Reference Signal Profiles for Adaptive Wireless Localization
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Solution Overview
Problem
Existing communication systems face challenges in improving localization and sensing accuracy due to the lack of task and context-specific reference signal (RS) profiles.
Innovation Solution
Implementing methods for wireless transmit and receive units (WTRUs) to send capabilities messages, receive configuration information, perform RS measurements, and report preferred characteristics and uncertainty values to enhance RS profiles for localization or sensing tasks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If task and context-specific RS profiles are implemented, then localization and sensing accuracy is improved, but device complexity and configuration overhead increase
Solution Approach 1:
The system dynamically adapts RS profile configurations based on measured channel conditions and task requirements. The WTRU performs initial measurements, determines suitable RS profiles from a set of configured profiles, and reports recommendations to the network, which then activates appropriate profiles. This dynamic adaptation enables the system to optimize localization and sensing accuracy for different channel conditions (e.g., line-of-sight vs. non-line-of-sight) and task types without requiring static preconfiguration for all scenarios.
Solution Approach 2:
The system changes key parameters of RS profiles including power allocation across frequency resources, frequency hopping patterns, and time-domain configurations. By adjusting these parameters based on channel measurements and task requirements, the system optimizes measurement accuracy for different scenarios while managing complexity through parameterized profile definitions rather than completely custom configurations.
2Adaptability or versatility
If multiple RS profiles with different characteristics are configured, then adaptability to different channel conditions is improved, but the quantity of configuration data increases
Solution Approach 1:
Different RS profiles are configured with locally optimized characteristics suited for specific channel conditions and task types. For example, certain profiles have power concentrated on specific frequency resources for line-of-sight conditions, while others use frequency hopping patterns for non-line-of-sight conditions. This local optimization within profiles allows the system to adapt to different conditions without requiring a single comprehensive configuration that covers all scenarios equally.
Solution Approach 2:
The RS configuration is segmented into multiple discrete profiles, each optimized for specific conditions. Rather than using a single monolithic configuration, the system divides the configuration space into separate profiles that can be independently selected and activated based on current channel conditions and task requirements, making the overall system more manageable despite the diversity of configurations.
3Measurement precision
If WTRU performs measurements and reports preferred RS profiles, then measurement performance is improved, but signaling overhead increases
Solution Approach 1:
The WTRU performs measurements on initially configured RS profiles and provides feedback to the network about which profiles are most suitable for current conditions. This feedback mechanism enables the network to make informed decisions about which RS profiles to activate and configure, improving measurement performance while managing signaling overhead through selective reporting rather than exhaustive configuration exchange.
Data Source
AI summary
Methods and systems are provided for a wireless transmit/receive unit (WTRU). A WTRU sends a capabilities message to a wireless network, receives configuration information for a localization or sensing task, wherein the configuration information comprises a reference signal (RS) reporting trigger, performs a first localization or sensing measurement of a first received RS based on the configuration information, determines whether the RS reporting trigger is satisfied based on the first measurement, reports, based on the RS reporting trigger being satisfied, one or more preferred characteristics of a second RS based on the first localization or sensing measurement to the network, receives an indication to perform a second localization or sensing measurement of a second received RS and performs a second localization or sensing measurement of the second received RS, reports the second localization or sensing measurement and an uncertainty value associated with the second localization or sensing measurement.