TDD Uplink-Downlink Configuration Conflict Resolution in Carrier Aggregation Positioning
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Solution Overview
Problem
In mobile communications, the positioning accuracy is compromised due to different TDD uplink-downlink configurations in CA scenarios, where user equipment (UE) cannot simultaneously transmit and receive signals, affecting the OTDOA measurement.
Innovation Solution
A method and apparatus that determine the UE to perform PRS measurement at the same subframe location of the SCell with the same configuration, avoiding scheduling data or configuring a sounding signal at the same subframe location of the PCell and SCell with different configurations, allowing the UE to use the PRS subframe of the SCell for positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the UE performs OTDOA measurement using PRS subframes in inter-band carrier aggregation with different TDD uplink-downlink configurations, then positioning service can be provided, but positioning accuracy deteriorates because the UE cannot simultaneously transmit and receive signals
Solution Approach 1:
The network side (eNodeB) proactively identifies subframes where PCell and SCell have different TDD configurations and pre-configures the UE with alternative PRS measurement opportunities. By performing preliminary analysis of configuration conflicts and preparing alternative measurement subframes in advance, the system ensures the UE can perform accurate measurements without encountering transmission-reception conflicts during actual positioning operations.
2Productivity
If the UE receives PRS signal on SCell subframes that coincide with PCell uplink subframes, then more PRS opportunities are available for measurement, but measurement reliability deteriorates due to simultaneous transmission and reception limitations
Solution Approach 1:
The system segments the PRS measurement process by identifying and separating valid measurement subframes from invalid ones. The eNodeB analyzes the TDD configuration of both PCell and SCell, segments the SCell subframes into measurable and non-measurable groups, and directs the UE to perform measurements only on the valid segment. This segmentation ensures measurement reliability while maintaining adequate measurement opportunities through proper selection of alternative subframes.
3Productivity
If the network schedules data or sounding signals on all available subframes to maximize resource utilization, then spectral efficiency improves, but positioning accuracy deteriorates due to conflicts with PRS measurement requirements
Solution Approach 1:
The system applies local quality by treating different subframes with different scheduling qualities. Subframes identified as suitable for PRS measurement are marked with special quality attributes, preventing data or sounding signal scheduling on these specific subframes. This localized differentiation ensures that positioning-critical subframes maintain high measurement quality while other subframes continue to be used for data transmission, achieving a balance between resource utilization and positioning accuracy.
Data Source
AI summary
The present invention discloses a positioning method. When a primary cell PCell and a serving cell SCell that are of user equipment UE have different uplink-downlink configurations at a same subframe location, and the UE does not support simultaneous transmission and reception, the method includes: receiving, by a first device, positioning information of the UE, where the positioning information includes positioning assistance information, or positioning assistance information and a UE identifier, and the positioning assistance information includes at least positioning reference signal PRS information, or PRS information and a Cell ID; determining, by the first device and according to the positioning information, that the UE performs PRS measurement at the same subframe location of the SCell that has same configuration, and avoiding, by the first device, scheduling data or configuring a sounding signal sounding at the same subframe location of the PCell and the SCell that have different configurations.