Frequency Hopping Control Resource Set Segmentation
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Solution Overview
Problem
Wireless communication systems lack support for single carrier waveform transmission of control information using frequency hopping within the control resource set, which limits diversity and efficiency in communication, particularly for UEs experiencing high pathloss.
Innovation Solution
The system splits the control resource set into multiple component sets across different OFDM symbols with larger subcarrier spacing, each with its own DMRS, allowing frequency and time diversity within the UE's supported bandwidth, and transmits configuration information to the UE for receiving these components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If control information is transmitted using traditional OFDMA with multiple carrier transmissions, then frequency diversity is provided by spreading control information over the coreset, but the system cannot support single carrier waveform transmission with frequency hopping within the coreset
Solution Approach 1:
The control resource set is divided into multiple component coresets, each occupying different OFDM symbols and frequency resources. This segmentation enables single carrier waveform transmission with frequency hopping while maintaining frequency diversity, as each component coreset can be transmitted on different frequency resources across time
Solution Approach 2:
The system dynamically configures multiple component coresets with flexible parameters including subcarrier spacing, cyclic prefix length, and frequency location. This dynamic configuration allows the system to adapt to different channel conditions and UE capabilities while supporting single carrier waveform transmission
2Reliability
If control information is spread over the entire coreset bandwidth, then frequency diversity is maximized, but power consumption increases for UEs monitoring the full bandwidth
Solution Approach 1:
By segmenting the coreset into multiple component coresets that can be frequency-hopped, the UE only needs to monitor a subset of frequency resources at any given time rather than the entire coreset bandwidth. This reduces power consumption while maintaining frequency diversity through the hopping pattern across component coresets
Solution Approach 2:
Each component coreset is configured with local frequency resources tailored to specific UE requirements. Edge UEs can be assigned component coresets in frequency regions with better signal quality, while reducing the monitoring bandwidth compared to the full coreset, thus improving link budget and reducing power consumption simultaneously
3Power
If control information is transmitted in a single carrier waveform, then peak-to-average power ratio is improved, but frequency diversity within the coreset is reduced without frequency hopping
Solution Approach 1:
The control resource set is segmented into multiple component coresets that are transmitted using frequency hopping. This allows single carrier waveform transmission (maintaining good PAPR) while spreading control information across multiple frequency resources over time, thereby restoring frequency diversity through the hopping mechanism across the segmented component coresets
Data Source
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AI summary
Methods, systems, and devices for wireless communication are described. A base station may identify control information to be transmitted, in a slot, to a user equipment (UE). The base station may determine a configuration for splitting a control resource set for the control information into a first component control resource set and a second component control resource set within a supported bandwidth of the UE. The first component control resource set may be frequency diverse and time diverse from the second component control resource set. The base station may transmit the configuration to the UE.