Random Access Positioning for Idle and Inactive UEs
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
UEs in RRC idle or inactive states need to transition to RRC_CONNECTED state for positioning, causing increased power consumption and delay.
Innovation Solution
A positioning method utilizing random access processes to exchange positioning information through messages like preambles, messages 2-5, and assistance data, enabling positioning without entering RRC_CONNECTED state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If UE in RRC idle or inactive state transitions to RRC_CONNECTED state for positioning, then positioning function is achieved, but power consumption increases and positioning delay increases
Solution Approach 1:
The positioning process is segmented into two independent parts: (1) UE performs positioning measurements autonomously in RRC idle/inactive state using downlink positioning reference signals from multiple base stations, and (2) network side performs position calculation using reported measurement values. This segmentation allows UE to remain in low-power state while still achieving positioning functionality.
Solution Approach 2:
The UE performs positioning measurements in advance while in RRC idle or inactive state, before any state transition occurs. By completing the measurement phase preliminarily, the UE avoids the need to enter high-power RRC_CONNECTED state, thus reducing power consumption while ensuring positioning capability is already established.
2Reliability
If UE in RRC idle or inactive state transitions to RRC_CONNECTED state for positioning, then positioning function is achieved, but positioning delay increases
Solution Approach 1:
The positioning workflow is divided into measurement phase and calculation phase. UE completes the measurement phase autonomously in idle/inactive state by measuring downlink positioning reference signals and calculating time difference of arrival values, then reports these to the network for final position calculation. This segmentation eliminates the need for state transition, thereby reducing positioning delay.
Solution Approach 2:
The UE performs positioning measurements and calculates time difference of arrival values in advance while maintaining RRC idle or inactive state. By completing these preliminary positioning actions before any state transition, the system avoids the time-consuming state transition process and reduces overall positioning delay.
3Use of energy by moving object
If UE performs positioning measurements autonomously in RRC idle state, then power consumption is reduced, but positioning measurement capability must be maintained
Solution Approach 1:
The UE autonomously performs positioning measurements in RRC idle state by independently receiving downlink positioning reference signals from multiple base stations, calculating time difference of arrival values, and reporting results to the network. This self-service capability allows the UE to maintain positioning functionality without requiring transition to high-power connected state, thus reducing power consumption while preserving measurement capability.
Data Source
AI summary
The present disclosure discloses a positioning method and device, a terminal and a base station. The positioning method is applied to a first network device, the first network device is one of a terminal and a network side device, the positioning method includes: sending first information related to a random access process, wherein the first information includes positioning information; wherein the positioning information includes at least one of the following information: an uplink positioning reference signal, configuration information of the uplink positioning reference signal, a downlink positioning reference signal, configuration information of the downlink positioning reference signal, a positioning measurement value, a positioning calculation result or terminal position information.