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WO-2026097066-A1 - DOWNLINK-COVERAGE ENHANCEMENTS CAPABILITY-BASED CELL RESELECTION IN WIRELESS SYSTEMS

WO2026097066A1WO 2026097066 A1WO2026097066 A1WO 2026097066A1WO-2026097066-A1

Abstract

Systems, methods, devices, and instrumentalities are described herein for downlink-coverage enhancements (DL-CE) capability-based cell selection or cell reselection. A wireless transmit/receive unit (WTRU) may receive system information including absolute priority information associated with non- terrestrial network (NTN) and downlink-coverage enhancements (DL-CE) capabilities. In examples, the WTRU may determine to use the absolute priority information for the WTRU based on the absolute priority information being associated with the NTN and DL-CE capabilities if the WTRU supports those capabilities. The absolute priority information may include a first absolute priority value associated with a first frequency and a second absolute priority value associated with a second frequency. Reselection may be performed by prioritizing a cell associated with the second frequency based on the determination that the second absolute priority value associated with the second frequency is greater than the first absolute priority value associated with the first frequency.

Inventors

  • KEIICHI, KUBOTA
  • MARTIN, BRIAN
  • SALIM, UMER

Assignees

  • INTERDIGITAL PATENT HOLDINGS, INC.

Dates

Publication Date
20260507
Application Date
20251104
Priority Date
20241104

Claims (20)

  1. 1 . A wireless transmit/receive unit (WTRU), comprising: a processor configured to: receive system information, wherein the system information includes at least: first absolute priority information associated with non-terrestrial network (NTN) and downlink-coverage enhancements (DL-CE) capabilities, and second absolute priority information not associated with NTN and DL-CE capabilities; determine to use the first absolute priority information for the WTRU based on at least the first absolute priority information being associated with the NTN and DL-CE capabilities, wherein the first absolute priority information includes a first absolute priority value associated with a first frequency and a second absolute priority value associated with a second frequency; perform a reselection using the first absolute priority information for the WTRU, wherein the performance of the reselection using the first absolute priority information for the WTRU comprises the processor being further configured to: determine that the second absolute priority value associated with the second frequency is greater than the first absolute priority value associated with the first frequency, based on the determination that the second absolute priority value associated with the second frequency is greater than the first absolute priority value associated with the first frequency, prioritize the second frequency, and based on the second frequency being prioritized, reselect to a cell associated with the second frequency; and transmit uplink information to the cell.
  2. 2. The WTRU of claim 1 , wherein the cell is a neighbor cell, and wherein the reselection to the neighbor cell is a reselection from a serving cell to the neighbor cell.
  3. 3. The WTRU of claim 2, wherein the neighbor cell has NTN and DL-CE capabilities.
  4. 4. The WTRU of claim 1 , wherein the system information further includes assistance information associated with the cell.
  5. 5. The WTRU of claim 4, wherein the determination to use the first absolute priority information for the WTRU is further based on the assistance information.
  6. 6. The WTRU of claim 5, wherein the assistance information includes at least one of: a state transition pattern, a synchronization signal block (SSB) periodicity, or a duty cycle associated with the state transition pattern.
  7. 7. The WTRU of claim 6, wherein the state transition pattern comprises: a completely off state and an on state; or a completely off state, a common channel only state, and an on state.
  8. 8. The WTRU of claim 6, wherein the assistance information comprises information to determine a state of the cell.
  9. 9. The WTRU of claim 1 , wherein the processor is further configured to: determine that uplink user data or an uplink control message is available for transmission, wherein the uplink information is transmitted to the cell based on the determination that the uplink user data or the uplink control message is available for transmission.
  10. 10. The WTRU of claim 1 , wherein the WTRU supports NTN and DL-CE capabilities.
  11. 11. A method associated with a wireless transmit/receive unit (WTRU), the method comprising: receiving system information, wherein the system information includes at least: first absolute priority information associated with non-terrestrial network (NTN) and downlink-coverage enhancements (DL-CE) capabilities, and second absolute priority information not associated with NTN and DL-CE capabilities; determining to use the first absolute priority information for the WTRU based on at least the first absolute priority information being associated with the NTN and DL-CE capabilities, wherein the first absolute priority information includes a first absolute priority value associated with a first frequency and a second absolute priority value associated with a second frequency; performing a reselection using the first absolute priority information for the WTRU, wherein the performance of the reselection using the first absolute priority information for the WTRU further comprises: determining that the second absolute priority value associated with the second frequency is greater than the first absolute priority value associated with the first frequency, based on the determination that the second absolute priority value associated with the second frequency is greater than the first absolute priority value associated with the first frequency, prioritizing the second frequency, and based on prioritizing the second frequency, reselecting to a cell associated with the second frequency; and transmitting uplink information to the cell.
  12. 12. The method of claim 11 , wherein the cell is a neighbor cell, and wherein the reselection to the neighbor cell is a reselection from a serving cell to the neighbor cell.
  13. 13. The method of claim 12, wherein the neighbor cell has NTN and DL-CE capabilities.
  14. 14. The method of claim 11 , wherein the system information further includes assistance information associated with the cell.
  15. 15. The method of claim 14, wherein the determination to use the first absolute priority information for the WTRU is further based on the assistance information.
  16. 16. The method of claim 15, wherein the assistance information includes at least one of: a state transition pattern, a synchronization signal block (SSB) periodicity, or a duty cycle associated with the state transition pattern.
  17. 17. The method of claim 16, wherein the state transition pattern comprises: a completely off state and an on state; or a completely off state, a common channel only state, and an on state.
  18. 18. The method of claim 16, wherein the assistance information comprises information to determine a state of the cell.
  19. 19. The method of claim 11 , further comprising: determining that uplink user data or an uplink control message is available for transmission, wherein the uplink information is transmitted to the cell based on the determination that the uplink user data or the uplink control message is available for transmission.
  20. 20. The method of claim 11 , wherein the WTRU supports NTN and DL-CE capabilities.

Description

DOWNLINK-COVERAGE ENHANCEMENTS CAPABILITY-BASED CELL RESELECTION IN WIRELESS SYSTEMS CROSS-REFERENCE TO RELATED APPLICATIONS [0001] This application claims the benefit of U.S. Non-Provisional Application No. 18/936,595, filed November 4, 2024, the contents of which is incorporated by reference herein. BACKGROUND [0002] 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 [0003] Systems, methods, devices, and instrumentalities are described herein for downlink-coverage enhancements (DL-CE) capability-based cell selection. [0004] A wireless transmit/recei ve unit (WTRU) may receive system information. The WTRU may support non-terrestrial network (NTN) and DL-CE capabilities. The system information may be received in a system information block (SIB). The system information may include first absolute priority information associated with NTN and DL-CE capabilities and second absolute priority information not associated with NTN and DL-CE capabilities. The system information may (e.g., may further) include assistance information associated with the cell. In examples, the WTRU may determine to use the first absolute priority information for the WTRU based on the first absolute priority information being associated with the NTN and DL-CE capabilities. In examples, the WTRU may determine to use the first absolute priority information for the WTRU based on (e.g., further based) on the assistance information. [0005] The assistance information may include at least one of: a state transition pattern, a synchronization signal block (SSB) periodicity, or a duty cycle associated with the state transition pattern. In examples, the state transition pattern may include a completely off state and an on state. In examples, the state transition pattern may include a completely off state, a common channel only state, and an on state. In examples, the assistance information (e.g., state transition pattern) may include information to determine a state of the cell. [0006] The first absolute priority information may include a first absolute priority value associated with a first frequency and a second absolute priority value associated with a second frequency. Reselection may be performed using the first absolute priority information for the WTRU. The reselection using the first absolute priority information for the WTRU may be performed by determining that the second absolute priority value associated with the second frequency is greater than the first absolute priority value associated with the first frequency. Based on the determination that the second absolute priority value associated with the second frequency is greater than the first absolute priority value associated with the first frequency, the second frequency may be prioritized. Reselection may be performed to a cell associated with the second frequency. Uplink information may be transmitted to the cell. The cell may be a neighbor cell. The reselection to the neighbor cell may be a reselection from a serving cell to the neighbor cell. The neighbor cell may have NTN and DL-CE capabilities. BRIEF DESCRIPTION OF THE DRAWINGS [0007] FIG. 1 A is a system diagram illustrating an example communications system in which one or more disclosed embodiments may be implemented. [0008] FIG. 1 B is a system diagram illustrating an example wireless transmit/receive unit (WTRU) that may be used within the communications system illustrated in FIG. 1 A according to an embodiment. [0009] FIG. 1 C 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. 1 A according to an embodiment. [0010] FIG. 1 D 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. 1 A according to an embodiment. [0011] FIG. 2 illustrates an example of downlink-coverage enhancements (DL-CE) capabilities-based cell selection or cell reselection. DETAILED DESCRIPTION [0012] FIG. 1A is a diagram illustrating an example communications system 100 in which one or more disclosed embodiments may be implemented. The communications system 100 may be a multiple access system that provides content, such as voice, data, video, messaging, broadcast, etc., to multiple wireless users. The communications system 100 may enable multiple wireless users to access such content through the sharing of system resources, including wireless bandwidth. For example, the communications systems 100 may employ one or more channel access methods, such as code division multiple access (CDMA), time division multiple access (TDMA), frequency division multiple access (FDMA), ortho