WO2021184281A1 - Procédé et appareil de commutation de cellule - Google Patents

Procédé et appareil de commutation de cellule Download PDF

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Publication number
WO2021184281A1
WO2021184281A1 PCT/CN2020/080143 CN2020080143W WO2021184281A1 WO 2021184281 A1 WO2021184281 A1 WO 2021184281A1 CN 2020080143 W CN2020080143 W CN 2020080143W WO 2021184281 A1 WO2021184281 A1 WO 2021184281A1
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WO
WIPO (PCT)
Prior art keywords
network device
terminal device
response
handover
information
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PCT/CN2020/080143
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English (en)
Chinese (zh)
Inventor
冯玺宝
李振宇
韩金侠
李志军
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华为技术有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to PCT/CN2020/080143 priority Critical patent/WO2021184281A1/fr
Priority to CN202080095901.7A priority patent/CN115088304A/zh
Publication of WO2021184281A1 publication Critical patent/WO2021184281A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/08—Reselecting an access point
    • H04W36/083—Reselecting an access point wherein at least one of the access points is a moving node
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/16—Performing reselection for specific purposes
    • H04W36/18—Performing reselection for specific purposes for allowing seamless reselection, e.g. soft reselection

Definitions

  • the embodiments of the present application relate to communication technologies, and in particular, to a cell handover method and device.
  • WIFI wireless local area network
  • STA terminal
  • Roaming refers to the STA in the WLAN handing over from one AP to another AP, and the STAs after roaming can still communicate normally.
  • the STA usually performs handover based on decision-making. For example, the STA measures the signal quality of the current serving AP.
  • the STA detects that the signal quality of the current serving AP becomes weaker (the specific trigger conditions can be decided by the STA itself)
  • the STA Will send a neighbor list request to the current serving AP, the current serving AP feeds back the neighbor list, and the STA selects an AP as the target AP for handover from the neighbor list fed back by the current serving AP.
  • the handover decision by the STA is likely to produce a ping-pong handover effect; on the other hand, the existing handover procedure causes a large handover delay.
  • the embodiments of the present application provide a cell handover method and device, which reduce the handover delay of the STA, and ensure that the STA quickly switches from a source cell to a target cell.
  • the first aspect of the present application provides a cell handover method, including: a first network device determines to switch an accessed terminal device to a second network device, and the coverage area of the second network device is a neighboring area of the coverage area of the first network device .
  • the first network device sends the capability information of the terminal device and the first authentication information to the second network device, where the first authentication information is used by the second network device to perform link authentication on the terminal device, the The first network device receives the access permission information from the second network device.
  • the first network device sends the The terminal device sends a second switching command, where the second switching command is used to instruct the terminal device to switch to the second network device, and the second switching command includes second authentication information.
  • the first network device receives a second handover command response from the terminal device, where the second handover command response is used to indicate that the terminal device is ready for handover, and the first network device sends to the second network device
  • the state transition command is used to indicate that the terminal device is ready for handover.
  • the first network device makes the cell handover decision, thereby avoiding ping-pong handover, and the first network device generates authentication information for link authentication, and sends the authentication information to the second network device And the terminal device, thereby saving the air interface signaling for the terminal device to send authentication information to the second network device, and further shortening the air interface delay during handover.
  • the first authentication information includes an authentication random number, and the authentication random number is generated by the first network device.
  • the second authentication information includes the authentication random number, wherein the random number included in the first authentication information is the same as the random number included in the second authentication information.
  • the sending, by the first network device, of the capability information of the terminal device and the first authentication information to the second network device includes: The device sends a first handover command, and the first handover command includes the capability information of the terminal device and the first authentication information.
  • the first network device receiving access permission information from the second network device includes: the first network device receives a first handover command response from the second network device, and the first handover command response includes The access permission information.
  • the method further includes:
  • the first network device sends a path switch command response to the second network device, where the path switch command response is used to indicate the success or failure of the routing information update.
  • the method further includes: the first network device and the second network device perform data before the terminal device change.
  • the first network device sends the downlink data that has not been sent to the terminal device to the second network device.
  • the second network device can send the downlink data to the terminal device, thereby Ensure that the STA's downlink data will not be lost during the handover process.
  • the method before the first network device determines to switch the accessed terminal device to the second network device, the method further includes:
  • the determination by the first network device to switch the accessed terminal device to the second network device includes:
  • the first network device determines to switch the terminal device to the second network device according to the neighboring cell measurement result.
  • a second aspect of the present application provides a cell handover method, including: a second network device receives capability information and first authentication information of a terminal device from a first network device, and the terminal device has accessed the first network device, The first authentication information is used by the second network device to perform link authentication on the terminal device, the second network device sends access permission information to the first network device, and the access permission The information is used to indicate that the terminal device is allowed to access the second network device.
  • the second network device receives a state transition command from the first network device, where the state transition command is used to indicate that the terminal device is ready for handover, and the second network device sends the first network device to the terminal device. Message, the first message is used to indicate that the second network device and the terminal device have successfully authenticated the link, and the second network device is associated with the terminal device.
  • the first message is the first message unicasted by the second network device to the terminal device.
  • the air interface signaling for the terminal device to send authentication information to the second network device is saved, thereby reducing This reduces the delay of cell handover.
  • the associating of the second network device with the terminal device includes: the second network device receives a re-association request from the terminal device, and the second network device sends the terminal device a re-association request. The device sends a reassociation response.
  • the first authentication information includes an authentication random number, and the authentication random number is generated by the first network device.
  • the second network device receiving the capability information of the terminal device and the first authentication information from the first network device includes: the second network device receives a handover request from the first network device , The handover request includes the capability information of the terminal device and the first authentication information.
  • the second network device sending access permission information to the first network device includes: the second network device sends a handover request response to the first network device, and the handover request response includes the access License information.
  • the first message is an authentication response or a quick conversion action response.
  • the method further includes:
  • the second network device receives a path switch command response from the first network device, where the path switch command response is used to indicate the success or failure of the routing information update.
  • the method further includes: the second network device and the first network device perform the communication of the terminal device Data forwarding.
  • a third aspect of the present application provides a cell handover method, including: a terminal device receives a second handover command from a first network device, where the second handover command is used to instruct the terminal device to switch to a second network device, and the first The second handover command includes second authentication information, the terminal device sends a second handover command response to the first network device, and the second handover command response is used to indicate that the terminal device is ready for handover, so The terminal device receives a first message sent by the second network device, where the first message is used to indicate that the second network device has successfully authenticated the link with the terminal device, and in response to the first message, The terminal device is associated with the second network device.
  • the first network device makes the cell handover decision, thereby avoiding ping-pong handover, and the first network device generates authentication information for link authentication, and sends the authentication information to the second network device And the terminal device, thereby saving the air interface signaling for the terminal device to send authentication information to the second network device, and further shortening the air interface delay during handover.
  • associating the terminal device with the second network device includes:
  • the terminal device receives an association response from the second network device.
  • the first message is an authentication response or a quick conversion action response.
  • the method before the terminal device receives the second handover command from the first network device, the method further includes:
  • the terminal device performs adjacent cell measurement according to the adjacent cell measurement configuration
  • the terminal device sends the neighboring cell measurement result to the first network device.
  • the terminal device receives the neighboring cell measurement configuration from the first network device, where the neighboring cell measurement configuration is used to configure the neighboring cell of the first network device and the measurement resource of the neighboring cell.
  • the terminal device sending the neighbor cell measurement result to the first network device includes:
  • the terminal device sends a wireless measurement action frame to the first network device, the wireless measurement action frame includes the neighbor cell measurement report field, and the neighbor cell measurement result is carried in the neighbor cell measurement report field.
  • the terminal device receiving the neighbor cell measurement configuration from the first network device includes:
  • the terminal device receives an association response or a re-association response from the first network device, and the association response or the re-association response includes the neighboring cell measurement configuration.
  • the association response or the re-association response includes a supplier-specific domain, and the neighboring cell measurement configuration is carried in the supplier-specific domain.
  • the terminal device receives neighboring cell measurement update information from the first network device, where the neighboring cell measurement update information is used to update the neighboring cell of the first network device.
  • the terminal device receiving neighbor cell measurement update information from the first network device includes:
  • the terminal device receives a wireless measurement request frame from the first network device, the wireless measurement request frame includes a neighbor cell measurement update field, and the neighbor cell measurement update information is carried in the neighbor cell measurement update field.
  • the wireless measurement request frame further includes a neighbor cell measurement stop field, and the neighbor cell measurement stop field carries neighbor cell measurement stop information, and the neighbor cell measurement stop information is used to instruct to stop measuring the neighbor cell. .
  • a fourth aspect of the present application provides a first network device, including:
  • the determining module is used to determine to switch the terminal device from the first network device to the second network device;
  • a sending module configured to send capability information of the terminal device and first authentication information to the second network device, where the first authentication information is used by the second network device to link the terminal device Authentication
  • a receiving module configured to receive access permission information from the second network device, where the access permission information is used to indicate that the terminal device is allowed to access the second network device;
  • the sending module is further configured to send a second switching command to the terminal device, where the second switching command is used to instruct the terminal device to switch to the second network device, and the second switching command includes the first switching command.
  • the receiving module is further configured to receive a second handover command response from the terminal device, where the second handover command response is used to indicate that the terminal device is ready for handover;
  • the sending module is further configured to send a state transition command to the second network device, where the state transition command is used to indicate that the terminal device is ready for handover.
  • the first authentication information includes an authentication random number, and the authentication random number is generated by the first network device.
  • the second authentication information includes the authentication random number.
  • the sending module sending the capability information of the terminal device and the first authentication information to the second network device includes:
  • the receiving module receiving access permission information from the second network device includes:
  • the receiving module is further configured to receive a path switch command from the second network device after the terminal device accesses the second network device, and the path switch command is used for Instruct the terminal device to update routing information;
  • the sending module is further configured to send a path switching command response to the second network device, where the path switching command response is used to indicate the success or failure of the routing information update.
  • the data forwarding module is used to forward the data of the terminal device with the second network device.
  • the receiving module is further configured to: receive the neighboring cell measurement result of the first network device from the terminal device;
  • the determining module is specifically configured to determine to switch the terminal device to the second network device according to the neighboring cell measurement result.
  • a fifth aspect of the present application provides a second network device, including:
  • the receiving module is configured to receive capability information and first authentication information of a terminal device from a first network device.
  • the terminal device has accessed the first network device, and the first authentication information is used for the second network device.
  • the network device performs link authentication on the terminal device;
  • a sending module configured to send access permission information to the first network device, where the access permission information is used to indicate that the terminal device is allowed to access the second network device;
  • the receiving module is further configured to receive a state transition command from the first network device, where the state transition command is used to indicate that the terminal device is ready for handover;
  • the sending module is further configured to send a first message to the terminal device, where the first message is used to indicate that the link between the second network device and the terminal device is successfully authenticated;
  • the association module is used to associate the second network device with the terminal device.
  • association module is specifically configured to:
  • the first authentication information includes an authentication random number, and the authentication random number is generated by the first network device.
  • the receiving module receiving the capability information and the first authentication information of the terminal device from the first network device includes:
  • the sending module sending access permission information to the first network device includes:
  • the first message is an authentication response or a quick conversion action response.
  • the sending module is further configured to send a path switch command to the first network device after the second network device is associated with the terminal device, and the path switch command is used for Instruct the terminal device to update routing information;
  • the receiving module is further configured to receive a path switching command response from the first network device, where the path switching command response is used to indicate the success or failure of the routing information update.
  • the data forwarding module is used to forward the data of the terminal device with the first network device.
  • a sixth aspect of the present application provides a terminal device, including:
  • a receiving module configured to receive a second switching command from a first network device, the second switching command is used to instruct the terminal device to switch to a second network device, and the second switching command includes second authentication information;
  • a sending module configured to send a second handover command response to the first network device, where the second handover command response is used to indicate that the terminal device is ready for handover;
  • the receiving module is further configured to receive a first message sent by the second network device, where the first message is used to indicate that the link between the second network device and the terminal device is successfully authenticated;
  • the association module is configured to associate the terminal device with the second network device in response to the first message.
  • association module is specifically configured to:
  • the first message is an authentication response or a quick conversion action response.
  • the measurement module is used to perform adjacent cell measurement according to the adjacent cell measurement configuration
  • the sending module is further configured to send the neighboring cell measurement result to the first network device.
  • the receiving module is further configured to:
  • the neighboring cell measurement configuration is received from the first network device, where the neighboring cell measurement configuration is used to configure the neighboring cell of the first network device and the measurement resource of the neighboring cell.
  • the sending module sending the neighboring cell measurement result to the first network device includes:
  • the receiving module receiving the neighboring cell measurement configuration from the first network device includes:
  • the association response or the re-association response includes a supplier-specific domain, and the neighboring cell measurement configuration is carried in the supplier-specific domain.
  • the receiving module is further configured to:
  • the terminal device receives neighboring cell measurement update information from the first network device, where the neighboring cell measurement update information is used to update the neighboring cell of the first network device.
  • the receiving module receiving neighboring cell measurement update information from the first network device includes:
  • a wireless measurement request frame is received from the first network device, the wireless measurement request frame includes a neighbor cell measurement update field, and the neighbor cell measurement update information is carried in the neighbor cell measurement update field.
  • the wireless measurement request frame further includes a neighbor cell measurement stop field, and the neighbor cell measurement stop field carries neighbor cell measurement stop information, and the neighbor cell measurement stop information is used to instruct to stop measuring the neighbor cell. .
  • a seventh aspect of the present application provides a network device, including a processor, a memory, and a transceiver.
  • the memory is used to store instructions
  • the transceiver is used to communicate with other devices
  • the processor is used to execute data stored in the memory. Instructions, so that the network device executes the methods described in the first aspect of the present application and various exemplary manners.
  • An eighth aspect of the present application provides a network device, including a processor, a memory, and a transceiver.
  • the memory is used to store instructions
  • the transceiver is used to communicate with other devices
  • the processor is used to execute data stored in the memory. Instructions, so that the network device executes the method described in the second aspect of the present application and each exemplary manner.
  • a ninth aspect of the present application provides a terminal device, including a processor, a memory, and a transceiver.
  • the memory is used to store instructions
  • the transceiver is used to communicate with other devices
  • the processor is used to execute data stored in the memory. Instructions, so that the terminal device executes the methods described in the third aspect of the present application and various exemplary manners.
  • the tenth aspect of the present application provides a computer-readable storage medium, the computer-readable storage medium stores instructions, and when the instructions are executed, the computer executes the steps described in the first aspect of the present application and various exemplary manners. method.
  • the eleventh aspect of the present application provides a computer-readable storage medium, the computer-readable storage medium stores instructions, and when the instructions are executed, the computer is caused to execute as described in the second aspect of the present application and each exemplary manner. Methods.
  • a twelfth aspect of the present application provides a computer-readable storage medium, the computer-readable storage medium stores instructions, and when the instructions are executed, the computer executes as described in the third aspect of the present application and various exemplary manners. Methods.
  • a thirteenth aspect of the present application provides a computer program product.
  • the computer program product includes instructions. When the instructions are executed, the computer executes the methods described in the first aspect and each exemplary manner.
  • a fourteenth aspect of the present application provides a computer program product.
  • the computer program product includes instructions that, when executed, cause a computer to execute the methods described in the second aspect and each exemplary manner.
  • a fifteenth aspect of the present application provides a computer program product.
  • the computer program product includes instructions. When the instructions are executed, the computer executes the methods described in the third aspect and each exemplary manner.
  • the sixteenth aspect of the present application provides a system-on-chip or system-on-chip, which can be applied to a first network device, and the system-on-chip or system-on-chip includes: at least one communication interface, at least one processing The communication interface, the memory, and the processor are interconnected by a bus, and the processor executes the instructions stored in the memory so that the first network device can execute the first aspect of the present application and each The method described in an exemplary manner.
  • the seventeenth aspect of the present application provides a system-on-chip or system-on-chip, which can be applied to a second network device, and the system-on-chip or system-on-chip includes: at least one communication interface, at least one processing The communication interface, at least one memory, the communication interface, the memory, and the processor are interconnected by a bus.
  • the processor executes the instructions stored in the memory so that the second network device can execute the second aspect of the present application and each The method described in an exemplary manner.
  • An eighteenth aspect of the present application provides a system on a chip or a system chip, the system on a chip or a system chip can be applied to a terminal device, and the system on a chip or a system chip includes: at least one communication interface, at least one processor, At least one memory, the communication interface, the memory, and the processor are interconnected by a bus, and the processor executes the instructions stored in the memory, so that the terminal device can execute as described in the third aspect of the present application and various exemplary manners. The method described.
  • a nineteenth aspect of the present application provides a communication system, including a first network device, a second network device, and a terminal device, and the first network device is used to execute the method described in the first aspect of the present application and each exemplary manner
  • the second network device is used to execute the method described in the second aspect and each exemplary manner of the present application
  • the terminal device is used to implement the method described in the third aspect and each exemplary manner of the present application.
  • the first network device determines to switch the connected terminal device to the second network device, the second network device is a neighboring cell of the first network device, and the first network device is The network device sends the capability information of the terminal device and the first authentication information, the first authentication information is used by the second network device to perform link authentication on the terminal device, and the first network device receives the access permission information from the second network device, The access permission information is used to indicate that the terminal device is allowed to access the second network device.
  • the first network device sends a second handover command to the terminal device and receives a second handover command response from the terminal device.
  • the first network device sends a state transition command to the second network device, and the second network device sends a first message to the terminal device according to the state transition command, and the first message indicates the link between the second network device and the terminal device
  • the authentication is successful, and the terminal device is associated with the second network device, thereby completing the cell handover.
  • the first network device makes the cell handover decision, so that ping-pong handover can be avoided, and the first network device acts as a proxy for the terminal device to generate authentication information for link authentication and combine the authentication information It is sent to the second network device and the terminal device, thereby saving the air interface signaling for the terminal device to send the authentication information to the second network device, and further shortening the air interface delay during handover.
  • FIG. 1 is a schematic diagram of a communication system to which an embodiment of this application is applicable;
  • Figure 2 is a schematic diagram of the process of STA accessing AP
  • Figure 3 is a schematic diagram of a flow of cell handover
  • Figure 4 is a schematic diagram of another flow of cell handover
  • FIG. 5 is a flowchart of a cell handover method provided in Embodiment 1 of this application.
  • FIG. 6 is a signaling flowchart of a cell handover method provided in Embodiment 2 of this application.
  • Figure 7 is a schematic diagram of supplier-specific content
  • Fig. 8 is a schematic diagram of a measurement report field of a neighboring cell
  • Figure 9 is a schematic diagram of a Radio Measurement Request frame structure
  • FIG. 10 is a signaling flowchart of a cell handover method provided in Embodiment 3 of this application.
  • FIG. 11 is a schematic structural diagram of a first network device provided in Embodiment 4 of this application.
  • FIG. 12 is a schematic structural diagram of a second network device provided in Embodiment 5 of this application.
  • FIG. 13 is a schematic structural diagram of a terminal device provided in Embodiment 6 of this application.
  • FIG. 14 is a schematic structural diagram of a first network device provided in Embodiment 7 of this application.
  • FIG. 1 is a schematic diagram of a communication system to which the embodiments of this application are applicable.
  • the communication system 100 includes: a first network device 10, a second network device 20, and a third network device 30.
  • the elliptical area represents each The coverage or service area of a network device.
  • Each network device can access one or more terminal devices, and the network device can communicate with terminal devices located in the coverage area.
  • the communication system 100 may include more network devices and the coverage of each network device may include other numbers of terminal devices, which is not limited in the embodiment of the present application.
  • the coverage area of the first network device 10 and the coverage area of the second network device 20 have overlapping areas.
  • the coverage area is also called a cell.
  • the first network device 10 and the second network device 20 are adjacent to each other (ie adjacent cells), and the coverage area of the second network device 20 is the same as the coverage area of the third network device 30. With overlapping areas, the second network device 20 and the third network device 30 are adjacent to each other.
  • Figure 1 is only an example. In actual network deployment, a cell may have one neighboring cell or multiple neighboring cells.
  • the communication system 100 may be a global system of mobile communication (GSM) system, code division multiple access (CDMA) system, wideband code division multiple access (WCDMA) system, General Packet Radio Service (GPRS), Long Term Evolution (LTE) System, LTE Frequency Division Duplex (FDD) System, LTE Time Division Duplex (TDD) System , Advanced Long Term Evolution (LTE-A) system, New Radio (NR) system, NR system evolution system, LTE-based access to unlicensed spectrum, LTE- U) system, NR (NR-based access to unlicensed spectrum, NR-U) system on unlicensed frequency bands, universal mobile telecommunication system (UMTS), worldwide interoperability for microwave access, WiMAX) communication systems, wireless local area networks (WLAN), wireless fidelity (WiFi), next-generation communication systems or other communication systems, etc.
  • GSM global system of mobile communication
  • CDMA code division multiple access
  • WCDMA wideband code division multiple access
  • GPRS General Packet Radio Service
  • D2D device to device
  • M2M machine to machine
  • MTC machine type communication
  • V2V vehicle to vehicle
  • the network device 110 may be a base station (Base Transceiver Station, BTS) in a GSM system or a CDMA system, a base station (NodeB, NB) in a WCDMA system, or an evolved base station in an LTE system (Evolutional Node B, eNB or eNodeB), or the wireless controller in the Cloud Radio Access Network (CRAN), or the network equipment can be a mobile switching center, a relay station, an access point, a vehicle-mounted device, Wearable devices, hubs, switches, bridges, routers, network-side devices in 5G networks, or network devices in the future evolution of the Public Land Mobile Network (PLMN), etc.
  • BTS Base Transceiver Station
  • NodeB, NB base station
  • LTE Long Term Evolutional Node B
  • eNB evolved base station
  • CRAN Cloud Radio Access Network
  • the network equipment can be a mobile switching center, a relay station, an access point, a vehicle-mounted device, Wearable devices, hubs, switches
  • the network device 110 may be a (radio access network, (R)AN) device in the NR system, and the (R)AN device in the NR system may be: 3GPP access networks such as the access point (AP) of the WiFi network, the next-generation base station (collectively referred to as the next-generation radio access network node (NG-RAN node), where the next-generation base station includes the new air interface base station ( NR nodeB, gNB), next-generation evolved base station (NG-eNB), central unit (CU) and distributed unit (DU) separated form gNB, etc.), new radio controller (new radio controller) , NR controller), remote radio module, micro base station, relay (relay), transceiver point (transmission receive point, TRP), transmission point (transmission point, TP) or other nodes.
  • 3GPP access networks such as the access point (AP) of the WiFi network
  • the next-generation base station collectively referred to as the next-generation radio access network node (NG-RAN node), where the next-
  • the embodiment of the present application does not limit the specific technology and specific device form adopted by the network device.
  • the above-mentioned devices that provide wireless communication functions for terminal devices are collectively referred to as network devices.
  • the terminal device 120 may be any terminal.
  • the terminal device 120 may be a user equipment for machine-type communication.
  • the terminal device 120 may also be referred to as user equipment (UE), mobile station (mobile station, MS), mobile terminal (mobile terminal), terminal (terminal), and so on.
  • UE user equipment
  • MS mobile station
  • MS mobile terminal
  • terminal terminal
  • the terminal device 120 can communicate with one or more core networks via the RAN. Therefore, the terminal device 120 can also be referred to as a wireless terminal.
  • the wireless terminal can be a device that provides voice and/or data connectivity to users and has a wireless connection. Functional handheld device, or other processing device connected to a wireless modem.
  • the terminal device 120 may be a cellular phone, a cordless phone, a session initiation protocol (session initiation protocol, SIP) phone, a wireless local loop (WLL) station, a personal digital assistant (PDA), Handheld devices with wireless communication functions, computing devices or other processing devices connected to wireless modems, vehicle-mounted devices or wearable devices, virtual reality (VR) terminal devices, augmented reality (AR) terminal devices, industrial control Wireless terminals in (industrial control), wireless terminals in self-driving, wireless terminals in remote medical, wireless terminals in smart grid, and transportation safety
  • the terminal device 120 includes, but is not limited to, connection via a wired line, such as via a public switched telephone network (PSTN), digital subscriber line (Digital Subscriber Line, DSL), digital cable, direct cable connection; and/ Or another data connection/network; and/or via a wireless interface, such as for cellular network, wireless local area network (WLAN), digital TV network such as DVB-H network, satellite network, AM-FM broadcast transmission Device; and/or another terminal device that is set to receive/send communication signals; and/or the Internet of Things (IoT) device.
  • a terminal device set to communicate through a wireless interface may be referred to as a "wireless communication terminal", a "wireless terminal” or a "mobile terminal".
  • Examples of mobile terminals include, but are not limited to, satellite or cellular phones; Personal Communications System (PCS) terminals that can combine cellular radio phones with data processing, fax, and data communication capabilities; can include radio phones, pagers, Internet/intranet PDA with internet access, web browser, memo pad, calendar, and/or Global Positioning System (GPS) receiver; and conventional laptop and/or palmtop receivers or others including radio telephone transceivers Electronic device.
  • PCS Personal Communications System
  • GPS Global Positioning System
  • the network device 110 and the terminal device 120 may be deployed on land, including indoor or outdoor, handheld or vehicle-mounted; also on the water; also on airborne aircraft, balloons, and satellites.
  • the embodiment of the present application does not limit the application scenarios of the network device 110 and the terminal device 120.
  • the network device 110 and the terminal device 120 may communicate through a licensed spectrum, or communicate through an unlicensed spectrum, or communicate through a licensed spectrum and an unlicensed spectrum at the same time.
  • the network device 110 is an AP
  • the terminal device 120 is an STA.
  • APs that are adjacent to each other are controlled by the same access controller (AC) and have the same service set identifier (SSID).
  • AC access controller
  • SSID service set identifier
  • the STA can roam between neighboring cells, that is, handover from one AP to another AP.
  • FIG. 2 is a schematic diagram of the process of STA accessing the AP.
  • the scanning process is used for the STA to discover the wireless network.
  • the STA can actively scan through the Probe Request message or passively scan through the beacon frame Beacon.
  • the link authentication process is used to authenticate the wireless link between the STA and the AP, and only the STA that has passed the link authentication is eligible to establish a wireless link with the AP.
  • the STA After the STA is qualified to establish a wireless link with the AP, it negotiates the service parameters of the wireless link with the AP through the association process to complete the establishment of the wireless link.
  • the STA After the association is completed, it indicates that a wireless link has been established between the STA and the AP. If access authentication is not configured, the STA can access the wireless network normally after obtaining the IP address. If the access authentication is configured, the STA also needs to complete the access authentication and key negotiation stages before it can access the wireless network.
  • the AP can normally provide services for the STA, so the AP is also called the serving AP or serving cell of the STA, and the STA can be called the AP's access ATA or associated STA.
  • the STA when the STA needs to perform a cell handover, the STA measures the signal quality of the current serving AP, and when it detects that the channel quality of the serving AP becomes weak (the specific trigger conditions can be determined by the STA itself), the STA will send a message to the serving AP For a neighbor cell list request, the serving AP feeds back a neighbor cell list with the same SSID to the STA, and the STA selects an AP from the neighbor cell list fed back by the AP as the target AP for cell handover.
  • BSS Basic Service Set
  • FT Fast Basic Service Set
  • Figure 3 is a schematic diagram of a process of cell handover.
  • the cell handover is based on Over the air.
  • the process of accessing the target cell includes:
  • the STA sends an authentication request (Authentication Request) to the target AP.
  • Authentication Request an authentication request
  • Authentication Request includes FTAA, RSNE[PMKR0name], MDE, FTE[SNonce,R0KH-ID].
  • Fast BSS transition authentication algorithm based on BSS.
  • MDE is the Mobility Domain element, which is used to indicate whether Over the air or Over the DS is used.
  • FTE is a Fast BSS Transition element based on BSS.
  • FTE includes integrity protection parameters, random numbers (SNonce) generated by STA, and authentication parameters.
  • ROKH-ID represents the pairwise master key R0 key holder identifier (pairwise master key (PMK) R0 key holder identifier).
  • RSNE stands for Robust Security Network element.
  • PMK is composed of R0 and R1.
  • PMKR0name represents the name of PMKR0, which is used to calculate authentication and encryption keys.
  • the target AP sends an authentication response (Authentication Response) to the STA.
  • Authentication Response an authentication response
  • Authentication Response includes: FTAA, MDE, RSNE[PMKR0name], FTE[Anonce,SNonce,R1KH-ID,R0KH-ID].
  • the target AP serves as R1KH
  • the AC that manages the AP serves as ROKH
  • ROKH-ID represents the identity of the AC
  • R1KH-ID represents the identity of the target AP.
  • the Key (Secret Key) channel between R0KH and R1KH is safe.
  • the FTE has more Anonce and R1KH-ID. Anonce represents the random number generated by the AP, and R1KH-ID represents the identifier of another holder of the PMK.
  • AuthenticationReques and AuthenticationResponse are mainly used for authentication between STA and AP and encryption protection during subsequent data transmission.
  • the STA sends a reassociation request (Reassociation Request) to the target AP.
  • Reassociation Request a reassociation request
  • Reassociation Request includes: RSNE[PMKR1name], MDE, FTE[Anonce,SNonce,R1KH-ID,R0KH-ID].
  • PMKR1name represents the name of PMKR1, which is used to calculate authentication and encryption keys.
  • the target STA sends a re-association response (Reassociation Response) to the STA.
  • Reassociation Response a re-association response
  • Reassociation Response includes FTAA, RSNE[PMKR0name], MDE, FTE[Anonce, SNonce, R1KH-ID, R0KH-ID, GTK].
  • GTK is a group temporal key.
  • S101 and S102 are used for link authentication between AP and STA, and S103 and S104 are used for association between AP and STA.
  • Figure 4 is a schematic diagram of another process of cell handover.
  • the cell handover is based on Over the DS.
  • the process of accessing the target cell includes:
  • the STA sends a fast transition action request (FT Action Request) to the target AP.
  • FT Action Request fast transition action request
  • the FT Action Request includes the ID of the STA, the ID of the target AP, RSNE[PMKR0name], MDE, FTE[SNonce,R0KH-ID].
  • the target AP sends a FT Action Response (FT Action Response) to the STA.
  • FT Action Response FT Action Response
  • the FT Action Response includes: STA identification, target AP identification, RSNE[PMKR0name], MDE, FTE[Anonce, SNonce, R1KH-ID, R0KH-ID].
  • the STA sends a reassociation request (Reassociation Request) to the target AP.
  • Reassociation Request a reassociation request
  • Reassociation Request includes: RSNE[PMKR1name], MDE, FTE[Anonce,SNonce,R1KH-ID,R0KH-ID].
  • the target STA sends a re-association response (Reassociation Response) to the STA.
  • Reassociation Response includes FTAA, RSNE[PMKR0name], MDE, FTE[Anonce, SNonce, R1KH-ID, R0KH-ID, GTK].
  • the STA makes the handover decision.
  • the two access processes are the same, the signaling name is different, and the content of the signaling is slightly different, but the signaling function is the same .
  • the parameters used for authentication included in the signaling refer to the description of the embodiment shown in FIG. 3, which will not be repeated here.
  • the STA makes a cell handover decision, which is prone to produce a ping-pong effect.
  • the ping-pong effect refers to the frequent handover of the STA between two adjacent cells.
  • the measurement of neighboring cell signal quality is not supported during the service process, and the STA performs neighboring cell scanning only after the signal quality of the serving cell deteriorates, which may cause service interruption and switch to the serving cell.
  • the STA needs to re-access the target AP according to the access process, and the handover process is similar to the cell reselection process, resulting in a long handover delay.
  • terminal devices are in communication scenarios such as road traffic and rail transit, such as users in high-speed trains running at high speeds
  • terminal devices such as mobile phones used are in a high-speed movement state, so that terminal devices may frequently move between cells While handover is performed, high-speed movement relatively reduces the time reserved for terminal equipment to switch cells.
  • the handover method in the prior art obviously cannot meet the requirements of high-speed mobile terminal equipment for handover delay.
  • an embodiment of the present application provides a cell handover method, in which a network device makes a handover decision, and the network device can ensure that the terminal device does not undergo a ping-pong handover through an algorithm.
  • the source network device decides to switch the terminal device to the target network device, the source network device sends the authentication information required for the terminal device switching to the target network device, thereby reducing the air interface signaling between the terminal device and the target network device. While reducing the air interface signaling, it can also reduce the handover time and shorten the handover delay.
  • FIG. 5 is a flowchart of a cell handover method provided in Embodiment 1 of this application.
  • This embodiment takes the handover process of a WIFI system as an example.
  • the network device is an AP.
  • the method provided in this embodiment includes The following steps:
  • the first AP determines to switch the accessed STA to the second AP.
  • the second AP is the neighboring cell of the first AP
  • the first AP is the source AP of the STA
  • the second AP is the target AP of the STA
  • the source AP is the AP that the STA is currently accessing
  • the target AP is the AP that the STA is about to hand over.
  • the cell handover decision is made by the first AP.
  • the first AP receives the neighbor cell measurement result of the first AP sent by the STA, and the first AP determines to switch the STA to the second AP according to the neighbor cell measurement result.
  • the first AP may have one or more neighboring cells.
  • the measurement result of the neighboring cell of the first AP includes the identifier of the neighboring cell and the signal quality of the neighboring cell.
  • the signal quality of the neighboring cell can be determined by the reference signal receiving power (Reference Signal Receiving Power, RSRP) characterization.
  • RSRP Reference Signal Receiving Power
  • the RSRP of the neighboring cell is obtained by the STA through smooth filtering, so as to ensure that the RSRP of the neighboring cell will not change hoppingly.
  • the first AP may also decide whether to perform cell handover based on neighboring cell measurement results and other parameters, which is not limited in this embodiment.
  • the first AP sends the STA's capability information and first authentication information to the second AP, where the first authentication information is used by the second AP to perform link authentication on the STA.
  • the STA's capability information includes the STA's MAC address, and the STA's capability information may also include the STA's power level, supported frequency bands, etc., which is not limited in this embodiment.
  • the first authentication information includes all or part of the authentication parameters used for authentication in the Authentication Request in FIG. 3, or the first authentication information includes the authentication parameters used for authentication in the FT Action Request in FIG. 4 All or part of the authentication parameters.
  • the first authentication information only includes the authentication random number (SNonce) in the FT Action Request
  • the second AP may obtain other authentication parameters other than the authentication random number in the FT Action Request by other methods.
  • the authentication parameter ROKH-ID can be carried in the first authentication information and sent by the first AP to the second AP, or it can be pre-configured in the second AP, or after the second AP receives the first authentication information , Obtain the ROKH-ID from a third-party device.
  • the authentication random number in the first authentication information is generated by the first AP and sent to the second AP.
  • the authentication random number is generated by the STA, and the first AP acts as a proxy instead of the STA to generate authentication.
  • Weight random number is generated by the STA, and the first AP acts as a proxy instead of the STA to generate authentication.
  • the parameters in the first authentication information can be used for link authentication, but can also be used for other purposes. For example, they can be used for secret key calculation, and the calculated secret key is used for data communication between the STA and the second AP. Encryption protection.
  • the STA's capability information and the first authentication information are sent by the first AP to the second AP.
  • the STA's capability information and the first authentication information are usually sent by the STA to the second AP.
  • the air interface signaling of the STA can be saved.
  • the capability information of the STA and the first authentication information may be sent to the second AP through one signaling or message, or may be sent to the second AP through multiple signaling or messages, which is not limited in this embodiment.
  • the capability information of the STA and the first authentication information are carried in the first handover command.
  • the first handover command is used to request the second AP to switch the STA to the second AP.
  • the first handover command may be, but not limited to, Handover. Commend.
  • the first AP receives access permission information from the second AP, where the access permission information is used to instruct the second AP to allow the STA to access the second AP.
  • the second AP After the second AP receives the STA's capability information and the first authentication information sent by the first AP, it decides whether to allow the STA to access the second AP according to the STA's capability information, the first authentication information and its own strategy. Exemplarily, both the capability information of the STA and the first authentication information meet the handover requirements, but the current load of the second AP is large, the second AP may refuse the STA to access, and if the current load of the second AP is small, the STA is allowed Access. Alternatively, the second AP judges that the interval between the previous access time of the STA and the current time when the STA accesses the second AP is smaller according to the access information of the STA that is automatically saved. For example, if the interval is less than the first interval, it is rejected For STA access, if the interval time is greater than or equal to the first interval time, the STA is allowed to access.
  • the second AP generates access permission information.
  • the access permission information is used to indicate that the STA is allowed or not allowed to access the second AP.
  • step S304 is performed.
  • the permission information is used to indicate that when the STA is not allowed to access, the handover procedure is ended.
  • the second AP may carry the access permission information in the first handover command response and send it to the first AP.
  • the first handover command response is Handover Commend Response.
  • the first handover command response also includes capability information of the second AP.
  • the first AP may obtain the capability information of the second AP in other ways.
  • the two APs exchange information through the controlled wireless access point and the configuration protocol (Control And Provisioning of Wireless Access Points Protocol Specification, CAPWAP), the first handover command and the first handover between the first AP and the second AP
  • the command response is carried as the payload of the CAPWAP frame.
  • S304 The first AP sends a second handover command to the STA.
  • the first AP sends a second handover command to the STA.
  • the second handover command is used to instruct the STA to switch to the second AP.
  • the second handover command includes second authentication information, the second authentication information includes an authentication random number, and the second authentication information includes an authentication random number. It is the same as the authentication random number included in the first authentication information.
  • the second authentication information can be used to calculate the secret key used for encryption between the STA and the second AP.
  • the second handover command also includes capability information of the second AP.
  • the second handover command may be a BSS Transition Management Request (BSS Transition Management Request).
  • the first AP receives a second handover command response from the STA, where the second handover command response is used to indicate that the STA is ready for handover.
  • the STA After receiving the second handover command, the STA determines whether to access the second AP according to the second handover command.
  • the second handover command response is BSS Transition Management Response
  • the first AP sends a status transfer (status transfer) command to the second AP, where the status transfer command is used to indicate that the STA is ready for handover.
  • a status transfer status transfer
  • the first AP When the second handover command indicates that the STA is ready for handover, the first AP sends a state transition command to the second AP.
  • the state transition command is used to notify the STA that the STA is ready for handover.
  • Send a first message to the STA the first message is used to indicate that the second AP has successfully authenticated the link with the STA.
  • the STA After receiving the first message, the STA associates with the second AP to complete the cell handover.
  • the first AP determines to switch the accessed STA to the second AP.
  • the second AP is the neighboring cell of the first AP.
  • the first AP sends the STA's capability information and the first authentication information to the second AP.
  • the first authentication information is used by the second AP to authenticate the STA.
  • the first AP receives access permission information from the second AP.
  • the access permission information is used to indicate that the STA is allowed to access the second AP.
  • the STA sends a second handover command and receives a second handover command response from the STA. When the second handover command response indicates that the STA is ready for handover, the first AP sends a state transition command to the second AP.
  • the state transition command is used to indicate The STA is ready for handover.
  • the first AP makes the cell handover decision, which can avoid ping-pong handover, and the first AP acts as a proxy for the STA to generate authentication information for link authentication and send the authentication information to the first AP.
  • Two APs and STAs thereby saving air interface signaling for the STA to send authentication information to the second AP, and further shortening the air interface delay during handover.
  • the method of the embodiment of the present application can reduce the air interface delay of the STA handover, so that the STA can quickly handover to the target AP, and ensure that the STA's service data packets will not be lost.
  • FIG. 6 is a signaling flowchart of the cell handover method provided in the second embodiment of this application. This embodiment still uses the WIFI system as an example. As shown in FIG. 6, the method provided in this embodiment includes The following steps:
  • S401 The STA performs neighbor cell measurement.
  • the STA performs the neighbor cell measurement according to the neighbor cell measurement configuration sent by the first AP, and the neighbor cell measurement configuration is used to configure the neighbor cell of the first AP and the measurement resource of the neighbor cell.
  • the neighbor cell measurement configuration may be carried by the first AP in an association response (association response) frame or a reassociation response (reassociation response) frame and sent to the STA.
  • the neighbor cell measurement configuration is carried. There is no need for dedicated signaling to carry the neighbor cell measurement configuration, which saves network resources. After the terminal is connected, the neighbor cell measurement can be started without special activation. instruct.
  • the association response and the reason response include the vendor specific (Vendor Specific) field, and the neighbor cell measurement configuration can be carried in the Vendor Specific field.
  • FIG. 7 is a schematic diagram of vendor specific content. As shown in FIG. 7, vendor specific content includes content ID, length, and vendor specific field. Content ID and Length occupies 8 bits each, and the length of Vendor Specific field is variable.
  • the Vendor Specific field includes the following parameters: Offset, carrier coefficient k, interval time (Rptinterval), number of neighboring cells M, BSSID, operating class (Operating Class), channel number (Channel Number), beacon frame Offset (Beacon offset) and padding (Padding).
  • BSSID, Operating Class, Channel Number, and Beacon offset are the parameters of a neighboring cell
  • the Vendor Specific field includes the parameters of M neighboring cells.
  • the STA can determine the signal quality of the neighboring cell based on smoothing filtering, so the neighboring cell configuration information includes the filter factor k.
  • Operating Class and Channel Number have a corresponding relationship with frequency. STA can determine the measurement frequency of the neighboring cell based on the corresponding relationship, and determine the measurement time of the neighboring cell based on the Beacon offset.
  • the AP configures the measurement time for the STA, and the STA performs measurement according to the measurement time. Therefore, the neighbor cell measurement can also be performed while the service is in progress.
  • the STA After the STA starts the measurement process, it measures the signal quality Ms of the cell and the signal quality M n of the neighboring cell, and performs smoothing filtering processing.
  • F n represents the signal quality of the nth neighboring cell (ie the measurement result)
  • F n-1 represents the signal quality of the n-1th neighboring cell
  • M n represents the nth instantaneous neighboring cell signal quality
  • k is the filter factor.
  • the STA smoothes and filters the measured instantaneous neighboring cell signal quality so that the neighboring cell signal quality does not undergo jump mutations, thereby avoiding ping-pong handover.
  • the STA sends a neighboring cell measurement result to the first AP.
  • the neighboring cell measurement result of the neighboring cell is reported.
  • the reporting condition is Ms-M n >offset, where the signal quality of the current cell Ms and the neighboring cell's
  • the signal quality M n is an instantaneous measurement value
  • the neighboring cell signal quality included in the neighboring cell measurement result is the signal quality after filtering.
  • the neighbor cell measurement result can be carried in a radio measurement action frame (Radio Measurement action), which includes a Neighbor Measurement Report field, and the neighbor cell measurement result can be carried in a neighbor cell measurement report field.
  • Radio Measurement action which includes a Neighbor Measurement Report field
  • the neighbor cell measurement result can be carried in a neighbor cell measurement report field.
  • the neighboring cell measurement report field includes: Category, handover measurement report and handover measurement report unit.
  • the handover measurement report unit includes the number of reported cells M, local The RSRP of the cell, the BSSID of the neighboring cell, and the RSRP of the neighboring cell.
  • the handover measurement report unit includes the BSSID and RSRP of M neighboring cells, and RSRP is the signal quality of the cell.
  • the first AP may send Neighbor Measurement Update (Neighbor Measurement Update) information to the STA, and the neighboring cell measurement update information is used to update the neighboring cell of the first AP.
  • Neighbor Measurement Update Neighbor Measurement Update
  • the neighbor cell measurement update information is carried in a radio measurement request (Radio Measurement Request) frame.
  • the wireless measurement request frame includes a neighbor cell measurement update field, and the neighbor cell measurement update information is carried in the neighbor cell measurement update field.
  • the Radio Measurement Request also includes a Neighbor Measurement Stop field and/or a measurement pause indication, and the Neighbor Measurement Stop field carries neighbor cell measurement stop information and neighbor cell measurement stop information Used to instruct to stop measuring the neighboring area.
  • the measurement pause indicates that the neighbor cell measurement is no longer performed within the set time and the measurement result is reported.
  • Table 3 is a schematic diagram of the value of the measurement type included in the Radio Measurement Request.
  • Figure 9 is a schematic diagram of the Radio Measurement Request frame structure.
  • Flag represents a neighbor cell update indication.
  • the value of flag can be the first preset value or the second preset value. When the value of flag is the first When the default value is used, it means that a neighboring cell is added, and when the value of flag is the second preset value, it means that the neighboring cell is deleted.
  • the first preset value is 1, the second preset value is 0, or the first preset value is true, the second preset value is false, of course, the first preset value and the second preset value
  • the value can also be other values, which will not be listed here.
  • the value of the first flag is 1, the M cells after the first flag are newly added neighboring cells, and the number of cells after M is the configuration information of the M cells in sequence, and the configuration information of each cell includes BSSID, operation level, number of channels, and beacon frame offset.
  • the value of the second flag is 0, the N cells after the second flag are deleted cells, and the number of cells after N is the BSSID of the N cells in sequence.
  • S403 The first AP makes a cell handover decision.
  • the first AP determines to switch the STA to the second AP according to the neighboring cell measurement result.
  • the first AP sends a first handover command to the second AP.
  • the first handover command includes the capability information of the STA and the first authentication information.
  • the first authentication information is used to instruct the second AP to perform link authentication for the STA.
  • the first authentication information includes the authentication generated by the first AP. random number.
  • the second AP sends a first handover command response to the first AP.
  • the first handover command response includes access permission information, and the access permission information is used to indicate whether the STA is allowed or not allowed to access the second AP.
  • the first handover command response also includes capability information of the second AP.
  • S406 The first AP sends a second handover command to the STA.
  • the second handover command is used to instruct the STA to switch to the second AP.
  • the second handover command includes the second authentication information, and the second authentication information includes the authentication random number generated by the first AP.
  • the second handover command also includes capability information of the second AP, and the capability information of the second AP included in the second handover command may be sent by the second AP in response to the first handover command, or may be the first handover command.
  • the AP is obtained through other means.
  • the STA sends a second handover command response to the first AP.
  • the STA After the STA receives the second handover command, if the STA determines to switch to the second AP, it sends a second handover command response to the first AP.
  • the second handover command response is used to indicate that the STA is ready for handover.
  • the STA waits for the first message unicasted by the second AP to the STA according to the channel number of the second AP. If the second handover command response indicates that the STA is not ready for handover, the handover procedure is ended, and the STA starts the initial access procedure.
  • the second handover command response sent by the STA to the first AP is used to indicate that the STA is not ready for handover, or the STA does not send the second handover command to the first AP
  • the second handover command response is not received within the preset time, it is determined that the STA is not ready for handover.
  • S408 The first AP sends a state transition command to the second AP.
  • the first AP When the second handover command response indicates that the STA is ready for handover, the first AP sends a state transition command to the second AP, and the state transition command is used to indicate that the STA is ready for handover.
  • S409 The second AP sends the first message to the STA.
  • the first message is used to indicate that the link between the second AP and the STA is successfully authenticated.
  • the first message is the first message unicasted by the second AP to the STA.
  • the first message may be an FT Action Response or an authentication response.
  • the specific message of the first message may be different.
  • the STA sends a re-association request to the second AP.
  • S411 The second AP sends a re-association response to the STA.
  • the first AP determines to switch the STA to the second AP, it sends the authentication information required for the authentication of the second AP to the second AP through the channel between the first AP and the second AP.
  • the authentication information needs to be sent by the STA to the second AP, thereby saving air interface signaling of the STA and shortening the air interface delay in the handover process.
  • the cell handover process in this embodiment can save the interaction time of 3 subframes. If the duration of each subframe is 3ms, the air interface delay of 6ms can be shortened.
  • Figure 10 is a signaling flow chart of the cell handover method provided in the third embodiment of this application. This embodiment is based on the second embodiment. After S406, that is, after the first AP sends the second handover command to the STA, the first AP and During the second, data forwarding of the STA is performed, so as to ensure that the downlink data of the STA will not be lost during the handover process.
  • path switching may also be performed between the first AP and the second AP.
  • This embodiment takes the Over the DS switching process as an example for description. As shown in FIG. 10, the method provided in this embodiment includes the following steps.
  • S501 The STA performs neighbor cell measurement.
  • the STA sends a measurement report to the first AP.
  • the measurement report includes the neighboring cell measurement results.
  • S503 The first AP makes a cell handover decision.
  • the first AP determines to switch the STA to the second AP according to the neighboring cell measurement result.
  • the first AP sends a handover request (Handover Commend) to the second AP.
  • Handover Commend is the first handover command, which is used to request to switch the STA to the second AP.
  • the Handover Commend includes the message content of the target AP in the FT Action Request message that the STA needs to send.
  • the Handover Commend includes STA capability information and authentication random numbers.
  • S505 The second AP sends a handover request response (Handover Commend Response) to the first AP.
  • a handover request response Handover Commend Response
  • the Handover Commend Response is the first handover command response.
  • the Handover Commend Response includes access permission information, and optionally, it may also include the capability information of the second AP.
  • S506 The first AP sends a BSS Transition Management Request (BSS Transition Management Request) to the STA.
  • BSS Transition Management Request BSS Transition Management Request
  • the BSS Transition Management Request is the second handover command, which is used to instruct the STA to switch to the second AP.
  • the BSS Transition Management Request includes an authentication random number, and optionally, also includes the capability information of the second AP.
  • BSS Transition Management Request is referred to as Handover Request.
  • S507 The first AP and the second AP perform data forwarding of the STA.
  • Data forwarding is to send the downlink data that the first AP has not sent to the STA to the second AP, so that after the STA accesses the second AP, the second AP can send the downlink data to the STA, thereby ensuring that during the cell handover process , STA's downlink data will not be lost.
  • FIG. 10 is only a schematic diagram, and one message or multiple messages may be exchanged during the data forwarding process, which is not limited in this embodiment.
  • the STA sends a BSS Transition Management Response (BSS Transition Management Response) to the first AP.
  • BSS Transition Management Response BSS Transition Management Response
  • BSS Transition Management Response is Handover Response
  • BSS Transition Management Response is the second handover command response
  • BSS Transition Management Request and BSS Transition Management Response are handover signaling in the 802.11v protocol. It can be understood that the method in the embodiment of this application is also applicable For other protocol versions, correspondingly, the specific message name of the handover signaling will change, but the function is similar.
  • S509 The first AP sends a state transition command to the second AP.
  • the first AP sends a state transition command to the second AP, and the state transition command is used for the STA to be ready for handover. If the BSS Transition Management Response indicates that the STA is not ready for handover, the STA starts the initial access procedure.
  • the second AP sends a FT Action Response (FT Action Response) to the STA.
  • FT Action Response FT Action Response
  • the second AP After the second AP determines that the STA is ready to switch, it sends the FT Action Response to the STA.
  • the FT Action Response is the first message
  • the FT Action Response is the first message sent by the second AP to the STA.
  • the STA sends the BSS Transition Management to the first AP.
  • the STA waits for the FT Action Response according to the number of channels of the second AP, and the FT Action Response indicates that the second AP has successfully authenticated the link with the STA.
  • the STA sends a reassociation request (Reassociation Request) to the second AP.
  • Reassociation Request a reassociation request
  • the second AP sends a reassociation response (Reassociation Response) to the STA.
  • the content of the FT Action Response, Response Request, and Response Response messages are the same as those defined in the existing standards, and will not be repeated here.
  • the second AP completes the link authentication with the STA according to the BSS Transition Management Request sent by the first AP in step S506 and the FT Action Response sent by the second AP in S510.
  • the STA and the second AP complete the association through the re-association process, the handover process is over, and the STA and the second AP can communicate.
  • the second AP can send the forwarded data of the STA to STA, so as to ensure that the STA's downlink data will not be lost during the handover process.
  • the second AP sends a path handover command (Traffic Path Handover) to the first AP.
  • a path handover command Traffic Path Handover
  • the path switching command is used to instruct the STA to update routing information.
  • the second AP sends a path switching command to the first AP, and the first AP updates the local routing information of the STA according to the path switching command.
  • S514 The first AP sends a path handover response (Traffic Path Handover Response) to the second AP.
  • a path handover response Traffic Path Handover Response
  • the response of the path switching command is used to indicate the success or failure of the routing information update.
  • the second AP sends a user context release command (UE context release) to the first AP.
  • UE context release a user context release command
  • the user context release command is used to instruct the first AP to release the stored user context of the STA.
  • the user context release command is sent by the second AP after receiving a path switching response indicating that the routing information has been updated successfully. Command to release the user context of the STA.
  • steps S513 and S514 are optional steps.
  • the second AP may also directly send a user context release command to the first AP.
  • the authentication information required by the second AP for link authentication is sent to the second AP through the Handover Commend message, without the need for the STA to receive the authentication information.
  • the authentication information is sent to the second AP through the FT Action Request, thereby saving air interface signaling of the STA and shortening the air interface delay in the handover process. Since the STA does not need to send the FT Action Request to the second AP, the first unicast message between the second AP and the STA is the FT Action Response.
  • the cell handover process in this embodiment can save up to 3 subframes of interaction time. It is assumed that after the first AP decides to perform cell handover, the first AP does not send authentication information to the second AP, but the STA sends it to the second AP. Authentication information, then the switching time is: 7*subframe length+Q+X+Y+Z+W+P.
  • msg1 is an uplink OFDMA (Uplink OFDMA-based Random Access, UORA) Tirigger based on random access.
  • UORA trigger is an uplink scheduling frame used to indicate the contention resource information used by unassociated STAs for access.
  • X The time from when the probe request (Probe Request) is received on the air interface of the target AP to the probe response (Probe response) can be delivered to the air interface.
  • the Probe Request is used by the STA to actively scan and discover the wireless network. If handover optimization is not performed, the STA sends a Probe Request to the target AP after receiving the handover command sent by the source AP, and the target AP returns a Probe response after receiving the Probe Request.
  • Y The time from when the STA receives the Probe Response to when it can send the FT Action Request (it is considered that the target AP can send a UORA trigger at any time after the Probe response is sent). If the STA has sufficient capacity, Y can be 0.
  • W The time from when the STA receives the FT Action Response to when it can send a Response Request (it is considered that the target AP can send a UORA trigger at any time after the FT Action Response is sent). If the STA has sufficient capabilities, W can be 0.
  • P The time from when the target AP receives the Reassociation Request to when it can deliver the response to the air interface.
  • S The time from when the source AP receives the Handover Response to when the target AP can send an FT Action Response. S can be 0 if the AP has sufficient capabilities.
  • the switching time can be shortened to 4*subframe length+S+W+P, and 4*subframe length+W+P is relative to 7*subframe length+Q+X+Y+Z+
  • the shortening time of W+P is 3*subframe length+Q+X+Y+ZS.
  • This embodiment takes the Over the DS switching process as an example for description.
  • the above switching process is also applicable to Over the air.
  • the two switching processes are the same, except that the message name and content are slightly different, but the message function It is the same, this application will not elaborate.
  • FIG. 11 is a schematic structural diagram of the first network device provided in the fourth embodiment of the application.
  • the first network device 100 of this embodiment includes: a determining module 11, configured to determine whether to remove the terminal device from the first network device Switch to the second network device; the sending module 12 is used to send the capability information of the terminal device and the first authentication information to the second network device, where the first authentication information is used for the second network device Perform link authentication on the terminal device; the receiving module 13 is configured to receive access permission information from the second network device, where the access permission information is used to indicate that the terminal device is allowed to access the second network device.
  • the sending module 12 is also used to send a second switching command to the terminal device, the second switching command is used to instruct the terminal device to switch to the second network device, the second switching The command includes second authentication information; the receiving module 13 is further configured to receive a second handover command response from the terminal device, and the second handover command response is used to indicate that the terminal device is ready for handover; The sending module 12 is further configured to send a state transition command to the second network device, where the state transition command is used to indicate that the terminal device is ready for handover.
  • the first authentication information includes an authentication random number, and the authentication random number is generated by the first network device.
  • the second authentication information includes the authentication random number.
  • the sending module 12 sending the capability information of the terminal device and the first authentication information to the second network device includes: sending a first handover command to the second network device,
  • the first handover command includes the capability information of the terminal device and the first authentication information;
  • the receiving module 13 receives the access permission information from the second network device, including: receiving from the second network device A first handover command response, where the first handover command response includes the access permission information.
  • the receiving module 13 is further configured to receive a path switch command from the second network device after the terminal device accesses the second network device, and the path switch command is used To instruct the terminal device to update routing information; the sending module 12 is further configured to send a path switch command response to the second network device, and the path switch command response is used to indicate the success or failure of the routing information update.
  • a data forwarding module configured to perform data forwarding of the terminal device with the second network device.
  • the receiving module 13 is further configured to: receive a neighboring cell measurement result of the first network device from the terminal device; the determining module 11 is specifically configured to: measure according to the neighboring cell As a result, it is determined to switch the terminal device to the second network device.
  • the first network device in this embodiment may be used to execute the method steps performed by the first network device or the first AP in the foregoing method embodiment.
  • the specific implementation manner and technical effect are similar, and details are not described herein again.
  • FIG. 12 is a schematic structural diagram of a second network device according to Embodiment 5 of this application.
  • the second network device 200 of this embodiment includes: a receiving module 21, configured to receive information from the first network device of the terminal device Capability information and first authentication information, the terminal device has accessed the first network device, and the first authentication information is used by the second network device to perform link authentication on the terminal device; sending The module 22 is configured to send access permission information to the first network device, where the access permission information is used to indicate that the terminal device is allowed to access the second network device; the receiving module 21 is also used to Receive a state transition command from the first network device, the state transition command is used to indicate that the terminal device is ready for handover; the sending module 22 is also used to send a first message to the terminal device, so The first message is used to indicate that the link between the second network device and the terminal device is successfully authenticated; the association module 23 is used to associate the second network device with the terminal device.
  • the association module 23 is specifically configured to: receive a re-association request from the terminal device; and send a re-association response to the terminal device.
  • the first authentication information includes an authentication random number, and the authentication random number is generated by the first network device.
  • the receiving module 21 receiving the capability information of the terminal device and the first authentication information from the first network device includes: receiving a handover request from the first network device, and the handover request includes The capability information of the terminal device and the first authentication information;
  • the sending module 22 sending the access permission information to the first network device includes: sending a handover request response to the first network device, the The handover request response includes the access permission information.
  • the first message is an authentication response or a quick conversion action response.
  • the sending module 22 is further configured to send a path switch command to the first network device after the second network device is associated with the terminal device, and the path switch command is used To instruct the terminal device to update routing information; the receiving module 21 is further configured to receive a path switching command response from the first network device, and the path switching command response is used to indicate the success or failure of the routing information update.
  • a data forwarding module configured to perform data forwarding of the terminal device with the first network device.
  • the second network device in this embodiment may be used to execute the method steps performed by the second network device or the second AP in the foregoing method embodiment.
  • the specific implementation manner and technical effect are similar, and details are not described herein again.
  • FIG. 13 is a schematic structural diagram of a terminal device provided by Embodiment 6 of this application.
  • the terminal device 300 of this embodiment includes: a receiving module 31, configured to receive a second handover command from a first network device.
  • the second switching command is used to instruct the terminal device to switch to the second network device, and the second switching command includes second authentication information;
  • the sending module 32 is used to send the second switching command to the first network device In response, the second handover command response is used to indicate that the terminal device is ready for handover;
  • the receiving module 31 is also used to receive a first message sent by the second network device, and the first message is used for To indicate that the second network device and the terminal device have successfully authenticated the link;
  • the associating module 33 is configured to associate the terminal device with the second network device in response to the first message.
  • the association module 33 is specifically configured to: send an association request to the second network device; and receive an association response from the second network device.
  • the first message is an authentication response or a quick conversion action response.
  • it further includes: a measurement module, configured to perform neighboring cell measurement according to a neighboring cell measurement configuration; and the sending module 32 is further configured to send a neighboring cell measurement result to the first network device.
  • the receiving module 31 is further configured to: receive the neighboring cell measurement configuration from the first network device, and the neighboring cell measurement configuration is used to configure the neighboring cell of the first network device. And the measurement resources of the neighboring area.
  • the sending module 32 sending the neighbor cell measurement result to the first network device includes: sending a wireless measurement action frame to the first network device, and the wireless measurement action frame includes all The neighboring cell measurement report field, and the neighboring cell measurement result is carried in the neighboring cell measurement report field.
  • the receiving module 31 receiving the neighbor cell measurement configuration from the first network device includes: receiving an association response or a re-association response from the first network device, the association response or The re-association response includes the neighboring cell measurement configuration.
  • the association response or the re-association response includes a supplier-specific domain, and the neighboring cell measurement configuration is carried in the supplier-specific domain.
  • the receiving module 31 is further configured to: receive neighbor cell measurement update information from the first network device, and the neighbor cell measurement update information is used to update the neighbor cell of the first network device. .
  • the receiving module 31 receiving neighbor cell measurement update information from the first network device includes: receiving a wireless measurement request frame from the first network device, and the wireless measurement request frame includes A neighbor cell measurement update field, where the neighbor cell measurement update information is carried in the neighbor cell measurement update field.
  • the wireless measurement request frame further includes a neighbor cell measurement stop field, and the neighbor cell measurement stop field carries neighbor cell measurement stop information, and the neighbor cell measurement stop information is used to instruct to stop measuring the neighbor cell. .
  • the terminal device of this embodiment can be used to execute the method steps performed by the terminal device in the foregoing method embodiment.
  • the specific implementation manner and technical effect are similar, and details are not described herein again.
  • FIG. 14 is a schematic structural diagram of the first network device provided in the seventh embodiment of the application.
  • the first network device 400 in this embodiment includes a processor 41, a memory 42 and a transceiver 43.
  • the memory 42 Used to store instructions, the memory 42 and the transceiver 43 are connected to and communicate with the processor 41 through a bus.
  • the transceiver 43 is used to send and receive data, and the processor 41 is used to execute the instructions stored in the memory 42.
  • the specific implementation manner and technical effect are similar, and details are not described herein again.
  • the eighth embodiment of the present application provides a second network device.
  • the second network device includes a processor, a memory, and a transceiver.
  • the memory is used for Store instructions
  • the transceiver is used to communicate with other devices
  • the processor is used to execute the instructions stored in the memory, so that the second network device executes the method performed by the second network device in the method embodiment of the present application.
  • the ninth embodiment of the present application provides a terminal device.
  • the terminal device includes a processor, a memory, and a transceiver.
  • the memory is used to store instructions.
  • the transceiver is used to communicate with other devices, and the processor is used to execute instructions stored in the memory, so that the terminal device executes the method steps performed by the terminal device in the method embodiment of this application.
  • the specific implementation and technical effects are similar , I won’t repeat it here.
  • the processor used by the network device or terminal device in this application can be a central processing unit (CPU), a general-purpose processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) ) Or other programmable logic devices, transistor logic devices, hardware components or any combination thereof. It can implement or execute various exemplary logical blocks, modules, and circuits described in conjunction with the disclosure of this application.
  • the processor may also be a combination for realizing computing functions, for example, including a combination of one or more microprocessors, a combination of a DSP and a microprocessor, and so on.
  • the bus described in this application may be an Industry Standard Architecture (ISA) bus, a Peripheral Component (PCI) bus, or an Extended Industry Standard Architecture (EISA) bus, etc.
  • ISA Industry Standard Architecture
  • PCI Peripheral Component
  • EISA Extended Industry Standard Architecture
  • the bus can be divided into address bus, data bus, control bus and so on.
  • the buses in the drawings of this application are not limited to only one bus or one type of bus.
  • the disclosed device and method may be implemented in other ways.
  • the device embodiments described above are merely illustrative.
  • the division of the units is only a logical function division, and there may be other divisions in actual implementation, for example, multiple units or components may be combined or It can be integrated into another system, or some features can be ignored or not implemented.
  • the displayed or discussed mutual coupling or direct coupling or communication connection may be indirect coupling or communication connection through some interfaces, devices or units, and may be in electrical, mechanical or other forms.
  • the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the objectives of the solutions of the embodiments.
  • the functional units in the various embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units may be integrated into one unit.
  • the above-mentioned integrated unit may be implemented in the form of hardware, or may be implemented in the form of hardware plus software functional units.
  • the above-mentioned integrated unit implemented in the form of a software functional unit may be stored in a computer readable storage medium.
  • the above-mentioned software functional unit is stored in a storage medium, and includes one or more instructions to make a computer device (which can be a personal computer, a server, or a network device, etc.) or a processor (English: processor) to execute each implementation of this application Some steps of the method described in the example.
  • the aforementioned storage media include: U disk, mobile hard disk, read-only memory (English: Read-Only Memory, abbreviated as: ROM), random access memory (English: Random Access Memory, abbreviated as: RAM), magnetic disk or optical disk, etc.
  • ROM Read-Only Memory
  • RAM Random Access Memory
  • magnetic disk or optical disk etc.
  • the various embodiments in this application are described in a progressive manner, and the same or similar parts between the various embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments.
  • the description is relatively simple, and for related parts, please refer to the part of the description of the method embodiment.
  • the device embodiments described above are merely illustrative.
  • the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in One place, or it can be distributed to multiple network units. Some or all of the modules can be selected according to actual needs to achieve the objectives of the solutions of the embodiments.

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  • Mobile Radio Communication Systems (AREA)

Abstract

L'invention concerne un procédé et un appareil de commutation de cellule. Le procédé comprend les étapes au cours desquelles : un premier dispositif de réseau prend une décision de commutation de cellule et envoie des informations permettant une authentification de liaison à un second dispositif de réseau et à un dispositif terminal ; le premier dispositif de réseau envoie une seconde instruction de commutation au dispositif terminal et reçoit du dispositif terminal une réponse visant à indiquer que le dispositif terminal est prêt pour une commutation ; puis le premier dispositif de réseau envoie une instruction de transition d'état au second dispositif de réseau et le second dispositif de réseau envoie, en fonction de l'instruction de transition d'état, un premier message visant à indiquer au dispositif terminal que l'authentification de liaison est réussie, le dispositif terminal étant associé au second dispositif de réseau. Un premier dispositif de réseau prend une décision de commutation de cellule, ce qui permet d'éviter une commutation en alternance. Le premier dispositif de réseau génère des informations d'authentification permettant une authentification de liaison. Les informations d'authentification sont envoyées à un second dispositif de réseau et à un dispositif terminal. Ainsi est-il possible d'économiser une signalisation d'interface radio associée au dispositif terminal qui envoie les informations d'authentification au second dispositif de réseau. Par conséquent, un retard d'interface radio pendant une commutation est également raccourci.
PCT/CN2020/080143 2020-03-19 2020-03-19 Procédé et appareil de commutation de cellule WO2021184281A1 (fr)

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