WO2026002402A1 - Procédé pour améliorer la mobilité pour déploiement de mrss - Google Patents

Procédé pour améliorer la mobilité pour déploiement de mrss

Info

Publication number
WO2026002402A1
WO2026002402A1 PCT/EP2024/068356 EP2024068356W WO2026002402A1 WO 2026002402 A1 WO2026002402 A1 WO 2026002402A1 EP 2024068356 W EP2024068356 W EP 2024068356W WO 2026002402 A1 WO2026002402 A1 WO 2026002402A1
Authority
WO
WIPO (PCT)
Prior art keywords
access technology
radio access
network node
user equipment
inter
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
PCT/EP2024/068356
Other languages
English (en)
Inventor
Mohamad SAYED HASSAN
Iman HMEDOUSH
Matha DEGHEL
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nokia Technologies Oy
Original Assignee
Nokia Technologies Oy
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nokia Technologies Oy filed Critical Nokia Technologies Oy
Priority to PCT/EP2024/068356 priority Critical patent/WO2026002402A1/fr
Publication of WO2026002402A1 publication Critical patent/WO2026002402A1/fr
Pending legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/14—Reselecting a network or an air interface
    • H04W36/144—Reselecting a network or an air interface over a different radio air interface technology
    • H04W36/1443—Reselecting a network or an air interface over a different radio air interface technology between licensed networks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0055—Transmission or use of information for re-establishing the radio link
    • H04W36/0072—Transmission or use of information for re-establishing the radio link of resource information of target access point
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0055—Transmission or use of information for re-establishing the radio link
    • H04W36/0077—Transmission or use of information for re-establishing the radio link of access information of target access point
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements
    • H04W56/004—Synchronisation arrangements compensating for timing error of reception due to propagation delay
    • H04W56/0045—Synchronisation arrangements compensating for timing error of reception due to propagation delay compensating for timing error by altering transmission time

Definitions

  • An example embodiment relates generally to multi-random access technology (RAT) spectrum sharing (MRSS), and, more particularly, to performing an MRSS multi-RAT handover (HO).
  • RAT multi-random access technology
  • HO multi-RAT handover
  • MRSS allows new radio (NR) and 6G cells to share the same carriers dynamically adapting to traffic requirements.
  • NR new radio
  • 6G cells may move between a 6G cell and a 5G cell.
  • a user equipment (110) including at least one processor and at least one memory storing instructions thereon that, when executed by the at least one processor, cause the user equipment (110) to receive (508), from a first network node (112), an indication (508a) of an inter-radio access technology handover (inter-RAT HO) from the first network node (112) of a first radio access technology to a second network node (114) of a second radio access technology, wherein the first radio access technology is different from the second radio access technology, and wherein the indication indicates that multi-radio access technology spectrum sharing (MRSS) inter-radio access technology handover is applied (508a).
  • inter-RAT HO inter-radio access technology handover
  • MRSS multi-radio access technology spectrum sharing
  • the user equipment (110) is further caused to perform an access to the second network node via at least one or both of: a random access channel-less procedure (520) or maintaining an uplink (UL) timing adjustment during the inter-radio access technology handover procedure, when it is determined that the received indication (508a) indicates that the user equipment is to apply the multi-radio access technology spectrum sharing (MRSS) inter-radio access technology handover.
  • a random access channel-less procedure 520
  • UL uplink
  • a first network node (112) including at least one processor and at least one memory storing instructions thereon that, when executed by the at least one processor, cause the first network node (112) to transmit (504), to a second network node (114), a handover request (504a) including an indication (508a) to apply a multi-radio access technology spectrum sharing (MRSS) inter-radio access technology handover, wherein the handover request (504a) indicates whether a new cell radio network temporary identifier (C- RNTI) (506b) is needed, and wherein the multi-radio access technology spectrum sharing (MRSS) inter-radio access technology handover takes place between the first network node (112) of a first radio access technology and the second network node (114) of a second radio access technology, wherein the first radio access technology is different from the second radio access technology.
  • MRSS multi-radio access technology spectrum sharing
  • the first network node (112) is further caused to transmit (508), to a user equipment (110), the indication (508a) to apply the multi-radio access technology spectrum sharing (MRSS) inter-radio access technology handover, wherein the indication further indicates to perform an initial access to the second network node via at least one or both of: a random access channelless procedure (520) or maintaining an uplink (UL) timing adjustment during the inter-radio access technology handover procedure.
  • the first network node (112) is further caused to transmit (510), to the user equipment (110), a resources configuration (510a) that schedules resources (512a/512b) to be received by the user equipment from one of: the first network node (112) or the second network node (114).
  • a user equipment (110) includes means for receiving (508), from a first network node (112), an indication (508a) of an inter-radio access technology handover (inter-RAT HO) from the first network node (112) of a first radio access technology to a second network node (114) of a second radio access technology, wherein the first radio access technology is different from the second radio access technology, and wherein the indication indicates that multi-radio access technology spectrum sharing (MRSS) inter-radio access technology handover is applied (508a).
  • inter-RAT HO inter-radio access technology handover
  • MRSS multi-radio access technology spectrum sharing
  • the user equipment (110) further includes means for performing an access to the second network node via at least one or both of: a random access channel-less procedure (520) or maintaining an uplink (UL) timing adjustment during the interradio access technology handover procedure, when it is determined that the received indication (508a) indicates that the user equipment is to apply the multi-radio access technology spectrum sharing (MRSS) inter-radio access technology handover.
  • a random access channel-less procedure 520
  • UL uplink
  • a first network node (112) includes means for transmitting (504), to a second network node (114), a handover request (504a) including an indication (508a) to apply a multi-radio access technology spectrum sharing (MRSS) inter-radio access technology handover, wherein the handover request (504a) indicates whether a new cell radio network temporary identifier (C-RNU) (506b) is needed, and wherein the multi- radio access technology spectrum sharing (MRSS) inter-radio access technology handover takes place between the first network node (112) of a first radio access technology and the second network node (114) of a second radio access technology, wherein the first radio access technology is different from the second radio access technology.
  • MRSS multi-radio access technology spectrum sharing
  • the first network node (112) further includes means for transmitting (508), to a user equipment (110), the indication (508a) to apply the multiradio access technology spectrum sharing (MRSS) inter-radio access technology handover, wherein the indication further indicates to perform an initial access to the second network node via at least one or both of: a random access channel-less procedure (520) or maintaining an uplink (UL) timing adjustment during the inter- radio access technology handover procedure.
  • the first network node (112) further includes means for transmitting (510), to the user equipment (110), a resources configuration (510a) that schedules resources (512a/512b) to be received by the user equipment from one of: the first network node (112) or the second network node (114).
  • a computer-implemented method is performed by a user equipment (110) and includes receiving (508), from a first network node (112), an indication (508a) of an inter-radio access technology handover (inter-RAT HO) from the first network node (112) of a first radio access technology to a second network node (114) of a second radio access technology, wherein the first radio access technology is different from the second radio access technology, and wherein the indication indicates that multi-radio access technology spectrum sharing (MRSS) inter-radio access technology handover is applied (508a).
  • inter-RAT HO inter-radio access technology handover
  • MRSS multi-radio access technology spectrum sharing
  • the method includes means for performing an access to the second network node via at least one or both of: a random access channel-less procedure (520) or maintaining an uplink (UL) timing adjustment during the inter-radio access technology handover procedure, when it is determined that the received indication (508a) indicates that the user equipment is to apply the multi-radio access technology spectrum sharing (MRSS) inter-radio access technology handover.
  • a random access channel-less procedure 520
  • UL uplink
  • a computer-implemented method is performed by a first network node (112) and includes transmitting (504), to a second network node (114), a handover request (504a) including an indication (508a) to apply a multi-radio access technology spectrum sharing (MRSS) inter-radio access technology handover, wherein the handover request (504a) indicates whether a new cell radio network temporary identifier (C- RNTI) (506b) is needed, and wherein the multi-radio access technology spectrum sharing (MRSS) inter-radio access technology handover takes place between the first network node (112) of a first radio access technology and the second network node (114) of a second radio access technology, wherein the first radio access technology is different from the second radio access technology.
  • MRSS multi-radio access technology spectrum sharing
  • the method further includes transmitting (508), to a user equipment (110), the indication (508a) to apply the multi-radio access technology spectrum sharing (MRSS) interradio access technology handover, wherein the indication further indicates to perform an initial access to the second network node via at least one or both of: a random access channel-less procedure (520) or maintaining an uplink (UL) timing adjustment during the inter-radio access technology handover procedure.
  • the method further includes transmitting (510), to the user equipment (110), a resources configuration (510a) that schedules resources (512a/512b) to be received by the user equipment from one of: the first network node (112) or the second network node (114).
  • a non-transitory computer readable storage medium including computer instructions that, when executed by a user equipment (110), cause the user equipment (110) to receive (508), from a first network node (112), an indication (508a) of an inter-radio access technology handover (inter-RAT HO) from the first network node (112) of a first radio access technology to a second network node (114) of a second radio access technology, wherein the first radio access technology is different from the second radio access technology, and wherein the indication indicates that multi-radio access technology spectrum sharing (MRSS) inter-radio access technology handover is applied (508a).
  • MRSS multi-radio access technology spectrum sharing
  • the user equipment (110) is further caused to perform an access to the second network node via at least one or both of: a random access channel-less procedure (520) or maintaining an uplink (UL) timing adjustment during the inter-radio access technology handover procedure, when it is determined that the received indication (508a) indicates that the user equipment is to apply the multi-radio access technology spectrum sharing (MRSS) inter-radio access technology handover.
  • a random access channel-less procedure 520
  • UL uplink
  • a non-transitory computer readable storage medium including computer instructions that, when executed by a first network node (112), cause the first network node (112) to transmit (504), to a second network node (114), a handover request (504a) including an indication (508a) to apply a multi- radio access technology spectrum sharing (MRSS) inter-radio access technology handover, wherein the handover request (504a) indicates whether a new cell radio network temporary identifier (C-RNU) (506b) is needed, and wherein the multi-radio access technology spectrum sharing (MRSS) inter-radio access technology handover takes place between the first network node (112) of a first radio access technology and the second network node (114) of a second radio access technology, wherein the first radio access technology is different from the second radio access technology.
  • MRSS multi- radio access technology spectrum sharing
  • the first network node (112) is further caused to transmit (508), to a user equipment (110), the indication (508a) to apply the multi -radio access technology spectrum sharing (MRSS) inter-radio access technology handover, wherein the indication further indicates to perform an initial access to the second network node via at least one or both of: a random access channel-less procedure (520) or maintaining an uplink (UL) timing adjustment during the inter-radio access technology handover procedure.
  • the first network node (112) is further caused to transmit (510), to the user equipment (110), a resources configuration (510a) that schedules resources (512a/512b) to be received by the user equipment from one of: the first network node (112) or the second network node (114).
  • a user equipment including at least one processor and at least one memory storing instructions thereon that, when executed by the at least one processor, cause the user equipment (110) to receive (508), from a first network node (112), an indication (508a) of an inter-radio access technology handover (inter-RAT HO) from the first network node (112) of a first radio access technology to a second network node (114) of a second radio access technology, wherein the first radio access technology is different from the second radio access technology, and wherein the indication (508a) indicates that multi-radio access technology spectrum sharing (MRSS) inter-radio access technology handover is applied.
  • inter-RAT HO inter-radio access technology handover
  • MRSS multi-radio access technology spectrum sharing
  • the user equipment (110) is further caused to receive (510), from the first network node (112), a resources configuration (510a) that schedules resources (512a/512b) to be received from one of: the first network node (112) or the second network node (114).
  • the user equipment (110) is further caused to perform the multi-radio access technology spectrum sharing (MRSS) interradio access technology handover based on the indication and the scheduled resources (PDSCH) (512a/512b).
  • MRSS multi-radio access technology spectrum sharing
  • a first network node (112) including at least one processor and at least one memory storing instructions thereon that, when executed by the at least one processor, cause the first network node (112) to transmit (504), to a second network node (114), a handover request (504a) including an indication (508a) to apply a multi-radio access technology spectrum sharing (MRSS) inter-radio access technology handover, wherein the handover request (504a) indicates whether a new cell radio network temporary identifier (C- RNTI) (506b) is needed, and wherein the multi-radio access technology spectrum sharing (MRSS) inter-radio access technology handover takes place between the first network node (112) of a first radio access technology and the second network node (114) of a second radio access technology, wherein the first radio access technology is different from the second radio access technology.
  • MRSS multi-radio access technology spectrum sharing
  • the first network node (112) is further caused to transmit (508), to a user equipment (110), the indication (508a) to apply the multi-radio access technology spectrum sharing (MRSS) inter-radio access technology handover.
  • the first network node (112) is further caused to transmit (510), to the user equipment (110), a resources configuration (510a) that schedules resources (512a/512b) to be received by the user equipment from one of: the first network node (112) or the second network node (114).
  • MRSS multi-radio access technology spectrum sharing
  • a user equipment (110) including means for receiving (508), from a first network node (112), an indication (508a) of an inter-radio access technology handover (inter-RAT HO) from the first network node (112) of a first radio access technology to a second network node (114) of a second radio access technology, wherein the first radio access technology is different from the second radio access technology, and wherein the indication (508a) indicates that multi- radio access technology spectrum sharing (MRSS) interradio access technology handover is applied.
  • inter-RAT HO inter-radio access technology handover
  • MRSS multi- radio access technology spectrum sharing
  • the user equipment (110) further includes means for receiving (510), from the first network node (112), a resources configuration (510a) that schedules resources (512a/512b) to be received from one of: the first network node (112) or the second network node (114).
  • the user equipment (110) further includes means for performing the multi-radio access technology spectrum sharing (MRSS) inter-radio access technology handover based on the indication and the scheduled resources (PDSCH) (512a/512b).
  • MRSS multi-radio access technology spectrum sharing
  • a first network node (112) including means for transmitting (504), to a second network node (114), a handover request (504a) including an indication (508a) to apply a multi-radio access technology spectrum sharing (MRSS) inter-radio access technology handover, wherein the handover request (504a) indicates whether a new cell radio network temporary identifier (C-RNU) (506b) is needed, and wherein the multi-radio access technology spectrum sharing (MRSS) inter-radio access technology handover takes place between the first network node (112) of a first radio access technology and the second network node (114) of a second radio access technology, wherein the first radio access technology is different from the second radio access technology.
  • MRSS multi-radio access technology spectrum sharing
  • the first network node (112) further includes means for transmitting (508), to a user equipment (110), the indication (508a) to apply the multiradio access technology spectrum sharing (MRSS) inter-radio access technology handover.
  • the first network node (112) further includes means for transmitting (510), to the user equipment (110), a resources configuration (510a) that schedules resources (512a/512b) to be received by the user equipment from one of: the first network node (112) or the second network node (114).
  • a computer-implemented method is performed by a user equipment (110) and includes receiving (508), from a first network node (112), an indication (508a) of an inter-radio access technology handover (inter-RAT HO) from the first network node (112) of a first radio access technology to a second network node (114) of a second radio access technology, wherein the first radio access technology is different from the second radio access technology, and wherein the indication (508a) indicates that multi-radio access technology spectrum sharing (MRSS) inter-radio access technology handover is applied.
  • inter-RAT HO inter-radio access technology handover
  • MRSS multi-radio access technology spectrum sharing
  • the method further includes receiving (510), from the first network node (112), a resources configuration (510a) that schedules resources (512a/512b) to be received from one of: the first network node (112) or the second network node (114).
  • the method further includes performing the multi-radio access technology spectrum sharing (MRSS) inter- radio access technology handover based on the indication and the scheduled resources (PDSCH) (512a/512b).
  • MRSS multi-radio access technology spectrum sharing
  • a computer-implemented method is performed by a first network node (112) and includes transmitting (504), to a second network node (114), a handover request (504a) including an indication (508a) to apply a multi-radio access technology spectrum sharing (MRSS) inter-radio access technology handover, wherein the handover request (504a) indicates whether a new cell radio network temporary identifier (C- RNTI) (506b) is needed, and wherein the multi-radio access technology spectrum sharing (MRSS) inter-radio access technology handover takes place between the first network node (112) of a first radio access technology and the second network node (114) of a second radio access technology, wherein the first radio access technology is different from the second radio access technology.
  • MRSS multi-radio access technology spectrum sharing
  • the method further includes transmitting (508), to a user equipment (110), the indication (508a) to apply the multi-radio access technology spectrum sharing (MRSS) interradio access technology handover.
  • the method further includes transmitting (510), to the user equipment (110), a resources configuration (510a) that schedules resources (512a/512b) to be received by the user equipment from one of: the first network node (112) or the second network node (114).
  • MRSS multi-radio access technology spectrum sharing
  • a non-transitory computer readable storage medium including computer instructions that, when executed by a user equipment (110), cause the user equipment (110) to receive (508), from a first network node (112), an indication (508a) of an inter-radio access technology handover (inter-RAT HO) from the first network node (112) of a first radio access technology to a second network node (114) of a second radio access technology, wherein the first radio access technology is different from the second radio access technology, and wherein the indication (508a) indicates that multi-radio access technology spectrum sharing (MRSS) inter- radio access technology handover is applied.
  • MRSS multi-radio access technology spectrum sharing
  • the user equipment (110) is further caused to receive (510), from the first network node (112), a resources configuration (510a) that schedules resources (512a/512b) to be received from one of: the first network node (112) or the second network node (114).
  • the user equipment (110) is further caused to perform the multi- radio access technology spectrum sharing (MRSS) inter- radio access technology handover based on the indication and the scheduled resources (PDSCH) (512a/512b).
  • MRSS multi- radio access technology spectrum sharing
  • a non-transitory computer readable storage medium including computer instructions that, when executed by a first network node (112), cause the first network node (112) to transmit (504), to a second network node (114), a handover request (504a) including an indication (508a) to apply a multi-radio access technology spectrum sharing (MRSS) inter-radio access technology handover, wherein the handover request (504a) indicates whether a new cell radio network temporary identifier (C-RNU) (506b) is needed, and wherein the multi-radio access technology spectrum sharing (MRSS) inter-radio access technology handover takes place between the first network node (112) of a first radio access technology and the second network node (114) of a second radio access technology, wherein the first radio access technology is different from the second radio access technology.
  • MRSS multi-radio access technology spectrum sharing
  • the first network node (112) is further caused to transmit (508), to a user equipment (110), the indication (508a) to apply the multi -radio access technology spectrum sharing (MRSS) inter-radio access technology handover.
  • the first network node (112) is further caused to transmit (510), to the user equipment (110), a resources configuration (510a) that schedules resources (512a/512b) to be received by the user equipment from one of: the first network node (112) or the second network node (114).
  • MRSS multi -radio access technology spectrum sharing
  • a user equipment (110) including at least one processor and at least one memory storing instructions thereon that, when executed by the at least one processor, cause the user equipment (110) to receive (508), from a first network node (112), an indication (508a) of an inter-radio access technology handover (inter-RAT HO) from the first network node (112) of a first radio access technology to a second network node (114) of a second radio access technology, wherein the first radio access technology is different from the second radio access technology, and wherein the indication (508a) indicates that multi-radio access technology spectrum sharing (MRSS) inter-radio access technology handover is applied.
  • inter-RAT HO inter-radio access technology handover
  • MRSS multi-radio access technology spectrum sharing
  • the user equipment (110) is further caused to apply time and/or frequency synchronization values of the first radio access technology of the first network node to the second network node during the multi-radio access technology spectrum sharing (MRSS) inter-radio access technology handover, when it is determined that the received indication (508a) indicates that the user equipment (110) is to apply time and/or frequency synchronization values (518) from the first network node (112) of the first radio access technology to the second network node (114) of the second radio access technology.
  • MRSS multi-radio access technology spectrum sharing
  • a first network node (112) including at least one processor and at least one memory storing instructions thereon that, when executed by the at least one processor, cause the first network node (112) to transmit (504), to a second network node (114), a handover request (504a) including an indication (508a) to apply a multi-radio access technology spectrum sharing (MRSS) inter-radio access technology handover, wherein the handover request (504a) indicates whether a new cell radio network temporary identifier (C- RNTI) (506b) is needed, and wherein the multi-radio access technology spectrum sharing (MRSS) inter-radio access technology handover takes place between the first network node (112) of a first radio access technology and the second network node (114) of a second radio access technology, wherein the first radio access technology is different from the second radio access technology.
  • MRSS multi-radio access technology spectrum sharing
  • the first network node (112) is further caused to transmit (508), to a user equipment (110), the indication (508a) to apply the multi-radio access technology spectrum sharing (MRSS) inter-radio access technology handover, wherein the indication (508a) further indicates that the user equipment (110) is to apply time and/or frequency synchronization values (518) from the first network node (112) of the first radio access technology to the second network node (114) of the second radio access technology.
  • the first network node (112) is further caused to transmit (510), to the user equipment (110), a resources configuration (510a) that schedules resources (512a/512b) to be received by the user equipment from one of: the first network node (112) or the second network node (114).
  • a user equipment (110) includes means for receiving (508), from a first network node (112), an indication (508a) of an inter-radio access technology handover (inter-RAT HO) from the first network node (112) of a first radio access technology to a second network node (114) of a second radio access technology, wherein the first radio access technology is different from the second radio access technology, and wherein the indication (508a) indicates that multi- radio access technology spectrum sharing (MRSS) interradio access technology handover is applied.
  • inter-RAT HO inter-radio access technology handover
  • MRSS multi- radio access technology spectrum sharing
  • the user equipment (110) further includes means for applying time and/or frequency synchronization values of the first radio access technology of the first network node to the second network node during the multi-radio access technology spectrum sharing (MRSS) inter- radio access technology handover, when it is determined that the received indication (508a) indicates that the user equipment (110) is to apply time and/or frequency synchronization values (518) from the first network node (112) of the first radio access technology to the second network node (114) of the second radio access technology.
  • MRSS multi-radio access technology spectrum sharing
  • a first network node (112) includes means for transmitting (504), to a second network node (114), a handover request (504a) including an indication (508a) to apply a multi-radio access technology spectrum sharing (MRSS) inter-radio access technology handover, wherein the handover request (504a) indicates whether a new cell radio network temporary identifier (C-RNU) (506b) is needed, and wherein the multi- radio access technology spectrum sharing (MRSS) inter-radio access technology handover takes place between the first network node (112) of a first radio access technology and the second network node (114) of a second radio access technology, wherein the first radio access technology is different from the second radio access technology.
  • MRSS multi-radio access technology spectrum sharing
  • the first network node (112) further includes means for transmitting (508), to a user equipment (110), the indication (508a) to apply the multiradio access technology spectrum sharing (MRSS) inter-radio access technology handover, wherein the indication (508a) further indicates that the user equipment (110) is to apply time and/or frequency synchronization values (518) from the first network node (112) of the first radio access technology to the second network node (114) of the second radio access technology.
  • the first network node (112) further includes means for transmitting (510), to the user equipment (110), a resources configuration (510a) that schedules resources (512a/512b) to be received by the user equipment from one of: the first network node (112) or the second network node (114).
  • computer-implemented method is performed by a user equipment (110) and includes receiving (508), from a first network node (112), an indication (508a) of an inter-radio access technology handover (inter-RAT HO) from the first network node (112) of a first radio access technology to a second network node (114) of a second radio access technology, wherein the first radio access technology is different from the second radio access technology, and wherein the indication (508a) indicates that multi-radio access technology spectrum sharing (MRSS) inter-radio access technology handover is applied.
  • inter-RAT HO inter-radio access technology handover
  • MRSS multi-radio access technology spectrum sharing
  • the method further includes applying time and/or frequency synchronization values of the first radio access technology of the first network node to the second network node during the multiradio access technology spectrum sharing (MRSS) inter-radio access technology handover, when it is determined that the received indication (508a) indicates that the user equipment (110) is to apply time and/or frequency synchronization values (518) from the first network node (112) of the first radio access technology to the second network node (114) of the second radio access technology.
  • MRSS multiradio access technology spectrum sharing
  • a computer-implemented method is performed by a first network node (112) and includes transmitting (504), to a second network node (114), a handover request (504a) including an indication (508a) to apply a multi-radio access technology spectrum sharing (MRSS) inter-radio access technology handover, wherein the handover request (504a) indicates whether a new cell radio network temporary identifier (C- RNTI) (506b) is needed, and wherein the multi-radio access technology spectrum sharing (MRSS) inter-radio access technology handover takes place between the first network node (112) of a first radio access technology and the second network node (114) of a second radio access technology, wherein the first radio access technology is different from the second radio access technology.
  • MRSS multi-radio access technology spectrum sharing
  • the method further includes transmitting (508), to a user equipment (110), the indication (508a) to apply the multi-radio access technology spectrum sharing (MRSS) interradio access technology handover, wherein the indication (508a) further indicates that the user equipment (110) is to apply time and/or frequency synchronization values (518) from the first network node (112) of the first radio access technology to the second network node (114) of the second radio access technology.
  • the method further includes transmitting (510), to the user equipment (110), a resources configuration (510a) that schedules resources (512a/512b) to be received by the user equipment from one of: the first network node (112) or the second network node (114).
  • a non-transitory computer readable storage medium including computer instructions that, when executed by a user equipment (110), cause the user equipment (110) to receive (508), from a first network node (112), an indication (508a) of an inter-radio access technology handover (inter-RAT HO) from the first network node (112) of a first radio access technology to a second network node (114) of a second radio access technology, wherein the first radio access technology is different from the second radio access technology, and wherein the indication (508a) indicates that multi-radio access technology spectrum sharing (MRSS) inter- radio access technology handover is applied.
  • inter-RAT HO inter-radio access technology handover
  • MRSS multi-radio access technology spectrum sharing
  • the user equipment (110) is further caused to apply time and/or frequency synchronization values of the first radio access technology of the first network node to the second network node during the multi-radio access technology spectrum sharing (MRSS) inter-radio access technology handover, when it is determined that the received indication (508a) indicates that the user equipment (110) is to apply time and/or frequency synchronization values (518) from the first network node (112) of the first radio access technology to the second network node (114) of the second radio access technology.
  • MRSS multi-radio access technology spectrum sharing
  • a non-transitory computer readable storage medium including computer instructions that, when executed by a first network node (112), cause the first network node (112) to transmit (504), to a second network node (114), a handover request (504a) including an indication (508a) to apply a multi-radio access technology spectrum sharing (MRSS) inter-radio access technology handover, wherein the handover request (504a) indicates whether a new cell radio network temporary identifier (C-RNU) (506b) is needed, and wherein the multi-radio access technology spectrum sharing (MRSS) inter-radio access technology handover takes place between the first network node (112) of a first radio access technology and the second network node (114) of a second radio access technology, wherein the first radio access technology is different from the second radio access technology.
  • MRSS multi-radio access technology spectrum sharing
  • the first network node (112) is further caused to transmit (508), to a user equipment (110), the indication (508a) to apply the multi -radio access technology spectrum sharing (MRSS) inter-radio access technology handover, wherein the indication (508a) further indicates that the user equipment (110) is to apply time and/or frequency synchronization values (518) from the first network node access technology.
  • the first network node (112) is further caused to transmit (510), to the user equipment (110), a resources configuration (510a) that schedules resources (512a/512b) to be received by the user equipment from one of: the first network node (112) or the second network node (114).
  • FIG. 1 is a block diagram of a system including a user equipment, a source network node, and a target network node, configured to communicate via at least one of uplink and downlink transmission in accordance with an example embodiment of the present disclosure
  • FIG. 2 illustrates a communications device that may include various components configured to perform operations for the techniques disclosed herein in accordance with aspects of the present disclosure
  • FIG. 3 depicts MRSS with both 5G and 6G service and system aspects (SA) in accordance with previous embodiments;
  • FIG. 4 is a signal diagram illustrating an inter-RAT HO procedure from a 5G cell to a 6G cell in accordance with previous embodiments
  • FIG. 5A is a signal diagram illustrating a procedure for inter-RAT HO for MRSS deployment in accordance with example embodiments of the present disclosure
  • FIG. 5B is a signal diagram illustrating an alternative procedure for inter-RAT HO for MRSS deployment in accordance with example embodiments of the present disclosure
  • FIG. 6 is a flow chart illustrating a procedure performed by a user equipment for performing multi-radio access technology spectrum sharing inter-radio access technology handover in accordance with example embodiments of the present disclosure
  • FIG. 7 is a flow chart illustrating a procedure performed by a first network node for transmitting a resources configuration in accordance with example embodiments of the present disclosure
  • FIG. 8 is a flow chart illustrating a procedure performed by a user equipment for applying time and/or frequency synchronization values during a multi-radio access technology spectrum sharing inter-radio access technology handover in accordance with example embodiments of the present disclosure
  • FIG. 9 is a flow chart illustrating a procedure performed by a first network node for indicating that the same time and/or frequency synchronization values should be applied to a second network node in accordance with example embodiments of the present disclosure
  • FIG. 10 is a flow chart illustrating a procedure performed by a user equipment for performing a random access channel-less procedure or maintaining an uplink timing adjustment in accordance with example embodiments of the present disclosure.
  • FIG. 11 is a flow chart illustrating a procedure performed by a first network node for indicating that a random access channel-less procedure should be performed or an uplink timing adjustment should be maintained in accordance with example embodiments of the present disclosure.
  • “higher” may be used interchangeably with “greater,” and “highest” may be used interchangeably with “greatest.” Additionally, as used herein, “lower than” may be used interchangeably with “less than,” and “lowest” may be used interchangeably with “least.”
  • circuitry refers to (a) hardware-only circuit implementations (e.g., implementations in analog circuitry and/or digital circuitry); (b) combinations of circuits and computer program product(s) including software and/or firmware instructions stored on one or more computer readable memories that work together to cause an apparatus to perform one or more functions described herein; and (c) circuits, such as, for example, a microprocessor(s) or a portion of a microprocessor(s), that require software or firmware for operation even if the software or firmware is not physically present.
  • This definition of “circuitry” applies to all uses of this term herein, including in any claims.
  • circuitry also includes an implementation including one or more processors and/or portion(s) thereof and accompanying software and/or firmware.
  • circuitry as used herein also includes, for example, a baseband integrated circuit or applications processor integrated circuit for a mobile phone or a similar integrated circuit in a server, a cellular network device, other network device (such as a core network apparatus), field programmable gate array, and/or other computing device.
  • computer-readable medium refers to non-transitory storage hardware, non-transitory storage device or non-transitory computer system memory that may be accessed by a controller, a microcontroller, a computational system or a module of a computational system to encoded thereon computer-executable instructions or software programs.
  • a non-transitory “computer readable medium” may be accessed by a computational system or a module of a computational system to retrieve and/or execute the computerexecutable instructions or software programs encoded on the medium.
  • non- transitory computer-readable media may include, but are not limited to, one or more types of hardware memory, non-transitory tangible media (for example, one or more magnetic storage disks, one or more optical disks, one or more universal synchronous bus (USB) flash drives), computer system memory or random-access memory (such as dynamic random access memory (DRAM), static random access memory (SRAM), extended data out random access memory (EDO RAM), and the like.
  • non-transitory tangible media for example, one or more magnetic storage disks, one or more optical disks, one or more universal synchronous bus (USB) flash drives
  • computer system memory or random-access memory such as dynamic random access memory (DRAM), static random access memory (SRAM), extended data out random access memory (EDO RAM), and the like.
  • DRAM dynamic random access memory
  • SRAM static random access memory
  • EDO RAM extended data out random access memory
  • a system 100 is provided in accordance with an example embodiment.
  • the system may be configured in various manners, the system of one embodiment is depicted in FIG. 1 and includes user equipment 110, source network node 112, and target network node 114 configured to communicate via at least one of uplink and downlink transmission and reception beams.
  • the system may include and the user equipment 110, source network node 112, and target network node 114 may communicate with additional user equipment devices and/or network nodes in other embodiments.
  • the user equipment 110 and network nodes 112/114 may be configured to support, for example, 5G, 5G advanced, or 6G.
  • a source network node 112 may be configured to support 5G and a target network node 114 may be configured to support 6G or vice versa.
  • a user equipment 110 may be handed over from a source network node 112 to a target network node 114 using an inter-RAT HO procedure.
  • the data that is transmitted between the user equipment and network nodes may be any of a wide variety of data including, but not limited to digital imagery data including video data, audio data as well as data provided by sensors, radars, telescopes and radio receivers.
  • the data is encoded prior to communication of the data and decoded upon reception.
  • the resulting data received may be utilized for a variety of purposes including presentation to a user, storage of the data for subsequent use and/or provision of the data to one or more applications, such as applications that perform statistical inference on the data for various purposes including object recognition, image classification, spectrum sensing, speech transcription and/or prediction or detection of events.
  • the user equipment of FIG. 1 (also called UE, user device, user terminal, terminal device, etc.) illustrates a type of an apparatus to which resources on an air interface are allocated and assigned.
  • the user equipment typically refers to a portable computing device that includes wireless mobile communication devices operating with or without a subscriber identification module (SIM), including, but not limited to, the following types of devices: a mobile station (mobile phone), smartphone, personal digital assistance (PDA), handset, device using a wireless modem (alarm or measurement device, etc.), laptop and/or touch screen computer, tablet, game console, notebook, and multimedia device.
  • SIM subscriber identification module
  • User equipment may also be a device having capability to operate in Internet of Things (loT) network which is a scenario in which objects are provided with the ability to transfer data over a network without requiring human-to-human or human-to-computer interaction.
  • the user equipment may also be called a subscriber unit, mobile station, remote terminal, access terminal, user terminal, or user equipment (UE) just to mention but a few names or apparatuses.
  • the source network node 112 and target network node 114 of FIG. 1 may include, for example, base stations such as remote radio heads (RRHs), transmission reception points (TRPs), Y1 access points, node Bs (e.g., eNB, gNB) or other transmission sources.
  • the network nodes 112/114 may be configured to communicate with user equipment 110 via a network.
  • the network nodes 112/114 may be accessed through a gateway.
  • Source network node 112 may be of a different random access technology than target network node 114.
  • source network node 112 may be configured to support 5G and target network node 114 may be configured to support 6G or vice versa.
  • source network node 112 and target network node 114 may be embodied in the same network node.
  • FIG. 2 depicts an example apparatus 200 that may be configured to function as user equipment 110, source network node 112, target network node 114, and/or the like.
  • the apparatus includes, is associated with, or is in communications with processing circuitry 220, a memory 240, and a communication interface 260.
  • the processing circuitry 220 may be in communication with the memory device 240 via a bus for passing information among components of the apparatus.
  • the memory device may be non-transitory and may include, for example, one or more volatile and/or non-volatile memories.
  • the memory device may be an electronic storage device (e.g., a computer readable storage medium) including gates configured to store data (e.g., bits) that may be retrievable by a machine (e.g., a computing device like the processing circuitry).
  • the memory device may be configured to store information, data, content, applications, instructions, or the like for enabling the apparatus to carry out various functions in accordance with an example embodiment of the present disclosure.
  • the memory device could be configured to buffer input data for processing by the processing circuitry. Additionally or alternatively, the memory device could be configured to store instructions for execution by the processing circuitry.
  • the apparatus 200 may, in some embodiments, be embodied in various computing devices described as above. However, in some embodiments, the apparatus may be embodied as a chip or chip set. In other words, the apparatus may include one or more physical packages (e.g., chips) including materials, components and/or wires on a structural assembly (e.g., a baseboard). The structural assembly may provide physical strength, conservation of size, and/or limitation of electrical interaction for component circuitry included thereon. The apparatus may therefore, in some cases, be configured to implement an embodiment on a single chip or as a single “system on a chip.” As such, in some cases, a chip or chipset may constitute means for performing one or more operations for providing the functionalities described herein.
  • a chip or chipset may constitute means for performing one or more operations for providing the functionalities described herein.
  • the processing circuitry 220 may be embodied in a number of different ways.
  • the processing circuitry may be embodied as one or more of various hardware processing means such as a coprocessor, a microprocessor, a controller, a digital signal processor (DSP), a processing element with or without an accompanying DSP, or various other circuitry including integrated circuits such as, for example, an ASIC (application specific integrated circuit), an FPGA (field programmable gate array), a microcontroller unit (MCU), a hardware accelerator, a special-purpose computer chip, or the like.
  • the processing circuitry may include one or more processing cores configured to perform independently.
  • a multi-core processing circuitry may enable multiprocessing within a single physical package.
  • the processing circuitry may include one or more processors configured in tandem via the bus to enable independent execution of instructions, pipelining, and/or multithreading.
  • the processing circuitry 220 may be configured to execute instructions stored in the memory device 240 or otherwise accessible to the processing circuitry. Alternatively or additionally, the processing circuitry may be configured to execute hardcoded functionality. As such, whether configured by hardware or software methods, or by a combination thereof, the processing circuitry may represent an entity (e.g., physically embodied in circuitry) capable of performing operations according to an embodiment of the present disclosure while configured accordingly. Thus, for example, when the processing circuitry is embodied as an ASIC, FPGA or the like, the processing circuitry may be specifically configured hardware for conducting the operations described herein.
  • the processing circuitry when the processing circuitry is embodied as an executor of instructions, the instructions may specifically configure the processor to perform the algorithms and/or operations described herein when the instructions are executed.
  • the processing circuitry may be a processor of a specific device (e.g., an image or video processing system) configured to employ an embodiment by further configuration of the processing circuitry by instructions for performing the algorithms and/or operations described herein.
  • the processing circuitry may include, among other things, a clock, an arithmetic logic unit (ALU) and logic gates configured to support operation of the processing circuitry.
  • ALU arithmetic logic unit
  • the communication interface 260 may be any means such as a device or circuitry embodied in either hardware or a combination of hardware and software that is configured to receive and/or transmit data including media content in the form of video or image files, one or more audio tracks or the like.
  • the communication interface may include, for example, an antenna (or multiple antennas) and supporting hardware and/or software for enabling communications with a wireless communication network. Additionally or alternatively, the communication interface may include the circuitry for interacting with the antenna(s) to cause transmission of signals via the antenna(s) or to handle receipt of signals received via the antenna(s).
  • the communications interface may alternatively or also support wired communication.
  • the communication interface may include a communication modem and/or other hardware/software for supporting communication via cable, digital subscriber line (DSL), universal serial bus (USB) or other mechanisms.
  • FIG. 3 a depiction 300 of 5G/6GMRSS is depicted in accordance with previous embodiments.
  • MRSS allows new radio (NR) and 6G cells to share the same carrier(s) dynamically adapting to traffic requirements.
  • a 5G cell 310 and a 6G cell 320 share the same radio unit (RU) 330.
  • the same coverage is expected by the 5GMRSS cell 310 and the 6G MRSS cell 320.
  • a user equipment 340 may have a 5G connection and a user equipment 350 may have a 6G connection in the same coverage area.
  • FIG. 4 a signaling diagram 400 illustrating a procedure for inter-RAT HO is provided in accordance with previous embodiments.
  • a user equipment 410 is transitioning from a source cell 412 which supports 5Gto a target cell 414 which supports 6G.
  • Inter-RAT HO is the main procedure to move the user equipment 410 from one RAT (e.g., 5G) to another RAT (e.g., 6G).
  • User equipment measurements are considered as input for the handover decision.
  • a measurement configuration is transmitted from the source cell 412 to the user equipment 410.
  • the user equipment 410 transmits measurement reports to the source cell 412 at operation 418.
  • the source cell 412 then makes a handover decision based on the measurement reports at operation 420.
  • the source cell 412 transmits, to the target cell 414, a handover request for context transfer.
  • the target cell 414 performs admission control before confirming the handover request at operation 426.
  • the handover request confirmation transmitted at operation 426 includes a new cell radio network temporary identifier (C-RNTI).
  • C-RNTI new cell radio network temporary identifier
  • the source cell 412 transmits a radio resource control reconfiguration with the new C-RNTI to the user equipment 410.
  • the user equipment 410 performs synchronization and establishes a physical random access channel with target cell 414.
  • the target cell 414 transmits random access channel resources to the user equipment 410 and, at operation 434, the user equipment 410 responds to the target cell 414 by confirming that the radio resource control reconfiguration is complete.
  • a delay during the inter-RAT HO may be around 50 ms in New Radio (NR) or 80 ms in Long-Term Evolution (LTE) between operation 416 and operation 434.
  • This delay depends on the architecture of source cell 412 and target cell 414 (e.g., whether they are of centralized unit/distributed unit disaggregated architecture or monolithic gNBs).
  • the delay depends on the interface between the source cell 412 and the target cell 414.
  • the delay may increase for inter-RAT HO with respect to intra-RAT HO. Higher delay to complete a HO is correlated with an increase of HO failure and radio link failure.
  • FIG. 5A a signal diagram illustrating a procedure for inter-RAT HO for MRSS deployment is provided in accordance with example embodiments of the present disclosure.
  • source cell 112 of a first RAT decides to move user equipment devices to a target cell 114 of a second RAT.
  • source cell 114 decides to move user equipment 110 to the target cell 114 of the second RAT.
  • source cell 112 supports a 5G RAT and target cell 114 supports a 6G RAT.
  • source cell 112 supports a 6G RAT and target cell 114 supports a 5G RAT.
  • each of the first RAT and the second RAT have a MRSS feature enabled.
  • the source cell 112 determines to move the user equipment 110 for network energy savings purposes.
  • moving user equipment 110 from a 6G cell to a 5G cell may save power consumption at the distributed unit side of 6G.
  • the decision may be service based.
  • 6G may have limitations in supported services, such as voice.
  • a user equipment initiating one of these supported services can be moved to a 5G cell.
  • voice may be supported over new radio in 5G.
  • no user equipment measurement is needed to determine to move the user equipment 110.
  • source cell 112 of the first RAT sends a handover request 5044 to the target cell 114 of the second RAT.
  • the handover request 504a includes an indication 508a that inter-RAT handover MRSS is applied.
  • the handover request 504a includes an indication of whether a new C-RNTI 506b is needed.
  • the handover request 504a implicitly indicates that a new C- RNTI 506b is not needed by indicating the handover reason as inter-RAT HO MRSS.
  • target cell 114 interprets this as the same C-RNTI 506c can be used.
  • the handover request 504a explicitly indicates that the same C-RNTI 506c should be used.
  • the handover request explicitly indicates that a new C-RNTI 506c should be used.
  • target cell 114 transmits, to source cell 112, a handover request confirmation 506a.
  • a new C-RNTI 506b is generated.
  • the same C-RNTI 506c is used.
  • a new C- RNTI 506b or a same C-RNTI 506c is used based on the indication in the handover request 504a of whether a new C-RNTI 506b is needed.
  • a cell specific configuration is transmitted from the target cell 114 of the second RAT to the source cell 112 of the first RAT.
  • a C-RNTI is generated when source cell 112 and target cell 114 are coordinating such that one C-RNTI is used by either source cell 112 or target cell 114 but cannot be used by both.
  • source cell 112 and target cell 114 are coordinating , it is possible to have a C-RNTI as identification to the user equipment 110 for two MRSS cells (e.g., the source cell 112 of the first RAT and the second cell 114 of the second RAT).
  • source cell 112 transmits, to user equipment 110, a dynamic indication 508a of MRSS inter-RAT handover.
  • the indication 508a indicates that MRSS inter-RAT handover is applied between the source cell 112 of the first RAT and the target cell 114 of the second RAT.
  • the indication 508a can be downlink control information (DCI)-based or medium access control (MAC)-control element (CE) based signaling.
  • the indication contains a flag indicating that MRSS inter-RAT handover is applied.
  • the indication 508a includes a cell identity (e.g., physical cell identifier) of target cell 114 of the second RAT if it is different than the source cell 112 of the first RAT.
  • a cell identity e.g., physical cell identifier
  • user equipment based on the indication 508a from source cell 112 of the first RAT, assumes that time and frequency synchronization of source cell 112 of the first RAT are applicable for target cell 114 of the second RAT during the handover procedure.
  • the user equipment 112 based on the indication 508a from the source cell 112 of the first RAT, the user equipment 112 assumes that a synchronization signal block (SSB) for the source cell 112 is considered as a reference signal (RS) reference for the target cell 114 during the handover procedure.
  • SSB synchronization signal block
  • RS reference signal
  • the user equipment 110 based on the indication 508a from the source cell 112 of the first RAT, the user equipment 110 assumes that no user equipment measurements, measurement gaps, or SMTC windows are needed by the user equipment for moving from source cell 112 to target cell 114.
  • a resources configuration 510a is sent with the indication 508a of the MRSS inter-RAT handover.
  • the same service capability server is used for MRSS inter-RAT handover.
  • system frame number counting is used when source cell 112 timing is re-used.
  • user equipment 110 is not requires to detect a primary synchronization signal (PSS) or secondary synchronization signal (SSS) 518 for downlink synchronization.
  • PSS primary synchronization signal
  • SSS secondary synchronization signal
  • the user equipment 110 can consider the time/frequency synchronization from the PSS/SSS of the source cell 112 of the first RAT to apply to the target cell 112 of the second RAT.
  • a random access channel (RACH)-less procedure 520 is applied for maintaining uplink timing synchronization for the target cell 114 of the second RAT.
  • the user equipment 110 does not expect any RACH configuration and doesn’t need to initiate RACH on the target cell 114 of the second RAT.
  • the user equipment 110 maintains the uplink timing adjustment using the equation + NTA, offset') x T c , where N ⁇ urce is the latest timing advance command received by the user equipment from a source cell of a first RAT.
  • the user equipment 110 maintains or applies at least part of an uplink power control configuration, such as closed-loop and/or open-loop power control, of the source cell 112 of the first RAT for the target cell 114 of the second RAT.
  • an uplink multiple-input, multiple-output (MIMO) scheme or transmission configuration indicator (TCI) state is maintained or indicated in the switching.
  • MIMO multiple-input, multiple-output
  • TCI transmission configuration indicator
  • the same beam for the first RAT may be re-used for the second RAT.
  • the source cell 112 of the first RAT signals the user equipment 110 with a resources configuration 510a.
  • the resources configuration 510a is pre-defined.
  • the resources configuration schedules resources 512a and/or a cell-specific configuration that may be transmitted via a physical downlink shared channel (PDSCH) to the user equipment 110 by the source cell 112 of the first RAT or the target cell 114 of the second RAT.
  • the resources configuration 510a is a pre-configured downlink resources (PDR) resources configuration.
  • the resources configuration 510a is transmitted via physical downlink control channel (PDCCH).
  • the resources configuration 510a is signaled by DCI.
  • the resources configuration includes physical layer parameters (e.g., frequency domain resource assignment, modulation and coding scheme, and the like) for the scheduled resources 512a.
  • the source cell (i.e., first network node) 112 of the first RAT (depicted in FIG. 5 A) or the target cell (i.e., second network node) 114 of the second RAT transmits, to the user equipment 110, the scheduled resources 512a.
  • the resources include time, frequency, and/or spatial resources where a user equipment can acquire a cell-specific configuration.
  • the resources are transmitted via physical downlink shared channel (PDSCH).
  • the resources are transmitted with at least part of the cell-specific configuration of the target cell 114 of the second RAT.
  • the user equipment 110 decodes the scheduled resources 512a to acquire the cell-specific configuration of the target cell 114 of the second RAT.
  • the user equipment 110 transmits, to the source cell (i.e., first network node) 112 of the first RAT, an acknowledgment 514a that the user equipment 110 received the scheduled resources 512a.
  • the acknowledgment 514a is interpreted at the network side as the MRSS inter-RAT handover being complete.
  • a negative acknowledgment is sent by the user equipment 110 to the source cell 112 of the first RAT if the scheduled resources 512a are not received.
  • user equipment 110 is connected with target cell (i.e., second network node) 114 of the second RAT.
  • target cell i.e., second network node
  • the user equipment 110 is in a radio resource control connected state with target cell 114 of the second RAT.
  • FIG. 5B an alternative signal diagram illustrating a procedure for inter- RAT HO for MRSS deployment is provided in accordance with example embodiments of the present disclosure.
  • source cell 112 of a first RAT decides to move user equipment devices to a target cell 114 of a second RAT.
  • source cell 114 decides to move user equipment 110 to the target cell 114 of the second RAT.
  • source cell 112 supports a 5G RAT and target cell 114 supports a 6G RAT.
  • source cell 112 supports a 6G RAT and target cell 114 supports a 5G RAT.
  • each of the first RAT and the second RAT have a MRSS feature enabled.
  • the source cell 112 determines to move the user equipment 110 for network energy savings purposes.
  • moving user equipment 110 from a 6G cell to a 5G cell may save power consumption at the distributed unit side of 6G.
  • the decision may be service based.
  • 6G may have limitations in supported services, such as voice.
  • a user equipment initiating one of these supported services can be moved to a 5G cell.
  • voice may be supported over new radio in 5G.
  • no user equipment measurement is needed to determine to move the user equipment 110.
  • source cell 112 of the first RAT sends a handover request 5044 to the target cell 114 of the second RAT.
  • the handover request 504a includes an indication 508a that inter-RAT handover MRSS is applied.
  • the handover request 504a includes an indication of whether a new C-RNTI 506b is needed.
  • the handover request 504a implicitly indicates that a new C- RNH 506b is not needed by indicating the handover reason as inter-RAT HO MRSS.
  • target cell 114 interprets this as the same C-RNTI 506c can be used.
  • the handover request 504a explicitly indicates that the same C-RNTI 506c should be used.
  • the handover request explicitly indicates that a new C-RNTI 506c should be used.
  • target cell 114 transmits, to source cell 112, a handover request confirmation 506a.
  • a new C-RNTI 506b is generated.
  • the same C-RNTI 506c is used.
  • a new C- RNTI 506b or a same C-RNTI 506c is used based on the indication in the handover request 504a of whether a new C-RNTI 506b is needed.
  • a C-RNTI is generated when source cell 112 and target cell 114 are coordinating such that one C-RNU is used by either source cell 112 or target cell 114 but cannot be used by both.
  • source cell 112 transmits, to user equipment 110, a dynamic indication 508a of MRSS inter-RAT handover.
  • the indication 508a indicates that MRSS inter-RAT handover is applied between the source cell 112 of the first RAT and the target cell 114 of the second RAT.
  • the indication 508a can be downlink control information (DCI)-based or medium access control (MAC)-control element (CE) based signaling.
  • the indication contains a flag indicating that MRSS inter-RAT handover is applied.
  • the indication 508a includes a cell identity (e.g., physical cell identifier) of target cell 114 of the second RAT if it is different than the source cell 112 of the first RAT.
  • a cell identity e.g., physical cell identifier
  • user equipment based on the indication 508a from source cell 112 of the first RAT, assumes that time and frequency synchronization of source cell 112 of the first RAT are applicable for target cell 114 of the second RAT during the handover procedure.
  • the user equipment 112 based on the indication 508a from the source cell 112 of the first RAT, the user equipment 112 assumes that a synchronization signal block (SSB) for the source cell 112 is considered as a reference signal (RS) reference for the target cell 114 during the handover procedure.
  • SSB synchronization signal block
  • RS reference signal
  • the user equipment 110 based on the indication 508a from the source cell 112 of the first RAT, the user equipment 110 assumes that no user equipment measurements, measurement gaps, or SMTC windows are needed by the user equipment for moving from source cell 112 to target cell 114.
  • a resources configuration 510a is sent with the indication 508a of the MRSS inter-RAT handover.
  • the same service capability server is used for MRSS inter-RAT handover.
  • system frame number counting is used when source cell 112 timing is re-used.
  • user equipment 110 is not requires to detect a primary synchronization signal (PSS) or secondary synchronization signal (SSS) 518 for downlink synchronization.
  • PSS primary synchronization signal
  • SSS secondary synchronization signal
  • the user equipment 110 can consider the time/frequency synchronization from the PSS/SSS of the source cell 112 of the first RAT to apply to the target cell 112 of the second RAT.
  • a random access channel (RACH)-less procedure 520 is applied for maintaining uplink timing synchronization for the target cell 114 of the second RAT.
  • the user equipment 110 does not expect any RACH configuration and doesn’t need to initiate RACH on the target cell 114 of the second RAT.
  • the user equipment 110 maintains the uplink timing adjustment using the equation + NTA, offset X T c , where N ⁇ urce is the latest timing advance command received by the user equipment from a source cell of a first RAT.
  • the user equipment 110 maintains or applies at least part of an uplink power control configuration, such as closed-loop and/or open-loop power control, of the source cell 112 of the first RAT for the target cell 114 of the second RAT.
  • an uplink multiple-input, multiple-output (MIMO) scheme or transmission configuration indicator (TCI) state is maintained or indicated in the switching.
  • MIMO multiple-input, multiple-output
  • TCI transmission configuration indicator
  • the same beam for the first RAT may be re-used for the second RAT.
  • the source cell 112 of the first RAT signals the user equipment 110 with a resources configuration 510a.
  • source cell 112 of the first RAT further exchanges 510b information including resources configuration 510a with target cell 114 of the second RAT.
  • the resources configuration 510a is pre-defined.
  • the resources configuration schedules resources 512a and/or a cell-specific configuration that may be transmitted via a physical downlink shared channel (PDSCH) to the user equipment 110 by the source cell 112 of the first RAT or the target cell 114 of the second RAT.
  • the resources configuration 510a is a packet detection rules resources configuration.
  • the resources configuration 510a is transmitted via physical downlink control channel (PDCCH). In one or more embodiments, the resources configuration 510a is signaled by DCI. In some examples, the resources configuration includes physical layer parameters (e.g., frequency domain resource assignment, modulation and coding scheme, and the like) for the scheduled resources 512a.
  • PDCCH physical downlink control channel
  • the resources configuration includes physical layer parameters (e.g., frequency domain resource assignment, modulation and coding scheme, and the like) for the scheduled resources 512a.
  • the target cell 112 of the first RAT or the target cell 114 of the second RAT transmits, to the user equipment 110, the scheduled resources 512b.
  • the resources include time, frequency, and/or spatial resources where a user equipment can acquire a cell-specific configuration.
  • the resources are transmitted via physical downlink shared channel (PDSCH).
  • PDSCH physical downlink shared channel
  • a cell specific configuration is transmitted from the target cell 114 of the second RAT to the user equipment 110.
  • the resources are transmitted with at least part of the cell-specific configuration of the target cell 114 of the second RAT.
  • the user equipment 110 decodes the scheduled resources 512b to acquire the cell-specific configuration of the target cell 114 of the second RAT.
  • the user equipment 110 transmits, to the target cell 114 of the second RAT, an acknowledgment 514b that the user equipment 110 received the scheduled resources 512b.
  • the acknowledgment 514b is interpreted at the network side as the MRSS inter-RAT handover being complete.
  • a negative acknowledgment is sent by the user equipment 110 to the target cell 114 of the second RAT if the scheduled resources 512a are not received.
  • user equipment 110 is connected with target cell 114 of the second RAT.
  • the user equipment 110 is in a radio resource control connected state with target cell 114 of the second RAT.
  • FIG. 6 an example flowchart is illustrated for a process 600 performed by an apparatus embodied by, associated with or otherwise in communication with (hereinafter generally referenced as being embodied by) a user equipment (110) in order to perform multiradio access technology spectrum sharing inter-radio access technology handover in accordance with example embodiments of the present disclosure.
  • the apparatus embodied by the user equipment (110) includes means, such as the processing circuitry (220), the communication interface (260), the like, for receiving (508), from a first network node (112), an indication (508a) of an inter-radio access technology handover (inter-RAT HO) from the first network node (112) of a first radio access technology to a second network node (114) of a second radio access technology, wherein the first radio access technology is different from the second radio access technology, and wherein the indication (508a) indicates that multi-radio access technology spectrum sharing (MRSS) inter-radio access technology handover is applied.
  • MRSS multi-radio access technology spectrum sharing
  • the indication (508a) of the multi-radio access technology spectrum sharing (MRSS) inter-radio access technology handover is one of downlink control (DL) information based or medium access control (MAC) control element based.
  • the indication (508a) received from the first network node (112) includes: a new cell radio network temporary identifier (C-RNTI) (506b).
  • C-RNTI new cell radio network temporary identifier
  • the indication (508a) of the multiradio access technology spectrum sharing (MRSS) inter-radio access technology handover sharing further indicates at least one or more of that a synchronization signal block (SSB) for the first network node (112) is to be considered as a reference signal (RS) reference for the second network node (114) or that no measurement gap or S SB-based measurement timing configuration (SMTC) window is needed.
  • SSB synchronization signal block
  • RS reference signal
  • SMTC measurement timing configuration
  • the first network node (112) of the first radio access technology and the second network node (114) of the second radio access technology are either collocated or non-collocated; wherein at least one of the first radio access technology or the second radio access technology includes a 5G radio access technology, and at least one of the first radio access technology or the second radio access technology includes a 6G radio access technology.
  • at least one of an uplink multiple-input, multiple-output (MIMO) scheme or an uplink transmission configuration indicator (TCI) state is maintained when a common beam is used for the first random access technology and the second random access technology.
  • MIMO multiple-input, multiple-output
  • TCI uplink transmission configuration indicator
  • the apparatus embodied by the user equipment (110) includes means, such as the processing circuitry (220), the communication interface (260), the like, for receiving (510), from the first network node (112), a resources configuration (510a) that schedules resources (512a/512b) to be received from one of: the first network node (112) or the second network node (114).
  • means such as the processing circuitry (220), the communication interface (260), the like, for receiving (510), from the first network node (112), a resources configuration (510a) that schedules resources (512a/512b) to be received from one of: the first network node (112) or the second network node (114).
  • the resources configuration (510a) configures the user equipment to perform at least one of: receive at least a first portion of the scheduled resources (PDSCH) (512a/512b) that are carried in one of: the first radio access technology or the second radio access technology or activate at least a second portion of the scheduled resources (PDSCH) (512a/512b) that are pre-configured in one of: the first radio access technology or the second radio access technology.
  • the resources configuration (510a) includes physical layer parameters for the scheduled resources (PDSCH) (512a/512b).
  • the apparatus embodied by the user equipment (110) includes means, such as the processing circuitry (220), the communication interface (260), the like, for performing the multi-radio access technology spectrum sharing (MRSS) inter- radio access technology handover based on the indication and the scheduled resources (PDSCH) (512a/512b).
  • the user equipment further includes means for receiving (512), from one of the first network node (112) or the second network node (114), a cell-specific configuration of the second network node (114), wherein the cell-specific configuration is acquired from the scheduled resources (PDSCH) (512a/512b).
  • the user equipment (110) further includes means for transmitting (514), to one of the first network node (112) or the second network node (114), a scheduled resources (PDSCH) acknowledgment (514a/514b) to indicate whether the multi-radio access technology spectrum sharing (MRSS) inter-radio access technology handover is successful or not.
  • the user equipment (110) further includes means for applying at least part of an uplink power control related configuration of the first network node to the second network node, wherein the uplink power control related configuration includes at least one of: a first parameter for closed-loop power control or a second parameter for open-loop power control.
  • FIG. 7 an example flowchart is illustrated for a process 700 performed by an apparatus embodied by, associated with or otherwise in communication with (hereinafter generally referenced as being embodied by) a first network node (112) in order to transmit a resources configuration in accordance with example embodiments of the present disclosure.
  • a process 700 performed by an apparatus embodied by, associated with or otherwise in communication with (hereinafter generally referenced as being embodied by) a first network node (112) in order to transmit a resources configuration in accordance with example embodiments of the present disclosure.
  • the apparatus embodied by the first network node (112) includes means, such as the processing circuitry (220), the communication interface (260), the like, for transmitting (504), to a second network node (114), a handover request (504a) including an indication (508a) to apply a multi-radio access technology spectrum sharing (MRSS) interradio access technology handover, wherein the handover request (504a) indicates whether a new cell radio network temporary identifier (C-RNTI) (506b) is needed, and wherein the multi-radio access technology spectrum sharing (MRSS) inter-radio access technology handover takes place between the first network node (112) of a first radio access technology and the second network node (114) of a second radio access technology, wherein the first radio access technology is different from the second radio access technology.
  • MRSS multi-radio access technology spectrum sharing
  • the indication (508a) to apply the multi -radio access technology spectrum sharing (MRSS) inter-radio access technology handover includes: the new cell radio network temporary identifier (C-RNTI) (506b).
  • the handover request indicates a handover reason as inter-radio access technology handover multi-radio access technology spectrum sharing
  • the handover request does not include the new cell radio network temporary identifier (C-RNTI) (506b).
  • the indication (508a) to apply the multiradio access technology spectrum sharing (MRSS) inter-radio access technology handover includes the new cell radio network temporary identifier (506b).
  • the first network node (112) of the first radio access technology and the second network node (114) of the second radio access technology are either collocated or non-collocated; wherein at least one of the first radio access technology or the second radio access technology includes a 5G radio access technology, and at least one of the first radio access technology or the second radio access technology includes a 6G radio access technology.
  • at least one of an uplink multiple-input, multiple-output (MIMO) scheme or an uplink transmission configuration indicator (TCI) state is maintained when a common beam is used for the first random access technology and the second random access technology.
  • MIMO uplink multiple-input, multiple-output
  • TCI uplink transmission configuration indicator
  • the apparatus embodied by the first network node (112) includes means, such as the processing circuitry (220), the communication interface (260), the like, for transmitting (508), to a user equipment (110), the indication (508a) to apply the multiradio access technology spectrum sharing (MRSS) inter-radio access technology handover.
  • the indication (508a) to apply the multi-radio access technology spectrum sharing (MRSS) inter- radio access technology handover is one of downlink control information based or medium access control (MAC) control element based.
  • the indication (508a) to apply the multi-radio access technology spectrum sharing (MRSS) inter-radio access technology handover further indicates at least one or more of: that a synchronization signal block (SSB) for the first network node (112) is to be considered as a reference signal (RS) reference for the second network node (114); or that no measurement gap or S SB-based measurement timing configuration (SMTC) window is needed.
  • SSB synchronization signal block
  • RS reference signal
  • SMTC measurement timing configuration
  • the apparatus embodied by the first network node (112) includes means, such as the processing circuitry (220), the communication interface (260), the like, for transmitting (510), to the user equipment (110), a resources configuration (510a) that schedules resources (512a/512b) to be received by the user equipment from one of: the first network node (112) or the second network node (114).
  • means such as the processing circuitry (220), the communication interface (260), the like, for transmitting (510), to the user equipment (110), a resources configuration (510a) that schedules resources (512a/512b) to be received by the user equipment from one of: the first network node (112) or the second network node (114).
  • the first network node (112) further performs one or more of: receive (506), from the second network node (114), a handover request confirmation (506a); transmit the handover request (504a) in response to an energy efficiency determination (502); transmit, to the user equipment (110) or the second network node (114), the scheduled resources (PDSCH) (512a); transmit (512), to the user equipment (110), a cell-specific configuration of the second network node (114), wherein the cell-specific configuration is acquired from the scheduled resources (PDSCH) (512a); or receive (514), from the user equipment (110), a scheduled resources (PDSCH) acknowledgment (514a).
  • the first network node (112) further includes means for causing the user equipment (110) to apply at least part of an uplink power control related configuration of the first network node to the second network node, wherein the uplink power control related configuration includes at least one of: a first parameter for closed-loop power control or a second parameter for open-loop power control.
  • the resources configuration (510a) includes physical layer parameters for the scheduled resources (PDSCH) (512a/512b).
  • an example flowchart is illustrated for a process 800 performed by an apparatus embodied by, associated with or otherwise in communication with (hereinafter generally referenced as being embodied by) a user equipment (110) in order to apply time and/or frequency synchronization values during a multi-radio access technology spectrum sharing interradio access technology handover in accordance with example embodiments of the present disclosure.
  • the apparatus embodied by the user equipment (110) includes means, such as the processing circuitry (220), the communication interface (260), the like, for receiving (508), from a first network node (112), an indication (508a) of an inter-radio access technology handover (inter-RAT HO) from the first network node (112) of a first radio access technology to a second network node (114) of a second radio access technology, wherein the first radio access technology is different from the second radio access technology, and wherein the indication (508a) indicates that multi-radio access technology spectrum sharing (MRSS) inter-radio access technology handover is applied.
  • MRSS multi-radio access technology spectrum sharing
  • the indication (508a) of the multi-radio access technology spectrum sharing (MRSS) inter-radio access technology handover is one of downlink control (DL) information based or medium access control (MAC) control element based.
  • the indication (508a) received from the first network node (112) includes: a new cell radio network temporary identifier (C-RNTI) (506b).
  • C-RNTI new cell radio network temporary identifier
  • the first network node (112) of the first radio access technology and the second network node (114) of the second radio access technology are either collocated or non-collocated; wherein at least one of the first radio access technology or the second radio access technology includes a 5G radio access technology, and at least one of the first radio access technology or the second radio access technology includes a 6G radio access technology.
  • at least one of an uplink multiple-input, multiple-output (MIMO) scheme or an uplink transmission configuration indicator (TCI) state is maintained when a common beam is used for the first random access technology and the second random access technology.
  • MIMO multiple-input, multiple-output
  • TCI uplink transmission configuration indicator
  • the apparatus embodied by the user equipment (110) includes means, such as the processing circuitry (220), the communication interface (260), the like, for applying time and/or frequency synchronization values of the first radio access technology of the first network node to the second network node during the multi-radio access technology spectrum sharing (MRSS) inter- radio access technology handover, when it is determined that the received indication (508a) indicates that the user equipment (110) is to apply time and/or frequency synchronization values (518) from the first network node (112) of the first radio access technology to the second network node (114) of the second radio access technology.
  • MRSS multi-radio access technology spectrum sharing
  • the applying of the time and/or frequency synchronization values of the first radio access technology of the first network node to the second network node further includes the user equipment caused to omit the time and/or frequency synchronization values of the second radio access technology of the second network node.
  • the user equipment (110) further includes means for receiving (510), from the first network node (112), a resources configuration (510a) that schedules resources (512a/512b) to be received from one of: the first network node (112) or the second network node (114).
  • the resources configuration (510a) configures the user equipment to perform at least one of: receive at least a first portion of the scheduled resources (PDSCH) (512a/512b) that are carried in one of: the first radio access technology or the second radio access technology; or activate at least a second portion of the scheduled resources (PDSCH) (512a/512b) that are preconfigured in one of: the first radio access technology or the second radio access technology.
  • the user equipment (110) further includes means for transmitting (514), to one of the first network node (112) or the second network node (114), a scheduled resources (PDSCH) acknowledgment (514a/514b) to indicate whether the multi-radio access technology spectrum sharing (MRSS) inter- radio access technology handover is successful or not.
  • the user equipment (110) further includes means for receiving (512), from one of the first network node (112) or the second network node (114), a cell-specific configuration of the second network node (114), wherein the cell-specific configuration is acquired from the scheduled resources (PDSCH) (512a/512b).
  • the time and/or frequency synchronization values (518) from the first network node are determined based on synchronization signals received in downlink (DL).
  • the user equipment (110) further includes means for applying at least part of an uplink power control related configuration of the first network node to the second network node, wherein the uplink power control related configuration includes at least one of: a first parameter for closed-loop power control or a second parameter for open-loop power control.
  • the resources configuration (510a) includes physical layer parameters for the scheduled resources (PDSCH) (512a/512b).
  • FIG. 9 an example flowchart is illustrated for a process 900 performed by an apparatus embodied by, associated with or otherwise in communication with (hereinafter generally referenced as being embodied by) a first network node (112) in order to indicate that the same time and/or frequency synchronization values should be applied to a second network node in accordance with example embodiments of the present disclosure.
  • the apparatus embodied by the first network node (112) includes means, such as the processing circuitry (220), the communication interface (260), the like, for transmitting (504), to a second network node (114), a handover request (504a) including an indication (508a) to apply a multi-radio access technology spectrum sharing (MRSS) interradio access technology handover, wherein the handover request (504a) indicates whether a new cell radio network temporary identifier (C-RNTI) (506b) is needed, and wherein the multi-radio access technology spectrum sharing (MRSS) inter-radio access technology handover takes place between the first network node (112) of a first radio access technology and the second network node (114) of a second radio access technology, wherein the first radio access technology is different from the second radio access technology.
  • MRSS multi-radio access technology spectrum sharing
  • the indication (508a) to apply the multi -radio access technology spectrum sharing (MRSS) inter-radio access technology handover includes: the new cell radio network temporary identifier (C-RNTI) (506b).
  • the handover request indicates a handover reason as inter-radio access technology handover multi-radio access technology spectrum sharing
  • the handover request does not include the new cell radio network temporary identifier (C-RNTI) (506b).
  • the indication (508a) to apply the multiradio access technology spectrum sharing (MRSS) inter-radio access technology handover includes the new cell radio network temporary identifier (506b).
  • the first network node (112) of the first radio access technology and the second network node (114) of the second radio access technology are either collocated or non-collocated; wherein at least one of the first radio access technology or the second radio access technology includes a 5G radio access technology, and at least one of the first radio access technology or the second radio access technology includes a 6G radio access technology.
  • at least one of an uplink multiple-input, multiple-output (MIMO) scheme or an uplink transmission configuration indicator (TCI) state is maintained when a common beam is used for the first random access technology and the second random access technology.
  • MIMO uplink multiple-input, multiple-output
  • TCI uplink transmission configuration indicator
  • the apparatus embodied by the first network node (112) includes means, such as the processing circuitry (220), the communication interface (260), the like, for transmitting (508), to a user equipment (110), the indication (508a) to apply the multiradio access technology spectrum sharing (MRSS) inter-radio access technology handover, wherein the indication (508a) further indicates that the user equipment (110) is to apply time and/or frequency synchronization values (518) from the first network node (112) of the first radio access technology to the second network node (114) of the second radio access technology.
  • MRSS multiradio access technology spectrum sharing
  • the indication (508a) to apply the multi-radio access technology spectrum sharing (MRSS) inter- radio access technology handover is one of downlink control information based or medium access control (MAC) control element based.
  • the time and/or frequency synchronization values (518) of the first network node are determined based on synchronization signals received in downlink (DL).
  • the apparatus embodied by the first network node (112) includes means, such as the processing circuitry (220), the communication interface (260), the like, for transmitting (510), to the user equipment (110), a resources configuration (510a) that schedules resources (512a/512b) to be received by the user equipment from one of: the first network node (112) or the second network node (114).
  • means such as the processing circuitry (220), the communication interface (260), the like, for transmitting (510), to the user equipment (110), a resources configuration (510a) that schedules resources (512a/512b) to be received by the user equipment from one of: the first network node (112) or the second network node (114).
  • the first network node (112) further performs one or more of: receive (506), from the second network node (114), a handover request confirmation (506a); transmit the handover request (504a) in response to an energy efficiency determination (502); transmit, to the user equipment (110) or the second network node (114), the scheduled resources (PDSCH) (512a); transmit (512), to the user equipment (110), a cell-specific configuration of the second network node (114), wherein the cell-specific configuration is acquired from the scheduled resources (PDSCH) (512a); or receive (514), from the user equipment (110), a scheduled resources (PDSCH) acknowledgment (514a).
  • the first network node (112) further includes means for causing the user equipment (110) to apply at least part of an uplink power control related configuration of the first network node to the second network node, wherein the uplink power control related configuration includes at least one of: a first parameter for closed-loop power control or a second parameter for open-loop power control.
  • the resources configuration (510a) includes physical layer parameters for the scheduled resources (PDSCH) (512a/512b).
  • an example flowchart is illustrated for a process 1000 performed by an apparatus embodied by, associated with or otherwise in communication with (hereinafter generally referenced as being embodied by) a user equipment (110) in order to perform a random access channel-less procedure or maintaining an uplink timing adjustment in accordance with example embodiments of the present disclosure.
  • the apparatus embodied by the user equipment (110) includes means, such as the processing circuitry (220), the communication interface (260), the like, for receiving (508), from a first network node (112), an indication (508a) of an inter-radio access technology handover (inter-RAT HO) from the first network node (112) of a first radio access technology to a second network node (114) of a second radio access technology, wherein the first radio access technology is different from the second radio access technology, and wherein the indication indicates that multi-radio access technology spectrum sharing (MRSS) inter-radio access technology handover is applied (508a).
  • MRSS multi-radio access technology spectrum sharing
  • the indication (508a) of the multi-radio access technology spectrum sharing (MRSS) inter-radio access technology handover is one of downlink control (DL) information based or medium access control (MAC) control element based.
  • the indication (508a) received from the first network node (112) includes: a new cell radio network temporary identifier (C-RNTI) (506b).
  • C-RNTI new cell radio network temporary identifier
  • the first network node (112) of the first radio access technology and the second network node (114) of the second radio access technology are either collocated or non-collocated; wherein at least one of the first radio access technology or the second radio access technology includes a 5G radio access technology, and at least one of the first radio access technology or the second radio access technology includes a 6G radio access technology.
  • at least one of an uplink multiple-input, multiple-output (MIMO) scheme or an uplink transmission configuration indicator (TCI) state is maintained when a common beam is used for the first random access technology and the second random access technology.
  • MIMO multiple-input, multiple-output
  • TCI uplink transmission configuration indicator
  • the apparatus embodied by the user equipment (110) includes means, such as the processing circuitry (220), the communication interface (260), the like, for performing an access to the second network node via at least one or both of: a random access channel-less procedure (520) or maintaining an uplink (UL) timing adjustment during the inter-radio access technology handover procedure, when it is determined that the received indication (508a) indicates that the user equipment is to apply the multi-radio access technology spectrum sharing (MRSS) inter- radio access technology handover.
  • MRSS multi-radio access technology spectrum sharing
  • the user equipment (110) further includes means for receiving, from the first network node (112), a resources configuration (510a) that schedules resources (512a/512b) to be received from one of: the first network node (112) or the second network node (114).
  • the resources configuration (510a) configures the user equipment to perform at least one of: receive at least a first portion of the scheduled resources (PDSCH) (512a/512b) that are carried in one of: the first radio access technology or the second radio access technology; or activate at least a second portion of the scheduled resources (PDSCH) (512a/512b) that are pre- configured in one of: the first radio access technology or the second radio access technology.
  • the user equipment (110) further includes means for receiving (512), from one of the first network node (112) or the second network node (114), a cell-specific configuration of the second network node (114), wherein the cell-specific configuration is acquired from the scheduled resources (PDSCH) (512a/512b).
  • the uplink timing adjustment is based at least on a latest timing advance command received from the first network node.
  • the user equipment (110) further includes means for transmitting (514), to one of the first network node (112) or the second network node (114), a scheduled resources (PDSCH) acknowledgment (514a/514b) to indicate whether the multi-radio access technology spectrum sharing (MRSS) inter-radio access technology handover is successful or not.
  • the user equipment (110) further includes means for applying at least part of an uplink power control related configuration of the first network node to the second network node, wherein the uplink power control related configuration includes at least one of: a first parameter for closed-loop power control or a second parameter for open-loop power control.
  • the resources configuration (510a) includes physical layer parameters for the scheduled resources (PDSCH) (512a/512b).
  • FIG. 11 an example flowchart is illustrated for a process 1100 performed by an apparatus embodied by, associated with or otherwise in communication with (hereinafter generally referenced as being embodied by) a first network node (112) in order to indicate that a random access channel-less procedure should be performed or an uplink timing adjustment should be maintained in accordance with example embodiments of the present disclosure.
  • the apparatus embodied by the first network node (112) includes means, such as the processing circuitry (220), the communication interface (260), the like, for transmitting (504), to a second network node (114), a handover request (504a) including an indication (508a) to apply a multi- radio access technology spectrum sharing (MRSS) inter-radio access technology handover, wherein the handover request (504a) indicates whether a new cell radio network temporary identifier (C-RNTI) (506b) is needed, and wherein the multi-radio access technology spectrum sharing (MRSS) inter- radio access technology handover takes place between the first network node (112) of a first radio access technology and the second network node (114) of a second radio access technology, wherein the first radio access technology is different from the second radio access technology.
  • MRSS multi- radio access technology spectrum sharing
  • the indication (508a) to apply the multi-radio access technology spectrum sharing (MRSS) inter-radio access technology handover includes: the new cell radio network temporary identifier (C-RNTI) (506b).
  • the handover request (504a) indicates a handover reason as inter-radio access technology handover multi-radio access technology spectrum sharing
  • the handover request does not include the new cell radio network temporary identifier (C-RNTI) (506b).
  • the indication (508a) to apply the multi-radio access technology spectrum sharing (MRSS) interradio access technology handover includes the new cell radio network temporary identifier (506b).
  • at least one of the first radio access technology or the second radio access technology includes a 5G radio access technology, and wherein at least one of the first radio access technology or the second radio access technology includes a 6G radio access technology.
  • at least one of an uplink multiple- input, multiple-output (MIMO) scheme or an uplink transmission configuration indicator (TCI) state is maintained when a common beam is used for the first random access technology and the second random access technology.
  • MIMO uplink multiple- input, multiple-output
  • TCI uplink transmission configuration indicator
  • the apparatus embodied by the first network node (112) includes means, such as the processing circuitry (220), the communication interface (260), the like, for transmitting (508), to a user equipment (110), the indication (508a) to apply the multi-radio access technology spectrum sharing (MRSS) inter-radio access technology handover, wherein the indication further indicates to perform an initial access to the second network node via at least one or both of: a random access channel-less procedure (520) or maintaining an uplink (UL) timing adjustment during the inter- radio access technology handover procedure.
  • MRSS multi-radio access technology spectrum sharing
  • the indication (508a) to apply the multi-radio access technology spectrum sharing (MRSS) inter- radio access technology handover is one of downlink control information based or medium access control (MAC) control element based.
  • the uplink timing adjustment is based at least on a latest timing advance command received from the first network node.
  • the apparatus embodied by the first network node (112) includes means, such as the processing circuitry (220), the communication interface (260), the like, for transmitting (510), to the user equipment (110), a resources configuration (510a) that schedules resources (512a/512b) to be received by the user equipment from one of: the first network node (112) or the second network node (114).
  • means such as the processing circuitry (220), the communication interface (260), the like, for transmitting (510), to the user equipment (110), a resources configuration (510a) that schedules resources (512a/512b) to be received by the user equipment from one of: the first network node (112) or the second network node (114).
  • the first network node (112) further includes means for performing one or more of: receive (506), from the second network node (114), a handover request confirmation (506a); transmit the handover request (504a) in response to an energy efficiency determination (502); transmit, to the user equipment (110) or the second network node (114), the scheduled resources (512a); transmit (512), to the user equipment (110), a cell-specific configuration of the second network node (114), wherein the cell-specific configuration is acquired from the scheduled resources (PDSCH) (512a); or receive (514), from the user equipment (110), a scheduled resources (PDSCH) acknowledgment (514a).
  • the first network node (112) further includes means for causing the user equipment (110) to apply at least part of an uplink power control related configuration of the first network node to the second network node, wherein the uplink power control related configuration includes at least one of: a first parameter for closed- loop power control or a second parameter for open-loop power control.
  • the resources configuration (510a) includes physical layer parameters for the scheduled resources (512a/512b).
  • FIGS. 6-11 illustrate flowcharts depicting methods according to an example embodiment of the present disclosure. It will be understood that each block of the flowcharts and combination of blocks in the flowcharts may be implemented by various means, such as hardware, firmware, processor, circuitry, and/or other communication devices associated with execution of software including one or more computer program instructions. For example, one or more of the procedures described above may be embodied by computer program instructions. In this regard, the computer program instructions which embody the procedures described above may be stored by a memory device 240 of an apparatus employing an embodiment and executed by a processor 220.
  • any such computer program instructions may be loaded into a computer or other programmable apparatus (for example, hardware) to produce a machine, such that the resulting computer or other programmable apparatus implements the functions specified in the flowchart blocks.
  • These computer program instructions may also be stored in a computer-readable memory that may direct a computer or other programmable apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture the execution of which implements the function specified in the flowchart blocks.
  • the computer program instructions may also be loaded into a computer or other programmable apparatus to cause a series of operations to be performed on the computer or other programmable apparatus to produce a computer-implemented process such that the instructions which execute on the computer or other programmable apparatus provide operations for implementing the functions specified in the flowchart blocks.
  • blocks of the flowcharts support combinations of means for performing the specified functions and combinations of operations for performing the specified functions for performing the specified functions. It will also be understood that one or more blocks of the flowcharts, and combinations of blocks in the flowcharts, may be implemented by special purpose hardware-based computer systems which perform the specified functions, or combinations of special purpose hardware and computer instructions.
  • a user equipment (110) including at least one processor and at least one memory storing instructions thereon that, when executed by the at least one processor, cause the user equipment (110) to receive (508), from a first network node (112), an indication (508a) of an inter-radio access technology handover (inter-RAT HO) from the first network node (112) of a first radio access technology to a second network node (114) of a second radio access technology, wherein the first radio access technology is different from the second radio access technology, and wherein the indication indicates that multi-radio access technology spectrum sharing (MRSS) inter-radio access technology handover is applied (508a).
  • inter-RAT HO inter-radio access technology handover
  • MRSS multi-radio access technology spectrum sharing
  • the user equipment (110) is further caused to perform an access to the second network node via at least one or both of: a random access channel-less procedure (520) or maintaining an uplink (UL) timing adjustment during the inter-radio access technology handover procedure, when it is determined that the received indication (508a) indicates that the user equipment is to apply the multi-radio access technology spectrum sharing (MRSS) inter-radio access technology handover.
  • the user equipment (110) is further caused to receive, from the first network node (112), a resources configuration (510a) that schedules resources (512a/512b) to be received from one of: the first network node (112) or the second network node (H4).
  • the resources configuration (510a) configures the user equipment to perform at least one of: receive at least a first portion of the scheduled resources (PDSCH) (512a/512b) that are carried in one of: the first radio access technology or the second radio access technology; or activate at least a second portion of the scheduled resources (PDSCH) (512a/512b) that are pre-configured in one of: the first radio access technology or the second radio access technology.
  • the user equipment (110) is further caused to receive (512), from one of the first network node (112) or the second network node (114), a cell-specific configuration of the second network node (114), wherein the cell-specific configuration is acquired from the scheduled resources (PDSCH) (512a/512b).
  • PDSCH scheduled resources
  • the indication (508a) of the multi- radio access technology spectrum sharing (MRSS) inter- radio access technology handover is one of downlink control (DL) information based or medium access control (MAC) control element based.
  • DL downlink control
  • MAC medium access control
  • the indication (508a) received from the first network node (112) includes: a new cell radio network temporary identifier (C-RNH) (506b).
  • C-RNH new cell radio network temporary identifier
  • the uplink timing adjustment is based at least on a latest timing advance command received from the first network node.
  • the user equipment (110) is further caused to transmit (514), to one of the first network node (112) or the second network node (114), a scheduled resources (PDSCH) acknowledgment (514a/514b) to indicate whether the multi-radio access technology spectrum sharing (MRSS) inter- radio access technology handover is successful or not.
  • PDSCH scheduled resources
  • the first network node (112) of the first radio access technology and the second network node (114) of the second radio access technology are either collocated or non-collocated, wherein at least one of the first radio access technology or the second radio access technology includes a 5G radio access technology, and at least one of the first radio access technology or the second radio access technology includes a 6G radio access technology.
  • the user equipment (110) is further caused to apply at least part of an uplink power control related configuration of the first network node to the second network node, wherein the uplink power control related configuration includes at least one of: a first parameter for closed-loop power control or a second parameter for open-loop power control.
  • the uplink power control related configuration includes at least one of: a first parameter for closed-loop power control or a second parameter for open-loop power control.
  • at least one of an uplink multiple-input, multiple-output (MIMO) scheme or an uplink transmission configuration indicator (TCI) state is maintained when a common beam is used for the first random access technology and the second random access technology.
  • MIMO multiple-input, multiple-output
  • TCI uplink transmission configuration indicator
  • the resources configuration (510a) includes physical layer parameters for the scheduled resources (PDSCH) (512a/512b).
  • a first network node (112) including at least one processor and at least one memory storing instructions thereon that, when executed by the at least one processor, cause the first network node (112) to transmit (504), to a second network node (114), a handover request (504a) including an indication (508a) to apply a multi-radio access technology spectrum sharing (MRSS) inter-radio access technology handover, wherein the handover request (504a) indicates whether a new cell radio network temporary identifier (C- RNTI) (506b) is needed, and wherein the multi-radio access technology spectrum sharing (MRSS) inter-radio access technology handover takes place between the first network node (112) of a first radio access technology and the second network node (114) of a second radio access technology, wherein the first radio access technology is different from the second radio access technology.
  • MRSS multi-radio access technology spectrum sharing
  • the first network node (112) is further caused to transmit (508), to a user equipment (110), the indication (508a) to apply the multi-radio access technology spectrum sharing (MRSS) inter-radio access technology handover, wherein the indication further indicates to perform an initial access to the second network node via at least one or both of: a random access channelless procedure (520) or maintaining an uplink (UL) timing adjustment during the inter-radio access technology handover procedure.
  • the first network node (112) is further caused to transmit (510), to the user equipment (110), a resources configuration (510a) that schedules resources (512a/512b) to be received by the user equipment from one of: the first network node (112) or the second network node (114).
  • the indication (508a) to apply the multi-radio access technology spectrum sharing (MRSS) inter- radio access technology handover includes: the new cell radio network temporary identifier (C-RNU) (506b).
  • the first network node (112) further receives (506), from the second network node (114), a handover request confirmation (506a). Additionally or alternatively, the first network node (112) transmits the handover request (504a) in response to an energy efficiency determination (502). Additionally or alternatively, the first network node (112) transmits, to the user equipment (110) or the second network node (114), the scheduled resources (512a). Additionally or alternatively, the first network node (112) transmits (512), to the user equipment (110), a cell-specific configuration of the second network node (114), wherein the cell-specific configuration is acquired from the scheduled resources (PDSCH) (512a). Additionally or alternatively, the first network node (112) receives (514), from the user equipment (110), a scheduled resources (PDSCH) acknowledgment (514a).
  • the handover request when the handover request (504a) indicates a handover reason as inter-radio access technology handover multi-radio access technology spectrum sharing, the handover request does not include the new cell radio network temporary identifier (C-RNTI) (506b).
  • C-RNTI new cell radio network temporary identifier
  • the indication (508a) to apply the multi-radio access technology spectrum sharing (MRSS) inter- radio access technology handover is one of downlink control information based or medium access control (MAC) control element based.
  • the indication (508a) to apply the multi- radio access technology spectrum sharing (MRSS) inter-radio access technology handover includes the new cell radio network temporary identifier (506b).
  • MRSS multi- radio access technology spectrum sharing
  • the uplink timing adjustment is based at least on a latest timing advance command received from the first network node.
  • the first network node (112) of the first radio access technology and the second network node (114) of the second radio access technology are either collocated or non-collocated; wherein at least one of the first radio access technology or the second radio access technology includes a 5G radio access technology, and at least one of the first radio access technology or the second radio access technology includes a 6G radio access technology.
  • the first network node (112) is further caused to cause the user equipment (110) to apply at least part of an uplink power control related configuration of the first network node to the second network node, wherein the uplink power control related configuration includes at least one of: a first parameter for closed-loop power control or a second parameter for open-loop power control.
  • At least one of an uplink multiple-input, multiple-output (MIMO) scheme or an uplink transmission configuration indicator (TCI) state is maintained when a common beam is used for the first random access technology and the second random access technology.
  • MIMO multiple-input, multiple-output
  • TCI uplink transmission configuration indicator
  • the resources configuration (510a) includes physical layer parameters for the scheduled resources (512a/512b).
  • a user equipment (110) includes means for receiving (508), from a first network node (112), an indication (508a) of an inter-radio access technology handover (inter-RAT HO) from the first network node (112) of a first radio access technology to a second network node (114) of a second radio access technology, wherein the first radio access technology is different from the second radio access technology, and wherein the indication indicates that multi-radio access technology spectrum sharing (MRSS) inter-radio access technology handover is applied (508a).
  • inter-RAT HO inter-radio access technology handover
  • MRSS multi-radio access technology spectrum sharing
  • the user equipment (110) further includes means for performing an access to the second network node via at least one or both of: a random access channel-less procedure (520) or maintaining an uplink (UL) timing adjustment during the interradio access technology handover procedure, when it is determined that the received indication (508a) indicates that the user equipment is to apply the multi-radio access technology spectrum sharing (MRSS) inter-radio access technology handover.
  • a random access channel-less procedure 520
  • UL uplink
  • a first network node (112) includes means for transmitting (504), to a second network node (114), a handover request (504a) including an indication (508a) to apply a multi-radio access technology spectrum sharing (MRSS) inter-radio access technology handover, wherein the handover request (504a) indicates whether a new cell radio network temporary identifier (C-RNU) (506b) is needed, and wherein the multi- radio access technology spectrum sharing (MRSS) inter-radio access technology handover takes place between the first network node (112) of a first radio access technology and the second network node (114) of a second radio access technology, wherein the first radio access technology is different from the second radio access technology.
  • MRSS multi-radio access technology spectrum sharing
  • the first network node (112) further includes means for transmitting (508), to a user equipment (110), the indication (508a) to apply the multiradio access technology spectrum sharing (MRSS) inter-radio access technology handover, wherein the indication further indicates to perform an initial access to the second network node via at least one or both of: a random access channel-less procedure (520) or maintaining an uplink (UL) timing adjustment during the inter- radio access technology handover procedure.
  • the first network node (112) further includes means for transmitting (510), to the user equipment (110), a resources configuration (510a) that schedules resources (512a/512b) to be received by the user equipment from one of: the first network node (112) or the second network node (114).
  • a computer-implemented method is performed by a user equipment (110) and includes receiving (508), from a first network node (112), an indication (508a) of an inter-radio access technology handover (inter-RAT HO) from the first network node (112) of a first radio access technology to a second network node (114) of a second radio access technology, wherein the first radio access technology is different from the second radio access technology, and wherein the indication indicates that multi-radio access technology spectrum sharing (MRSS) inter-radio access technology handover is applied (508a).
  • inter-RAT HO inter-radio access technology handover
  • MRSS multi-radio access technology spectrum sharing
  • the method includes means for performing an access to the second network node via at least one or both of: a random access channel-less procedure (520) or maintaining an uplink (UL) timing adjustment during the inter-radio access technology handover procedure, when it is determined that the received indication (508a) indicates that the user equipment is to apply the multi-radio access technology spectrum sharing (MRSS) inter-radio access technology handover.
  • a random access channel-less procedure 520
  • UL uplink
  • a computer-implemented method is performed by a first network node (112) and includes transmitting (504), to a second network node (114), a handover request (504a) including an indication (508a) to apply a multi-radio access technology spectrum sharing (MRSS) inter-radio access technology handover, wherein the handover request (504a) indicates whether a new cell radio network temporary identifier (C- RNTI) (506b) is needed, and wherein the multi-radio access technology spectrum sharing (MRSS) inter-radio access technology handover takes place between the first network node (112) of a first radio access technology and the second network node (114) of a second radio access technology, wherein the first radio access technology is different from the second radio access technology.
  • MRSS multi-radio access technology spectrum sharing
  • the method further includes transmitting (508), to a user equipment (110), the indication (508a) to apply the multi-radio access technology spectrum sharing (MRSS) interradio access technology handover, wherein the indication further indicates to perform an initial access to the second network node via at least one or both of: a random access channel-less procedure (520) or maintaining an uplink (UL) timing adjustment during the inter-radio access technology handover procedure.
  • the method further includes transmitting (510), to the user equipment (110), a resources configuration (510a) that schedules resources (512a/512b) to be received by the user equipment from one of: the first network node (112) or the second network node (114).
  • a non-transitory computer readable storage medium including computer instructions that, when executed by a user equipment (110), cause the user equipment (110) to receive (508), from a first network node (112), an indication (508a) of an inter-radio access technology handover (inter-RAT HO) from the first network node (112) of a first radio access technology to a second network node (114) of a second radio access technology, wherein the first radio access technology is different from the second radio access technology, and wherein the indication indicates that multi-radio access technology spectrum sharing (MRSS) inter-radio access technology handover is applied (508a).
  • MRSS multi-radio access technology spectrum sharing
  • the user equipment (110) is further caused to perform an access to the second network node via at least one or both of: a random access channel-less procedure (520) or maintaining an uplink (UL) timing adjustment during the inter-radio access technology handover procedure, when it is determined that the received indication (508a) indicates that the user equipment is to apply the multi-radio access technology spectrum sharing (MRSS) inter-radio access technology handover.
  • a random access channel-less procedure 520
  • UL uplink
  • a non-transitory computer readable storage medium including computer instructions that, when executed by a first network node (112), cause the first network node (112) to transmit (504), to a second network node (114), a handover request (504a) including an indication (508a) to apply a multi-radio access technology spectrum sharing (MRSS) inter-radio access technology handover, wherein the handover request (504a) indicates whether a new cell radio network temporary identifier (C-RNU) (506b) is needed, and wherein the multi-radio access technology spectrum sharing (MRSS) inter-radio access technology handover takes place between the first network node (112) of a first radio access technology and the second network node (114) of a second radio access technology, wherein the first radio access technology is different from the second radio access technology.
  • MRSS multi-radio access technology spectrum sharing
  • the first network node (112) is further caused to transmit (508), to a user equipment (110), the indication (508a) to apply the multi -radio access technology spectrum sharing (MRSS) inter-radio access technology handover, wherein the indication further indicates to perform an initial access to the second network node via at least one or both of: a random access channel-less procedure (520) or maintaining an uplink (UL) timing adjustment during the inter-radio access technology handover procedure.
  • the first network node (112) is further caused to transmit (510), to the user equipment (110), a resources configuration (510a) that schedules resources (512a/512b) to be received by the user equipment from one of: the first network node (112) or the second network node (114).

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

L'invention concerne un procédé, un appareil et un produit de programme informatique. Dans le contexte d'un procédé, le procédé consiste à recevoir, en provenance d'un premier nœud de réseau, une indication d'un transfert inter-technologie d'accès radio (RAT) du premier nœud de réseau d'une première RAT à un second nœud de réseau d'une seconde RAT, la première RAT étant différente de la seconde RAT, et l'indication indiquant que le transfert inter-RAT de partage de spectre multi-RAT (MRSS) est appliqué. Le procédé consiste en outre à réaliser un accès au second nœud de réseau par l'intermédiaire d'au moins l'une ou les deux parmi : une procédure sans canal d'accès aléatoire (RACH) ou le maintien d'un réglage de synchronisation de liaison montante pendant la procédure de transfert inter-RAT, lorsqu'il est déterminé que l'indication reçue indique que l'équipement utilisateur doit appliquer le transfert inter-RAT MRSS.
PCT/EP2024/068356 2024-06-28 2024-06-28 Procédé pour améliorer la mobilité pour déploiement de mrss Pending WO2026002402A1 (fr)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20150271723A1 (en) * 2014-03-20 2015-09-24 Qualcomm Incorporated Uplink timing advance adjustment
US20170251445A1 (en) * 2014-11-14 2017-08-31 Huawei Technologies Co., Ltd. Network node, user device and methods thereof
WO2023208737A1 (fr) * 2022-04-25 2023-11-02 Continental Automotive Technologies GmbH Système, procédés, équipement utilisateur et stations de base pour une communication sans fil dans un réseau non terrestre
WO2024092600A1 (fr) * 2022-11-03 2024-05-10 Qualcomm Incorporated Procédures de transfert intercellulaire de couche 1 et de couche 2

Patent Citations (4)

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Publication number Priority date Publication date Assignee Title
US20150271723A1 (en) * 2014-03-20 2015-09-24 Qualcomm Incorporated Uplink timing advance adjustment
US20170251445A1 (en) * 2014-11-14 2017-08-31 Huawei Technologies Co., Ltd. Network node, user device and methods thereof
WO2023208737A1 (fr) * 2022-04-25 2023-11-02 Continental Automotive Technologies GmbH Système, procédés, équipement utilisateur et stations de base pour une communication sans fil dans un réseau non terrestre
WO2024092600A1 (fr) * 2022-11-03 2024-05-10 Qualcomm Incorporated Procédures de transfert intercellulaire de couche 1 et de couche 2

Non-Patent Citations (1)

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Title
PARKVALL STEFAN ET AL: "Future 6G radio-access network & design choices - Ericsson", ERICSSON.COM, 15 May 2024 (2024-05-15), pages 1 - 13, XP093235663, Retrieved from the Internet <URL:https://web.archive.org/web/20240530055307/https://www.ericsson.com/en/blog/2024/5/future-6g-radio-access-network-design-choices> [retrieved on 20241219] *

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