SRS Frequency Hopping in Partial Bandwidths
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Solution Overview
Problem
In next-generation wireless communication systems, there is a need for improved methods to transmit and receive sounding reference signals (SRS) that allow for efficient frequency hopping, particularly to prevent distortion during RF retuning, especially for user equipment (UE) with limited capabilities or those requiring time for retuning.
Innovation Solution
The method involves a UE transmitting capability information to a base station (BS) for configuring SRS bandwidth and frequency start position, allowing for inter-slot or intra-slot hopping within a partial frequency bandwidth, and the BS receiving and responding with configuration information to enable SRS transmission based on the UE's capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If SRS frequency hopping is performed across the entire BWP, then measurement coverage is improved, but RF retuning distortion occurs for UEs with limited capabilities
Solution Approach 1:
The patent divides the BWP into multiple subbands and configures SRS hopping to occur within each subband rather than across the entire BWP. This segmentation allows UEs with limited RF retuning capabilities to perform frequency hopping without experiencing distortion, while still maintaining adequate measurement coverage through the distributed subband approach
Solution Approach 2:
The patent applies different hopping configurations to different subbands within the BWP. By making the hopping behavior local to each subband rather than global across the entire bandwidth, the system accommodates UE capabilities while maintaining measurement effectiveness in each local region
2Adaptability or versatility
If SRS hopping bandwidth is reduced to avoid RF retuning distortion, then UE compatibility is improved, but measurement coverage deteriorates
Solution Approach 1:
The patent segments the BWP into multiple subbands, allowing SRS hopping to be performed within each subband. This approach reduces the hopping bandwidth to levels compatible with various UE capabilities while maintaining overall measurement coverage through the collective coverage of multiple subbands
Solution Approach 2:
The patent performs frequency hopping in a partial manner across the BWP by dividing it into subbands. Rather than attempting to hop across the entire BWP which would exceed UE capabilities, the system performs partial hopping within each subband, achieving adequate measurement coverage through the aggregate effect
Data Source
AI summary
A method for transmitting an SRS by a user equipment may comprise the steps of: transmitting, to a base station, user equipment capability information including information on a frequency bandwidth where SRS frequency hopping for the user equipment is possible; receiving, from the base station, first information on an SRS bandwidth configuration and second information on the start point of an SRS frequency for transmission of an SRS; and transmitting the SRS to the base station on the basis of the first information and the second information, wherein the frequency bandwidth where SRS frequency hopping for the user equipment is possible corresponds to a partial frequency bandwidth within a bandwidth part (BWP) configured for transmission of the SRS. The UE is capable of communicating with at least one of another UE, a UE related to an autonomous driving vehicle, a base station or a network.