reliability, while aperiodic CSI can be transmitted over shared spectrum to utilize additional capacity. This segmentation resolves the contradiction by ensuring critical information maintains reliability while non-critical information utilizes shared resources for enhanced capacity.
Solution Approach 2:
The patent applies different transmission qualities to different UCI types based on their local requirements. Critical UCI (periodic CSI) receives high-quality dedicated spectrum transmission, while less critical UCI (aperiodic CSI) can use lower-quality shared spectrum transmission. This local quality differentiation allows the system to optimize overall performance by matching transmission quality to information criticality.
2Reliability
If a UE prioritizes dedicated spectrum for all UCI transmission, then the reliability is improved, but the efficiency and capacity utilization deteriorate
Solution Approach 1:
The patent implements dynamic transmission path selection where the UE adaptively chooses between dedicated and shared spectrum based on real-time conditions including buffer status, channel quality, and UCI type. This dynamic approach allows the system to prioritize dedicated spectrum for critical information when needed while utilizing shared spectrum for non-critical information to maximize capacity utilization, thereby resolving the contradiction between reliability and efficiency.
Solution Approach 2:
The patent changes the transmission parameters (spectrum band selection, modulation scheme, resource allocation) based on the UCI type and channel conditions. For periodic CSI, it maintains strict use of dedicated spectrum with high-reliability parameters, while for aperiodic CSI, it allows flexible parameter changes including use of shared spectrum with potentially lower overhead. This parameter adaptation resolves the contradiction by optimizing each transmission according to its specific requirements.
3Productivity
If a UE transmits all types of UCI over shared spectrum, then the capacity utilization is improved, but the measurement precision and reliability of control information deteriorate
Solution Approach 1:
The patent segments UCI transmission into dedicated and shared spectrum paths based on information type. Periodic CSI, which requires high measurement precision for channel state feedback, is exclusively transmitted over dedicated spectrum. Aperiodic CSI, which can tolerate lower precision, is transmitted over shared spectrum to improve capacity utilization. This segmentation resolves the contradiction by matching transmission path precision requirements to information criticality.
Solution Approach 2:
The patent applies different transmission qualities to different UCI types based on their local precision requirements. Critical control information (periodic CSI) receives high-quality dedicated spectrum transmission with robust modulation and coding, while less critical information (aperiodic CSI) uses lower-quality shared spectrum transmission to maximize capacity utilization. This local quality differentiation resolves the contradiction between capacity utilization and measurement precision.
Data Source
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AI summary
Techniques are described for wireless communication. One method includes determining a set of uplink (UL) component carriers (CCs) to use for a user equipment (UE). The set of UL CCs may include at least one UL CC in a first radio frequency spectrum band and at least one UL CC in a second radio frequency spectrum band. The method further includes identifying, for a subframe, uplink control information (UCI) due for transmission, the UCI associated with one or more CCs, and limiting available UL CCs for transmission of the UCI to the at least one UL CC in the first radio frequency spectrum band.