PUSCH Repetitive Transmission with Frequency Hopping for Channel Estimation
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Solution Overview
Problem
In 5G wireless communication systems, the existing methods for uplink channel transmission face challenges in achieving optimal channel estimation and coverage, particularly in scenarios with multiple frequency resources and diverse transmission environments, which affects the overall reception performance.
Innovation Solution
The proposed method involves configuring frequency resources for uplink channels using repetitive transmission and frequency hopping techniques, where the base station and user equipment coordinate to transmit and receive physical uplink shared channels (PUSCH) with configured frequency hopping intervals, utilizing demodulation reference signals (DMRS) to enhance channel estimation and diversity gain.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If frequency hopping is performed between multiple frequency resources for PUSCH transmission, then channel diversity and coverage are improved, but channel estimation performance deteriorates due to frequency variation
Solution Approach 1:
The PUSCH transmissions are segmented into multiple repetitions, where each repetition uses a different frequency resource due to frequency hopping. This segmentation allows the system to benefit from frequency diversity across multiple resources while maintaining the ability to perform channel estimation within each repetition using DMRS
Solution Approach 2:
DMRS (demodulation reference signals) are introduced as intermediary elements embedded within each PUSCH repetition. These DMRS serve as stable reference points that enable accurate channel estimation even when the actual data transmissions occur at different frequency resources due to hopping
2Reliability
If repetitive transmission is configured for PUSCH, then uplink coverage is improved, but system complexity increases due to coordination of multiple transmissions
Solution Approach 1:
The base station is designed with multi-functionality to handle repetitive PUSCH transmissions. It can simultaneously perform frequency resource allocation, channel estimation, and data reception across multiple repetitions using a unified processing framework, reducing the perceived complexity despite the multiple transmission operations
Solution Approach 2:
Frequency hopping patterns and DMRS configurations are predetermined and configured in advance for repetitive PUSCH transmissions. This preliminary configuration simplifies the real-time processing by eliminating the need for dynamic decision-making during the actual repetitive transmission phase
Data Source
AI summary
According to an embodiment of the disclosure, a method of operating a user equipment (UE) for estimating a channel based on a physical uplink shared channel (PUSCH) transmitted repetitively may include receiving, from a base station (BS), repetitive transmission configuration information for repetitively transmitting a PUSCH; receiving, from the BS, frequency hopping configuration information including configuration information for a hopping interval between a plurality of frequency resources for transmitting the PUSCH; and repetitively transmitting the PUSCH to the BS while performing frequency hopping at the hopping interval based on the repetitive transmission configuration information and the frequency hopping configuration information.