Local Oscillator Reporting for RTT Carrier Phase Positioning
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Solution Overview
Problem
Current mobile communication systems face challenges in achieving accurate carrier phase positioning due to initial phase offsets between transmitters and receivers, which affect the accuracy of positioning reference signals and sounding reference signals in 5G networks.
Innovation Solution
The method involves determining and reporting local oscillator information by user equipment and network entities to enable bi-directional carrier phase positioning, using the same local oscillator for both downlink and uplink transmissions to mitigate phase offsets, and calculating round trip time for precise positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If different local oscillators are used for downlink and uplink transmissions, then device complexity is reduced, but initial phase offsets occur between transmitters and receivers affecting positioning accuracy
Solution Approach 1:
The patent changes the parameter of oscillator configuration from separate oscillators for downlink and uplink to a shared common oscillator. This parameter change eliminates initial phase offsets between transmitter and receiver while maintaining reduced device complexity through the unified oscillator architecture.
Solution Approach 2:
The patent implements a universal oscillator that serves multiple functions - it is used for both downlink transmission and uplink reception operations. This multi-functional oscillator design eliminates the need for separate oscillators, reducing device complexity while ensuring phase coherence for accurate positioning measurements.
2Measurement precision
If a common local oscillator is used for both downlink positioning reference signal measurements and uplink sounding reference signal transmissions, then positioning accuracy is improved, but device complexity increases
Solution Approach 1:
The patent extracts the oscillator management complexity from the positioning measurement process by using a dedicated common oscillator specifically for carrier phase measurements. This separation allows the oscillator to be optimized for measurement precision while its management is handled independently, reducing the overall complexity impact on the positioning system.
Solution Approach 2:
The patent introduces a common local oscillator as an intermediary component that mediates between downlink and uplink operations. This intermediary oscillator provides a stable reference for both transmission and reception, improving carrier phase positioning accuracy while its standardized interface simplifies rather than complicates the overall system architecture.
3Device complexity
If initial phase offsets are not mitigated, then device complexity remains low, but positioning integrity deteriorates
Solution Approach 1:
The patent merges the downlink and uplink oscillator operations into a single common oscillator system. This merging eliminates the phase offset issue that would otherwise require complex compensation mechanisms, thereby maintaining low device complexity while significantly improving positioning integrity through inherent phase coherence.
Data Source
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AI summary
Systems, methods, apparatuses, and computer program products for reporting LO information for RTT carrier phase positioning. An apparatus includes at least one processor and at least one memory storing instructions that, when executed by the at least one processor, may cause the apparatus at least to determine a local oscillator in the apparatus that is used to perform at least one downlink positioning reference signal (PRS) measurement and at least one uplink sounding reference signal (SRS) transmission; and transmit local oscillator information comprising at least one identifier associated with the determined local oscillator to a first network entity.