WO2020164006A1 - 切换网络设备的方法、终端设备和网络设备 - Google Patents

切换网络设备的方法、终端设备和网络设备 Download PDF

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Publication number
WO2020164006A1
WO2020164006A1 PCT/CN2019/074943 CN2019074943W WO2020164006A1 WO 2020164006 A1 WO2020164006 A1 WO 2020164006A1 CN 2019074943 W CN2019074943 W CN 2019074943W WO 2020164006 A1 WO2020164006 A1 WO 2020164006A1
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WIPO (PCT)
Prior art keywords
network device
terminal device
time period
time
message
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PCT/CN2019/074943
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English (en)
French (fr)
Inventor
唐珣
陈君
张戬
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华为技术有限公司
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Priority to PCT/CN2019/074943 priority Critical patent/WO2020164006A1/zh
Publication of WO2020164006A1 publication Critical patent/WO2020164006A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/08—Reselecting an access point
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/34—Reselection control

Definitions

  • This application relates to the field of communications, and more specifically to a method for switching network equipment, terminal equipment and network equipment.
  • the terminal device may switch to serving network devices according to changes in signal strength or load balancing requirements on the network device side.
  • LTE long term evolution
  • the terminal device when the terminal device receives the switching command, the terminal device will disconnect the radio resource control (RRC) connection with the source network device, and then start the random access process for the target network device. After sending the handover complete message to the target network device, the terminal device restores the RRC connection.
  • RRC radio resource control
  • a connection maintenance method of make-before-break is proposed.
  • the main improvement is: when the terminal device receives the handover command, it does not immediately interrupt the connection with the source network device, but continues to maintain the terminal device's first uplink transmission to the target network device. For example, after the terminal device receives the handover command, it still maintains the communication with the source network device, until the terminal device sends the random access preamble to the target network device. In this way, during the random access process between the terminal device and the target network device, the data transmission is interrupted, which reduces the time of data interruption.
  • an enhanced make-before-break (eMBB) solution (or called a simultaneous connection switching solution) is proposed, that is, a solution in which a terminal device is simultaneously connected to a source network device and a target network device.
  • eMBB enhanced make-before-break
  • the data transmission and reception for the source network device and the data transmission and reception for the target network device can be performed independently without affecting each other, so no additional process design is required.
  • a terminal device with dual receiving and single sending it can receive downlink data sent by two network devices at the same time, but can only send uplink data to one network device at any time.
  • the present application provides a method for switching network equipment, terminal equipment, and network equipment, which enable a terminal equipment with dual-receiving and single-transmitting to complete the random access process for the target network equipment while transmitting data with the source network equipment.
  • the present application provides a method for switching network equipment.
  • the method includes: a terminal device receives a handover message sent by a first network device, where the handover message is used to instruct the terminal device to switch from the first network device to the first network device.
  • Two network devices, or indicating at least one handover candidate network device, the at least one handover candidate network device includes the second network device; the terminal device sends first indication information to the first network device, and the first indication information is used to indicate The first time period; within the first time period, the terminal device sends an access message to the second network device, and the access message is used to access the second network device; outside the first time period, the The terminal device sends uplink data to the first network device according to the scheduling instruction of the first network device.
  • the terminal device when the terminal device needs to switch from the first network device to the second network device, it indicates a period of time to the first network device, during which the terminal device sends an access message to the second network device, outside this time period, the terminal device can send uplink data to the first network device, that is, the terminal device is only sending access messages (for example, random access preamble, handover complete message, or reconfiguration) to the second network device.
  • the terminal device When the message is completed), the uplink data transmission with the first network device is interrupted.
  • the terminal device when the terminal device randomly accesses the second network device, the terminal device at other times outside this time period can also send uplink data to the first network device, so that the terminal device with double-receiving and single-transmitting can communicate with the source
  • the network device completes the random access process for the target network device while transmitting data.
  • the terminal device indicates the first time period for sending the access message to the second network device. In this way, only when the terminal device determines to switch to the second network device, the terminal device can apply or instruct the first network device for a period of time so as to send an access message to the second network device, thereby reducing resource occupation.
  • the first indication information includes at least one of the duration and the end time of the first time period, and the start time.
  • the first time period is determined by the terminal device and indicated to the first network device through the first indication information, that is, the first time period is not scheduled or pre-configured by the first network device, which can reduce Signaling interaction between the terminal device and the first network device.
  • the method before the terminal device sends the first indication information to the first network device, the method further includes: the terminal device sends second indication information to the first network device, and the second indication The information is used to indicate a time period set, the time period set includes multiple time periods, and the multiple time periods include the first time period; the first indication information is used to indicate the first time period in the time period set.
  • the terminal device may indicate to the first network device that it is likely to be used for sending the access message before indicating the first time period for sending the access message.
  • the time period of the message is set, so that the network device pre-configures multiple time periods for the terminal device, so that the first network device can better configure the multiple time periods.
  • the second indication information is specifically used to indicate at least one of the duration and end time of the second time period, as well as the start time and the period of the second time period, and multiple periodic occurrences.
  • the second time period constitutes the multiple time periods.
  • the network device can indicate a time period and the period in which the time period occurs through the terminal device, and configure multiple time periods for the terminal device.
  • the random access resource allocated by the second network device to the terminal device is a sub Frame 2
  • the terminal device can indicate to the first network device a time period containing subframe 2 and indicate that the period is each system frame, then the first network device configures the terminal device with a subframe 2 in each system frame Time period.
  • the access message is a random access preamble, a handover complete message, or a reconfiguration complete message.
  • the time-frequency resource used for transmitting the first indication information is pre-configured, and the time-frequency resource used for transmitting the first indication information appears periodically.
  • the network device pre-configures the terminal device with a resource for transmitting the first indication information, for example, configures a UL-grant, so that the terminal device can send the first indication information faster.
  • the method further includes: after the first time period, the terminal device sends a feedback message to the first network device, where the feedback message is used to indicate that the second network device is in the first time period. Whether the downlink transmission between a network device and the terminal device is successful.
  • the first network device may send downlink data to the terminal device in the first time period, and the terminal device cannot send uplink data to the first network device in the first time period, this will cause the Inside, the ACK or NACK for the downlink data is not fed back to the first network device.
  • the terminal device feeds back the ACK or NACK in the first time period through a feedback message. In this way, the reliability of data transmission between the first network device and the terminal device can be improved.
  • the feedback message includes feedback information of each downlink transmission, or feedback information of each subframe, or feedback information of each HARQ process of hybrid automatic repeat request.
  • the time-frequency resource used for transmitting the feedback message is pre-configured, and the time-frequency resource used for transmitting the feedback message appears periodically.
  • the network device pre-configures the resource for transmitting the feedback message for the terminal device, for example, configures a UL-grant, so that the terminal device can send the feedback message faster.
  • the present application provides a method for switching network devices, the method comprising: a first network device sends a switching message to a terminal device, the switching message is used to instruct the terminal device to switch from the first network device to the second network Device, or indicate at least one handover candidate network device, the at least one handover candidate network device includes the second network device; the first network device receives the first indication information sent by the terminal device, and the first indication information is used to indicate the first A period of time, the first period of time is a period during which the terminal device sends an access message to the second network device, and the access message is used to access the second network device, where the terminal device accesses the second network A time period other than the first time period in the process of the device is a time period during which the terminal device sends uplink data to the first network device.
  • the terminal device when the terminal device needs to switch from the first network device to the second network device, it indicates a period of time to the first network device, during which the terminal device sends an access message to the second network device, Outside this time period, the terminal device sends uplink data to the first network device, that is, the terminal device is only sending an access message (for example, random access preamble, handover complete message, or reconfiguration complete) to the second network device. Message), the uplink data transmission with the first network device is interrupted.
  • an access message for example, random access preamble, handover complete message, or reconfiguration complete
  • the terminal device when the terminal device randomly accesses the second network device, the terminal device at other times outside this time period can also send uplink data to the first network device, so that the terminal device with double-receiving and single-transmitting can communicate with the source
  • the network device completes the random access process for the target network device while transmitting data.
  • the terminal device indicates the first time period for sending the access message to the second network device. In this way, only when the terminal device determines that the network device is to be switched, the terminal device can apply or instruct the first network device for a period of time, so as to send an access message to the second network device, thereby reducing resource occupation.
  • the first indication information includes at least one of the duration and the end time of the first time period, and the start time.
  • the first time period is determined by the terminal device and indicated to the first network device through the first indication information, that is, the first time period is not scheduled or pre-configured by the first network device, which can reduce Signaling interaction between the terminal device and the first network device.
  • the method before the first network device receives the first instruction information sent by the terminal device, the method further includes: the first network device receives second instruction information sent by the terminal device, and the first network device 2.
  • the indication information is used to indicate a time period set, the time period set includes multiple time periods, and the multiple time periods include the first time period; the first indication information is used to indicate the first time in the time period set segment.
  • the terminal device may indicate to the first network device that it is likely to be used for sending the access message before indicating the first time period for sending the access message.
  • the time period of the message is set, so that the network device pre-configures multiple time periods for the terminal device, so that the first network device can better configure the multiple time periods.
  • the second indication information is specifically used to indicate at least one of the duration and end time of the second time period, as well as the start time and the period of the second time period, and multiple periodic occurrences.
  • the second time period constitutes the multiple time periods.
  • the network device can indicate a time period and the period in which the time period occurs through the terminal device, and configure multiple time periods for the terminal device.
  • the random access resource allocated by the second network device to the terminal device is a sub Frame 2
  • the terminal device can indicate to the first network device a time period containing subframe 2 and indicate that the period is each system frame, then the first network device configures the terminal device with a subframe 2 in each system frame Time period.
  • the method before the first network device receives the first indication information sent by the terminal device, the method further includes: the first network device according to the random allocation of the second network device to the terminal device Access resources, configure a time period set for the terminal device, the time period set includes multiple time periods, the multiple time periods include the first time period; the first indication information is used to indicate the time period set in the time period set The first time period.
  • the second network device sends a handover confirmation message to the first network device, which indicates that the dedicated random access resource allocated to the terminal device is subframe 2.
  • the first network device obtains the configuration information, the first network device A time period including subframe 2 can be configured for the terminal device in each system frame.
  • the access message is a random access preamble, a handover complete message, or a reconfiguration complete message.
  • the time-frequency resource used for transmitting the first indication information is pre-configured, and the time-frequency resource used for transmitting the first indication information appears periodically.
  • the network device pre-configures the terminal device with a resource for transmitting the first indication information, for example, configures a UL-grant, so that the terminal device can send the first indication information faster.
  • the method further includes: after the first time period, the first network device receives a feedback message sent by the terminal device, where the feedback message is used to indicate that the Whether the downlink transmission between the first network device and the terminal device is successful.
  • the first network device may send downlink data to the terminal device in the first time period, and the terminal device cannot send uplink data to the first network device in the first time period, this will cause the Inside, the ACK or NACK for the downlink data is not fed back to the first network device.
  • the terminal device after the first time period, the terminal device immediately feeds back the ACK or NACK in the first time period through a feedback message. In this way, the reliability of data transmission between the first network device and the terminal device can be improved.
  • the feedback message includes feedback information of each downlink transmission, or feedback information of each subframe, or feedback information of each HARQ process of hybrid automatic repeat request.
  • the time-frequency resource used for transmitting the feedback message is pre-configured or scheduled by the first network device, and the time-frequency resource used for transmitting the feedback message appears periodically.
  • the network device pre-configures the resource for transmitting the feedback message for the terminal device, for example, configures a UL-grant, so that the terminal device can send the feedback message faster.
  • the present application provides a terminal device, including a module for executing the first aspect or any one of the implementation manners of the first aspect.
  • this application provides a network device, including a module for executing the second aspect or any one of the implementation manners of the second aspect.
  • the present application provides a chip, including a transceiver, a processor, and a memory, for executing the method described in the first aspect or any one of the implementation manners of the first aspect.
  • the present application provides a chip, including a transceiver, a processor, and a memory, for executing the method described in the second aspect or any one of the implementation manners of the second aspect.
  • the present application provides a terminal device, including a transceiver, a processor, and a memory, configured to execute the method described in the first aspect or any one of the implementation manners of the first aspect.
  • the present application provides a network device, including a transceiver, a processor, and a memory, for executing the method described in the second aspect or any one of the implementation manners of the second aspect.
  • the present application provides a computer-readable storage medium, including instructions, which when run on a terminal device, cause the terminal device to execute the method described in the first aspect or any one of the implementation manners of the first aspect.
  • this application provides a computer-readable storage medium, including instructions, which when run on a network device, cause the network device to execute the method described in the second aspect or any one of the implementation manners of the second aspect.
  • this application provides a computer program product that, when running on a terminal device, causes the terminal device to execute the method described in the first aspect or any one of the implementation manners of the first aspect.
  • the present application provides a computer program product that, when running on a network device, causes the network device to execute the method described in the second aspect or any one of the implementation manners of the second aspect.
  • Figure 1 is a schematic diagram of a network device switching process.
  • Figure 2 is a schematic diagram of the eMBB handover process.
  • Fig. 3 is a system architecture diagram to which the technical solutions of the embodiments of the present application can be applied.
  • Fig. 4 is another system architecture diagram to which the technical solution of the embodiment of the present application can be applied.
  • FIG. 5 is another system architecture diagram to which the technical solutions of the embodiments of the present application can be applied.
  • Figure 6 is a schematic diagram of random access preamble resources.
  • Figure 7 is a timing diagram of random access.
  • FIG. 8 is a schematic flowchart of a method for switching network devices according to an embodiment of the present application.
  • FIG. 9 is a schematic flowchart of a method for switching network devices according to another embodiment of the present application.
  • FIG. 10 is a schematic flowchart of a method for switching network devices according to another embodiment of the present application.
  • Figure 11 is a sequence diagram of the retransmission of the access message msg3.
  • Fig. 12 is an overall timing diagram of information interaction between a terminal device and a first network device and a second network device in an embodiment of the present application.
  • FIG. 13 is a schematic structural diagram of a terminal device according to an embodiment of the present application.
  • FIG. 14 is a schematic structural diagram of a network device according to an embodiment of the present application.
  • FIG. 15 is a schematic structural diagram of a terminal device provided by another embodiment of the present application.
  • FIG. 16 is a schematic structural diagram of a network device provided by another embodiment of the present application.
  • GSM global system for mobile communications
  • CDMA code division multiple access
  • WCDMA broadband code division multiple access
  • GPRS general packet radio service
  • LTE long term evolution
  • FDD frequency division duplex
  • TDD LTE Time division duplex
  • UMTS universal mobile telecommunication system
  • WiMAX worldwide interoperability for microwave access
  • the terminal equipment in the embodiments of this application may refer to user equipment, access terminals, user units, user stations, mobile stations, mobile stations, remote stations, remote terminals, mobile equipment, user terminals, terminals, wireless communication equipment, user agents, or User device.
  • the terminal device can also be a cellular phone, a cordless phone, a session initiation protocol (session initiation protocol, SIP) phone, a wireless local loop (WLL) station, a personal digital assistant (personal digital assistant, PDA), with wireless communication Functional handheld devices, computing devices, or other processing devices connected to wireless modems, in-vehicle devices, wearable devices, terminal devices in the future 5G network or future evolution of the public land mobile network (PLMN) Terminal equipment, etc., this embodiment of the present application does not limit this.
  • the terminal device may receive a handover command sent by the network device, and maintain data transmission with the source base station during the handover process.
  • the network device in the embodiment of the application may be a device used to communicate with terminal devices.
  • the network device may be a global system for mobile communications (GSM) system or code division multiple access (CDMA)
  • GSM global system for mobile communications
  • CDMA code division multiple access
  • the base transceiver station (BTS) in the LTE system can also be the base station (NodeB, NB) in the wideband code division multiple access (WCDMA) system, or the evolved base station (evolved) in the LTE system.
  • NodeB, eNB, or eNodeB it can also be a centralized unit (CU), a distributed unit (DU), or a wireless radio access network (cloud radio access network, CRAN) scenario.
  • CU centralized unit
  • DU distributed unit
  • CRAN wireless radio access network
  • the controller or the network device may be a relay station, an access point, a vehicle-mounted device, a wearable device, a network device in a future 5G network or a network device in a future evolved PLMN network, etc., which are not limited in the embodiment of the present application.
  • the network device in the embodiment of the present application can configure transmission resources for the terminal device, and can perform cooperation between the network devices.
  • Fig. 3 is a system architecture diagram to which the technical solutions of the embodiments of the present application can be applied.
  • the LTE communication system there may be multiple cells under each eNB, and the UE in each cell and the eNB to which it belongs can all use the technical solutions of the embodiments of the present application.
  • Fig. 4 is another system architecture diagram to which the technical solution of the embodiment of the present application can be applied.
  • a gNB under a gNB, there may be one or more transmission and reception points (TRP), and each gNB or TRP and the terminal equipment served by it can apply the technology of the embodiments of this application Program.
  • TRP transmission and reception points
  • FIG. 5 is another system architecture diagram to which the technical solutions of the embodiments of the present application can be applied.
  • CU centralized unit
  • DU distributed unit
  • TRP is only a radio frequency unit or an antenna device
  • DU can implement protocol stack functions.
  • DU can implement radio link control (RLC) layer and Physical layer functions.
  • RLC radio link control
  • the process of switching network devices will be described with reference to Figure 2.
  • the first network device in FIG. 2 corresponds to the source network device, and the second network device corresponds to the target network device.
  • the specific switching process is as follows.
  • the terminal device and the source network device execute 101 and 102; the source network device executes 103 according to the measurement report sent by the terminal device; when the source network device determines that the terminal device needs to switch the network device, execute 104 to send to the target The network device sends a handover request; the target network device executes 105 to perform admission control according to its own situation.
  • the second network device determines that the terminal device is allowed to access, executes 106 to send a handover confirmation message to the source network device; the source network device is in After receiving the handover confirmation message sent by the target network device, execute 107 to send a handover command to the terminal device.
  • the terminal device starts to randomly access the target network device.
  • the terminal device executes 108 to send a random access preamble (also called msg1) to the target network device; after the target network device successfully detects the preamble, executes 109 to send a random access response message (also called msg2) to the terminal device ; After receiving the random access response message, the terminal device executes 110 to send a reconfiguration complete message (also called msg3) to the target network device.
  • a reconfiguration complete message also called msg3
  • the target network device sends a contention resolution message (also called msg4). After the terminal device successfully receives the correct contention resolution message, the random access process is completed, and 111 is executed. After the terminal device completes the communication with the target network device, the target network device executes 112 to release the user.
  • a contention resolution message also called msg4
  • the terminal device After the terminal device receives the handover command, it still maintains communication with the source network device, that is, the terminal device is simultaneously connected to the source network device and the target network device. In other words, even in the random access process between the terminal device and the target network device, the connection between the terminal device and the source network device is not interrupted.
  • a terminal device with dual-transmit and dual-receive capabilities data transmission and reception for the source network device and data transmission and reception for the target network device can be performed independently without affecting each other, so no additional process design is required. But for a terminal device with dual-receiving and single-transmitting, it can receive the downlink data sent by two network devices at the same time, but it can only send uplink data to one network device at any time, and considering the radio frequency channel switching and two networks Different synchronization time points of the equipment may not be able to achieve instantaneous switching, so the conversion time of uplink transmission needs to be considered. For such a terminal device, in the process of randomly accessing the target network device in the eMBB handover process, the terminal device needs to consider how to allocate the uplink transmission capability between the two network devices.
  • the resource configuration for msg1 includes cell public configuration and terminal equipment level configuration. For public configuration, the most important thing is to configure the index value. As shown in Figure 6, taking the LTE system index value of 10 as an example, it represents that the current msg1 format is 0, and subframes 2, 5, and 8 on any frame have msg1 resources available. It can be seen that msg1 resources appear periodically.
  • Figure 7 is a timing diagram of random access. As shown in Figure 7, the frame numbers are N, N+1 and N+2 respectively.
  • the terminal device sends msg1 in subframe 5 of frame N, and receives msg2 within the receiving time window of msg2, specifically in subframe 4 of frame N+1, and then 4 subframes later, that is, subframe of frame N+1 8.
  • the UE sends msg3, and for the contention random access process, the UE will receive msg4 subsequently.
  • the uplink capabilities of the terminal equipment are further divided by time. Within a period of time, the uplink capability of the terminal device is only used to send to the target network device, while outside the time range, the uplink capability of the terminal device is used to send to the source network device. In this way, the terminal device with dual receipt and single transmission can complete the random access process for the target network device while performing data transmission with the source network device.
  • FIG. 8 is a schematic flowchart of a method for switching network devices according to an embodiment of the present application.
  • the method shown in FIG. 8 includes at least part of the following content, wherein the first network device may be a source network device, and the second network device may be a target network device.
  • the terminal device receives a handover message sent by the first network device, where the handover message is used to instruct the terminal device to switch from the first network device to the second network device, or to instruct at least one switch candidate network device, the at least one The handover candidate network device includes the second network device.
  • the switching message may correspond to the switching command above.
  • the handover message may instruct the terminal device to switch to the second network device.
  • the handover message only indicates the second network device, and after receiving the handover message, the terminal device initiates a random access process to the second network device.
  • the handover message may indicate at least one handover candidate network device.
  • the terminal device may not switch the network device immediately after receiving the handover message.
  • the terminal device may switch from the at least one handover candidate network device.
  • the network device determines the second network device, and then initiates a random access process to the second network device.
  • the handover message can only provide the terminal device with a network device that is a candidate for handover.
  • the switching candidate network device is the network device that the terminal device can switch to.
  • the handover message may include a dedicated random access resource allocated by the second network device to the terminal device, that is, the resource is only used by the current terminal device, and it is non-competitive random access at this time; if the handover message It does not include the dedicated random access resource allocated by the second network device to the terminal device, that is, the random access resource may be shared by multiple terminal devices. In this case, it is competing random access.
  • the terminal device when the terminal device successfully receives msg2, it can be considered that the terminal device has switched from the first network device to the second network device. After that, the terminal device will no longer send uplink to the first network device. Data, so only the time period for sending msg1 needs to be considered; and for competitive random access, the terminal device needs to receive msg4 before it can be considered that the terminal device switches from the first network device to the second network device. Therefore, it is also necessary to consider sending The time period of msg3 is the time period for sending msg1 and msg3.
  • the terminal device sends first indication information to the first network device, where the first indication information is used to indicate the first time period.
  • the first indication information is used to indicate specific configuration information of the first time period. That is, the terminal device determines the first time period and instructs the first network device.
  • the first network device will not pre-configure the first time period for the terminal device to send the access message to the second network device, but the terminal device determines the first time period according to the selected resource. And instruct the first network device.
  • the first network device configures a corresponding time period for the terminal device or the first network device only needs to confirm receipt of the instruction information.
  • the above technical solution can be applied to a scenario where the second network device does not configure dedicated random access resources for the terminal device.
  • the first network device cannot learn the dedicated random access resources of the terminal device and cannot be configured in advance. The first time period.
  • the first indication information indicates the start time and end time of the first time period, or indicates the start time and duration of the first time period.
  • the first indication information indicates that the starting subframe is subframe 1 and the duration is 3 subframes, that is, the first time period is subframe 1 to subframe 3.
  • the first indication information indicates that the start subframe is subframe 1, and the end subframe is subframe 9, that is, the first time period is subframe 1 to subframe 9.
  • the terminal device Before sending the first indication information to the first network device, the terminal device determines the first time period according to the selected resource for transmitting the access message.
  • the first time period should include the resources selected by the terminal device.
  • the resource selected by the terminal device is subframe 2, and then it may be determined that the first time period is subframe 2, or subframe 1 to subframe 3, or subframe 1 to subframe 2, and so on.
  • the resources selected by the terminal device are subframes 2, 5, and 8, and it may be determined that the first time period is subframe 1 to subframe 9, and so on.
  • the first indication information may also directly indicate the resource location selected by the terminal device (for example, frame number + subframe number, etc.), and the first network device determines the first time period.
  • the first network device configures the terminal device with a first time period including subframe 2.
  • the first indication information may also be used to indicate the first time period in the time period set, and any time period in the time period set may be used to send an access message to the second network device.
  • the first network device pre-configures a time period set for the terminal device, and the first indication information is used to indicate the first time period to be used by the terminal device in the time period set.
  • the first time period is a certain time period in the time period set after the first network device receives the first indication information, such as the first time period.
  • 910 may be executed before 820, and the first network device may pre-configure a time period set for the terminal device according to the second indication information sent by the terminal device.
  • the second indication information may include at least one of the duration and the end time of the second time period, and the start time and the period of the second time period, and a plurality of the second time periods appearing periodically constitutes The multiple time periods. That is, the terminal device indicates to the first network device the second time period and the period in which the second time period occurs.
  • the start position + duration can be adopted, for example, the start subframe is subframe 3, and the duration is 3 subframes; or the start location + end location can also be adopted.
  • the start position is subframe 3, and the end position is subframe 6.
  • the terminal device and the second network device may indicate the period of the second time period in an explicit, implicit or non-indicating manner. For example, it may be assumed that the period of the second time period is equal to the period of random access resources. For another example, if only the subframe number is included in the description of the second time period but the frame number is not included, it indicates that the second time period occurs in every frame or the period is the same as that of the random access resource.
  • the description of the second time period includes a frame number, it indicates that you can select any frame to set the start position and end position of the second time period, and you can specify a different random access resource occurrence for the second time period.
  • the period of the cycle if the description of the second time period includes a frame number, it indicates that you can select any frame to set the start position and end position of the second time period, and you can specify a different random access resource occurrence for the second time period.
  • each second time period includes at least one subframe that can be used to send an access message to the second network device.
  • the second time period includes subframe 2 that can be used to send an access message to the second network device, or the second time period includes subframes 2, 5, and 8 that can be used to send an access message to the second network device.
  • the second indication information may indicate the duration and time interval of each time period in the time period set.
  • the second indication information may indicate that the duration of each time period is 1 subframe, and the time interval is 3 subframes (subframe 2 and subframe). Between frame 5), 3 subframes (between subframe 5 and subframe 8), 4 subframes (between subframe 8 and subframe 2 in the next frame), and so on.
  • time interval between the time periods in the time period set may also occur periodically.
  • the first network device may also configure a time period set for the terminal device according to the random access resource allocated by the second network device to the terminal device.
  • the handover confirmation message sent by the second network device to the first network device indicates that the dedicated random access resource allocated to the terminal device is subframe 2.
  • the first network device may Configure a time period including subframe 2 for the terminal device in each system frame. This configuration can be included in the handover command or sent to the terminal device as a separate RRC message.
  • the resource for transmitting the first indication information may be pre-configured by the first network device.
  • the first network device may simultaneously pre-configure the uplink resource UL-Grant for the terminal device before each time period in the time period set, so as to transmit the first indication information.
  • the time position may be indicated by the frame number+subframe number, or indicated by the subframe number alone.
  • the uplink resource may appear periodically, the period may be consistent with the first time period, or may be configured separately.
  • the pre-configured UL-Grant can save the process of applying for resources and can send the first indication information faster.
  • the resource for transmitting the first indication information may be requested by the terminal device from the first network device.
  • the terminal device applies to the first network device through a scheduling request (schedule request, SR) for the uplink resource used to transmit the first indication information.
  • SR scheduling request
  • This method requires a certain time delay due to the application process, but it can improve resource utilization.
  • the first indication information may be a media access control layer control element (media access controls control element, MAC CE) message or an RRC message.
  • media access control layer control element media access controls control element, MAC CE
  • RRC message an RRC message.
  • the terminal device after sending the first indication information, the terminal device does not need to wait for the feedback message of the first network device, and directly starts sending msg1 at the corresponding position.
  • the terminal device in the first time period, sends an access message to the second network device, where the access message is used to access the second network device.
  • the access message may be a random access preamble, a handover complete message, or a reconfiguration complete message. That is to say, the sending of the random access preamble, the handover complete message, or the reconfiguration complete message can all adopt the technical method of the embodiment of the present application.
  • the terminal device can still receive the downlink data of the first network device, including the new transmission and retransmission of the downlink data. Therefore, as shown in Figure 10, 1010 can be executed after 830. If the start and end time of the first time period are determined, then the terminal device receives the downlink data and determines the confirmation of the downlink data of each subframe ( After acknowledgement (ACK) or negative acknowledgement (NACK), after the first time period, the downlink data of the first time period can be uniformly fed back.
  • ACK acknowledgement
  • NACK negative acknowledgement
  • the terminal device may respond to the feedback information of each downlink transmission in the first time period, or the feedback information of each subframe, or each hybrid automatic repeat request (HARQ) process. Feedback.
  • HARQ hybrid automatic repeat request
  • the feedback information may use 1 bit to indicate the ACK/NACK status (for example, 1 indicates ACK, 0 indicates NACK).
  • the start time of the first time period is subframe 2
  • the length is 5 subframes, that is, the end time of the first time period is subframe 6.
  • the first network device is in subframe 3 and 4 Downlink data is sent, no data is sent in other subframes, and the detection results are all ACKs. In this way, the terminal device feeds back two bits, and both bits are 1. If two transport blocks (TB) are transmitted in a single transmission in a downlink subframe, two bits are required for a single transmission. Whether to use one bit or two bits for feedback may be specified by the network device configuration or protocol.
  • the feedback of scheduling detection can be added, that is, there are three results of ACK, NACK, or no scheduling for each subframe.
  • the feedback of scheduling detection can be added, that is, there are three results of ACK, NACK, or no scheduling for each subframe.
  • the feedback result of each subframe is arranged in the order of the subframe.
  • the length of the feedback information is related to the length of the first time period. The longer the first time period, the more scheduling times and the greater the feedback information.
  • the terminal device feeds back the ACK/NACK status of all downlink HARQ processes.
  • the terminal device Since the downlink HARQ process in the system has a maximum value, for example, the LTE downlink supports 8 HARQ processes, the terminal device will feed back the ACK/NACK status of all 8 HARQ processes. In this way, the size of the feedback information does not change with the length of the first time period, and the efficiency is higher.
  • the terminal device stops performing HARQ level feedback to the first network device, and only performs radio link control (RLC) or packet data convergence protocol (PDCP) in the UL-Grant. ) Level of feedback.
  • RLC radio link control
  • PDCP packet data convergence protocol
  • the terminal device will feed back the RLC/PDCP status report in the UL-Grant after the first time period ends, and trigger the base station RLC/PDCP level retransmission.
  • the corresponding HARQ process will clear the HARQ process buffer regardless of whether the data is successfully received.
  • the corresponding HARQ result is NACK, it will feed back failure information to the upper layer.
  • the resources used to transmit the feedback message may be pre-configured by the first network device.
  • the first network device may simultaneously preconfigure the uplink resource UL-Grant for the terminal device after each time period in the time period set, so as to transmit the feedback message.
  • the time position may be indicated by the frame number+subframe number, or indicated by the subframe number alone.
  • the uplink resource may appear periodically, the period may be consistent with the first time period, or may be configured separately.
  • the uplink resource used to transmit the feedback message may be associated with the uplink resource used to transmit the first indication information, that is, when the terminal device instructs the first network device to use the first time period,
  • the uplink resources used to transmit the feedback message take effect.
  • the start time and end time of the first time period can be configured separately by the first network device, and the first time period and the two uplink resources before and after the first time period can also be configured jointly.
  • the first subframe after the uplink resource used for transmitting the first indication information is used as the start time of the first time period, or the previous subframe of the uplink resource used for transmitting the feedback message is used as the first time period The end of the moment.
  • the pre-configured UL-Grant can save the process of applying for resources and send feedback messages faster.
  • the resource for transmitting the feedback message may be requested by the terminal device from the first network device.
  • the terminal device applies to the first network device through the SR for uplink resources for transmitting the feedback message.
  • This method requires a certain time delay due to the application process, but it can improve resource utilization.
  • the feedback message may be a MAC CE message or an RRC message.
  • the uplink resource used to transmit the feedback message can also be used to send a goodbye message to the first network device, indicating that the connection with the first network device is released.
  • Fig. 11 is a sequence diagram of retransmission of an access message, and Fig. 11 takes msg3 as an example.
  • the terminal device Before sending msg3 to the second network device, the terminal device may send the first indication information to the first network device through an SR application or a pre-configured UL-Grant, indicating that the initial transmission of msg3 is to be performed subsequently.
  • the first indication information may indicate a specific time or a period of time (for example, start and end positions), indicating that the terminal device will send msg3 within the time or time range.
  • the first network device can then indicate the UL-Grant to the terminal device.
  • the UL-Grant period occurs.
  • the first network device may configure the valid number of times of the UL-Grant, for example, the number of transmissions is equal to the maximum number of retransmissions of msg3.
  • the effective number of times can also be stipulated by an agreement.
  • the terminal device can use the UL-Grant after the first time period to feed back the HARQ information in the first time period.
  • the UL-Grant can also be used to send to the first network device the random access status information of the terminal device in the second network device, such as successful access, failed access, successful msg3 transmission, msg3 transmission failure, and competition Successful solution, failed competition solution, etc.
  • FIG. 12 is an overall sequence diagram of information interaction between a terminal device and a first network device and a second network device in an embodiment of the present application.
  • corresponding pre-UL-Grant and post-UL-Grant can be designed, the pre-UL-Grant is used to send the first indication information, and the post-UL-Grant is used to send Feedback message or RLC/PDCP status report.
  • the terminal device When the terminal device needs to send data to the first network device, 840 may also be executed. Outside the first time period, the terminal device sends uplink data to the first network device according to the scheduling instruction of the first network device. That is to say, when the terminal device has uplink data to be sent to the first network device, it needs to send it at a time outside the first time period.
  • the configuration of the first time period, time period set, or UL-grant involved in the embodiment of the present application is all for the second network device. If there are multiple candidate network devices for handover, the above configuration can be performed for each network device or part of the network device.
  • the terminal device when the terminal device needs to switch from the first network device to the second network device, it indicates a period of time to the first network device, during which the terminal device sends an access message to the second network device, outside this time period, the terminal device can send uplink data to the first network device, that is, the terminal device is only sending access messages (for example, random access preamble, handover complete message, or reconfiguration) to the second network device.
  • the terminal device When the message is completed), the uplink data transmission with the first network device is interrupted.
  • the terminal device when the terminal device randomly accesses the second network device, the terminal device at other times outside this time period can also send uplink data to the first network device, so that the terminal device with double-receiving and single-transmitting can communicate with the source
  • the network device completes the random access process for the target network device while transmitting data.
  • FIG. 13 is a schematic structural diagram of a terminal device according to an embodiment of the present application.
  • the terminal device 1300 shown in FIG. 13 may correspond to the above terminal device.
  • the terminal device 1300 includes a receiving module 1310 and a sending module 1320.
  • the receiving module 1310 receives a handover message sent by the first network device, where the handover message is used to instruct the terminal device 1300 to switch from the first network device to the second network device, or to instruct at least one handover candidate network device, the at least one handover
  • the candidate network device includes the second network device.
  • the sending module 1320 sends first indication information to the first network device, where the first indication information is used to indicate a first time period; during the first time period, sends an access message to the second network device, and the connection The incoming message is used to access the second network device; outside the first time period, send uplink data to the first network device according to the scheduling instruction of the first network device.
  • the first indication information includes at least one of the duration and the end time of the first time period, and the start time.
  • the sending module 1320 is further configured to send second instruction information to the first network device before the terminal device 1300 sends the first instruction information to the first network device, where the second instruction information is used to indicate A time period set, the time period set includes multiple time periods, and the multiple time periods include the first time period; the first indication information is used to indicate the first time period in the time period set.
  • the second indication information is specifically used to indicate at least one of the duration and the end time of the second time period, as well as the start time and the period of the second time period, and multiple second time periods that occur periodically Constitute the multiple time periods.
  • the access message is a random access preamble, a handover complete message, or a reconfiguration complete message.
  • the time-frequency resource used for transmitting the first indication information is pre-configured, and the time-frequency resource used for transmitting the first indication information appears periodically.
  • the sending module 1320 is further configured to send a feedback message to the first network device after the first time period, where the feedback message is used to indicate that the first network device and the first network device communicate with each other within the first time period. Whether the downlink transmission between the terminal devices 1300 is successful.
  • the feedback message includes feedback information of each downlink transmission, or feedback information of each subframe, or feedback information of each HARQ process of hybrid automatic repeat request.
  • the time-frequency resource used for transmitting the feedback message is pre-configured, and the time-frequency resource used for transmitting the feedback message appears periodically.
  • the receiving module 1310 and the sending module 1320 can be implemented by a transceiver.
  • the specific functions and beneficial effects of the receiving module 1310 and the sending module 1320 can be referred to the method shown in FIG. 8, which will not be repeated here.
  • FIG. 14 is a schematic structural diagram of a network device according to an embodiment of the present application.
  • the network device 1400 shown in FIG. 14 may correspond to the first network device described above.
  • the network device 1400 includes a receiving module 1410 and a sending module 1420.
  • the sending module 1420 is configured to send a handover message to the terminal device, where the handover message is used to instruct the terminal device to switch from the network device 1400 to the second network device, or instruct at least one switch candidate network device, the at least one switch candidate network device Including the second network device.
  • the receiving module 1410 is configured to receive first indication information sent by the terminal device, where the first indication information is used to indicate a first time period, where the first time period is for the terminal device to send an access message to the second network device Time period, the access message is used to access the second network device, and the time period other than the first time period when the terminal device accesses the second network device is when the terminal device sends an uplink to the network device 1400 The period of the data.
  • the first indication information includes at least one of the duration and the end time of the first time period, and the start time.
  • the receiving module 1410 is further configured to receive second indication information sent by the terminal device before the network device 1400 receives the first indication information sent by the terminal device, where the second indication information is used to indicate a time period
  • the set of time periods includes multiple time periods, and the multiple time periods include the first time period; the first indication information is used to indicate the first time period in the time period set.
  • the second indication information is specifically used to indicate at least one of the duration and the end time of the second time period, as well as the start time and the period of the second time period, and multiple second time periods that occur periodically Constitute the multiple time periods.
  • the access message is a random access preamble, a handover complete message, or a reconfiguration complete message.
  • the time-frequency resource used for transmitting the first indication information is pre-configured, and the time-frequency resource used for transmitting the first indication information appears periodically.
  • the accepting module 1410 is further configured to receive a feedback message sent by the terminal device after the first time period, where the feedback message is used to indicate that the network device 1400 and the terminal device Whether the downlink transmission between the two is successful.
  • the feedback message includes feedback information of each downlink transmission, or feedback information of each subframe, or feedback information of each HARQ process of hybrid automatic repeat request.
  • the time-frequency resource used for transmitting the feedback message is pre-configured or scheduled by the network device 1400, and the time-frequency resource used for transmitting the feedback message appears periodically.
  • the receiving module 1410 and the sending module 1420 may be implemented by a transceiver.
  • the specific functions and beneficial effects of the receiving module 1410 and the sending module 1420 can be referred to the method shown in FIG. 8, which will not be repeated here.
  • FIG. 15 is a schematic structural diagram of a terminal device provided by another embodiment of the present application.
  • the terminal device 1500 shown in FIG. 15 may correspond to the above terminal device.
  • the terminal device 1500 includes a transceiver 1510, a processor 1520, and a memory 1530.
  • FIG. 15 Only one memory and processor are shown in FIG. 15. In actual terminal equipment products, there may be one or more processors and one or more memories.
  • the memory may also be referred to as a storage medium or storage device.
  • the memory may be set independently of the processor, or may be integrated with the processor, which is not limited in the embodiment of the present application.
  • the transceiver 1510, the processor 1520, and the memory 1530 communicate with each other through internal connection paths, and transfer control and/or data signals.
  • the transceiver 1510 is configured to receive a handover message sent by a first network device, where the handover message is used to instruct the terminal device 1300 to switch from the first network device to the second network device, or to instruct at least one switch candidate network device ,
  • the at least one handover candidate network device includes the second network device; sending first indication information to the first network device, where the first indication information is used to indicate a first time period; within the first time period, to the The second network device sends an access message, the access message is used to access the second network device; outside the first time period, the uplink data is sent to the first network device according to the scheduling instruction of the first network device.
  • FIG. 16 is a schematic structural diagram of a network device provided by another embodiment of the present application.
  • the network device 1600 shown in FIG. 16 may correspond to the above first network device.
  • the network device 1600 includes a transceiver 1610, a processor 1620, and a memory 1630.
  • the memory may also be referred to as a storage medium or storage device.
  • the memory may be set independently of the processor, or may be integrated with the processor, which is not limited in the embodiment of the present application.
  • the transceiver 1610, the processor 1620, and the memory 1630 communicate with each other through internal connection paths, and transfer control and/or data signals.
  • the transceiver 1610 is configured to send a handover message to a terminal device, where the handover message is used to instruct the terminal device to switch from the network device 1400 to the second network device, or to instruct at least one switch candidate network device, the at least one switch
  • the candidate network device includes the second network device; receiving first indication information sent by the terminal device, where the first indication information is used to indicate a first time period, where the first time period is sent by the terminal device to the second network device The time period of the access message, the access message is used to access the second network device, and the time period other than the first time period when the terminal device accesses the second network device The period during which the device 1400 sends uplink data.
  • the transceiver in each embodiment of the present application may also be referred to as a transceiver unit, transceiver, transceiver, and so on.
  • the processor may also be called a processing unit, a processing board, a processing module, a processing device, and so on.
  • the device for implementing the receiving function in the transceiver can be regarded as the receiving unit, and the device for implementing the sending function in the transceiver as the sending unit, that is, the transceiver includes the receiving unit and the sending unit.
  • the receiving unit may sometimes be called a receiver, receiver, or receiving circuit.
  • the transmitting unit may sometimes be called a transmitter, a transmitter, or a transmitting circuit.
  • the memory described in each embodiment of the present application is used to store computer instructions and parameters required for the operation of the processor.
  • the processor described in each embodiment of the present application may be an integrated circuit chip with signal processing capability. In the implementation process, the steps of the above method can be completed by hardware integrated logic circuits in the processor or instructions in the form of software.
  • the processor described in each embodiment of the present application may be a general-purpose processor, a digital signal processor (digital signal processor, DSP), an application specific integrated circuit (ASIC), and a field programmable gate array (field programmable gate array). , FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components.
  • DSP digital signal processor
  • ASIC application specific integrated circuit
  • FPGA field programmable gate array
  • the methods, steps, and logical block diagrams disclosed in the embodiments of the present application can be implemented or executed.
  • the general-purpose processor may be a microprocessor or the processor may also be any conventional processor or the like.
  • the steps of the method disclosed in the embodiments of the present application may be directly embodied as being executed and completed by a hardware decoding processor, or executed and completed by a combination of hardware and software modules in the decoding processor.
  • the software module can be located in random access memory (RAM), flash memory, read-only memory (read-only memory, ROM), programmable read-only memory, or electrically erasable programmable memory, registers, etc. mature in the field Storage medium.
  • the storage medium is located in the memory, and the processor reads the instructions in the memory and completes the steps of the above method in combination with its hardware.
  • the size of the sequence number of each process does not mean the order of execution.
  • the execution order of each process should be determined by its function and internal logic, and should not constitute the implementation process of the embodiments of this application. Any restrictions.
  • the computer program product includes one or more computer instructions.
  • the computer may be a general-purpose computer, a special-purpose computer, a computer network, or other programmable devices.
  • the computer instructions may be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another computer-readable storage medium. For example, the computer instructions may be transmitted from a website, computer, server, or data center.
  • the computer-readable storage medium may be any available medium that can be accessed by a computer or a data storage device such as a server or a data center integrated with one or more available media.
  • the usable medium may be a magnetic medium (for example, a floppy disk, a hard disk, and a magnetic tape), an optical medium (for example, a digital video disc (DVD)), or a semiconductor medium (for example, a solid state disk (SSD)), etc.
  • first and second in the first network device and the second network device in the embodiments of the present application are only used to distinguish different network devices, rather than limiting the functions of the network device itself.
  • a network device can be used as either the first network device or the second network device.
  • the disclosed system, device, and method may be implemented in other ways.
  • the device embodiments described above are only illustrative.
  • the division of the units is only a logical function division, and there may be other divisions in actual implementation, for example, multiple units or components can be combined or It can be integrated into another system, or some features can be ignored or not implemented.
  • the displayed or discussed mutual coupling or direct coupling or communication connection may be indirect coupling or communication connection through some interfaces, devices or units, and may be in electrical, mechanical or other forms.
  • the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the objectives of the solutions of the embodiments.
  • each unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units may be integrated into one unit.
  • the function is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer readable storage medium.
  • the technical solution of this application essentially or the part that contributes to the existing technology or the part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including Several instructions are used to make a computer device (which may be a personal computer, a server, or a network device, etc.) execute all or part of the steps of the method described in each embodiment of the present application.
  • the aforementioned storage media include: U disk, mobile hard disk, read-only memory (read-only memory, ROM), random access memory (random access memory, RAM), magnetic disk or optical disk and other media that can store program code .

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Abstract

本申请提供了切换网络设备的方法、终端设备和网络设备。本申请的技术方案中终端设备在需要从第一网络设备切换至第二网络设备时，向第一网络设备指示一个时间段，在该时间段内终端设备向第二网络设备发送接入消息，在该时间段之外终端设备向第一网络设备发送上行数据，也就是说，终端设备仅在向第二网络设备发送接入消息(例如，随机接入前导码、切换完成消息或重配置完成消息)时才中断与第一网络设备的上行数据传输。这样，在终端设备随机接入第二网络设备的过程中，该时间段之外的其他时间终端设备同样可以向第一网络设备发送上行数据，从而使得具有双收单发的终端设备在与源网络设备进行数据传输的同时完成针对目标网络设备的随机接入过程。

Description

切换网络设备的方法、终端设备和网络设备 技术领域
本申请涉及通信领域，并且更具体地涉及切换网络设备的方法、终端设备和网络设备。
背景技术
蜂窝通信系统(例如，长期演进(long term evolution，LTE)系统)中，当终端设备移动时，终端设备根据信号强度的变化或者网络设备侧的负载均衡的需求，可以发生服务网络设备的切换。在传统切换方式中，当终端设备收到切换命令时，终端设备会断开与源网络设备的无线资源控制(radio resource control，RRC)连接，随后开始进行针对目标网络设备的随机接入过程，在向目标网络设备发送切换完成消息后，终端设备恢复RRC连接。在这一切换过程中，如图1所示，终端设备与源网络设备的数据传输是中断的，其中第一网络设备对应于源网络设备，第二网络设备对应于目标网络设备。
为减少终端设备在切换过程中的数据传输中断时间，提出了先接后断(make-before-break，MBB)的连接维持方法。其主要改进为：当终端设备收到切换命令后，并不立即中断与源网络设备的连接，而是继续维持到终端设备针对目标网络设备的首次上行传输时刻。例如，在终端设备收到切换命令后，仍然维持了与源网络设备的通信，直到终端设备向目标网络设备发送随机接入前导码时才中断。这样终端设备与目标网络设备的随机接入过程中，数据传输才是中断的状态，这样减少了数据中断的时间。
进一步地，提出了增强的MBB(enhanced make-before-break，eMBB)方案(或称为同时连接切换方案)，即终端设备同时与源网络设备和目标网络设备连接的方案。与MBB方案相比，如图2所示，即使在终端设备与目标网络设备的随机接入过程中，终端设备与源网络设备的连接也不中断(图2中点划线所示)。
对于具有双发双收能力的终端设备来说，针对源网络设备的数据收发和针对目标网络设备的数据收发可以独立进行，互不影响，所以不需要额外的流程设计。但是对于具有双收单发的终端设备来说，能够同时接收两个网络设备发送的下行数据，但是在任意时刻只能向一个网络设备发送上行数据。
因此，对于具有双收单发的终端设备，如何在与源网络设备进行数据传输的同时完成针对目标网络设备的随机接入过程成为亟需解决的问题。
发明内容
本申请提供切换网络设备的方法、终端设备和网络设备，能够使得具有双收单发的终端设备在与源网络设备进行数据传输的同时完成针对目标网络设备的随机接入过程。
第一方面，本申请提供了一种切换网络设备的方法，该方法包括：终端设备接收第一网络设备发送的切换消息，该切换消息用于指示该终端设备从该第一网络设备切换至第二网络设备，或者指示至少一个切换候选网络设备，该至少一个切换候选网络设备包括该第 二网络设备；该终端设备向该第一网络设备发送第一指示信息，该第一指示信息用于指示第一时间段；在该第一时间段内，该终端设备向该第二网络设备发送接入消息，该接入消息用于接入该第二网络设备；在该第一时间段外，该终端设备根据该第一网络设备的调度指示向该第一网络设备发送上行数据。
在上述技术方案中，终端设备在需要从第一网络设备切换至第二网络设备时，向第一网络设备指示一个时间段，在该时间段内终端设备向第二网络设备发送接入消息，在该时间段之外终端设备可以向第一网络设备发送上行数据，也就是说，终端设备仅在向第二网络设备发送接入消息(例如，随机接入前导码、切换完成消息或重配置完成消息)时才中断与第一网络设备的上行数据传输。这样，在终端设备随机接入第二网络设备的过程中，该时间段之外的其他时间终端设备同样可以向第一网络设备发送上行数据，从而使得具有双收单发的终端设备在与源网络设备进行数据传输的同时完成针对目标网络设备的随机接入过程。
此外，由终端设备指示向第二网络设备发送接入消息的第一时间段。这样，可以仅在终端设备确定要切换到第二网络设备时，终端设备才向第一网络设备申请或指示一段时间，以便向第二网络设备发送接入消息，从而减小资源占用。
在一种可能的实现方式中，该第一指示信息包括该第一时间段的时长和结束时刻中的至少一个，以及起始时刻。
在上述技术方案中，由终端设备确定第一时间段并通过第一指示信息指示给第一网络设备，也就是说，第一时间段不是由第一网络设备调度或者预配置的，这样可以减少终端设备与第一网络设备的信令交互。
在一种可能的实现方式中，在该终端设备向该第一网络设备发送第一指示信息之前，该方法还包括：该终端设备向该第一网络设备发送第二指示信息，该第二指示信息用于指示时间段集合，该时间段集合包括多个时间段，该多个时间段包括该第一时间段；该第一指示信息用于指示该时间段集合中的该第一时间段。
对于第二网络设备为终端设备配置有专用的随机接入资源时，终端设备可以在指示用于发送接入消息的第一时间段之前，向第一网络设备指示自己有可能用于发送接入消息的时间段集合，以便网络设备为终端设备预配置多个时间段，这样第一网络设备可以更好地配置该多个时间段。
在一种可能的实现方式中，该第二指示信息具体用于指示第二时间段的时长和结束时刻中的至少一个，以及起始时刻和该第二时间段的周期，周期出现的多个该第二时间段构成该多个时间段。
在上述技术方案中，网络设备可以通过终端设备指示一个时间段和该时间段出现的周期，为终端设备配置多个时间段，例如，第二网络设备为终端设备分配的随机接入资源为子帧2，那么终端设备可以向第一网络设备指示包含子帧2的一个时间段，并指示周期为每个系统帧，那么第一网络设备在每个系统帧为终端设备配置一个包含子帧2的时间段。上述技术方案易于实现。
在一种可能的实现方式中，该接入消息为随机接入前导码、切换完成消息或重配置完成消息。
在一种可能的实现方式中，用于传输该第一指示信息的时频资源是预配置，该用于传 输该第一指示信息的时频资源周期出现。
在上述技术方案中，网络设备为终端设备预配置传输第一指示信息的资源，例如配置一个UL-grant，这样，终端设备可以更快的发送第一指示信息。
在一种可能的实现方式中，该方法还包括：在该第一时间段之后，该终端设备向该第一网络设备发送反馈消息，该反馈消息用于指示在该第一时间段内该第一网络设备与该终端设备之间的下行传输是否成功。
考虑到在第一时间段内第一网络设备有可能向终端设备发送下行数据，而终端设备在第一时间段内又不能向第一网络设备发送上行数据，这样就会造成在第一时间段内，针对下行数据的ACK或NACK并未反馈给第一网络设备。上述技术方案在第一时间段后，终端设备通过一条反馈消息，反馈第一时间段内的ACK或NACK。这样，可以提高第一网络设备与终端设备之间数据传输的可靠性。
在一种可能的实现方式中，该反馈消息包括每次下行传输的反馈信息，或者每个子帧的反馈信息，或者每个混合自动重传请求HARQ进程的反馈信息。
在一种可能的实现方式中，该用于传输该反馈消息的时频资源是预配置，该用于传输该反馈消息的时频资源周期出现。
在上述技术方案中，网络设备为终端设备预配置传输反馈消息的资源，例如配置一个UL-grant，这样，终端设备可以更快的发送反馈消息。
第二方面，本申请提供一种切换网络设备的方法，该方法包括：第一网络设备向终端设备发送切换消息，该切换消息用于指示该终端设备从该第一网络设备切换至第二网络设备，或者指示至少一个切换候选网络设备，该至少一个切换候选网络设备包括该第二网络设备；该第一网络设备接收该终端设备发送的第一指示信息，该第一指示信息用于指示第一时间段，该第一时间段是该终端设备向该第二网络设备发送接入消息的时段，该接入消息用于接入该第二网络设备，在该终端设备接入该第二网络设备的过程中除该第一时间段之外的时段是该终端设备向该第一网络设备发送上行数据的时段。
在上述技术方案中，终端设备在需要从第一网络设备切换至第二网络设备时，向第一网络设备指示一个时间段，在该时间段内终端设备向第二网络设备发送接入消息，在该时间段之外终端设备向第一网络设备发送上行数据，也就是说，终端设备仅在向第二网络设备发送接入消息(例如，随机接入前导码、切换完成消息或重配置完成消息)时才中断与第一网络设备的上行数据传输。这样，在终端设备随机接入第二网络设备的过程中，该时间段之外的其他时间终端设备同样可以向第一网络设备发送上行数据，从而使得具有双收单发的终端设备在与源网络设备进行数据传输的同时完成针对目标网络设备的随机接入过程。
此外，由终端设备指示向第二网络设备发送接入消息的第一时间段。这样，可以仅在终端设备确定要切换网络设备时，终端设备才向第一网络设备申请或指示一段时间，以便向第二网络设备发送接入消息，从而减小资源占用。
在一种可能的实现方式中，该第一指示信息包括该第一时间段的时长和结束时刻中的至少一个，以及起始时刻。
在上述技术方案中，由终端设备确定第一时间段并通过第一指示信息指示给第一网络设备，也就是说，第一时间段不是由第一网络设备调度或者预配置的，这样可以减少终端 设备与第一网络设备的信令交互。
在一种可能的实现方式中，在该第一网络设备接收该终端设备发送的第一指示信息之前，该方法还包括：该第一网络设备接收该终端设备发送的第二指示信息，该第二指示信息用于指示时间段集合，该时间段集合包括多个时间段，该多个时间段包括该第一时间段；该第一指示信息用于指示该时间段集合中的该第一时间段。
对于第二网络设备为终端设备配置有专用的随机接入资源时，终端设备可以在指示用于发送接入消息的第一时间段之前，向第一网络设备指示自己有可能用于发送接入消息的时间段集合，以便网络设备为终端设备预配置多个时间段，这样第一网络设备可以更好地配置该多个时间段。
在一种可能的实现方式中，该第二指示信息具体用于指示第二时间段的时长和结束时刻中的至少一个，以及起始时刻和该第二时间段的周期，周期出现的多个该第二时间段构成该多个时间段。
在上述技术方案中，网络设备可以通过终端设备指示一个时间段和该时间段出现的周期，为终端设备配置多个时间段，例如，第二网络设备为终端设备分配的随机接入资源为子帧2，那么终端设备可以向第一网络设备指示包含子帧2的一个时间段，并指示周期为每个系统帧，那么第一网络设备在每个系统帧为终端设备配置一个包含子帧2的时间段。上述技术方案易于实现。
在一种可能的实现方式中，在该第一网络设备接收该终端设备发送的第一指示信息之前，该方法还包括：该第一网络设备根据该第二网络设备为该终端设备分配的随机接入资源，为该终端设备配置时间段集合，该时间段集合包括多个时间段，该多个时间段包括该第一时间段；该第一指示信息用于指示该时间段集合中的该第一时间段。
例如，第二网络设备向第一网络设备发送切换确认消息，其中指示分配给终端设备的专用的随机接入资源为子帧2，第一网络设备获取到该配置信息后，那么第一网络设备可以在每个系统帧为终端设备配置一个包含子帧2的时间段。
在一种可能的实现方式中，该接入消息为随机接入前导码、切换完成消息或重配置完成消息。
在一种可能的实现方式中，用于传输该第一指示信息的时频资源是预配置，该用于传输该第一指示信息的时频资源周期出现。
在上述技术方案中，网络设备为终端设备预配置传输第一指示信息的资源，例如配置一个UL-grant，这样，终端设备可以更快的发送第一指示信息。
在一种可能的实现方式中，该方法还包括：在该第一时间段之后，该第一网络设备接收该终端设备发送的反馈消息，该反馈消息用于指示在该第一时间段内该第一网络设备与该终端设备之间的下行传输是否成功。
考虑到在第一时间段内第一网络设备有可能向终端设备发送下行数据，而终端设备在第一时间段内又不能向第一网络设备发送上行数据，这样就会造成在第一时间段内，针对下行数据的ACK或NACK并未反馈给第一网络设备。上述技术方案在第一时间段后，终端设备紧接着通过一条反馈消息，反馈第一时间段内的ACK或NACK。这样，可以提高第一网络设备与终端设备之间数据传输的可靠性。
在一种可能的实现方式中，该反馈消息包括每次下行传输的反馈信息，或者每个子帧 的反馈信息，或者每个混合自动重传请求HARQ进程的反馈信息。
在一种可能的实现方式中，该用于传输该反馈消息的时频资源是预配置或者由该第一网络设备调度的，该用于传输该反馈消息的时频资源周期出现。
在上述技术方案中，网络设备为终端设备预配置传输反馈消息的资源，例如配置一个UL-grant，这样，终端设备可以更快的发送反馈消息。
第三方面，本申请提供了一种终端设备，包括用于执行第一方面或第一方面任意一种实现方式中的模块。
第四方面，本申请提供了一种网络设备，包括用于执行第二方面或第二方面任意一种实现方式中的模块。
第五方面，本申请提供了一种芯片，包括收发器、处理器和存储器，用于执行第一方面或第一方面任意一种实现方式所述的方法。
第六方面，本申请提供了一种芯片，包括收发器、处理器和存储器，用于执行第二方面或第二方面任意一种实现方式所述的方法。
第七方面，本申请提供了一种终端设备，包括收发器、处理器和存储器，用于执行第一方面或第一方面任意一种实现方式所述的方法。
第八方面，本申请提供了一种网络设备，包括收发器、处理器和存储器，用于执行第二方面或第二方面任意一种实现方式所述的方法。
第九方面，本申请提供了一种计算机可读存储介质，包括指令，当其在终端设备上运行时，使得终端设备执行第一方面或第一方面任意一种实现方式所述的方法。
第十方面，本申请提供了一种计算机可读存储介质，包括指令，当其在网络设备上运行时，使得网络设备执行第二方面或第二方面任意一种实现方式所述的方法。
第十一方面，本申请提供了一种计算机程序产品，当其在终端设备上运行时，使得终端设备执行第一方面或第一方面任意一种实现方式所述的方法。
第十二方面，本申请提供了一种计算机程序产品，当其在网络设备上运行时，使得网络设备执行第二方面或第二方面任意一种实现方式所述的方法。
附图说明
图1是网络设备切换流程的示意图。
图2是eMBB切换流程的示意图。
图3是可以应用本申请实施例的技术方案的系统架构图。
图4是可以应用本申请实施例的技术方案的另一系统架构图。
图5是可应用本申请实施例的技术方案的另一系统架构图。
图6是随机接入前导码资源示意图。
图7是随机接入时序图。
图8是本申请实施例的切换网络设备的方法的示意性流程图。
图9是本申请另一实施例的切换网络设备的方法的示意性流程图。
图10是本申请另一实施例的切换网络设备的方法的示意性流程图。
图11是接入消息msg3重传的时序图。
图12是本申请实施例的终端设备与第一网络设备和第二网络设备信息交互的整体时 序图。
图13是本申请实施例的终端设备的示意性结构图。
图14是本申请实施例的网络设备的示意性结构图。
图15是本申请另一实施例提供的终端设备的示意性结构图。
图16是本申请另一实施例提供的网络设备的示意性结构图。
具体实施方式
下面将结合附图，对本申请中的技术方案进行描述。
本申请实施例的技术方案可以应用于各种通信系统，例如：全球移动通信(global system for mobile communications，GSM)系统、码分多址(code division multiple access，CDMA)系统、宽带码分多址(wideband code division multiple access，WCDMA)系统、通用分组无线业务(general packet radio service，GPRS)、长期演进(long term evolution，LTE)系统、LTE频分双工(frequency division duplex，FDD)系统、LTE时分双工(time division duplex，TDD)、通用移动通信系统(universal mobile telecommunication system，UMTS)、全球互联微波接入(worldwide interoperability for microwave access，WiMAX)通信系统、未来的第五代(5th generation，5G)系统或新无线(new radio，NR)等。
本申请实施例中的终端设备可以指用户设备、接入终端、用户单元、用户站、移动站、移动台、远方站、远程终端、移动设备、用户终端、终端、无线通信设备、用户代理或用户装置。终端设备还可以是蜂窝电话、无绳电话、会话启动协议(session initiation protocol，SIP)电话、无线本地环路(wireless local loop，WLL)站、个人数字助理(personal digital assistant，PDA)、具有无线通信功能的手持设备、计算设备或连接到无线调制解调器的其它处理设备、车载设备、可穿戴设备，未来5G网络中的终端设备或者未来演进的公用陆地移动通信网络(public land mobile network，PLMN)中的终端设备等，本申请实施例对此并不限定。可选地，终端设备可以接收网络设备发送的切换命令，切换过程中保持与源基站的数据传输。
本申请实施例中的网络设备可以是用于与终端设备通信的设备，该网络设备可以是全球移动通信(global system for mobile communications，GSM)系统或码分多址(code division multiple access，CDMA)中的基站(base transceiver station，BTS)，也可以是宽带码分多址(wideband code division multiple access，WCDMA)系统中的基站(NodeB，NB)，还可以是LTE系统中的演进型基站(evolved NodeB，eNB或eNodeB)，也可以是集中式单元(centralized unit，CU)、分布式单元(distributed unit，DU)，还可以是云无线接入网络(cloud radio access network，CRAN)场景下的无线控制器，或者该网络设备可以为中继站、接入点、车载设备、可穿戴设备以及未来5G网络中的网络设备或者未来演进的PLMN网络中的网络设备等，本申请实施例并不限定。可选地，本申请实施例的网络设备可以为终端设备配置传输资源，并可以进行网络设备间的协作。
图3是可以应用本申请实施例的技术方案的系统架构图。对于LTE通信系统，每个eNB下可以存在多个小区，在每个小区中的UE及其所属的eNB都可以本申请实施例的技术方案。
图4是可以应用本申请实施例的技术方案的另一系统架构图。对于5G或NR系统， 在一个gNB下，可能存在一个或多个发射及接收点(transmission and reception point，TRP)，每个gNB或TRP及其服务的终端设备都可以应用本申请实施例的技术方案。
图5是可应用本申请实施例的技术方案的另一系统架构图。对于集中式单元(centralized unit，CU)-分布式单元(distributed unit，DU)分离场景，在一个CU下，可以存在多个DU。CU-DU分离场景和多TRP场景的区别在于，TRP只是一个射频单元或一个天线设备，而DU中可以实现协议栈功能，例如DU中可以实现无线链路控制(radio link control，RLC)层和物理层功能。
为了方便理解本申请实施例的技术方案，首先对本申请涉及到的概念及相关技术进行描述。
结合图2对切换网络设备的流程进行描述。图2中第一网络设备对应于源网络设备，第二网络设备对应于目标网络设备，具体切换流程如下。
在切换网络设备之前，终端设备与源网络设备执行101和102；源网络设备根据终端设备发送的测量报告执行103；当源网络设备判断终端设备需要进行网络设备的切换时，执行104，向目标网络设备发送切换请求；目标网络设备执行105，根据自身的情况进行准入控制，当第二网络设判断允许终端设备接入时，执行106，向源网络设备发送切换确认消息；源网络设备在收到目标网络设备发送的切换确认消息之后，执行107，向终端设备发送切换命令。
随后终端设备开始随机接入目标网络设备。终端设备执行108，向目标网络设备发送随机接入前导码(也称msg1))；目标网络设备在成功检测到前导码后，执行109，向终端设备发送随机接入响应消息(也称msg2)；终端设备收到随机接入响应消息后，执行110，向目标网络设备发送重配置完成消息(也称msg3)。如果源网络设备发送的切换命令包含了专用的前导码资源，在终端设备成功向目标网络设备发送msg3后或成功接收到msg2后，随机接入过程即完成，执行111，终端设备与目标网络设备之间传输用户数据。如果源网络设备发送的切换命令中不包含专用的随机接入资源，即终端设备是通过竞争模式发起随机接入过程，最后还需要执行113，目标网络设备向终端设备发送竞争解决消息(也称msg4)，在终端设备成功接收到正确的竞争解决消息后，随机接入过程才完成，执行111。在终端设备与目标网络设备完成通信，目标网络设备执行112，释放用户。
由图2可以看出，在终端设备收到切换命令后，仍然维持与源网络设备的通信，即终端设备同时与源网络设备和目标网络设备连接。也就是说，即使在终端设备与目标网络设备的随机接入过程中，终端设备与源网络设备的连接也不中断。
上述过程，对于一个具有双发双收能力的终端设备来说，针对源网络设备的数据收发和针对目标网络设备的数据收发可以独立进行，互不影响，所以不需要额外的流程设计。但是对于一个具有双收单发的终端设备来说，能够同时接收两个网络设备发送的下行数据，但是在任意时刻只能向一个网络设备发送上行数据，而且考虑到射频通道切换和两个网络设备不同的同步时间点，可能无法做到瞬时切换，所以还需要考虑上行发射的转换时间。对于这样的终端设备，在eMBB切换过程中终端设备在随机接入目标网络设备的过程中，需要考虑如何进行上行发送能力在两个网络设备的分配。
对于msg1的资源配置包括小区公共配置和终端设备级别配置。对于公共配置，最重要是配置索引值。如图6所示，以LTE系统索引值10为例，它代表了当前的msg1格式 为0，在任何帧上的子帧2、5、8都有msg1资源可用。可以看出，msg1资源是周期出现的。
图7是随机接入时序图。如图7所示，帧号分别为N，N+1和N+2。终端设备在帧N的子帧5发送msg1，在msg2的接收时间窗内接收到msg2，具体是在帧N+1的子帧4，随后在4个子帧后，即帧N+1的子帧8，UE发送msg3，对于竞争随机接入过程，UE后续会收到msg4。
本申请在图7基础上，对终端设备的上行能力进一步按时间划分。在一段时间范围内，终端设备的上行能力只用于向目标网络设备发送，而在该时间范围外，终端设备的上行能力用于向源网络设备发送。这样，能够使得具有双收单发的终端设备在与源网络设备进行数据传输的同时完成针对目标网络设备的随机接入过程。
图8是本申请实施例的切换网络设备的方法的示意性流程图。图8所示的方法包括以下内容的至少部分内容，其中第一网络设备可以是源网络设备，第二网络设备可以是目标网络设备。
在810中，终端设备接收第一网络设备发送的切换消息，该切换消息用于指示该终端设备从该第一网络设备切换至第二网络设备，或者指示至少一个切换候选网络设备，该至少一个切换候选网络设备包括该第二网络设备。
切换消息可以对应于上文的切换命令。
可选地，切换消息可以指示终端设备切换至第二网络设备。例如，切换消息中仅指示第二网络设备，终端设备在接收到切换消息后，向第二网络设备发起随机接入过程。
可选地，切换消息可以指示至少一个切换候选网络设备，在此情况下，终端设备在接收到切换消息后，可以不立即切换网络设备，等到确实需要切换网络设备时，从该至少一个切换候选网络设备中确定第二网络设备，进而向第二网络设备发起随机接入过程。也就是说，切换消息可以仅为终端设备提供切换候选的网络设备。
应理解，切换候选网络设备即为终端设备可以切换到的网络设备。
可选地，切换消息中可以包括第二网络设备分配给终端设备的专用随机接入资源，也就是说，即该资源只给当前终端设备使用，此时为非竞争随机接入；如果切换消息中不包括第二网络设备分配给终端设备的专用的随机接入资源，即随机接入资源可能由多个终端设备共享，此时为竞争随机接入。
应理解，对于非竞争随机接入，当终端设备成功接收到msg2后，即可认为终端设备从第一网络设备切换至第二网络设备，此后，终端设备不会再向第一网络设备发送上行数据，因此只需要考虑发送msg1的时间段；而对于竞争随机接入，需终端设备接收到msg4后，才可认为终端设备从第一网络设备切换至第二网络设备，因此，还需要考虑发送msg3的时间段，即需要考虑发送msg1和msg3的时间段。
在820中，该终端设备向该第一网络设备发送第一指示信息，该第一指示信息用于指示第一时间段。
在一些实施例中，第一指示信息用于指示第一时间段的具体配置信息。也就是说，终端设备确定第一时间段，并指示给第一网络设备。
也就是说，在这种情况下第一网络设备不会为终端设备预配置第一时间段来向第二网络设备发送接入消息，而是由终端设备根据选择的资源确定第一时间段，并指示给第一网 络设备。可选的，第一网络设备再为终端设备配置相应的时间段或第一网络设备只需确认接收到该指示信息。
应理解，上述技术方案可以应用于第二网络设备没有为终端设备配置专用的随机接入资源的场景，在这种场景中第一网络设备无法获知终端设备的专用随机接入资源，无法提前配置第一时间段。
可选地，第一指示信息指示第一时间段的起始时刻和结束时刻，或者指示第一时间段的起始时刻和时长。例如，第一指示信息指示起始子帧为子帧1，时长为3个子帧，即第一时间段为子帧1至子帧3。又例如，第一指示信息指示起始子帧为子帧1，结束子帧为子帧9，即第一时间段为子帧1至子帧9。
在向第一网络设备发送第一指示信息之前，终端设备根据选择的用于传输接入消息的资源，确定第一时间段。第一时间段内应包括终端设备选择的资源。
例如，终端设备选择的资源为子帧2，进而可以确定第一时间段为子帧2，或者子帧1至子帧3，或者子帧1至子帧2等。
又例如，终端设备选择的资源为子帧2、5、8，进而可以确定第一时间段为子帧1至子帧9等。
可选地，第一指示信息也可以直接指示终端设备选择的资源位置(例如，帧号+子帧号等)，进而由第一网络设备确定第一时间段。
例如，第一指示信息指示子帧2，那么第一网络设备在接收到第一指示信息后，为终端设备配置一个包括子帧2在内的第一时间段。
在另一些实施例中，第一指示信息也可以用于指示时间段集合中第一时间段，该时间段集合中的任意一个时间段均可用于向第二网络设备发送接入消息。作为一个示例，第一网络设备为终端设备预配置一个时间段集合，第一指示信息用于指示该时间段集合中终端设备将要使用的第一时间段。例如，第一时间段是第一网络设备接收到第一指示信息后的该时间段集合中的某个时间段，例如首个时间段。
在这种情况下，如图9所示，在820之前还可以执行910，第一网络设备可以根据终端设备发送的第二指示信息，为终端设备预配置时间段集合。
可选地，第二指示信息可以包括第二时间段的时长和结束时刻中的至少一个，以及起始时刻和所述第二时间段的周期，周期出现的多个所述第二时间段构成所述多个时间段。也就是说，终端设备向第一网络设备指示第二时间段和第二时间段出现的周期。
具体地，对于第二时间段的描述，可以采用起始位置+时长的方式，例如，起始子帧为子帧3，时长为3个子帧；或者也可以通过起始位置+结束位置的方式，例如，起始位置为子帧3，结束位置为子帧6。对于第二时间段的周期，终端设备和第二网络设备可以明示、隐示或者不指示的方式指示第二时间段的周期。例如，可以默认第二时间段的周期等同于随机接入资源出现的周期。又例如，如果第二时间段的描述中，只有子帧号而没有包含帧号，则表明第二时间段在每个帧中都出现或周期同随机接入资源出现的周期。又例如，如果第二时间段的描述中包含了帧号，则表明可以选择任意帧设置第二时间段的起始位置和结束位置，同时可以为第二时间段指定不同于随机接入资源出现的周期的周期。
可选地，每个第二时间段内都包括至少一个可用于向第二网络设备发送接入消息的子帧。例如，第二时间段包括可用于向第二网络设备发送接入消息的子帧2，或者第二时间 段包括可用于向第二网络设备发送接入消息的子帧2、5、8。
可选地，第二指示信息可以指示时间段集合中各时间段的时长以及时间间隔。
例如，当时间段集合中包括子帧2、子帧5、子帧8时，第二指示信息可以指示各时间段的时长为1个子帧，时间间隔分别为3子帧(子帧2与子帧5之间)、3子帧(子帧5与子帧8之间)、4子帧(子帧8与下一个帧中的子帧2之间)，依次类推。
应理解，时间段集合中各时间段之间的时间间隔也可以是周期出现的。
在另一种实施例中，第一网络设备也可以根据第二网络设备为该终端设备分配的随机接入资源，为终端设备配置时间段集合。
例如，通过第二网络设备向第一网络设备发送的切换确认消息指示分配给终端设备的专用的随机接入资源为子帧2，第一网络设备获得该配置信息后，那么第一网络设备可以在每个系统帧为终端设备配置一个包含子帧2的时间段。该配置可以包含在切换命令中，也可以作为单独的RRC消息发送给终端设备。
在一些实施例中，传输第一指示信息的资源可以是由第一网络设备预配置的。
例如，在第一网络设备预配置时间段集合的情况下，第一网络设备可以同时在时间段集合中各时间段之前为终端设备预配置上行资源UL-Grant，以便传输第一指示信息。
可选地，对于预配置用于传输第一指示信息的上行资源，时间位置可以通过帧号+子帧号指示，或单独通过子帧号指示。该上行资源可以是周期出现的，周期可以与第一时间段一致，也可以单独配置。
虽然这种方式资源利用率较低，但是通过预配置的UL-Grant，可以省去申请资源的过程，能够更快的发送第一指示信息。
在另一些实施例中，传输第一指示信息的资源可以是终端设备向第一网络设备申请的。
例如，终端设备通过调度请求(schedule request，SR)向第一网络设备申请用于传输第一指示信息的上行资源。这种方式由于需要经历申请过程，所以会存在一定时延，但可以提高资源利用率。
可选地，第一指示信息可以是媒体接入控制层控制元素(media access controls control element，MAC CE)消息或RRC消息。
可选的，终端设备发送完第一指示信息之后，无需等待第一网络设备的反馈消息，直接开始在相应位置发送msg1。
在830中，在该第一时间段内，该终端设备向该第二网络设备发送接入消息，该接入消息用于接入该第二网络设备。
可选地，接入消息可以是随机接入前导码、切换完成消息或重配置完成消息。也就是说，随机接入前导码、切换完成消息或重配置完成消息等的发送均可以采用本申请实施例的技术方法。
在第一时间段内，终端设备仍然能接收第一网络设备的下行数据，包括下行数据的新传和重传。因此，如图10所示在830之后还可以执行1010，如果第一时间段的起始和结束时刻是确定的，那么，终端设备在收到下行数据并确定每个子帧的下行数据的确认(acknowledgement，ACK)或否认(negative acknowledgement，NACK)后，在第一时间段之后就可以针对第一时间段的下行数据的进行统一反馈。
在一些实施例中，终端设备可以针对第一时间段内的每次下行传输的反馈信息，或者每个子帧的反馈信息，或者每个混合自动重传请求(hybrid automatic repeat request，HARQ)进程的反馈信息。
对于终端设备针对每次下行传输进行反馈的情况，反馈信息可以采用1比特(bit)表示ACK/NACK状态(例如1表示ACK，0表示NACK)。
例如，第一时间段的起始时刻是子帧2，长度是5个子帧，即第一时间段的终止时刻是子帧6，在这5个子帧中，第一网络设备在子帧3和4发送了下行数据，其他子帧没有发送数据，而且检测结果都是ACK。这样终端设备反馈两个比特，且两个比特均为1。如果在下行子帧中，单次传输两个传输块(transport block，TB)，则针对单次传输需要两个比特。具体是用一个比特还是两个比特反馈，可以是由网络设备配置或协议规定。
对于终端设备针对每个子帧进行反馈的情况，可以增加调度检测的反馈，即对每个子帧有ACK、NACK或无调度三种结果。对于每个子帧每次传输1个传输块的情况，需要2个比特进行反馈；如果支持两传输块在一个子帧传输，需要4个比特。
可选地，每个子帧的反馈结果按照子帧顺序排列。
可以理解地，以上两种方法中，反馈信息的长度与第一时间段的长度有关，第一时间段越长，调度次数越多，反馈信息也就越大。
对于终端设备针对每个HARQ进程进行反馈的情况，终端设备反馈所有下行HARQ进程的ACK/NACK状态。
由于系统中的下行HARQ进程有最大值，例如LTE下行支持8个HARQ进程，终端设备将反馈所有8个HARQ进程的ACK/NACK状态。这样，反馈信息的大小不随第一时间段的长度变化而变化，效率更高。
在另一些实施例中，终端设备停止向第一网络设备进行HARQ级别反馈，只在UL-Grant中进行无线链路控制(radio link control，RLC)或分组数据汇聚协议(packet data convergence protocol，PDCP)级别的反馈。这种方式中，终端设备会在第一时间段结束后的UL-Grant中，反馈RLC/PDCP的状态报告，触发基站RLC/PDCP级别的重传。可选的，被第一时间段覆盖的下行传输或上行反馈，其相应的HARQ进程无论是否接收数据成功，都将清空HARQ进程的缓冲区(buffer)。同时，如果相应的HARQ结果是NACK，则会向上层反馈失败信息。
在一些实施例中，用于传输反馈消息的资源可以是由第一网络设备预配置的。
例如，在第一网络设备预配置时间段集合的情况下，第一网络设备可以同时在时间段集合中各时间段之后为终端设备预配置上行资源UL-Grant，以便传输反馈消息。
可选地，对于预配置用于传输第一指示信息的上行资源，时间位置可以通过帧号+子帧号指示，或单独通过子帧号指示。该上行资源可以是周期出现的，周期可以与第一时间段一致，也可以单独配置。
可选地，用于传输反馈消息的上行资源可以与用于传输第一指示信息的上行资源相关联，即当终端设备向第一网络设备指示使用第一时间段时，第一时间段之后的用于传输反馈消息的上行资源才生效。
由于在用于传输反馈消息的上行资源中需要反馈HARQ状态，所以需要明确第一时间段的具体起始时刻和结束时刻。因此，第一时间段起始时刻和结束时刻除了可以由第一 网络设备单独配置，也可以将第一时间段和第一时间段前后两个上行资源可以联合配置。例如，采用用于传输第一指示信息的上行资源后的第一个子帧作为第一时间段的起始时刻，或者采用用于传输反馈消息的上行资源的前一个子帧作为第一时间段的结束时刻。
虽然这种方式资源利用率较低，但是通过预配置的UL-Grant，可以省去申请资源的过程，能够更快的发送反馈消息。
在另一些实施例中，用于传输反馈消息的资源可以是终端设备向第一网络设备申请的。
例如，终端设备通过SR向第一网络设备申请用于传输反馈消息的上行资源。这种方式由于需要经历申请过程，所以会存在一定时延，但可以提高资源利用率。
可选地，反馈消息可以是MAC CE消息或RRC消息。
此外，当接入消息为msg3时，用于传输反馈消息的上行资源还可以用于向第一网络设备发送再见消息，表示释放与第一网络设备的连接。
终端设备向第二网络设备发送接入消息时，接入消息可能经历多次重传。图11是接入消息重传的时序图，图11以msg3为例。
终端设备可以在向第二网络设备发送msg3前，通过SR申请或预配置UL-Grant向第一网络设备发送第一指示信息，表明随后要进行msg3初传。第一指示信息中可以指示一个具体的时刻或一段时间长度(例如起始和结束位置)，表明在该时刻或时间范围内，终端设备会发送msg3。随后第一网络设备可以向终端设备指示UL-Grant。可选地，该UL-Grant周期出现。可选的，第一网络设备可以配置该UL-Grant的有效次数，例如，传输次数等于msg3的最大重传次数。可选地，该有效次数也可以由协议规定。
由于终端设备在向第二网络设备发送msg3的时间段内，无法向第一网络设备反馈HARQ信息，所以终端设备可以使用第一时间段后的UL-Grant反馈第一时间段内的HARQ信息。
可选的，该UL-Grant还可以用于向第一网络设备发送终端设备在第二网络设备的随机接入状态信息，例如接入成功，接入失败，msg3发送成功，msg3发送失败，竞争解决成功，竞争解决失败等。
图12是本申请实施例的终端设备与第一网络设备和第二网络设备信息交互的整体时序图。总而言之，对于发送接入消息的第一时间段，可以设计相应的前置UL-Grant和后置UL-Grant，前置UL-Grant用于发送第一指示信息，后置UL-Grant用于发送反馈消息或RLC/PDCP状态报告。
当终端设备需要向第一网络设备发送数据时，还可以执行840，在该第一时间段外，该终端设备根据该第一网络设备的调度指示向该第一网络设备发送上行数据。也就是说，在终端设备在有要向第一网络设备发送的上行数据时，需要在第一时间段之外的时间发送。
本申请实施例涉及到的第一时间段、时间段集合或UL-grant的配置，都是针对第二网络设备的。如果存在多个切换候选的网络设备，可以为每个网络设备或部分网络设备进行上述配置。
在上述技术方案中，终端设备在需要从第一网络设备切换至第二网络设备时，向第一网络设备指示一个时间段，在该时间段内终端设备向第二网络设备发送接入消息，在该时 间段之外终端设备可以向第一网络设备发送上行数据，也就是说，终端设备仅在向第二网络设备发送接入消息(例如，随机接入前导码、切换完成消息或重配置完成消息)时才中断与第一网络设备的上行数据传输。这样，在终端设备随机接入第二网络设备的过程中，该时间段之外的其他时间终端设备同样可以向第一网络设备发送上行数据，从而使得具有双收单发的终端设备在与源网络设备进行数据传输的同时完成针对目标网络设备的随机接入过程。
下面结合图13至图16对本申请的装置实施例进行描述。
图13是本申请实施例的终端设备的示意性结构图。图13所示的终端设备1300可以对应于上文的终端设备，如图13所示，终端设备1300包括接收模块1310、发送模块1320。
接收模块1310，接收第一网络设备发送的切换消息，该切换消息用于指示该终端设备1300从该第一网络设备切换至第二网络设备，或者指示至少一个切换候选网络设备，该至少一个切换候选网络设备包括该第二网络设备。
发送模块1320，向该第一网络设备发送第一指示信息，该第一指示信息用于指示第一时间段；在该第一时间段内，向该第二网络设备发送接入消息，该接入消息用于接入该第二网络设备；在该第一时间段外，根据该第一网络设备的调度指示向该第一网络设备发送上行数据。
可选地，该第一指示信息包括该第一时间段的时长和结束时刻中的至少一个，以及起始时刻。
可选地，该发送模块1320，还用于在该终端设备1300向该第一网络设备发送第一指示信息之前，向该第一网络设备发送第二指示信息，该第二指示信息用于指示时间段集合，该时间段集合包括多个时间段，该多个时间段包括该第一时间段；该第一指示信息用于指示该时间段集合中的该第一时间段。
可选地，该第二指示信息具体用于指示第二时间段的时长和结束时刻中的至少一个，以及起始时刻和该第二时间段的周期，周期出现的多个该第二时间段构成该多个时间段。
可选地，该接入消息为随机接入前导码、切换完成消息或重配置完成消息。
可选地，用于传输该第一指示信息的时频资源是预配置，该用于传输该第一指示信息的时频资源周期出现。
可选地，该发送模块1320，还用于在该第一时间段之后，向该第一网络设备发送反馈消息，该反馈消息用于指示在该第一时间段内该第一网络设备与该终端设备1300之间的下行传输是否成功。
可选地，该反馈消息包括每次下行传输的反馈信息，或者每个子帧的反馈信息，或者每个混合自动重传请求HARQ进程的反馈信息。
可选地，该用于传输该反馈消息的时频资源是预配置，该用于传输该反馈消息的时频资源周期出现。
接收模块1310和发送模块1320可以由收发器实现。接收模块1310和发送模块1320的具体功能和有益效果可以参见图8所示的方法，在此就不再赘述。
图14是本申请实施例的网络设备的示意性结构图。图14所示的网络设备1400可以对应于上文的第一网络设备，如图14所示，网络设备1400包括接收模块1410、发送模块1420。
发送模块1420，用于向终端设备发送切换消息，该切换消息用于指示该终端设备从该网络设备1400切换至第二网络设备，或者指示至少一个切换候选网络设备，该至少一个切换候选网络设备包括该第二网络设备。
接收模块1410，用于接收该终端设备发送的第一指示信息，该第一指示信息用于指示第一时间段，该第一时间段是该终端设备向该第二网络设备发送接入消息的时段，该接入消息用于接入该第二网络设备，在该终端设备接入该第二网络设备的过程中除该第一时间段之外的时段是该终端设备向网络设备1400发送上行数据的时段。
可选地，该第一指示信息包括该第一时间段的时长和结束时刻中的至少一个，以及起始时刻。
可选地，该接收模块1410，还用于在该网络设备1400接收该终端设备发送的第一指示信息之前，接收该终端设备发送的第二指示信息，该第二指示信息用于指示时间段集合，该时间段集合包括多个时间段，该多个时间段包括该第一时间段；该第一指示信息用于指示该时间段集合中的该第一时间段。
可选地，该第二指示信息具体用于指示第二时间段的时长和结束时刻中的至少一个，以及起始时刻和该第二时间段的周期，周期出现的多个该第二时间段构成该多个时间段。
可选地，该接入消息为随机接入前导码、切换完成消息或重配置完成消息。
可选地，用于传输该第一指示信息的时频资源是预配置，该用于传输该第一指示信息的时频资源周期出现。
可选地，该接受模块1410，还用于在该第一时间段之后，接收该终端设备发送的反馈消息，该反馈消息用于指示在该第一时间段内该网络设备1400与该终端设备之间的下行传输是否成功。
可选地，该反馈消息包括每次下行传输的反馈信息，或者每个子帧的反馈信息，或者每个混合自动重传请求HARQ进程的反馈信息。
可选地，该用于传输该反馈消息的时频资源是预配置或者由该网络设备1400调度的，该用于传输该反馈消息的时频资源周期出现。
接收模块1410和发送模块1420可以由收发器实现。接收模块1410和发送模块1420的具体功能和有益效果可以参见图8所示的方法，在此就不再赘述。
图15是本申请另一实施例提供的终端设备的示意性结构图。图15所示的终端设备1500可以对应于上文的终端设备，如图15所示，终端设备1500包括收发器1510、处理器1520、存储器1530。
图15中仅示出了一个存储器和处理器。在实际的终端设备产品中，可以存在一个或多个处理器和一个或多个存储器。存储器也可以称为存储介质或者存储设备等。存储器可以是独立于处理器设置，也可以是与处理器集成在一起，本申请实施例对此不做限制。
收发器1510、处理器1520、存储器1530之间通过内部连接通路互相通信，传递控制和/或数据信号。
具体地，收发器1510，用于接收第一网络设备发送的切换消息，该切换消息用于指示该终端设备1300从该第一网络设备切换至第二网络设备，或者指示至少一个切换候选网络设备，该至少一个切换候选网络设备包括该第二网络设备；向该第一网络设备发送第一指示信息，该第一指示信息用于指示第一时间段；在该第一时间段内，向该第二网络设 备发送接入消息，该接入消息用于接入该第二网络设备；在该第一时间段外，根据该第一网络设备的调度指示向该第一网络设备发送上行数据。
网络设备1500的具体工作过程和有益效果可以参见图8所示实施例中的描述，在此不再赘述。
图16是本申请另一实施例提供的网络设备的示意性结构图。图16所示的网络设备1600可以对应于上文的第一网络设备，如图16所示，网络设备1600包括收发器1610、处理器1620、存储器1630。
图16中仅示出了一个存储器和处理器。在实际的网络设备产品中，可以存在一个或多个处理器和一个或多个存储器。存储器也可以称为存储介质或者存储设备等。存储器可以是独立于处理器设置，也可以是与处理器集成在一起，本申请实施例对此不做限制。
收发器1610、处理器1620、存储器1630之间通过内部连接通路互相通信，传递控制和/或数据信号。
具体地，收发器1610，用于向终端设备发送切换消息，该切换消息用于指示该终端设备从该网络设备1400切换至第二网络设备，或者指示至少一个切换候选网络设备，该至少一个切换候选网络设备包括该第二网络设备；接收该终端设备发送的第一指示信息，该第一指示信息用于指示第一时间段，该第一时间段是该终端设备向该第二网络设备发送接入消息的时段，该接入消息用于接入该第二网络设备，在该终端设备接入该第二网络设备的过程中除该第一时间段之外的时段是该终端设备向网络设备1400发送上行数据的时段。
网络设备1600的具体工作过程和有益效果可以参见图8所示实施例中的描述，在此不再赘述。
本申请各实施例该的收发器也可以称为收发单元、收发机、收发装置等。处理器也可以称为处理单元，处理单板，处理模块、处理装置等。可选的，可以将收发器中用于实现接收功能的器件视为接收单元，将收发器中用于实现发送功能的器件视为发送单元，即收发器包括接收单元和发送单元。接收单元有时也可以称为接收机、接收器、或接收电路等。发送单元有时也可以称为发射机、发射器或者发射电路等。
本申请各实施例所述的存储器用于存储处理器运行所需的计算机指令和参数。
本申请各实施例所述的处理器可能是一种集成电路芯片，具有信号的处理能力。在实现过程中，上述方法的各步骤可以通过处理器中的硬件的集成逻辑电路或者软件形式的指令完成。本申请各实施例所述的处理器可以是通用处理器、数字信号处理器(digital signal processor，DSP)、专用集成电路(application specific integrated circuit，ASIC)、现成可编程门阵列(field programmable gate array，FPGA)或者其他可编程逻辑器件、分立门或者晶体管逻辑器件、分立硬件组件。可以实现或者执行本申请实施例中的公开的各方法、步骤及逻辑框图。通用处理器可以是微处理器或者该处理器也可以是任何常规的处理器等。结合本申请实施例所公开的方法的步骤可以直接体现为硬件译码处理器执行完成，或者用译码处理器中的硬件及软件模块组合执行完成。软件模块可以位于随机存取存储器(random access memory，RAM)、闪存、只读存储器(read-only memory，ROM)、可编程只读存储器或者电可擦写可编程存储器、寄存器等本领域成熟的存储介质中。该存储介质位于存储器，处理器读取存储器中的指令，结合其硬件完成上述方法的步骤。
在本申请的各种实施例中，各过程的序号的大小并不意味着执行顺序的先后，各过程的执行顺序应以其功能和内在逻辑确定，而不应对本申请实施例的实施过程构成任何限定。
在上述实施例中，可以全部或部分地通过软件、硬件、固件或者其他任意组合来实现。当使用软件实现时，可以全部或部分地以计算机程序产品的形式实现。所述计算机程序产品包括一个或多个计算机指令。在计算机上加载和执行所述计算机程序指令时，全部或部分地产生按照本申请实施例所述的流程或功能。所述计算机可以是通用计算机、专用计算机、计算机网络、或者其他可编程装置。所述计算机指令可以存储在计算机可读存储介质中，或者从一个计算机可读存储介质向另一个计算机可读存储介质传输，例如，所述计算机指令可以从一个网站站点、计算机、服务器或数据中心通过有线(例如同轴电缆、光纤、数字用户线(digital subscriber line，DSL))或无线(例如红外、无线、微波等)方式向另一个网站站点、计算机、服务器或数据中心进行传输。所述计算机可读存储介质可以是计算机能够存取的任何可用介质或者是包括一个或多个可用介质集成的服务器、数据中心等数据存储设备。所述可用介质可以是磁性介质(例如，软盘、硬盘、磁带)、光介质(例如数字视频光盘(digital video disc，DVD))、或者半导体介质(例如固态硬盘(solid state disk，SSD))等。
可以理解的是，本申请实施例中第一网络设备和第二网络设备中的“第一”和“第二”仅是为了区分不同的网络设备，而并非是对网络设备本身功能进行限定。一个网络设备既可以作为第一网络设备，也可以作为第二网络设备。
本领域普通技术人员可以意识到，结合本文中所公开的实施例描述的各示例的单元及算法步骤，能够以电子硬件、或者计算机软件和电子硬件的结合来实现。这些功能究竟以硬件还是软件方式来执行，取决于技术方案的特定应用和设计约束条件。专业技术人员可以对每个特定的应用来使用不同方法来实现所描述的功能，但是这种实现不应认为超出本申请的范围。
所属领域的技术人员可以清楚地了解到，为描述的方便和简洁，上述描述的系统、装置和单元的具体工作过程，可以参考前述方法实施例中的对应过程，在此不再赘述。
在本申请所提供的几个实施例中，应该理解到，所揭露的系统、装置和方法，可以通过其它的方式实现。例如，以上所描述的装置实施例仅仅是示意性的，例如，所述单元的划分，仅仅为一种逻辑功能划分，实际实现时可以有另外的划分方式，例如多个单元或组件可以结合或者可以集成到另一个系统，或一些特征可以忽略，或不执行。另一点，所显示或讨论的相互之间的耦合或直接耦合或通信连接可以是通过一些接口，装置或单元的间接耦合或通信连接，可以是电性，机械或其它的形式。
所述作为分离部件说明的单元可以是或者也可以不是物理上分开的，作为单元显示的部件可以是或者也可以不是物理单元，即可以位于一个地方，或者也可以分布到多个网络单元上。可以根据实际的需要选择其中的部分或者全部单元来实现本实施例方案的目的。
另外，在本申请各个实施例中的各功能单元可以集成在一个处理单元中，也可以是各个单元单独物理存在，也可以两个或两个以上单元集成在一个单元中。
所述功能如果以软件功能单元的形式实现并作为独立的产品销售或使用时，可以存储在一个计算机可读取存储介质中。基于这样的理解，本申请的技术方案本质上或者说对现 有技术做出贡献的部分或者该技术方案的部分可以以软件产品的形式体现出来，该计算机软件产品存储在一个存储介质中，包括若干指令用以使得一台计算机设备(可以是个人计算机，服务器，或者网络设备等)执行本申请各个实施例所述方法的全部或部分步骤。而前述的存储介质包括：U盘、移动硬盘、只读存储器(read-only memory，ROM)、随机存取存储器(random access memory，RAM)、磁碟或者光盘等各种可以存储程序代码的介质。
以上所述，仅为本申请的具体实施方式，但本申请的保护范围并不局限于此，任何熟悉本技术领域的技术人员在本申请揭露的技术范围内，可轻易想到变化或替换，都应涵盖在本申请的保护范围之内。因此，本申请的保护范围应以所述权利要求的保护范围为准。

Claims (22)

  1. 一种切换网络设备的方法，其特征在于，包括：
    终端设备接收第一网络设备发送的切换消息，所述切换消息用于指示所述终端设备从所述第一网络设备切换至第二网络设备，或者指示至少一个切换候选网络设备，所述至少一个切换候选网络设备包括所述第二网络设备；
    所述终端设备向所述第一网络设备发送第一指示信息，所述第一指示信息用于指示第一时间段；
    在所述第一时间段内，所述终端设备向所述第二网络设备发送接入消息，所述接入消息用于接入所述第二网络设备；在所述第一时间段外，所述终端设备根据所述第一网络设备的调度指示向所述第一网络设备发送上行数据。
  2. 根据权利要求1所述的方法，其特征在于，所述第一指示信息包括所述第一时间段的时长和结束时刻中的至少一个，以及起始时刻。
  3. 根据权利要求1所述的方法，其特征在于，在所述终端设备向所述第一网络设备发送第一指示信息之前，所述方法还包括：
    所述终端设备向所述第一网络设备发送第二指示信息，所述第二指示信息用于指示时间段集合，所述时间段集合包括多个时间段，所述多个时间段包括所述第一时间段；
    所述第一指示信息用于指示所述时间段集合中的所述第一时间段。
  4. 根据权利要求3所述的方法，其特征在于，所述第二指示信息具体用于指示第二时间段的时长和结束时刻中的至少一个，以及起始时刻和所述第二时间段的周期，周期出现的多个所述第二时间段构成所述多个时间段。
  5. 根据权利要求1至4中任一项所述的方法，其特征在于，所述接入消息为随机接入前导码、切换完成消息或重配置完成消息。
  6. 根据权利要求1至5中任一项所述的方法，其特征在于，用于传输所述第一指示信息的时频资源是预配置，所述用于传输所述第一指示信息的时频资源周期出现。
  7. 根据权利要求1至6中任一项所述的方法，其特征在于，所述方法还包括：
    在所述第一时间段之后，所述终端设备向所述第一网络设备发送反馈消息，所述反馈消息用于指示在所述第一时间段内所述第一网络设备与所述终端设备之间的下行传输是否成功。
  8. 根据权利要求7所述的方法，其特征在于，所述反馈消息包括每次下行传输的反馈信息，或者每个子帧的反馈信息，或者每个混合自动重传请求HARQ进程的反馈信息。
  9. 根据权利要求7或8所述的方法，其特征在于，所述用于传输所述反馈消息的时频资源是预配置，所述用于传输所述反馈消息的时频资源周期出现。
  10. 一种切换网络设备的方法，其特征在于，包括：
    第一网络设备向终端设备发送切换消息，所述切换消息用于指示所述终端设备从所述第一网络设备切换至第二网络设备，或者指示至少一个切换候选网络设备，所述至少一个切换候选网络设备包括所述第二网络设备；
    所述第一网络设备接收所述终端设备发送的第一指示信息，所述第一指示信息用于指 示第一时间段，所述第一时间段是所述终端设备向所述第二网络设备发送接入消息的时段，所述接入消息用于接入所述第二网络设备，在所述终端设备接入所述第二网络设备的过程中除所述第一时间段之外的时段是所述终端设备向所述第一网络设备发送上行数据的时段。
  11. 根据权利要求10所述的方法，其特征在于，所述第一指示信息包括所述第一时间段的时长和结束时刻中的至少一个，以及起始时刻。
  12. 根据权利要求10所述的方法，其特征在于，在所述第一网络设备接收所述终端设备发送的第一指示信息之前，所述方法还包括：
    所述第一网络设备接收所述终端设备发送的第二指示信息，所述第二指示信息用于指示时间段集合，所述时间段集合包括多个时间段，所述多个时间段包括所述第一时间段；
    所述第一指示信息用于指示所述时间段集合中的所述第一时间段。
  13. 根据权利要求12所述的方法，其特征在于，所述第二指示信息具体用于指示第二时间段的时长和结束时刻中的至少一个，以及起始时刻和所述第二时间段的周期，周期出现的多个所述第二时间段构成所述多个时间段。
  14. 根据权利要求10至13中任一项所述的方法，其特征在于，所述接入消息为随机接入前导码、切换完成消息或重配置完成消息。
  15. 根据权利要求10至14中任一项所述的方法，其特征在于，用于传输所述第一指示信息的时频资源是预配置，所述用于传输所述第一指示信息的时频资源周期出现。
  16. 根据权利要求10至15中任一项所述的方法，其特征在于，所述方法还包括：
    在所述第一时间段之后，所述第一网络设备接收所述终端设备发送的反馈消息，所述反馈消息用于指示在所述第一时间段内所述第一网络设备与所述终端设备之间的下行传输是否成功。
  17. 根据权利要求16所述的方法，其特征在于，所述反馈消息包括每次下行传输的反馈信息，或者每个子帧的反馈信息，或者每个混合自动重传请求HARQ进程的反馈信息。
  18. 根据权利要求16或17所述的方法，其特征在于，所述用于传输所述反馈消息的时频资源是预配置或者由所述第一网络设备调度的，所述用于传输所述反馈消息的时频资源周期出现。
  19. 一种终端设备，其特征在于，包括收发器、处理器和存储器，用于执行如权利要求1至9中任一项所述的方法。
  20. 一种网络设备，其特征在于，包括收发器、处理器和存储器，用于执行如权利要求10至18中任一项所述的方法。
  21. 一种计算机可读存储介质，其特征在于，包括指令，当所述指令在终端设备上运行时，使得终端设备执行如权利要求1至9中任一项所述的方法。
  22. 一种计算机可读存储介质，其特征在于，包括指令，当所述指令在网络设备上运行时，使得网络设备执行如权利要求10至18中任一项所述的方法。
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CN107809778A (zh) * 2016-09-08 2018-03-16 中兴通讯股份有限公司 一种基站切换方法及装置

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