WO2024113907A9 - Procédé et appareil de prise en charge de transmissions de synchronisation - Google Patents

Procédé et appareil de prise en charge de transmissions de synchronisation Download PDF

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Publication number
WO2024113907A9
WO2024113907A9 PCT/CN2023/109107 CN2023109107W WO2024113907A9 WO 2024113907 A9 WO2024113907 A9 WO 2024113907A9 CN 2023109107 W CN2023109107 W CN 2023109107W WO 2024113907 A9 WO2024113907 A9 WO 2024113907A9
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WO
WIPO (PCT)
Prior art keywords
synchronization
information
ran node
pdu
transmission set
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PCT/CN2023/109107
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English (en)
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WO2024113907A1 (fr
Inventor
Mingzeng Dai
Xiaoying Xu
Congchi ZHANG
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Lenovo (Beijing) Limited
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Application filed by Lenovo (Beijing) Limited filed Critical Lenovo (Beijing) Limited
Priority to PCT/CN2023/109107 priority Critical patent/WO2024113907A1/fr
Priority claimed from PCT/CN2023/109107 external-priority patent/WO2024113907A1/fr
Publication of WO2024113907A1 publication Critical patent/WO2024113907A1/fr
Publication of WO2024113907A9 publication Critical patent/WO2024113907A9/fr

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  • the present disclosure relates to wireless communications, and more specifically to technique of supporting synchronization transmissions.
  • a wireless communication system may include one or multiple network communication devices, such as base stations, which may support wireless communications for one or multiple user communication devices, which may be otherwise known as user equipment (UE) , or other suitable terminology.
  • the wireless communication system may support wireless communications with one or multiple user communication devices by utilizing resources of the wireless communication system (e.g., time resources (e.g., symbols, slots, subframes, frames, or the like) or frequency resources (e.g., subcarriers, carriers, or the like) .
  • the wireless communication system may support wireless communications across various radio access technologies including third generation (3G) radio access technology, fourth generation (4G) radio access technology, fifth generation (5G) radio access technology, among other suitable radio access technologies beyond 5G (e.g., sixth generation (6G) ) .
  • the phrase “based on” shall not be construed as a reference to a closed set of conditions. For example, an example step that is described as “based on condition A” may be based on both a condition A and a condition B without departing from the scope of the present disclosure. In other words, as used herein, the phrase “based on” shall be construed in the same manner as the phrase “based at least in part on. Further, as used herein, including in the claims, a “set” may include one or more elements.
  • Some implementations of the methods and apparatuses described herein may include a radio access network (RAN) node for wireless communication, wherein the RAN node includes: at least one memory; and at least one processor coupled with the at least one memory and configured to cause the RAN node to: receive first synchronization association information of quality of service (QoS) flows and a first synchronization threshold information of a first synchronization transmission set from a core network (CN) via control plane signaling, wherein the first synchronization transmission set is a set of packets crossing multiple QoS flows that needs synchronization transmission; receive first synchronization identification information of the first synchronization transmission set from the CN via user plane protocol; and perform transmission of the first synchronization transmission set to a user equipment (UE) according to the first synchronization association information, the first synchronization threshold information and the first synchronization identification information.
  • QoS quality of service
  • CN core network
  • CN core network
  • the first synchronization transmission set is a set of packets crossing multiple QoS
  • the first synchronization association information of QoS flows indicates QoS flows that need synchronization transmission by indicating QoS flow identifiers (QFIs) of the QoS flows; or indicating that the QoS flows belong to a same multi-modal service.
  • QFIs QoS flow identifiers
  • the first synchronization association information of QoS flows further indicates identification information of the different PDU sessions.
  • the first synchronization threshold information indicates one or multiple first synchronization thresholds, and each first synchronization threshold indicates time or latency that the synchronization transmission needs to be satisfied.
  • each first synchronization threshold indicates a delay requirement between PDUs of different QoS flows, or a delay requirement between PDU sets of different QoS flows, or a delay requirement between PDUs and PDU sets of different QoS flows.
  • the at least one processor is configured to cause the RAN node to: receive the first synchronization association information of QoS flows and the first synchronization threshold information in a PDU session resource setup request message or PDU session resource modify request message.
  • the first synchronization identification information indicates sequence number information of PDU sets of each corresponding QoS flow belonging to the first synchronization transmission set by respective PDU set sequence numbers and/or PDU set sequence number ranges; and/or in the case that the first synchronization transmission set includes PDUs from one or more of the multiple QoS flows, the first synchronization identification information indicates sequence number information of PDUs of each corresponding QoS flow belonging to the first synchronization transmission set by respective PDU sequence numbers and/or PDU sequence number ranges.
  • the at least one processor is configured to cause the RAN node to: receive the first synchronization identification information of the first synchronization transmission set in a GTP-U extension header of each PDU and/or PDU set of the first synchronization transmission set.
  • the first synchronization identification information indicates a synchronization number, and each PDU and/or PDU set of the first synchronization transmission set has a same synchronization number.
  • the RAN node is a source RAN node
  • the at least one processor is configured to cause the RAN node to: transmit the first synchronization association information of QoS flows and the first synchronization threshold information to a target RAN node in a handover request message.
  • the at least one processor is configured to cause the RAN node to: transmit remaining synchronization time information of the first synchronization transmission set of forwarded data to the target RAN node, wherein the remaining synchronization time information indicates arrival time information of a first PDU or first PDU set of the first synchronization transmission set.
  • the arrival time information of the first PDU or first PDU set of the first synchronization transmission set indicates: absolute time of the first PDU or first PDU set of the first synchronization transmission set arriving at the RAN node from the CN; system frame number (SFN) timing that represents arrival time of the first PDU or first PDU set of the first synchronization transmission set at RAN side; and/or buffered time of the first PDU or first PDU set of the first synchronization transmission set.
  • SFN system frame number
  • the at least one processor is configured to cause the RAN node to: transmit an SFN timing in the source RAN node to the target RAN node; or calculate an SFN timing in the target RAN node according to the SFN timing in the source RAN node, and transmit the SFN timing in the target RAN node to the target RAN node.
  • the at least one processor is configured to cause the RAN node to: calculate past synchronization time according to time indicated by arrival time information of a first PDU or first PDU set of the first synchronization transmission set; calculate remaining synchronization time according to the first synchronization threshold information and the past synchronization time; and transmit remaining synchronization time information of the first synchronization transmission set of forwarded data to the target RAN node, wherein the remaining synchronization time information indicates the calculated remaining synchronization time.
  • the at least one processor is configured to cause the RAN node to: indicate which QoS flow's PDU or PDU set first arriving at the source RAN node to the target RAN node in the case that the first synchronization threshold information indicates one or more first synchronization thresholds.
  • the first synchronization identification information indicates sequence number information of PDU sets of each corresponding QoS flow belonging to the first synchronization transmission set by respective PDU set sequence numbers and/or PDU set sequence number ranges; and/or in the case that the first synchronization transmission set includes PDUs from one or more of the multiple QoS flows, the first synchronization identification information indicates sequence number information of PDUs of each corresponding QoS flow belonging to the first synchronization transmission set by respective PDU sequence numbers and/or PDU sequence number ranges.
  • each second synchronization threshold indicates a delay requirement between PDUs of different DRBs, or a delay requirement between PDU sets of different DRBs, or a delay requirement between PDUs and PDU sets of different DRBs.
  • a PDU SN is a downlink QFI sequence number.
  • the present disclosure solves the technical problem of supporting synchronization transmissions for multi-modal communication service or the like in various scenarios. Accordingly, the present disclosure will facilitate the implementation of multi-modal communication service or the like in NR, which will support applications enabling input from more than one sources and/or output to more than one destinations to convey information more effectively.
  • the gNB will also receive synchronization threshold information of a synchronization transmission set, e.g., Set 1 or Set 2 from the CN via control plane signaling, wherein the synchronization transmission set is a set of packets crossing multiple QoS flows that need synchronization transmission, which is referred to as a first synchronization transmission set for simplification and clearness.
  • the multiple QoS flows are partial or all of the two or more QoS flows indicated in the first synchronization association information.
  • first synchronization transmission set it may include only PDUs from different QoS flows that need synchronization transmission, e.g., one or more PDUs from a first QoS flow (e.g., a video QoS flow) and one or more PDUs from a second QoS flow (e.g., an audio QoS flow) ; or PDUs and PDU sets from different QoS flows that need synchronization transmission, e.g., one or more PDU sets of a first QoS flow and one or more PDUs of a second QoS flow; or only PDU sets from different QoS flows that need synchronization transmission, e.g., one or more PDU sets of a first QoS flow and one or more PDU sets of a second QoS flow. Both the first QoS flow and second QoS flow are indicated in the first synchronization association information.
  • first QoS flow and second QoS flow are indicated in the first synchronization association information.
  • the PDU set or PDU may also be a data burst.
  • a data burst it is a set of multiple PDUs generated and sent by applications in a short period of time.
  • a data burst may be composed by one or multiple PDU sets in some cases.
  • the first synchronization threshold information indicates one or multiple first synchronization thresholds for the first synchronization transmission set, wherein, each first synchronization threshold indicates time or latency that the synchronization transmission needs to be satisfied.
  • An exemplary first synchronization threshold may indicate a delay requirement between PDUs of different QoS flows for a first synchronization transmission set, or a delay requirement between PDU sets of different QoS flows for a first synchronization transmission set, or a delay requirement between PDUs and PDU sets of different QoS flows for a first synchronization transmission set.
  • the different first synchronization thresholds are defined based on the first transmitted PDU or PDU set of the different QoS flows in the first synchronization transmission set, or based on the first received PDU or PDU set of the different QoS flows in the first synchronization transmission set.
  • Figure 6 illustrates an example of first synchronization identification information in accordance with aspects of the present disclosure.
  • the (first) synchronization transmission set includes one or more PDU sets from QoS flow 1 and one or more PDU sets from QoS flow 2. Accordingly, the first synchronization identification information will indicate PDU set SN (s) and/or PDU set SN range (s) of QoS flow 1 and QoS flow 2.
  • a PDU sequence number may be a downlink (DL) QFI sequence number, as assigned by the UPF associated with a given QoS Flow as "PDU Session Container" GTP-U extension header as defined in 3GPP TS 38.415 or the GTP-U sequence number in the GTP-U header.
  • Figure 7 illustrates an example of carrying first synchronization identification information in the GTP-U extension header of each PDU and/or PDU set of a first synchronization transmission set in accordance with aspects of the present disclosure.
  • a first synchronization transmission set 700 includes multiple PDU sets of a video QoS flow, e.g., PDU SET 1-PDU Set 4 and multiple PDUs of an audio QoS flow, e.g., PDU 1-PDU 4.
  • the first synchronization identification information e.g., SYNC, is a synchronization number. Then, the same synchronization number will be added in each GTP-U extension header of PDU SETs 1-4 and PDUs 1-4.
  • the gNB Based on the first synchronization association information, the first synchronization threshold information and the first synchronization identification information, the gNB will be aware of the synchronization transmission of dependent PDU(s) and/or PDU set (s) among the QoS flows, which belong to the first synchronization transmission set. In step 305, the gNB will perform transmission of the first synchronization transmission set to the UE according to the first synchronization association information, the first synchronization threshold information and the first synchronization identification information.
  • the UE may be handed over from the RAN node as illustrated in view of figures 3-7 to another RAN node e.g., gNB. Then, issue 2 needs to be solved to support synchronization transmissions for multi-modal communication services.
  • Figure 8 illustrates an example of a procedure of supporting synchronization transmission in accordance with aspects of the present disclosure, wherein issue 2 is mainly considered.
  • a source RAN node e.g., a source gNB and a target RAN node, e.g., a target gNB
  • the method implemented in the source RAN node and the target RAN node can be separately implemented and/or incorporated by other apparatus with the like functions.
  • the RAN node illustrated in views of figures 3-7 acts as the source RAN node in figure 8, that is, the source RAN node has the first synchronization association information, the first synchronization threshold information and the first synchronization identification information; and is aware of the first synchronization transmission set.
  • the implementations of the methods and apparatuses described in view of figure 8 focus on Xn-AP handover.
  • the source gNB will also send the first synchronization threshold information to the target gNB, e.g., also in the handover request message.
  • the source gNB will not calculate remaining synchronization time while send the arrival time information of the first PDU or first PDU set in the first synchronization transmission set to the target gNB. Accordingly, the target gNB will determine the remaining synchronization time based on the arrival time information of the first PDU or first PDU set in the first synchronization transmission set in step 805a. For example, the target gNB will calculate the past synchronization time (or past synchronization transmission time) of the first synchronization transmission set according to the time indicated by the arrival time information of the first PDU or first PDU set.
  • the target gNB will calculate the remaining synchronization time according to the first synchronization threshold information and the past synchronization time of the first synchronization transmission set, e.g., the remaining synchronization time being the corresponding first synchronization threshold minus the past synchronization time.
  • Exemplary arrival time information of the first PDU or PDU set of the first synchronization transmission set may be the absolute time, e.g., universal time coordinated (UTC) time, of the first PDU or first PDU set of the first synchronization transmission set arriving at the source gNB from the CN, e.g., from the UPF.
  • UPF universal time coordinated
  • the source gNB will determine or calculate the SFN timing in the target gNB and send the SFN timing in the target gNB to the target gNB.
  • the source gNB will send the SFN timing in the source gNB to the target gNB, and the target gNB will determine or calculate the SFN timing in the target gNB.
  • the source gNB may send the SFN timing in the source gNB and may optionally send the SFN offset between the source gNB and target gNB to the target gNB.
  • the target will calculate the SFN timing in the target gNB according to the SFN timing in the source gNB and the SFN offset between the source gNB and target gNB (from the source gNB or determined by the target gNB itself) .
  • the source gNB in the case that there is an SFN offset between the source RAN node and the target RAN node, the source gNB will calculate the SFN timing in the target gNB according to the SFN timing in the source gNB and the SFN offset between the source gNB and target gNB and send the SFN timing in the target gNB to the target gNB.
  • Yet another exemplary arrival time information of the first PDU or PDU set of the first synchronization transmission set may be the buffered time of the first PDU or first PDU set of the first synchronization transmission set.
  • the buffered time of the first PDU or first PDU set of the first synchronization transmission set may be how long the first PDU or first PDU set has been buffered in the source gNB until the source gNB sends the arrival time information of the first PDU or first PDU set to the target gNB.
  • the source gNB will calculate the remaining synchronization time in step 805b and send the calculated remaining synchronization time to the target gNB in step 803. For example, the source gNB will calculate the past synchronization time according to the time indicated by the arrival time information of the first PDU or first PDU set of the first synchronization transmission set. Then, the source gNB will calculate the remaining synchronization time according to the first synchronization threshold information and the past synchronization time, e.g., the remaining synchronization time being the corresponding first synchronization threshold minus the past synchronization time. The source gNB will send the remaining synchronization time of the first synchronization set of forwarded data to the target gNB during the handover procedure.
  • the source gNB may also send which QoS flow's PDU or PDU set first arrives at RAN side to the target gNB, so that the target gNB will determine which first synchronization threshold will be used. For example, for the first synchronization threshold information as shown in figure 4, if PDU B of QoS Y first arrives, then the first synchronization threshold corresponding to the time zone 403 will be used.
  • the source gNB will also transmit the first synchronization identification information to the target gNB.
  • the source gNB will provide the first synchronization identification information in the GTP-U extension header of PDCP SDU of the DRB that the QoS flow belongs to.
  • the source gNB will provide the first synchronization identification information in the GTP-U extension header of SDAP SDU.
  • Figure 9 illustrates an example of a procedure of supporting synchronization transmission in accordance with aspects of the present disclosure, wherein issue 3 is mainly considered.
  • the method is illustrated in a system level among CN, a CU of a RAN node, e.g., a gNB-CU and a DU of the RAN node, e.g., a gNB-DU
  • a gNB-CU a gNB-CU
  • a DU of the RAN node e.g., a gNB-DU
  • the method implemented in the CN, CU and DU can be separately implemented and/or incorporated by other apparatus with the like functions.
  • only communication between the CU and one DU is illustrated, identical or similar communication between the CU and other DU (s) is possible.
  • the CU will receive synchronization information related to synchronization transmissions among QoS flows, e.g., the first synchronization association information, the first synchronization threshold information and the first synchronization identification information from the CN as described above in view of figures 3-7.
  • the CU will receive the first synchronization association information and the first synchronization threshold information in step 901, and receive the synchronization identification information in step 903.
  • the implementations of the methods and apparatuses described in view of figure 9 focus on the communication between the CU and DU.
  • synchronization transmissions among QoS flows in the CU will be synchronization transmissions among DRBs to which the QoS flows are mapped.
  • a first synchronization transmission set which is a set of packets crossing multiple QoS flows which need synchronization transmission
  • a second synchronization transmission set which is a set of packets of DRBs needing synchronization transmission.
  • the second synchronization transmission set is a set of packets crossing multiple DRBs which need synchronization transmission, which means PDUs belonging to different DRBs need to be transmitted within a synchronization threshold.
  • the CU will decide synchronization information related to synchronization transmission among DRBs based on synchronization information related to synchronization transmissions among QoS flows and QoS flow to DRB mapping, and then transmit the synchronization information related to synchronization transmission among DRBs to the DU, so that the DU can perform synchronization-based scheduling and transmission.
  • the CU will determine synchronization association information of DRBs based on the first synchronization association information and QoS flow to DRB mapping.
  • the synchronization association information of DRBs is also referred to as second synchronization association information of DRBs or second synchronization association information.
  • the CU will transmit the second synchronization association information of DRBs to the DU in step 905b.
  • the CU will provide the second synchronization association information for the DU by F1-AP signaling during DRB setup or DRB modification related procedures, e.g., in a UE context setup request or a UE context modification request message. Accordingly, the DU will receive the second synchronization association information.
  • the second synchronization association information is provided in a DRB to be setup list IE as shown in figure 10, wherein for a DRB to be setup, synchronization association information associated with the DRB is also indicated. For example, when DRB#1 is to be setup, the associated DRB needed synchronization transmission with DRB#1, e.g., DRB#2 is also indicated.
  • the second synchronization association information is provided in another IE separate from the DRB to be setup list IE as shown in figure 11, which includes a synchronization transmission association ID and indicates all DRBs are associated with the synchronization association ID. For example, it is indicated that DRB #1 and DRB #2 are associated with synchronization transmission, which is identified by synchronization transmission association #1, while DRB #3 and DRB #4 are associated with another synchronization transmission, which is identified by synchronization transmission association #2.
  • the CU will determine synchronization threshold information for the second synchronization transmission set based on the first synchronization threshold information and QoS flow to DRB mapping.
  • the synchronization threshold information for the second synchronization transmission set is also referred to as second synchronization threshold information.
  • the CU will transmit the second synchronization threshold information to the DU in step 905b or a separate step.
  • the CU will provide the second synchronization threshold information for the DU by F1-AP signaling during DRB setup or DRB modification related procedures, e.g., in a UE context setup request message or a UE context modification request message. Accordingly, the DU will receive the second synchronization threshold information.
  • the second synchronization threshold information is defined in a manner similar to the first synchronization threshold information.
  • the second synchronization threshold information indicates one or multiple second synchronization thresholds, and each second synchronization threshold indicates time or latency that the synchronization transmission needs to be satisfied.
  • each second synchronization threshold indicates a delay requirement between PDUs of different DRBs, or a delay requirement between PDU sets of different DRBs, or a delay requirement between PDUs and PDU sets of different DRBs.
  • different second synchronization thresholds are defined based on a first transmitted or received PDU or PDU set of different DRBs.
  • the second synchronization threshold information may be the same as or different from the first synchronization threshold information.
  • the second synchronization threshold information is the same as the first synchronization threshold information.
  • the CU will determine synchronization identification information for the second synchronization transmission set based on the first synchronization identification information and QoS flow to DRB mapping.
  • the synchronization identification information for the second synchronization transmission set is also referred to as second synchronization identification information.
  • the CU will transmit the second synchronization identification information to the DU in step 907b, e.g., in a user plane header. Accordingly, the DU will receive the second synchronization identification information.
  • the second synchronization identification information may be the same as or different from the first synchronization identification information. For example, in the case that the multiple QoS flows associated with the first synchronization transmission set are mapped into the same DRB, the second synchronization identification information is the same as the first synchronization threshold information.
  • the second synchronization identification information is added in NR RAN container in the GTP-U extension header.
  • the NR RAN container in the GTP-U extension header is used to provide user plane protocol as specified in TS 38.425.
  • the second synchronization identification information is added after QoS flow to DRB mapping and PDCP layer processing, e.g. the second synchronization identification information being for each PDCP PDU or each PDU set.
  • the second synchronization identification information can be added in a novel container in the GTP-U extension header or in the PDU session container specified in TS 38.415.
  • the content and format of the novel container are similar to the above NR RAN container based solution.
  • the processor 1202, the memory 1204, the controller 1206, or the transceiver 1208, or various combinations or components thereof may be implemented in hardware (e.g., circuitry) .
  • the hardware may include a processor, a digital signal processor (DSP) , an application-specific integrated circuit (ASIC) , or other programmable logic device, or any combination thereof configured as or otherwise supporting a means for performing the functions described in the present disclosure.
  • DSP digital signal processor
  • ASIC application-specific integrated circuit
  • the processor 1202 may include an intelligent hardware device (e.g., a general-purpose processor, a DSP, a CPU, an ASIC, an FPGA, or any combination thereof) .
  • the processor 1202 may be configured to operate the memory 1204.
  • the memory 1204 may be integrated into the processor 1202.
  • the processor 1202 may be configured to execute computer-readable instructions stored in the memory 1204 to cause the NE 1200 to perform various functions of the present disclosure.
  • the memory 1204 may include volatile or non-volatile memory.
  • the memory 1204 may store computer-readable, computer-executable code including instructions when executed by the processor 1202 cause the NE 1200 to perform various functions described herein.
  • the code may be stored in a non-transitory computer-readable medium such the memory 1204 or another type of memory.
  • Computer-readable media includes both non-transitory computer storage media and communication media including any medium that facilitates transfer of a computer program from one place to another.
  • a non-transitory storage medium may be any available medium that may be accessed by a general-purpose or special-purpose computer.
  • the processor 1202 and the memory 1204 coupled with the processor 1202 may be configured to cause the NE 1200 to perform one or more of the functions described herein (e.g., executing, by the processor 1202, instructions stored in the memory 1204) .
  • the processor 1202 may support wireless communication at the NE 1200 in accordance with examples as disclosed herein.
  • the NE 1200 may be configured to support a means for synchronization transmission, e.g., a RAN node, wherein the processor 1202 is configured to cause the RAN node to: receive first synchronization association information of QoS flows and a first synchronization threshold information of a first synchronization transmission set from a CN via control plane signaling, wherein the first synchronization transmission set is a set of packets crossing multiple QoS flows that needs synchronization transmission; receive first synchronization identification information of the first synchronization transmission set from the CN via user plane protocol; and perform transmission of the first synchronization transmission set to a UE according to the first synchronization association information, the first synchronization threshold information and the first synchronization identification information.
  • a means for synchronization transmission e.g., a RAN node
  • the processor 1202 is configured to cause the RAN node to: receive first synchronization association information of QoS flows and a first synchronization threshold information of a first synchronization transmission set
  • the first synchronization association information of QoS flows indicates QoS flows that need synchronization transmission by indicating QFIs of the QoS flows; or indicating that the QoS flows belong to a same multi-modal service.
  • the first synchronization association information of QoS flows further indicates identification information of the different PDU sessions.
  • each first synchronization threshold indicates a delay requirement between PDUs of different QoS flows, or a delay requirement between PDU sets of different QoS flows, or a delay requirement between PDUs and PDU sets of different QoS flows.
  • the at least one processor is configured to cause the RAN node to: receive the first synchronization association information of QoS flows and the first synchronization threshold information in a PDU session resource setup request message or PDU session resource modify request message.
  • the at least one processor is configured to cause the RAN node to: receive the first synchronization identification information of the first synchronization transmission set in a GTP-U extension header of a QoS flow of the multiple QoS flows.
  • the first synchronization identification information indicates sequence number information of PDU sets of each corresponding QoS flow belonging to the first synchronization transmission set by respective PDU set sequence numbers and/or PDU set sequence number ranges; and/or in the case that the first synchronization transmission set includes PDUs from one or more of the multiple QoS flows, the first synchronization identification information indicates sequence number information of PDUs of each corresponding QoS flow belonging to the first synchronization transmission set by respective PDU sequence numbers and/or PDU sequence number ranges.
  • the first synchronization identification information indicates a synchronization number, and each PDU and/or PDU set of the first synchronization transmission set has a same synchronization number.
  • the arrival time information of the first PDU or first PDU set of the first synchronization transmission set indicates: absolute time of the first PDU or first PDU set of the first synchronization transmission set arriving at the RAN node from the CN; SFN timing that represents arrival time of the first PDU or first PDU set of the first synchronization transmission set at RAN side; and/or buffered time of the first PDU or first PDU set of the first synchronization transmission set.
  • the at least one processor is configured to cause the RAN node to: indicate which QoS flow's PDU or PDU set first arriving at the source RAN node to the target RAN node in the case that the first synchronization threshold information indicates one or more first synchronization thresholds.
  • the second synchronization threshold information indicates one or multiple second synchronization thresholds, and each second synchronization threshold indicates time or latency that the synchronization transmission needs to be satisfied.
  • the second synchronization threshold information indicates one or multiple second synchronization thresholds, and each second synchronization threshold indicates time or latency that the synchronization transmission needs to be satisfied.
  • each second synchronization threshold indicates a delay requirement between protocol data units (PDUs) of different DRBs, or a delay requirement between PDU sets of different DRBs, or a delay requirement between PDUs and PDU sets of different DRBs.
  • PDUs protocol data units
  • the remaining synchronization time information indicates arrival time information of a first PDU or first PDU set of the synchronization transmission set
  • the arrival time information indicates: absolute time of the first PDU or PDU set of the synchronization transmission set arriving at the source RAN node from a CN; SFN timing that represents arrival time of the first PDU or first PDU set of the synchronization transmission set at RAN side; and/or buffered time of the first PDU or first PDU set of the synchronization transmission set.
  • the at least one processor is configured to cause the RAN node to: receive information indicating which QoS flow's PDU or PDU set first arriving at the source RAN node in the case that the synchronization threshold information indicates one or more synchronization thresholds.
  • the synchronization identification information indicates sequence number information of PDU sets of each corresponding QoS flow belonging to the synchronization transmission set by respective PDU set sequence numbers and/or PDU set sequence number ranges; and/or in the case that the synchronization transmission set includes PDUs from one or more of the multiple QoS flows, the synchronization identification information indicates sequence number information of PDUs of each corresponding QoS flow belonging to the synchronization transmission set by respective PDU sequence numbers and/or PDU sequence number ranges.
  • a transmitter chain 1212 may be configured to generate and transmit signals (e.g., control information, data, packets) .
  • the transmitter chain 1212 may include at least one modulator for modulating data onto a carrier signal, preparing the signal for transmission over a wireless medium.
  • the at least one modulator may be configured to support one or more techniques such as amplitude modulation (AM) , frequency modulation (FM) , or digital modulation schemes like phase-shift keying (PSK) or quadrature amplitude modulation (QAM) .
  • the transmitter chain 1212 may also include at least one power amplifier configured to amplify the modulated signal to an appropriate power level suitable for transmission over the wireless medium.
  • the transmitter chain 1212 may also include one or more antennas for transmitting the amplified signal into the air or wireless medium.
  • the method may include receiving, from a source RAN node, synchronization association information of QoS flows, synchronization threshold information of a synchronization transmission set, and synchronization identification information of the synchronization transmission set, wherein the synchronization transmission set is a set of packets crossing multiple QoS flows that needs synchronization transmission.
  • the operations of step 1401 may be performed in accordance with examples as described herein. In some implementations, aspects of the operations of step 1401 may be performed by a NE as described with reference to figure 12.

Abstract

Divers aspects de la présente invention concernent un procédé et un appareil de support de transmissions de synchronisation. Un exemple de nœud RAN comprend : au moins une mémoire ; et au moins un processeur couplé à la ou aux mémoires et configuré pour amener le nœud RAN à : recevoir des premières informations d'association de synchronisation de flux de QoS et des premières informations de seuil de synchronisation d'un premier ensemble de transmissions de synchronisation à partir d'un CN par l'intermédiaire d'une signalisation de plan de commande, le premier ensemble de transmissions de synchronisation étant un ensemble de paquets croisant de multiples flux de QoS qui nécessitent une transmission de synchronisation ; recevoir des premières informations d'identification de synchronisation du premier ensemble de transmission de synchronisation à partir du CN par l'intermédiaire d'un protocole de plan d'utilisateur ; et effectuer une transmission du premier ensemble de transmission de synchronisation à un UE selon les premières informations d'association de synchronisation, les premières informations de seuil de synchronisation et les premières informations d'identification de synchronisation.
PCT/CN2023/109107 2023-07-25 2023-07-25 Procédé et appareil de prise en charge de transmissions de synchronisation WO2024113907A1 (fr)

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