Default Pathloss Reference Signals for Faster PUCCH SCell Activation
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Solution Overview
Problem
Existing 5G wireless communication systems face delays in activating secondary cells due to the need for additional pathloss reference signal (PL-RS) measurements during PUCCH SCell activation, which is not addressed by current 3GPP specifications.
Innovation Solution
The solution involves defining a default PL-RS for PUCCH SCell activation, allowing the reuse of existing layer 3 (L3) and layer 1 (L1) measurement results to determine uplink transmit power without additional PL-RS measurements, thereby minimizing activation delay.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If additional pathloss reference signal measurements are performed during PUCCH SCell activation, then uplink transmit power determination accuracy is improved, but activation delay increases
Solution Approach 1:
The patent applies preliminary action by performing pathloss reference signal measurements during the cell selection and reconfiguration phases before activation. The measured pathloss values are stored and reused during activation, eliminating the need for additional measurements at activation time. This allows the system to maintain accurate uplink transmit power determination while avoiding activation delay caused by new measurements.
Solution Approach 2:
The patent reuses pathloss reference signal measurements that were previously performed during cell selection and reconfiguration. By storing these measurements and applying them during SCell activation, the system avoids performing additional measurements at activation time, thus resolving the contradiction between measurement accuracy and activation speed.
2Productivity
If default pathloss reference signal is configured for PUCCH SCell activation, then activation speed is improved, but measurement reliability may deteriorate
Solution Approach 1:
The patent performs pathloss reference signal measurements in advance during cell selection and reconfiguration phases, storing the results for later use during activation. This preliminary measurement approach enables fast activation using pre-obtained reliable measurement data, resolving the contradiction between activation speed and measurement reliability.
Solution Approach 2:
The patent reuses (copies) previously obtained pathloss reference signal measurements from cell selection and reconfiguration phases for the purpose of uplink transmit power determination during activation. This copying of validated measurement data enables fast activation while maintaining reliability, as the same reliable measurements serve multiple purposes across different phases.
Data Source
AI summary
Systems, methods, apparatuses, and computer program products for determining pathloss reference signals for cell activation and compensating receive beam gain are provided. For example, a method can include selecting at least one reference signal, such as a synchronization signal block, as a default pathloss reference signal. The method can also include determining uplink transmit power for transmission by a user equipment, for example of a valid channel state information report, on a secondary cell using the selected at least one reference signal as the default pathloss reference signal.