Power-Efficient Positioning in Wireless Idle Modes
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current 3GPP Release 16 specifications lack clear configurations and procedures for wireless communication networks to perform accurate positioning in idle or inactive modes, particularly for Industrial Internet of Things (IIoT) devices, which require high accuracy and low latency, and do not specify reference signal configurations for these modes.
Innovation Solution
The method involves configuring wireless transmit/receive units (WTRUs) to receive positioning reference signal (PRS) and sounding reference signal (SRS) configurations, allowing them to perform positioning measurements and report measurements in idle or inactive modes by selecting configurations that meet minimum accuracy requirements and data volume thresholds, and transitioning to connected mode if necessary for larger payload sizes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If WTRUs perform positioning measurements in idle or inactive modes, then power consumption is reduced, but positioning accuracy and latency may deteriorate
Solution Approach 1:
The network pre-configures positioning reference signal (PRS) and sounding reference signal (SRS) parameters, resource allocations, and measurement configurations while the WTRU is in idle or inactive mode. This preliminary configuration enables the WTRU to perform positioning measurements immediately when needed without requiring mode transition, thus reducing power consumption while maintaining positioning accuracy through pre-optimized signal parameters.
Solution Approach 2:
The system dynamically adapts positioning configurations based on WTRU state and service requirements. Different PRS/SRS configurations are prepared for different scenarios (idle, inactive, connected modes), and the appropriate configuration is activated based on current conditions. This dynamic adaptation ensures optimal positioning accuracy is achieved while minimizing power consumption by using simplified procedures in idle/inactive modes.
2Measurement precision
If WTRUs transition to connected mode for positioning measurements, then positioning accuracy is improved, but latency and power consumption increase
Solution Approach 1:
All necessary positioning configurations including PRS resource allocations, SRS parameters, measurement window timings, and reporting formats are pre-configured and stored in the WTRU before mode transition. When positioning is needed in idle or inactive mode, the WTRU can immediately perform measurements using these pre-configured parameters without the latency overhead of mode transition and configuration establishment.
3Measurement precision
If comprehensive positioning configurations are provided, then positioning accuracy is improved, but device complexity and processing overhead increase
Solution Approach 1:
Positioning configurations are segmented into multiple independent components: downlink PRS configurations (resource allocations, signal parameters, timing), uplink SRS configurations (resource allocations, modulation parameters), measurement configurations (measurement windows, reporting formats), and triggering conditions. Each component can be independently configured, activated, or modified based on specific needs, reducing overall complexity while maintaining comprehensive positioning capabilities.
Data Source
AI summary
Method, apparatus, and systems for determining and transmitting positioning information in a wireless communication network are provided. For example, a method for wireless communications comprises receiving configuration information related to a set of positioning configurations and a small data transmission (SDT), determining, based on the configuration information, that at least one positioning configuration of the set of positioning configurations satisfies a positioning requirement and is associated with a payload size being less than a data volume threshold (DVT) associated with the SDT, selecting, from the at least one positioning configuration, a positioning configuration associated with a payload size being closest to the DVT, performing a positioning measurement based on the selected positioning configuration, and sending, using an uplink resource for the SDT, a measurement report based on the selected positioning configuration and the positioning measurement.