Uplink Precoding for Frequency Hopping in Wireless Systems
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently managing frequency hopping in uplink subbands, which affects the performance and reliability of mobile communication services.
Innovation Solution
A method and device for performing frequency hopping-based uplink subband precoding in a wireless communication system, where the user equipment (UE) receives downlink control information (DCI) scheduling a physical uplink shared channel (PUSCH) transmission, and applies precoding based on a predetermined resource unit. In case of frequency hopping, a first precoding is applied for the initial frequency resource, and a second precoding is applied for the frequency-hopped resource.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If frequency hopping is applied to PUSCH transmission, then transmission reliability is improved through frequency diversity, but precoding management complexity increases due to the need to handle multiple frequency resources with different precoding configurations
Solution Approach 1:
The frequency resource for PUSCH transmission is divided into multiple subbands, with each subband assigned a specific precoding configuration. This segmentation allows the system to manage precoding on a per-subband basis rather than treating the entire frequency resource as a single unit, thereby reducing the overall complexity of precoding management while maintaining frequency diversity through frequency hopping.
Solution Approach 2:
The precoding configuration is made dynamic by associating different precoding settings with different frequency subbands and time slots. During frequency hopping, the UE dynamically switches between different precoding configurations based on the current active subband, enabling adaptive precoding that responds to channel conditions across different frequency resources without requiring complex manual configuration.
2Device complexity
If wideband precoding is used for the entire frequency resource, then device complexity is reduced, but transmission performance deteriorates due to inability to optimize precoding for specific frequency subbands
Solution Approach 1:
Instead of applying a uniform precoding configuration across the entire frequency bandwidth, the system applies different precoding configurations to different frequency subbands. This local quality approach allows each subband to be optimized according to its specific channel characteristics, improving transmission performance while keeping the overall system manageable through the use of multiple simpler subband configurations rather than one complex wideband configuration.
Data Source
AI summary
A method performed by a user equipment (UE) in a wireless communication system is provided. The method includes receiving, from a base station, downlink control information (DCI) scheduling a physical uplink shared channel (PUSCH) transmission, the DCI including information on a frequency resource for the PUSCH transmission and information indicating whether frequency hopping to be applied to the PUSCH transmission, and transmitting, to the base station, a PUSCH, based on precoding applied according to a predetermined resource unit based on the frequency resource for the PUSCH transmission, wherein, in case that the information indicating whether the frequency hopping to be applied for the PUSCH transmission indicates a value indicating that the frequency hopping is applied and the precoding is a wideband based precoding for the frequency resource for the PUSCH transmission, a first precoding is applied according to the predetermined resource unit configured to a size equal to the frequency resource for the PUSCH transmission, and for a frequency resource which is frequency hopped from the frequency resource for the PUSCH transmission, a second precoding different from the first precoding is applied according to the predetermined resource unit configured to a size equal to the frequency resource which is frequency hopped.