Synchronization Sequence Selection for THz Device Discovery and Ranging
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Solution Overview
Problem
The implementation of Terahertz bands in 5G communications faces challenges such as high path loss and antenna development, particularly in defining and establishing effective communication links.
Innovation Solution
The proposed solution involves enhancing antenna performance through techniques like aperture-stacked patch antennas, parasitic elements, and frequency band management, along with synchronization protocols and sequence transmission methods to improve signal transmission and reception in Terahertz bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If Terahertz bands are used for 5G communications, then bandwidth and frequency range are increased, but path loss increases and communication link reliability deteriorates
Solution Approach 1:
The patent segments the Terahertz frequency band into multiple sub-bands and uses multiple synchronization sequences with different cyclic shifts. Each sequence targets specific transparency windows within the band, dividing the challenging wideband transmission into manageable segments that can be individually optimized for reliability while maintaining overall high data rates
Solution Approach 2:
The patent changes the frequency parameter by selecting synchronization sequences tailored to specific transparency windows within the Terahertz band. By adapting the sequence frequency characteristics to match favorable propagation conditions, the system maintains reliable communication links despite the high path loss inherent in Terahertz frequencies
2Productivity
If synchronization sequences are transmitted continuously, then device discovery speed is improved, but energy consumption increases
Solution Approach 1:
The patent implements periodic transmission of synchronization sequences with configurable periods and cyclic shifts. Instead of continuous transmission, sequences are sent at periodic intervals, allowing the system to achieve device discovery through multiple periodic opportunities while significantly reducing energy consumption compared to continuous transmission
Solution Approach 2:
The patent transmits a set of synchronization sequences with different cyclic shifts periodically, where the number of sequences and their periodicity are optimized to achieve sufficient device discovery probability without excessive energy expenditure. The system uses just enough periodic transmissions to ensure discovery while avoiding wasteful continuous transmission
3Loss of time
If wideband sequences are transmitted at minimum delay, then synchronization speed is improved, but signal strength deteriorates due to path loss
Solution Approach 1:
The patent applies local quality by selecting synchronization sequences with specific properties matched to local channel conditions, particularly transparency windows at different distances. The system chooses sequences optimized for the specific propagation conditions and distance range, achieving both fast synchronization and adequate signal strength through localized sequence selection rather than uniform transmission
Data Source
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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.