Temporary Reference Signal for Fast SCell Activation
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Solution Overview
Problem
Current wireless communication systems, such as 5G NR, face delays in activating secondary cells due to the need for synchronization with SSBs, which can be lengthy and inefficient, especially when using traditional reference signals.
Innovation Solution
The introduction of a temporary reference signal (TRS), like A-TRS, allows wireless devices to initiate the activation procedure immediately, reducing activation time by using a Non-Zero Power CSI-RS, and the use of a bitmap structure in MAC CE signaling to manage trigger states for faster SCell activation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional reference signals are used for SCell activation, then the activation procedure is reliable and follows standard protocols, but the activation delay becomes lengthy and inefficient
Solution Approach 1:
The network node transmits a Temporary Reference Signal (TRS) before the actual SCell activation command. This preliminary TRS transmission allows the wireless device to perform time-frequency tracking and gain control in advance, so that when the activation command is received, the device can immediately activate the SCell without waiting for the first SSB, thereby reducing activation delay while maintaining reliability
Solution Approach 2:
A Temporary Reference Signal (TRS) is introduced as an intermediary signal between the traditional SSB and the SCell activation command. This TRS acts as a bridge that provides necessary reference information earlier than traditional methods, enabling faster activation while maintaining the reliability of standard activation procedures
2Reliability
If the WD waits for the first SSB to start the activation procedure, then the procedure follows standard protocols, but the activation time increases significantly
Solution Approach 1:
The system performs preliminary time-frequency tracking and gain control using a Temporary Reference Signal (TRS) before the actual activation procedure. This preliminary action allows the wireless device to be ready for immediate SCell activation without waiting for the first SSB, reducing activation time while maintaining standard protocol compliance
Solution Approach 2:
The patent substitutes the traditional SSB-based timing mechanism with a TRS-based preliminary tracking mechanism. Instead of waiting for the mechanical timing of SSB arrivals, the system uses TRS to establish timing and frequency references in advance, enabling faster activation while maintaining protocol compliance
Data Source
AI summary
A first network node is disclosed. The first network node is configured to communicate with a wireless device (WD) and includes processing circuitry and a radio interface in communication with the processing circuitry. The processing circuitry is configured to determine a reference signal presence message including presence information of at least one reference signal for an activation of at least one secondary cell. The presence information includes at least one index indicating a trigger state from a trigger state list. The radio interface is configured to transmit the reference signal presence message and receive a report from the WD indicating that the activation of at least one secondary cell using the at least one reference signal is complete. Methods, systems and other apparatuses are disclosed.