MAC Element TCI State Switching Delay Calculation
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently managing uplink transmission configuration indicator (TCI) state switching, particularly due to uncertainties in pathloss reference signal (PL-RS) switching delays, which can impact the reliability and timing of TCI state transitions in wireless devices.
Innovation Solution
The implementation of a Medium Access Control (MAC) element-based uplink TCI state switching mechanism that calculates a TCI state switch delay time based on specific conditions, including the timing of downlink transmissions, HARQ acknowledgments, and pathloss reference signal periodicity, to ensure timely and reliable TCI state transitions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If MAC element-based TCI state switching is implemented without considering pathloss reference signal timing, then TCI state switching speed is improved, but switching reliability deteriorates due to uncertainties in PL-RS switching delays
Solution Approach 1:
The patent calculates the TCI state switch delay time in advance by considering the periodicity of pathloss reference signals and timing of downlink transmissions. This preliminary calculation ensures that the UE can switch TCI states at the correct time without uncertainty about PL-RS switching delays, thus maintaining both switching speed and reliability
2Reliability
If TCI state switching delay is calculated based on multiple conditions including PL-RS periodicity, then switching reliability is improved, but device complexity increases
Solution Approach 1:
The patent uses parameter changes to simplify the delay calculation by considering the periodicity of pathloss reference signals. By analyzing the timing relationship between downlink transmissions, HARQ acknowledgments, and PL-RS periodicity, the UE can determine the appropriate switch delay time through parameter comparison rather than complex multi-step calculations
Data Source
AI summary
This disclosure describes systems, methods, and devices for medium access control element-based transmission configuration indicator (TCI) state switching with a pathloss reference signal. A user equipment (UE) may decode a pathloss reference signal; generate a first time between a downlink transmission received from a network device and a hybrid automatic repeat request (HARQ) acknowledgement sent by the UE to the network device: generate a second time to a first pathloss reference signal transmission after a layer-1 reference signal received power (L1-RSRP) measurement: identify a periodicity of the pathloss reference signal: generate, based on the first time, the second time, and the periodicity, a TCI state switch delay time by which the UE device is to transmit an uplink signal to the network device after switching TCI states; and encode the uplink signal to transmit to the network device by the TCI state switch delay time.