US-20260129714-A1 - BEAM HOPPING FOR SATELLITE BEAMS

US20260129714A1US 20260129714 A1US20260129714 A1US 20260129714A1US-20260129714-A1

Abstract

Systems, methods, and instrumentalities are disclosed herein for enabling beam hopping for satellite beams. For example, a wireless transmit/receive unit (WTRU) may receive a synchronization signal block (SSB) using a non-terrestrial network (NTN) beam. The WTRU may receive at least one of a system information block (SIB) or a beam hopping SIB (BH-SIB). The SIB may include information associated with a set of discontinuous transmission (DTx)/discontinuous reception (DRx) configurations. The BH-SIB may indicate the set of DTx/DRx configurations. A DTx/DRx configuration from the set of DTx/DRx configurations may be associated with one or more NTN beams. The WTRU may determine the set of DTx/DRx configurations based on at least one of the SIB or the BH-SIB. The WTRU may determine an active beam DTx/DRx configuration from the set of DTx/DRx configurations. The WTRU may monitor for a downlink signal during an active time associated with the active beam DTx/DRx configuration.

Inventors

Umer Salim
Moon Il Lee
Brian Martin
Faris Alfarhan
Dylan Watts
Keiichi Kubota

Assignees

INTERDIGITAL PATENT HOLDINGS, INC.

Dates

Publication Date: 20260507
Application Date: 20241104

Claims (16)

1 . A wireless transmit/receive unit (WTRU) comprising: a processor configured to: receive a synchronization signal block (SSB) using a non-terrestrial network (NTN) beam; receive at least one of system information block (SIB) or a beam hopping SIB (BH-SIB), wherein the SIB comprises information associated with a set of discontinuous transmission (DTx)/discontinuous reception (DRx) configurations, and wherein the BH-SIB indicates the set of DTx/DRx configurations, wherein the set of DTx/DRx configurations is associated with the NTN beam; determine the set of DTx/DRx configurations based on at least one of the SIB or the BH-SIB; determine an active beam DTx/DRx configuration from the set of DTx/DRx configurations; and monitor for a downlink signal during an active time associated with the active beam DTx/DRx configuration.
2 . The WTRU of claim 1 , wherein the active beam DTx/DRx configuration is determined from the set of DTx/DRx configurations based on at least one of the set of DTx/DRx configurations, a physical cell identity (PCI), an SSB index, an SIB1, the BH-SIB, tracking area information, radio access network (RAN) notification area information, WTRU location information, a timing indication, or satellite ephemeris information.
3 . The WTRU of claim 1 , wherein the BH-SIB is a first BH-SIB, and wherein the processor is configured to: determine a validity timer associated with the first BH-SIB; determine that the validity timer has expired; and based on the determination that the validity timer has expired, transmit an uplink (UL) transmission that indicates a request for a second BH-SIB, wherein the UL transmission comprises a random access channel (RACH) message.
4 . The WTRU of claim 1 , wherein the SIB comprises at least one of SIB1 or SIB19.
5 . The WTRU of claim 1 , wherein the active beam DTx/DRx configuration is a first active beam DTx/DRx configuration, wherein the downlink signal is a first downlink signal, wherein the active time is a first active time, and wherein the processor is configured to: receive an indication to implement a DTx/DRx configuration change, wherein the indication is received using at least one of a short message, a paging, or a paging early indication (PEI); based on the indication, determine a second active beam DTx/DRx configuration from the set of DTx/DRx configurations; and monitor for a second downlink signal during a second active time associated with the second active beam DTx/DRx configuration.
6 . The WTRU of claim 5 , wherein the BH-SIB is a first BH-SIB, and wherein the second active beam DTx/DRx configuration is determined from the set of DTx/DRx configurations based on at least one of: the set of DTx/DRx configurations, a PCI, an SSB index, an SIB1, the indication to implement the DTx/DRx configuration change, a second BH-SIB, tracking area information, RAN notification area information, WTRU location information, a timing indication, the first active beam DTx/DRx configuration, or satellite ephemeris information.
7 . The WTRU of claim 1 , wherein the set of DTx/DRx configurations is determined based on at least one of a PCI, an SSB index, an SIB1, the BH-SIB, a frequency band information, or carrier information.
8 . The WTRU of claim 1 , wherein each DTx/DRx configuration from the set of DTx/DRx configurations is associated with at least one of a respective cell identity, a respective SSB index, a respective beam index, or a respective geographical area information.
9 . A method comprising: receiving a synchronization signal block (SSB) using a non-terrestrial network (NTN) beam; receiving at least one of system information block (SIB) or a beam hopping SIB (BH-SIB), wherein the SIB comprises information associated with a set of discontinuous transmission (DTx)/discontinuous reception (DRx) configurations, and wherein the BH-SIB indicates the set of DTx/DRx configurations, wherein the set of DTx/DRx configurations is associated with the NTN beam; determining the set of DTx/DRx configurations based on at least one of the SIB or the BH-SIB; determining an active beam DTx/DRx configuration from the set of DTx/DRx configurations; and monitoring for a downlink signal during an active time associated with the active beam DTx/DRx configuration.
10 . The method of claim 9 , wherein the active beam DTx/DRx configuration is determined from the set of DTx/DRx configurations based on at least one of the set of DTx/DRx configurations, a physical cell identity (PCI), an SSB index, an SIB1, the BH-SIB, tracking area information, radio access network (RAN) notification area information, WTRU location information, a timing indication, or satellite ephemeris information.
11 . The method of claim 9 , wherein the BH-SIB is a first BH-SIB, and wherein the method comprises: determining a validity timer associated with the first BH-SIB; determining that the validity timer has expired; and based on the determination that the validity timer has expired, transmitting an uplink (UL) transmission that indicates a request for a second BH-SIB, wherein the UL transmission comprises a random access channel (RACH) message.
12 . The method of claim 9 , wherein the SIB comprises at least one of SIB1 or SIB19.
13 . The method of claim 9 , wherein the active beam DTx/DRx configuration is a first active beam DTx/DRx configuration, wherein the downlink signal is a first downlink signal, wherein the active time is a first active time, and wherein the method comprises: receiving an indication to implement a DTx/DRx configuration change, wherein the indication is received using at least one of a short message, a paging, or a paging early indication (PEI); based on the indication, determining a second active beam DTx/DRx configuration from the set of DTx/DRx configurations; and monitoring for a second downlink signal during a second active time associated with the second active beam DTx/DRx configuration.
14 . The method of claim 13 , wherein the BH-SIB is a first BH-SIB, and wherein the second active beam DTx/DRx configuration is determined from the set of DTx/DRx configurations based on at least one of: the set of DTx/DRx configurations, a PCI, an SSB index, an SIB1, the indication to implement the DTx/DRx configuration change, a second BH-SIB, tracking area information, RAN notification area information, WTRU location information, a timing indication, the first active beam DTx/DRx configuration, or satellite ephemeris information.
15 . The method of claim 9 , wherein the set of DTx/DRx configurations is determined based on at least one of a PCI, an SSB index, an SIB1, the BH-SIB, a frequency band information, or carrier information.
16 . The method of claim 9 , wherein each DTx/DRx configuration from the set of DTx/DRx configurations is associated with at least one of a respective cell identity, a respective SSB index, a respective beam index, or a respective geographical area information.

Description

BACKGROUND Mobile communications using wireless communication continue to evolve. A fifth generation of mobile communication radio access technology (RAT) may be referred to as 5G new radio (NR). A previous (legacy) generation of mobile communication RAT may be, for example, fourth generation (4G) long term evolution (LTE). SUMMARY Systems, methods, and instrumentalities are disclosed herein for beam hopping for satellite beams. For example, a device, such as a wireless transmit/receive unit (WTRU), may include a processor, transceiver, and/or memory. The processor, transceiver, and/or memory may be configured to perform one or more of the following. The WTRU may receive a synchronization signal block (SSB). For example, the WTRU may receive an SSB using a non-terrestrial network (NTN) beam. The WTRU may receive at least one of a system information block (SIB) or a beam hopping SIB (BH-SIB). The SIB may be, or may include, information associated with a set of discontinuous transmission (DTx)/discontinuous reception (DRx) configurations. The SIB may be associated with SIB1 and/or SIB19. The BH-SIB may indicate a set of DTx/DRx configurations. A DTx/DRx configuration (e.g., each DTx/DRx configuration) from the set of DTx/DRx configurations may be associated with one or more NTN beams. The WTRU may determine the set of DTx/DRx configurations based on at least one of the SIB or the BH-SIB. For example, the WTRU may determine a set of DTx/DRx configurations based on at least one of a physical cell identity (PCI), an SSB index, an SIB1, the BH-SIB, a frequency band information, or carrier information. The WTRU may determine an active beam DTx/DRx configuration from the set of DTx/DRx configurations. For example, the WTRU may determine the active beam DTx/DRx configuration from the set of DTx/DRx configurations based on at least one of the set of DTx/DRx configurations, a PCI, an SSB index, an SIB1, the BH-SIB, tracking area information, radio access network (RAN) notification area information, WTRU location information, a timing indication, or satellite ephemeris information. A (e.g., each) DTx/DRx configuration from the set of DTx/DRx configurations may be associated with (e.g., may be further associated with) at least one of a respective cell identity, a respective beam index, or a respective geographical area information. The WTRU may monitor for a downlink signal during an active time associated with the active beam DTx/DRx configuration. The WTRU may determine a validity timer associated with the BH-SIB (e.g., the first BH-SIB). The WTRU may determine that the validity timer has expired. Based on the determination that the validity timer has expired, the WTRU may transmit an uplink (UL) transmission that indicates a request for another BH-SIB (e.g., the second BH-SIB). The UL transmission may be, or may include, a random access channel (RACH) message. The WTRU may receive an indication to implement a DTx/DRx configuration change. The indication may be received using at least one of a short message, a paging, and/or a paging early indication (PEI). Based on the indication, the WTRU may determine another active beam DTx/DRx configuration (e.g., a second active beam DTx/DRx configuration) from the set of DTx/DRx configurations. The WTRU may monitor for another downlink signal (e.g., a second downlink signal) during another active time (e.g., a second active time) that is associated with the second active beam DTx/DRx configuration. The WTRU may determine the second active beam DTx/DRx configuration from the set of DTx/DRx configurations based on at least one of the set of DTx/DRx configurations, a PCI, an SSB index, an SIB1, the indication to implement the DTx/DRx configuration change, a second BH-SIB, tracking area information, RAN notification area information, WTRU location information, a timing indication, the first active beam DTx/DRx configuration, or satellite ephemeris information. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1A is a system diagram illustrating an example communications system in which one or more disclosed embodiments may be implemented. FIG. 1B is a system diagram illustrating an example wireless transmit/receive unit (WTRU) that may be used within the communications system illustrated in FIG. 1A according to an embodiment. FIG. 1C is a system diagram illustrating an example radio access network (RAN) and an example core network (CN) that may be used within the communications system illustrated in FIG. 1A according to an embodiment. FIG. 1D is a system diagram illustrating a further example RAN and a further example CN that may be used within the communications system illustrated in FIG. 1A according to an embodiment. FIG. 2 illustrates an example satellite beam deployment. FIG. 3 illustrates an example flow diagram of a determination of non-terrestrial network (NTN) beam discontinuous transmission (DTx)/discontinuous reception (DRx) configuration. FIGS. 4A-D illustrate example arrangements