Downlink Control Repetition Across Bandwidth Parts
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Solution Overview
Problem
Existing wireless communication systems face challenges in ensuring reliable and efficient transmission of downlink control channels, particularly in scenarios with varying bandwidth and interference, which can lead to reduced network performance and user experience.
Innovation Solution
Implementing bandwidth part (BWP) repetition mechanisms for downlink control channels, allowing for flexible adaptation to changing network conditions and improved reliability through repeated transmissions across multiple bandwidth parts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If downlink control channels are transmitted using a single bandwidth part, then the transmission is simple and low overhead, but the reliability is reduced in scenarios with varying bandwidth and interference
Solution Approach 1:
The downlink control channel transmission is segmented across multiple bandwidth parts (BWPs) instead of using a single BWP. The network configures a set of BWPs for the UE, and control channel repetitions are distributed across these segmented bandwidth resources, improving reliability through diversity while maintaining manageable complexity through structured configuration.
Solution Approach 2:
The patent introduces a new dimension of transmission diversity by utilizing multiple bandwidth parts (frequency dimension) in addition to traditional time and spatial dimensions. This allows control channel repetitions to be transmitted across different frequency ranges, providing immunity against frequency-selective fading and interference while adding flexibility to the transmission scheme.
2Reliability
If bandwidth part repetition is implemented for downlink control channels, then reliability is improved in dynamic network environments, but the device complexity and processing overhead increase
Solution Approach 1:
The network performs preliminary configuration of multiple bandwidth parts and their parameters before control channel transmission. The UE is pre-configured with BWP sets, numerologies, and other parameters through RRC signaling, so that when control channel repetitions are received across different BWPs, the UE can efficiently process them using pre-established configuration rather than performing complex real-time adjustments.
Solution Approach 2:
The patent utilizes parameter changes across different bandwidth parts, including different numerologies (subcarrier spacing, cyclic prefix lengths), to adapt the control channel transmission to varying channel conditions. The network can select appropriate BWP parameters based on channel quality, latency requirements, and interference conditions, optimizing both reliability and processing efficiency.
Data Source
AI summary
A wireless device monitors for downlink control information (DCI) having repetitions in transmission occasions of a first bandwidth part (BWP). The wireless device receives, via a transmission occasion of the transmission occasions, a repetition of a DCI indicating a second BWP. The wireless device starts to switch, during a reference transmission occasion among the transmission occasions, from the first BWP to the second BWP.