FR2 Secondary Cell Activation With Reduced Beam Sweeping
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Solution Overview
Problem
The existing 3GPP wireless communication standards face significant delays in secondary cell activation, particularly for unknown cells in frequency range 2 (FR2), due to multiple steps involving layer 1 and layer 3 measurements, which can be improved to enhance efficiency.
Innovation Solution
The proposed solution involves reducing the RX beam sweeping factor for FR2 unknown SCell activation by introducing a new UE capability, skipping L1-RSRP measurement, and optimizing the timing for TCI activation and CSI configuration by sending semi-persistent CSI-RS activation or RRC-based CSI configuration commands with the SCell activation command.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple steps involving layer 1 and layer 3 measurements are performed for unknown SCell activation in FR2, then measurement accuracy and reliability are improved, but activation delay increases significantly
Solution Approach 1:
The patent extracts and removes the L1-RSRP measurement step from the unknown SCell activation procedure in FR2. By taking out this specific measurement step, the patent reduces the number of operations required for activation while maintaining reliability through alternative measurement approaches, thereby directly addressing the contradiction between measurement accuracy and activation delay.
Solution Approach 2:
The patent changes the measurement parameters and procedure for unknown SCell activation. Instead of performing both L1 and L3 measurements sequentially, the patent modifies the approach to skip L1-RSRP measurement and use L3 measurements directly, changing the parameter set to reduce activation time while maintaining measurement reliability.
2Measurement precision
If RX beam sweeping is performed with traditional beam sweeping factor for FR2 unknown SCell activation, then beam selection accuracy is improved, but activation delay increases
Solution Approach 1:
The patent applies partial action by using a reduced beam sweeping factor (less than the traditional factor) for RX beam sweeping during unknown SCell activation in FR2. This partial sweeping approach is sufficient for beam selection in many cases, reducing the time required while maintaining adequate beam selection accuracy, thus resolving the contradiction between precision and time.
Solution Approach 2:
The patent introduces dynamic adjustment of the beam sweeping factor based on UE capability and activation conditions. The beam sweeping factor is not fixed but can be dynamically reduced under certain conditions, allowing the system to adapt between high precision and fast activation requirements.
3Measurement precision
If L1-RSRP measurement is performed for unknown SCell activation, then beam reporting accuracy is improved, but activation delay increases
Solution Approach 1:
The patent extracts and removes the L1-RSRP measurement step from the unknown SCell activation procedure. By taking out this specific measurement step, the patent reduces the number of operations required for activation while maintaining reliability through alternative measurement approaches, thereby directly addressing the contradiction between measurement accuracy and activation delay.
Solution Approach 2:
The patent uses L3 measurement results to substitute for or copy the functionality of L1-RSRP measurement in beam reporting. The L3 measurement provides sufficient information for beam reporting without requiring the additional L1 measurement step, thus maintaining accuracy while reducing delay.
Data Source
AI summary
This disclosure describes systems, methods, and devices for secondary cell activation. A device may decode a medium access control (MAC) control element received from a network node, the MAC control element including a request to activate a secondary cell (SCell); perform receiver beam sweeping using a beam sweeping factor less than eight in a frequency range prior to activating the SCell, the receiver beam sweeping including: automatic gain control using the beam sweeping factor; and searching for the SCell using the beam sweeping factor; encode a reference signal received power (RSRP) report to be transmitted, the RSRP report including a synchronization signal block (SSB) prior to activating the SCell; perform a channel status information measurement prior to activating the SCell; encode a report indicative of the channel status information measurement to be transmitted prior to activating the SCell; and activate the SCell.