Partial Frequency Sounding With Subhop Patterns for SRS Multiplexing
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Solution Overview
Problem
Existing wireless communication systems face inefficiencies in power usage and resource allocation due to full frequency sounding by UEs, limiting the number of UEs that can be configured for sounding in a given set of resources.
Innovation Solution
Implementing partial frequency sounding with frequency hopping, where UEs transmit SRS in a subhop of configured resources based on a frequency subhop pattern, allowing for repetitions across consecutive symbols to enhance reception probability and reduce signaling overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If full frequency sounding is performed by UEs, then complete channel information is obtained, but power usage increases and resource allocation efficiency decreases
Solution Approach 1:
The frequency sounding range is segmented into multiple subhops, and UEs are configured to sound only specific subhops rather than the entire frequency range. This segmentation allows the system to obtain sufficient channel information for targeted frequency resources while reducing the overall power consumption and resource usage required for full frequency sounding.
Solution Approach 2:
Instead of performing complete frequency sounding across the entire configured bandwidth, the system applies partial action by configuring UEs to sound only specific subhops within the frequency range. This partial sounding approach provides adequate channel state information for the necessary frequency resources while consuming less power and occupying fewer system resources.
2Measurement precision
If full frequency sounding is performed by UEs, then complete channel information is obtained, but the number of UEs that can be configured for sounding in given resources decreases
Solution Approach 1:
By segmenting the frequency sounding into multiple subhops and assigning different subhops to different UEs, the system enables multiple UEs to perform sounding simultaneously within the same resource blocks. This segmentation strategy increases the number of UEs that can be configured for sounding while maintaining adequate channel information quality for each UE's assigned subhops.
3Loss of energy
If partial frequency sounding with frequency hopping is implemented, then power usage and signaling overhead are reduced, but complexity of frequency subhop pattern configuration increases
Solution Approach 1:
The system manages the complexity of frequency subhop pattern configuration by parameterizing the subhop patterns through RRC configuration messages. By defining patterns using configurable parameters such as subhop offsets, frequency ranges, and hopping sequences, the system reduces the burden on UE implementation while maintaining flexible and efficient partial frequency sounding with frequency hopping.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. In a wireless communications system, a user equipment (UE) may use partial frequency sounding with different frequency subhop patterns so that a portion (which may be referred to as a subhop) of configured sounding reference signal (SRS) resources (e.g., a hop) are sounded. In some cases, a UE may receive a control message from a network entity identifying the frequency subhop pattern. In some cases, the network entity may configure a UE to transmit repetitions of the SRS in a same hop across consecutive symbols to increase a probability that the transmissions are successfully received and decoded by the network entity. As such, the network entity may configure a repetition factor for the frequency subhop pattern. In some cases, the frequency subhop pattern may introduce a frequency overlap between subhops.