SCell Timing Advance Derivation for Sub-THz UL Synchronization
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Solution Overview
Problem
In wireless communication systems utilizing sub-terahertz frequencies, obtaining a timing advance (TA) for secondary cells (SCells) via a random access channel (RACH) procedure is time-consuming and leads to increased latency and power consumption at the user equipment (UE).
Innovation Solution
A method for deriving a secondary cell (SCell) TA based on a primary cell (PCell) TA and timing offset, allowing the UE to transmit data/signals without performing a RACH procedure with the SCell.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a RACH procedure is performed to obtain TA for SCell, then timing synchronization is achieved, but latency and power consumption increase
Solution Approach 1:
The patent applies preliminary action by pre-configuring the UE with the PCell TA value before the SCell becomes active. When the SCell needs to be activated, the UE can immediately use the pre-obtained PCell TA instead of performing a new RACH procedure, thereby eliminating the latency delay associated with initial TA acquisition while maintaining timing synchronization reliability.
Solution Approach 2:
The patent uses the PCell TA as an intermediary reference value that the UE derives from the primary cell's timing information. This intermediary allows the UE to obtain SCell TA indirectly through the relationship between PCell and SCell timing offsets, avoiding the need for direct RACH procedures on the SCell and thus reducing latency while maintaining synchronization.
2Reliability
If a RACH procedure is performed to obtain TA for SCell, then timing synchronization is achieved, but power consumption increases
Solution Approach 1:
The patent applies preliminary action by pre-configuring the UE with the PCell TA value before the SCell becomes active. When the SCell needs to be activated, the UE can immediately use the pre-obtained PCell TA instead of performing a new RACH procedure, thereby eliminating the latency delay associated with initial TA acquisition while maintaining timing synchronization reliability.
Solution Approach 2:
The patent uses the PCell TA as an intermediary reference value that the UE derives from the primary cell's timing information. This intermediary allows the UE to obtain SCell TA indirectly through the relationship between PCell and SCell timing offsets, avoiding the need for direct RACH procedures on the SCell and thus reducing latency while maintaining synchronization.
3Loss of time
If PCell TA is used for SCell transmission, then latency is reduced, but timing accuracy may be compromised
Solution Approach 1:
The patent uses the PCell TA as an intermediary reference value that the UE derives from the primary cell's timing information. This intermediary allows the UE to obtain SCell TA indirectly through the relationship between PCell and SCell timing offsets, avoiding the need for direct RACH procedures on the SCell and thus reducing latency while maintaining synchronization.
Solution Approach 2:
The patent applies parameter changes by adjusting the TA value based on the frequency band differences between PCell and SCell. The UE calculates a frequency offset compensation value and applies it to the PCell TA to derive the SCell TA, ensuring timing accuracy is maintained despite using a pre-obtained TA value from a different frequency band.
Data Source
AI summary
A method of wireless communication at a UE is disclosed herein. The method includes obtaining an indication of a first TA for a PCell, where the PCell is associated with a first frequency band. The method includes estimating a timing offset between the PCell and a SCell. The method includes deriving a second TA for the SCell based on the first TA and the timing offset, where the SCell is associated with a second frequency band that is greater than the first frequency band. The method includes transmitting, for a network node, data or at least one signal via the SCell based on the second TA.