Uplink Power Control for Early Time Alignment in LTM Mobility
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently managing early time alignment acquisition during layer 1/2 triggered mobility procedures, particularly in scenarios involving multiple technologies and releases, leading to suboptimal network performance and resource utilization.
Innovation Solution
A wireless device receives configuration parameters for a candidate cell, including synchronization signal block transmission power, and uses these to determine pathloss for uplink transmission power, facilitating early time alignment acquisition through layer 1/2 triggered mobility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If early time alignment acquisition is performed during layer 1/2 triggered mobility procedures, then time alignment is acquired faster, but network efficiency and resource utilization deteriorate due to suboptimal performance in multi-technology environments
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting uplink transmission power based on pathloss calculations derived from synchronization signal block (SSB) measurements. The wireless device modifies transmission parameters (power levels) according to the measured SSB power and calculated pathloss, enabling optimized time alignment acquisition that balances speed with network efficiency in multi-technology environments.
2Reliability
If uplink transmission power is optimized using pathloss calculation, then communication reliability improves, but device complexity increases due to additional configuration parameters
Solution Approach 1:
The patent implements self-service by enabling the wireless device to autonomously calculate pathloss and determine appropriate uplink transmission power based on SSB measurements. The device performs self-configuration using received configuration parameters without requiring complex external control, thereby improving communication reliability while keeping device complexity manageable through autonomous operation.
3Measurement precision
If synchronization signal block transmission power is configured, then time alignment accuracy improves, but loss of energy increases due to additional signaling overhead
Solution Approach 1:
The patent applies preliminary action by configuring synchronization signal block (SSB) transmission power in advance during cell selection or reselection procedures. This pre-configuration enables the wireless device to perform pathloss calculations and determine uplink transmission power before actual communication begins, improving time alignment accuracy while minimizing energy consumption by avoiding redundant signaling during active communication.
Data Source
AI summary
A wireless device receives, via a serving cell, one or more radio resource control (RRC) messages comprising configuration parameters of a candidate cell for a layer 1/2 triggered mobility (LTM) procedure. The configuration parameters indicate a transmission power of a synchronization signal block (SSB) transmitted via the candidate cell. The wireless device receives a physical downlink control channel (PDCCH) order comprising a cell indicator indicating the candidate cell, an SSB index indicating the SSB of SSBs of the candidate cell, and a preamble index of a preamble. The wireless device transmits, via a physical random access channel (PRACH) occasion corresponding to the SSB of the candidate cell, the preamble using an uplink transmission power based on a measurement of a pathloss. The pathloss is determined based on the transmission power of the SSB, and a layer 3 filtered reference signal received power (RSRP) of the SSB.