SRS Carrier Switching for Wireless Positioning
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Solution Overview
Problem
Current wireless communication systems face interference and network congestion due to increasing demand for mobile broadband access, which degrades performance, especially in positioning accuracy when using component carriers without physical uplink shared channels and control channels.
Innovation Solution
The reuse of cross-carrier switching sounding reference signal (SRS) procedures for positioning purposes, where a base station transmits downlink control information on one component carrier to trigger the transmission of an uplink reference signal for positioning on another component carrier, allowing for accurate UE positioning without additional complexity or overhead signaling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If new signaling mechanisms are introduced for positioning on carriers without PUSCH/PUCCH, then positioning accuracy improves, but device complexity and network overhead increase
Solution Approach 1:
The patent applies universality by enabling the existing SRS carrier switching mechanism to serve dual purposes: both its original function for uplink communication and a new function for positioning. By configuring SRS resources on component carriers without PUSCH/PUCCH with positioning purposes, the system reuses established signaling structures (DCI formats, SRS resource configurations) to achieve positioning without introducing separate new signaling mechanisms, thus improving positioning accuracy while avoiding additional signaling complexity
Solution Approach 2:
The patent implements self-service by allowing the existing SRS framework to serve positioning needs through proper configuration rather than requiring external new signaling structures. The base station configures SRS resources with positioning purposes, and the UE autonomously transmits SRS on appropriate carriers based on DCI triggers, enabling the system to self-serve positioning requirements using already-deployed components
2Measurement precision
If SRS is transmitted on component carriers without PUSCH/PUCCH for positioning, then positioning accuracy improves, but network congestion and interference increase
Solution Approach 1:
The patent applies periodic action by triggering SRS transmissions for positioning through DCI messages only when needed, rather than continuous transmission. The aperiodic SRS carrier switching mechanism allows the base station to trigger positioning SRS transmissions on specific component carriers based on positioning requirements, reducing unnecessary transmissions that would cause interference and congestion while maintaining positioning accuracy when measurements are required
Solution Approach 2:
The patent implements local quality by enabling SRS transmission for positioning specifically on component carriers without PUSCH/PUCCH configurations, while leaving other carriers unchanged. This targeted approach allows positioning measurements to be performed on carriers that would otherwise be underutilized, improving overall spectrum efficiency and reducing interference on carriers dedicated to data and control transmissions
3Measurement precision
If cross-carrier SRS switching is used for positioning, then positioning accuracy improves, but loss of time due to carrier switching increases
Solution Approach 1:
The patent applies preliminary action by pre-configuring multiple SRS resources across different component carriers with positioning purposes before positioning measurements are needed. The base station provides SRS resource configurations including carrier frequencies, bandwidths, and other parameters in advance through RRC signaling, so that when a positioning measurement is required, the UE can immediately transmit on the pre-configured carrier without time-consuming setup, thus reducing carrier switching time while maintaining positioning accuracy
Data Source
AI summary
In some aspects, a method of wireless communication by a user equipment (UE) includes receiving, by the UE on a component carrier (CC), a downlink (DL) control information (DCI) that triggers transmission, by the UE on another CC, of an uplink (UL) reference signal (RS) for positioning. The method additionally includes transmitting, by the UE in response to the DCI, the UL RS for positioning on the other CC. In other aspects, a method of wireless communication by a base station includes transmitting, by the base station to a UE on a CC, a DCI that triggers transmission, by the UE on another CC, of an UL RS for positioning. The method additionally includes receiving, by the base station from the UE in response to the DCI, the UL RS for positioning on the other CC.