Transparency window aware sequence selection and transmission procedure for device discovery and range estimation
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.
1. A method performed by a wireless transmit/receive unit, WTRU, for initial timing synchronization to communicate with a network, the method comprising:
receiving an in-channel narrowband synchronization sequence from the network to perform initial coarse timing synchronization;
determining coarse timing offset and a range estimation between a beam source of a network transmitter and the WTRU by using the received in-channel narrowband synchronization sequence;
selecting a wideband sequence for a fine timing synchronization using the range estimation, the selected wideband sequence matching a spectral profile of the channel;
transmitting the selected wideband sequence during an uplink timing occasion to the network; and
receiving a verification of the selected wideband sequence from the network.
2. The method of claim 1 , wherein determining the coarse timing offset and the range estimation comprises determining the range estimation by examining an in-channel narrowband sequence correlation output of the received in-channel narrowband synchronization sequence.
3. The method of claim 1 , wherein selecting a wideband sequence that matches a spectral profile of the channel comprises a wideband communication channel spectral profile that describes the location of molecular absorption peaks in an operational channel.
4. The method of claim 1 , wherein receiving the selected wideband sequence from the network completes a fine timing synchronization for the WTRU.
5. The method of claim 1 , wherein selecting the wideband sequence further includes using information of a frequency span of transparency windows.
6. The method of claim 5 , wherein the information of the frequency span of transparency windows comprises location information that indicates molecular absorption frequencies and relevant range dependent losses.
7. The method of claim 1 , wherein transmitting the selected wideband sequence comprises transmitting the selected sequence after a configured offset time related to the received in-channel narrowband synchronization sequence.
8. The method of claim 1 , wherein receiving the in-channel narrowband synchronization sequence from the network occurs in sub-terahertz to terahertz frequency bands.
9. A wireless transmit/receive unit, WTRU, comprising circuitry, including a transmitter, a receiver, a processor, and memory, configured to:
receive an in-channel narrowband synchronization sequence from the network to perform initial coarse timing synchronization with the WTRU;
determine a coarse timing offset and a range estimation between a beam source of a network transmitter and the WTRU by using the received in-channel narrowband synchronization sequence;
select a wideband sequence for a fine timing synchronization using the range estimation, the selected wideband sequence matching a spectral profile of the channel;
transmit the selected wideband sequence during an uplink timing occasion to the network; and
receive a verification of the selected wideband sequence from the network.
10. The WTRU of claim 9 , the wherein the WTRU determination of the coarse timing offset and the range estimation comprises the range estimation determined by examining an in-channel narrowband sequence correlation output of the received in-channel narrowband synchronization sequence.
11. The WTRU of claim 9 , wherein the spectral profile describes locations of molecular absorption peaks in an operational channel.
12. The WTRU of claim 9 , wherein the WTRU reception of the selected wideband sequence from the network completes a fine timing synchronization for the WRTU.
13. The WTRU of claim 9 , wherein the wideband sequence is selected using information of a frequency span of transparency windows.
14. The WTRU of claim 13 , wherein the transparency window location information indicates molecular absorption frequencies and relevant range dependent losses.
15. The WTRU of claim 9 , wherein the the selected wideband sequence is transmitted after a configured offset time related to the received in-channel narrowband synchronization sequence.
16. The WTRU of claim 9 , wherein the in-channel narrowband synchronization sequence from the network occurs in sub-terahertz to terahertz frequency bands.
17. The WTRU of claim 9 , wherein the beam source of the network transmitter and a WTRU receiver are reciprocal.
18. A non-transient computer readable storage medium comprising instructions which when executed by a computer cause the computer to carry out the method of:
receiving an in-channel narrowband synchronization sequence from the network to perform initial coarse timing synchronization;
determining coarse timing offset and a range estimation between a beam source of a network transmitter and the WTRU by using the received in-channel narrowband synchronization sequence;
selecting a wideband sequence for a fine timing synchronization using the range estimation, the selected wideband sequence matching a spectral profile of the channel;
transmitting the selected wideband sequence during an uplink timing occasion to the network; and
receiving a verification of the selected wideband sequence from the network.
19. The non-transient computer readable storage medium of claim 18 , wherein determining the coarse timing offset and the range estimation comprises determining the range estimation by examining an in-channel narrowband sequence correlation output of the received in-channel narrowband synchronization sequence.
20. The non-transient computer readable storage medium of claim 18 , wherein selecting a wideband sequence that matches a spectral profile of the channel comprises a wideband communication channel spectral profile that describes the location of molecular absorption peaks in an operational channel.