THz Timing Synchronization Sequence Selection Using Range Estimation
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Solution Overview
Problem
The implementation of 5G technologies in Terahertz bands faces challenges such as high path loss, antenna development, and communication link methods, particularly due to molecular absorption and the need for efficient synchronization procedures in sub-THz/THz bands.
Innovation Solution
The proposed solution involves generating an initial timing synchronization sequence using in-channel narrowband sequences to minimize molecular absorption impacts, allowing for coarse timing offset determination and range estimation, followed by the selection and transmission of wideband sequences for fine synchronization, which are verified by the network to establish accurate timing synchronization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If wideband sequences are used for fine timing synchronization, then timing precision is improved, but energy consumption increases due to higher path loss in Terahertz bands
Solution Approach 1:
The synchronization process is divided into two stages: coarse timing synchronization using narrowband sequences (lower frequency, lower path loss) and fine timing synchronization using wideband sequences (higher frequency, higher precision). This segmentation allows the system to benefit from both narrowband energy efficiency and wideband timing precision by combining them in a hierarchical approach.
Solution Approach 2:
Coarse timing synchronization is performed first using narrowband sequences to establish a preliminary timing reference and estimate range. This preliminary action reduces the search space for fine timing synchronization, allowing the system to use wideband sequences more efficiently with reduced energy consumption while achieving high precision.
2Use of energy by moving object
If narrowband sequences are used for initial synchronization, then energy consumption is reduced, but timing precision deteriorates
Solution Approach 1:
The synchronization process is divided into two stages: coarse timing synchronization using narrowband sequences (lower frequency, lower path loss) and fine timing synchronization using wideband sequences (higher frequency, higher precision). This segmentation allows the system to benefit from both narrowband energy efficiency and wideband timing precision by combining them in a hierarchical approach.
Solution Approach 2:
The patent combines narrowband and wideband sequences in a hierarchical synchronization approach. The narrowband coarse synchronization results are merged with wideband fine synchronization to achieve both energy efficiency and high timing precision, creating a composite synchronization solution that leverages the strengths of both approaches.
3Quantity of substance
If Terahertz bands are used for communication, then bandwidth is increased, but path loss worsens due to molecular absorption
Solution Approach 1:
The patent changes the frequency parameter dynamically by using narrowband sequences at lower frequencies for coarse synchronization (reducing path loss) and wideband sequences at higher frequencies for fine synchronization (increasing precision). This parameter change allows the system to adapt to the Terahertz band's high path loss characteristics while still achieving high bandwidth utilization.
Solution Approach 2:
The patent introduces range estimation as an intermediary function that uses the received signal strength and timing information to determine the distance between transmitter and receiver. This intermediary information is then used to select appropriate wideband sequences and adjust transmission parameters, mediating between the high bandwidth需求 and the high path loss challenge of Terahertz communication.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enables energy-efficient initial timing synchronization in sub-THz/THz bands by reducing molecular absorption effects and ensuring reliable communication links, even at increased distances, while maintaining low power consumption.
Implementation Method 1
The implementation of 5G technologies in Terahertz bands faces challenges such as high path loss, antenna development, and communication link methods, particularly due to molecular absorption
Implementation Method 2
transmitting the selected wideband sequence for fine timing synchronization during an uplink timing occasion, receiving from the network a transmission of the selected wideband sequence for fine timing synchronization
Data Source
AI summary
A method for initial timing synchronization for a WTRU to communicate with a network includes receiving an in-channel narrowband synchronization sequence from the network to enable initial coarse timing synchronization, determining coarse timing offset and a range between a beam source of a network transmitter and the WTRU, selecting a wideband sequence for fine timing synchronization using the estimated range, transmitting the selected wideband sequence for fine timing synchronization during an uplink timing occasion, receiving from the network a transmission of the selected wideband sequence for fine timing synchronization, and establishing fine timing synchronization between the WTRU and the network using the selected sequence.