WO2022082522A1 - Procédé et appareil de transmission de données subséquente - Google Patents

Procédé et appareil de transmission de données subséquente Download PDF

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Publication number
WO2022082522A1
WO2022082522A1 PCT/CN2020/122572 CN2020122572W WO2022082522A1 WO 2022082522 A1 WO2022082522 A1 WO 2022082522A1 CN 2020122572 W CN2020122572 W CN 2020122572W WO 2022082522 A1 WO2022082522 A1 WO 2022082522A1
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WO
WIPO (PCT)
Prior art keywords
data transmission
small data
step rach
idle mode
mode
Prior art date
Application number
PCT/CN2020/122572
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English (en)
Inventor
Jie Shi
Haiming Wang
Lianhai WU
Ran YUE
Jing HAN
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Lenovo (Beijing) Limited
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Publication date
Application filed by Lenovo (Beijing) Limited filed Critical Lenovo (Beijing) Limited
Priority to PCT/CN2020/122572 priority Critical patent/WO2022082522A1/fr
Publication of WO2022082522A1 publication Critical patent/WO2022082522A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • H04W74/0833—Random access procedures, e.g. with 4-step access

Definitions

  • Embodiments of the present application generally relate to wireless communication technology, especially to a method and apparatus for subsequent data transmission.
  • a user equipment (UE) in RRC_INACTIVE state also called an inactive mode UE
  • RRC_INACTIVE state it is possible to transmit uplink (UL) small data to a base station (BS) in an initial random access procedure, such as, 2-step random access channel (RACH) procedure or 4-step RACH procedure.
  • the UE may have subsequent UL small data to be transmitted, and the network (the BS) may have downlink (DL) data to be transmitted. Therefore, how to perform the subsequent UL/DL data transmission when the UE is in inactive mode needs to be considered.
  • Embodiments of the present application provide a method and apparatus for subsequent data transmission.
  • An embodiment of the present application provides a method performed by a user equipment (UE) in inactive mode or in idle mode.
  • the method may include: transmitting a first uplink (UL) data in Msg. A of 2-step random access channel (RACH) procedure; receiving resource for a dedicated preamble for a subsequent UL data; transmitting the subsequent UL data based on the dedicated preamble; and monitoring downlink (DL) response message.
  • UL uplink
  • RACH 2-step random access channel
  • the resource for the dedicated preamble is received in Msg. B of 2-step RACH procedure or in subsequent UL or DL scheduling information.
  • the subsequent UL or DL scheduling information could be downlink control information (DCI) for UL or DL scheduling, or radio resource control (RRC) message or media access control (MAC) control element (CE) including subsequent UL or DL scheduling information.
  • DCI downlink control information
  • RRC radio resource control
  • MAC media access control
  • CE media access control
  • the resource for the dedicated preamble could also be extended to include physical uplink share channel (PUSCH) resource associated to this dedicated preamble.
  • the resource for the dedicated preamble could be at least one of the time/frequency resource and sequence/code resource.
  • the resource for the dedicated preamble is received via at least one of radio resource control (RRC) message, a media access control (MAC) control element (CE) , or physical layer signalling.
  • RRC radio resource control
  • MAC media access control
  • CE control element
  • the method may further include: receiving indication information to indicate the resource for the dedicated preamble being applied for one shot, a plurality of shots, an entire small data transmission procedure for the UE in inactive mode or idle mode, or when a first timer is running, or during a period.
  • the DL response message is monitored in a window or when a second timer is running.
  • the method may further include: if a successful DL response message is not received in the window, or when the second timer is running, or until the second timer is expired, increasing a number of failure (s) of the 2-step RACH based small data transmission procedure by 1.
  • the method may further include: if the number of failure (s) of the 2-step RACH based small data transmission procedure is greater than a threshold, transmitting a subsequent UL data by 4-step RACH procedure, wherein the 4-step RACH procedure is for small data transmission for the UE in inactive mode or idle mode, or for non-small data transmission for the UE in inactive mode or idle mode, or not for small data transmission.
  • the threshold for transmitting a subsequent UL data transmission by 4-step RACH procedure for small data transmission for the UE in inactive mode or idle mode, or for non-small data transmission for the UE in inactive mode or idle mode, or not for small data transmission could be different. This means that the threshold is related to the specific 4-step RACH procedure.
  • the 4-step RACH procedure is for small data transmission for the UE in inactive mode or idle mode, or for non-small data transmission for the UE in inactive mode or idle mode, or not for small data transmission.
  • This threshold may be configured to the UE by RRC message, or SIB information, or MAC CE. If the number of failure (s) of the 2-step RACH procedure for small data transmission for the UE in inactive mode or idle mode is greater than another threshold, the UE could initiate the 2-step RACH procedure for non-small data transmission for UE in active mode or idle mode.
  • the UE could report its BSR for small data transmission for UE in inactive mode or idle mode in MsgA of this the 2-step RACH procedure for non-small data transmission for UE in active mode or idle mode.
  • This threshold is configured to the UE by RRC message, or SIB information, or MAC CE.
  • the UE will have a priority to initiate the 4-step RACH procedure for small data transmission for the UE in inactive mode or idle mode.
  • the number of the UE not successful in 2-step RACH procedure is greater than a threshold, for example, which means that the PREAMBLE_TRANSMISSION_COUNTER for 2-step RACH procedure for small data transmission for the UE in inactive mode or idle mode is greater than a threshold, or equals to a threshold+1.
  • the method may further include: receiving a DL data which is multiplexed in the DL response message.
  • the method may further include: monitoring and receiving a DL data based on discontinuous reception (DRX) or DL semi-persistent scheduling (SPS) .
  • DRX discontinuous reception
  • SPS DL semi-persistent scheduling
  • the method may further include: receiving at least one configuration of the DRX or the DL SPS in a radio resource control (RRC) release message or in a RRC message when the UE transitions from a connected mode to the inactive mode, when the UE transitions from the connected mode to the idle mode, or when the UE is in the inactive mode or the idle mode, wherein the RRC release message or the RRC message enables the UE in the inactive mode or in the idle mode to transmit or receive data, or transmit or receive data in configured grant (CG) resources.
  • RRC radio resource control
  • the method may further include: transmitting indication information to indicate one configuration of the DRX or the DL SPS for small data transmission for the UE in inactive mode or idle mode; and/or receiving indication information to indicate one configuration of the DRX or one or more dedicated configuration of the DL SPS.
  • the method may further include: receiving configuration of the DRX or the DL SPS in the 2-step RACH procedure.
  • the configuration of the DRX or the DL SPS is per data radio bearer (DRB) or per traffic pattern.
  • DRB data radio bearer
  • the method may further include: storing or releasing the configuration of the DRX or the DL SPS based on network indication or specified UE behavior when small data transmission procedure for the UE in inactive mode or idle mode is ended.
  • the method may include: transmitting a first uplink (UL) data in Msg. 3 of 4-step random access channel (RACH) procedure; receiving UL scheduling information for a subsequent UL transmission in Msg. 4 of 4-step random access channel (RACH) procedure, and/or receiving downlink (DL) assignment information for a subsequent DL transmission in Msg. 4 of 4-step RACH procedure; transmitting the subsequent UL transmission based on the UL scheduling information; and monitoring DL response message, and/or receiving the subsequent DL transmission based on the DL assignment information, where the UL scheduling information is one of UL grant and a dedicated preamble in Msg. A of 2-step RACH procedure.
  • RACH random access channel
  • the subsequent UL transmission is transmitted based on the UL grant.
  • the subsequent UL transmission is transmitted based on the dedicated preamble in Msg. A of 2-step RACH procedure.
  • the DL response message is monitored in a window or when a second timer is running.
  • the method may further include: monitoring and receiving a DL data based on discontinuous reception (DRX) or DL semi-persistent scheduling (SPS) .
  • DRX discontinuous reception
  • SPS DL semi-persistent scheduling
  • the method may further include: receiving and storing at least one configuration of the DRX or the DL SPS in a radio resource control (RRC) release message or in a RRC message when the UE transitions from a connected mode to the inactive mode, when the UE transitions from the connected mode to the idle mode, or when the UE is in the inactive mode or the idle mode, where the RRC release message or the RRC message enables the UE in the inactive mode or in the idle mode to transmit or receive data, or transmit or receive data in configured grant (CG) resources.
  • RRC radio resource control
  • the method may further include: transmitting indication information to indicate one configuration of the DRX or the DL SPS for small data transmission for the UE the inactive mode or the idle mode; and/or receiving indication information to indicate one configuration of the DRX or one or more dedicated configuration of the DL SPS.
  • the method may further include: receiving configuration of the DRX or the DL SPS in the 4-step RACH procedure.
  • the configuration of the DRX or the DL SPS may be received in the Msg. 2 or Msg. 4 in 4-step RACH procedure.
  • the configuration of the DRX or the DL SPS is per data radio bearer (DRB) or per traffic pattern.
  • DRB data radio bearer
  • the method may further include: storing or releasing the configuration of the DRX or the DL SPS based on network indication or UE behavior when small data transmission procedure for the UE in inactive mode or idle mode is ended.
  • the DL assignment is applied for one shot, a plurality of shots, an entire data transmission procedure, or when a third timer is running.
  • the method may further include: receiving indication information to indicate the DRX or DL SPS being applied for one shot, a plurality of shots, an entire small data transmission procedure for the UE in inactive mode or idle mode, or when a timer is running, or until the small data transmission procedure is ended.
  • the number of shot in a plurality of shots could be configured by network to UE.
  • Another embodiment of the present application provides a method performed by a user equipment (UE) in inactive mode or in idle mode.
  • the method may include: monitoring and receiving a DL data based on discontinuous reception (DRX) or DL semi-persistent scheduling (SPS) .
  • DRX discontinuous reception
  • SPS DL semi-persistent scheduling
  • the method may further include: receiving at least one configuration of the DRX or the DL SPS in a radio resource control (RRC) release message or in a RRC message when the UE transitions from a connected mode to the inactive mode, when the UE transitions from the connected mode to the idle mode, or when the UE is in the inactive mode or the idle mode, wherein the RRC release message or the RRC message enables the UE in the inactive mode or in the idle mode to transmit or receive data, or transmit or receive data in configured grant (CG) resources.
  • RRC radio resource control
  • the method may further include: transmitting indication information to indicate one configuration of the DRX or the DL SPS for small data transmission for the UE in inactive mode or idle mode; and/or receiving indication information to indicate one configuration of the DRX or one or more dedicated configuration of the DL SPS.
  • the method may further include: receiving configuration of the DRX or the DL SPS in CG based small data transmission procedure for UE in inactive mode or idle mode.
  • the configuration of the DRX or the DL SPS is per data radio bearer (DRB) or per traffic pattern.
  • DRB data radio bearer
  • the method may further include: storing or releasing the configuration of the DRX or the DL SPS based on network indication or UE behavior when small data transmission procedure for the UE in inactive mode or idle mode is ended.
  • the configuration of the DRX or the DL SPS is per data radio bearer (DRB) or per traffic pattern. It could be applied to UE in duration or until the end of small data transmission in UE inactive mode or idle mode.
  • DRB data radio bearer
  • Another embodiment of the present application provides a method performed by a user equipment (UE) in inactive mode or in idle mode.
  • the method may include: transmitting a measurement result of a serving cell of the UE; and/or transmitting indication information to indicate that the UE be able or disable to apply 2-step RACH procedure for small data transmission for the UE in inactive mode or idle mode, and/or to indicate that the UE be able or disable to apply CG resource for small data transmission for the UE in inactive mode or idle mode.
  • Be able or disable to the small data transmission procedure means that UE is available or not available to the small data transmission procedure.
  • the method may further include: receiving indication information to indicate the UE to report that the UE is able or disable to apply 2-step RACH procedure for small data transmission for the UE in inactive mode or idle mode, or indicate the UE to report its measurement result to serving cell, or receiving indication information to indicate the UE to report that the UE is able or disable to apply CG resource for small data transmission for the UE in inactive mode or idle mode., or receiving indication information to indicate the UE is able or disable to apply 2-step RACH procedure for small data transmission for the UE in inactive mode or idle mode, or indicate the UE is able or disable to report its measurement result to serving cell, or indicate the UE is able or disable to apply CG resource for small data transmission for the UE in inactive mode or idle mode.
  • the indication information is transmitted in small data transmission procedure in UE inactive mode or idle mode.
  • the indication information is transmitted in RRC message, system information block, or MAC CE.
  • radio network temporary identity for the UE in 4-step RACH procedure is used in 2-step RACH procedure.
  • the method may include: initiating 4-step random access channel (RACH) procedure for small data transmission for the UE in inactive mode or idle mode, or initiating 2-step RACH procedure for non-small data transmission for the UE in inactive mode or idle mode, if PREAMBLE_TRANSMISSION_COUNTER for 2-step RACH procedure for small data transmission for the UE in inactive mode or idle mode is greater than a threshold, or equals to a threshold+1.
  • RACH 4-step random access channel
  • the method may further include: receiving an indication from network to initiate the 4-step RACH procedure for small data transmission for the UE in inactive mode or idle mode, or to initiate the 2-step RACH procedure for non-small data transmission for the UE in inactive mode or idle mode, when PREAMBLE_TRANSMISSION_COUNTER for 2-step RACH procedure for small data transmission for the UE in inactive mode or idle mode is greater than the threshold, or equals to the threshold+1; or directly initiating the 4-step RACH procedure for small data transmission for the UE in inactive mode or idle mode, or initiating the 2-step RACH procedure for non-small data transmission for the UE in inactive mode or idle mode, when PREAMBLE_TRANSMISSION_COUNTER for 2-step RACH procedure for small data transmission for the UE in inactive mode or idle mode is greater than the threshold, or equals to the threshold+1.
  • the threshold is received by at least one of RRC message, system information blocks, or MAC CE.
  • the method may further include: receiving UL grant for Msg. 3 transmission with UL data from network if the UE initiates 4-step RACH procedure for small data transmission for the UE in inactive mode or idle mode.
  • the method may further include: initiating 2-step RACH procedure for non-small data transmission for the UE in inactive mode or idle mode, if the UE is in 4-step RACH procedure for small data transmission for the UE in inactive mode or idle mode.
  • the method may further include: initiating 2-step RACH procedure for non-small data transmission for the UE in inactive mode or idle mode based on specified UE behavior or network indication, if the UE initiates 4-step RACH procedure for small data transmission for the UE in inactive mode or idle mode, if the PREAMBLE_TRANSMISSION_COUNTER for 4-step RACH procedure for small data transmission for the UE in inactive mode or idle mode is greater than a threshold, or equals to a threshold+1.
  • the UE will select the small data transmission procedure based on the priority that 2-step RACH procedure for small data transmission for the UE in inactive mode or idle mode is prior to that 4-step RACH procedure for small data transmission for the UE in inactive mode or idle mode.
  • the UE will select the data transmission procedure based on the priority that 4-step RACH procedure for small data transmission for the UE in inactive mode or idle mode is prior to that 2-step RACH procedure for non-small data transmission for the UE in inactive mode or idle mode.
  • the reason is that, for some UEs, the service may be urgent and data size is greater than a threshold, so the UE needs to transmit the UL data based on 4-step RACH procedure for SDT transmission for the UE in inactive mode or idle mode.
  • the 4-step RACH procedure for SDT transmission for the UE in inactive mode or idle mode could contain large data size than 2-step RACH procedure for non-small data transmission for the UE in inactive mode or idle mode.
  • the UE will select the small data transmission procedure based on the priority that 2-step RACH procedure for small data transmission for the UE in inactive mode or idle mode is prior to that 2-step RACH procedure for non-small data transmission for the UE in inactive mode or idle mode.
  • the UE will select the data transmission procedure based on the priority that 2-step RACH procedure for non-small data transmission for the UE in inactive mode or idle mode is prior to 4-step RACH procedure for small data transmission for the UE in inactive mode or idle mode.
  • the service may be urgent or data size is not larger than a threshold, so UE needs to transmit the UL data based on 2-step RACH procedure for non-small data transmission for the UE in inactive mode or idle mode.
  • the 4-step RACH procedure for SDT transmission for the UE in inactive mode or idle mode could contain large data size than 2-step RACH procedure for non-small data transmission for the UE in inactive mode or idle mode, but 2-step RACH procedure could transmit the data at the first message, the delay is short.
  • the method may include: receiving a first uplink (UL) data in Msg. A of 2-step random access channel (RACH) procedure; transmitting resource for a dedicated preamble for a subsequent UL data; receiving the subsequent UL data based on the dedicated preamble; and transmitting downlink (DL) response message.
  • UL uplink
  • RACH random access channel
  • the resource for the dedicated preamble is transmitted in Msg. B of 2-step RACH procedure or in subsequent UL or DL scheduling information.
  • the resource for the dedicated preamble is transmitted via at least one of radio resource control (RRC) message, a media access control (MAC) control element (CE) , or physical layer signalling.
  • RRC radio resource control
  • MAC media access control
  • CE control element
  • the method may further include: transmitting indication information to indicate the resource for the dedicated preamble being applied for one shot, a plurality of shots, an entire small data transmission procedure for the UE in inactive mode or idle mode, when a first timer is running, or during a period.
  • the DL response message is transmitted in a window or when a second timer is running.
  • the method may further include: if a successful DL response message is not transmitted in the window, or when the second timer is running, or until the second timer is expired, increasing a number of failure (s) of the 2-step RACH based small data transmission procedure by 1.
  • the method may further include: if the number of failures of the 2-step RACH procedure based small data transmission is greater than a threshold, receiving a subsequent UL data transmission by 4-step RACH procedure, wherein the 4-step RACH procedure is for small data transmission for the UE in inactive mode or idle mode, or for non-small data transmission for the UE in inactive mode or idle mode, or not for small data transmission.
  • the method may further include: transmitting a DL data which is multiplexed in the DL response message.
  • the method may further include: transmitting a DL data based on discontinuous reception (DRX) or DL semi-persistent scheduling (SPS) .
  • DRX discontinuous reception
  • SPS DL semi-persistent scheduling
  • the method may further include: transmitting at least one configuration of the DRX or the DL SPS in a radio resource control (RRC) release message or in a RRC message when the UE transitions from a connected mode to the inactive mode, when the UE transitions from the connected mode to the idle mode, or when the UE is in the inactive mode or the idle mode, where the RRC release message or the RRC message enables the UE in the inactive mode or in the idle mode to transmit or receive data, or transmit or receive data in configured grant (CG) resources.
  • RRC radio resource control
  • the method may further include: receiving indication information to indicate one configuration of the DRX or the DL SPS for small data transmission for the UE in inactive mode or idle mode; and/or transmitting indication information to indicate one configuration of the DRX or one or more dedicated configuration of the DL SPS based on the received indication information.
  • the method may further include: transmitting configuration of the DRX or the DL SPS in the 2-step RACH procedure.
  • the configuration of the DRX or the DL SPS is per data radio bearer (DRB) or per traffic pattern.
  • DRB data radio bearer
  • the method may further include: transmitting indication information for a user equipment (UE) to store or release the configuration of the DRX or the DL SPS when small data transmission procedure for the UE in inactive mode or idle mode is ended.
  • UE user equipment
  • the method may include: receiving a first uplink (UL) data in Msg. 3 of 4-step random access channel (RACH) procedure; transmitting UL scheduling information for a subsequent UL transmission in Msg. 4 of 4-step random access channel (RACH) procedure, and/or transmitting downlink (DL) assignment information for a subsequent DL transmission in Msg. 4 of 4-step RACH procedure; receiving the subsequent UL transmission based on the UL scheduling information; and transmitting downlink (DL) response message, and/or transmitting the subsequent DL transmission based on the DL assignment information, where the UL scheduling information is one of UL grant and a dedicated preamble in Msg. A of 2-step RACH procedure.
  • RACH random access channel
  • the subsequent UL transmission is received based on the UL grant.
  • the UL scheduling information is a dedicated preamble in Msg. A of 2-step RACH procedure
  • the subsequent UL transmission is received based on the dedicated preamble in Msg. Aof 2-step RACH procedure.
  • the method may further include: transmitting indication information to indicate the UL grant or the dedicated preamble being applied for one shot, a plurality of shots, an entire small data transmission procedure for the UE in inactive mode or idle mode, or when a first timer is running.
  • the DL response message is transmitted in a window or when a second timer is running.
  • the method may further include: transmitting a DL data based on discontinuous reception (DRX) or DL semi-persistent scheduling (SPS) .
  • DRX discontinuous reception
  • SPS DL semi-persistent scheduling
  • the method may further include: transmitting at least one configuration of the DRX or the DL SPS in a radio resource control (RRC) release message or in a RRC message when the UE transitions from a connected mode to the inactive mode, when the UE transitions from the connected mode to the idle mode, or when the UE is in the inactive mode or the idle mode, where the RRC release message or the RRC message enables the UE in the inactive mode or in the idle mode to transmit or receive data, or transmit or receive data in configured grant (CG) resources.
  • RRC radio resource control
  • the method may further include: receiving indication information to indicate one configuration of the DRX or the DL SPS for small data transmission for the UE the inactive mode or the idle mode; and/or transmitting indication information to indicate one configuration of the DRX or one or more dedicated configuration of the DL SPS.
  • the method may further include: transmitting configuration of the DRX or the DL SPS in the 4-step RACH procedure.
  • the configuration of the DRX or the DL SPS is per data radio bearer (DRB) or per traffic pattern.
  • DRB data radio bearer
  • the method may further include: transmitting indication information for a user equipment (UE) to store or release the configuration of the DRX or the DL SPS when small data transmission procedure for the UE in inactive mode or idle mode is ended.
  • UE user equipment
  • the DL assignment is applied for one shot, a plurality of shots, an entire data transmission procedure, or when a third timer is running.
  • the method may include: receiving a measurement result of a serving cell of the UE; and/or receiving indication information to indicate that the UE be able or disable to apply 2-step RACH procedure for small data transmission for the UE in inactive mode or idle mode, and/or to indicate that the UE be able or disable to apply CG resource for small data transmission for the UE in inactive mode or idle mode.
  • the method may further include: transmitting indication information to indicate the UE to report that the UE is able or disable to apply 2-step RACH procedure for small data transmission for the UE in inactive mode or idle mode, or indicate the UE to report its measurement result to serving cell, or receiving indication information to indicate the UE to report that the UE is able or disable to apply CG resource for small data transmission for the UE in inactive mode or idle mode, or transmitting indication information to indicate the UE is able or disable to apply 2-step RACH procedure for small data transmission for the UE in inactive mode or idle mode, or indicate the UE is able for disable report its measurement result to serving cell, or indicate the UE is able or disable to apply CG resource for small data transmission for the UE in inactive mode or idle mode.
  • Be able or disable to the small data transmission procedure means that UE is available or not available to the small data transmission procedure.
  • radio network temporary identity for the UE in 4-step RACH procedure is used in 2-step RACH procedure.
  • the method may include: receiving a UL data by 4-step random access channel (RACH) procedure for small data transmission for the UE in inactive mode or idle mode, or by 2-step RACH procedure for non-small data transmission for the UE in inactive mode or idle mode, if PREAMBLE_TRANSMISSION_COUNTER for 2-step RACH procedure for small data transmission for the UE in inactive mode or idle mode is greater than a threshold, or equals to a threshold+1.
  • RACH random access channel
  • the method may further include: transmitting an indication to initiate the 4-step RACH procedure for small data transmission for the UE in inactive mode or idle mode, or to initiate the 2-step RACH procedure for non-small data transmission for the UE in inactive mode or idle mode, when PREAMBLE_TRANSMISSION_COUNTER for 2-step RACH procedure for small data transmission for the UE in inactive mode or idle mode is greater than the threshold, or equals to the threshold+1.
  • the threshold is received by at least one of RRC message, system information blocks, or MAC CE.
  • the method may further include: transmitting UL grant for Msg. 3 transmission with UL data from network if the UE initiates 4-step RACH procedure for small data transmission for the UE in inactive mode or idle mode.
  • the method may further include: receiving a UL data by 2-step RACH procedure for non-small data transmission for the UE in inactive mode or idle mode, if the UE is in 4-step RACH procedure for small data transmission for the UE in inactive mode or idle mode.
  • the method may further include: receiving a UL data by 2-step RACH procedure for non-small data transmission for the UE in inactive mode or idle mode based on specified UE behavior or network indication, if the UE initiates 4-step RACH procedure for small data transmission for the UE in inactive mode or idle mode, if the PREAMBLE_TRANSMISSION_COUNTER for 4-step RACH procedure for small data transmission for the UE in inactive mode or idle mode is greater than a threshold, or equals to a threshold+1.
  • the apparatus may include at least one non-transitory computer-readable medium having computer executable instructions stored therein; at least one receiver; at least one transmitter; and at least one processor coupled to the at least one non-transitory computer-readable medium, the at least one receiver and the at least one transmitter.
  • the computer executable instructions are programmed to implement the above method with the at least one receiver, the at least one transmitter and the at least one processor.
  • the embodiments of the present application may perform the subsequent UL/DL data transmission with less scheduling information.
  • FIG. 1 illustrates a wireless communication system according to some embodiments of the present application
  • FIG. 2 illustrates another wireless communication system according to some embodiments of the present application
  • FIG. 3 illustrates a flow chart of a method for subsequent data transmission according to some embodiments of the present application
  • FIG. 4 illustrates a flow chart of another method for subsequent data transmission according to an embodiment of the present application
  • FIG. 5 illustrates a flow chart of another method for subsequent data transmission according to an embodiment of the present application
  • FIG. 6 illustrates an apparatus according to some embodiments of the present application.
  • FIG. 7 illustrates another apparatus according to some other embodiments of the present application.
  • FIG. 1 illustrates a wireless communication system according to some embodiments of the present application.
  • the wireless communication system can include at least one base station (BS) , at least one UE, and a core network (CN) node.
  • BS base station
  • UE UE
  • a core network (CN) node e.g., a BS (e.g., BS 102) and a UE (UE 101) are depicted in FIG. 1, one skilled in the art will recognize that any number of the BSs and UEs may be included in the wireless communication system.
  • the BS 102 may be distributed over a geographic region and may communicate with the CN node 103 via an interface.
  • FIG. 2 illustrates another wireless communication system according to some embodiments of the present application.
  • the wireless communication system can include at least one BS, at least one UE, and a CN node.
  • BSs and UEs e.g., two BSs (e.g., BS 202a and BS 202b) and a UE (UE 201) are depicted in FIG. 2, one skilled in the art will recognize that any number of the BSs and UEs may be included in the wireless communication system.
  • the BS 202a and the BS 202b may be distributed over a geographic region, and they may communicate with each other via an interface, for example, interface Xn.
  • the BS 202a and the BS 202b may communicate with a CN node 203 via an interface, for example, interface NG.
  • the UE 201 is in a RRC_INACTIVE state (or inactive mode) .
  • RRC_INACTIVE state is a state where a UE remains in connection management (CM) -CONNECTED and can move within an area configured by next generation-radio access network (NG-RAN) (that is, RAN notification area (RNA) ) without notifying NG-RAN.
  • NG-RAN next generation-radio access network
  • RNA RAN notification area
  • the UE 201 can move within the RNA 222.
  • the BS 202b can be the last serving BS of UE 201, and the UE 201 is currently in the cell covered by the BS 202a.
  • the BS 202b keeps the context of the UE 201 and the associated NG connection with the CN node 203 (such as, the serving AMF and UPF) .
  • the UE 201 in inactive mode may transmit uplink data.
  • the UE 201 may perform small data transmission.
  • the BS 202a may transmit the data from the UE 201 to the BS 202b via the interface Xn, and then the BS 202b transmits the data to the CN node 203.
  • the BS 202a when performing the small data transmission, the BS 202a knows that there is data from the UE 201 to be transmitted, the BS 202a first obtains the context of the UE 201 from the BS 202b and then transmits the data from the UE 201 to the CN node 203.
  • the UE may be a computing device, such as a desktop computer, a laptop computer, a personal digital assistant (PDA) , a tablet computer, a smart television (e.g., a television connected to the Internet) , a set-top box, a game console, a security system (including security cameras) , a vehicle on-board computer, a network device (e.g., router, switch, and modem) , or the like.
  • a computing device such as a desktop computer, a laptop computer, a personal digital assistant (PDA) , a tablet computer, a smart television (e.g., a television connected to the Internet) , a set-top box, a game console, a security system (including security cameras) , a vehicle on-board computer, a network device (e.g., router, switch, and modem) , or the like.
  • PDA personal digital assistant
  • a smart television e.g., a television connected to the Internet
  • the UE may be a portable wireless communication device, a smart phone, a cellular telephone, a flip phone, a device having a subscriber identity module, a personal computer, a selective call receiver, or any other device that is capable of sending and receiving communication signals on a wireless network.
  • the UE may be a wearable device, such as a smart watch, a fitness band, an optical head-mounted display, or the like.
  • the UE may be referred to as a subscriber unit, a mobile, a mobile station, a user, a terminal, a mobile terminal, a wireless terminal, a fixed terminal, a subscriber station, a user terminal, or a device, or described using other terminology used in the art.
  • the BS (such as BS 102 in FIG. 1 and the BS 202a and the BS 202b in FIG. 2) may also be referred to as an access point, an access terminal, a base, a base unit, a macro cell, a Node-B, an evolved Node B (eNB) , a gNB, a Home Node-B, a relay node, or a device, or described using other terminology used in the art.
  • the BS may be generally part of a radio access network that may include one or more controllers communicably coupled to one or more corresponding BS (s) .
  • the CN node (such as, the CN node 103 in FIG. 1 and the CN node 203 in FIG. 2) can be a mobility management entity (MME) or a serving gateway (S-GW) .
  • the CN node may include a mobility management function (AMF) or a user plane function (UPF) .
  • AMF mobility management function
  • UPF user plane function
  • the UL or DL transmission following UL small data transmissions (SDT) without transitioning to RRC_CONNECTED state is supported.
  • SDT small data transmissions
  • the UE When there is an RRC connection between the UE and the BS, the UE is in the RRC_CONNECTED state.
  • RRC_INACTIVE state it may be possible to send multiple UL and DL packets as part of the same SDT mechanism and without transitioning to RRC_CONNECTED on dedicated grant.
  • a UE in inactive mode it is possible to transmit UL small data to a BS in an initial random access procedure, such as, 2-step RACH procedure or 4-step RACH procedure. Furthermore, the UE may have subsequent UL small data to be transmitted, and the BS may have DL data to be transmitted. Therefore, it is desirable to provide a solution for the UE to perform the subsequent UL/DL data transmission when the UE is in inactive mode.
  • FIG. 3 illustrates a flow chart of a method for subsequent data transmission according to some embodiments of the present application.
  • the method in FIG. 3 may be performed between a UE (such as, the UE 101 in FIG. 1 or the UE 201 in FIG. 2) which is in active mode or in idle mode and a BS (such as, the BS 102 in FIG. 1 or the BS 201a or the BS 201b in FIG. 2) .
  • the enhanced Msg. A and Msg. B in 2-step RACH procedure for subsequent DL/UL data transmission can be reused.
  • a UE transmits a UL data (or called a first UL data, or an initial UL data) in Msg.
  • a UL data or called a first UL data, or an initial UL data
  • a of 2-step RACH procedure a UL data (or called a first UL data, or an initial UL data) in Msg.
  • the BS After receiving the UL data from the UE, in order to schedule a subsequent UL data (or called a second UL data) transmission, in operation 302, the BS transmits resource for a dedicated preamble (or called dedicated preamble resource) for the subsequent UL data transmission.
  • the subsequent UL data transmission may be UL small data or non-UL small data (such as, UL buffer status report (BSR) /release assistance information (RAI) ) . If there is DL data to be transmitted, the BS may also transmit the DL data along with the resource for a dedicated preamble.
  • the resource for the dedicated preamble for the subsequent UL data transmission may be time, frequency, or sequence resource.
  • the resource for the dedicated preamble is transmitted in Msg. B of 2-step RACH procedure.
  • the resource for the dedicated preamble is transmitted in subsequent UL or DL scheduling information.
  • the subsequent UL or DL scheduling information may have the same or similar structure of Msg. B of 2-step RACH procedure.
  • the subsequent UL or DL scheduling information could be downlink control information (DCI) for UL or DL scheduling, or RRC message or MAC CE including subsequent UL or DL scheduling information.
  • DCI downlink control information
  • the resource for the dedicated preamble could also be extended to include physical uplink share channel (PUSCH) resource associated to this dedicated preamble.
  • the resource for the dedicated preamble could be at least one of the time/frequency resource and sequence/code resource.
  • the resource for the dedicated preamble may be transmitted via radio resource control (RRC) message, a media access control (MAC) control element (CE) , or physical layer signalling.
  • RRC radio resource control
  • MAC media access control
  • CE control element
  • the BS may also transmit indication information to indicate the resource for the dedicated preamble being applied for one shot, a plurality of shots, or an entire small data transmission procedure for the UE in inactive mode or idle mode.
  • a new timer can be configured so that the resource for the dedicated preamble can be applied when the timer is running or during a period.
  • the UE transmits the subsequent UL data transmission based on the dedicated preamble.
  • the BS transmits DL response message.
  • the UE monitors the DL response message.
  • the feedback from the network is short and does not need to include feedback (s) to multiple UEs.
  • the UE may monitor the DL response message in a short-size window or when a new timer is running (before a new timer expired) .
  • the BS may transmit the DL response message in the short-size window or when the new timer is running. If there is DL data to be transmitted, the DL data can be multiplexed in the DL response message and transmitted to the UE.
  • the DL response message may further include dedicated preamble resource for next UL data if needed.
  • the UE will determine this UL data transmission as failed. And the UE will increase a number of failures of the 2-step RACH procedure based small data transmission by 1. And then the UE will initialize another 2-step RACH procedure for small data transmission if it is available.
  • the number of failures of 2-step RACH procedure is the number of a preamble transmission counter for small data transmission where the response for the UL data transmission is not received.
  • the small data transmission includes the initial UL data in Msg. A and/or the subsequent UL data in the subsequent UL transmission for the UE in inactive mode or idle mode.
  • the successful DL response message means the acknowledged information from the network (the BS) received by the UE.
  • a successful DL response message could be defined by at least one of the following cases:
  • C-RNTI cell-radio network temporary identifier
  • the Msg. A could be replaced by other UL information request with subsequent UL data transmission.
  • the C-RNTI or TEMPORARY_C-RNTI could be replaced by the other X-RNTI for the subsequent UL or DL data transmission in UE inactive mode.
  • X-RNTI could be C-RNTI defined in 2-step RACH procedure. Then a successful DL response message could be confirmed. Or a successful DL response message could be defined as: UE receives the DL response message scrambled by C-RNTI or X-RNTI successfully and the received TB is successfully decoded.
  • the UE may transmit the subsequent UL data transmission by 4-step RACH procedure.
  • the UE may transmit the subsequent UL data transmission based on the preamble of 4-step RACH procedure or the UL grant of 4-step RACH procedure which can be obtained from the DL response message.
  • the 4-step RACH procedure may be for small data transmission for the UE in inactive mode or idle mode, or for non-small data transmission (such as, BSR and RAI transmission) for the UE in inactive mode or idle mode, or not for small data transmission.
  • the threshold for transmitting a subsequent UL data transmission by 4-step RACH procedure for small data transmission for the UE in inactive mode or idle mode, or for non-small data transmission for the UE in inactive mode or idle mode, or not for small data transmission could be different.
  • the threshold is related to the specific 4-step RACH procedure.
  • the 4-step RACH procedure is for small data transmission for the UE in inactive mode or idle mode, or for non-small data transmission for the UE in inactive mode or idle mode, or not for small data transmission.
  • This threshold may be configured to UE by RRC message, or SIB information, or MAC CE.
  • the UE could initiate the 2-step RACH procedure for non-small data transmission for UE in active mode or idle mode. Then, the UE could report its BSR for small data transmission for UE in inactive mode or idle mode in MsgA of this the 2-step RACH procedure for non small data transmission for UE in active mode or idle mode.
  • This threshold is configured to the UE by RRC message, or SIB information, or MAC CE.
  • the UE will have a priority to initiate the 4-step RACH procedure for small data transmission for the UE in inactive mode or idle mode.
  • the number of the UE not successful in 2-step RACH procedure is greater than a threshold, for example, which means that the PREAMBLE_TRANSMISSION_COUNTER for 2-step RACH procedure for small data transmission for the UE in inactive mode or idle mode is greater than a threshold, or equals to a threshold+1.
  • the DL response message (such as, Msg. B) .
  • a physical downlink control channel (PDCCH) configuration including control resource set (CORSET) and search space may be configured to the UE to receive the DL scheduling information, and the UE may receive the DL data based on the DL scheduling information.
  • PDCCH physical downlink control channel
  • CORSET control resource set
  • search space may be configured to the UE to receive the DL scheduling information, and the UE may receive the DL data based on the DL scheduling information.
  • the DL data transmission in SDT may be sparse, so the signaling overhead for the monitoring on DL scheduling information in SDT should be further reduced.
  • the UE may monitor the subsequent DL message (similarly to Msg. B) over the dedicated PDCCH resource, and the dedicated PDCCH resource is limited in the PDCCH based on a discontinuous reception (DRX) for SDT in inactive mode or idle mode.
  • the UE may receive the DL data based on the DL semi-persistent scheduling (SPS) configuration for SDT in inactive mode or idle mode.
  • SPS semi-persistent scheduling
  • the BS may transmit a DL data based on DRX or DL SPS; and correspondingly, the UE may monitor and receive the DL data based on DRX or DL SPS.
  • the BS may transmit to the UE one or more configuration of the DRX or the DL SPS for SDT in inactive mode or idle mode before 2-step RACH procedure.
  • the UE may receive and store the one or more configuration of the DRX or the DL SPS for SDT in inactive mode or idle mode before 2-step RACH procedure.
  • the configuration of the DRX or the DL SPS can be per data radio bearer (DRB) or per traffic pattern.
  • DRX for SDT or DL SPS for SDT in inactive mode or idle mode may be configured and received in a radio resource control (RRC) release message or in a RRC message when the UE transitions from a connected mode to the inactive mode, when the UE transitions from the connected mode to the idle mode, or when the UE is in the inactive mode or the idle mode.
  • RRC release message or the RRC message enables the UE in the inactive mode or in the idle mode to transmit or receive data, or transmit or receive data in configured grant (CG) resources.
  • CG configured grant
  • the UE may transmit indication information to indicate one configuration of the DRX or the DL SPS for small data transmission for the UE the inactive mode or the idle mode to the BS.
  • the indicated configuration may be its preferable DRX or DL SPS.
  • the BS may transmit one configuration of DRX or one or multiple dedicated configurations of DL SPS based on the indication information transmitted by the UE.
  • the BS may transmit one configuration of DRX or one or multiple dedicated configurations of DL SPS directly without the indication information from the UE.
  • the BS may transmit one or more configuration of the DRX or the DL SPS for SDT in inactive mode or idle mode in the 2-step RACH procedure to the UE.
  • the UE may trigger the DRX or the DL SPS for SDT.
  • the UE will start to monitor the PDCCH on duration time based on the configuration of the DRX, and perform the UL or DL data transmission based on DRX mechanism.
  • the PDCCH resource including CORSET information and search space information could be configured in Msg. B of the 2-step RACH procedure.
  • the UE may store or release the configuration of the DRX or the DL SPS based on network indication or UE behavior.
  • FIG. 4 illustrates a flow chart of another method for subsequent data transmission according to some embodiments of the present application.
  • the method in FIG. 4 may be performed between a UE (such as, the UE 101 in FIG. 1 or the UE 201 in FIG. 2) which is in active mode or in idle mode and a BS (such as, the BS 102 in FIG. 1 or the BS 201a or the BS 201b in FIG. 2) .
  • the enhanced Msg. 3 and Msg. 4 in 4-step RACH procedure for subsequent DL/UL data transmission can be reused.
  • a UE transmits a UL data (or called a first UL data, or an initial UL data) in Msg. 3 of 4-step RACH procedure.
  • the BS After receiving the UL data from the UE, in order to schedule a subsequent UL data (or called a second UL data) transmission, in operation 402, the BS transmits UL scheduling information for a subsequent UL transmission in Msg. 4 of 4-step RACH procedure.
  • the UL scheduling information may be UL grant or a dedicated preamble in Msg. A of 2-step RACH procedure.
  • the subsequent UL data transmission may be UL small data or non-UL small data (such as, UL BSR/RAI) .
  • the subsequent UL transmission is transmitted based on the UL grant.
  • the UL scheduling information is a dedicated preamble in Msg. A of 2-step RACH procedure
  • the subsequent UL transmission is transmitted based on the dedicated preamble in Msg. A of 2-step RACH procedure.
  • the 2-step RACH procedure is more efficient, thus the BS may make the UE transmit this the subsequent UL transmission by 2-step RACH procedure by transmitting the dedicated preamble of 2-step RACH procedure.
  • the BS may also transmit indication information to indicate the UL grant or the dedicated preamble being applied for one shot, a plurality of shots, an entire small data transmission procedure for the UE in inactive mode or idle mode.
  • a new timer can be configured so that the UL grant or the dedicated preamble can be applied when the timer is running.
  • the UE transmits the subsequent UL data transmission based on the UL scheduling information, and then in operation 404, the UE monitors DL response message.
  • the BS transmits DL response message.
  • the feedback from the network can be short and does not need to include feedback (s) to multiple UEs.
  • the UE may monitor the DL response message in a short-size window or when a new timer is running (before a new timer expired) .
  • the BS may transmit the DL response message in the short-size window or when the new timer is running. If there is DL data to be transmitted, the DL data can be multiplexed in the DL response message and transmitted to the UE.
  • the DL response message may further include dedicated preamble resource for next UL data if needed.
  • the BS may transmit downlink (DL) assignment information for a subsequent DL transmission in Msg. 4 of 4-step RACH procedure, or the DL assignment information for the subsequent DL transmission may be transmitted along with the UL scheduling information for the subsequent UL transmission.
  • the BS may transmit the subsequent DL transmission based on the DL assignment information, or the subsequent DL transmission may be transmitted along with the DL response message.
  • the DL assignment could be a MAC CE or RRC message.
  • the DL assignment can be configured to being applied for one shot, a plurality of shots, an entire data transmission procedure, or when a timer is running. For example, the number of shot in a plurality of shots could be configured by network to UE.
  • a physical downlink control channel (PDCCH) configuration including CORSET and search space may be configured to the UE to receive the DL scheduling information, and the UE may receive the DL data based on the DL scheduling information.
  • PDCCH physical downlink control channel
  • the DL data transmission in SDT may be sparse, so the signaling overhead for the monitoring on DL scheduling information in SDT should be further reduced.
  • the UE may monitor the subsequent DL message (similarly to Msg. 4) over the dedicated PDCCH resource, and the dedicated PDCCH resource is limited in the PDCCH based on a DRX for SDT in inactive mode or idle mode.
  • the UE may receive the DL data based on the DL SPS configuration for SDT in inactive mode or idle mode.
  • the BS may transmit a DL data based on DRX or DL SPS; and correspondingly, the UE may monitor and receive the DL data based on DRX or DL SPS.
  • the BS may transmit one or more configuration of the DRX or the DL SPS for SDT in inactive mode or idle mode before 4-step RACH procedure to the UE.
  • the UE may receive and store the one or more configuration of the DRX or the DL SPS for SDT in inactive mode or idle mode before 4-step RACH procedure.
  • the configuration of the DRX or the DL SPS can be per data radio bearer (DRB) or per traffic pattern.
  • DRX for SDT or DL SPS for SDT in inactive mode or idle mode may be configured and received in a radio resource control (RRC) release message or in a RRC message when the UE transitions from a connected mode to the inactive mode, when the UE transitions from the connected mode to the idle mode, or when the UE is in the inactive mode or the idle mode.
  • RRC release message or the RRC message enables the UE in the inactive mode or in the idle mode to transmit or receive data, or transmit or receive data in configured grant (CG) resources.
  • CG configured grant
  • the BS may transmit to the UE indication information to indicate the DRX or DL SPS being applied for one shot, a plurality of shots, an entire small data transmission procedure for the UE in inactive mode or idle mode, or when a timer is running, or until the small data transmission procedure is ended.
  • the number of shot in a plurality of shots could by configured by network to the UE.
  • the UE may transmit to the BS indication information to indicate one configuration of the DRX or the DL SPS for small data transmission for the UE the inactive mode or the idle mode.
  • the indicated configuration may be its preferable DRX or DL SPS.
  • the BS may transmit one configuration of DRX or one or multiple dedicated configurations of DL SPS based on the indication information transmitted by the UE.
  • the BS may transmit one configuration of DRX or one or multiple dedicated configurations of DL SPS directly without the indication information from the UE.
  • the BS may transmit one or more configuration of the DRX or the DL SPS for SDT in inactive mode or idle mode in the 4-step RACH procedure to the UE.
  • the configuration of the DRX or the DL SPS may be received in the Msg. 2 or Msg. 4 in 4-step RACH procedure.
  • the UE may trigger the DRX or the DL SPS for SDT.
  • the UE will start to monitor the PDCCH on duration time based on the configuration of the DRX, and perform the UL or DL data transmission based on DRX mechanism.
  • the PDCCH resource including CORSET information and search space information could be configured in Msg. 4 of the 24-step RACH procedure.
  • the UE may store or release the configuration of the DRX or the DL SPS based on network indication or UE behavior.
  • the configuration of discontinuous reception (DRX) or DL semi-persistent scheduling (SPS) may be independently from the 2-step RACH procedure or the 4-step RACH procedure as above described in FIG. 3 and FIG. 4.
  • the UE may monitor and receive a DL data based on DRX or DL SPS.
  • the BS may transmit a DL data based on DRX or DL SPS; and correspondingly, the UE may monitor and receive the DL data based on DRX or DL SPS.
  • At least one configuration of DRX or DL SPS may be configured and received in a RRC release message or in a RRC message when the UE transitions from a connected mode to the inactive mode, when the UE transitions from a connected mode to the inactive mode, when the UE transitions from the connected mode to the idle mode, or when the UE is in the inactive mode or the idle mode, wherein the RRC release message or the RRC message enables the UE in the inactive mode or in the idle mode to transmit or receive data, or transmit or receive data in configured grant (CG) resources.
  • CG configured grant
  • the UE may transmit indication information to indicate one configuration of the DRX or the DL SPS for small data transmission for the UE in inactive mode or idle mode; and/or receive indication information to indicate one configuration of the DRX or one or more dedicated configuration of the DL SPS.
  • the UE may receive configuration of the DRX or the DL SPS in CG based small data transmission procedure for UE in inactive mode or idle mode.
  • the configuration of the DRX or the DL SPS is per data radio bearer (DRB) or per traffic pattern.
  • DRB data radio bearer
  • the UE may store or release the configuration of the DRX or the DL SPS based on network indication or UE behavior when small data transmission procedure for the UE in inactive mode or idle mode is ended.
  • the configuration of the DRX or the DL SPS is per data radio bearer (DRB) or per traffic pattern. It could be applied to UE in duration or until the end of small data transmission in UE inactive mode or idle mode.
  • DRB data radio bearer
  • FIG. 5 illustrates a flow chart of another method for subsequent data transmission according to some embodiments of the present application.
  • the method in FIG. 5 may be performed between a UE (such as, the UE 101 in FIG. 1 or the UE 201 in FIG. 2) which is in active mode or in idle mode and a BS (such as, the BS 102 in FIG. 1 or the BS 201a or the BS 201b in FIG. 2) .
  • a UE such as, the UE 101 in FIG. 1 or the UE 201 in FIG. 2
  • a BS such as, the BS 102 in FIG. 1 or the BS 201a or the BS 201b in FIG. 2 .
  • the 2-step RACH procedure has a higher priority compared to 4-step RACH procedure.
  • the UE is able to apply the 2-step RACH procedure if a value for the channel quality (such as, the measured reference signal received power (RSRP) on serving cell) is greater than the threshold for 2-step RACH procedure.
  • RSRP measured reference signal received power
  • the UE transmits a measurement result of a serving cell of the UE to the BS.
  • the BS transmits indication information to indicate that the UE is enable or disable to apply 2-step RACH procedure for small data transmission for the UE in inactive mode or idle mode based on the measurement result.
  • the BS may transmit indication information to indicate UE report that UE is enable or disable to apply CG resource for small data transmission for the UE in inactive mode or idle mode.
  • the UE transmits indication information to indicate that the UE is enable or disable to apply 2-step RACH procedure for small data transmission for the UE in inactive mode or idle mode, and/or to indicate that the UE is enable or disable to apply CG resource for small data transmission for the UE in inactive mode or idle mode.
  • the indication information may be MAC CE.
  • the BS After receiving the indication information from the UE, in operation 502, the BS transmits indication information to indicate the UE is able or disable to apply 2-step RACH procedure for small data transmission for the UE in inactive mode or idle mode, or indicate the UE is able or disable to apply CG resource for small data transmission for the UE in inactive mode or idle mode based on the indication information from the UE.
  • the BS may transmit indication information to trigger the UE report its availability to 2-step RACH procedure for small data transmission for the UE in inactive mode or idle mode, after receiving the indication information from the BS, in operation 501, the UE may transmit a measurement result of a serving cell of the UE to the BS or indication information to indicate that the UE be able or disable to transition to 2-step RACH procedure for small data transmission for the UE in inactive mode or idle mode.
  • the BS After receiving the measurement result or the indication information from the UE, in operation 502, the BS transmits indication information to indicate that the UE is able or disable to apply 2-step RACH procedure for small data transmission for the UE in inactive mode or idle mode and/or to indicate that the UE is able or disable to apply CG resource for small data transmission for the UE in inactive mode or idle mode based on the indication information from the UE.
  • the indication information is transmitted in small data transmission procedure in UE inactive mode or idle mode.
  • the indication information is transmitted in RRC message, system information block, or MAC CE.
  • radio network temporary identity for the UE in 4-step RACH procedure can be reused in 2-step RACH procedure.
  • the transition from 2-step RACH procedure for small data transmission to 4-step RACH procedure for small data transmission or the 4-step RACH procedure for small data transmission to 2-step RACH procedure for non-small data transmission is independently from the dedicated preamble as described in the method of FIG. 3.
  • the UE may initiate 4-step random access channel (RACH) procedure for small data transmission for the UE in inactive mode or idle mode, or initiate 2-step RACH procedure for non-small data transmission for the UE in inactive mode or idle mode, if PREAMBLE_TRANSMISSION_COUNTER for 2-step RACH procedure for small data transmission for the UE in inactive mode or idle mode is greater than a threshold, or equals to a threshold+1.
  • RACH 4-step random access channel
  • the BS may receive a UL data by 4-step random access channel (RACH) procedure for small data transmission for the UE in inactive mode or idle mode, or by 2-step RACH procedure for non-small data transmission for the UE in inactive mode or idle mode, if PREAMBLE_TRANSMISSION_COUNTER for 2-step RACH procedure for small data transmission for the UE in inactive mode or idle mode is greater than a threshold, or equals to a threshold+1.
  • RACH random access channel
  • the BS may transmit an indication to initiate the 4-step RACH procedure for small data transmission for the UE in inactive mode or idle mode, or to initiate the 2-step RACH procedure for non-small data transmission for the UE in inactive mode or idle mode, when PREAMBLE_TRANSMISSION_COUNTER for 2-step RACH procedure for small data transmission for the UE in inactive mode or idle mode is greater than the threshold, or equals to the threshold+1.
  • the UE may initiate the corresponding random access procedure based on the specified UE behavior, that is, the UE may directly initiate the 4-step RACH procedure for small data transmission for the UE in inactive mode or idle mode, or initiate the 2-step RACH procedure for non-small data transmission for the UE in inactive mode or idle mode, when PREAMBLE_TRANSMISSION_COUNTER for 2-step RACH procedure for small data transmission for the UE in inactive mode or idle mode is greater than the threshold, or equals to the threshold+1.
  • the UE may receive the threshold by at least one of RRC message, system information blocks, or MAC CE.
  • the UE may receive from the BS (the network) UL grant for Msg. 3 transmission with UL data from network if the UE initiates 4-step RACH procedure for small data transmission for the UE in inactive mode or idle mode.
  • the UE may initiate 2-step RACH procedure for non-small data transmission for the UE in inactive mode or idle mode, if the UE is in 4-step RACH procedure for small data transmission for the UE in inactive mode or idle mode.
  • the BS may receive a UL data by 2-step RACH procedure for non-small data transmission for the UE in inactive mode or idle mode, if the UE is in 4-step RACH procedure for small data transmission for the UE in inactive mode or idle mode.
  • the UE may initiate 2-step RACH procedure for non-small data transmission for the UE in inactive mode or idle mode based on specified UE behavior or network indication, if the UE initiates 4-step RACH procedure for small data transmission for the UE in inactive mode or idle mode, if the PREAMBLE_TRANSMISSION_COUNTER for 4-step RACH procedure for small data transmission for the UE in inactive mode or idle mode is greater than a threshold, or equals to a threshold+1.
  • the BS may receive a UL data by 2-step RACH procedure for non-small data transmission for the UE in inactive mode or idle mode based on specified UE behavior or network indication, if the UE initiates 4-step RACH procedure for small data transmission for the UE in inactive mode or idle mode, if the PREAMBLE_TRANSMISSION_COUNTER for 4-step RACH procedure for small data transmission for the UE in inactive mode or idle mode is greater than a threshold, or equals to a threshold+1.
  • the threshold could be configured by network.
  • the subsequent UL data or a subsequent UL data could be the UL data transmitted in Msg. A, or Msg. 3 or CG based resource, or could be the UL data which has been transmitted by UE.
  • the subsequent DL data or a subsequent DL data could be the DL data transmitted in Msg. B , or Msg. 4, or could be the DL data which has been transmitted by UE.
  • the data transmission or small data transmission may mean that a UE in inactive mode or idle mode could transmit the data to network, or receive the data from the network.
  • the details could be as follows:
  • An inactive UE may have a CN connection in a cell (e.g., cell A) associated with its last serving BS (also referred to as "anchor BS" ) . However, in some scenarios, the inactive UE may perform data transmission via another cell (cell B) .
  • the data transmission may include at least one of an uplink data transmission and downlink data transmission.
  • the inactive UE may initiate an uplink data transmission via cell B, establish a RAN connection with cell B, enter the connected mode, and then perform the data transmission.
  • the inactive UE may initiate an uplink data transmission via cell B and still stay in inactive mode in the data transmission procedure.
  • An idle UE may act similarly.
  • the inactive or idle UE may receive a suspend message or release message from cell B and then go back to the inactive or idle mode. Or, after the completion of the data transmission, the inactive or idle UE may receive a suspend message or release message from cell B and the UE still stay in inactive or idle mode in the data transmission procedure.
  • the suspend message or release message is an RRC message.
  • the data size in such data transmission may be no larger than the maximum transport block (TB) size that can be applied in one transmission, as defined in standard protocols. Small data transmission is one of such scenarios.
  • TB maximum transport block
  • the embodiments of the present application can perform the subsequent UL/DL data transmission with less scheduling information.
  • FIG. 6 illustrates an apparatus according to some embodiments of the present application.
  • the apparatus 600 may be the UE 101 as illustrated in FIG. 1, the UE 201 as illustrated in FIG. 2 or other embodiments of the present application.
  • the apparatus 600 may include a receiver 601, a transmitter 603, a processer 605, and a non-transitory computer-readable medium 607.
  • the non-transitory computer-readable medium 607 has computer executable instructions stored therein.
  • the processer 605 is configured to be coupled to the non-transitory computer readable medium 607, the receiver 601, and the transmitter 603.
  • the apparatus 600 may include more computer-readable mediums, receiver, transmitter and processors in some other embodiments of the present application according to practical requirements.
  • the receiver 601 and the transmitter 603 can be integrated into a single device, such as a transceiver.
  • the apparatus 600 may further include an input device, a memory, and/or other components.
  • the non-transitory computer-readable medium 607 may have stored thereon computer-executable instructions to cause the apparatus 600 to implement the method according to embodiments of the present application.
  • FIG. 7 illustrates another apparatus according to some embodiments of the present application.
  • the apparatus 700 may be the BS 102 as illustrated in FIG. 1, the BS 202 as illustrated in FIG. 2 or other embodiments of the present application.
  • the apparatus 700 may include a receiver 701, a transmitter 703, a processer 705, and a non-transitory computer-readable medium 707.
  • the non-transitory computer-readable medium 707 has computer executable instructions stored therein.
  • the processer 705 is configured to be coupled to the non-transitory computer readable medium 707, the receiver 701, and the transmitter 703.
  • the apparatus 700 may include more computer-readable mediums, receiver, transmitter and processors in some other embodiments of the present application according to practical requirements.
  • the receiver 701 and the transmitter 703 are integrated into a single device, such as a transceiver.
  • the apparatus 700 may further include an input device, a memory, and/or other components.
  • the non-transitory computer-readable medium 707 may have stored thereon computer-executable instructions to cause the apparatus 700 to implement the method according to embodiments of the present application.
  • a software module may reside in RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, registers, a hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.
  • the steps of a method may reside as one or any combination or set of codes and/or instructions on a non-transitory computer-readable medium, which may be incorporated into a computer program product.
  • the terms “comprises, “ “comprising, “ or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
  • An element proceeded by “a, “ “an, “ or the like does not, without more constraints, preclude the existence of additional identical elements in the process, method, article, or apparatus that comprises the element.
  • the term “another” is defined as at least a second or more.
  • the terms “including, “ “having, “ and the like, as used herein, are defined as “comprising. "

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

Abstract

Des modes de réalisation de la présente demande concernent un procédé et un appareil pour une transmission de données subséquente. Dans un mode de réalisation de la présente demande, le procédé consiste notamment à : transmettre des premières données en liaison montante (UL) dans Msg.A d'une procédure de canal d'accès aléatoire (RACH) en deux étapes ; recevoir une ressource pour un préambule spécialisé pour une transmission de données UL subséquente ; transmettre la transmission de données UL subséquente sur la base du préambule spécialisé ; et surveiller un message de réponse en liaison descendante (DL).
PCT/CN2020/122572 2020-10-21 2020-10-21 Procédé et appareil de transmission de données subséquente WO2022082522A1 (fr)

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WO2023214919A1 (fr) * 2022-05-02 2023-11-09 Telefonaktiebolaget Lm Ericsson (Publ) Procédés pour améliorer des capacités d'économie d'énergie pour un ue après la réception de données dl dans une mt-sdt

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CN110574484A (zh) * 2019-07-25 2019-12-13 北京小米移动软件有限公司 随机接入方法、装置及存储介质
WO2020087280A1 (fr) * 2018-10-30 2020-05-07 Qualcomm Incorporated Configurations pour la transmission de petites données

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WO2020087280A1 (fr) * 2018-10-30 2020-05-07 Qualcomm Incorporated Configurations pour la transmission de petites données
CN110574484A (zh) * 2019-07-25 2019-12-13 北京小米移动软件有限公司 随机接入方法、装置及存储介质

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QUALCOMM INCORPORATED: "Remaining solution options for MT-initiated DL EDT", 3GPP DRAFT; R2-1906444 MT EDT, vol. RAN WG2, 3 May 2019 (2019-05-03), Reno, Nevada, USA, pages 1 - 10, XP051710759 *
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023214919A1 (fr) * 2022-05-02 2023-11-09 Telefonaktiebolaget Lm Ericsson (Publ) Procédés pour améliorer des capacités d'économie d'énergie pour un ue après la réception de données dl dans une mt-sdt

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