FR2 Unknown-Cell TCI Acquisition Using SSBs for SCell Activation
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Solution Overview
Problem
In wireless communication systems, the activation delay of a secondary cell (SCell) in Frequency Range 2 (FR2) is prolonged due to the lack of accurate Transmission Configuration Indicator (TCI) information for Layer 1-Reference Signal Received Power (L1-RSRP) reporting, leading to unreliable measurements and delayed activation processes.
Innovation Solution
The user equipment (UE) acquires TCI information by performing L1-RSRP measurements using detectable Synchronization Signal Blocks (SSBs) during SCell activation, reporting alternative information in the L1-RSRP measurement report when precise TCI information is unavailable, and utilizing L3 SSB measurements or preconfigured TCI information to ensure reliable beam reporting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If TCI information is not configured before SCell activation, then the network can start activation process, but the UE cannot perform reliable L1-RSRP measurements
Solution Approach 1:
The network performs preliminary L3-RSRP measurements and determines appropriate TCI states before initiating SCell activation. This preliminary action allows the UE to have TCI information available when needed for L1-RSRP measurements, resolving the contradiction between activation speed and measurement reliability.
Solution Approach 2:
L3-RSRP measurements serve as an intermediary mechanism to bridge the gap between network-side TCI determination and UE-side L1-RSRP measurement. The network uses L3 measurements to select appropriate TCI states, which then enable reliable L1 measurements at the UE without requiring pre-configuration of all possible TCI information.
2Reliability
If TCI information is configured before SCell activation, then L1-RSRP measurements can be reliable, but the TCI information may be outdated
Solution Approach 1:
The system transitions from static pre-configured TCI information to dynamic TCI determination based on current L3-RSRP measurements. The network performs measurements and determines TCI states close to the activation moment, ensuring the information remains valid and current while enabling reliable L1-RSRP measurements.
3Reliability
If the network waits for UE to detect SSBs and report before activation, then TCI information is accurate, but activation delay increases
Solution Approach 1:
The network performs L3-RSRP measurements and determines TCI states in advance, before triggering the SCell activation process. This preliminary determination of accurate TCI information eliminates the need for additional UE SSB detection and reporting steps, thereby maintaining accuracy while reducing activation delay.
Data Source
AI summary
A method and apparatus of a device that acquires transmission configuration indicator (TCI) information for secondary cell (SCell) activation. In some embodiments, the TCI information is acquired for SCell activation by determining, during secondary cell (SCell) activation, that beam information to enable a user equipment (UE) to make a reliable layer 1 (L1)-Reference Signal Received Power (RSRP) measurement report is unavailable, perform the L1-RSRP measurement using information of one or more Synchronization Signal Blocks (SSBs) during the SCell activation, wherein the one or more processors perform the L1-RSRP measurement using information of one or more SSBs during the SCell activation by identifying, by the UE, one or more detectable SSBs during the SCell activation and using information of the one or more detectable SSBs for the L1-RSRP measurement