Uplink Power Adjustment State for Reliable Handover Transmission
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Solution Overview
Problem
In wireless communication systems, particularly during RACH-less handovers in non-terrestrial networks, user equipment (UE) faces challenges in determining the appropriate power adjustment for initial uplink transmissions to a target cell, leading to potential transmission failures or power wastage due to insufficient or excessive power levels.
Innovation Solution
The UE receives an indication of an initial power adjustment state through a handover command, which can be based on the most recent power adjustment state of the source cell, and calculates the transmit power using this state and additional parameters like a configured or dynamic grant, ensuring optimal power levels for the initial transmission to the target cell.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the UE determines power adjustment autonomously during handover, then the handover procedure is fast and efficient, but the transmit power may be incorrect leading to underpower or overpower issues
Solution Approach 1:
The source base station performs preliminary action by calculating and determining the appropriate power adjustment value before the handover occurs. This pre-calculated power adjustment is then provided to the UE in the handover command, allowing the UE to use the correct power value during the actual handover without needing to determine it autonomously, thus resolving the contradiction between fast handover and reliable transmission.
2Reliability
If the UE uses higher transmit power for initial uplink transmission, then the likelihood of successful transmission is improved, but resource wastage and interference increase
Solution Approach 1:
The network provides feedback to the UE about the appropriate power adjustment value through the handover command. This feedback mechanism allows the UE to transmit with the precise power level needed for successful communication without excessive power wastage or interference to other users, resolving the contradiction between transmission reliability and energy efficiency.
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive, in accordance with a handover from a source cell to a target cell, an indication of an initial power adjustment state to be used for an initial transmission to the target cell. The UE may perform an initial transmission to the target cell in accordance with the initial power adjustment state. Numerous other aspects are described.