PUSCH Frequency Hopping Mode Selection for 5G Reliability
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Solution Overview
Problem
In the fifth generation cellular system, reducing the number of antennas and RF bandwidth in wireless communication devices leads to compromised DL/UL channel coverage and reception/transmission reliability, necessitating improved methods for communication efficiency and flexibility.
Innovation Solution
Implementing frequency hopping and repetition techniques for PUSCH transmission, where the frequency offset between hops is determined based on the comparison between the initial UL BWP size and the maximum bandwidth the UE can support, as indicated by the base station, to enhance reliability and coverage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the number of antennas and RF bandwidth are reduced, then device complexity and cost are reduced, but channel coverage and communication reliability deteriorate
Solution Approach 1:
The patent applies periodic action through frequency hopping, where the transmission frequency is periodically changed between different hops. This allows the system to transmit data multiple times at different frequencies, improving reliability without requiring more antennas or bandwidth. The periodic frequency changes enable diversity gain and combat fading effects.
Solution Approach 2:
The patent changes the frequency parameter dynamically through frequency hopping. By adjusting the transmission frequency according to predefined hopping patterns and comparing BWP sizes, the system adapts to channel conditions and maintains reliable communication with reduced hardware complexity.
2Device complexity
If the number of antennas and RF bandwidth are reduced, then device complexity and cost are reduced, but channel coverage deteriorates
Solution Approach 1:
Frequency hopping provides periodic transmission opportunities at different frequencies, extending effective coverage by transmitting the same data multiple times. This periodic action ensures that at least one transmission will reach the receiver successfully, compensating for reduced antenna count and bandwidth.
Solution Approach 2:
The system performs preliminary frequency planning by comparing the initial UL BWP size with the maximum supported bandwidth to determine the frequency offset before transmission begins. This preliminary calculation ensures that frequency hopping is configured optimally for the device's capabilities, maximizing coverage with limited resources.
3Productivity
If frequency hopping is implemented with adaptive frequency offset, then communication efficiency is improved, but calculation complexity increases
Solution Approach 1:
The patent adapts the frequency offset parameter based on the comparison between initial UL BWP size and maximum supported bandwidth. This parameter change approach improves communication efficiency by optimizing frequency hop spacing for the specific device capabilities, while keeping the calculation method simple and standardized.
Solution Approach 2:
The device performs self-configuration of frequency hopping parameters by comparing its own BWP capabilities with maximum supported bandwidth. This self-service approach allows the device to autonomously determine appropriate frequency offsets without requiring complex network coordination or external configuration.
Data Source
AI summary
A method by a user equipment (UE) is described. The method includes receiving, from a base station, a random access response (RAR), wherein the RAR contains a RAR uplink (UL) grant scheduling a PUSCH transmission; and determining, for the PUSCH transmission, a frequency hopping mode from two frequency hopping modes, intra-slot frequency hopping and inter-slot frequency hopping, wherein in a first case that the PUSCH transmission is scheduled with repetitions across multi-slots, the inter-slot frequency hopping is determined for the PUSCH transmission, in a second case that the PUSCH transmission is scheduled without repetition, the intra-slot frequency hopping is determined for the PUSCH transmission.