WO2020186407A1 - 小区切换方法、装置、网络设备、终端设备及存储介质 - Google Patents

小区切换方法、装置、网络设备、终端设备及存储介质 Download PDF

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Publication number
WO2020186407A1
WO2020186407A1 PCT/CN2019/078363 CN2019078363W WO2020186407A1 WO 2020186407 A1 WO2020186407 A1 WO 2020186407A1 CN 2019078363 W CN2019078363 W CN 2019078363W WO 2020186407 A1 WO2020186407 A1 WO 2020186407A1
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WIPO (PCT)
Prior art keywords
network device
timer
handover
duration
cell
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Ceased
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PCT/CN2019/078363
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English (en)
French (fr)
Inventor
尤心
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Guangdong Oppo Mobile Telecommunications Corp Ltd
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Guangdong Oppo Mobile Telecommunications Corp Ltd
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Publication date
Application filed by Guangdong Oppo Mobile Telecommunications Corp Ltd filed Critical Guangdong Oppo Mobile Telecommunications Corp Ltd
Priority to PCT/CN2019/078363 priority Critical patent/WO2020186407A1/zh
Priority to CN202110519030.3A priority patent/CN113271638B/zh
Priority to EP19919688.2A priority patent/EP3923627B1/en
Priority to CN201980058984.XA priority patent/CN112690019A/zh
Publication of WO2020186407A1 publication Critical patent/WO2020186407A1/zh
Priority to US17/468,448 priority patent/US12273781B2/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0011—Control or signalling for completing the hand-off for data sessions of end-to-end connection
    • H04W36/0033—Control or signalling for completing the hand-off for data sessions of end-to-end connection with transfer of context information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/30—Connection release
    • H04W76/38—Connection release triggered by timers
    • 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
    • H04W36/24—Reselection being triggered by specific parameters
    • H04W36/30—Reselection being triggered by specific parameters by measured or perceived connection quality data
    • H04W36/302—Reselection being triggered by specific parameters by measured or perceived connection quality data due to low signal strength
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/34—Reselection control
    • H04W36/36—Reselection control by user or terminal equipment
    • H04W36/362—Conditional handover
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0055—Transmission or use of information for re-establishing the radio link
    • H04W36/0064—Transmission or use of information for re-establishing the radio link of control information between different access points
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • H04W74/0833—Random access procedures, e.g. with 4-step access
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • H04W74/0833—Random access procedures, e.g. with 4-step access
    • H04W74/0838—Random access procedures, e.g. with 4-step access using contention-free random access [CFRA]

Definitions

  • This application relates to, but is not limited to, the field of communications, in particular to a cell handover method, device, network equipment, terminal equipment, and storage medium.
  • the terminal device In the process of cell handover in wireless communication, usually after receiving the handover command from the target base station forwarded by the source base station, the terminal device immediately starts the handover timer (such as T304 or T307) and accesses the target cell.
  • the target base station After responding to the handover request of the source base station, the target base station also configures and manages the resources allocated to the terminal device for accessing the target cell according to the immediate handover procedure.
  • conditional handover CHO, Conditional Handover
  • embodiments of the present disclosure provide a cell handover method, including:
  • the first network device sends a handover request to the second network device, where the handover request includes at least one of the following: conditional handover indication information and duration suggestion information for the first timer;
  • the first network device receives a handover command sent by the second network device, where the handover command includes configuration information for handover and the duration of the first timer, and the first timer is used to control the The effective time of the configuration information in the switching command;
  • the first network device sends the switching command to the terminal device and the conditions set by the first network device for the terminal device to initiate switching to the second network device.
  • the embodiments of the present disclosure provide a cell handover method, including:
  • the second network device receives a handover request sent by the first network device, where the handover request includes at least one of the following: conditional switch indication information, and duration suggestion information for the first timer;
  • the second network device sends a handover command to the first network device, where the handover command includes configuration information for handover and the duration of the first timer, and the first timer is used to control the handover The effective time of the configuration information in the command.
  • the embodiments of the present disclosure provide a cell handover method, including:
  • the terminal device receives the switching command sent by the first network device and the conditions set by the first network device for the terminal device to initiate switching to the second network device, and the switching command includes the configuration information for switching and the first timing The duration of the device, the first timer is used to control the valid time of the configuration information in the switching command;
  • the terminal device When the first timer has not expired and the condition for initiating a handover to the second network device is satisfied, the terminal device initiates a process of accessing the cell of the second network device.
  • embodiments of the present disclosure provide a network device, including:
  • the sending unit is configured to send a handover request to the second network device, where the handover request includes at least one of the following: conditional handover indication information and duration suggestion information for the first timer;
  • the receiving unit is configured to receive a handover command sent by the second network device, where the handover command includes configuration information for handover and the duration of the first timer, and the first timer is used to control the handover The effective time of the configuration information in the command;
  • the sending unit is further configured to send the switching command and the conditions set by the network device for the terminal device to initiate switching to the second network device to the terminal device.
  • embodiments of the present disclosure provide a network device, including:
  • the receiving unit is configured to receive a handover request sent by the first network device, where the handover request includes at least one of the following: conditional switch indication information, and duration suggestion information for the first timer;
  • a processing unit configured to configure the duration of the first timer according to at least one of the condition switching instruction information and the duration suggestion information for the first timer;
  • a sending unit configured to send a handover command to the first network device, the handover command including configuration information for handover and the duration of the first timer, the first timer being used to control the handover command The effective time of the configuration information in.
  • embodiments of the present disclosure provide a terminal device, including:
  • the receiving unit is configured to receive the switching command sent by the first network device and the condition set by the first network device for the terminal device to initiate switching to the second network device, and the switching command includes configuration information for switching And the duration of a first timer, where the first timer is used to control the valid time of the configuration information in the handover command;
  • the processing unit is configured to start the first timer when the handover command is received, and when the first timer does not expire and the condition for initiating handover to the second network device is met, initiate access to the office Describe the process of the cell of the second network device.
  • the embodiments of the present disclosure provide a network device, including a memory, a processor, and a computer program stored on the memory and running on the processor.
  • the processor executes the computer program, The cell handover method described in the first aspect is implemented.
  • the embodiments of the present disclosure provide a network device, including a memory, a processor, and a computer program stored on the memory and running on the processor.
  • the processor executes the computer program, Implement the cell handover method described in the second aspect.
  • the embodiments of the present disclosure provide a terminal device, including a memory, a processor, and a computer program stored on the memory and running on the processor.
  • the processor executes the computer program, Implement the cell handover method described in the third aspect.
  • embodiments of the present disclosure provide a computer-readable storage medium having a computer program stored thereon, and the computer program implements the cell handover method described in the first aspect when the computer program is executed by a processor.
  • an embodiment of the present disclosure provides a computer-readable storage medium having a computer program stored thereon, and the computer program implements the cell handover method described in the second aspect when the computer program is executed by a processor.
  • embodiments of the present disclosure provide a computer-readable storage medium having a computer program stored thereon, and the computer program, when executed by a processor, implements the cell handover method described in the third aspect.
  • FIG. 1 is a schematic diagram of an application scenario of an exemplary embodiment of the present disclosure
  • Figure 2 is a schematic diagram of a cell handover procedure
  • Fig. 3 is a flowchart of a cell handover method according to an exemplary embodiment of the present disclosure
  • FIG. 4 is a flowchart of a cell handover method according to another exemplary embodiment of the present disclosure.
  • Fig. 5 is a flowchart of a cell handover method according to still another exemplary embodiment of the present disclosure.
  • Fig. 6 is a flowchart of a cell handover method in an example of the present disclosure
  • Fig. 7 is a flowchart of a cell handover method in another example of the present disclosure.
  • Fig. 8 is a schematic diagram of an exemplary application scenario of the present disclosure.
  • Fig. 9 is a schematic diagram of another exemplary application scenario of the present disclosure.
  • FIG. 10 is a schematic diagram of a logical structure of a network device according to an exemplary embodiment of the present disclosure.
  • FIG. 11 is a schematic diagram of a logical structure of a network device according to another exemplary embodiment of the present disclosure.
  • FIG. 12 is a schematic diagram of a logical structure of a terminal device according to an exemplary embodiment of the present disclosure.
  • FIG. 13 is a schematic diagram of the hardware structure of a network device according to an exemplary embodiment of the present disclosure.
  • FIG. 14 is a schematic diagram of the hardware structure of a terminal device according to an exemplary embodiment of the present disclosure.
  • Fig. 1 is a schematic diagram of an application scenario of an exemplary embodiment of the present disclosure.
  • the communication system may include a terminal 100 and at least two network devices 120 and 140.
  • the terminal device 100 can communicate with a network device through an air interface. For example, when the terminal device 100 is located in the cell of the network device 120, it can exchange information with the network device 120. When the terminal device 100 moves from the cell of the network device 120 to the cell of the network device 140, a handover will occur.
  • the terminal device 100 can exchange information with the network device 140.
  • the network devices for example, the network devices 120 and 140, can communicate with each other.
  • LTE Long Term Evolution
  • TDD Time Division Duplex
  • UMTS Universal Mobile Telecommunication System
  • 5G New Radio NR New Radio NR
  • the network devices 120 and 140 may be evolutionary base stations (Evolutional Node B, eNB or eNodeB) in LTE, base station devices in a 5G network, or base stations in a future communication system.
  • evolutionary base stations Evolutional Node B, eNB or eNodeB
  • base station devices in a 5G network
  • base stations in a future communication system.
  • the terminal 100 may communicate with one or more core networks (Core Network) via a radio access network (Radio Access Network, RAN), and may also be referred to as an access terminal, user equipment (UE), or user unit.
  • Core Network Radio Access Network
  • RAN Radio Access Network
  • User station mobile station, mobile station, remote station, remote terminal, mobile device, user terminal, terminal, wireless communication device, user agent or user device.
  • the terminal 100 may be a cellular phone, a cordless phone, a Session Initiation Protocol (SIP) phone, a wireless local loop (Wireless Local Loop, WLL) station, a personal digital processing (Personal Digital Assistant, PDA), and wireless Handheld devices with communication functions, computing devices, or other processing devices connected to wireless modems, in-vehicle devices, wearable devices, or terminal devices in 5G networks, etc.
  • SIP Session Initiation Protocol
  • WLL Wireless Local Loop
  • PDA Personal Digital Assistant
  • Figure 2 is a schematic diagram of a cell handover procedure.
  • the main process of cell handover may include three stages: handover preparation stage, handover execution stage, and handover completion stage.
  • the source base station is the base station of the cell where the terminal device is currently located, and the target base station is the base station of the target cell to which the terminal device is handed over.
  • the source base station can configure the terminal device to perform measurement reporting, and send a handover request to the target base station based on the measurement report reported by the terminal device.
  • the target base station configures a handover command for the terminal device, including dedicated random access channel (RACH, Random Access Channel) resources, and cell radio network temporary identification (C-RNTI, Cell Radio Network) Temporary Identifier), the security algorithm of the target base station, and the system message of the target base station (the system message includes public RACH resources), etc.
  • the dedicated RACH resource may include a dedicated preamble for contention-free random access
  • the public RACH resource is the RACH resource for contention-based random access.
  • the source base station can forward the handover command to the terminal device through a radio resource control (Radio Resource Control, RRC) message (such as an RRC connection reconfiguration message or an RRC reconfiguration message).
  • RRC Radio Resource Control
  • a random access procedure can be initiated to the target base station.
  • the source base station sends a sequence number (SN, Sequence Number) status (Status) to the target base station to inform the target base station of the uplink packet data convergence protocol (PDCP, Packet Data Convergence Protocol) SN reception status and the downlink PDCP SN transmission status.
  • PDCP Packet Data Convergence Protocol
  • the target base station when the terminal device successfully accesses the target base station (random access is successful), the target base station sends a path switch request (Path Switch Request) to the mobility management entity (MME, Mobility Management Entity), Request the MME to switch the downlink path; the MME sends a Modify Bearer Request to the Serving Gateway (SGW) for downlink path switching; after the path switching is completed, the target base station instructs the source base station to release the context of the terminal device, thereby completing the cell switching.
  • Path Switch Request path switch request
  • MME Mobility Management Entity
  • SGW Serving Gateway
  • the timer can be used during the switching process. Examples of timers that can be used during handover are shown in Table 1 below.
  • the duration of the timers T312 and T310 can be configured by the source base station, and the duration of the timers T304 and T307 can be configured by the target base station.
  • the timer T312 is started when the measurement report is sent. If the timer expires, the terminal device returns to the idle state (IDLE) or initiates a connection re-establishment process.
  • the premise of the timer T312 is that the timer T310 is running. When the terminal device receives multiple out-of-sync indications reported by the physical layer, the timer T310 is started. However, because the timer T310 has a large duration, it cannot be avoided Handover too late (for example, the handover command has not been received), so the timer T312 is introduced to avoid the handover too late. When the UE receives a handover command, both timers T310 and T312 will stop.
  • timers T304 and T307 are both started when the terminal device receives a handover command, and are used to control the effective time of the configured RACH resource and limit the time for the terminal device to access the target base station or secondary node (SN) .
  • the terminal device can be configured with a handover command in advance through conditional handover (Conditional Handover).
  • conditional handover Conditional Handover
  • the operating trajectory of the terminal device is specific, so the source base station can configure the target base station for the terminal device in advance, and send the terminal device a condition for triggering the terminal device to switch.
  • the handover condition may be sent to the terminal device when the source base station forwards the handover command through an RRC message.
  • the terminal device may initiate an access request to the target base station.
  • the condition for triggering the terminal device to switch may be set based on the received signal of the terminal device and/or the geographic location of the terminal device.
  • the handover condition can be set based on one or more of the following: the signal strength of the target cell (for example, the reference signal received power (RSRP) of the target cell), the signal quality of the target cell ( For example, the reference signal received quality of the target cell (Reference Signal Received Quality, RSRQ)), the signal-to-noise ratio (Signal Noise Ratio, SNR) of the target cell, the comparison of the signal of the target cell with the signal of the source cell, the terminal The absolute geographic location of the device, and the distance between the terminal device and the source base station.
  • RSRP reference signal received power
  • RSRQ Reference Signal Received Quality
  • SNR Signal-to-noise ratio
  • the condition for triggering the terminal device to perform handover may include: the signal strength of the target cell is greater than a certain threshold, or may include: the signal strength of the target cell is higher than the signal strength of the cell where the terminal is currently located by a certain offset, or Including: the terminal device reaches the border area of the source cell or the distance from the source base station is greater than a certain threshold.
  • the target cell refers to the cell of the target base station
  • the source cell refers to the cell of the source base station.
  • the terminal device when the terminal device receives the handover command of the target base station forwarded by the source base station, immediately starts a handover timer (for example, timer T304 or T307) and initiates an access procedure to the target cell.
  • a handover timer for example, timer T304 or T307
  • the target base station responds to the handover request of the source base station, it also configures and manages the resources allocated to the terminal device for accessing the target cell according to the immediate handover procedure.
  • the terminal device does not execute the switching immediately after receiving the switching command, but only executes the switching when the switching conditions are met.
  • the target base station still configures and manages the resources allocated to the terminal equipment for accessing the target cell and sets the duration of the handover timer according to the immediate handover procedure, then the handover timer is likely to be triggered when the handover condition is triggered It has timed out, causing the terminal device to fail to initiate a handover to the target cell.
  • Exemplary embodiments of the present disclosure provide a cell handover method, which enables a target base station to reasonably maintain resources allocated to terminal equipment for conditional handover through handover request and handover command configuration and handover execution mode for conditional handover, thereby The terminal device can access the target cell under effective resources when performing conditional handover.
  • An exemplary embodiment of the present disclosure provides a cell handover method. As shown in FIG. 3, the method may include operations 301-303.
  • the first network device sends a handover request to the second network device, and the handover request includes at least one of the following: conditional handover indication information and duration suggestion information for the first timer.
  • the first network device may be a source base station in a cell handover
  • the second network device may be a target base station in a cell handover
  • conditional switching indication information may be used to indicate that the switching request is for conditional switching.
  • the recommended duration information for the first timer may include at least one of the following: a recommended duration of the first timer, and an estimated duration required for the terminal device to reach the cell of the second network device.
  • the conditional switching indication information and/or the duration suggestion information for the first timer is used for the second network device to set a reasonable duration of the first timer for the conditional switching.
  • the second network device may configure a longer length of the first timer, so that the terminal device satisfies the switching condition
  • the first timer may not have timed out, thereby improving the success rate of the terminal device initiating the handover.
  • the first timer may be the switching timer T304 or T307.
  • the first network device may determine the recommended duration information for the first timer according to at least one of the following: the moving speed of the terminal device, the moving direction of the terminal device The signal quality of the serving cell currently reported by the terminal device.
  • the first network device can determine the movement of the terminal device according to the moving speed, direction of movement, and/or the signal quality of the currently reported serving cell of the terminal device, so as to generate the suggested duration of the first timer And/or estimate the length of time required for the terminal device to reach the cell of the second network device, and send it to the second network device as time length suggestion information for the first timer.
  • the method may further include: the first network device sending the updated duration recommendation information for the first timer to the second network device.
  • the first network device may perform every interval according to the position of the terminal device. Sending the updated duration suggestion information for the first timer to the second network device for a period of time or from time to time, so as to prevent the second network device from reserving switching resources for the terminal device for too long.
  • the first network device may send the updated duration suggestion information for the first timer through a handover request or other messages.
  • sending the handover request by the first network device to the second network device may include: at least one second network in the direction of movement of the first network device to the terminal device The device sends the handover request; or the first network device sends the handover request to at least one second network device around the first network device. Exemplary scenes are shown in Figure 8 and Figure 9.
  • the first network device receives a handover command sent by the second network device, and the handover command includes configuration information for handover and the duration of the first timer, and the first timer is used for For controlling the effective time of the configuration information in the switching command.
  • the configuration information for the handover in the handover command may include at least one of the following: dedicated RACH resource, C-RNTI, security algorithm of the second network device, system message of the second network device .
  • the dedicated RACH resource may include a dedicated preamble for non-competitive random access
  • the system message may include a public RACH resource
  • the public RACH resource is a RACH resource for competing random access.
  • the first timer is used to control the valid time of the configuration information in the handover command. For example, when the first timer expires, the configuration information in the handover command becomes invalid, and the terminal device cannot initiate handover to the second network device according to the configuration information.
  • the handover command may further include: the duration of a second timer configured for part of the resources of the cell used to access the second network device.
  • the second timer is used to control the effective time of the partial resources of the cell used to access the second network device.
  • the part of resources used to access the cell of the second network device may include dedicated RACH resources.
  • the dedicated RACH resource may include a dedicated preamble.
  • the second network device may set a separate timer for part of the configuration information in the handover command, for example, configure a separate second timer for the dedicated preamble in the dedicated RACH resource.
  • the duration of the second timer may be shorter than the duration of the first timer, so as to avoid reserving dedicated RACH resources for a long time.
  • a second timer for dedicated RACH resources will help the second network device to manage dedicated RACH resources and optimize the use of dedicated RACH resources in the cell. For example, when the second timer expires, the corresponding dedicated RACH Resources are reallocated to other terminal devices in the cell.
  • this disclosure is not limited to this.
  • the first network device sends the switching command to the terminal device and the conditions set by the first network device for the terminal device to initiate switching to the second network device.
  • the first network device may send the handover command to the terminal device through an RRC message (for example, an RRC connection reconfiguration message or an RRC reconfiguration message), and the RRC message may further include all The conditions set by the first network device for the terminal device to initiate handover to the second network device.
  • the first network device may set a condition for the terminal device to initiate handover to the second network device based on the received signal of the terminal device and/or the geographic location of the terminal device.
  • the handover condition may be set based on one or more of the following: the signal strength of the second network device cell (for example, the RSRP of the second network device cell), the signal quality of the second network device cell (for example, The RSRQ of the second network device cell), the signal-to-noise ratio (SNR) of the second network device cell, the comparison of the signal of the second network device cell with the signal of the first network device cell, and the absolute geographic location of the terminal device , The distance between the terminal device and the first network device.
  • the signal strength of the second network device cell for example, the RSRP of the second network device cell
  • the signal quality of the second network device cell for example, The RSRQ of the second network device cell
  • SNR signal-to-noise ratio
  • the condition that the terminal device initiates handover to the second network device set by the first network device may include: the signal strength of the second network device cell is greater than a certain threshold, or may include: the second network device cell
  • the signal strength of is higher than the signal strength of the first network device cell by a certain offset, or it may include: the terminal device reaches the boundary area of the first network device cell or the distance from the first network device is greater than a certain threshold. This disclosure does not specifically limit this.
  • An exemplary embodiment of the present disclosure provides a cell handover method. As shown in FIG. 4, the method may include operations 401-403.
  • the second network device receives a handover request sent by the first network device, and the handover request includes at least one of the following: conditional handover indication information, and duration suggestion information for the first timer.
  • the first network device may be a source base station in a cell handover
  • the second network device may be a target base station in a cell handover
  • conditional switching indication information may be used to indicate that the switching request is for conditional switching.
  • the recommended duration information for the first timer may include at least one of the following: a recommended duration of the first timer, and an estimated duration required for the terminal device to reach the cell of the second network device.
  • the method may further include: the second network device receiving the updated duration recommendation information for the first timer sent by the first network device.
  • the second network device periodically or non-periodically receives updated duration suggestion information for the first timer sent by the first network device.
  • the updated duration suggestion information for the first timer may be carried in a handover request or other messages.
  • the second network device configures the duration of the first timer according to at least one of the condition switching indication information and the duration suggestion information for the first timer.
  • the second network device configures the duration of the first timer according to at least one of the condition switching instruction information and the duration suggestion information for the first timer, which may Including: when the switching request includes the conditional switching indication information, the second network device determines according to the conditional switching indication information that the switching request is for conditional switching, and configuring the conditional switching The duration of the first timer; when the handover request includes the duration recommendation information for the first timer, the second network device configures the second network device according to the duration recommendation information for the first timer The duration of a timer; when the handover request includes the conditional switch instruction information and the duration suggestion information for the first timer, the second network device determines the switch according to the conditional switch instruction information The request is for condition switching, and the duration of the first timer is configured according to the duration suggestion information for the first timer. Specifically, when the second network device configures the duration of the first timer, the duration suggested by the first network device may be directly adopted, or the duration of the first timer may be independently configured based
  • the second network device may configure a reasonable duration of the first timer suitable for conditional switching according to the conditional switching instruction information from the first network device and/or the duration suggestion information for the first timer.
  • the second network device can set a longer length of the first timer, so that when the terminal device needs to initiate a handover to the cell of the second network device when the handover condition is met, the first timer may not have timed out, thereby improving the terminal device The success rate of initiating a handover.
  • the first timer may be the switching timer T304 or T307.
  • the second network device sends a handover command to the first network device, where the handover command includes configuration information for handover and the duration of the first timer, and the first timer is used for Controlling the effective time of the configuration information in the switching command.
  • the configuration information for the handover in the handover command may include at least one of the following: dedicated RACH resource, C-RNTI, security algorithm of the second network device, system message of the second network device .
  • the dedicated RACH resource may include a dedicated preamble for non-competitive random access
  • the system message may include a public RACH resource
  • the public RACH resource is a RACH resource for competing random access.
  • the first timer is used to control the valid time of the configuration information in the handover command. For example, when the first timer expires, the configuration information in the handover command becomes invalid, and the terminal device cannot initiate handover to the second network device according to the configuration information.
  • the method may further include: the second network device configures a second timer for part of the resources used to access the cell of the second network device;
  • the handover command sent by the first network device further includes the duration of the second timer.
  • the configuring, by the second network device, a second timer for a part of resources used to access the cell of the second network device may include: configuring the second timer for the dedicated RACH resource by the second network device.
  • the configuring the second timer for the dedicated RACH resource by the second network device may include: configuring the second timer for the dedicated preamble by the second network device.
  • the second network device may set a separate timer for part of the configuration information in the handover command, for example, configure a separate second timer for the dedicated preamble in the dedicated RACH resource.
  • the duration of the second timer may be shorter than the duration of the first timer, so as to avoid reserving dedicated RACH resources for a long time.
  • the introduction of a second timer for dedicated RACH resources will help the second network device to manage dedicated RACH resources and optimize the use of dedicated RACH resources in the cell. For example, when the second timer expires, the corresponding dedicated RACH Resources are reallocated to other terminal devices in the cell.
  • this disclosure is not limited to this.
  • An exemplary embodiment of the present disclosure provides a cell handover method. As shown in FIG. 5, the method may include operations 501-503.
  • a terminal device receives a handover command sent by a first network device and conditions set by the first network device for the terminal device to initiate handover to a second network device, and the handover command includes a configuration for switching Information and the duration of a first timer, where the first timer is used to control the valid time of the configuration information in the switching command.
  • the first network device may be a source base station in a cell handover
  • the second network device may be a target base station in a cell handover
  • the configuration information for the handover in the handover command may include at least one of the following: dedicated RACH resource, C-RNTI, security algorithm of the second network device, system message of the second network device .
  • the dedicated RACH resource may include a dedicated preamble for non-competitive random access
  • the system message may include a public RACH resource
  • the public RACH resource is a RACH resource for competing random access.
  • the first timer is used to control the valid time of the configuration information in the handover command. For example, when the first timer expires, the configuration information in the handover command becomes invalid, and the terminal device will not be able to initiate handover to the second network device according to the configuration information.
  • the terminal device may receive an RRC message (for example, an RRC connection reconfiguration message or an RRC reconfiguration message) from the first network device, the RRC message includes the handover command, and The RRC message may further include a condition set by the first network device for the terminal device to initiate a handover to the second network device.
  • RRC message for example, an RRC connection reconfiguration message or an RRC reconfiguration message
  • the terminal device starts the first timer when receiving the handover command.
  • the terminal device initiates a process of accessing the cell of the second network device.
  • the handover command may further include: the duration of a second timer configured for partial resource configuration of the cell used to access the second network device; the method may further include: The terminal device starts the second timer when receiving the handover command.
  • the second timer is used to control the effective time of the partial resources of the cell used to access the second network device.
  • the part of resources used to access the cell of the second network device may include a dedicated random access channel RACH resource.
  • the dedicated RACH resource may include a dedicated preamble.
  • the terminal device when the first timer does not expire and the condition for initiating handover to the second network device is satisfied, the terminal device initiates access to the cell of the second network device
  • the process may include: when the first timer has not expired and the condition for initiating handover to the second network device is met, and the second timer has not expired, the terminal device uses the dedicated RACH resource to The cell of the second network device initiates random access; when the first timer has not expired and the condition for initiating handover to the second network device is met, and the second timer has expired, the terminal The device uses the common RACH resource to initiate random access to the cell of the second network device.
  • the method may further include: when the first timer does not expire, the terminal device re-attempts to access the cell of the second network device, and the When the second timer has expired, the terminal device uses the common RACH resource to initiate random access to the cell. For example, when the terminal device fails to try to access the cell of the second network device, if the first timer has not expired, the terminal device will retry to access the cell of the second network device. At this time, if the second timer has expired, then The terminal device can initiate random access to the cell using the common RACH resource.
  • the method may further include: when the first timer has not expired and the cells in which there are multiple second network devices meet the condition for initiating handover, the terminal device selects The cell of the second network device whose second timer has not expired initiates an access procedure.
  • the method may further include: when the first timer has not expired and there are multiple cells of the second network device that meet the condition for initiating handover, and the terminal device restarts When trying to access the cell of one of the second network devices, and when the second timer of the second network device's cell times out, the terminal device chooses to initiate to the cell of another second network device whose second timer has not expired Access process.
  • the cell handover method provided by the exemplary embodiment of the present disclosure enables the target base station to reasonably maintain the resources allocated to the terminal device for conditional handover through the handover request and handover command configuration for conditional handover and the handover execution mode, so that the terminal The device can access the target cell with effective resources when performing conditional handover.
  • the cell handover procedure in this example may include operations 601-607.
  • the source base station and the target base station in this example correspond to the aforementioned first network device and second network device, respectively.
  • the source base station receives the measurement report reported by the terminal device.
  • the source base station may initiate the handover process based on the measurement report reported by the terminal, however, this disclosure is not limited to this. In other implementations, the source base station may not initiate the handover process based on the measurement report.
  • the source base station may initiate the handover process to switch the terminal device to the target cell when the load of its cell exceeds a certain threshold, or, The source base station can pre-select the target cell according to the movement track of the terminal to initiate the handover process.
  • the source base station sends a handover request to the target base station.
  • the switching request may include at least one of conditional switching indication information and duration suggestion information for the first timer.
  • the target base station after receiving the handover request, the target base station generates a handover command.
  • the target base station may configure the duration of the first timer according to at least one of the conditional switching indication information in the switching request and the duration suggestion information for the first timer.
  • the switching command includes the duration of the first timer.
  • the target base station sends a handover command to the source base station through a handover request confirmation message.
  • the source base station sends to the terminal device a handover command of the target base station and a condition set by the source base station for the terminal device to initiate handover to the target base station through an RRC reconfiguration message.
  • the switching command includes the duration of the first timer.
  • the terminal device sends an RRC reconfiguration complete message to the source base station.
  • the terminal device initiates random access to the target cell.
  • the cell handover procedure in this example may include operations 701-708.
  • the source base station and the target base station in this example correspond to the aforementioned first network device and second network device, respectively.
  • the source base station receives the measurement report reported by the terminal device.
  • the source base station may initiate the handover process based on the measurement report reported by the terminal, however, this disclosure is not limited to this. In other implementations, the source base station may not initiate the handover process based on the measurement report.
  • the source base station may initiate the handover process to switch the terminal device to the target cell when the load of its cell exceeds a certain threshold, or, The source base station can pre-select the target cell according to the movement track of the terminal to initiate the handover process.
  • the source base station sends a handover request to the target base station.
  • the handover request may include at least one of conditional handover indication information and duration suggestion information for the first timer.
  • the target base station after receiving the handover request, the target base station generates a handover command.
  • the target base station may configure the duration of the first timer according to at least one of the conditional switching indication information in the switching request and the duration suggestion information for the first timer.
  • the target base station may also configure a second timer for some resources used to access the target cell.
  • the target base station may configure a second timer for dedicated RACH resources (such as a dedicated preamble) used to access the target cell.
  • the switching command may include the duration of the first timer and the second timer.
  • the target base station sends a handover command to the source base station through a handover request confirmation message.
  • the source base station sends to the terminal device a handover command of the target base station and a condition set by the source base station for the terminal device to initiate handover to the target base station through an RRC reconfiguration message.
  • the switching command may include the duration of the first timer and the second timer.
  • the terminal device sends an RRC reconfiguration complete message to the source base station.
  • the terminal device uses the dedicated RACH resource to initiate non-competition to the target cell Random access.
  • the terminal device uses the common RACH resource to initiate a competitive random access to the target cell .
  • the terminal device may perform only one of the operations.
  • Fig. 8 is a schematic diagram of an exemplary application scenario of the present disclosure. As shown in FIG. 8, the terminal device moves in the direction of the arrow, and there are multiple cells in the moving direction of the terminal device.
  • the source base station and the target base station in this exemplary application scenario correspond to the foregoing first network device and second network device, respectively.
  • the source base station 800 can estimate the running trajectory of the terminal device based on the position movement and time of the terminal device. For example, if the terminal device moves along a highway at a constant speed, the source base station 800 can move to multiple locations in front of the running trajectory of the terminal device.
  • the target cell sends a handover request.
  • the source base station 800 may send a handover request to the target base stations 801-806 respectively, and the handover request may include the time length recommendation information of the first timer for the target cell.
  • the suggested duration information may include the duration of the first timer suggested by the source base station and/or the estimated duration required for the terminal device to reach the target cell, so that the target base station can set the first timer of the target cell based on the suggested duration information.
  • the duration of a timer may include multiple target base stations.
  • multiple target base stations may configure different first timer durations based on the duration recommendation information of the source base station 800.
  • the target base station may further set a second timer, and the relevant details will not be repeated here.
  • the source base station 800 may also send the updated duration suggestion information to each target base station according to the position where the terminal device moves, so as to prevent the target base station from reserving resources for the terminal device for too long.
  • the source base station 800 may periodically or aperiodically send the above-mentioned updated duration suggestion information through a handover request.
  • Fig. 9 is a schematic diagram of another exemplary application scenario of the present disclosure.
  • the source base station and the target base station in this exemplary application scenario correspond to the foregoing first network device and second network device, respectively.
  • the terminal device moves back and forth within a certain range.
  • the source base station 900 may send a handover request to multiple target cells (for example, target base stations 901-906) around the terminal device, and the handover request may include the time length recommendation information of the first timer for the target cell.
  • the suggested duration information may include the duration of the first timer suggested by the source base station and/or the estimated duration required for the terminal device to reach the target cell, so that the target base station can set the first timer of the target cell based on the suggested duration information.
  • the duration of a timer may configure the same first timer duration based on the duration recommendation information of the source base station 900.
  • the target base station may further set a second timer, and the relevant details will not be repeated here.
  • the source base station 900 may also send the updated duration suggestion information to each target base station according to the position where the terminal device moves, so as to prevent the target base station from reserving resources for the terminal device for too long.
  • the source base station 900 may periodically or non-periodically send the updated duration suggestion information through a handover request.
  • the network device 1000 may include a sending unit 1010 and a receiving unit 1020.
  • the sending unit 1010 is configured to send a handover request to the second network device, where the handover request includes at least one of the following: conditional handover indication information, and duration suggestion information for the first timer.
  • the receiving unit 1020 is configured to receive a handover command sent by the second network device, where the handover command includes configuration information for handover and the duration of the first timer, and the first timer is used for controlling The valid time of the configuration information in the switching command.
  • the sending unit 1010 is further configured to send the switching command and the conditions set by the network device 1000 for the terminal device to initiate switching to the second network device to the terminal device.
  • conditional switching indication information is used to indicate that the switching request is for conditional switching.
  • the recommended duration information for the first timer includes at least one of the following: the recommended duration of the first timer, the estimated terminal device’s arrival at the cell of the second network device It takes time.
  • the network device 1000 further includes: a processing unit 1030 configured to determine the recommended duration information for the first timer according to at least one of the following: the moving speed of the terminal device, The moving direction of the terminal device and the signal quality of the serving cell currently reported by the terminal device.
  • a processing unit 1030 configured to determine the recommended duration information for the first timer according to at least one of the following: the moving speed of the terminal device, The moving direction of the terminal device and the signal quality of the serving cell currently reported by the terminal device.
  • the sending unit 1010 is further configured to send the updated duration recommendation information for the first timer to the second network device.
  • the handover command further includes: the duration of a second timer configured for part of the resources of the cell used to access the second network device.
  • the partial resources used to access the cell of the second network device include: dedicated random access channel RACH resources.
  • the dedicated RACH resource includes a dedicated preamble.
  • the sending unit 1010 is configured to: send the handover request to at least one second network device in the moving direction of the terminal device; or to at least one second network device around the network device The network device sends the handover request.
  • the foregoing embodiment of the network device 1000 may correspond to the method embodiment related to the first network device in the present disclosure, and the foregoing and other operations and/or functions of each unit in the network device 1000 may be the first The corresponding procedures of the network device-related method embodiments and examples are not repeated here for the sake of brevity.
  • the network device 1100 may include a receiving unit 1110, a processing unit 1120, and a sending unit 1130.
  • the receiving unit 1110 is configured to receive a handover request sent by a first network device, where the handover request includes at least one of the following: conditional handover indication information, and duration suggestion information for the first timer;
  • the processing unit 1120 is configured to configure the duration of the first timer according to at least one of the condition switching instruction information and the duration suggestion information for the first timer;
  • the sending unit 1120 is configured to send a handover command to the first network device, where the handover command includes configuration information for handover and the duration of the first timer, and the first timer is used to control all The effective time of the configuration information in the switch command.
  • conditional switching indication information is used to indicate that the switching request is for conditional switching.
  • the recommended duration information for the first timer includes at least one of the following: a recommended duration of the first timer, and an estimated duration required for the terminal device to reach the cell of the network device .
  • the processing unit 1120 is configured to:
  • the switching request includes the conditional switching indication information, determine according to the conditional switching indication information that the switching request is for conditional switching, and configure the duration of the first timer for conditional switching;
  • the handover request includes the duration suggestion information for the first timer, configure the duration of the first timer according to the duration suggestion information for the first timer;
  • the switching request includes the conditional switching indication information and the time length recommendation information for the first timer
  • it is determined according to the conditional switching indication information that the switching request is for conditional switching, and according to the target
  • the time length suggestion information of the first timer configures the time length of the first timer.
  • the receiving unit 1110 is further configured to receive the updated duration recommendation information for the first timer sent by the first network device.
  • the processing unit 1120 is further configured to configure a second timer for part of the resources of the cell used to access the network device.
  • the handover command sent by the sending unit 1130 to the first network device further includes the duration of the second timer.
  • the part of the resources used to access the cell of the network device includes a dedicated random access channel RACH resource.
  • the dedicated RACH resource includes a dedicated preamble.
  • the foregoing embodiment of the network device 1100 may correspond to the method embodiment related to the second network device in the present disclosure, and the foregoing and other operations and/or functions of each unit in the network device 1100 may be the second The corresponding procedures of the network device-related method embodiments and examples are not repeated here for the sake of brevity.
  • the terminal device 1200 may include a sending unit 1210 and a processing unit 1220.
  • the receiving unit 1220 is configured to receive a switching command sent by a first network device and a condition for the terminal device 1200 set by the first network device to initiate switching to a second network device, and the switching command includes Switching configuration information and the duration of a first timer, where the first timer is used to control the valid time of the configuration information in the switching command;
  • the processing unit 1220 is configured to start the first timer when the handover command is received, and initiate when the first timer has not expired and the conditions for initiating handover to the second network device are met. The process of accessing the cell of the second network device.
  • the handover command further includes: the duration of a second timer configured for part of the resources of the cell used to access the second network device.
  • the processing unit 1220 is further configured to start the second timer when the receiving unit 1210 receives the switching command.
  • the partial resources used to access the cell of the second network device include: dedicated random access channel RACH resources.
  • the dedicated RACH resource includes a dedicated preamble.
  • the processing unit 1220 is configured to:
  • the processing unit 1220 is further configured to: when the first timer has not expired, the terminal device 1200 retry to access the cell of the second network device, and the second network device When the timer has expired, use the common RACH resource to initiate random access to the cell.
  • the processing unit 1220 is further configured to: when the first timer has not expired and there are multiple cells of the second network device that meet the condition for initiating handover, select the second The cell of the second network device whose timer has not expired initiates an access procedure.
  • the processing unit 1220 is further configured to: when the first timer has not expired and there are multiple cells of the second network device that meet the conditions for initiating handover, and the terminal device 1200 retryes to access one of them When the cell of the second network device is the cell of the second network device, when the second timer of the cell of the second network device expires, selecting to initiate an access process to the cell of another second network device whose second timer has not timed out.
  • the foregoing embodiment of the terminal device 1200 may correspond to the method embodiment related to the terminal device in the present disclosure, and the foregoing and other operations and/or functions of each unit in the terminal device 1200 may be related to the terminal device.
  • the foregoing and other operations and/or functions of each unit in the terminal device 1200 may be related to the terminal device.
  • relevant details are not repeated here.
  • An exemplary embodiment of the present disclosure provides a network device including a memory, a processor, and a computer program stored in the memory and capable of running on the processor.
  • the processor implements the computer program when the computer program is executed. The operation performed by the first network device or the second network device in the disclosure.
  • the network device 1300 may include: a processor 1310, a memory 1320, and a transceiver 1330.
  • the processor 1310, the memory 1320, and the transceiver 1330 are connected by a bus system, and the memory 1320 is used to store instructions, and the processor 1310 is used to execute instructions stored in the memory 1320 to control the transceiver 1330 to send signals.
  • the operations of the sending unit and the receiving unit in the aforementioned network device may be executed by the transceiver under the control of the processor, and the operations of the processing unit may be executed by the processor.
  • the processor 1310 may be a central processing unit (Central Processing Unit, referred to as "CPU"), and the processor 1310 may also be other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), ready-made Programmable gate array (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc.
  • the general-purpose processor may be a microprocessor or the processor may also be any conventional processor or the like.
  • the memory 1320 may include a read-only memory and a random access memory, and provides instructions and data to the processor 1310. A part of the memory 1320 may also include a non-volatile random access memory. For example, the memory 1320 may also store device type information.
  • the bus system 1330 may also include a power bus, a control bus, and a status signal bus. However, for clarity of description, various buses are marked as the bus system 1330 in FIG. 13.
  • the processing performed by the network device may be completed by an integrated logic circuit of hardware in the processor 1330 or instructions in the form of software. That is, the operation of the method disclosed in the embodiments of the present disclosure may be embodied as being executed by a hardware processor, or executed by a combination of hardware and software modules in the processor.
  • the software module can be located in storage media such as random access memory, flash memory, read-only memory, programmable read-only memory, or electrically erasable programmable memory, registers.
  • the storage medium is located in the memory 1320, and the processor 1310 reads the information in the memory 1320, and completes the foregoing operations in combination with its hardware. To avoid repetition, it will not be described in detail here.
  • a terminal is also provided.
  • the terminal may include a processor, a memory, and a computer program stored on the memory and capable of running on the processor, and the processor implements the operations performed by the terminal device in the present disclosure when the computer program is executed.
  • the terminal 1400 may include: a processor 1410, a memory 1420, a bus system 1430, and a transceiver 1440, where the processor 1410, the memory 1420, and the transceiver 1440 pass through the bus system 1430 is connected, the memory 1420 is used to store instructions, and the processor 1410 is used to execute the instructions stored in the memory 1420 to control the transceiver 1440 to send signals.
  • the operation of the receiving unit in the aforementioned terminal device may be executed by the transceiver under the control of the processor, and the operation of the processing unit may be executed by the processor.
  • the processor 1410 may be a central processing unit (Central Processing Unit, referred to as "CPU"), and the processor 1410 may also be other general-purpose processors, digital signal processors (DSP), application specific integrated circuits (ASIC), and ready-made Programmable gate array (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc.
  • the general-purpose processor may be a microprocessor or the processor may also be any conventional processor or the like.
  • the memory 1420 may include a read-only memory and a random access memory, and provides instructions and data to the processor 1410. A part of the memory 1420 may also include a non-volatile random access memory. For example, the memory 1420 may also store device type information.
  • the bus system 1430 may also include a power bus, a control bus, and a status signal bus. However, for the sake of clear description, various buses are marked as the bus system 1430 in FIG. 14.
  • the processing performed by the terminal device can be completed by an integrated logic circuit of hardware in the processor 1410 or instructions in the form of software. That is, the steps of the method disclosed in the embodiments of the present disclosure may be embodied as being executed by a hardware processor, or executed by a combination of hardware and software modules in the processor.
  • the software module can be located in storage media such as random access memory, flash memory, read-only memory, programmable read-only memory, or electrically erasable programmable memory, registers.
  • the storage medium is located in the memory 1420, and the processor 1410 reads the information in the memory 1420, and completes the steps of the foregoing method in combination with its hardware. To avoid repetition, it will not be described in detail here.
  • An exemplary embodiment of the present disclosure further provides a computer-readable storage medium on which a computer program is stored, and when the computer program is executed by a processor, the processing of any method described in the foregoing embodiments of the present disclosure is realized.
  • Such software may be distributed on a computer-readable medium
  • the computer-readable medium may include a computer storage medium (or non-transitory medium) and a communication medium (or transitory medium).
  • the term computer storage medium includes volatile and non-volatile memory implemented in any method or technology for storing information (such as computer-readable instructions, data structures, program modules, or other data).
  • Computer storage media include but are not limited to RAM, ROM, EEPROM, flash memory or other memory technology, CD-ROM, digital versatile disk (DVD) or other optical disk storage, magnetic cassette, tape, magnetic disk storage or other magnetic storage device, or Any other medium used to store desired information and that can be accessed by a computer.
  • communication media usually contain computer-readable instructions, data structures, program modules, or other data in a modulated data signal such as carrier waves or other transmission mechanisms, and may include any information delivery media .
  • the specification may have presented the method and/or process as a specific sequence of steps. However, to the extent that the method or process does not depend on the specific order of the steps described herein, the method or process should not be limited to the steps in the specific order described. As those of ordinary skill in the art will understand, other sequence of steps are also possible. Therefore, the specific order of steps set forth in the specification should not be construed as a limitation on the claims. In addition, the claims for the method and/or process should not be limited to performing their steps in the written order. Those skilled in the art can easily understand that these orders can be changed and still remain within the spirit and scope of the embodiments of the present disclosure. Inside.

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Abstract

本公开提供了一种小区切换方法、装置、网络设备、终端设备及存储介质。小区切换方法包括：第一网络设备向第二网络设备发送切换请求，所述切换请求中包括以下至少一项：条件切换指示信息、针对第一定时器的时长建议信息；所述第一网络设备接收所述第二网络设备发送的切换命令，所述切换命令中包括用于切换的配置信息以及所述第一定时器的时长，所述第一定时器用于控制所述切换命令中的所述配置信息的有效时间；所述第一网络设备向终端设备发送所述切换命令、以及所述第一网络设备设置的所述终端设备向所述第二网络设备发起切换的条件。

Description

小区切换方法、装置、网络设备、终端设备及存储介质 技术领域
本申请涉及但不限于通信领域，尤指一种小区切换方法、装置、网络设备、终端设备及存储介质。
背景技术
在无线通信的小区切换过程中，通常终端设备在收到源基站转发的来自目标基站的切换命令后立即启动切换定时器(例如T304或T307)并向目标小区进行接入。相应地，目标基站在响应源基站的切换请求后也是按照立即切换的流程配置和管理分配给终端设备的用于接入目标小区的资源。然而，上述立即切换的流程用于条件切换(CHO，Conditional Handover)时，很可能发生终端设备无法发起向目标小区的切换的情况，因而并不适合应用于条件切换。
发明概述
以下是对本文详细描述的主题的概述。本概述并非是为了限制权利要求的保护范围。
第一方面，本公开实施例提供了一种小区切换方法，包括：
第一网络设备向第二网络设备发送切换请求，所述切换请求中包括以下至少一项：条件切换指示信息、针对第一定时器的时长建议信息；
所述第一网络设备接收所述第二网络设备发送的切换命令，所述切换命令中包括用于切换的配置信息以及所述第一定时器的时长，所述第一定时器用于控制所述切换命令中的所述配置信息的有效时间；
所述第一网络设备向终端设备发送所述切换命令、以及所述第一网络设备设置的所述终端设备向所述第二网络设备发起切换的条件。
第二方面，本公开实施例提供了一种小区切换方法，包括：
第二网络设备接收第一网络设备发送的切换请求，所述切换请求中包括以下至少一项：条件切换指示信息、针对第一定时器的时长建议信息；
所述第二网络设备根据所述条件切换指示信息和所述针对第一定时器的时长建议信息中的至少一项，配置所述第一定时器的时长；
所述第二网络设备向所述第一网络设备发送切换命令，所述切换命令中包括用于切换的配置信息以及所述第一定时器的时长，所述第一定时器用于控制所述切换命令中的所述配置信息的有效时间。
第三方面，本公开实施例提供了一种小区切换方法，包括：
终端设备接收第一网络设备发送的切换命令以及所述第一网络设备设置的所述终端设备向第二网络设备发起切换的条件，所述切换命令中包括用于切换的配置信息以及第一定时器的时长，所述第一定时器用于控制所述切换命令中的所述配置信息的有效时间；
所述终端设备在收到所述切换命令时启动所述第一定时器；
在所述第一定时器未超时且所述向第二网络设备发起切换的条件满足时，所述终端设备发起接入所述第二网络设备的小区的过程。
第四方面，本公开实施例提供了一种网络设备，包括：
发送单元，配置为向第二网络设备发送切换请求，所述切换请求中包括以下至少一项：条件切换指示信息、针对第一定时器的时长建议信息；
接收单元，配置为接收所述第二网络设备发送的切换命令，所述切换命令中包括用于切换的配置信息以及所述第一定时器的时长，所述第一定时器用于控制所述切换命令中的所述配置信息的有效时间；
其中，所述发送单元还配置为向终端设备发送所述切换命令、以及所述网络设备设置的所述终端设备向所述第二网络设备发起切换的条件。
第五方面，本公开实施例提供了一种网络设备，包括：
接收单元，配置为接收第一网络设备发送的切换请求，所述切换请求中包括以下至少一项：条件切换指示信息、针对第一定时器的时长建议信息；
处理单元，配置为根据所述条件切换指示信息和所述针对第一定时器的时长建议信息中的至少一项，配置所述第一定时器的时长；
发送单元，配置为向所述第一网络设备发送切换命令，所述切换命令中包括用于切换的配置信息以及所述第一定时器的时长，所述第一定时器用于控制所述切换命令中的所述配置信息的有效时间。
第六方面，本公开实施例提供了一种终端设备，包括：
接收单元，配置为接收第一网络设备发送的切换命令、以及所述第一网络设备设置的所述终端设备向第二网络设备发起切换的条件，所述切换命令中包括用于切换的配置信息以及第一定时器的时长，所述第一定时器用于控制所述切换命令中的所述配置信息的有效时间；
处理单元，配置为在收到所述切换命令时启动所述第一定时器，以及在所述第一定时器未超时且所述向第二网络设备发起切换的条件满足时，发起接入所述第二网络设备的小区的过程。
第七方面，本公开实施例提供了一种网络设备，包括存储器、处理器及存储在所述存储器上并可在所述处理器上运行的计算机程序，所述处理器执行所述计算机程序时实现第一方面所述的小区切换方法。
第八方面，本公开实施例提供了一种网络设备，包括存储器、处理器及存储在所述存储器上并可在所述处理器上运行的计算机程序，所述处理器执行所述计算机程序时实现第二方面所述的小区切换方法。
第九方面，本公开实施例提供了一种终端设备，包括存储器、处理器及存储在所述存储器上并可在所述处理器上运行的计算机程序，所述处理器执行所述计算机程序时实现第三方面所述的小区切换方法。
第十方面，本公开实施例提供了一种计算机可读存储介质，其上存储有计算机程序，所述计算机程序被处理器执行时实现第一方面所述的小区切换方法。
第十一方面，本公开实施例提供了一种计算机可读存储介质，其上存储有计算机程序，所述计算机程序被处理器执行时实现第二方面所述的小区切换方法。
第十二方面，本公开实施例提供了一种计算机可读存储介质，其上存储有计算机程序，所述计算机程序被处理器执行时实现第三方面所述的小区切换方法。
在阅读并理解了附图和详细描述后，可以明白其他方面。
附图概述
图1为本公开示例性实施例的一应用场景示意图；
图2为一种小区切换流程的示意图；
图3为本公开一示例性实施例的小区切换方法的流程图；
图4为本公开另一示例性实施例的小区切换方法的流程图；
图5为本公开再一示例性实施例的小区切换方法的流程图；
图6为本公开一示例中的小区切换方法的流程图；
图7为本公开另一示例中的小区切换方法的流程图；
图8为本公开一示例性应用场景示意图；
图9为本公开另一示例性应用场景示意图；
图10为本公开一示例性实施例的网络设备的逻辑结构示意图；
图11为本公开另一示例性实施例的网络设备的逻辑结构示意图；
图12为本公开一示例性实施例的终端设备的逻辑结构示意图；
图13为本公开一示例性实施例的网络设备的硬件结构示意图；
图14为本公开一示例性实施例的终端设备的硬件结构示意图。
详述
下面将结合本公开实施例中的附图，对本公开实施例中的技术方案进行阐述，显然，所描述的实施例是本公开的一部分实施例，而不是全部实施例。基于本公开中的实施例，本领域普通技术人员在没有付出创造性劳动的前提下所获得的所有其他实施例，都应属于本公开的保护范围。
图1为本公开示例性实施例的一个应用场景的示意图。如图1所示，通信系统可以包括终端100和至少两个网络设备120、140。终端设备100可以通过空口与网络设备通信。例如，当终端设备100位于网络设备120的小区中时，可以与网络设备120进行信息交互，当终端设备100从网络设备120的小区移动到网络设备140的小区的过程中，将发生切换，之后终端设备100可以与网络设备140进行信息交互。网络设备之间、例如网络设备120和140之间可以相互通信。
应理解，图1所示的通信系统仅仅是一个示例，本公开实施例不限定于此。本公开实施例的技术方案可以应用于各种通信系统，例如：长期演进(Long Term Evolution，LTE)系统、LTE时分双工(Time Division Duplex，TDD)、通用移动通信系统(Universal Mobile Telecommunication System，UMTS)、5G新空口(New Radio NR)通信系统等。
其中，网络设备120和140可以是LTE中的演进型基站(Evolutional Node B，eNB或eNodeB)、5G网络中的基站设备、或者未来通信系统中的基站等。
其中，终端100可以经无线接入网(Radio Access Network，RAN)与一个或多个核心网(Core Network)进行通信，也可称为接入终端、用户设备(User Equipment，UE)、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。例如，终端100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、个人数字处理(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、或者5G网络中的终端设备等。
图2为一种小区切换流程的示意图。如图2所示，小区切换(Handover)的主要流程可以包括三个阶段：切换准备阶段、切换执行阶段以及切换完成阶段。其中，源基站为终端设备当前所在小区的基站，目标基站为终端设备切换至的目标小区的基站。
如图2所示，在切换准备阶段，源基站可以配置终端设备进行测量上报，并基于终端设备上报的测量报告向目标基站发送切换请求。当目标基站同意切换请求后，目标基站为终端设备配置切换命令(handover command)，其 中包括专用随机接入信道(RACH，Random Access Channel)资源、小区无线网络临时标识(C-RNTI，Cell Radio Network Temporary Identifier)、目标基站安全算法以及目标基站的系统消息(系统消息中包括公共RACH资源)等。其中，专用RACH资源可以包括用于非竞争随机接入(contention-free random access)的专用前导码(preamble)，公共RACH资源即为用于竞争随机接入(contention-based random access)的RACH资源。
如图2所示，在切换执行阶段，源基站可以通过无线资源控制(Radio Resource Control,RRC)消息(例如RRC连接重配置消息或RRC重配置消息)将切换命令转发给终端设备，终端设备收到切换命令后，可以向目标基站发起随机接入流程。同时，源基站发送序列号(SN，Sequence Number)状态(Status)给目标基站，用于告知目标基站上行分组数据汇聚协议(PDCP，Packet Data Convergence Protocol)SN接收状态以及下行PDCP SN发送状态。
如图2所示，在切换完成阶段，当终端设备成功接入目标基站后(随机接入成功)，目标基站发送路径切换请求(Path Switch Request)给移动管理实体(MME，Mobility Management Entity)，请求MME切换下行路径；MME发送承载修改请求(Modify Bearer Request)给服务网关(Serving Gateway，SGW)进行下行路径切换；路径切换完成后，目标基站指示源基站释放终端设备上下文，从而完成小区切换。
切换过程中可以使用定时器。切换过程中可以使用的定时器的示例如下面表1所示。
表1 切换过程中可以使用的定时器的示例
Figure PCTCN2019078363-appb-000001
Figure PCTCN2019078363-appb-000002
其中，定时器T312和T310的时长可以由源基站配置，定时器T304和T307的时长可以由目标基站配置。
其中，定时器T312在测量报告发送时启动，若该定时器超时，则终端设备回到空闲态(IDLE)或者发起连接重建过程。定时器T312存在的前提是定时器T310在运行中，当终端设备收到物理层上报的连续多个out-of-sync指示后启动定时器T310，但是由于定时器T310的时长较大，无法避免切换过晚(handover too late)(例如，一直收不到切换命令)的问题，所以引入定时器T312来避免切换过晚的情况。当UE收到切换命令时，定时器T310和T312都会停止。
其中，定时器T304和T307都是在终端设备收到切换命令时启动的，用于控制所配置的RACH资源的有效时间以及限制终端设备接入目标基站或辅站点(Secondary Node，SN)的时间。
对于某些特殊场景，例如终端设备高速移动或者高频段(例如6GHz以上频段)部署条件下，终端设备需要频繁地进行小区切换。可以通过条件切换(Conditional handover)给终端设备提前配置切换命令。比如，在高铁场景下，终端设备的运行轨迹是特定的，因此，源基站可以提前为终端设备配置目标基站，并且向终端设备发送用于触发该终端设备进行切换的条件。所述切换条件可以在所述源基站通过RRC消息转发切换命令时发送给所述终端设备。当满足所述切换条件时，所述终端设备可以向所述目标基站发起接入请求。
用于触发终端设备进行切换的条件可以基于所述终端设备的接收信号和/或所述终端设备的地理位置来设置。例如，所述切换条件可以基于以下中的一项或多项来设置：目标小区的信号强度(例如，目标小区的参考信号接收功率(Reference Signal Received Power,RSRP))、目标小区的信号质量(例如，目标小区的参考信号接收质量(Reference Signal Received Quality,RSRQ))、目标小区的信噪比(Signal Noise Ratio,SNR)、目标小区的信号与源小区的信号相比的情况、所述终端设备的绝对地理位置、所述终端设备与源基站的距离。例如，用于触发终端设备进行切换的条件可以包括：目 标小区的信号强度大于某一阈值，或者可以包括：目标小区的信号强度高于终端当前所在小区的信号强度一定的偏移量，或者可以包括：所述终端设备到达源小区的边界区域或者与源基站的距离大于某一阈值。本公开对此并不限定。应理解，目标小区是指目标基站的小区，源小区是指源基站的小区。
现有常规的切换流程中，当终端设备收到源基站转发的目标基站的切换命令后立即启动切换定时器(例如定时器T304或T307)并向目标小区发起接入流程。目标基站在响应源基站的切换请求后也是按照立即切换的流程，配置和管理分配给终端设备的用于接入目标小区的资源。然而，对于条件切换，终端设备收到切换命令后并不会立即执行切换，而是在满足切换条件时才执行切换。这种情况下，如果目标基站仍然按照立即切换流程去配置和管理分配给终端设备的用于接入目标小区的资源以及设置切换定时器的时长，那么当切换条件触发时，切换定时器很可能已经超时，导致终端设备无法发起向目标小区的切换。
本公开示例性实施例提供一种小区切换方法，通过用于条件切换的切换请求和切换命令配置以及切换执行方式，使得目标基站能够合理地维护分配给终端设备的用于条件切换的资源，从而终端设备在进行条件切换时能够在有效的资源下向目标小区进行接入。
本公开一示例性实施例提供一种小区切换方法，如图3所示，该方法可以包括操作301-303。
在301中，第一网络设备向第二网络设备发送切换请求，所述切换请求中包括以下至少一项：条件切换指示信息、针对第一定时器的时长建议信息。
在一示例性实施例中，所述第一网络设备可以是小区切换中的源基站，所述第二网络设备可以是小区切换中的目标基站。
在一示例性实施例中，所述条件切换指示信息可以用于指示所述切换请求是用于条件切换。所述针对第一定时器的时长建议信息可以包括以下至少一项：建议的第一定时器的时长、估计的所述终端设备到达所述第二网络设备的小区所需时长。所述条件切换指示信息和/或所述针对第一定时器的时长建议信息用于所述第二网络设备针对条件切换设置合理的第一定时器的时长。例如，根据来自第一网络设备的条件切换指示信息和/或针对第一定时器的时长建议信息，第二网络设备可以配置较长的第一定时器的长度，从而使得终端设备在切换条件满足需要向第二网络设备的小区发起切换时，第一定时器很可能尚未超时，从而提高终端设备发起切换的成功率。第一定时器可以是切换定时器T304或T307。
在一示例性实施例中，所述第一网络设备可以根据以下中的至少一项确定所述针对第一定时器的时长建议信息：所述终端设备的移动速度、所述终端设备的移动方向、所述终端设备当前上报的服务小区信号质量。例如，第 一网络设备根据所述终端设备的移动速度、移动方向、和/或当前上报的服务小区信号质量，可以判断所述终端设备的移动情况，从而可以生成建议的第一定时器的时长和/或估计出所述终端设备到达所述第二网络设备的小区所需时长，并作为针对第一定时器的时长建议信息发送给第二网络设备。
在一示例性实施例中，所述方法还可包括：所述第一网络设备向所述第二网络设备发送更新的所述针对第一定时器的时长建议信息。例如，在所述第一网络设备通过所述切换请求向所述第二网络设备发送所述针对第一定时器的时长建议信息后，所述第一网络设备可以根据终端设备移动的位置每隔一段时间或者不定时地向所述第二网络设备发送更新的所述针对第一定时器的时长建议信息，从而避免所述第二网络设备为所述终端设备预留切换资源的时间过长。所述第一网络设备可以通过切换请求或其它消息发送所述更新的针对第一定时器的时长建议信息。
在一示例性实施例中，所述第一网络设备向所述第二网络设备发送所述切换请求可包括：所述第一网络设备向所述终端设备的移动方向上的至少一个第二网络设备发送所述切换请求；或者所述第一网络设备向所述第一网络设备周围的至少一个第二网络设备发送所述切换请求。示例性的场景如图8、图9所示。
在302中，所述第一网络设备接收所述第二网络设备发送的切换命令，所述切换命令中包括用于切换的配置信息以及所述第一定时器的时长，所述第一定时器用于控制所述切换命令中的所述配置信息的有效时间。
在一示例性实施例中，所述切换命令中的用于切换的配置信息可以包括以下至少一项：专用RACH资源、C-RNTI、第二网络设备的安全算法、第二网络设备的系统消息。其中，所述专用RACH资源可以包括用于非竞争随机接入的专用前导码，系统消息中可以包括公共RACH资源，公共RACH资源为用于竞争随机接入的RACH资源。所述第一定时器用于控制所述切换命令中的所述配置信息的有效时间。例如，当所述第一定时器超时时，所述切换命令中的所述配置信息失效，终端设备将无法按照该配置信息向所述第二网络设备发起切换。
在一示例性实施例中，所述切换命令中还可包括：针对用于接入所述第二网络设备的小区的部分资源配置的第二定时器的时长。该第二定时器用于控制所述用于接入所述第二网络设备的小区的部分资源的有效时间。所述用于接入所述第二网络设备的小区的部分资源可包括：专用RACH资源。所述专用RACH资源可包括专用前导码。例如，所述第二网络设备可以针对切换命令中的部分配置信息设置单独的定时器，比如针对专用RACH资源中的专用前导码配置一个单独的第二定时器。该第二定时器的时长可以短于所述第一定时器的时长，从而避免较长时间地保留专用RACH资源。针对专用RACH资源引入第二定时器将有助于第二网络设备对专用RACH资源的管理，能优 化专用RACH资源在本小区的使用，例如在第二定时器超时时，可以将相应的专用RACH资源重新分配给小区内的其它终端设备。但本公开对此并不限定。
在303中，所述第一网络设备向终端设备发送所述切换命令、以及所述第一网络设备设置的所述终端设备向所述第二网络设备发起切换的条件。
在一示例性实施例中，所述第一网络设备可以通过RRC消息(例如RRC连接重配置消息或RRC重配置消息)向终端设备发送所述切换命令，并且所述RRC消息中可以进一步包括所述第一网络设备设置的所述终端设备向所述第二网络设备发起切换的条件。所述第一网络设备可以基于所述终端设备的接收信号和/或所述终端设备的地理位置来设置所述终端设备向所述第二网络设备发起切换的条件。例如，所述切换条件可以基于以下中的一项或多项来设置：第二网络设备小区的信号强度(例如，第二网络设备小区的RSRP)、第二网络设备小区的信号质量(例如，第二网络设备小区的RSRQ)、第二网络设备小区的信噪比(SNR)、第二网络设备小区的信号与第一网络设备小区的信号相比的情况、所述终端设备的绝对地理位置、所述终端设备与第一网络设备的距离。例如，所述第一网络设备设置的所述终端设备向所述第二网络设备发起切换的条件可以包括：第二网络设备小区的信号强度大于某一阈值，或者可以包括：第二网络设备小区的信号强度高于第一网络设备小区的信号强度一定的偏移量，或者可以包括：所述终端设备到达第一网络设备小区的边界区域或者与第一网络设备的距离大于某一阈值。本公开对此不做具体限定。
本公开一示例性实施例提供一种小区切换方法，如图4所示，该方法可以包括操作401-403。
在401中，第二网络设备接收第一网络设备发送的切换请求，所述切换请求中包括以下至少一项：条件切换指示信息、针对第一定时器的时长建议信息。
在一示例性实施例中，所述第一网络设备可以是小区切换中的源基站，所述第二网络设备可以是小区切换中的目标基站。
在一示例性实施例中，所述条件切换指示信息可以用于指示所述切换请求是用于条件切换。所述针对第一定时器的时长建议信息可以包括以下至少一项：建议的第一定时器的时长、估计的所述终端设备到达所述第二网络设备的小区所需时长。
在一示例性实施例中，所述方法还可包括：所述第二网络设备接收所述第一网络设备发送的更新的所述针对第一定时器的时长建议信息。例如，所述第二网络设备周期地或非周期地接收所述第一网络设备发送的更新的针对第一定时器的时长建议信息。所述更新的针对第一定时器的时长建议信息可 以携带在切换请求或其它消息中。
在402中，所述第二网络设备根据所述条件切换指示信息和所述针对第一定时器的时长建议信息中的至少一项，配置所述第一定时器的时长。
在一示例性实施例中，所述第二网络设备根据所述条件切换指示信息和所述针对第一定时器的时长建议信息中的至少一项，配置所述第一定时器的时长，可包括：当所述切换请求中包括所述条件切换指示信息时，所述第二网络设备根据所述条件切换指示信息确定所述切换请求是用于条件切换，并配置用于条件切换的所述第一定时器的时长；当所述切换请求中包括所述针对第一定时器的时长建议信息时，所述第二网络设备根据所述针对第一定时器的时长建议信息，配置所述第一定时器的时长；当所述切换请求中包括所述条件切换指示信息以及所述针对第一定时器的时长建议信息时，所述第二网络设备根据所述条件切换指示信息确定所述切换请求是用于条件切换，并根据所述针对第一定时器的时长建议信息，配置所述第一定时器的时长。具体地，当第二网络设备配置第一定时器的时长时，可以直接采用第一网络设备建议的时长，或者基于第一网络设备建议的时长，独立配置第一定时器的时长。本公开对此并不限定。
例如，第二网络设备根据来自第一网络设备的条件切换指示信息和/或针对第一定时器的时长建议信息，可以配置适用于条件切换的合理的第一定时器的时长。例如第二网络设备可以设置较长的第一定时器的长度，从而使得终端设备在切换条件满足需要向第二网络设备的小区发起切换时，第一定时器很可能尚未超时，从而提高终端设备发起切换的成功率。第一定时器可以是切换定时器T304或T307。
在403中，所述第二网络设备向所述第一网络设备发送切换命令，所述切换命令中包括用于切换的配置信息以及所述第一定时器的时长，所述第一定时器用于控制所述切换命令中的所述配置信息的有效时间。
在一示例性实施例中，所述切换命令中的用于切换的配置信息可以包括以下至少一项：专用RACH资源、C-RNTI、第二网络设备的安全算法、第二网络设备的系统消息。其中，所述专用RACH资源可以包括用于非竞争随机接入的专用前导码，系统消息中可以包括公共RACH资源，公共RACH资源为用于竞争随机接入的RACH资源。所述第一定时器用于控制所述切换命令中的所述配置信息的有效时间。例如，当所述第一定时器超时时，所述切换命令中的所述配置信息失效，终端设备将无法按照该配置信息向所述第二网络设备发起切换。
在一示例性实施例中，所述方法还可包括：所述第二网络设备针对用于接入所述第二网络设备的小区的部分资源配置第二定时器；所述第二网络设备向所述第一网络设备发送的所述切换命令中还包括所述第二定时器的时长。 所述第二网络设备针对用于接入所述第二网络设备的小区的部分资源配置第二定时器可包括：所述第二网络设备针对专用RACH资源配置第二定时器。所述第二网络设备针对所述专用RACH资源配置第二定时器可包括：所述第二网络设备针对专用前导码配置第二定时器。
例如，所述第二网络设备可以针对切换命令中的部分配置信息设置单独的定时器，比如针对专用RACH资源中的专用前导码配置一个单独的第二定时器。该第二定时器的时长可以短于所述第一定时器的时长，从而避免较长时间地保留专用RACH资源。针对专用RACH资源引入第二定时器将有助于第二网络设备对专用RACH资源的管理，能优化专用RACH资源在本小区的使用，例如在第二定时器超时时，可以将相应的专用RACH资源重新分配给小区内的其它终端设备。但本公开对此并不限定。
本公开一示例性实施例提供一种小区切换方法，如图5所示，该方法可以包括操作501-503。
在501中，终端设备接收第一网络设备发送的切换命令、以及所述第一网络设备设置的所述终端设备向第二网络设备发起切换的条件，所述切换命令中包括用于切换的配置信息以及第一定时器的时长，所述第一定时器用于控制所述切换命令中的所述配置信息的有效时间。
在一示例性实施例中，所述第一网络设备可以是小区切换中的源基站，所述第二网络设备可以是小区切换中的目标基站。
在一示例性实施例中，所述切换命令中的用于切换的配置信息可以包括以下至少一项：专用RACH资源、C-RNTI、第二网络设备的安全算法、第二网络设备的系统消息。其中，所述专用RACH资源可以包括用于非竞争随机接入的专用前导码，系统消息中可以包括公共RACH资源，公共RACH资源为用于竞争随机接入的RACH资源。所述第一定时器用于控制所述切换命令中的所述配置信息的有效时间。例如，当所述第一定时器超时时，所述切换命令中的所述配置信息失效，所述终端设备将无法按照该配置信息向所述第二网络设备发起切换。
在一示例性实施例中，所述终端设备可以接收来自所述第一网络设备的RRC消息(例如RRC连接重配置消息或RRC重配置消息)，所述RRC消息中包括所述切换命令，并且所述RRC消息中可以进一步包括所述第一网络设备设置的所述终端设备向所述第二网络设备发起切换的条件。
在502中，所述终端设备在收到所述切换命令时启动所述第一定时器。
在503中，在所述第一定时器未超时且所述向第二网络设备发起切换的条件满足时，所述终端设备发起接入所述第二网络设备的小区的过程。
在一示例性实施例中，所述切换命令中还可包括：针对用于接入所述第二网络设备的小区的部分资源配置的第二定时器的时长；所述方法还可包括： 所述终端设备在收到所述切换命令时启动所述第二定时器。所述第二定时器用于控制所述用于接入所述第二网络设备的小区的部分资源的有效时间。所述用于接入所述第二网络设备的小区的部分资源可包括：专用随机接入信道RACH资源。所述专用RACH资源可包括专用前导码。
在一示例性实施例中，所述在所述第一定时器未超时且所述向第二网络设备发起切换的条件满足时，所述终端设备发起接入所述第二网络设备的小区的过程，可包括：当所述第一定时器未超时且所述向第二网络设备发起切换的条件满足、且所述第二定时器未超时时，所述终端设备使用所述专用RACH资源向所述第二网络设备的小区发起随机接入；当所述第一定时器未超时且所述向第二网络设备发起切换的条件满足、且所述第二定时器已超时时，所述终端设备使用公共RACH资源向所述第二网络设备的小区发起随机接入。
在一示例性实施例中，所述方法还可包括：当所述第一定时器未超时，所述终端设备重新尝试(re-attempt)接入所述第二网络设备的小区，且所述第二定时器已超时时，所述终端设备使用公共RACH资源向所述小区发起随机接入。例如，当终端设备尝试接入第二网络设备的小区失败时，如果第一定时器尚未超时，终端设备会重新尝试接入第二网络设备的小区，此时如果第二定时器已超时，则终端设备可以使用公共RACH资源向所述小区发起随机接入。
在一示例性实施例中，所述方法还可包括：当所述第一定时器未超时，且存在多个第二网络设备的小区满足所述发起切换的条件时，所述终端设备选择向第二定时器尚未超时的第二网络设备的小区发起接入过程。
在一示例性实施例中，所述方法还可包括：当所述第一定时器未超时，且存在多个第二网络设备的小区满足所述发起切换的条件，且在所述终端设备重新尝试接入其中一个第二网络设备的小区时，该第二网络设备的小区的第二定时器超时时，所述终端设备选择向第二定时器尚未超时的另一第二网络设备的小区发起接入过程。
本公开示例性实施例提供的小区切换方法，通过用于条件切换的切换请求和切换命令配置以及切换执行方式，使得目标基站能够合理地维护分配给终端设备的用于条件切换的资源，从而终端设备在进行条件切换时能够在有效的资源下向目标小区进行接入。
本公开提供的小区切换方法的一个示例如图6所示。该示例中的小区切换流程可包括操作601-607。该示例中的源基站和目标基站分别对应于上述第一网络设备和第二网络设备。
在601中，源基站接收终端设备上报的测量报告。在本示例中，源基站可以基于终端上报的测量报告来发起切换过程，然而，本公开对此并不限定。 在其他实现方式中，源基站可以不基于测量报告来发起切换过程，比如，源基站可以在其小区的负荷超过某一阈值时，发起切换过程以将所述终端设备切换至目标小区，或者，源基站可以根据终端的移动轨迹预先选定目标小区，发起切换过程。
在602中，源基站向目标基站发送切换请求。切换请求中可以包括条件切换指示信息和针对第一定时器的时长建议信息中的至少一项。
在603中，目标基站收到切换请求后，生成切换命令。其中，目标基站可以根据切换请求中的条件切换指示信息和针对第一定时器的时长建议信息中的至少一项，配置第一定时器的时长。所述切换命令中包括所述第一定时器的时长。
在604中，目标基站通过切换请求确认消息将切换命令发送给源基站。
在605中，源基站通过RRC重配置消息向终端设备发送目标基站的切换命令以及源基站设置的终端设备向目标基站发起切换的条件。其中，所述切换命令中包括所述第一定时器的时长。
在606中，终端设备向源基站发送RRC重配置完成消息。
在607中，在所述第一定时器未超时且向目标基站发起切换的条件满足时，终端设备向目标小区发起随机接入。
本公开提供的小区切换方法的另一个示例如图7所示。该示例中的小区切换流程可以包括操作701-708。该示例中的源基站和目标基站分别对应于上述第一网络设备和第二网络设备。
在701中，源基站接收终端设备上报的测量报告。在本示例中，源基站可以基于终端上报的测量报告来发起切换过程，然而，本公开对此并不限定。在其他实现方式中，源基站可以不基于测量报告来发起切换过程，比如，源基站可以在其小区的负荷超过某一阈值时，发起切换过程以将所述终端设备切换至目标小区，或者，源基站可以根据终端的移动轨迹预先选定目标小区，发起切换过程。
在702中，源基站向目标基站发送切换请求。所述切换请求中可以包括条件切换指示信息和针对第一定时器的时长建议信息中的至少一项。
在703中，目标基站收到切换请求后，生成切换命令。其中，目标基站可以根据切换请求中的条件切换指示信息和针对第一定时器的时长建议信息中的至少一项，配置第一定时器的时长。进一步地，目标基站还可以针对用于接入目标小区的部分资源配置第二定时器，例如，目标基站可以针对用于接入目标小区的专用RACH资源(例如专用前导码)配置第二定时器。所述切换命令中可以包括所述第一定时器和第二定时器的时长。
在704中，目标基站通过切换请求确认消息将切换命令发送给源基站。
在705中，源基站通过RRC重配置消息向终端设备发送目标基站的切换命令以及源基站设置的终端设备向目标基站发起切换的条件。所述切换命令中可以包括所述第一定时器和第二定时器的时长。
在706中，终端设备向源基站发送RRC重配置完成消息。
在707中，当所述第一定时器未超时且向目标基站发起切换的条件满足、且所述第二定时器未超时时，所述终端设备使用所述专用RACH资源向目标小区发起非竞争随机接入。
在708中，当所述第一定时器未超时且向目标基站发起切换的条件满足、且所述第二定时器已超时时，所述终端设备使用公共RACH资源向目标小区发起竞争随机接入。
对于操作707和708，终端设备可以仅执行其中一个操作。
应理解，以上示例仅是为了便于理解本公开的技术方案所举的说明性示例，而并非用于限制本公开实施例的实现方式。
图8为本公开一示例性应用场景示意图。如图8所示，终端设备沿着箭头方向移动，且在终端设备的移动方向上存在多个小区。本示例性应用场景中的源基站和目标基站分别对应于上述第一网络设备和第二网络设备。
在本示例性应用场景中，源基站800可以基于终端设备的位置移动以及时间估计终端设备的运行轨迹，比如若终端设备沿高速公路匀速前进，源基站800可以向终端设备运行轨迹前方的多个目标小区发送切换请求。例如，源基站800可以向目标基站801-806分别发送切换请求，切换请求中可以包括针对目标小区的第一定时器的时长建议信息。该时长建议信息可以包括源基站建议的第一定时器的时长和/或估计的所述终端设备到达所述目标小区所需时长，以便于所述目标基站基于该时长建议信息设置目标小区的第一定时器的时长。在本示例性实施例中，多个目标基站可以基于源基站800的时长建议信息配置不同的第一定时器时长。另外，所述目标基站还可以进一步设置第二定时器，相关细节在此不再重复。
在本示例性应用场景中，源基站800还可以根据终端设备移动的位置将更新的时长建议信息发送给各个目标基站，以避免目标基站为终端设备预留资源的时间过长。源基站800可以周期地或非周期地通过切换请求发送上述更新的时长建议信息。
图9为本公开另一示例性应用场景示意图。本示例性应用场景中的源基站和目标基站分别对应于上述第一网络设备和第二网络设备。
在本示例性应用场景中，终端设备在一定范围内来回移动。源基站900可以向终端设备周围的多个目标小区(例如目标基站901-906)发送切换请求，切换请求中可以包括针对目标小区的第一定时器的时长建议信息。该时 长建议信息可以包括源基站建议的第一定时器的时长和/或估计的所述终端设备到达所述目标小区所需时长，以便于所述目标基站基于该时长建议信息设置目标小区的第一定时器的时长。在本示例性实施例中，所述多个目标基站可以基于源基站900的时长建议信息配置相同的第一定时器时长。另外，所述目标基站还可以进一步设置第二定时器，相关细节在此不再重复。
在本示例性应用场景中，源基站900还可以根据终端设备移动的位置将更新的时长建议信息发送给各个目标基站，以避免目标基站为终端设备预留资源的时间过长。源基站900可以周期地或非周期地通过切换请求发送上述更新的时长建议信息。
本公开一示例性实施例提供一种网络设备。如图10所示，网络设备1000可包括发送单元1010和接收单元1020。
所述发送单元1010，配置为向第二网络设备发送切换请求，所述切换请求中包括以下至少一项：条件切换指示信息、针对第一定时器的时长建议信息。
所述接收单元1020，配置为接收所述第二网络设备发送的切换命令，所述切换命令中包括用于切换的配置信息以及所述第一定时器的时长，所述第一定时器用于控制所述切换命令中的所述配置信息的有效时间。
所述发送单元1010还配置为向终端设备发送所述切换命令、以及所述网络设备1000设置的所述终端设备向所述第二网络设备发起切换的条件。
在一示例性实施例中，所述条件切换指示信息用于指示所述切换请求是用于条件切换。
在一示例性实施例中，所述针对第一定时器的时长建议信息包括以下至少一项：建议的第一定时器的时长、估计的所述终端设备到达所述第二网络设备的小区所需时长。
在一示例性实施例中，所述网络设备1000还包括：处理单元1030，配置为根据以下中的至少一项确定所述针对第一定时器的时长建议信息：所述终端设备的移动速度、所述终端设备的移动方向、所述终端设备当前上报的服务小区信号质量。
在一示例性实施例中，所述发送单元1010还配置为：向所述第二网络设备发送更新的所述针对第一定时器的时长建议信息。
在一示例性实施例中，所述切换命令中还包括：针对用于接入所述第二网络设备的小区的部分资源配置的第二定时器的时长。
在一示例性实施例中，所述用于接入所述第二网络设备的小区的部分资源包括：专用随机接入信道RACH资源。
在一示例性实施例中，所述专用RACH资源包括专用前导码。
在一示例性实施例中，所述发送单元1010配置为：向所述终端设备的移动方向上的至少一个第二网络设备发送所述切换请求；或者向所述网络设备周围的至少一个第二网络设备发送所述切换请求。
应理解，上述网络设备1000的实施例可对应于本公开中第一网络设备相关的方法实施例，并且所述网络设备1000中的各个单元的上述和其它操作和/或功能可分别为了第一网络设备相关的方法实施例及示例的相应流程，为了简洁，相关细节在此不再重复。
本公开一示例性实施例提供一种网络设备。如图11所示，网络设备1100可包括接收单元1110、处理单元1120和发送单元1130。
所述接收单元1110，配置为接收第一网络设备发送的切换请求，所述切换请求中包括以下至少一项：条件切换指示信息、针对第一定时器的时长建议信息；
所述处理单元1120，配置为根据所述条件切换指示信息和所述针对第一定时器的时长建议信息中的至少一项，配置所述第一定时器的时长；
所述发送单元1120，配置为向所述第一网络设备发送切换命令，所述切换命令中包括用于切换的配置信息以及所述第一定时器的时长，所述第一定时器用于控制所述切换命令中的所述配置信息的有效时间。
在一示例性实施例中，所述条件切换指示信息用于指示所述切换请求是用于条件切换。
在一示例性实施例中，所述针对第一定时器的时长建议信息包括以下至少一项：建议的第一定时器的时长、估计的所述终端设备到达所述网络设备的小区所需时长。
在一示例性实施例中，所述处理单元1120配置为：
当所述切换请求中包括所述条件切换指示信息时，根据所述条件切换指示信息确定所述切换请求是用于条件切换，并配置用于条件切换的所述第一定时器的时长；
当所述切换请求中包括所述针对第一定时器的时长建议信息时，根据所述针对第一定时器的时长建议信息，配置所述第一定时器的时长；
当所述切换请求中包括所述条件切换指示信息以及所述针对第一定时器的时长建议信息时，根据所述条件切换指示信息确定所述切换请求是用于条件切换，并根据所述针对第一定时器的时长建议信息，配置所述第一定时器的时长。
在一示例性实施例中，所述接收单元1110还配置为：接收所述第一网络设备发送的更新的所述针对第一定时器的时长建议信息。
在一示例性实施例中，所述处理单元1120还配置为：针对用于接入所述 网络设备的小区的部分资源配置第二定时器。所述发送单元1130向所述第一网络设备发送的所述切换命令中还包括所述第二定时器的时长。
在一示例性实施例中，所述用于接入所述网络设备的小区的部分资源包括：专用随机接入信道RACH资源。
在一示例性实施例中，所述专用RACH资源包括专用前导码。
应理解，上述网络设备1100的实施例可对应于本公开中第二网络设备相关的方法实施例，并且所述网络设备1100中的各个单元的上述和其它操作和/或功能可分别为了第二网络设备相关的方法实施例及示例的相应流程，为了简洁，相关细节在此不再重复。
本公开一示例性实施例提供一种终端设备。如图12所示，终端设备1200可包括发送单元1210和处理单元1220。
所述接收单元1220，配置为接收第一网络设备发送的切换命令、以及所述第一网络设备设置的所述终端设备1200向第二网络设备发起切换的条件，所述切换命令中包括用于切换的配置信息以及第一定时器的时长，所述第一定时器用于控制所述切换命令中的所述配置信息的有效时间；
所述处理单元1220，配置为在收到所述切换命令时启动所述第一定时器，以及在所述第一定时器未超时且所述向第二网络设备发起切换的条件满足时，发起接入所述第二网络设备的小区的过程。
在一示例性实施例中，所述切换命令中还包括：针对用于接入所述第二网络设备的小区的部分资源配置的第二定时器的时长。所述处理单元1220还配置为：在所述接收单元1210收到所述切换命令时启动所述第二定时器。
在一示例性实施例中，所述用于接入所述第二网络设备的小区的部分资源包括：专用随机接入信道RACH资源。
在一示例性实施例中，所述专用RACH资源包括专用前导码。
在一示例性实施例中，所述处理单元1220配置为：
当所述第一定时器未超时且所述向第二网络设备发起切换的条件满足、且所述第二定时器未超时时，使用所述专用RACH资源向所述第二网络设备的小区发起随机接入；
当所述第一定时器未超时且所述向第二网络设备发起切换的条件满足、且所述第二定时器已超时时，使用公共RACH资源向所述第二网络设备的小区发起随机接入。
在一示例性实施例中，所述处理单元1220还配置为：当所述第一定时器未超时，所述终端设备1200重新尝试接入所述第二网络设备的小区，且所述第二定时器已超时时，使用公共RACH资源向所述小区发起随机接入。
在一示例性实施例中，所述处理单元1220还配置为：当所述第一定时器未超时，且存在多个第二网络设备的小区满足所述发起切换的条件时，选择向第二定时器尚未超时的第二网络设备的小区发起接入过程。
所述处理单元1220还配置为：当所述第一定时器未超时，且存在多个第二网络设备的小区满足所述发起切换的条件，且在所述终端设备1200重新尝试接入其中一个第二网络设备的小区时，该第二网络设备的小区的第二定时器超时时，选择向第二定时器尚未超时的另一第二网络设备的小区发起接入过程。
应理解，上述终端设备1200的实施例可对应于本公开中终端设备相关的方法实施例，并且所述终端设备1200中的各个单元的上述和其它操作和/或功能可分别为了终端设备相关的方法实施例及示例的相应流程，为了简洁，相关细节在此不再重复。
本公开一示例性实施例提供一种网络设备，包括存储器、处理器及存储在所述存储器上并可在所述处理器上运行的计算机程序，所述处理器执行所述计算机程序时实现本公开中第一网络设备或第二网络设备所执行的操作。
如图13所示，在一示例中，网络设备1300可包括：处理器1310、存储器1320、收发器1330，其中，该处理器1310、该存储器1320和该收发器1330通过总线系统相连，该存储器1320用于存储指令，该处理器1310用于执行该存储器1320存储的指令，以控制该收发器1330发送信号。具体地，上述网络设备中发送单元和接收单元的操作可由收发器在处理器的控制下执行，处理单元的操作可由处理器执行。
应理解，处理器1310可以是中央处理单元(Central Processing Unit，简称为“CPU”)，处理器1310还可以是其他通用处理器、数字信号处理器(DSP)、专用集成电路(ASIC)、现成可编程门阵列(FPGA)或者其他可编程逻辑器件、分立门或者晶体管逻辑器件、分立硬件组件等。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。
存储器1320可以包括只读存储器和随机存取存储器，并向处理器1310提供指令和数据。存储器1320的一部分还可以包括非易失性随机存取存储器。例如，存储器1320还可以存储设备类型的信息。
总线系统1330除包括数据总线之外，还可以包括电源总线、控制总线和状态信号总线等。但是为了清楚说明起见，在图13中将各种总线都标为总线系统1330。
在实现过程中，网络设备所执行的处理可以通过处理器1330中的硬件的集成逻辑电路或者软件形式的指令完成。即本公开实施例所公开的方法的操作可以体现为硬件处理器执行完成，或者用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储器，闪存、只读存储器，可编程只读 存储器或者电可擦写可编程存储器、寄存器等存储介质中。该存储介质位于存储器1320，处理器1310读取存储器1320中的信息，结合其硬件完成上述操作。为避免重复，这里不再详细描述。
在本公开一示例性实施例中，还提供了一种终端。所述终端可包括处理器、存储器及存储在所述存储器上并可在所述处理器上运行的计算机程序，所述处理器执行所述计算机程序时实现本公开中终端设备所执行的操作。
如图14所示，在一个示例中，终端1400可包括：处理器1410、存储器1420、总线系统1430和收发器1440，其中，该处理器1410、该存储器1420和该收发器1440通过该总线系统1430相连，该存储器1420用于存储指令，该处理器1410用于执行该存储器1420存储的指令，以控制该收发器1440发送信号。具体地，上述终端设备中接收单元的操作可由收发器在处理器的控制下执行，处理单元的操作可由处理器执行。
应理解，处理器1410可以是中央处理单元(Central Processing Unit，简称为“CPU”)，处理器1410还可以是其他通用处理器、数字信号处理器(DSP)、专用集成电路(ASIC)、现成可编程门阵列(FPGA)或者其他可编程逻辑器件、分立门或者晶体管逻辑器件、分立硬件组件等。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。
存储器1420可以包括只读存储器和随机存取存储器，并向处理器1410提供指令和数据。存储器1420的一部分还可以包括非易失性随机存取存储器。例如，存储器1420还可以存储设备类型的信息。
总线系统1430除包括数据总线之外，还可以包括电源总线、控制总线和状态信号总线等。但是为了清楚说明起见，在图14中将各种总线都标为总线系统1430。
在实现过程中，终端设备所执行的处理可以通过处理器1410中的硬件的集成逻辑电路或者软件形式的指令完成。即本公开实施例所公开的方法的步骤可以体现为硬件处理器执行完成，或者用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储器，闪存、只读存储器，可编程只读存储器或者电可擦写可编程存储器、寄存器等存储介质中。该存储介质位于存储器1420，处理器1410读取存储器1420中的信息，结合其硬件完成上述方法的步骤。为避免重复，这里不再详细描述。
本公开一示例性实施例还提供了一种计算机可读存储介质，其上存储有计算机程序，所述计算机程序被处理器执行时实现如本公开上述实施例所述的任一方法的处理。
本领域普通技术人员可以理解，上文中所公开方法中的全部或某些步骤、系统、装置中的功能模块/单元可以被实施为软件、固件、硬件及其适当的组合。在硬件实施方式中，在以上描述中提及的功能模块/单元之间的划分不一 定对应于物理组件的划分；例如，一个物理组件可以具有多个功能，或者一个功能或步骤可以由若干物理组件合作执行。某些物理组件或所有物理组件可以被实施为由处理器，如中央处理器、数字信号处理器或微处理器执行的软件，或者被实施为硬件，或者被实施为集成电路，如专用集成电路。这样的软件可以分布在计算机可读介质上，计算机可读介质可以包括计算机存储介质(或非暂时性介质)和通信介质(或暂时性介质)。如本领域普通技术人员公知的，术语计算机存储介质包括在用于存储信息(诸如计算机可读指令、数据结构、程序模块或其他数据)的任何方法或技术中实施的易失性和非易失性、可移除和不可移除介质。计算机存储介质包括但不限于RAM、ROM、EEPROM、闪存或其他存储器技术、CD-ROM、数字多功能盘(DVD)或其他光盘存储、磁盒、磁带、磁盘存储或其他磁存储装置、或者可以用于存储期望的信息并且可以被计算机访问的任何其他的介质。此外，本领域普通技术人员公知的是，通信介质通常包含计算机可读指令、数据结构、程序模块或者诸如载波或其他传输机制之类的调制数据信号中的其他数据，并且可包括任何信息递送介质。
本公开描述了多个实施例，但是该描述是示例性的，而不是限制性的，并且对于本领域的普通技术人员来说显而易见的是，在本公开所描述的实施例包含的范围内可以有更多的实施例和实现方案。尽管在附图中示出了许多可能的特征组合，并在具体实施方式中进行了讨论，但是所公开的特征的许多其它组合方式也是可能的。除非特意加以限制的情况以外，任何实施例的任何特征或元件可以与任何其它实施例中的任何其他特征或元件结合使用，或可以替代任何其它实施例中的任何其他特征或元件。
本公开包括并设想了与本领域普通技术人员已知的特征和元件的组合。本公开已经公开的实施例、特征和元件也可以与任何常规特征或元件组合，以形成由权利要求限定的独特的发明方案。任何实施例的任何特征或元件也可以与来自其它发明方案的特征或元件组合，以形成另一个由权利要求限定的独特的发明方案。因此，应当理解，在本公开中示出和/或讨论的任何特征可以单独地或以任何适当的组合来实现。因此，除了根据所附权利要求及其等同替换所做的限制以外，实施例不受其它限制。此外，可以在所附权利要求的保护范围内进行各种修改和改变。
此外，在描述具有代表性的实施例时，说明书可能已经将方法和/或过程呈现为特定的步骤序列。然而，在该方法或过程不依赖于本文所述步骤的特定顺序的程度上，该方法或过程不应限于所述的特定顺序的步骤。如本领域普通技术人员将理解的，其它的步骤顺序也是可能的。因此，说明书中阐述的步骤的特定顺序不应被解释为对权利要求的限制。此外，针对该方法和/或过程的权利要求不应限于按照所写顺序执行它们的步骤，本领域技术人员可以容易地理解，这些顺序可以变化，并且仍然保持在本公开实施例的精神 和范围内。
以上所述，仅为本公开的具体实施方式，但本公开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公开揭露的技术范围内，可轻易想到各种等效的修改或替换。本公开的保护范围以权利要求所定义的范围为准。

Claims (56)

  1. 一种小区切换方法，包括：
    第一网络设备向第二网络设备发送切换请求，所述切换请求中包括以下至少一项：条件切换指示信息、针对第一定时器的时长建议信息；
    所述第一网络设备接收所述第二网络设备发送的切换命令，所述切换命令中包括用于切换的配置信息以及所述第一定时器的时长，所述第一定时器用于控制所述切换命令中的所述配置信息的有效时间；
    所述第一网络设备向终端设备发送所述切换命令、以及所述第一网络设备设置的所述终端设备向所述第二网络设备发起切换的条件。
  2. 根据权利要求1所述的方法，其特征在于，所述条件切换指示信息用于指示所述切换请求是用于条件切换。
  3. 根据权利要求1或2所述的方法，其特征在于，所述针对第一定时器的时长建议信息包括以下至少一项：建议的第一定时器的时长、估计的所述终端设备到达所述第二网络设备的小区所需时长。
  4. 根据权利要求1-3中任一项所述的方法，其特征在于，所述方法还包括：所述第一网络设备根据以下中的至少一项确定所述针对第一定时器的时长建议信息：所述终端设备的移动速度、所述终端设备的移动方向、所述终端设备当前上报的服务小区信号质量。
  5. 根据权利要求1-4中任一项所述的方法，其特征在于，所述方法还包括：所述第一网络设备向所述第二网络设备发送更新的所述针对第一定时器的时长建议信息。
  6. 根据权利要求1-5中任一项所述的方法，其特征在于，所述切换命令中还包括：针对用于接入所述第二网络设备的小区的部分资源配置的第二定时器的时长。
  7. 根据权利要求6所述的方法，其特征在于，所述用于接入所述第二网络设备的小区的部分资源包括：专用随机接入信道RACH资源。
  8. 根据权利要求7所述的方法，其特征在于，所述专用RACH资源包括专用前导码。
  9. 根据权利要求1-8中任一项所述的方法，其特征在于，所述第一网络设备向所述第二网络设备发送所述切换请求包括：
    所述第一网络设备向所述终端设备的移动方向上的至少一个第二网络设备发送所述切换请求；或者
    所述第一网络设备向所述第一网络设备周围的至少一个第二网络设备发送所述切换请求。
  10. 一种小区切换方法，包括：
    第二网络设备接收第一网络设备发送的切换请求，所述切换请求中包括以下至少一项：条件切换指示信息、针对第一定时器的时长建议信息；
    所述第二网络设备根据所述条件切换指示信息和所述针对第一定时器的时长建议信息中的至少一项，配置所述第一定时器的时长；
    所述第二网络设备向所述第一网络设备发送切换命令，所述切换命令中包括用于切换的配置信息以及所述第一定时器的时长，所述第一定时器用于控制所述切换命令中的所述配置信息的有效时间。
  11. 根据权利要求10所述的方法，其特征在于，所述条件切换指示信息用于指示所述切换请求是用于条件切换。
  12. 根据权利要求10或11所述的方法，其特征在于，所述针对第一定时器的时长建议信息包括以下至少一项：建议的第一定时器的时长、估计的所述终端设备到达所述第二网络设备的小区所需时长。
  13. 根据权利要求10-12中任一项所述的方法，其特征在于，所述第二网络设备根据所述条件切换指示信息和所述针对第一定时器的时长建议信息中的至少一项，配置所述第一定时器的时长，包括：
    当所述切换请求中包括所述条件切换指示信息时，所述第二网络设备根据所述条件切换指示信息确定所述切换请求是用于条件切换，并配置用于条件切换的所述第一定时器的时长；
    当所述切换请求中包括所述针对第一定时器的时长建议信息时，所述第二网络设备根据所述针对第一定时器的时长建议信息，配置所述第一定时器的时长；
    当所述切换请求中包括所述条件切换指示信息以及所述针对第一定时器的时长建议信息时，所述第二网络设备根据所述条件切换指示信息确定所述切换请求是用于条件切换，并根据所述针对第一定时器的时长建议信息，配置所述第一定时器的时长。
  14. 根据权利要求10-13中任一项所述的方法，其特征在于，所述方法还包括：所述第二网络设备接收所述第一网络设备发送的更新的所述针对第一定时器的时长建议信息。
  15. 根据权利要求10-14中任一项所述的方法，其特征在于，所述方法还包括：
    所述第二网络设备针对用于接入所述第二网络设备的小区的部分资源配置第二定时器；
    所述第二网络设备向所述第一网络设备发送的所述切换命令中还包括所述第二定时器的时长。
  16. 根据权利要求15所述的方法，其特征在于，所述第二网络设备针对用于接入所述第二网络设备的小区的部分资源配置第二定时器包括：
    所述第二网络设备针对专用随机接入信道RACH资源配置第二定时器。
  17. 根据权利要求16所述的方法，其特征在于，所述第二网络设备针对所述专用RACH资源配置第二定时器包括：
    所述第二网络设备针对专用前导码配置第二定时器。
  18. 一种小区切换方法，包括：
    终端设备接收第一网络设备发送的切换命令以及所述第一网络设备设置的所述终端设备向第二网络设备发起切换的条件，所述切换命令中包括用于切换的配置信息以及第一定时器的时长，所述第一定时器用于控制所述切换命令中的所述配置信息的有效时间；
    所述终端设备在收到所述切换命令时启动所述第一定时器；
    在所述第一定时器未超时且所述向第二网络设备发起切换的条件满足时，所述终端设备发起接入所述第二网络设备的小区的过程。
  19. 根据权利要求18所述的方法，其特征在于，所述切换命令中还包括：针对用于接入所述第二网络设备的小区的部分资源配置的第二定时器的时长；
    所述方法还包括：所述终端设备在收到所述切换命令时启动所述第二定时器。
  20. 根据权利要求19所述的方法，其特征在于，所述用于接入所述第二网络设备的小区的部分资源包括：专用随机接入信道RACH资源。
  21. 根据权利要求20所述的方法，其特征在于，所述专用RACH资源包括专用前导码。
  22. 根据权利要求20或21所述的方法，其特征在于，所述在所述第一定时器未超时且所述向第二网络设备发起切换的条件满足时，所述终端设备发起接入所述第二网络设备的小区的过程，包括：
    当所述第一定时器未超时且所述向第二网络设备发起切换的条件满足、且所述第二定时器未超时时，所述终端设备使用所述专用RACH资源向所述第二网络设备的小区发起随机接入；
    当所述第一定时器未超时且所述向第二网络设备发起切换的条件满足、且所述第二定时器已超时时，所述终端设备使用公共RACH资源向所述第二网络设备的小区发起随机接入。
  23. 根据权利要求22所述的方法，其特征在于，所述方法还包括：当所述第一定时器未超时，所述终端设备重新尝试接入所述第二网络设备的小区，且所述第二定时器已超时时，所述终端设备使用公共RACH资源向所述小区 发起随机接入。
  24. 根据权利要求19-23中任一项所述的方法，其特征在于，所述方法还包括：当所述第一定时器未超时，且存在多个第二网络设备的小区满足所述发起切换的条件时，所述终端设备选择向第二定时器尚未超时的第二网络设备的小区发起接入过程。
  25. 根据权利要求19-24中任一项所述的方法，其特征在于，所述方法还包括：当所述第一定时器未超时，且存在多个第二网络设备的小区满足所述发起切换的条件，且在所述终端设备重新尝试接入其中一个第二网络设备的小区时，该第二网络设备的小区的第二定时器超时时，所述终端设备选择向第二定时器尚未超时的另一第二网络设备的小区发起接入过程。
  26. 一种网络设备，包括：
    发送单元，配置为向第二网络设备发送切换请求，所述切换请求中包括以下至少一项：条件切换指示信息、针对第一定时器的时长建议信息；
    接收单元，配置为接收所述第二网络设备发送的切换命令，所述切换命令中包括用于切换的配置信息以及所述第一定时器的时长，所述第一定时器用于控制所述切换命令中的所述配置信息的有效时间；
    其中，所述发送单元还配置为向终端设备发送所述切换命令、以及所述网络设备设置的所述终端设备向所述第二网络设备发起切换的条件。
  27. 根据权利要求26所述的网络设备，其特征在于，所述条件切换指示信息用于指示所述切换请求是用于条件切换。
  28. 根据权利要求26或27所述的网络设备，其特征在于，所述针对第一定时器的时长建议信息包括以下至少一项：建议的第一定时器的时长、估计的所述终端设备到达所述第二网络设备的小区所需时长。
  29. 根据权利要求26-28中任一项所述的网络设备，其特征在于，所述网络设备还包括：处理单元，配置为根据以下中的至少一项确定所述针对第一定时器的时长建议信息：所述终端设备的移动速度、所述终端设备的移动方向、所述终端设备当前上报的服务小区信号质量。
  30. 根据权利要求26-29中任一项所述的网络设备，其特征在于，所述发送单元还配置为：向所述第二网络设备发送更新的所述针对第一定时器的时长建议信息。
  31. 根据权利要求26-30中任一项所述的网络设备，其特征在于，所述切换命令中还包括：针对用于接入所述第二网络设备的小区的部分资源配置的第二定时器的时长。
  32. 根据权利要求31所述的网络设备，其特征在于，所述用于接入所述第二网络设备的小区的部分资源包括：专用随机接入信道RACH资源。
  33. 根据权利要求32所述的网络设备，其特征在于，所述专用RACH资源包括专用前导码。
  34. 根据权利要求26-33中任一项所述的网络设备，其特征在于，所述发送单元配置为：
    向所述终端设备的移动方向上的至少一个第二网络设备发送所述切换请求；或者
    向所述网络设备周围的至少一个第二网络设备发送所述切换请求。
  35. 一种网络设备，包括：
    接收单元，配置为接收第一网络设备发送的切换请求，所述切换请求中包括以下至少一项：条件切换指示信息、针对第一定时器的时长建议信息；
    处理单元，配置为根据所述条件切换指示信息和所述针对第一定时器的时长建议信息中的至少一项，配置所述第一定时器的时长；
    发送单元，配置为向所述第一网络设备发送切换命令，所述切换命令中包括用于切换的配置信息以及所述第一定时器的时长，所述第一定时器用于控制所述切换命令中的所述配置信息的有效时间。
  36. 根据权利要求35所述的网络设备，其特征在于，所述条件切换指示信息用于指示所述切换请求是用于条件切换。
  37. 根据权利要求35或36所述的网络设备，其特征在于，所述针对第一定时器的时长建议信息包括以下至少一项：建议的第一定时器的时长、估计的所述终端设备到达所述网络设备的小区所需时长。
  38. 根据权利要求35-37中任一项所述的网络设备，其特征在于，所述处理单元配置为：
    当所述切换请求中包括所述条件切换指示信息时，根据所述条件切换指示信息确定所述切换请求是用于条件切换，并配置用于条件切换的所述第一定时器的时长；
    当所述切换请求中包括所述针对第一定时器的时长建议信息时，根据所述针对第一定时器的时长建议信息，配置所述第一定时器的时长；
    当所述切换请求中包括所述条件切换指示信息以及所述针对第一定时器的时长建议信息时，根据所述条件切换指示信息确定所述切换请求是用于条件切换，并根据所述针对第一定时器的时长建议信息，配置所述第一定时器的时长。
  39. 根据权利要求35-38中任一项所述的网络设备，其特征在于，所述接收单元还配置为：接收所述第一网络设备发送的更新的所述针对第一定时器的时长建议信息。
  40. 根据权利要求35-39中任一项所述的网络设备，其特征在于，所述处理单元还配置为：针对用于接入所述网络设备的小区的部分资源配置第二定时器；
    所述发送单元向所述第一网络设备发送的所述切换命令中还包括所述第二定时器的时长。
  41. 根据权利要求40所述的网络设备，其特征在于，所述用于接入所述网络设备的小区的部分资源包括：专用随机接入信道RACH资源。
  42. 根据权利要求41所述的网络设备，其特征在于，所述专用RACH资源包括专用前导码。
  43. 一种终端设备，包括：
    接收单元，配置为接收第一网络设备发送的切换命令、以及所述第一网络设备设置的所述终端设备向第二网络设备发起切换的条件，所述切换命令中包括用于切换的配置信息以及第一定时器的时长，所述第一定时器用于控制所述切换命令中的所述配置信息的有效时间；
    处理单元，配置为在收到所述切换命令时启动所述第一定时器，以及在所述第一定时器未超时且所述向第二网络设备发起切换的条件满足时，发起接入所述第二网络设备的小区的过程。
  44. 根据权利要求43所述的终端设备，其特征在于，所述切换命令中还包括：针对用于接入所述第二网络设备的小区的部分资源配置的第二定时器的时长；
    所述处理单元还配置为：在所述接收单元收到所述切换命令时启动所述第二定时器。
  45. 根据权利要求44所述的终端设备，其特征在于，所述用于接入所述第二网络设备的小区的部分资源包括：专用随机接入信道RACH资源。
  46. 根据权利要求45所述的终端设备，其特征在于，所述专用RACH资源包括专用前导码。
  47. 根据权利要求45或46所述的终端设备，其特征在于，所述处理单元配置为：
    当所述第一定时器未超时且所述向第二网络设备发起切换的条件满足、且所述第二定时器未超时时，使用所述专用RACH资源向所述第二网络设备的小区发起随机接入；
    当所述第一定时器未超时且所述向第二网络设备发起切换的条件满足、且所述第二定时器已超时时，使用公共RACH资源向所述第二网络设备的小区发起随机接入。
  48. 根据权利要求47所述的终端设备，其特征在于，所述处理单元还配置为：当所述第一定时器未超时，所述终端设备重新尝试接入所述第二网络设备的小区，且所述第二定时器已超时时，使用公共RACH资源向所述小区发起随机接入。
  49. 根据权利要求44-48中任一项所述的终端设备，其特征在于，所述处理单元还配置为：当所述第一定时器未超时，且存在多个第二网络设备的小区满足所述发起切换的条件时，选择向第二定时器尚未超时的第二网络设备的小区发起接入过程。
  50. 根据权利要求44-49中任一项所述的终端设备，其特征在于，所述处理单元还配置为：当所述第一定时器未超时，且存在多个第二网络设备的小区满足所述发起切换的条件，且在所述终端设备重新尝试接入其中一个第二网络设备的小区时，该第二网络设备的小区的第二定时器超时时，选择向第二定时器尚未超时的另一第二网络设备的小区发起接入过程。
  51. 一种网络设备，包括存储器、处理器及存储在所述存储器上并可在所述处理器上运行的计算机程序，所述处理器执行所述计算机程序时实现如权利要求1至9中任一项所述的方法。
  52. 一种网络设备，包括存储器、处理器及存储在所述存储器上并可在所述处理器上运行的计算机程序，所述处理器执行所述计算机程序时实现如权利要求10至17中任一项所述的方法。
  53. 一种终端设备，包括存储器、处理器及存储在所述存储器上并可在所述处理器上运行的计算机程序，所述处理器执行所述计算机程序时实现如权利要求18至25中任一项所述的方法。
  54. 一种计算机可读存储介质，其上存储有计算机程序，所述计算机程序被处理器执行时实现如权利要求1至9中任一项所述的方法。
  55. 一种计算机可读存储介质，其上存储有计算机程序，所述计算机程序被处理器执行时实现如权利要求10至17中任一项所述的方法。
  56. 一种计算机可读存储介质，其上存储有计算机程序，所述计算机程序被处理器执行时实现如权利要求18至25中任一项所述的方法。
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