Selective SRS Muting for UE Localization and Sensing
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Solution Overview
Problem
Existing communication systems face challenges in efficiently utilizing physical uplink shared channel (PUSCH) and uplink reference signals (such as SRS) for user equipment localization and sensing, leading to lower range and velocity resolution due to the bursty nature of PUSCH and the sparse distribution of SRS, which affects energy efficiency and performance.
Innovation Solution
A method is introduced where a subset of resources allocated for uplink reference signal transmission is muted, allowing for improved energy efficiency by reallocating the saved energy to non-muted resources, thereby enhancing the transmission power and signal-to-noise ratio of both PUSCH and SRS, thus improving UE localization and sensing performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a subset of SRS resources is muted to reallocate energy to non-muted resources, then transmission power and signal-to-noise ratio are enhanced, but the quantity of SRS resources available for localization and sensing is reduced
Solution Approach 1:
The SRS resources are segmented into muted and non-muted subsets. The network device mutes a specific subset of SRS resources (e.g., certain time-frequency resources) while keeping other subsets active. This segmentation allows concentration of transmission power on the non-muted resources, improving their signal-to-noise ratio without completely disabling SRS functionality. The segmentation enables selective enhancement of critical SRS resources for localization and sensing.
Solution Approach 2:
Different quality levels are applied to different SRS resources based on their importance for localization and sensing. The network device identifies which SRS resources are critical for UE localization and sensing performance and ensures these specific resources receive enhanced power allocation. Less critical SRS resources are muted or reduced in power. This local quality differentiation optimizes the overall system performance by focusing resources where they provide the most value.
2Measurement precision
If transmission power is increased for non-muted SRS resources to improve localization and sensing performance, then range and velocity resolution are enhanced, but energy consumption increases
Solution Approach 1:
Instead of uniformly increasing power across all SRS resources (excessive action), the network device applies partial action by selectively enhancing only the non-muted SRS resources that are critical for localization and sensing. The muted resources consume no or minimal power. This partial enhancement approach achieves the necessary measurement precision improvement while avoiding unnecessary energy consumption on redundant resources.
Solution Approach 2:
The network device dynamically changes the power allocation parameter for SRS resources based on their muting status. Non-muted resources receive higher transmission power parameters, while muted resources receive zero or reduced power. This parameter change is adapted based on the specific localization and sensing requirements, allowing optimization of the trade-off between measurement precision and energy consumption.
3Productivity
If PUSCH resources are allocated for data transmission, then data communication capability is improved, but the resources available for uplink reference signal transmission are reduced
Solution Approach 1:
The network device segments the available time-frequency resources into PUSCH resources for data transmission and SRS resources for reference signals. By carefully designing this segmentation, the system ensures that SRS resources are available in specific time-frequency locations even when PUSCH is actively transmitting data. The segmentation allows both data communication and localization/sensing functions to coexist with adequate resource allocation for each.
Solution Approach 2:
The network device utilizes different time and frequency dimensions to accommodate both PUSCH and SRS transmissions. By allocating SRS resources in specific time slots and frequency subcarriers that do not conflict with PUSCH allocations, the system maintains resources for uplink reference signals while preserving data communication capability. This dimensional separation in the time-frequency resource grid resolves the resource conflict.
Data Source
AI summary
A user equipment including means for: sending, to an access node, a message for requesting allocation of one or more physical uplink shared channel resources; receiving, from the access node, based on the sent message, information indicating resources allocated for one or more physical uplink shared channel transmissions and information indicating that a subset of a plurality of resources allocated for uplink reference signal transmission are to be muted; and sending, to the access node, one or more physical uplink shared channel transmissions using the resources allocated for the one or more physical uplink shared channel transmissions and one or more uplink reference signal transmissions using non-muted resources allocated for uplink reference signal transmission.