WO2019228191A1 - 一种通信方法、装置及系统 - Google Patents

一种通信方法、装置及系统 Download PDF

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Publication number
WO2019228191A1
WO2019228191A1 PCT/CN2019/087210 CN2019087210W WO2019228191A1 WO 2019228191 A1 WO2019228191 A1 WO 2019228191A1 CN 2019087210 W CN2019087210 W CN 2019087210W WO 2019228191 A1 WO2019228191 A1 WO 2019228191A1
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WO
WIPO (PCT)
Prior art keywords
terminal
station
secondary station
information
communication device
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PCT/CN2019/087210
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English (en)
French (fr)
Inventor
王瑞
戴明增
彭文杰
Original Assignee
华为技术有限公司
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Publication date
Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to EP19812048.7A priority Critical patent/EP3790355A4/en
Publication of WO2019228191A1 publication Critical patent/WO2019228191A1/zh
Priority to US17/104,754 priority patent/US11606731B2/en
Priority to US18/170,768 priority patent/US20230276312A1/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/20—Manipulation of established connections
    • H04W76/27—Transitions between radio resource control [RRC] states
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W12/00—Security arrangements; Authentication; Protecting privacy or anonymity
    • H04W12/04—Key management, e.g. using generic bootstrapping architecture [GBA]
    • H04W12/041—Key generation or derivation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W12/00—Security arrangements; Authentication; Protecting privacy or anonymity
    • H04W12/06—Authentication
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W12/00—Security arrangements; Authentication; Protecting privacy or anonymity
    • H04W12/10—Integrity
    • H04W12/106—Packet or message integrity
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W12/00—Security arrangements; Authentication; Protecting privacy or anonymity
    • H04W12/30—Security of mobile devices; Security of mobile applications
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0055—Transmission or use of information for re-establishing the radio link
    • H04W36/0072—Transmission or use of information for re-establishing the radio link of resource information of target access point
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • H04W74/0833—Random access procedures, e.g. with 4-step access
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/15—Setup of multiple wireless link connections
    • H04W76/16—Involving different core network technologies, e.g. a packet-switched [PS] bearer in combination with a circuit-switched [CS] bearer
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/19—Connection re-establishment
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0011—Control or signalling for completing the hand-off for data sessions of end-to-end connection
    • H04W36/0033—Control or signalling for completing the hand-off for data sessions of end-to-end connection with transfer of context information
    • H04W36/0038—Control or signalling for completing the hand-off for data sessions of end-to-end connection with transfer of context information of security context information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0055—Transmission or use of information for re-establishing the radio link
    • H04W36/0069—Transmission or use of information for re-establishing the radio link in case of dual connectivity, e.g. decoupled uplink/downlink
    • H04W36/00698—Transmission or use of information for re-establishing the radio link in case of dual connectivity, e.g. decoupled uplink/downlink using different RATs
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/18—Self-organising networks, e.g. ad-hoc networks or sensor networks
    • H04W84/20—Master-slave selection or change arrangements

Definitions

  • the embodiments of the present application relate to the field of communication technologies, and in particular, to a communication method, device, and system.
  • 5G UE User equipment (User Equipment) in the 5th Generation Communication Mobile Technology (5G) system, referred to as 5G UE, can be in radio resource control (RRC) idle mode (Idle mode) , RRC connected state (Connected mode) or third state.
  • RRC radio resource control
  • the third state can also be called inactive state (RRC Inactive mode).
  • RRC radio resource control
  • both the 5G UE and the Radio Access Network (RAN) device store the AS context of the 5G UE
  • the core network device stores the context of the 5G UE, the core network device, and the There is a 5G UE-specific signaling connection (UE connection) between RAN devices.
  • UE connection There is no RRC connection between 5G UE and RAN equipment.
  • the RAN device stores the AS context of the 5G UE, which can speed up the 5G UE's return to the connected state and perform data transmission quickly.
  • gNB a base station using a New Radio (NR) in a 5G system
  • NGC Next-Generation Core
  • the master station configures a new secondary station for the 5G UE, that is, the primary station needs to reconfigure the secondary cell group (Secondary Cell Group, SCG).
  • SCG Secondary Cell Group
  • the embodiments of the present application provide a communication method, device and system, which can solve the problem that the communication connection rate with the secondary station is slow when the terminal recovers from the third state to the connected state.
  • a communication method After receiving a first message sent by a terminal requesting a terminal to switch from a third state to a connected state, a first master station determines a secondary station that provides services to the terminal, and obtains A first security parameter and configuration information of an SCG, the first security parameter is used for derivation of a security key used by the terminal to communicate with the secondary station serving the terminal, and the configuration information of the SCG includes the secondary serving the terminal At least one of the random access resources allocated by the station to the terminal, the information of the serving cell set in the secondary station serving the terminal, and the indication information of the primary cell of the secondary station serving the terminal; and then, the first primary The station sends a second message including the first security parameter and the configuration information of the SCG to the terminal.
  • the first master station Since the first security parameter and the configuration information of the SCG are necessary factors for the terminal to communicate with the secondary station serving the terminal, the first master station sends the first security parameter and the configuration information of the SCG to the terminal at the same time, and the terminal can directly According to the first security parameter and the configuration information of the SCG, the communication connection with the auxiliary station serving the terminal is completed, which effectively improves the rate of configuring the SCG when the terminal recovers from the third state to the connected state, further improving The terminal uses the air interface of the secondary station for data transmission efficiency.
  • the method of “the first master station determines a secondary station that provides services to the terminal” is: the first master station receives the terminal for the first master station and sends the first master station.
  • the first information of the auxiliary station serving the terminal is determined, so that the first master station determines the above-mentioned auxiliary station serving the terminal according to the first information.
  • the first information includes the channel quality of each of the at least one measurement cell; or the first information is used to indicate that the secondary station serving the terminal is the first secondary station; or the first information is used to indicate that the terminal is a terminal
  • the secondary station providing services is the first secondary station, and the cells in the first secondary station that meet the preset conditions; or the first information is used to indicate that the secondary station serving the terminal is the second secondary station; or, the first information An identifier used to indicate that the secondary station serving the terminal is not the first secondary station, and an identifier of the second secondary station; or the first information is used to indicate that the secondary station serving the terminal is not the first secondary station, and at least one measurement cell Channel quality in each measurement cell.
  • the first secondary station in this application is a secondary station that provides services to the terminal before the terminal switches to the third state.
  • the first information is carried in a first message, and the first message is specifically used to request to recover a radio link control RRC connection of a terminal or to request an update The location area of the terminal.
  • the second message is used to restore the RRC connection between the first master station and the terminal.
  • the first information in this application may be entirely carried in the first message, or part of the first information may be carried in the first message, and the other part may be carried in the message 7 (the message 7 is the direction after the terminal receives the second message). All of the messages sent by the first master station may also be carried in message 7, which is not specifically limited in this application.
  • the description of the message 7 can be referred to the following.
  • the secondary station serving the terminal is the first secondary station, and the first secondary station provides the terminal with the terminal before the terminal switches to the third state.
  • the above-mentioned "first master station obtains SCG configuration information" method is: the first master station obtains the context of the terminal, and the context of the terminal includes the first terminal identifier, and the first terminal identifier is the first The interface between the first secondary station and the second primary station is the identifier assigned by the terminal.
  • the second primary station is the primary station that provides services to the terminal before the terminal switches to the third state.
  • a secondary station sends a third message including a first terminal identifier, the third message is used to request the first secondary station to allocate the configuration of the SCG; the first primary station receives the configuration information of the SCG from the first secondary station.
  • the first secondary station is a secondary station that provides services to the terminal before the terminal switches to the third state
  • the first secondary station can determine the terminal according to the first terminal identity, and assign an SCG configuration to the terminal.
  • the above-mentioned method of "the first master station obtains the configuration information of the SCG" is :
  • the first master station obtains the context of the terminal, and the context of the terminal includes first configuration information, where the first configuration information is a configuration of the secondary cell group SCG allocated by the first secondary station, and the first secondary station is switched to the third state at the terminal.
  • the secondary station serving the terminal the first primary station sends a third message including the first configuration information to the second secondary station, and the third message is used to request the second secondary station to allocate the configuration of the SCG; the first primary station receives Configuration information of the SCG from the second secondary station.
  • the first master station needs to send the first configuration information to the second secondary station, so that the second secondary station allocates SCG to the terminal with reference to the first configuration information Configuration.
  • the communication method provided in this application further includes: the first master station sends first instruction information to the second master station, and the first instruction information is used to indicate that the terminal is a terminal.
  • the secondary station providing the service is the first secondary station, or the first instruction information is used to indicate that the secondary station serving the terminal is not the first secondary station;
  • the second primary station is to provide the terminal with the terminal before the terminal switches to the third state.
  • the primary station of the service; the first secondary station is the secondary station that provides services to the terminal before the terminal switches to the third state.
  • the first master station sends the first instruction information to the second master station, so that the second master station completes communication with the first secondary station according to the first instruction information.
  • the second master station may determine whether to send the first terminal identifier to the first master station according to the first instruction information.
  • a communication device in a second aspect, can implement the functions in the first aspect and any one of the possible implementation manners. These functions can be implemented by hardware, or they can be implemented by hardware to execute corresponding software.
  • the hardware or software includes one or more modules corresponding to the above functions.
  • the communication device may include a receiving unit, a processing unit, and a sending unit, and the receiving unit, the processing unit, and the sending unit may perform the foregoing first aspect and any possible implementation manners thereof.
  • a receiving unit for receiving a first message from a terminal, the first message for requesting the terminal to switch from a third state to a connected state
  • a processing unit for determining as a terminal A secondary station providing a service, and acquiring a first security parameter, the first security parameter is used for deriving a security key used by the terminal to communicate with the secondary station serving the terminal, and acquiring configuration information of the SCG and the configuration of the SCG
  • the information includes at least one of a random access resource allocated by the secondary station serving the terminal, a set of serving cells in the secondary station serving the terminal, and indication information of the primary cell of the secondary station serving the terminal;
  • a sending unit configured to send a second message to the terminal, where the second message includes the first security
  • a communication device includes a processor, the processor is configured to be coupled to a memory, and read and execute instructions in the memory to implement the first aspect and any one of the possible The communication method described in the implementation.
  • the communication device may further include a memory, and the memory is configured to store program instructions and data of the communication device. Further optionally, the communication device may further include a transceiver, which is configured to execute, under the control of the processor of the communication device, the communication method described in the first aspect and any one of the possible implementation manners. Steps of sending and receiving data, signaling, or information, for example, receiving a first message and sending a second message.
  • the communication device may be a first master station, or a part of the devices in the first master station, such as a chip system in the first master station.
  • the chip system is used to support the first master station to implement the functions involved in the first aspect and any one of the possible implementation manners, for example, receiving, sending, or processing data and / or information involved in the foregoing communication method.
  • the chip system includes a chip, and may also include other discrete devices or circuit structures.
  • a computer-readable storage medium stores instructions; when the computer-readable storage medium runs on the communication device, the communication device is caused to execute the first aspect and various possible implementations as described above.
  • the communication method described in the aspect is also provided, where the computer-readable storage medium stores instructions; when the computer-readable storage medium runs on the communication device, the communication device is caused to execute the first aspect and various possible implementations as described above. The communication method described in the aspect.
  • a computer program product including instructions, which when executed on a communication device, causes the communication device to execute the communication method according to the first aspect and various possible implementations thereof.
  • first computer storage medium may be packaged with the processor or may be packaged separately with the processor, which is not specifically described in this application. limited.
  • a communication method is provided. After the second master station determines that the radio resource control RRC state of the terminal is switched from the connected state to the third state, the second master station sends suspension instruction information to the first secondary station. The suspension of data transmission between the first secondary station and the terminal; correspondingly, the second primary station receives the first configuration information from the first secondary station and stores the first configuration information, where the first configuration information includes the first At least one of the random access resources allocated by the secondary station to the terminal, the configuration information used to indicate the secondary cell group SCG bearer, and the PDCP state of the SCG bearer (or called the SN bearer); subsequently, the second master station receives The context request message of the master station is used for requesting to obtain the context of the terminal.
  • the first master station is an access network device to which the first cell belongs, the first cell is the terminal, and the RRC state is the third state, and the terminal requests Restore the cell where the RRC connection is located; in response to the context request message, the second master station sends the context of the terminal to the first master station, and the context of the terminal includes the first configuration information and a first terminal for indicating the terminal. Identifying at least one of the first terminal identifier standing interface between the first station and the second secondary master station identifier assigned to the terminal for the first secondary.
  • the communication method provided in the present application further includes: the second primary station determines that the secondary station provides services to the terminal; the secondary station that provides services to the terminal is not the first secondary station In the case of a secondary station, the second primary station sends deletion release instruction information to the first secondary station, and the deletion release instruction information is used to delete the first configuration information in the first secondary station, and between the first secondary station and the second primary station The release of the dedicated resources of the terminal on the interface; if the secondary station serving the terminal is the first secondary station, the second master station sends the reserved release instruction information to the first secondary station, and the reserved release instruction information is used for the first The retention of the first configuration information in a secondary station and the release of the dedicated resources of the terminal on the interface between the first secondary station and the second primary station.
  • the primary station that the terminal recovers from the third state to the connected state is the first primary station. Therefore, the dedicated resources of the terminal between the second primary station and the first secondary station need to be released to reduce the waste of resources and improve the resources. Effective utilization.
  • the second primary station determines whether the first secondary station needs to keep the first configuration information according to whether the secondary station serving the terminal is the first secondary station.
  • the method of “the second master station determines a secondary station serving the terminal” is: the second master station receives the first instruction from the first master station Information, and according to the first instruction information, determine the secondary station serving the terminal, where the first instruction information is used to indicate that the secondary station serving the terminal is the first secondary station, or the first instruction information is used to indicate that The secondary station provided by the terminal is not the first secondary station.
  • the first master station in this application determines a secondary station that provides services to the terminal.
  • the first master station can send the first instruction information to the second master station in order to facilitate The second primary station determines subsequent communication with the first secondary station.
  • a communication device can implement the functions in the sixth aspect and any one of the possible implementation manners. These functions can be implemented by hardware, or they can be implemented by hardware to execute corresponding software.
  • the hardware or software includes one or more modules corresponding to the above functions.
  • the communication device may include a processing unit, a receiving unit, and a sending unit, and the processing unit, the receiving unit, and the sending unit may perform the foregoing sixth aspect and any one of its possible implementation manners.
  • a processing unit for determining a radio resource control RRC state of a terminal to switch from a connected state to a third state
  • a receiving unit for receiving first configuration information from a first secondary station, And stores first configuration information, where the first configuration information includes random access resources allocated by the first secondary station to the terminal, configuration information used to indicate the secondary cell group SCG bearer, and PDCP status of the SCG bearer (or SN bearer)
  • a context request message for receiving a context of a terminal from a first master station, the first master station is an access network device to which the first cell belongs, and the first cell is a terminal
  • the RRC state is the third state, and the terminal requests to resume the cell where the RRC connection is located; the sending unit
  • a communication device includes a processor, the processor is configured to be coupled to a memory, and read and execute instructions in the memory to implement the sixth aspect and any one of the possible The communication method described in the implementation.
  • the communication device may further include a memory, and the memory is configured to store program instructions and data of the communication device.
  • the communication device may further include a transceiver, and the transceiver is configured to perform, under the control of the processor of the communication device, the communication according to the sixth aspect and any possible implementation manner thereof.
  • the steps of receiving and sending data, signaling, or information in the method include, for example, sending suspension indication information, receiving first configuration information, and receiving a context request message.
  • the communication device may be a second master station, or a part of the devices in the second master station, such as a chip system in the second master station.
  • the chip system is used to support the second master station to implement the functions involved in the sixth aspect and any one of the possible implementation manners, for example, receiving, sending, or processing data and / or information involved in the foregoing communication method.
  • the chip system includes a chip, and may also include other discrete devices or circuit structures.
  • a computer-readable storage medium stores instructions; when the computer-readable storage medium is run on the communication device, the communication device is caused to execute the sixth aspect and various possible implementations as described above.
  • the communication method described in the aspect is also provided, where the computer-readable storage medium stores instructions; when the computer-readable storage medium is run on the communication device, the communication device is caused to execute the sixth aspect and various possible implementations as described above.
  • the communication method described in the aspect is also provided, where the computer-readable storage medium stores instructions; when the computer-readable storage medium is run on the communication device, the communication device is caused to execute the sixth aspect and various possible implementations as described above.
  • a computer program product including instructions, which when executed on a communication device, causes the communication device to execute the communication method according to the sixth aspect and various possible implementations thereof.
  • first computer storage medium may be packaged with the processor or may be packaged separately with the processor, which is not specifically described in this application. limited.
  • a communication method in which a first secondary station receives suspension instruction information from a second primary station, and the suspension instruction information is used for suspension of data transmission between the first secondary station and the terminal;
  • a secondary station suspends data transmission between the first secondary station and the terminal according to the suspend instruction information, and sends a suspend response message including the first configuration information to the second master station, and the suspend response message is used to indicate the first
  • the data transmission between the secondary station and the terminal has been suspended.
  • the first configuration information includes the random access resources allocated by the first secondary station to the terminal, the configuration information used to indicate the secondary cell group SCG bearer, and the SCG bearer (or SN At least one of the PDCP states.
  • the first secondary station suspends data transmission between the first secondary station and the terminal, and does not disconnect the connection between the first secondary station and the terminal, nor does it disconnect the first
  • the secondary station releases the dedicated resources allocated to the terminal. In this way, when the terminal resumes the connection state from the third state, if the secondary station serving the terminal is still the first secondary station, the terminal can directly use the first secondary station and the terminal.
  • the communication between the terminals improves the efficiency of data transmission by the terminal using the air interface of the secondary station.
  • the communication method provided in this application further includes: the first secondary station receives deletion release instruction information from the second master station, and the deletion release instruction information is used for the first Deletion of the first configuration information in the secondary station and release of the dedicated resources of the terminal on the interface between the first secondary station and the second primary station; or, the first secondary station receives the reserved release indication information from the second primary station The reserved release indication information is used for the retention of the first configuration information in the first secondary station and the release of the dedicated resources of the terminal on the interface between the first secondary station and the second primary station.
  • the communication method provided in the present application further includes: the first secondary station Receiving a first message including a first terminal identifier from a first master station, determining a terminal based on the first terminal identifier, and assigning SCG configuration information to the terminal; further, the first secondary station sends an SCG to the first master station Configuration information.
  • the first message is used to request the resource configuration of the first secondary station.
  • the first primary station is the access network device to which the first cell belongs, the RRC state of the first cell is the terminal, the third state, and the terminal requests to restore the RRC connection.
  • the configuration information of the SCG includes the random access resources allocated by the first secondary station to the terminal. And at least one of information of a serving cell set in the first secondary station and indication information of the primary cell of the first secondary station.
  • a communication device can implement the functions in the eleventh aspect and any one of the possible implementation manners. These functions can be implemented by hardware, or they can be implemented by hardware to execute corresponding software.
  • the hardware or software includes one or more modules corresponding to the above functions.
  • the communication device may include a processing unit, a receiving unit, and a sending unit, and the processing unit, the receiving unit, and the sending unit may execute the above-mentioned eleventh aspect and any possible implementation manner thereof.
  • a receiving unit is configured to receive suspend instruction information from the second master station, and the suspend instruction information is used to suspend data transmission between the first secondary station and the terminal;
  • a processing unit for suspending data transmission between the first secondary station and the terminal according to the suspend instruction information;
  • a sending unit for sending a suspend response message including the first configuration information to the second master station, and the suspend response The message is used to indicate that the data transmission between the first secondary station and the terminal has been suspended.
  • the first configuration information includes the random access resource allocated by the first secondary station to the terminal, the configuration information used to indicate the secondary cell group SCG bearer, and the SCG bearer. (Or SN bearer) at least one of the PDCP states.
  • a communication device includes a processor, the processor is configured to be coupled to a memory, and read and execute instructions in the memory to implement the eleventh aspect and any one of the foregoing.
  • the communication device may further include a memory, and the memory is configured to store program instructions and data of the communication device. Further optionally, the communication device may further include a transceiver, which is configured to execute the communication method according to the eleventh aspect and any one of possible implementation manners under the control of the processor of the communication device. The steps of sending and receiving data, signaling, or information, such as receiving suspend instruction information and sending suspend response messages.
  • the communication device may be a first auxiliary station, or a part of the devices in the first auxiliary station, such as a chip system in the first auxiliary station.
  • the chip system is used to support the first secondary station to implement the functions involved in the eleventh aspect and any one of the possible implementation manners, for example, receiving, sending, or processing data and / or information involved in the foregoing communication method.
  • the chip system includes a chip, and may also include other discrete devices or circuit structures.
  • a computer-readable storage medium is further provided, where the computer-readable storage medium stores instructions; and when the computer-readable storage medium is run on a communication device, the communication device is caused to execute the eleventh aspect and various possibilities described above.
  • a computer program product including instructions, which when executed on a communication device, causes the communication device to execute the communication method according to the eleventh aspect and various possible implementations thereof.
  • first computer storage medium may be packaged with the processor or may be packaged separately with the processor, which is not specifically described in this application. limited.
  • the thirteenth aspect, the fourteenth aspect, the fifteenth aspect, and various implementations thereof in this application reference may be made to the detailed descriptions in the eleventh aspect and various implementations thereof;
  • the beneficial effects of the twelfth aspect, the thirteenth aspect, the fourteenth aspect, the fifteenth aspect, and various implementations thereof refer to the analysis of the beneficial effects in the eleventh aspect and various implementations thereof, here No longer.
  • a communication method in which a terminal sends a first message to a first master station for requesting the terminal to switch from a third state to a connected state, where the first master station is an access network device to which the first cell belongs,
  • the first cell is the cell where the RRC status of the terminal is the third state, and the terminal requests to recover the RRC connection;
  • the terminal receives the first information from the first master station including the first security parameter and the configuration information of the SCG.
  • Two messages In this way, the terminal can complete the communication connection with the secondary station that provides services to the terminal according to the first security parameter and the configuration information of the SCG.
  • the first security parameter here is used for derivation of the security key used by the terminal to communicate with the secondary station serving the terminal.
  • the configuration information of the SCG includes the random access resources allocated to the terminal by the secondary station serving the terminal, and the terminal. At least one of information of a serving cell set in a serving secondary station and indication information of a primary cell of a serving secondary station serving a terminal.
  • the terminal may directly send the configuration information of the first security parameter and the SCG after the terminal receives the configuration information.
  • the first security parameter and the configuration information of the SCG complete the communication connection with the above-mentioned auxiliary station serving the terminal, which effectively improves the rate of configuring the SCG when the terminal recovers from the third state to the connected state, further improving the terminal. Efficiency of data transmission using the air interface of the secondary station.
  • the communication method provided in the present application further includes: the terminal receives the state switching instruction information from the second master station, and responds to the state switching instruction information to change the RRC state of the terminal. Switch to the third state and store the first configuration information corresponding to the first secondary station, wherein the state switching instruction information is used to instruct the RRC state of the terminal to switch from the connected state to the third state, and the first configuration information includes the secondary cell group At least one of the configuration information of the SCG bearer and the PDCP state of the SCG bearer (or called the SN bearer).
  • the terminal in the present application no longer deletes the configuration information related to the first secondary station, but stores the first configuration information. In this way, in the subsequent restoration of the terminal from the third state to the connected state, if the secondary station serving the terminal is still the first secondary station, the terminal can resume the connection with the first secondary station by referring to the first configuration information. , Which effectively improves the terminal's efficiency of data transmission by using the secondary station air interface.
  • the foregoing first message includes first information, and the first information is used by the first primary station to determine a secondary station that provides services to the terminal; wherein the first information Including the channel quality of each measurement cell in at least one measurement cell; or the first information is used to indicate that the secondary station serving the terminal is the first secondary station; or the first information is used to indicate the secondary station serving the terminal Is the first secondary station, and a cell that satisfies a preset condition in the first secondary station; or, the first information is used to indicate that the secondary station serving the terminal is the second secondary station; or the first information is used to indicate that the terminal is a terminal
  • the secondary station providing the service is not the first secondary station and the identifier of the second secondary station; or, the first information is used to indicate that the secondary station serving the terminal is not the first secondary station, and each measurement cell in at least one measurement cell
  • the first secondary station is the secondary station that provides services to the terminal before the terminal switches to the third state.
  • a seventeenth aspect provides a communication device capable of implementing the functions in the sixteenth aspect and any one of the possible implementation manners. These functions can be implemented by hardware, or they can be implemented by hardware to execute corresponding software.
  • the hardware or software includes one or more modules corresponding to the above functions.
  • the communication device may include a processing unit, a receiving unit, and a sending unit, and the processing unit, the receiving unit, and the sending unit may execute the sixteenth aspect described above and any possible implementation manner thereof.
  • a sending unit is configured to send a first message to the first master station, the first message is used to request the terminal to switch from the third state to the connected state, and the first master station is the first The access network equipment to which the cell belongs.
  • the first cell is the cell where the RRC status of the terminal is the third state and the terminal requests to recover the RRC connection.
  • the processing unit is configured to use the configuration information according to the first security parameter and the SCG.
  • the receiving unit is configured to receive a second message from the first master station, the second message includes the first security parameter and the configuration information of the SCG; the first security parameter is used for Derivation of the security key used by the terminal to communicate with the secondary station serving the terminal.
  • the configuration information of the SCG includes the secondary station serving the terminal and assigning it to the terminal. Secondary station random access indication information resources, providing services for the terminal in the serving cell information and the main set of the secondary cell for the terminal station to provide at least one service.
  • a communication device includes a processor, the processor is configured to be coupled to a memory, and read and execute instructions in the memory to implement the sixteenth aspect and any one of the foregoing.
  • the communication device may further include a memory, and the memory is configured to store program instructions and data of the communication device.
  • the communication device further includes a transceiver for performing data transmission and reception in the communication method according to the sixteenth aspect and any one of the possible implementation manners under the control of the processor of the communication device. , Signaling or information steps, for example, sending a first message and receiving a second message.
  • the communication device may be a terminal, or a part of the devices in the terminal, such as a chip system in the terminal.
  • the chip system is used to support the terminal to implement the functions involved in the sixteenth aspect and any one of the possible implementation manners, for example, receiving, sending, or processing data and / or information involved in the foregoing communication method.
  • the chip system includes a chip, and may also include other discrete devices or circuit structures.
  • a computer-readable storage medium stores instructions; when the computer-readable storage medium is run on a communication device, the communication device is caused to execute the sixteenth aspect and various possibilities described above.
  • a computer program product including instructions, which when executed on a communication device, causes the communication device to execute the communication method according to the sixteenth aspect and various possible implementations thereof.
  • first computer storage medium may be packaged with the processor or may be packaged separately with the processor, which is not specifically described in this application. limited.
  • a communication system including the communication device according to any one of the second to fifth aspects, and the communication device according to any one of the seventh to tenth aspects. And the communication device according to any one of the twelfth aspect to the fifteenth aspect.
  • the communication system further includes the communication device according to any one of the seventeenth to twentieth aspects of the foregoing claims.
  • the names of the communication devices do not limit the devices or functional modules themselves. In actual implementation, these devices or functional modules may appear under other names. As long as the function of each device or functional module is similar to this application, it is within the scope of the claims of this application and its equivalent technology.
  • FIG. 1 is a network architecture of a conventional LTE system
  • FIG. 2 is a schematic diagram of a network structure in which a 4G system and a 5G system coexist;
  • FIG. 3 is a schematic structural diagram of a communication system in an ENDC scenario
  • FIG. 4 is a schematic structural diagram of a communication system in a NEDC scenario
  • FIG. 5 is a schematic diagram of a communication system structure in an NG-ENDC scenario
  • FIG. 6 is a schematic diagram of a hardware structure of a base station according to an embodiment of the present application.
  • FIG. 7 is a schematic diagram of a hardware structure of a mobile phone according to an embodiment of the present application.
  • FIG. 8 is a first schematic flowchart of a communication method according to an embodiment of the present application.
  • FIG. 9 is a second schematic flowchart of a communication method according to an embodiment of the present application.
  • FIG. 10 is a third flowchart of a communication method according to an embodiment of the present application.
  • FIG. 11 is a fourth flowchart of a communication method according to an embodiment of the present application.
  • FIG. 12 is a first schematic flowchart of a communication device according to an embodiment of the present application.
  • FIG. 13 is a second schematic flowchart of a communication device according to an embodiment of the present application.
  • words such as “exemplary” or “for example” are used as examples, illustrations or illustrations. Any embodiment or design described as “exemplary” or “for example” in the embodiments of the present application should not be construed as more preferred or more advantageous than other embodiments or designs. Rather, the use of the words “exemplary” or “for example” is intended to present the relevant concept in a concrete manner.
  • first and second are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as “first” and “second” may explicitly or implicitly include one or more of the features. In the description of the embodiments of the present application, unless otherwise stated, “multiple” means two or more.
  • an evolved base station (eNB) in a long term evolution (LTE) system is referred to as an LTE eNB
  • a UE in the LTE system is referred to as an LTE UE
  • a UE in the 5G system is referred to as For 5G UE.
  • an LTE eNB accesses a packet core (EPC) network through an S1 interface, and different LTE eNBs are connected through an X2 interface.
  • EPC packet core
  • Each LTE eNB is connected to at least one LTE UE.
  • FIG. 1 illustrates a network architecture of a conventional LTE system.
  • the connection between the LTE eNB and the LTE UE is a wireless connection.
  • a solid line is used in Figure 1.
  • the LTE eNB can evolve into a next-generation LTE base station (Next-Generation eNB, ng-eNB).
  • the ng-eNB provides the UE with wireless transmission resources through the evolved Universal Terrestrial Radio Access (E-UTRA) technology.
  • the ng-eNB can provide the 5th Generation Core Network (5GCN) service for the UE, and it can also provide the EPC service for the UE.
  • 5GCN 5th Generation Core Network
  • ng-eNB can be connected to 5GCN / EPC only, or it can be connected to 5GCN and EPC at the same time.
  • 5GCN can also be called 5GC.
  • the access network (Radio Access Network, RAN) of the 5G system is called Next Generation RAN (NG-RAN), and the NG-RAN node includes ng-eNB and gNB (base stations in the 5G system).
  • NG-RAN Next Generation RAN
  • gNB provides wireless transmission resources for 5G UEs through New Air Interface (NR) technology, and provides 5GC services for 5G UEs.
  • NR New Air Interface
  • FIG. 2 shows a network structure in which a 4G system and a 5G system coexist.
  • the ng-eNB can access the EPC through the S1 interface, and can also access the 5GC through other corresponding interfaces (indicated by NG in FIG. 2).
  • the 5G UE connected to the ng-eNB can access the 5GC through the ng-eNB.
  • LTE UE connected to ng-eNB can access EPC through ng-eNB.
  • the LTE eNB and the ng-eNB connected to the EPC are connected through an X2 interface, and the ng-eNB and the gNB are connected through an Xn interface.
  • the connection between the multiple devices and the UE may be a wireless connection. In order to conveniently and intuitively represent the connection relationship between the various devices, a solid line is used in FIG. 2.
  • the LTE UE may be in an RRC idle mode or an RRC connected mode.
  • the LTE UE deletes the access stratum (AS) context
  • the core network device retains the context of the LTE UE
  • the RAN device does not have the context of the LTE UE.
  • the core network device and the RAN There is also no LTE-specific signaling connection (UE connection) between the devices.
  • UE connection LTE-specific signaling connection
  • the core network device initiates paging of the LTE UE in a tracking area (TA) of the LTE UE, where the tracking area may also be called a paging area.
  • TA tracking area
  • the LTE UE learns whether it needs to switch to the RRC connection state for downlink data reception by monitoring the paging channel. When the LTE UE needs to send uplink data, the LTE UE will also actively switch to the RRC connection state to complete the sending of the uplink data. When the LTE UE in the RRC idle state crosses the TA, it needs to perform location area update (Tracking Area Update, TAU). In the scenario where the LTE UE is in the RRC connection state, both the core network device and the RAN device have the context of the LTE UE. The RRC connection is maintained between the LTE UE and the RAN device, and the LTE UE can perform data uplink and downlink transmission.
  • TAU Track Area Update
  • 5G UE can also be in RRC idle state and RRC connected state.
  • the 5G UE may also be in a third state, where the third state may also be called an inactive state (RRC INACTIVE mode or RRC_INACTIVE state).
  • RRC INACTIVE mode RRC INACTIVE state
  • both the 5G UE and the RAN device store the AS context of the 5G UE
  • the core network device stores the context of the 5G UE
  • the core network device and the RAN device have the 5G UE-specific Signaling connection (UE association, NG connection)
  • the RRC connection between the 5G UE and the RAN device is suspended.
  • the RAN device can initiate paging.
  • the paging area can be an idle TA, RAN-based notification area (RNA), or a cell list.
  • location update is required, such as TAU or RNAU (RAN-based Notification Area Update, RNAU).
  • TAU RAN-based Notification Area Update
  • RNAU RAN-based Notification Area Update
  • the 5G UE in the third state is similar to the 5G UE in the connected state.
  • the 5G UE in the third state is similar to the 5G UE in the idle state.
  • the UE needs to send a request to the RAN device to restore the RRC connection, and then send uplink data.
  • the RAN device stores the AS context of the 5G UE, which can speed up the 5G UE's return to the connected state and perform fast data transmission.
  • a 5G system there are multiple wireless access technologies such as Multiple Connects (Dual Connectivity, MR-DC) heterogeneous communication systems.
  • This heterogeneous communication system includes ENDC (E-UTRA NR DC), NEDC (NR E-UTRA DC), and NG-ENDC (Next Generation E-UTRA NR DC).
  • LTE eNB / eLTE eNB LTE base station
  • gNB NR base station
  • eLTE eNB refers to an LTE eNB that can be connected to NGC.
  • NGC is also called the 5th Generation Core (5GC)
  • eLTE eNB is also called ng-eNB.
  • the ENDC is also called Option 3 / 3A / 3X.
  • the LTE eNB is the master station (Master Node, MN)
  • the gNB is the secondary station (Secondary Node, SN)
  • the MN is connected to the EPC
  • the MN and SN provide air interface transmission resources for the data between the terminal and the EPC.
  • FIG. 3 (a) in FIG. 3 is a schematic diagram of an Option 3 communication system, and (b) in FIG. 3 is a schematic diagram of an Option 3A communication system.
  • the LTE eNB is connected to the EPC through the S1 interface (including the S1-C interface and the S1-U interface), and the LTE eNB and the gNB are connected through the X2 interface.
  • gNB is also connected to EPC through S1-U interface.
  • the connection of the control surfaces is indicated by a dotted line in FIG. 3.
  • the NEDC is also called Option 4 / 4A.
  • the gNB is the MN
  • the eLTE eNB is the SN
  • the MN is connected to the NGC.
  • the MN and the SN provide air interface transmission resources for the data between the terminal and the NGC.
  • FIG. 4 (a) in FIG. 4 is a schematic diagram of an Option 4 communication system, and (b) in FIG. 4 is a schematic diagram of an Option 4A communication system.
  • the gNB is connected to the NGC through the NG interface (including the NG-C interface and the NG-U interface), and the eLTE eNB and the gNB are connected through the Xn interface.
  • the eLTE eNB is also connected to the NGC through the NG-U interface.
  • the connection of the control surfaces is indicated by a dotted line in FIG. 4.
  • NG-ENDC is also called Option 7 / 7A / 7X.
  • eLTE eNB is MN
  • gNB is SN
  • MN is connected to NGC.
  • MN and SN provide air interface transmission resources for data between the terminal and NGC.
  • FIG. 5 (a) in FIG. 5 is a schematic structural diagram of an Option 7 communication system, and (b) in FIG. 5 is a schematic structural diagram of an Option 7A communication system.
  • the eLTE eNB is connected to the NGC through the NG interface (including the NG-C interface and the NG-U interface), and the eLTE eNB and the gNB are connected through the Xn interface.
  • gNB is also connected to NGC through NG-U interface.
  • the connection of the control surfaces is indicated by a dotted line in FIG. 5.
  • the base stations in the above NE-DC communication system and NGEN-DC communication system belong to the NG-RAN node and are connected to the 5GC. Therefore, the terminals in the NE-DC communication system and the NGEN-DC communication system can Support for the third state.
  • the terminal when the terminal enters the third state from the connected state, the terminal deletes the relevant configuration of the secondary station stored by itself, that is, deletes the configuration of the SCG.
  • the master station Release the secondary station.
  • the master station currently serving the terminal needs to reconfigure the secondary station for the terminal, but the process in which the master station currently serving the terminal reconfigures the secondary station for the terminal
  • the speed is slow, which is not conducive for the terminal to quickly use the air interface of the secondary station for data transmission.
  • an embodiment of the present application provides a communication method. After receiving the first message sent by the terminal to request the terminal to recover from the third state to the connected state, the first master station determines to provide services to the terminal. And acquires the first security parameter and the configuration information of the SCG, and then the first master station sends a second message including the first security parameter and the configuration information of the SCG to the terminal.
  • the first security parameter is used to derive a security key used by the terminal to communicate with the secondary station serving the terminal
  • the configuration information of the SCG includes a random access resource allocated to the terminal by the secondary station serving the terminal. And at least one of information of a serving cell set in the secondary station serving the terminal and indication information of the primary cell of the secondary station serving the terminal.
  • the first master station sends the first security parameter and the configuration information of the SCG to the terminal at the same time, and the terminal may Complete the communication connection with the auxiliary station serving the terminal directly according to the first security parameter and the configuration information of the SCG, which effectively improves the rate of configuring the SCG when the terminal recovers from the third state to the connected state, The efficiency of data transmission by the terminal using the air interface of the auxiliary station is further improved.
  • the communication method provided in the embodiment of the present application is applicable to the heterogeneous communication system shown in FIG. 4 or FIG. 5 above, and also applicable to a 5G system supporting multiple connections of the same standard, such as a DC between gNB and gNB, or eLTE eNB and eLTE DC between eNBs is used to provide data transmission between the UE and the 5GC.
  • a DC between gNB and gNB or eLTE eNB and eLTE DC between eNBs is used to provide data transmission between the UE and the 5GC.
  • the master station involved in this embodiment of the present application may be the above gNB or the above eLTE eNB, which is not specifically limited in this embodiment of the present application.
  • the secondary stations involved in the embodiments of the present application may be the above-mentioned gNB or the above-mentioned eLTE eNB, which is not specifically limited in this embodiment of the present application.
  • the primary station serving the terminal is gNB
  • the secondary station serving the terminal is eLTE eNB.
  • the master station may be a master station that provides services to the terminal before the terminal transits from the connected state to the third state, or a master station that provides services to the terminal after the terminal recovers from the third state to the connected state.
  • the secondary station here can be a secondary station that provides services to the terminal before the terminal switches from the connected state to the third state, or a secondary station that provides services to the terminal after the terminal recovers from the third state to the connected state.
  • the embodiment of the present application mainly uses the heterogeneous communication system shown in FIG. 4 or FIG. 5 as an example for description.
  • the foregoing eLTE eNB and gNB are both base stations
  • FIG. 6 shows a composition structure of the base station (eLTE eNB / gNB) in the embodiment of the present application.
  • the base station may include a processor 61, a memory 62, and a bus 63.
  • the processor 61 is a control center of the base station, and may be a processor or a collective name of a plurality of processing elements.
  • the processor 61 is a CPU, may also be a specific integrated circuit (Application Specific Integrated Circuit, ASIC), or one or more integrated circuits configured to implement the embodiments of the present application, such as one or more micro-processors. (Digital Signal Processor, DSP), or one or more Field Programmable Gate Array (FPGA).
  • ASIC Application Specific Integrated Circuit
  • DSP Digital Signal Processor
  • FPGA Field Programmable Gate Array
  • the processor 61 may perform various functions of the base station by running or executing a software program stored in the memory 62 and calling data stored in the memory 62.
  • the processor 61 may include one or more CPUs, such as CPU0 and CPU1 shown in the figure.
  • the processor 61 may be a single-core processor (single-CPU) or a multi-core processor (multi-CPU).
  • a processor herein may refer to one or more devices, circuits, and / or processing cores for processing data (such as computer program instructions).
  • the memory 62 may be a read-only memory (ROM) or other type of static storage device that can store static information and instructions, a random access memory (Random Access Memory, RAM), or other types that can store information and instructions
  • the dynamic storage device can also be Electrically Erasable Programmable Read-Only Memory (EEPROM), Compact Disc (Read-Only Memory, CD-ROM) or other optical disk storage, optical disk storage (Including compact discs, laser discs, optical discs, digital versatile discs, Blu-ray discs, etc.), disk storage media or other magnetic storage devices, or can be used to carry or store desired program code in the form of instructions or data structures and can be used by a computer Any other media accessed, but not limited to this.
  • the memory 62 may exist independently, and is connected to the processor 61 through a bus 63.
  • the memory 62 may also be integrated with the processor 61.
  • the memory 62 is configured to store a software program that executes the solution of the present application, and is controlled and executed by the processor 61.
  • the bus 63 may be an Industry Standard Architecture (ISA) bus, a Peripheral Component Interconnect (PCI) bus, or an Extended Industry Standard Architecture (EISA) bus.
  • ISA Industry Standard Architecture
  • PCI Peripheral Component Interconnect
  • EISA Extended Industry Standard Architecture
  • the bus can be divided into an address bus, a data bus, a control bus, and the like. For ease of representation, only a thick line is used in FIG. 6, but it does not mean that there is only one bus or one type of bus.
  • the base station further includes a transceiver 64.
  • the transceiver 64 is configured to communicate with other devices or communication networks under the control of the processor 61. For example, it is used to communicate with communication networks such as Ethernet, radio access network (RAN), wireless local area networks (WLAN) and the like.
  • the transceiver 64 may include all or part of a baseband processor, and may optionally include a radio frequency (RF) processor.
  • the RF processor is used to transmit and receive RF signals
  • the baseband processor is used to implement processing of the baseband signal converted from the RF signal or the baseband signal to be converted into the RF signal.
  • transceiver 64 Since the transceiver 64 is optional, it is indicated by a dotted line in FIG. 6.
  • the device structure shown in FIG. 6 does not constitute a limitation on the base station, and may include more or fewer components than those shown in the figure, or some components may be combined, or different components may be arranged.
  • the terminal in the embodiment of the present application may refer to a mobile phone (such as a mobile phone 700 shown in FIG. 7), a tablet computer, a personal computer (PC), and a mobile terminal capable of transmitting data with the eLTE eNB / gNB on the control plane and the user plane.
  • a mobile phone such as a mobile phone 700 shown in FIG. 7
  • a tablet computer such as a tablet computer
  • PC personal computer
  • the mobile phone 700 may specifically include a processor 701, an RF circuit 702, a memory 703, a peripheral interface 704, and a power supply device 705.
  • the mobile phone 700 may further include components such as a touch screen 706, a Bluetooth device 707, one or more sensors 708, a wireless fidelity (Wi-Fi) device 709, a positioning device 710, and an audio circuit 711. These components can communicate via one or more communication buses or signal lines (not shown in FIG. 7).
  • touch screen 706, Bluetooth device 707, one or more sensors 708, Wireless Fidelity (Wi-Fi) device 709, positioning device 710, and audio circuit 711 are optional components, they are indicated by dashed boxes in FIG. 7 .
  • Each component of the mobile phone 700 is specifically described below with reference to FIG. 7:
  • the processor 701 is the control center of the mobile phone 700, and uses various interfaces and lines to connect various parts of the mobile phone 700.
  • the processor 701 executes or executes the application programs stored in the memory 703 and calls the data stored in the memory 703 to execute Various functions and processing data.
  • the processor 701 may include one or more processing units.
  • the processor 701 may further include a fingerprint verification chip, which is used to verify the collected fingerprint.
  • the radio frequency circuit 702 may be used for receiving and transmitting wireless signals during information transmission and reception or during a call.
  • the radio frequency circuit 702 may receive the downlink data of the base station and process it to the processor 701; in addition, the uplink data is sent to the base station.
  • the radio frequency circuit includes, but is not limited to, an antenna, at least one amplifier, a transceiver, a coupler, a low noise amplifier, a duplexer, and the like.
  • the radio frequency circuit 702 can also communicate with other devices through wireless communication.
  • the wireless communication may use any communication standard or protocol, including but not limited to a global mobile communication system, a general packet wireless service, code division multiple access, broadband code division multiple access, long-term evolution, email, short message service, and the like.
  • the memory 703 is configured to store application programs and data, and the processor 701 executes various functions and data processing of the mobile phone 700 by running the application programs and data stored in the memory 703.
  • the memory 703 mainly includes a storage program area and a storage data area, where the storage program area can store an operating system and at least one application required by a function (such as a sound playback function, an image processing function, etc.); the storage data area can store data according to the use of the mobile phone. Data created at 700 (such as audio data, phone book, etc.).
  • the memory 703 may include a high-speed random access memory (RAM), and may also include a non-volatile memory, such as a magnetic disk storage device, a flash memory device, or other volatile solid-state storage devices.
  • the memory 703 may store various operating systems, for example, an iOS operating system, an Android operating system, and the like.
  • the memory 703 may be independent and connected to the processor 701 through the communication bus; the memory 703 may also be integrated with the processor 701.
  • the peripheral interface 704 is used to provide various interfaces for external input / output devices (such as a keyboard, a mouse, an external display, an external memory, a user identification module card, etc.).
  • external input / output devices such as a keyboard, a mouse, an external display, an external memory, a user identification module card, etc.
  • a universal serial bus (Universal Serial Bus, USB) interface is used to connect with a mouse
  • a metal contact on the card slot of the user identification module is used to connect with a subscriber identification module (SIM) card provided by a telecommunications operator.
  • SIM subscriber identification module
  • the peripheral interface 704 may be used to couple external input / output peripherals to the processor 701 and the memory 703.
  • the power supply device 705 is used to supply power to various components in the mobile phone 700.
  • the power supply device 705 can be a battery and a power management chip.
  • the battery can be logically connected to the processor 701 through the power management chip, so that the power supply device 705 can realize functions such as managing charging, discharging, and power consumption management.
  • the touch screen 706 may specifically include a touch pad 706-1 and a display 706-2.
  • the touchpad 706-1 can collect touch events on or near the user of the mobile phone 700 (for example, the user uses a finger, a stylus or any suitable object on the touchpad 706-1 or the touchpad 706 Near -1), and send the collected touch information to other devices (such as the processor 701).
  • the user's touch event near the touchpad 706-1 can be called hovering touch; hovering touch can mean that the user does not need to directly touch the touchpad in order to select, move or drag an object (such as an icon). , As long as the user is near the device in order to perform the desired function.
  • various types such as resistive, capacitive, infrared, and surface acoustic wave can be used to implement the touch panel 706-1.
  • the display 706-2 may be used to display information input by the user or information provided to the user and various menus of the mobile phone 700.
  • the display 706-2 may be configured in the form of a liquid crystal display, an organic light emitting diode, or the like.
  • the touchpad 706-1 may be overlaid on the display 706-2. When the touchpad 706-1 detects a touch event on or near it, it is transmitted to the processor 701 to determine the type of the touch event, and then the processor The 701 may provide a corresponding visual output on the display 706-2 according to the type of the touch event.
  • the touchpad 706-1 and the display 706-2 are implemented as two separate components to implement the input and output functions of the mobile phone 700, in some embodiments, the touchpad 706-1 Integrated with the display 706-2 to implement the input and output functions of the mobile phone 700.
  • the touch screen 706 is made of multiple layers of materials. Only the touch panel (layer) and display (layer) are shown in the embodiments of the present application. The other layers are in the embodiments of the present application. Not recorded.
  • the touchpad 706-1 can be configured on the front of the mobile phone 700 in the form of a full board, and the display 706-2 can also be configured on the front of the mobile phone 700 in the form of a full board. In this way, a borderless structure.
  • the mobile phone 700 may also have a fingerprint recognition function.
  • the fingerprint collection device 712 may be configured on the back of the mobile phone 700 (eg, under the rear camera), or the fingerprint collection device 712 may be configured on the front of the mobile phone 700 (eg, under the touch screen 706).
  • a fingerprint collection device 712 may be configured in the touch screen 706 to implement the fingerprint identification function, that is, the fingerprint collection device 712 may be integrated with the touch screen 706 to implement the fingerprint identification function of the mobile phone 700.
  • the fingerprint collection device 712 is configured in the touch screen 706, may be a part of the touch screen 706, or may be configured in the touch screen 706 in other ways.
  • the main component of the fingerprint collection device 712 in this embodiment of the present application is a fingerprint sensor, and the fingerprint sensor may use any type of sensing technology, including but not limited to optical, capacitive, piezoelectric, or ultrasonic sensing technologies. .
  • the Bluetooth device 707 is used to implement data exchange between the mobile phone 700 and other short-range devices (for example, mobile phones, smart watches, etc.).
  • the Bluetooth device in the embodiments of the present application may be an integrated circuit or a Bluetooth chip.
  • the mobile phone 700 may further include at least one sensor 708, such as a light sensor, a motion sensor, and other sensors.
  • the light sensor may include an ambient light sensor and a proximity sensor.
  • the ambient light sensor may adjust the brightness of the display of the touch screen 706 according to the brightness of the ambient light.
  • the proximity sensor may turn off the power of the display when the mobile phone 700 is moved to the ear.
  • an accelerometer sensor can detect the magnitude of acceleration in various directions (usually three axes), and can detect the magnitude and direction of gravity when it is stationary.
  • attitude of the mobile phone such as horizontal and vertical screen switching, related Games, magnetometer attitude calibration), vibration recognition related functions (such as pedometer, tap), etc .
  • other sensors such as gyroscopes, barometers, hygrometers, thermometers, infrared sensors, etc. More details.
  • Wi-Fi device 709 is used to provide mobile phone 700 with network access that complies with Wi-Fi related standard protocols. Mobile phone 700 can access Wi-Fi access points through Wi-Fi device 709 to help users send and receive email, Browse the web and access streaming media, etc., it provides users with wireless broadband Internet access. In some other embodiments, the Wi-Fi device 709 can also be used as a Wi-Fi wireless access point, and can provide Wi-Fi network access for other devices.
  • the positioning device 710 is configured to provide a geographic location for the mobile phone 700. It can be understood that the positioning device 710 may specifically be a receiver of a global positioning system (Global Positioning System, GPS) or a positioning system such as Beidou satellite navigation system or Russian GLONASS. After receiving the geographic position sent by the positioning system, the positioning device 710 sends the information to the processor 701 for processing, or sends the information to the memory 703 for storage. In other embodiments, the positioning device 710 may also be a receiver of an assisted global positioning system (AGPS). The AGPS system assists the positioning device 710 to complete ranging and positioning services by using an auxiliary server.
  • AGPS assisted global positioning system
  • the auxiliary positioning server communicates with a device such as a positioning device 710 (ie, a GPS receiver) of the mobile phone 700 through a wireless communication network to provide positioning assistance.
  • a positioning device 710 ie, a GPS receiver
  • the positioning device 710 may also be a positioning technology based on a Wi-Fi access point.
  • each Wi-Fi access point has a globally unique MAC address
  • the device can scan and collect the broadcast signals of surrounding Wi-Fi access points when Wi-Fi is turned on, so it can obtain Wi-Fi The MAC address broadcast by the Fi access point; the device sends these data (such as the MAC address) that can identify the Wi-Fi access point to the location server through the wireless communication network, and the location server retrieves each Wi-Fi access point And the strength of the Wi-Fi broadcast signal, the geographical position of the device is calculated and sent to the positioning device 710 of the device.
  • the audio circuit 711, the speaker 713, and the microphone 714 may provide an audio interface between the user and the mobile phone 700.
  • the audio circuit 711 may transmit the received electrical data converted electrical signal to the speaker 713, which is converted into a sound signal by the speaker 713 for output.
  • the microphone 714 converts the collected sound signal into an electrical signal, and the audio circuit 711 After receiving, it is converted into audio data, and then the audio data is output to the RF circuit 702 for transmission to another mobile phone, or the audio data is output to the memory 703 for further processing.
  • the mobile phone 700 may further include a camera (front camera and / or rear camera), a flash, a micro-projection device, a near field communication (NFC) device, and the like, and details are not described herein.
  • a camera front camera and / or rear camera
  • a flash may further include a flash, a micro-projection device, a near field communication (NFC) device, and the like, and details are not described herein.
  • NFC near field communication
  • the hardware structure shown in FIG. 7 does not constitute a limitation on the mobile phone, and the mobile phone 700 may include more or fewer components than shown in the figure, or combine certain components, or arrange different components.
  • the embodiment of the present application uses the master station 1 to indicate the master station that provides services to the terminal before the terminal switches from the connected state to the third state, that is, the master station 1 represents the second master station; and the master station 2 represents the terminal station.
  • the master station that serves the terminal after recovering from the third state to the connected state, that is, the master station 2 represents the first master station;
  • the use of the auxiliary station 1 represents the auxiliary station that provides services to the terminal before the terminal switches from the connected state to the third state.
  • Station that is, secondary station 1 represents the first secondary station; using secondary station 2 represents the secondary station that serves the terminal after the terminal recovers from the third state to the connected state, that is, secondary station 2 represents the second secondary station.
  • FIG. 8 is a schematic flowchart of a communication method according to an embodiment of the present application.
  • S800 is executed by the processor in the primary station 1
  • S801, S804, and S809 are executed by the processor in the terminal
  • S802 and S803 are processed by the secondary station 1.
  • S805, S806, S807 and S808 are executed by the processor in the master station 2.
  • the communication method includes the following steps.
  • the primary station 1 After determining that the RRC state of the terminal is switched from the connected state to the third state, the primary station 1 sends state switching instruction information to the terminal, and sends the suspension instruction information to the secondary station 1.
  • the master station 1 There is an RRC connection between the master station 1 and the terminal, and the master station 1 is configured with DC operation for the terminal. For example, the master station 1 selects the secondary station 1 as the secondary station of the terminal.
  • the terminal performs data transmission through the air interface resources of the primary station 1 and the air interface resources of the secondary station 1.
  • the communication data between the terminal and the master station 1 for example, data of a Data Radio Bearer (DRB) or signaling of a Signaling Radio Bearer (SRB), is based on the initial MN security key for security protection.
  • the communication data between the terminal and the secondary station 1 is protected based on the initial SN security key.
  • DRB Data Radio Bearer
  • SRB Signaling Radio Bearer
  • Security protection here can refer to encryption and decryption, integrity protection and integrity check. Encryption / decryption needs to be performed based on the encryption key and encryption algorithm. Integrity protection / integrity verification needs to be performed according to the integrity protection key and the integrity protection algorithm.
  • the encryption key is derived based on the basic key and the encryption algorithm
  • the integrity protection key is derived based on the basic key and the integrity protection algorithm.
  • the encryption algorithm and the integrity protection algorithm may be the same or different.
  • both the encryption algorithm and the integrity protection algorithm can be configured by the base station to which the Packet Data Convergence Protocol (Packet Data Convergence Protocol) entity belongs.
  • the primary station 1 configures the encryption algorithm and integrity protection algorithm used by the MN bearer
  • the secondary station 1 configures the encryption algorithm and integrity protection algorithm used by the SN bearer.
  • the base key may be KeNB or KgNB.
  • the UE can establish two types of radio bearers when DC operation is configured.
  • the first type is the Packet Data Convergence Protocol (PDCP) terminated bearer on the MN (MN terminated bearer), referred to as the MN bearer.
  • MN terminated bearer MN terminated bearer
  • This kind of bearer PDCP is deployed on the MN, and the MN's PDCP performs security-related processing
  • the second type is the bearer that PDCP terminates on the SN (SN bearer), referred to as SN bearer.
  • SN bearer This type of bearer PDCP is deployed on the SN, and the PDCP of the SN performs security-related processing.
  • the PDCP protocol data unit (Protocol Data Unit) carried by the MN bearer and the SN bearer can be sent through the MN air interface resource and / or the SN air interface resource.
  • MCG Master Cell Group
  • SCG Secondary Cell Group
  • the keys used for encryption and integrity protection are collectively referred to as a security key, and the encryption algorithm and the integrity protection algorithm are collectively referred to as a security algorithm. That is, the security key includes an encryption key and / or an integrity protection key, and the security algorithm includes an encryption algorithm and / or an integrity protection algorithm.
  • the encryption key includes an encryption key used for RRC signaling and / or an encryption key used for data
  • the integrity protection key includes an integrity protection key used for RRC signaling and / or used for Data integrity protection keys
  • encryption algorithms include encryption algorithms used for RRC signaling and / or encryption algorithms used for data
  • integrity protection algorithms include integrity protection algorithms used for RRC signaling and / or used for data Integrity protection algorithm.
  • the security context of the terminal includes: the initial MN basic key, the initial SN basic key, the initial MN security key (for MN Link security protection key), initial MN security algorithm (algorithm for MN link security protection), initial SN security key (secret key for SN link security protection), initial SN security algorithm (for At least one of SN link security protection algorithm), next hop parameter (NH), next hop chain counter parameter (NCC), and SN security parameter.
  • the SN security parameter is used to obtain the initial SN basic key based on the initial MN basic key.
  • the SN security parameter is Sk counter.
  • the master station 1 After the master station 1 determines to switch the RRC state of the terminal from the connected state to the third state, the master station 1 sends state switching instruction information to the terminal, and the state switching instruction information is used to instruct the terminal's RRC state to switch from the connected state to the third state.
  • state switching instruction information is used to instruct the terminal's RRC state to switch from the connected state to the third state.
  • the state switching instruction information may be carried in message 1.
  • the message 1 may be an RRC Connection Release (RRC Connection Release or RRC Release) message.
  • the state switching indication information may be embodied in a direct (or called explicit) or indirect (or called implicit) manner, which is not specifically limited in this embodiment of the present application.
  • the state switching instruction information may be an RRC Inactive command.
  • the state switching instruction information may be a terminal identifier 1, which is a special identifier for the terminal in a third state in a certain access network area, such as inactive wireless network temporary Identification (Inactive, Radio, Network, Tempory, Identity, I-RNTI) or Resume ID.
  • the access network area may consist of one or more cells, or one or more tracking areas (TA), or one or more RAN areas (RAN-Area). Among them, one tracking area is characterized by one TA identifier (TA Code); one RAN area is characterized by one RAN area identifier (RAN-Area code), and the RAN area identifier is only unique within one TA.
  • the message 1 may further include a second security parameter.
  • the second security parameter is used by the terminal to derive a basic key for next communication with the base station based on the current initial MN basic key.
  • the second security parameter is a next hop chain counting parameter (Next Hop Chain Counter parameter, NCC).
  • NCC Next Hop Chain Counter parameter
  • the terminal stores the second security parameter in the security context of the terminal.
  • the master station 1 After the master station 1 determines to switch the terminal's RRC state from the connected state to the third state, the master station 1 sends the suspend instruction information to the secondary station 1 through the inter-base station interface (such as the Xn interface).
  • the suspend instruction information is used for Suspend of data transmission between the secondary station 1 and the terminal.
  • the suspension indication information may be embodied in a direct (or called explicit) or indirect (or called implicit) manner, which is not specifically limited in this embodiment of the present application.
  • the suspension indication information may be carried in a secondary station modification (SN) modification message or a secondary station release (SN) release message of the Xn interface.
  • the primary station 1 may first send status switching instruction information to the terminal, and then send the suspension instruction information to the secondary station 1, or may first send the suspension instruction information to the secondary station 1, and then send the status switching instruction information to the terminal. It is also possible to send the suspension instruction information to the secondary station 1 while sending the state switching instruction information to the terminal, which is not specifically limited in this embodiment of the present application.
  • the master station 1 before sending the state switch to the terminal, the master station 1 needs to determine that no downlink data of the terminal is to be transmitted.
  • the primary station 1 For the data transmission on the primary station side (including MN bearer and SN bearer data transmitted through the air interface of the primary station), the primary station 1 can determine it by itself, but the primary station 1 cannot determine in real time whether the secondary station 1 has downlink data of the terminal to be transmitted, Especially for the SN bearer, the downlink data is sent directly to the secondary station 1 by the core network, and the primary station 1 cannot sense its data transmission situation.
  • the embodiment of the present application also provides a method for the master station 1 to determine whether the RRC state of the terminal can be switched from the connected state to the third state.
  • the method specifically includes: before sending the status switching instruction information to the terminal, the primary station 1 sends a pending demand indication to the secondary station 1 for inquiring whether the secondary station 1 can switch the terminal from the connected state to the third state; 1 allows the terminal to be switched from the connected state to the third state (optionally, if there is no uplink and downlink data of the terminal at the auxiliary station 1 within a preset time period, the auxiliary station 1 allows the terminal to be switched to the third state), The secondary station 1 sends a suspend confirmation instruction to the primary station 1 to instruct the secondary station to agree to switch the terminal from the connected state to the third state; otherwise, if the secondary station 1 is not allowed to switch the terminal to the third state, the secondary station 1 is sent to the primary station 1 Send a pending rejection indication.
  • the pending rejection indication may include a cause value indicating that there is still downlink data transmission of the terminal and / or further uplink data transmission of the terminal.
  • the pending rejection indication may further include bearer information for uplink and / or downlink data transmission of the terminal, such as a data radio bearer identifier, or a quality of service (QoS) flow identifier, or a packet data unit ( Packet Data Unit (PDU) session identification, etc.
  • bearer information for uplink and / or downlink data transmission of the terminal such as a data radio bearer identifier, or a quality of service (QoS) flow identifier, or a packet data unit ( Packet Data Unit (PDU) session identification, etc.
  • QoS quality of service
  • PDU Packet Data Unit
  • the terminal After receiving the state switching instruction information, the terminal switches its RRC state to the third state, and stores the configuration information 1 corresponding to the secondary station 1.
  • the configuration information 1 includes at least one of configuration information carried by the SCG and PDCP status carried by the SN.
  • the configuration information carried by the SCG may include any one or a combination of the following information: information of a serving cell set where the secondary station 1 serves the terminal, a DRB identifier, and an RLC configuration.
  • the serving cell set in the secondary station 1 includes at least one primary cell (also called Special Cell or PScell), and may also include one or more secondary cells.
  • the terminal after receiving the state switching instruction information, can also store the current security context, radio bearer configuration (SRB or DRB, the specific bearer type can be MN bearer or SN bearer), and C- used in the source cell.
  • SRB radio bearer configuration
  • DRB the specific bearer type can be MN bearer or SN bearer
  • C-RNTI At least one of RNTI (C-RNTI), the source PCell, the source cell's cell identity and the physical cell identity (the cell identity, the source identity, the PCell), and the terminal identity 1.
  • the radio bearer configuration may include any one or more of the following information: radio bearer identification, radio link control (RLC) protocol configuration, packet data convergence protocol PDCP configuration, and service data adaptation Protocol (Service Data Adaptation Protocol, SDAP) configuration.
  • RLC radio link control
  • PDCP packet data convergence protocol
  • SDAP service data adaptation Protocol
  • the current security context includes the initial MN basic key, the initial SN basic key, the initial MN security key, the initial SN security key, the initial MN security algorithm, the initial SN security algorithm, the next hop parameter (NH), and At least one of NCC.
  • the terminal suspends all SRBs (such as SRB1 and SRB2) and Data Radio Bearers (DRB) except for Signaling Radio Bearer (SRB) 0. ).
  • SRB for example, SRB1 or DRB
  • DRB Data Radio Bearers
  • the terminal considers the SN link (that is, the link for data transmission through the SCG) to be deactivated.
  • the terminal sends the first message to the master station 2, that is, after performing S804
  • the SRB (for example, SRB1) or DRB is resumed, and only the MN link (that is, the link for data transmission through the MCG) is restored, that is, Signaling or data transmission is performed through the MN link.
  • whether the SN link is restored later depends on the configuration information of the SN link sent by the master station 2.
  • the secondary station 1 After receiving the suspend instruction information, the secondary station 1 suspends data transmission between the secondary station 1 and the terminal.
  • the secondary station 1 sends a suspend response message to the primary station 1 to indicate that the data transmission between the secondary station 1 and the terminal has been suspended.
  • the suspend response message includes configuration information 2.
  • the configuration information 2 includes at least one for indicating configuration information carried by the secondary cell group SCG, configuration information carried by the SN, and PDCP status carried by the SN.
  • the configuration information carried by the SN includes at least one of a radio bearer identifier, a PDCP configuration, and an SDAP configuration.
  • the configuration information 2 may further include a random access resource allocated by the secondary station 1 to the terminal, so that the primary station 1 can store the random access resource allocated by the secondary station 1 to the terminal.
  • the primary station 2 or the primary station 1 no longer needs to send an interface message to the secondary station 1
  • the request for the random access resource saves the time delay for the terminal to obtain the random access resource and access the secondary station 1 according to the random access resource.
  • the secondary station 1 may update the random access resource to ensure the validity of the random access resource.
  • the process of updating the random access resource by the secondary station 1 may be periodic, or initiated by the secondary station 1, or may be requested by the primary station 1. This embodiment of the present application does not specifically limit this.
  • the secondary station 1 retains the configuration information 2.
  • the secondary station 1 retains the configuration information 2
  • Reconfiguration and / or re-establishment of the NG / Xn connection effectively improves the data transmission rate of the terminal using the secondary station air interface.
  • the secondary station 1 may delete part of the information in the configuration information 2.
  • the secondary station 1 deletes the configuration information carried by the SCG, and retains the configuration information carried by the SN and / or the PDCP status carried by the SN.
  • the secondary station 1 is composed of a Centralized Unit (CU) and a Distributed Unit (DU)
  • the CU may notify the DU to delete the terminal context stored on the DU, such as the configuration information carried by the SCG.
  • the secondary station 1 after receiving the suspension instruction information (for example, carried in the SN Release message), deletes the context of the terminal (including configuration information 2), and releases the secondary station 1 between the secondary station 1 and the primary station 1.
  • Dedicated resources allocated to the terminal on the interface between them such as the signaling connection dedicated to the terminal on the Xn interface control plane and the GPRS Tunneling Protocol (GTP) tunnel dedicated to the terminal on the Xn interface user plane) to release the auxiliary
  • the station 1 allocates dedicated resources for the terminal on the interface between the secondary station 1 and the 5GC (for example, it includes a GTP tunnel dedicated to the terminal on the NG interface user plane). This process is consistent with the process of releasing the secondary station for the terminal.
  • the secondary station 1 if the subsequent terminal recovers from the third state to the connected state, the secondary station 1 no longer continues to provide services to the terminal, and the primary station 1 does not need to instruct the secondary station 1 to delete the terminal context and interface dedicated resources, that is, there is no need to perform the following S915, S1018, or S1116.
  • the secondary station 1 suspends data transmission between the secondary station 1 and the terminal. It can be understood that the secondary station 1 stops data transmission with the terminal.
  • the master station 1 After receiving the suspend response message, the master station 1 stores the configuration information 2.
  • the primary station 1 and the secondary station 1 suspend communication with the terminal.
  • the core network is still The downlink data of the terminal will be sent to the primary station 1 or the secondary station 1.
  • the secondary station 1 reserves the dedicated resources allocated for the terminal on the interface between it and the core network
  • the secondary station 1 receives the downlink data from the terminal of the core network on the above interface, and the secondary station 1 sends the data to the primary station.
  • Station 1 sends a paging request indication, which is used to indicate that the master station has downlink data for the terminal to arrive.
  • the paging request indication carries data forwarding address request information and is used to request other base stations to provide a data forwarding address.
  • the data forwarding address request information may include at least one of the number of data forwarding addresses, information of a radio bearer performing data forwarding, information of a PDU session performing data forwarding, and information of a QoS flow performing data forwarding.
  • the master station 1 sends a paging message of the Xn interface to other base stations (for example, the master station 2) for other base stations to send paging messages on their respective air interfaces, so that the UE requests the third state to the connected state. Switch.
  • the paging message of the Xn interface may further include data forwarding address request information, which is used to request other base stations to provide a data forwarding address.
  • the data forwarding address request information may be provided by the secondary station, or may be generated by the primary station according to the downlink data received from the terminal of the core network by itself.
  • the master station 2 sends a context request message to the master station 1 which may carry a data forwarding address (for example, a downlink Xn interface user plane address) allocated to the terminal.
  • the master station 2 compares the terminal identifier 1 in the paging message of the interface with the terminal identifier 2 in the first message, so as to determine whether they are the same terminal.
  • the data forwarding address provided by the master station 2 may be the data forwarding address assigned by the master station 2 to the terminal, or the data forwarding address assigned by the slave station 2 requested by the master station 2 to the slave station 2 for the terminal.
  • the primary station 1 if the paging request indication sent by the secondary station 1 to the primary station 1 includes data forwarding address request information, the primary station 1 sends the data forwarding address received from the primary station 2 to the secondary station 1 for the secondary station 1 Data is forwarded to the master station 2 and the slave station 2 according to the address.
  • the terminal sends a first message to the master station 2 to request the terminal to switch from the third state to the connected state.
  • the terminal in the third state performs cell reselection during the movement process, and camps on the selected first cell.
  • the terminal needs to send the first message to the master station 2 (the access network device to which the first cell belongs).
  • the first message is specifically used to request to recover the RRC connection of the terminal or to update the location area (such as RNAU or TAU) of the terminal.
  • the first message may be a third message (Message 3 or MSG3) in the random access procedure, and the MSG3 may be an RRC Connection Resume Request or an RRC Resume Request.
  • MSG3 may be an RRC Connection Resume Request or an RRC Resume Request.
  • the first message includes a terminal identifier 2 and a security check parameter.
  • the terminal identifier 2 may be the same as the terminal identifier 1, or may be a part of the terminal identifier 1.
  • the security check parameters are used by the master station 2 to verify the legitimacy of the terminal. Specifically, the terminal derives the security verification parameter based on the current MN security key. In an optional manner, after deriving the first MN basic key for communication with the master station 2 based on the second security parameter, the terminal derives the first MN basic key for communication with the master station 2 based on the first MN basic key. The MN security key, and uses the first MN security key as the current MN security key. In another optional manner, the terminal uses the initial MN security key that communicates with the master station 1 as the current MN security key, for example, the current MN security key is used as the integrity protection key for RRC signaling.
  • the first message further includes first information, and the first information is used by the primary station 2 to determine a secondary station that provides services to the terminal.
  • the first information in this application is obtained by the terminal in the third state performing measurement according to the measurement configuration.
  • the measurement configuration includes at least one or any combination of the following information: information of the measurement auxiliary station, information of the measurement cell, measurement quantity, preset frequency, and preset rule.
  • the information of the measurement auxiliary station is used to indicate the base station that the terminal needs to measure, and may include a base station identifier and / or an index value corresponding to the base station.
  • the information of the measurement cell is used to indicate the base station that the terminal needs to measure. It may be a cell provided by the measurement secondary station or any cell that does not distinguish the base station to which it belongs, and may include a cell identifier and / or an index value corresponding to the cell.
  • the measurement value is used to indicate the attribute of the signal to be measured by the terminal or the specific measurement value to be obtained.
  • the measurement value can be an RRC measurement value (layer 3 measurement) or a Media Access Control (MAC) measurement value (layer 2).
  • the measurement value can also be the reference signal received power (RSRP), the reference signal reception quality (RSRQ), or the beam correlation measurement value.
  • the preset frequency point is used to instruct the terminal to measure a cell at the frequency point.
  • the preset rule is used to instruct the terminal to evaluate a cell or a base station that meets the rule based on the rule, for example, the preset rule is a cell whose signal quality is higher than a preset threshold.
  • the terminal receives the measurement configuration sent by the master station 1 through terminal-specific signaling, and the terminal-specific signaling may be an RRC Connection Release message or an RRC Release Message.
  • the terminal receives an RRC Connection Release message carrying the measurement configuration and state switching instruction information sent by the master station 1.
  • the terminal obtains the measurement configuration by reading a system broadcast message.
  • the terminal uses the dedicated signaling to obtain the measurement configuration.
  • Another possible way for the terminal to obtain the measurement configuration is: When the terminal in the third state moves to a new cell and acquires the measurement configuration from the new cell, the terminal discards the measurement configuration that it has previously acquired and uses it to restart The measurement configuration acquired by the cell.
  • the first information includes channel quality of each measurement cell in at least one measurement cell; or the first information is used to indicate that the secondary station serving the terminal is the secondary station 1; or the first information is used to Indicating that the secondary station serving the terminal is the secondary station 1 and a cell in the secondary station 1 that meets a preset condition; or the first information is used to indicate that the secondary station serving the terminal is the secondary station 2.
  • the “channel quality of each measurement cell in the at least one measurement cell” may be an RRC layer measurement result or a MAC layer measurement result.
  • the "channel quality of each measurement cell in at least one measurement cell” is a measurement result of the RRC layer
  • the "channel quality of each measurement cell in at least one measurement cell” is carried in the RRC message.
  • the measurement result of the MAC layer may be a channel quality indication (Channel Quality Indication, CQI) measurement result.
  • CQI Channel Quality Indication
  • the channel quality of each of the at least one measurement cell in the embodiments of the present application is measured by the terminal before sending the first message. That is, when measuring the channel quality of each measurement cell, the terminal in the embodiment of the present application is in a third state.
  • the measurement cell may be a primary cell of the secondary station 1, a cell of a preset frequency point, or a cell designated by a base station (such as the secondary station 1), which is not specifically limited in this embodiment of the present application.
  • the serving cell of the terminal in the connected state includes multiple secondary station 1 cells, that is, the Secondary cell group includes the primary cell and at least one secondary cell
  • the terminal considers the measurement cell to be the primary cell, and the secondary cell is deactivated.
  • the measurement cell is a cell designated by the base station (such as the primary cell or the secondary cell of the secondary station 1), other unspecified cells (such as the serving cell of the secondary station 1) in the secondary station 1 are considered to be deactivated.
  • the measurement cell needs to provide a terminal with a signal to be measured.
  • the measurement cell is the primary cell of the secondary station 1
  • the primary cell of the secondary station 1 may continuously provide a dedicated measurement signal to the terminal.
  • the terminal may compare the channel quality of each measurement cell with a preset threshold, and belong to the measurement cell whose channel quality is greater than the preset threshold.
  • the station determines the secondary station serving the terminal, and sends the determination result to the primary station 2. That is, the first information may be used to indicate that the secondary station serving the terminal is the secondary station 1, or used to indicate that the secondary station serving the terminal is the secondary station 2.
  • the first information may be a site index, a site identifier, or other information used to uniquely identify the site, which is not specifically limited in this embodiment of the present application.
  • the terminal may also determine a cell in the secondary station that satisfies a preset condition.
  • the preset condition here may be a condition for the terminal to receive from the secondary station 1, or may be preset for the system.
  • the first information may be used to indicate the secondary station serving the terminal and a cell in the secondary station that meets a preset condition.
  • the first information may include a cell identifier or a cell index list.
  • the cell index value in the cell index list may be assigned to the base station to which the cell belongs.
  • the first information is specifically used to indicate that the secondary station serving the terminal is the secondary station 1, and the preset conditions are satisfied in the secondary station 1. Community.
  • the first information may only include information of a cell that satisfies a preset condition among the secondary stations serving the terminal, so that the first information may implicitly indicate the secondary station serving the terminal.
  • the auxiliary station serving the terminal may be the auxiliary station 1 or the auxiliary station 2.
  • the measurement cell in the embodiment of the present application includes a part of the cell in the secondary station 1 and a part of the cell in the secondary station 2.
  • the first information in the embodiment of the present application may also be used to indicate that the secondary station serving the terminal is not the secondary station 1 and the channel quality of each measurement cell in at least one measurement cell.
  • the primary station 1 After receiving the first information, the secondary station that provides services to the terminal may be determined according to the first information.
  • the first information When the first information is used to indicate that the secondary station serving the terminal is not the secondary station 1 and the channel quality of each measurement cell in at least one measurement cell, the first information may be carried in the first message. Some information (such as information used to indicate that the secondary station serving the terminal is not secondary station 1) may be carried in the first message, and other information (such as the channel quality of each measurement cell in at least one measurement cell) In message 7.
  • Some information such as information used to indicate that the secondary station serving the terminal is not secondary station 1
  • other information such as the channel quality of each measurement cell in at least one measurement cell
  • the first message in the embodiment of the present application may not carry the first information.
  • the master station 2 determines whether to accept the request from the terminal, and after determining to accept the request from the terminal, sends an instruction to the terminal to indicate The message that the connection between the master station 2 and the terminal was restored successfully. Subsequently, the terminal sends the first information to the master station 2.
  • the master station 2 determines a secondary station that provides services to the terminal.
  • the first message includes first information, the first information includes channel quality of each measurement cell in at least one measurement cell, or the first information is used to indicate that the secondary station that provides services to the terminal is the secondary station 1, Alternatively, the first information is used to indicate that the secondary station serving the terminal is the secondary station 1 and a cell in the secondary station 1 that meets a preset condition, or the first information is used to instruct the terminal to provide the service to the terminal.
  • the primary station 2 determines the secondary station that provides services to the terminal according to the first information.
  • the master station 2 when the first information includes a base station index or a cell index, the master station 2 also needs to obtain a correspondence between the index value and the base station identifier. If the master station 1 is configured with the correspondence between the index value and the base station identifier, the master station 1 needs to send the correspondence to the master station 2. Specifically, when the master station 1 sends the terminal context to the master station 2, the correspondence relationship is also sent at the same time.
  • the primary The station 2 determines a secondary station serving the terminal according to the channel quality of each of the at least one measurement cell in the message 7. In this case, reference may be made to the description of FIG. 10 below.
  • the master station 2 receives the first message sent by the terminal after sending a message to the terminal indicating that the connection between the master station 2 and the terminal is successfully restored, and according to the first message, A message determines the secondary station serving the terminal.
  • a message determines the secondary station serving the terminal.
  • the master station 2 obtains the first security parameter.
  • the first security parameter is used to derive a security key used by the terminal to communicate with the secondary station that provides services to the terminal.
  • the master station 2 may determine the first security parameter after determining the secondary station serving the terminal, or may obtain the first security parameter from the terminal context.
  • the master station 2 When the context of the terminal is not stored by the master station 2, the master station 2 sends a context request message to the master station 1 to obtain the context of the terminal, and then the master station 2 obtains the first security parameter from the context of the terminal. In this scenario, the master station 1 needs to determine the first security parameter and store it in the context of the terminal. The master station 1 may also send the first security parameter to the terminal through the message 1, so that the terminal stores the first security parameter.
  • the master station 2 obtains configuration information of the SCG.
  • the SCG configuration information includes random access resources allocated by the secondary station serving the terminal to the terminal, information of a serving cell set in the secondary station serving the terminal, and the primary of the secondary station serving the terminal. At least one of indication information of a cell.
  • the master station 2 obtains the context of the terminal, and obtains the configuration information of the SCG based on the context of the terminal.
  • the context of the terminal includes the wireless access capability information of the terminal (such as UE-Radio Access Capability Info), the security context of the terminal, the RRC configuration information of the terminal (such as AS-Config), and the wireless management control configuration of the terminal (such as RRM -Config), at least one of a random access resource allocated by the secondary station 1 to the terminal, a terminal identifier 1, configuration information 2 and a first terminal identifier used to indicate the terminal.
  • the first terminal identifier is used by the secondary station 1 to identify the terminal.
  • the security context of the terminal includes: the initial MN basic key, the initial SN basic key, the initial MN security key, the initial MN security algorithm, the initial SN security key, the initial SN security algorithm, NH, NCC, SN security parameters, At least one of a first security parameter, a first MN base key, a first MN security key, and a second security parameter.
  • the first terminal identifier may be an interface identifier allocated by the secondary station 1 to the terminal on the interface between the secondary station 1 and the primary station 1, for example, the UE XnAP ID on the secondary station 1 side.
  • the master station 2 obtains the configuration information of the SCG according to the context of the terminal.
  • the master station 1 has sent the context of the terminal to the master station 2
  • the master station 2 directly obtains the configuration information of the SCG according to the context of the terminal stored by itself. If the master station 2 does not store the context of the terminal, the master station 2 sends a context request message to the device storing the context of the terminal to obtain the context of the terminal.
  • a device in which the context of the terminal is not stored by the master station 2 and the context of the terminal is stored as the master station 1 is used as an example for description.
  • the master station 2 sends a context request message for requesting the context of the terminal to the master station 1, and accordingly, the master station 2 receives the context of the terminal from the master station 1.
  • the first MN basic key included in the context of the terminal is derived by the master station 1 according to the second security parameter.
  • the master station 1 may derive the first MN base key after receiving the context request message.
  • the context request message may further include the cell identity and frequency information of the master station 2 so that the master station 1 derives the first MN basic key.
  • the master station 1 may also derive and store the first MN base key before receiving the context request message.
  • the first MN basic key has nothing to do with the cell identity and frequency point information.
  • the master station 2 sends the message 2 including the first terminal identifier to the secondary station 1 after obtaining the context of the terminal, Configuration for requesting secondary station 1 to allocate SCG.
  • the secondary station 1 determines the SCG configuration information (for example, the secondary station 1 allocates random access resources to the terminal, determines the information of the serving cell set and the primary cell, etc.), and then the secondary station 1 sends the SCG configuration information.
  • the secondary station 1 Since the first terminal identifier may be the terminal identifier of the inter-site interface, when the first terminal identifier is the unique identifier of the interface, in order for the secondary station 1 to identify the terminal based on the first terminal identifier, the secondary station 1 also needs to know The identity of the opposite site corresponding to a terminal identity, such as the identity of the master station 1. Exemplarily, when the first terminal is identified by the UE XnAP ID on the secondary station 1, the secondary station 1 can identify the terminal by using the identifier of the primary station 1 and the UE XnAP ID on the secondary station 1.
  • the primary station 2 obtains the first SN basic key based on the first security parameter and the first MN basic key.
  • the primary station 2 sends a message 3 including the configuration information 2 to the secondary station 2 to request the secondary station 2 to allocate the configuration of the SCG.
  • the message 3 may further include a first SN basic key.
  • the secondary station 2 determines the configuration information of the SCG based on the configuration information 2 (for example, the secondary station 2 allocates random access resources to the terminal, determines the serving cell set information, and the primary cell, etc.), and then the secondary station 2 sends The master station 2 sends the configuration information of the SCG.
  • the secondary station 2 may determine the configuration information of the SCG based on at least one of the information for the capability negotiation, the information for the measurement configuration negotiation, the information carried by the SN, the configuration information carried by the SN, and the SCG configuration information in the configuration information 2.
  • the configuration information of the SCG includes any one or a combination of any of the following information: a cell radio network temporary identifier (C-RNTI) assigned by the secondary station to the terminal, and the secondary station assigned to the terminal Random access resources, the information of the serving cell set provided by the secondary station for the terminal, and the primary cell provided by the secondary station for the terminal.
  • C-RNTI cell radio network temporary identifier
  • the secondary station 2 applies the PDCP status carried by the SN in the configuration information 2.
  • the serial number in the PDCP state continues to be used. In this way, it can be ensured that after the terminal resumes data transmission, the transmission of the data packets carried by the SN can still be in order.
  • the message 3 also includes the first SN basic key, the terminal's security capabilities, the initial SN security algorithm, and the identifier (e.g., MN) allocated by the master station 2 for the terminal on the interface between the master station 2 and the secondary station 2.
  • UE XnAP ID The security capability of the terminal and the initial SN security algorithm can be used for the secondary station 2 to configure a first SN security algorithm for the terminal.
  • the secondary station 2 configures the terminal to select the first SN security algorithm based on the terminal's security capabilities and its own security algorithm, and notifies the terminal of the first SN security algorithm.
  • the secondary station 2 when the first SN security algorithm selected by the secondary station 2 for the terminal is the same as the initial SN security algorithm of the terminal, the secondary station 2 does not need to send an instruction to the terminal. At this time, the terminal defaults to the initial SN security in the current security context.
  • the algorithm serves as the first SN security algorithm; when the first SN security algorithm selected by the secondary station 2 for the terminal is different from the initial SN security algorithm, the secondary station 2 carries the first SN security algorithm in the SCG configuration information and is sent by the primary station 2 To the terminal. That is, the first SN security algorithm may be a display or an implicit indication. For example, if the configuration information of the SCG does not indicate the first security algorithm, it means that the first SN security algorithm is the same as the initial SN security algorithm.
  • the master station 2 sends a second message including the first security parameter and the configuration information of the SCG to the terminal.
  • the master station 2 obtains the first MN security algorithm used for communication with the terminal, and obtains the first MN security key according to the first MN basic key and the first MN security algorithm. In this way, the master station 2 can use the first MN security key to perform security protection on the second message.
  • the master station 2 may determine the first MN security algorithm by itself, or determine the initial MN security algorithm as the first MN security algorithm, which is not specifically limited in this embodiment of the present application.
  • the second message further includes a first MN security algorithm and / or a second security parameter, for the terminal to derive the first MN basic key and / or the first MN security key.
  • the second message may be used to indicate that the connection between the master station 2 and the terminal is restored. Succeeded, the second message is the fourth message (Message 4 or MSG 4) in the random access process.
  • MSG4 is an RRC Connection Resume message, or an RRC Resume message, an RRC reconfiguration value message, or an RRC connection reconfiguration message.
  • the second message may be an RRC reconfiguration value message or an RRC connection reconfiguration value message.
  • the terminal After receiving the second message, the terminal completes the communication connection with the secondary station that provides services to the terminal according to the first security parameter and the configuration information of the SCG.
  • the terminal derives a first SN basic secret key according to the received first security parameter and the first MN basic key, so that the terminal can obtain the first SN basic key according to the first SN basic key and the first SN security algorithm.
  • the first SN security key The terminal can quickly establish a communication connection with the secondary station that provides services to the terminal according to the first SN security key and the configuration information of the SCG.
  • the terminal derives the first MN basic secret key based on the second security parameter.
  • the terminal obtains the first MN basic key based on the received NCC and the NH stored by the terminal.
  • some / all of the information in the configuration information of the SCG may be the same as some / all of the information in the configuration information 1.
  • the efficiency of the terminal in establishing a communication connection with the secondary station serving the terminal will be further improved. improve.
  • the terminal in this application can obtain the first security parameter and the configuration information of the SCG at the same time, so that the terminal can directly complete the communication with the auxiliary station that provides services to the terminal according to the first security parameter and the configuration information of the SCG.
  • the communication connection effectively improves the rate of configuring SCG when the terminal recovers from the third state to the connected state, which further improves the terminal's efficiency of data transmission by using the air interface of the secondary station.
  • the master station 2 in the embodiment of the present application may also directly send the first security parameter to the terminal (that is, the first security parameter and the configuration information of the SCG are carried in different messages), In order to facilitate the subsequent protection of communication data when the terminal communicates with the secondary station that provides services to the terminal.
  • the embodiment of the present application uses the first security parameter and the configuration information of the SCG to be carried in the second message as an example for description.
  • the first information in the embodiments of the present application may be carried only in the first message or message 7, or a part of the first information is carried in the first message and the remaining part is carried in message 7. Each case is described separately.
  • FIG. 9 shows Communication method flow.
  • the communication method includes S800 to S803 and S901 to S915.
  • S800 to S803 can refer to the above description, and will not be described in detail here.
  • S901 ⁇ S915 are introduced.
  • the terminal sends a first message including the first information to the master station 2 to request the terminal to switch from the third state to the connected state.
  • the master station 2 determines whether the context of the terminal is stored.
  • the master station 2 In response to the first message, the master station 2 needs to determine whether to accept the request of the terminal according to the context of the terminal.
  • the master station 2 accepts the request of the terminal, and the master station 2 subsequently determines that the service is provided for the terminal. Whether the secondary station has changed, that is, the primary station 2 sequentially executes S905. If the master station 2 does not store the context of the terminal, the master station 2 sends a context request message to the master station 1 to obtain the context of the terminal, that is, S903 is performed sequentially.
  • the master station 2 sends a context request message to the master station 1, requesting to obtain the context of the terminal.
  • the master station 2 identifies the station storing the context of the terminal based on the terminal identifier 2 in the first message. Take the station storing the context of the terminal as the master station 1 as an example. Specifically, the master station 2 sends a context request message to the master station 1 to request the context of the terminal.
  • the context request message may include a terminal identification 2 used by the master station 1 to identify the terminal, and a security verification parameter used by the master station 1 to verify the terminal.
  • the master station 1 sends the context of the terminal to the master station 2.
  • the master station 1 verifies the terminal according to the security verification parameter in the context request message. If the check passes, the master station 1 sends the terminal context to the master station 2.
  • the context of the terminal reference may be made to the description of the context of the terminal in S807, which is not repeated here.
  • the master station 2 obtains a first MN basic key.
  • the master station 2 may obtain the first MN basic key from the context of the terminal, that is, the master station 1 derives the first basic key and sends it to the master station 2.
  • the master station 2 can also obtain the NH and the second security parameter from the core network, and derive the first MN basic key.
  • the master station 2 determines a secondary station that provides services to the terminal according to the first information, and obtains a first security parameter.
  • the primary station 2 After determining the secondary station serving the terminal, the primary station 2 obtains the first security parameter related to the station.
  • the primary station 2 may obtain the first security parameter from the context of the terminal; the secondary station serving the terminal is the secondary station 2, the master station 2 determines the first safety parameter by itself.
  • both the primary station 2 determines the first security by itself The parameters reduce the delay of the master station 2 in determining which device the secondary station serving the terminal is.
  • the primary station 2 can determine that the secondary station 1 is a secondary station that provides services to the terminal before the terminal enters the third state according to the terminal context Station, after the primary station 2 determines the secondary station serving the terminal according to the first information, the primary station 2 determines whether the secondary station serving the terminal is the secondary station 1. If the secondary station serving the terminal is the secondary station 1, the primary station 2 performs S907 and S908 sequentially; if the secondary station serving the terminal is the secondary station 2, the primary station 2 performs S909.
  • the secondary station 1 described in the above S803 deletes the context of the terminal, releases the dedicated resources allocated by the secondary station 1 to the terminal on the interface between the secondary station 1 and the primary station 1, and releases the secondary station 1 in the secondary station
  • the master station 2 does not need to determine whether the slave station serving the terminal is the slave station 1, and the master station 2 sequentially executes S909.
  • the master station 2 in the embodiment of the present application may execute S903 first, then S906, or S906 first, and then S903, and may also execute S903 and S906 at the same time. This embodiment of the present application does not specifically limit this.
  • the primary station 2 sends a message 2 to the secondary station 1.
  • the message 2 includes at least one of the first terminal identification and the configuration information 2.
  • the message 2 may further include at least one of the identity of the master station 1 and the terminal identity 1.
  • the secondary station 2 can obtain the context of the terminal according to the information in the message 2.
  • the secondary station 1 sends the configuration information of the SCG to the terminal.
  • the communication method provided in the embodiment of the present application sequentially executes S911 after executing S908.
  • the primary station 2 sends a message 3 including the configuration information 2 to the secondary station 2.
  • S909 and S910 are sequentially performed after S906.
  • the message 3 may further include at least one of a first SN basic key, a terminal security capability, an initial SN security algorithm, and an identifier allocated by the master station 2 for the terminal on the interface between the master station 2 and the slave station 2. .
  • the message 3 may further include the channel quality of each of the at least one measurement cell.
  • the message 3 may further include information of the cell.
  • the secondary station 2 sends the SCG configuration information to the primary station 2.
  • the configuration information of the SCG is carried in message 5.
  • the communication method provided in the embodiment of the present application sequentially executes S911 after executing S910.
  • the master station 2 sends a second message including the first security parameter and the configuration information of the SCG to the terminal.
  • S912 The terminal derives a first SN basic key according to the first security parameter, and determines a first SN security key according to the first SN basic key.
  • the terminal establishes a communication connection with the secondary station that provides services to the terminal according to the first SN security key and the configuration information of the SCG.
  • the terminal when the secondary station serving the terminal is the secondary station 1, the terminal establishes a communication connection with the secondary station 1 according to the first SN security key and the configuration information of the SCG.
  • the terminal When the secondary station serving the terminal is the secondary station 2, the terminal establishes a communication connection with the secondary station 2 according to the first SN security key and the configuration information of the SCG.
  • the communication method provided in the embodiment of the present application may further include S914 and S915.
  • the master station 2 sends the first instruction information to the master station 1.
  • the first instruction information is used to indicate that the secondary station serving the terminal is the secondary station 1, or the first instruction information is used to indicate that the secondary station serving the terminal is not the secondary station 1.
  • the first indication information may be expressed by a preset numerical value (for example, 1-bit information), or may be an identifier of an auxiliary station or an index of the auxiliary station, which is not specifically limited in this embodiment of the present application.
  • the first indication information may be carried in the context request message.
  • the primary station 1 sends delete release instruction information / reservation release instruction information to the secondary station 1.
  • the primary station 1 when the first instruction information indicates that the secondary station serving the terminal is not the secondary station 1, the primary station 1 sends delete release instruction information to the secondary station 1, so that the secondary station 1 deletes the terminal's context and releases The secondary station 1 allocates dedicated resources for the UE on the interface with the primary station 1 and releases the dedicated resources allocated for the UE by the secondary station 1 on the interface between the secondary station 1 and the 5GC.
  • the primary station 1 sends reservation release indication information to the secondary station 1, so that the secondary station 1 retains the context of the terminal and releases the secondary station 1 and the primary station 1.
  • S914 and S915 are optional, therefore, they are indicated by dashed lines in FIG. 9.
  • the master station 2 can directly determine the secondary station serving the terminal according to the first information in the first message, and simultaneously send the SCG configuration information and the first to the terminal.
  • the security parameters enable the terminal to quickly recover the communication connection with the auxiliary station serving the terminal.
  • FIG. 10 The flowchart of the communication method provided in the present application is shown.
  • this method is particularly applicable to the scenario where the secondary station 1 reserves the terminal context, that is, the secondary station 1 reserves the terminal context in S803, and reserves the secondary station 1's assigned interface for the UE on the interface between the secondary station 1 and the primary station 1.
  • Dedicated resources a scenario in which dedicated resources allocated by the secondary station 1 to the UE on the interface between the secondary station 1 and the 5GC are reserved.
  • the communication method includes S800 to S803 and S1001 to S1018.
  • S800 to S803 can refer to the above description, and will not be described in detail here.
  • S1001 ⁇ S1018 are introduced now.
  • the terminal sends a first message including the first indication information to the master station 2 to request the terminal to switch from the third state to the connected state.
  • the first indication information is used to indicate whether the secondary station providing services to the terminal is the secondary station 1.
  • the terminal When the terminal is in the third state, it can measure the channel quality of each measurement cell in at least one measurement cell, and determine whether the secondary station serving the terminal is the secondary station 1 according to the measurement result, that is, the first An instruction message.
  • the measurement result that is, the first An instruction message.
  • the measurement cell For the description of the measurement cell, reference may be made to the description of the measurement cell in S804, and details are not described herein again.
  • the master station 2 determines whether a terminal context is stored.
  • S1002 may refer to the above S902. If the context of the terminal is stored in the master station 2 and the verification result of the verification by the master station 2 on the terminal is successful, the master station 2 accepts the request from the terminal, and the master station 2 subsequently judges the secondary station serving the terminal. Whether the change occurs, that is, the master station 2 executes S1005 in sequence. If the master station 2 does not store the context of the terminal, the master station 2 sends a context request message to the master station 1 to obtain the context of the terminal, that is, S1003 is executed sequentially.
  • the master station 2 sends a context request message to the master station 1 to request the context of the terminal.
  • the master station 2 When the context of the terminal is not stored in the master station 2, the master station 2 sends a context request message to the master station 1.
  • S1003 refer to the above S903, which will not be described in detail here.
  • the master station 1 sends the context of the terminal to the master station 2.
  • the master station 2 obtains a first MN basic key.
  • S1005 may refer specifically to the above S905.
  • the master station 2 obtains the first security parameter from the context of the terminal.
  • the primary station 2 sends a message 2 to the secondary station 1.
  • the secondary station 1 sends the configuration information of the SCG to the terminal.
  • the master station 2 sends a second message including the first security parameter and the configuration information of the SCG to the terminal.
  • the terminal derives a first SN basic key according to the first security parameter, and determines a first SN security key according to the first SN basic key.
  • the terminal establishes a communication connection with the secondary station that provides services to the terminal according to the first SN security key and the configuration information of the SCG.
  • the master station 2 sends a message 6 to the terminal.
  • message 6 is used to indicate the successful completion of the connection restoration between the terminal and the master station 2.
  • message 6 can be an RRC Resume message, an RRC Connection Resume message, an RRC Reconfiguration message, or an RRC Connection ReReconfiguration message. ) Message.
  • the message 6 is also used to instruct the terminal to report auxiliary information for selecting a new secondary station.
  • the terminal sends a message 7 including the channel quality of each of the at least one measurement cell to the master station 2.
  • the message 7 may be used to indicate that the terminal has completed connection restoration with the master station 2.
  • message 7 can be an RRC Resume Complete message, an RRC Connection Resume Complete message, an RRC Reconfiguration Complete message, or an RRC Connection Complete message.
  • Reconfiguration Complete RRC Connection Reconfiguration Complete
  • the message 7 may also be a message for reporting a measurement result, for example, a Measurement Report message.
  • the channel quality of each measurement cell in the at least one measurement cell is measured when the terminal is in the third state, which effectively reduces the rate at which the terminal recovers the connection to the secondary station.
  • the measurement cell reference may be made to the description of the measurement cell in S804, and details are not described herein again.
  • the master station 2 determines a secondary station that provides services to the terminal according to the channel quality of each of the at least one measurement cell.
  • the secondary station 2 is described as an example of the secondary station providing services for the terminal. After determining the secondary station 2, the primary station 2 determines the first safety parameter.
  • the primary station 2 sends a message 3 including the configuration information 2 to the secondary station 2.
  • the secondary station 2 sends the configuration information of the SCG to the primary station 2.
  • the communication method provided in the embodiment of the present application may further include S1017 and S1018.
  • the master station 2 sends the first instruction information to the master station 1.
  • the primary station 1 sends delete release instruction information / reservation release instruction information to the secondary station 1.
  • the primary station 1 sends deletion release instruction information to the secondary station 1, so that the secondary station 1 deletes the configuration information 2 and releases Connection between secondary station 1 and primary station 1.
  • the primary station 1 sends the reserved release indication information to the secondary station 1, so that the secondary station 1 retains the configuration information 2 and releases the secondary station 1 and the primary station 1. Between connections. This can effectively reduce the occupation rate of resources.
  • S1017 and S1018 are optional, so they are indicated by dashed lines in Figure 10.
  • the terminal when the terminal is in the third state, the channel quality of each measurement cell is measured.
  • the master station 2 needs to obtain the measurement quality of each measurement cell in at least one measurement cell.
  • the terminal can directly send the channel quality of each measurement cell to the master station 2, thereby improving the rate at which the terminal recovers the communication connection with the secondary station serving the terminal.
  • FIG. 11 shows a flow of a communication method provided by the present application.
  • the communication method includes S800 to S803 and S1101 to S1116.
  • S800 to S803 can refer to the above description, and will not be described in detail here.
  • S1101 ⁇ S1116 are introduced now.
  • the terminal sends a first message not including the first information to the master station 2 to request the terminal to switch from the third state to the connected state.
  • the master station 2 determines whether a terminal context is stored.
  • S1102 may refer to the above S902. If the context of the terminal is stored in the master station 2 and the verification result of the verification of the terminal by the master station 2 is successful, the master station 2 accepts the request of the terminal and sends a message 6 to the terminal, that is, the master station 2 executes S1105 in sequence. If the master station 2 does not store the context of the terminal, the master station 2 sends a context request message to the master station 1 to obtain the context of the terminal, that is, S1103 is performed sequentially.
  • the master station 2 sends a context request message to the master station 1 to request to obtain the context of the terminal.
  • the master station 1 sends the context of the terminal to the master station 2.
  • S1104 can refer to the above S904, which will not be described in detail here.
  • the master station 2 sends a message 6 to the terminal.
  • message 6 After determining that the master station 2 accepts the request from the terminal, it sends a message 6 to the terminal.
  • This message 6 is used to indicate the completion of the connection restoration between the terminal and the master station 2.
  • message 6 can be an RRC Resume message, an RRC Connection Resume message, an RRC Reconfiguration message, or an RRC Connection ReReconfiguration message. ) Message.
  • the message 6 is also used to instruct the terminal to report first information for selecting a new secondary station.
  • the terminal sends a message 7 including the first information to the master station 2.
  • the message 7 may be used to indicate that the terminal has completed the connection restoration with the master station 2.
  • the message 7 may be an RRC Resume Complete message or an RRC connection restoration completed Resume Complete) message can also be an RRC Reconfiguration Complete (RRC Reconfiguration Complete) message, and can also be an RRC Connection Reconfiguration Complete (RRC Connection Reconfiguration Complete) message.
  • the message 7 may also be a message for reporting a measurement result, for example, a Measurement Report message.
  • the first information here is determined when the terminal is in a third state.
  • Message 7 is similar to the first message in S901 described above, and details are not described herein again.
  • the master station 2 determines a secondary station that provides services to the terminal according to the first information, and obtains a first security parameter.
  • the primary station 2 performs S1108 and S1109 in sequence; if the secondary station serving the terminal is the secondary station 2, the primary station 2 performs S1110 and S1111.
  • the primary station 2 sends a message 2 to the secondary station 1.
  • the secondary station 1 sends the configuration information of the SCG to the terminal.
  • the primary station 2 sends a message 3 including the configuration information 2 to the secondary station 2.
  • the secondary station 2 sends the configuration information of the SCG to the primary station 2.
  • S1111 can refer to the above S910, which will not be described in detail here.
  • the master station 2 sends a second message including the first security parameter and the configuration information of the SCG to the terminal.
  • S1112 can refer to the above S911, which will not be described in detail here.
  • S1113 The terminal derives the first SN basic key according to the first security parameter, and determines the first SN security key according to the first SN basic key.
  • the terminal establishes a communication connection with the secondary station that provides services to the terminal according to the first SN security key and the configuration information of the SCG.
  • S1114 can refer to the above S913, and will not be described in detail here.
  • the communication method provided in the embodiment of the present application may further include S1115 and S1116.
  • the master station 2 sends the first instruction information to the master station 1.
  • the primary station 1 sends delete release instruction information / reservation release instruction information to the secondary station 1.
  • S1116 can refer to the above S915, which will not be described in detail here.
  • S1115 and S1116 are optional, so they are indicated by dashed lines in Figure 11.
  • the first information is determined when the terminal is in the third state, and the master station 2 may directly determine the secondary station that provides services to the terminal according to the first information in the message 7, and At the same time, the SCG configuration information and the first security parameter are sent to the terminal, so that the terminal can quickly restore the communication connection with the secondary station that provides services to the terminal.
  • the secondary station 1 in the embodiment of the present application may also send the configuration information 2 to the primary station 1 and delete the configuration information 2 stored by itself. In this way, the secondary station 1 no longer needs to maintain the configuration information 2.
  • the processing of other devices in the communication method provided by the embodiment of the present application is similar to the above description, and details are not described herein again.
  • FIG. 8, FIG. 9, and FIG. 10 are also applicable to the case of terminal location area update (such as RAN Network Update, RANU), that is, the first message sent by the terminal is specifically used to request an update.
  • Location area of the terminal e.g., RNAU.
  • the master station 2 does not need to select a secondary station serving the terminal, and the terminal does not need to provide the first information. Therefore, it is not necessary to execute the above S805 to S809, S905 to S913, S1005 to S1016, S1107 to S1114.
  • the context of the terminal is reserved on the secondary station 1, the dedicated resources allocated for the terminal on the interface between the secondary station 1 and the primary station 1, and the interface between the secondary station 1 and the 5GC are reserved.
  • the first instruction information sent by the master station 2 to the master station 1 is used to indicate the location area of the terminal that is requested to be updated (for example, the reason value carrying the RNAU), and the master station 1 sends to the slave station 1 Delete release instruction information, used to instruct the secondary station 1 to delete the context of the terminal, and release the dedicated resources allocated by the secondary station 1 to the UE on the interface between the secondary station 1 and the secondary station 1 between the 5GC and the 5GC.
  • Dedicated resources allocated for the UE on the interface are reserved.
  • the first indication information may be carried in a context request message. If the security verification of the primary station 1 is successful, the deletion release instruction information is sent to the secondary station 1.
  • the master station 2 sends a Path Update (Path Switch) request to the core network, which carries a Packet Data Unit (PDU) session carried by the SN ( session) identifier, and the dedicated resources allocated by the master station 2 to the UE on the interface between the master station 2 and the 5GC (such as the downlink NG interface user plane address) for the 5GC to save it with the SN bearer
  • the corresponding secondary station 1 allocates dedicated resources (such as the downlink NG interface user plane address) for the UE on the interface between the 5GC and the primary station 2 on the interface between the 5GC and the 5GC. Resources.
  • the method for updating the path of the location area update may be used independently as a separate method, or may be used in combination with other steps in the embodiment of
  • the embodiment of the present application provides a communication device 12.
  • the communication device 12 may be a base station, such as an eLTE eNB or gNB, or a part of the base station, such as a chip system in the base station.
  • the chip system is configured to support a base station to implement the functions involved in the foregoing method embodiments, for example, to receive, send, or process data and / or information involved in the foregoing methods.
  • the chip system includes a chip, and may also include other discrete devices or circuit structures.
  • the communication device 12 is configured to perform the steps performed by the primary station 1, the primary station 2, the secondary station 1, or the secondary station 2 in the above communication method.
  • the communication device 12 provided in the embodiment of the present application may include a module corresponding to a corresponding step.
  • the communication device 12 may be divided into functional modules according to the foregoing method examples.
  • each functional module may be divided corresponding to each function, or two or more functions may be integrated into one processing module.
  • the above integrated modules can be implemented in the form of hardware or software functional modules.
  • the division of the modules in the embodiments of the present application is schematic, and is only a logical function division. In actual implementation, there may be another division manner.
  • FIG. 12 illustrates a possible structural diagram of the communication device 12.
  • the communication device 12 includes a transmitting unit 121, a processing unit 122, and a receiving unit 123.
  • the sending unit 121 is configured to support the communication device 12 to perform the sending operations shown in FIG. 8 to FIG.
  • processing unit 122 is used to support the communication device 12 to perform the processing operations shown in FIG. 8 to FIG.
  • the receiving unit 123 is used to support the communication device 12 to perform the receiving operations shown in FIG. 8 to FIG.
  • the communication device 12 provided in the embodiment of the present application includes, but is not limited to, the foregoing modules.
  • the communication device 12 may further include a storage unit 124.
  • the storage unit 124 may be configured to store a program code of the communication device 12.
  • the processing unit 122 may be the processor 61 in FIG. 6, the sending unit 121 and the receiving unit 123 may be the transceiver 64 in FIG. 6, and the storage unit 124 may be the memory 62 in FIG. 6. .
  • Another embodiment of the present application also provides a computer-readable storage medium.
  • the computer-readable storage medium stores instructions.
  • the communication device 12 executes as shown in FIG. 8 to FIG. 11.
  • the steps of the secondary station 1 in the communication method, or the steps of the secondary station 2 in the communication method of the embodiment shown in FIG. 8 to FIG. 11 are executed.
  • a computer program product includes computer-executable instructions stored in a computer-readable storage medium.
  • the processor of the communication device 12 may be obtained from a computer.
  • the storage medium reads the computer execution instruction, and the processor executes the computer execution instruction to cause the communication device 12 to execute the steps of the master station 1 in the communication method in the embodiment shown in FIG. 8 to FIG. 11, or execute the steps shown in FIG. 8 to FIG.
  • An embodiment of the present application provides a communication device 13.
  • the communication device 13 may be a terminal, or may be a part of the terminal device, such as a chip system in the terminal.
  • the chip system is configured to support a terminal to implement functions involved in the foregoing method embodiments, for example, to receive, send, or process data and / or information involved in the foregoing methods.
  • the chip system includes a chip, and may also include other discrete devices or circuit structures.
  • the communication device 13 is configured to perform steps performed by a terminal in the above communication method.
  • the communication device 13 provided in the embodiment of the present application may include a module corresponding to a corresponding step.
  • the communication device 13 may be divided into functional modules according to the foregoing method example.
  • each functional module may be divided corresponding to each function, or two or more functions may be integrated into one processing module.
  • the above integrated modules can be implemented in the form of hardware or software functional modules.
  • the division of the modules in the embodiments of the present application is schematic, and is only a logical function division. In actual implementation, there may be another division manner.
  • FIG. 13 shows a possible structural schematic diagram of the communication device 13 in this embodiment.
  • the communication device 13 includes a transmitting unit 131, a processing unit 132, and a receiving unit 133.
  • the sending unit 131 is configured to support the communication device 13 to perform the sending operations shown in FIG. 8 to FIG. 11, for example, S804, S901, S1001, S1101, S1106, and the like, and / or other processes for the technology described herein.
  • the processing unit 132 is configured to support the communication device 13 to perform the processing operations shown in FIG. 8 to FIG.
  • the receiving unit 133 is used to support the communication device 13 to perform the receiving operations shown in FIG. 8 to FIG. 11 above, for example: S800, S808, S911, S1009, S1012, S1105, S1112, etc., and / Or other processes for the techniques described herein.
  • the communication device 13 provided in the embodiment of the present application includes, but is not limited to, the foregoing modules.
  • the communication device 13 may further include a storage unit 134.
  • the storage unit 134 may be used to store program codes and data of the communication device 13.
  • the processing unit 132 may be the processor 701 in FIG. 7, the sending unit 131 and the receiving unit 133 may be antennas connected to the radio frequency circuit 702 in FIG. 7, and the storage unit 134 may be in FIG. 7. Memory 703.
  • Another embodiment of the present application further provides a computer-readable storage medium.
  • the computer-readable storage medium stores instructions. When the instructions are executed on the communication device 13, the communication device 13 executes as shown in FIG. 8 to FIG. The steps of the terminal in the communication method of the embodiment.
  • a computer program product includes computer-executable instructions stored in a computer-readable storage medium.
  • the processor of the communication device 13 may be obtained from a computer.
  • the storage medium reads the computer execution instruction, and the processor executes the computer execution instruction to cause the communication device 13 to execute the steps of the terminal in the communication method in the embodiment shown in FIG. 8 to FIG. 11.
  • all or part can be implemented by software, hardware, firmware, or any combination thereof.
  • a software program When implemented using a software program, it may appear in whole or in part in the form of a computer program product.
  • a computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, the processes or functions according to the embodiments of the present application are wholly or partially generated.
  • the computer may be a general purpose computer, a special purpose computer, a computer network, or other programmable device.
  • the computer instructions may be stored in or transmitted from one computer-readable storage medium to another computer-readable storage medium, for example, the computer instructions may be transmitted from a web site, computer, server, or data center via a wired (e.g., Coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (such as infrared, wireless, microwave, etc.) transmission to another website site, computer, server or data center.
  • the computer-readable storage medium may be any available medium that can be accessed by a computer or a data terminal device such as a server, a data center, or the like that includes one or more available mediums integrated.
  • the usable medium may be a magnetic medium (for example, a floppy disk, a hard disk, a magnetic tape), an optical medium (for example, a DVD), or a semiconductor medium (for example, a solid state disk (Solid State Disk (SSD)), and the like.
  • a magnetic medium for example, a floppy disk, a hard disk, a magnetic tape
  • an optical medium for example, a DVD
  • a semiconductor medium for example, a solid state disk (Solid State Disk (SSD)
  • the disclosed apparatus and method may be implemented in other ways.
  • the device embodiments described above are only schematic.
  • the division of the modules or units is only a logical function division.
  • multiple units or components may be divided.
  • the combination can either be integrated into another device, 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, which may be electrical, mechanical or other forms.
  • the unit described as a separate component may or may not be physically separated, and the component displayed as a unit may be a physical unit or multiple physical units, that is, may be located in one place, or may be distributed to multiple different places. . Some or all of the units may be selected according to actual needs to achieve the objective of the solution of this embodiment.
  • each functional unit in each embodiment of the present application may be integrated into one processing unit, or each of the units may exist separately physically, or two or more units may be integrated into one unit.
  • the above integrated unit may be implemented in the form of hardware or in the form of software functional unit.
  • the integrated unit When the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it may be stored in a readable storage medium.
  • the technical solutions of the embodiments of the present application essentially or partly contribute to the existing technology or all or part of the technical solutions may be embodied in the form of a software product, which is stored in a storage medium
  • the instructions include a number of instructions for causing a device (which can be a single-chip microcomputer, a chip, or the like) or a processor to execute all or part of the steps of the method described in each embodiment of the present application.
  • the foregoing storage media include: U disks, mobile hard disks, read-only memories (ROMs), random access memories (RAMs), magnetic disks or compact discs and other media that can store program codes .

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Abstract

本申请实施例公开一种通信方法、装置及系统，涉及通信技术领域，能够解决终端无法快速恢复与辅站的通信连接的问题。该方法包括：第一主站接收来自终端的第一消息，第一消息用于请求终端从第三态至连接态的切换；第一主站确定为终端提供服务的辅站；第一主站获取第一安全参数，第一安全参数用于终端与为终端提供服务的辅站通信所使用的安全密钥的衍生；第一主站获取SCG的配置信息，SCG的配置信息包括为终端提供服务的辅站为终端分配的随机接入资源、为终端提供服务的辅站中服务小区集合的信息和为终端提供服务的辅站的主小区的指示信息中的至少一个；第一主站向终端发送第二消息，第二消息包括第一安全参数和SCG的配置信息。

Description

一种通信方法、装置及系统
本申请要求于2018年05月30日提交国家知识产权局、申请号为201810542802.3、发明名称为“一种通信方法及装置”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本申请实施例涉及通信技术领域，尤其涉及一种通信方法、装置及系统。
背景技术
第五代通信技术(the 5 Generation Mobile Communication Technology，5G)系统中的用户设备(User Equipment，UE)，简称为5G UE，可处于无线资源控制(Radio Resource Control，RRC)空闲态(Idle mode)、RRC连接态(Connected mode)或者第三态。第三态也可称为非激活态(RRC Inactive mode)。在5G UE处于第三态的场景中，5G UE和接入网(Radio Access Network，RAN)设备均存储有该5G UE的AS上下文，核心网设备存储有该5G UE的上下文，核心网设备和RAN设备之间有该5G UE专用的信令连接(UE associated NG connection)。5G UE与RAN设备之间不存在RRC连接。对于第三态，由于核心网设备与RAN设备之间的5G UE专用连接没有释放，RAN设备存储了5G UE的AS上下文，可以加快5G UE恢复到连接态的速度，快速进行数据传输。
在5G系统中，存在由gNB(5G系统中使用新空口(New Radio，NR)的基站)与连接下一代核心网(The Next-Generation Core，NGC)的ng-eNB协同组网的异构通信系统。目前，在该异构通信系统中，当5G UE从第三态恢复到连接态时，主站为该5G UE配置一个新的辅站，即主站需要重新配置辅小区组(Secondary Cell Group，SCG)。但是，主站为终端重新配置辅站的流程速度较慢，导致5G UE恢复与辅站的通信连接速率较慢。
发明内容
本申请实施例提供一种通信方法、装置及系统，能够解决终端从第三态恢复到连接态时，与辅站的通信连接速率较慢的问题。
为达到上述目的，本申请实施例采用如下技术方案：
第一方面，提供一种通信方法，第一主站在接收到终端发送的用于请求终端从第三态至连接态的切换的第一消息后，确定为终端提供服务的辅站，并获取第一安全参数和SCG的配置信息，该第一安全参数用于终端与上述为终端提供服务的辅站通信所使用的安全密钥的衍生，该SCG的配置信息包括上述为终端提供服务的辅站为终端分配的随机接入资源、上述为终端提供服务的辅站中服务小区集合的信息和上述为终端提供服务的辅站的主小区的指示信息中的至少一个；然后，该第一主站向终端发送包括第一安全参数和SCG的配置信息的第二消息。
由于第一安全参数和SCG的配置信息属于终端与上述为终端提供服务的辅站通信所需的必要因素，第一主站向终端同时发送第一安全参数和SCG的配置信息后，终 端可直接根据该第一安全参数和SCG的配置信息完成与上述为终端提供服务的辅站之间的通信连接，有效的提高了在终端从第三态恢复到连接态时，配置SCG的速率，进一步提高了终端利用辅站的空口进行数据传输的效率。
可选的，在本申请的一种可能的实现方式中，上述“第一主站确定为终端提供服务的辅站”的方法为：第一主站接收终端发送的用于该第一主站确定为终端提供服务的辅站的第一信息，这样，该第一主站根据该第一信息，确定上述为终端提供服务的辅站。这里，第一信息包括至少一个测量小区中每个测量小区的信道质量；或者，第一信息用于指示为终端提供服务的辅站是第一辅站；或者，第一信息用于指示为终端提供服务的辅站是第一辅站，以及第一辅站中满足预设条件的小区；或者，第一信息用于指示为终端提供服务的辅站是第二辅站；或者，第一信息用于指示为终端提供服务的辅站不是第一辅站，以及第二辅站的标识；或者，第一信息用于指示为终端提供服务的辅站不是第一辅站，以及至少一个测量小区中每个测量小区的信道质量。本申请中的第一辅站为在终端切换到第三态之前，为终端提供服务的辅站。
可选的，在本申请的另一种可能的实现方式中，上述第一信息承载于第一消息中，该第一消息具体用于请求恢复终端的无线链路控制RRC连接或者用于请求更新终端的位置区域。上述第二消息用于恢复第一主站与终端之间的RRC连接。
可选的，本申请中的第一信息可以全部承载于第一消息中，也可以一部分承载于第一消息中，另一部分承载于消息7(该消息7为终端在接收到第二消息后向第一主站发送的消息)中，还可以全部承载于消息7中，本申请对此不作具体限定。消息7的描述具体可参见下文。
可选的，在本申请的另一种可能的实现方式中，在上述为终端提供服务的辅站为第一辅站，该第一辅站为在终端切换到第三态之前，为终端提供服务的辅站的情况下，上述“第一主站获取SCG的配置信息”的方法为：第一主站获取终端的上下文，该终端的上下文包括第一终端标识，第一终端标识为第一辅站在第一辅站与第二主站之间的接口为终端分配的标识，第二主站为在终端切换到第三态之前，为终端提供服务的主站；第一主站向第一辅站发送包括第一终端标识的第三消息，该第三消息用于请求第一辅站分配SCG的配置；第一主站接收来自第一辅站的SCG的配置信息。
由于第一辅站为在终端切换到第三态之前，为终端提供服务的辅站，因此，第一辅站根据第一终端标识即可确定出终端，并为该终端分配SCG的配置。
可选的，在本申请的另一种可能的实现方式中，在上述为终端提供服务的辅站为第二辅站的情况下，上述“第一主站获取SCG的配置信息”的方法为：第一主站获取终端的上下文，该终端的上下文包括第一配置信息，第一配置信息为第一辅站分配的辅小区组SCG的配置，第一辅站为在终端切换到第三态之前，为终端提供服务的辅站；第一主站向第二辅站发送包括第一配置信息的第三消息，第三消息用于请求第二辅站分配SCG的配置；第一主站接收来自第二辅站的SCG的配置信息。
在上述为终端提供服务的辅站为第二辅站的情况下，第一主站需要向第二辅站发送第一配置信息，以便于该第二辅站参考第一配置信息为终端分配SCG的配置。
可选的，在本申请的另一种可能的实现方式中，本申请提供的通信方法还包括：第一主站向第二主站发送第一指示信息，第一指示信息用于指示为终端提供服务的辅 站是第一辅站，或者，第一指示信息用于指示为终端提供服务的辅站不是第一辅站；第二主站为在终端切换到第三态之前，为终端提供服务的主站；第一辅站为在终端切换到第三态之前，为终端提供服务的辅站。
第一主站向第二主站发送第一指示信息，以便于第二主站根据第一指示信息完成与第一辅站的通信。此外，第二主站还可根据第一指示信息确定是否向第一主站发送第一终端标识。
第二方面，提供一种通信装置，该通信装置能够实现第一方面及其任意一种可能的实现方式中的功能。这些功能可以通过硬件实现，也可以通过硬件执行相应的软件实现。硬件或软件包括一个或多个与上述功能相对应的模块。
在本申请的一种可能的方式中，该通信装置可以包括接收单元、处理单元和发送单元，该接收单元、处理单元和发送单元可以执行上述第一方面及其任意一种可能的实现方式所述的通信方法中的相应功能，例如：接收单元，用于接收来自终端的第一消息，该第一消息用于请求终端从第三态至连接态的切换；处理单元，用于确定为终端提供服务的辅站，以及获取第一安全参数，该第一安全参数用于终端与为终端提供服务的辅站通信所使用的安全密钥的衍生，以及获取SCG的配置信息，该SCG的配置信息包括为终端提供服务的辅站为终端分配的随机接入资源、为终端提供服务的辅站中服务小区集合的信息和为终端提供服务的辅站的主小区的指示信息中的至少一个；发送单元，用于向终端发送第二消息，第二消息包括上述处理单元获取到的第一安全参数和SCG的配置信息。
第三方面，提供一种通信装置，该通信装置包括处理器，所述处理器用于与存储器耦合，读取并执行所述存储器中的指令，以实现上述第一方面及其任意一种可能的实现方式所述的通信方法。
可选的，该通信装置还可以包括存储器，该存储器用于保存该通信装置的程序指令和数据。进一步可选的，该通信装置还可以包括收发器，该收发器用于在所述通信装置的处理器的控制下，执行上述第一方面及其任意一种可能的实现方式所述的通信方法中收发数据、信令或信息的步骤，例如，接收第一消息、发送第二消息。
可选的，该通信装置可以是第一主站，也可以是第一主站中的一部分装置，例如第一主站中的芯片系统。该芯片系统用于支持第一主站实现第一方面及其任意一种可能的实现方式中所涉及的功能，例如，接收，发送或处理上述通信方法中所涉及的数据和/或信息。该芯片系统包括芯片，也可以包括其他分立器件或电路结构。
第四方面，还提供一种计算机可读存储介质，该计算机可读存储介质中存储有指令；当其在通信装置上运行时，使得通信装置执行如上述第一方面及其各种可能的实现方式所述的通信方法。
第五方面，还提供一种包括指令的计算机程序产品，当其在通信装置上运行时，使得通信装置执行如上述第一方面及其各种可能的实现方式所述的通信方法。
需要说明的是，上述指令可以全部或者部分存储在第一计算机存储介质上，其中，第一计算机存储介质可以与处理器封装在一起的，也可以与处理器单独封装，本申请对此不作具体限定。
本申请中第二方面、第三方面、第四方面、第五方面及其各种实现方式的具体描 述，可以参考第一方面及其各种实现方式中的详细描述；并且，第二方面、第三方面、第四方面、第五方面及其各种实现方式的有益效果，可以参考第一方面及其各种实现方式中的有益效果分析，此处不再赘述。
第六方面，提供一种通信方法，第二主站在确定终端的无线资源控制RRC状态从连接态切换为第三态后，向第一辅站发送挂起指示信息，该挂起指示信息用于第一辅站与终端之间的数据传输的挂起；相应的，该第二主站接收来自第一辅站的第一配置信息，并存储第一配置信息，第一配置信息包括第一辅站为终端分配的随机接入资源、用于指示辅小区组SCG承载的配置信息和SCG承载(或称为SN承载)的PDCP状态中的至少一个；后续，第二主站接收来自第一主站的上下文请求消息，该上下文请求消息用于请求获取终端的上下文，第一主站为第一小区所属的接入网设备，第一小区为终端的RRC状态为第三态、且终端请求恢复RRC连接所在的小区；响应于上下文请求消息，第二主站向第一主站发送终端的上下文，终端的上下文包括第一配置信息和用于指示终端的第一终端标识中的至少一个，第一终端标识为第一辅站在第一辅站与第二主站之间的接口为终端分配的标识。
可选的，在本申请的一种可能的实现方式中，本申请提供的通信方法还包括：第二主站确定为终端提供服务的辅站；在为终端提供服务的辅站不是第一辅站的情况下，第二主站向第一辅站发送删除释放指示信息，删除释放指示信息用于第一辅站中第一配置信息的删除，以及第一辅站与第二主站之间的接口上的终端的专用资源的释放；在为终端提供服务的辅站是第一辅站的情况下，第二主站向第一辅站发送保留释放指示信息，保留释放指示信息用于第一辅站中第一配置信息的保留，以及第一辅站与第二主站之间的接口上的终端的专用资源的释放。
终端从第三态恢复到连接态重新选取的主站为第一主站，因此，第二主站与第一辅站之间的终端的专用资源需要释放，以减少资源的浪费，提高资源的有效利用率。此外，第二主站根据为终端提供服务的辅站是否为第一辅站确定第一辅站是否需要继续保留第一配置信息。
可选的，在本申请的另一种可能的实现方式中，上述“第二主站确定为终端提供服务的辅站”的方法为：第二主站接收来自第一主站的第一指示信息，并根据第一指示信息，确定为终端提供服务的辅站，其中，第一指示信息用于指示为终端提供服务的辅站是第一辅站，或者，第一指示信息用于指示为终端提供服务的辅站不是第一辅站。
结合上述第一方面所述的通信方法可知，本申请中的第一主站确定出为终端提供服务的辅站，这样，第一主站可向第二主站发送第一指示信息，以便于第二主站确定后续与第一辅站的通信。
第七方面，提供一种通信装置，该通信装置能够实现第六方面及其任意一种可能的实现方式中的功能。这些功能可以通过硬件实现，也可以通过硬件执行相应的软件实现。硬件或软件包括一个或多个与上述功能相对应的模块。
在本申请的一种可能的方式中，该通信装置可以包括处理单元、接收单元和发送单元，该处理单元、接收单元和发送单元可以执行上述第六方面及其任意一种可能的实现方式所述的通信方法中的相应功能，例如：处理单元，用于确定终端的无线资源 控制RRC状态从连接态切换为第三态；接收单元，用于接收来自第一辅站的第一配置信息，并存储第一配置信息，第一配置信息包括第一辅站为终端分配的随机接入资源、用于指示辅小区组SCG承载的配置信息和SCG承载(或称为SN承载)的PDCP状态中的至少一个，以及用于接收来自第一主站的上下文请求消息，上下文请求消息用于请求获取终端的上下文，第一主站为第一小区所属的接入网设备，第一小区为终端的RRC状态为第三态、且终端请求恢复RRC连接所在的小区；发送单元，用于向第一辅站发送挂起指示信息，挂起指示信息用于第一辅站与终端之间的数据传输的挂起，以及用于向第一主站发送终端的上下文，终端的上下文包括第一配置信息和用于指示终端的第一终端标识中的至少一个，第一终端标识为第一辅站在第一辅站与第二主站之间的接口为终端分配的标识。
第八方面，提供一种通信装置，该通信装置包括处理器，所述处理器用于与存储器耦合，读取并执行所述存储器中的指令，以实现上述第六方面及其任意一种可能的实现方式所述的通信方法。
可选的，该通信装置还可以包括存储器，该存储器用于保存通信装置的程序指令和数据。进一步地，可选的，该通信装置还可以包括收发器，该收发器用于在所述通信装置的处理器的控制下，执行上述第六方面及其任意一种可能的实现方式所述的通信方法中收发数据、信令或信息的步骤，例如，发送挂起指示信息、接收第一配置信息、接收上下文请求消息。
可选的，该通信装置可以是第二主站，也可以是第二主站中的一部分装置，例如第二主站中的芯片系统。该芯片系统用于支持第二主站实现第六方面及其任意一种可能的实现方式中所涉及的功能，例如，接收，发送或处理上述通信方法中所涉及的数据和/或信息。该芯片系统包括芯片，也可以包括其他分立器件或电路结构。
第九方面，还提供一种计算机可读存储介质，该计算机可读存储介质中存储有指令；当其在通信装置上运行时，使得通信装置执行如上述第六方面及其各种可能的实现方式所述的通信方法。
第十方面，还提供一种包括指令的计算机程序产品，当其在通信装置上运行时，使得通信装置执行如上述第六方面及其各种可能的实现方式所述的通信方法。
需要说明的是，上述指令可以全部或者部分存储在第一计算机存储介质上，其中，第一计算机存储介质可以与处理器封装在一起的，也可以与处理器单独封装，本申请对此不作具体限定。
本申请中第七方面、第八方面、第九方面、第十方面及其各种实现方式的具体描述，可以参考第六方面及其各种实现方式中的详细描述；并且，第七方面、第八方面、第九方面、第十方面及其各种实现方式的有益效果，可以参考第六方面及其各种实现方式中的有益效果分析，此处不再赘述。
第十一方面，提供一种通信方法，第一辅站接收来自第二主站的挂起指示信息，该挂起指示信息用于第一辅站与终端之间的数据传输的挂起；第一辅站根据挂起指示信息，挂起第一辅站与终端之间的数据传输，并向第二主站发送包括第一配置信息的挂起响应消息，该挂起响应消息用于指示第一辅站与终端的数据传输已被挂起，第一配置信息包括第一辅站为终端分配的随机接入资源、用于指示辅小区组SCG承载的配 置信息和SCG承载(或称为SN承载)的PDCP状态的至少一个。
第一辅站在接收到挂起指示信息后，将第一辅站与终端之间的数据传输挂起，并未将第一辅站与终端之间的连接断开，也并未将第一辅站为终端分配的专用资源释放，这样，后续在终端从第三态恢复连接态时，如果为终端提供服务的辅站依旧为第一辅站，则终端可直接利用第一辅站与终端之间的连接进行通信，提高了终端利用辅站的空口进行数据传输的效率。
可选的，在本申请的一种可能的实现方式中，本申请提供的通信方法还包括：第一辅站接收来自第二主站的删除释放指示信息，该删除释放指示信息用于第一辅站中第一配置信息的删除，以及第一辅站与第二主站之间的接口上的终端的专用资源的释放；或者，第一辅站接收来自第二主站的保留释放指示信息，该保留释放指示信息用于第一辅站中第一配置信息的保留，以及第一辅站与第二主站之间的接口上的终端的专用资源的释放。
可选的，在本申请的另一种可能的实现方式中，在第一辅站接收来自第二主站的保留释放指示信息的情况下，本申请提供的通信方法还包括：第一辅站接收来自第一主站的包括第一终端标识的第一消息，根据该第一终端标识确定终端，并为该终端分配SCG的配置信息；进一步地，第一辅站向第一主站发送SCG的配置信息。这里，第一消息用于请求第一辅站的资源配置，第一主站为第一小区所属的接入网设备，第一小区为终端的RRC状态为第三态、且终端请求恢复RRC连接所在的小区，第一终端标识为第一辅站在第一辅站与第二主站之间的接口为终端分配的标识，SCG的配置信息包括第一辅站为终端分配的随机接入资源、第一辅站中服务小区集合的信息和第一辅站的主小区的指示信息中的至少一个。
第十二方面，提供一种通信装置，该通信装置能够实现第十一方面及其任意一种可能的实现方式中的功能。这些功能可以通过硬件实现，也可以通过硬件执行相应的软件实现。硬件或软件包括一个或多个与上述功能相对应的模块。
在本申请的一种可能的方式中，该通信装置可以包括处理单元、接收单元和发送单元，该处理单元、接收单元和发送单元可以执行上述第十一方面及其任意一种可能的实现方式所述的通信方法中的相应功能，例如：接收单元，用于接收来自第二主站的挂起指示信息，挂起指示信息用于第一辅站与终端之间的数据传输的挂起；处理单元，用于根据挂起指示信息，挂起第一辅站与终端之间的数据传输；发送单元，用于向第二主站发送包括第一配置信息的挂起响应消息，挂起响应消息用于指示第一辅站与终端的数据传输已被挂起，第一配置信息包括第一辅站为终端分配的随机接入资源、用于指示辅小区组SCG承载的配置信息和SCG承载(或称为SN承载)的PDCP状态的至少一个。
第十三方面，提供一种通信装置，该通信装置包括处理器，所述处理器用于与存储器耦合，读取并执行所述存储器中的指令，以实现上述第十一方面及其任意一种可能的实现方式所述的通信方法。
可选的，该通信装置还可以包括存储器，该存储器用于保存通信装置的程序指令和数据。进一步可选的，该通信装置还可以包括收发器，该收发器用于在所述通信装置的处理器的控制下，执行上述第十一方面及其任意一种可能的实现方式所述的通信 方法中收发数据、信令或信息的步骤，例如，接收挂起指示信息、发送挂起响应消息。
可选的，该通信装置可以是第一辅站，也可以是第一辅站中的一部分装置，例如第一辅站中的芯片系统。该芯片系统用于支持第一辅站实现第十一方面及其任意一种可能的实现方式中所涉及的功能，例如，接收，发送或处理上述通信方法中所涉及的数据和/或信息。该芯片系统包括芯片，也可以包括其他分立器件或电路结构。
第十四方面，还提供一种计算机可读存储介质，该计算机可读存储介质中存储有指令；当其在通信装置上运行时，使得通信装置执行如上述第十一方面及其各种可能的实现方式所述的通信方法。
第十五方面，还提供一种包括指令的计算机程序产品，当其在通信装置上运行时，使得通信装置执行如上述第十一方面及其各种可能的实现方式所述的通信方法。
需要说明的是，上述指令可以全部或者部分存储在第一计算机存储介质上，其中，第一计算机存储介质可以与处理器封装在一起的，也可以与处理器单独封装，本申请对此不作具体限定。
本申请中第十二方面、第十三方面、第十四方面、第十五方面及其各种实现方式的具体描述，可以参考第十一方面及其各种实现方式中的详细描述；并且，第十二方面、第十三方面、第十四方面、第十五方面及其各种实现方式的有益效果，可以参考第十一方面及其各种实现方式中的有益效果分析，此处不再赘述。
第十六方面，提供一种通信方法，终端向第一主站发送用于请求终端从第三态切换到连接态的第一消息，第一主站为第一小区所属的接入网设备，第一小区为终端的无线资源控制RRC状态为第三态、且终端请求恢复RRC连接所在的小区；对应的，该终端接收来自第一主站的包括第一安全参数和SCG的配置信息的第二消息，这样，该终端即可根据第一安全参数和SCG的配置信息，完成与为终端提供服务的辅站的通信连接。这里的第一安全参数用于终端与为终端提供服务的辅站通信所使用的安全密钥的衍生，SCG的配置信息包括为终端提供服务的辅站为终端分配的随机接入资源、为终端提供服务的辅站中服务小区集合的信息和为终端提供服务的辅站的主小区的指示信息中的至少一个。
由于第一安全参数和SCG的配置信息属于终端与上述为终端提供服务的辅站通信所需的必要因素，终端在同时接收到发送第一安全参数和SCG的配置信息后，终端可直接根据该第一安全参数和SCG的配置信息完成与上述为终端提供服务的辅站之间的通信连接，有效的提高了在终端从第三态恢复到连接态时，配置SCG的速率，进一步提高了终端利用辅站的空口进行数据传输的效率。
可选的，在本申请的一种可能的实现方式中，本申请提供的通信方法还包括：终端接收来自第二主站的状态切换指示信息，响应于状态切换指示信息，将终端的RRC状态切换为第三态，并存储与第一辅站对应的第一配置信息，其中，状态切换指示信息用于指示终端的RRC状态从连接态切换为第三态，第一配置信息包括辅小区组SCG承载的配置信息和SCG承载(或称为SN承载)的PDCP状态的至少一个。
与现有技术相比，本申请中的终端在接收到状态切换指示信息后，不再删除与第一辅站相关的配置信息，而是存储第一配置信息。这样，后续在终端从第三态恢复到连接态，若为该终端提供服务的辅站依旧为第一辅站，该终端即可参考该第一配置信 息恢复与第一辅站之间的连接，有效的提高了终端利用辅站空口进行数据传输的效率。
可选的，在本申请的另一种可能的实现方式中，上述第一消息包括第一信息，该第一信息用于第一主站确定为终端提供服务的辅站；其中，第一信息包括至少一个测量小区中每个测量小区的信道质量；或者，第一信息用于指示为终端提供服务的辅站是第一辅站；或者，第一信息用于指示为终端提供服务的辅站是第一辅站，以及第一辅站中满足预设条件的小区；或者，第一信息用于指示为终端提供服务的辅站是第二辅站；或者，第一信息用于指示为终端提供服务的辅站不是第一辅站，以及第二辅站的标识；或者，第一信息用于指示为终端提供服务的辅站不是第一辅站，以及至少一个测量小区中每个测量小区的信道质量；第一辅站为在终端切换到第三态之前，为终端提供服务的辅站。
第十七方面，提供一种通信装置，该通信装置能够实现第十六方面及其任意一种可能的实现方式中的功能。这些功能可以通过硬件实现，也可以通过硬件执行相应的软件实现。硬件或软件包括一个或多个与上述功能相对应的模块。
在本申请的一种可能的方式中，该通信装置可以包括处理单元、接收单元和发送单元，该处理单元、接收单元和发送单元可以执行上述第十六方面及其任意一种可能的实现方式所述的通信方法中的相应功能，例如：发送单元，用于向第一主站发送第一消息，第一消息用于请求终端从第三态切换到连接态，第一主站为第一小区所属的接入网设备，第一小区为终端的无线资源控制RRC状态为第三态、且终端请求恢复RRC连接所在的小区；处理单元，用于根据根据第一安全参数和SCG的配置信息，完成与为终端提供服务的辅站的通信连接；接收单元，用于接收来自第一主站的第二消息，第二消息包括第一安全参数和SCG的配置信息；第一安全参数用于终端与为终端提供服务的辅站通信所使用的安全密钥的衍生，SCG的配置信息包括为终端提供服务的辅站为终端分配的随机接入资源、为终端提供服务的辅站中服务小区集合的信息和为终端提供服务的辅站的主小区的指示信息中的至少一个。
第十八方面，提供一种通信装置，该通信装置包括处理器，所述处理器用于与存储器耦合，读取并执行所述存储器中的指令，以实现上述第十六方面及其任意一种可能的实现方式所述的通信方法。
可选的，该通信装置还可以包括存储器，该存储器用于保存通信装置的程序指令和数据。进一步可选的，该通信装置还包括收发器，用于在所述通信装置的处理器的控制下，执行上述第十六方面及其任意一种可能的实现方式所述的通信方法中收发数据、信令或信息的步骤，例如，发送第一消息、接收第二消息。
可选的，该通信装置可以是终端，也可以是终端中的一部分装置，例如终端中的芯片系统。该芯片系统用于支持终端实现第十六方面及其任意一种可能的实现方式中所涉及的功能，例如，接收，发送或处理上述通信方法中所涉及的数据和/或信息。该芯片系统包括芯片，也可以包括其他分立器件或电路结构。
第十九方面，还提供一种计算机可读存储介质，该计算机可读存储介质中存储有指令；当其在通信装置上运行时，使得通信装置执行如上述第十六方面及其各种可能的实现方式所述的通信方法。
第二十方面，还提供一种包括指令的计算机程序产品，当其在通信装置上运行时， 使得通信装置执行如上述第十六方面及其各种可能的实现方式所述的通信方法。
需要说明的是，上述指令可以全部或者部分存储在第一计算机存储介质上，其中，第一计算机存储介质可以与处理器封装在一起的，也可以与处理器单独封装，本申请对此不作具体限定。
本申请中第十七方面、第十八方面、第十九方面、第二十方面及其各种实现方式的具体描述，可以参考第十六方面及其各种实现方式中的详细描述；并且，第十七方面、第十八方面、第十九方面、第二十方面及其各种实现方式的有益效果，可以参考第十六方面及其各种实现方式中的有益效果分析，此处不再赘述。
第二十一方面，提供一种通信系统，该通信系统包括如第二方面至第五方面任一方面所述的通信装置、如第七方面至第十方面中任一方面所述的通信装置以及如第十二方面至第十五方面中任一方面所述的通信装置。
可选的，该通信系统还包括如上述权利要求十七方面至第二十方面中任一方面所述的通信装置。
在本申请中，上述通信装置的名字对设备或功能模块本身不构成限定，在实际实现中，这些设备或功能模块可以以其他名称出现。只要各个设备或功能模块的功能和本申请类似，属于本申请权利要求及其等同技术的范围之内。
本申请的这些方面或其他方面在以下的描述中会更加简明易懂。
附图说明
图1为传统的LTE系统的网络架构；
图2为4G系统与5G系统共存的网络结构示意图；
图3为ENDC场景的通信系统结构示意图；
图4为NEDC场景的通信系统结构示意图；
图5为NG-ENDC场景的通信系统结构示意图；
图6为本申请实施例提供的基站的硬件结构示意图；
图7为本申请实施例提供的手机的硬件结构示意图；
图8为本申请实施例提供的通信方法的流程示意图一；
图9为本申请实施例提供的通信方法的流程示意图二；
图10为本申请实施例提供的通信方法的流程示意图三；
图11为本申请实施例提供的通信方法的流程示意图四；
图12为本申请实施例提供的通信装置的流程示意图一；
图13为本申请实施例提供的通信装置的流程示意图二。
具体实施方式
在本申请实施例中，“示例性的”或者“例如”等词用于表示作例子、例证或说明。本申请实施例中被描述为“示例性的”或者“例如”的任何实施例或设计方案不应被解释为比其它实施例或设计方案更优选或更具优势。确切而言，使用“示例性的”或者“例如”等词旨在以具体方式呈现相关概念。
以下，术语“第一”、“第二”仅用于描述目的，而不能理解为指示或暗示相对重要性或者隐含指明所指示的技术特征的数量。由此，限定有“第一”、“第二”的特征可以明示或者隐含地包括一个或者更多个该特征。在本申请实施例的描述中，除非另有说 明，“多个”的含义是两个或两个以上。
本申请实施例将长期演进(Long Term Evolution，LTE)系统中的演进式基站(evolved Node Base Station，eNB)称为LTE eNB，将LTE系统中的UE称为LTE UE，将5G系统的UE称为5G UE。
在传统的LTE系统中，LTE eNB通过S1接口接入到分组核心演进(The Evolved Packet Core，EPC)网，不同的LTE eNB之间通过X2接口连接。每个LTE eNB均与至少一个LTE UE连接。图1示出了传统的LTE系统的网络架构。在实际应用中上述LTE eNB与LTE UE之间的连接为无线连接，为了方便直观地表示各个设备之间的连接关系，图1中采用实线示意。
随着通信技术的发展，LTE eNB可演进为下一代LTE基站(Next Generation eNB，ng-eNB)。ng-eNB通过演进通用陆地无线接入(Evolved Universal Terrestrial Radio Access，E-UTRA)技术为UE提供无线传输资源。ng-eNB可以为UE提供第五代核心网(the 5th Generation Core Network，5GCN)的服务，也可以为UE提供EPC的服务。在实际部署中，ng-eNB可以仅仅与5GCN/EPC连接，也可以同时与5GCN和EPC连接。5GCN也可以称为5GC。
5G系统的接入网(Radio Access Network，RAN)称为下一代RAN(Next Generation RAN，NG-RAN)，NG-RAN节点包括ng-eNB和gNB(5G系统中的基站)。其中，gNB通过新空口(New Radio，NR)技术为5G UE提供无线传输资源，并为5G UE提供5GC的服务。
图2示出了4G系统与5G系统共存的网络结构。如图2所示，ng-eNB可通过S1接口接入到EPC，也可通过其他相应接口(图2中用NG表示)接入到5GC。与ng-eNB连接的5G UE可通过ng-eNB接入到5GC。与ng-eNB连接的LTE UE，可通过ng-eNB接入EPC。LTE eNB与连接了EPC的ng-eNB之间通过X2接口连接，ng-eNB与gNB之间通过Xn接口连接。同理，在实际应用中上述多个设备与UE之间的连接可能为无线连接，为了方便直观地表示各个设备之间的连接关系，图2中采用实线示意。
在LTE系统中，LTE UE可处于RRC空闲态(RRC Idle mode)或RRC连接态(RRC Connected mode)。在LTE UE处于RRC空闲态的场景中，该LTE UE删除接入层(Access Stratum，AS)上下文，核心网设备保留该LTE UE的上下文，RAN设备没有该LTE UE的上下文，核心网设备与RAN设备之间也没有LTE UE专用的信令连接(UE associated S1connection)。当有LTE UE的下行数据到达时，核心网设备会在LTE UE的跟踪区(Tracking Area，TA)发起该LTE UE的寻呼(Paging)，其中，跟踪区也可以称为寻呼区。LTE UE通过监听寻呼信道获知是否需要转换到RRC连接态进行下行数据接收。当LTE UE需要发送上行数据时，该LTE UE也会主动转换到RRC连接态，以完成上行数据的发送。当处于RRC空闲态的LTE UE跨TA时，需要进行位置区域更新(Tracking Area Update，TAU)。在LTE UE处于RRC连接态的场景中，核心网设备和RAN设备均有该LTE UE的上下文，该LTE UE与RAN设备之间维持RRC连接，LTE UE可以进行数据的上下行传输。
与LTE UE类似，5G UE也可处于RRC空闲态和RRC连接态。除了RRC空闲态和RRC连接态，5G UE还可以处于第三态，其中，第三态也可称为非激活态(RRC  INACTIVE mode或RRC_INACTIVE state)。在5G UE处于第三态的场景中，5G UE和RAN设备均存储该5G UE的AS上下文，核心网设备存储有该5G UE的上下文，核心网设备和RAN设备之间有该5G UE专用的信令连接(UE associated NG connection)，5G UE与RAN设备之间的RRC连接被挂起(suspended)。当有5G UE的下行数据到达时，RAN设备可以发起寻呼，寻呼区域可以为空闲态的TA，也可为RAN寻呼区(RAN-based notification area，RNA)，还可以为一个小区列表。当处于第三态的5G UE跨寻呼区域时，需要进行位置更新，例如TAU或RNAU(RAN-based Notification Area Update，RNAU)。可以看出，对于核心网设备而言，处于第三态的5G UE与处于连接态的5G UE类似。对于RAN设备而言，处于第三态的5G UE与处于空闲态的5G UE类似，没有实时的RRC连接和数据发送，需要通过寻呼为5G UE发送下行数据。当5G UE有上行数据到达时，UE需要向RAN设备发送请求以恢复RRC连接，进而发送上行数据。
对于第三态，由于核心网设备与RAN设备之间的5G UE专用连接没有释放，RAN设备储存了5G UE的AS上下文，可以加快5G UE恢复到连接态的速度，快速进行数据传输。
5G系统中存在多个无线接入技术的双连接(Multiple RATs Dual Connectivity，MR-DC)的异构通信系统。该异构通信系统包括ENDC(E-UTRA NR DC)、NEDC(NR E-UTRA DC)以及NG-ENDC(Next Generation E-UTRA NR DC)。在这三种异构通信系统中，LTE基站(LTE eNB/eLTE eNB)与NR基站(称为gNB)进行双连接。其中，eLTE eNB是指能够与NGC连接的LTE eNB。其中，NGC又称为第五代核心网(The 5th Generation Core，5GC)，eLTE eNB又称为ng-eNB。
ENDC也称为Option 3/3A/3X。ENDC通信系统中，LTE eNB为主站(Master Node，MN)，gNB为辅站(Secondary Node，SN)，MN与EPC连接，MN与SN为终端与EPC之间的数据提供空口传输资源。
如图3所示，图3中的(a)为Option 3通信系统的结构示意图，图3中的(b)为Option 3A通信系统的结构示意图。Option 3通信系统中，LTE eNB通过S1接口(包括S1-C接口和S1-U接口)与EPC连接，LTE eNB与gNB通过X2接口连接。与Option3通信系统不同的是，Option 3A通信系统中，gNB还通过S1-U接口与EPC连接。为了便于区分，图3中用虚线表示控制面的连接。
NEDC也称为Option 4/4A。在NEDC通信系统中，gNB为MN，eLTE eNB为SN，并且MN与NGC连接，MN与SN为终端与NGC之间的数据提供空口传输资源。
如图4所示，图4中的(a)为Option 4通信系统的结构示意图，图4中的(b)为Option 4A通信系统的结构示意图。Option 4通信系统中，gNB通过NG接口(包括NG-C接口和NG-U接口)与NGC连接，eLTE eNB与gNB通过Xn接口连接。与Option 4通信系统不同的是，Option 4A通信系统中，eLTE eNB还通过NG-U接口与NGC连接。为了便于区分，图4中用虚线表示控制面的连接。
NG-ENDC也称为Option 7/7A/7X。在NG-ENDC通信系统中，eLTE eNB为MN，gNB为SN，并且MN与NGC连接。与上述ENDC通信系统不同的是，NG-ENDC通信系统中，MN与SN为终端与NGC之间的数据提供空口传输资源。
如图5所示，图5中的(a)为Option 7通信系统的结构示意图，图5中的(b)为Option 7A通信系统的结构示意图。Option 7通信系统中，eLTE eNB通过NG接口(包括NG-C接口和NG-U接口)与NGC连接，eLTE eNB与gNB通过Xn接口连接。与Option 7通信系统不同的是，Option 7A通信系统中，gNB还通过NG-U接口与NGC连接。为了便于区分，图5中用虚线表示控制面的连接。
可以看出，上述NE-DC通信系统和NG EN-DC通信系统中的基站均属于NG-RAN节点，且与5GC相连，因此，NE-DC通信系统和NG EN-DC通信系统中的终端能够支持第三态。目前，在NE-DC通信系统和NG EN-DC通信系统中，当终端从连接态进入第三态后，该终端删除自身存储的辅站的相关配置，即删除SCG的配置，此外，主站释放辅站。当该终端从第三态恢复到连接态时，当前为该终端提供服务的主站需要为该终端重新配置辅站，但是，当前为该终端提供服务的主站为终端重新配置辅站的流程速度较慢，不利于终端快速利用辅站的空口进行数据传输。
针对上述问题，本申请实施例提供一种通信方法，第一主站在接收到终端发送的用于请求终端从第三态恢复(resume)为连接态的第一消息后，确定为终端提供服务的辅站，并获取第一安全参数和SCG的配置信息，然后，该第一主站向终端发送包括第一安全参数和SCG的配置信息的第二消息。这里，第一安全参数用于衍生终端与所述为终端提供服务的辅站通信所使用的安全密钥，SCG的配置信息包括所述为终端提供服务的辅站为终端分配的随机接入资源、所述为终端提供服务的辅站中服务小区集合的信息和所述为终端提供服务的辅站的主小区的指示信息中的至少一个。由于第一安全参数和SCG的配置信息属于终端与所述为终端提供服务的辅站通信所需的必要因素，第一主站向终端同时发送第一安全参数和SCG的配置信息后，终端可直接根据该第一安全参数和SCG的配置信息完成与所述为终端提供服务的辅站之间的通信连接，有效的提高了在终端从第三态恢复到连接态时，配置SCG的速率，进一步提高了终端利用辅站的空口进行数据传输的效率。
本申请实施例提供的通信方法适用于上述图4或图5示出的异构通信系统，也适用于支持相同制式多连接的5G系统，例如gNB与gNB之间的DC，或者eLTE eNB与eLTE eNB之间的DC，用于为UE提供与5GC之间的数据传输。
本申请实施例涉及到的主站可以为上述gNB，也可以为上述eLTE eNB，本申请实施例对此不作具体限定。同理，本申请实施例涉及到的辅站均可以为上述gNB，也可以为上述eLTE eNB，本申请实施例对此不作具体限定。
示例性的，若本申请实施例适用于图4示出的异构通信系统，为终端提供服务的主站为gNB，为终端提供服务的辅站为eLTE eNB。这里的主站可以为终端从连接态切换(transit)为第三态之前为终端提供服务的主站，也可以为终端从第三态恢复到连接态后为终端提供服务的主站。同理，这里的辅站可以为终端从连接态切换为第三态之前为终端提供服务的辅站，也可以为终端从第三态恢复到连接态后为终端提供服务的辅站。
为了便于说明，本申请实施例主要以图4或图5示出的异构通信系统为例进行说明。结合上述图4或图5，上述eLTE eNB和gNB均为基站，图6示出了本申请实施例中基站(eLTE eNB/gNB)的组成结构。
如图6所示，基站可以包括处理器61、存储器62以及总线63。
下面结合图6对基站的各个构成部件进行具体的介绍：
处理器61是基站的控制中心，可以是一个处理器，也可以是多个处理元件的统称。例如，处理器61是一个CPU，也可以是特定集成电路(Application Specific Integrated Circuit，ASIC)，或者是被配置成实施本申请实施例的一个或多个集成电路，例如：一个或多个微处理器(Digital Signal Processor，DSP)，或，一个或者多个现场可编程门阵列(Field Programmable Gate Array，FPGA)。
其中，处理器61可以通过运行或执行存储在存储器62内的软件程序，以及调用存储在存储器62内的数据，执行基站的各种功能。
在具体的实现中，作为一种实施例，处理器61可以包括一个或多个CPU，例如图中所示的CPU 0和CPU 1。处理器61可以是一个单核处理器(single-CPU)，也可以是一个多核处理器(multi-CPU)。这里的处理器可以指一个或多个设备、电路、和/或用于处理数据(例如计算机程序指令)的处理核。
存储器62可以是只读存储器(Read-Only Memory，ROM)或可存储静态信息和指令的其他类型的静态存储设备，随机存取存储器(Random Access Memory，RAM)或者可存储信息和指令的其他类型的动态存储设备，也可以是电可擦可编程只读存储器(Electrically Erasable Programmable Read-Only Memory，EEPROM)、只读光盘(Compact Disc Read-Only Memory，CD-ROM)或其他光盘存储、光碟存储(包括压缩光碟、激光碟、光碟、数字通用光碟、蓝光光碟等)、磁盘存储介质或者其他磁存储设备、或者能够用于携带或存储具有指令或数据结构形式的期望的程序代码并能够由计算机存取的任何其他介质，但不限于此。存储器62可以是独立存在，通过总线63与处理器61相连接。存储器62也可以和处理器61集成在一起。
其中，存储器62用于存储执行本申请方案的软件程序，并由处理器61来控制执行。
总线63，可以是工业标准体系结构(Industry Standard Architecture，ISA)总线、外部设备互连(Peripheral Component Interconnect，PCI)总线或扩展工业标准体系结构(Extended Industry Standard Architecture，EISA)总线等。该总线可以分为地址总线、数据总线、控制总线等。为便于表示，图6中仅用一条粗线表示，但并不表示仅有一根总线或一种类型的总线。
可选的，基站还包括收发器64。收发器64用于在处理器61的控制下与其他设备或通信网络通信。如用于与以太网，无线接入网(radio access network，RAN)，无线局域网(Wireless Local Area Networks，WLAN)等通信网络通信。收发器64可以包括基带处理器的全部或部分，以及还可选择性地包括射频(Radio Frequency，RF)处理器。RF处理器用于收发RF信号，基带处理器则用于实现由RF信号转换的基带信号或即将转换为RF信号的基带信号的处理。
由于收发器64为可选的，因此，图6中用虚线表示。
图6中示出的设备结构并不构成对基站的限定，可以包括比图示更多或更少的部件，或者组合某些部件，或者不同的部件布置。
本申请实施例中的终端可以是指能够与eLTE eNB/gNB在控制面和用户面实现数 据传输的手机(如图7所示的手机700)、平板电脑、个人计算机(Personal Computer，PC)、个人数字助理(Personal Digital Assistant，PDA)、智能手表、上网本、可穿戴电子设备等，本申请实施例对该设备的具体形式不做特殊限制。
如图7所示，以手机700作为上述终端举例，手机700具体可以包括：处理器701、RF电路702、存储器703、外设接口704以及电源装置705。可选的，手机700还可以包括触摸屏706、蓝牙装置707、一个或多个传感器708、无线保真(Wireless Fidelity，Wi-Fi)装置709、定位装置710以及音频电路711等部件。这些部件可通过一根或多根通信总线或信号线(图7中未示出)进行通信。
由于上述触摸屏706、蓝牙装置707、一个或多个传感器708、无线保真(Wireless Fidelity，Wi-Fi)装置709、定位装置710以及音频电路711为可选的部件，图7中用虚线框表示。
下面结合图7对手机700的各个部件进行具体的介绍：
处理器701是手机700的控制中心，利用各种接口和线路连接手机700的各个部分，通过运行或执行存储在存储器703内的应用程序，以及调用存储在存储器703内的数据，执行手机700的各种功能和处理数据。在一些实施例中，处理器701可包括一个或多个处理单元。在本申请实施例一些实施例中，上述处理器701还可以包括指纹验证芯片，用于对采集到的指纹进行验证。
射频电路702可用于在收发信息或通话过程中，无线信号的接收和发送。特别地，射频电路702可以将基站的下行数据接收后，给处理器701处理；另外，将涉及上行的数据发送至基站。通常，射频电路包括但不限于天线、至少一个放大器、收发信机、耦合器、低噪声放大器、双工器等。此外，射频电路702还可以通过无线通信和其他设备通信。所述无线通信可以使用任一通信标准或协议，包括但不限于全球移动通讯系统、通用分组无线服务、码分多址、宽带码分多址、长期演进、电子邮件、短消息服务等。
存储器703用于存储应用程序以及数据，处理器701通过运行存储在存储器703的应用程序以及数据，执行手机700的各种功能以及数据处理。存储器703主要包括存储程序区以及存储数据区，其中，存储程序区可存储操作系统、至少一个功能所需的应用程序(比如声音播放功能、图像处理功能等)；存储数据区可以存储根据使用手机700时所创建的数据(比如音频数据、电话本等)。此外，存储器703可以包括高速随机存取存储器(RAM)，还可以包括非易失存储器，例如磁盘存储器件、闪存器件或其他易失性固态存储器件等。存储器703可以存储各种操作系统，例如，iOS操作系统，Android操作系统等。上述存储器703可以是独立的，通过上述通信总线与处理器701相连接；存储器703也可以和处理器701集成在一起。
外设接口704，用于为外部的输入/输出设备(例如键盘、鼠标、外接显示器、外部存储器、用户识别模块卡等)提供各种接口。例如通过通用串行总线(Universal Serial Bus，USB)接口与鼠标连接，通过用户识别模块卡卡槽上的金属触点与电信运营商提供的用户识别模块卡(Subscriber Identification Module，SIM)卡进行连接。外设接口704可以被用来将外部的输入/输出外围设备耦接到处理器701和存储器703。
电源装置705用于给手机700中的各个部件供电。该电源装置705可以为电池和 电源管理芯片，电池可以通过电源管理芯片与处理器701逻辑相连，从而通过电源装置705实现管理充电、放电、以及功耗管理等功能。
触摸屏706具体可以包括触控板706-1和显示器706-2。
其中，触控板706-1可采集手机700的用户在其上或附近的触摸事件(比如用户使用手指、触控笔等任何适合的物体在触控板706-1上或在触控板706-1附近的操作)，并将采集到的触摸信息发送至其他器件(例如处理器701)。其中，用户在触控板706-1附近的触摸事件可以称之为悬浮触控；悬浮触控可以是指，用户无需为了选择、移动或拖动目标(例如图标等)而直接接触触控板，而只需用户位于设备附近以便执行所想要的功能。此外，可以采用电阻式、电容式、红外线以及表面声波等多种类型来实现触控板706-1。
显示器(也称为显示屏)706-2可用于显示由用户输入的信息或提供给用户的信息以及手机700的各种菜单。可以采用液晶显示器、有机发光二极管等形式来配置显示器706-2。触控板706-1可以覆盖在显示器706-2之上，当触控板706-1检测到在其上或附近的触摸事件后，传送给处理器701以确定触摸事件的类型，随后处理器701可以根据触摸事件的类型在显示器706-2上提供相应的视觉输出。虽然在图7中，触控板706-1与显示器706-2是作为两个独立的部件来实现手机700的输入和输出功能，但是在某些实施例中，可以将触控板706-1与显示器706-2集成而实现手机700的输入和输出功能。可以理解的是，触摸屏706是由多层的材料堆叠而成，本申请实施例实施例中只展示出了触控板(层)和显示器(层)，其他层在本申请实施例实施例中不予记载。另外，触控板706-1可以以全面板的形式配置在手机700的正面，显示器706-2也可以以全面板的形式配置在手机700的正面，这样在手机的正面就能够实现无边框的结构。
可选的，手机700还可以具有指纹识别功能。例如，可以在手机700的背面(例如后置摄像头的下方)配置指纹采集器件712，或者在手机700的正面(例如触摸屏706的下方)配置指纹采集器件712。又例如，可以在触摸屏706中配置指纹采集器件712来实现指纹识别功能，即指纹采集器件712可以与触摸屏706集成在一起来实现手机700的指纹识别功能。在这种情况下，该指纹采集器件712配置在触摸屏706中，可以是触摸屏706的一部分，也可以以其他方式配置在触摸屏706中。本申请实施例实施例中的指纹采集器件712的主要部件是指纹传感器，该指纹传感器可以采用任何类型的感测技术，包括但不限于光学式、电容式、压电式或超声波传感技术等。
蓝牙装置707，用于实现手机700与其他短距离的设备(例如手机、智能手表等)之间的数据交换。本申请实施例实施例中的蓝牙装置可以是集成电路或者蓝牙芯片等。
手机700还可以包括至少一种传感器708，比如光传感器、运动传感器以及其他传感器。具体的，光传感器可包括环境光传感器及接近传感器，其中，环境光传感器可根据环境光线的明暗来调节触摸屏706的显示器的亮度，接近传感器可在手机700移动到耳边时，关闭显示器的电源。作为运动传感器的一种，加速计传感器可检测各个方向上(一般为三轴)加速度的大小，静止时可检测出重力的大小及方向，可用于识别手机姿态的应用(比如横竖屏切换、相关游戏、磁力计姿态校准)、振动识别相关功能(比如计步器、敲击)等；至于手机700还可配置的陀螺仪、气压计、湿度计、 温度计、红外线传感器等其他传感器，在此不再赘述。
Wi-Fi装置709，用于为手机700提供遵循Wi-Fi相关标准协议的网络接入，手机700可以通过Wi-Fi装置709接入到Wi-Fi接入点，进而帮助用户收发电子邮件、浏览网页和访问流媒体等，它为用户提供了无线的宽带互联网访问。在其他一些实施例中，该Wi-Fi装置709也可以作为Wi-Fi无线接入点，可以为其他设备提供Wi-Fi网络接入。
定位装置710，用于为手机700提供地理位置。可以理解的是，该定位装置710具体可以是全球定位系统(Global Positioning System，GPS)或北斗卫星导航系统、俄罗斯GLONASS等定位系统的接收器。定位装置710在接收到上述定位系统发送的地理位置后，将该信息发送至处理器701进行处理，或者发送至存储器703进行保存。在另外的一些实施例中，该定位装置710还可以是辅助全球卫星定位系统(Assisted Global Positioning System，AGPS)的接收器，AGPS系统通过作为辅助服务器来协助定位装置710完成测距和定位服务，在这种情况下，辅助定位服务器通过无线通信网络与设备例如手机700的定位装置710(即GPS接收器)通信而提供定位协助。在另外的一些实施例中，该定位装置710也可以是基于Wi-Fi接入点的定位技术。由于每一个Wi-Fi接入点都有一个全球唯一的MAC地址，设备在开启Wi-Fi的情况下即可扫描并收集周围的Wi-Fi接入点的广播信号，因此可以获取到Wi-Fi接入点广播出来的MAC地址；设备将这些能够标示Wi-Fi接入点的数据(例如MAC地址)通过无线通信网络发送至位置服务器，由位置服务器检索出每一个Wi-Fi接入点的地理位置，并结合Wi-Fi广播信号的强弱程度，计算出该设备的地理位置并发送到该设备的定位装置710中。
音频电路711、扬声器713、麦克风714可提供用户与手机700之间的音频接口。音频电路711可将接收到的音频数据转换后的电信号，传输到扬声器713，由扬声器713转换为声音信号输出；另一方面，麦克风714将收集的声音信号转换为电信号，由音频电路711接收后转换为音频数据，再将音频数据输出至RF电路702以发送至比如另一手机，或者将音频数据输出至存储器703以便进一步处理。
尽管图7未示出，手机700还可以包括摄像头(前置摄像头和/或后置摄像头)、闪光灯、微型投影装置、近场通信(Near Field Communication，NFC)装置等，在此不再赘述。
本领域技术人员可以理解，图7中示出的硬件结构并不构成对手机的限定，手机700可以包括比图示更多或更少的部件，或者组合某些部件，或者不同的部件布置。
下面将详细介绍本申请提供的通信方法。
从上面描述可知，在5G通信系统中，终端的RRC状态可以从连接态切换到第三态，后续，终端的RRC状态可以从第三态恢复到连接态。为了便于描述，本申请实施例采用主站1表示在终端从连接态切换到第三态之前为该终端提供服务的主站，即主站1表示第二主站；采用主站2表示在终端从第三态恢复到连接态后为终端提供服务的主站，即主站2表示第一主站；采用辅站1表示在终端从连接态切换到第三态之前为该终端提供服务的辅站，即辅站1表示第一辅站；采用辅站2表示在终端从第三态恢复到连接态后为终端提供服务的辅站，即辅站2表示第二辅站。
图8为本申请实施例提供的一种通信方法的流程示意图。如图8所示，本申请实施例提供的通信方法中，S800由主站1中的处理器执行，S801、S804以及S809由终端中的处理器执行，S802和S803由辅站1中的处理器执行，S805、S806、S807以及S808由主站2中的处理器执行。
参见图8，该通信方法包括如下步骤。
S800、主站1确定将终端的RRC状态从连接态切换为第三态后，向终端发送状态切换指示信息，并向辅站1发送挂起指示信息。
主站1与终端之间存在RRC连接，且主站1为终端配置了DC操作，例如：主站1选取辅站1作为该终端的辅站。
终端通过主站1的空口资源和辅站1的空口资源进行数据传输。终端与主站1的通信数据，例如：数据无线承载(Data Radio Bearer，DRB)的数据或信令无线承载(Signalling Radio Bearer，SRB)的信令，基于初始MN安全秘钥进行安全保护。终端与辅站1的通信数据基于初始SN安全秘钥进行安全保护。
这里的安全保护可以指加解密、完整性保护和完整性校验。加密/解密需要根据加密秘钥和加密算法进行。完整性保护/完整性校验需要根据完整性保护秘钥和完整性保护算法进行。一般的，加密秘钥是基于基础秘钥和加密算法衍生(derive)得到的，完整性保护秘钥是基于所述基础秘钥和完整性保护算法衍生得到的。其中，加密算法与完整性保护算法可以相同，也可以不同。可选的，加密算法和完整性保护算法均可以由分组数据汇聚协议(Packet Data Convergence Protocol，PDCP)实体所归属的基站配置。例如：主站1配置MN承载使用的加密算法和完整性保护算法，辅站1配置SN承载使用的加密算法和完整性保护算法。示例性的，基础秘钥可以为KeNB或KgNB。
UE在配置了DC操作时可以建立两类无线承载。其中，第一类为分组数据汇聚协议(Packet Data Convergence Protocol，PDCP)终结在MN上的承载(MN terminated bearer)，简称为MN承载，这种承载基站侧的PDCP部署在MN上，由MN的PDCP进行安全相关的处理；第二类为PDCP终结在SN上的承载(SN terminated bearer)，简称SN承载，这种承载基站侧的PDCP部署在SN上，由SN的PDCP进行安全相关的处理。上述MN承载和SN承载的PDCP协议数据单元(Protocol Data Unit，PDU)均可以通过MN空口资源和/或SN空口资源发送。当仅通过MN空口资源发送时，称为主小区组(Master Cell Group，MCG)承载；当仅通过SN空口资源发送时，称为辅小区组(Secondary Cell Group，SCG)承载；当同时使用MN空口资源和SN空口资源发送时，称为分裂(split)承载，此时，若为MN承载，则为MCG split承载，若为SN承载，则为SCG split承载。
本申请实施例将加密和完整性保护使用的秘钥统称为安全秘钥，将加密算法和完整性保护算法统称为安全算法。也就是说，安全秘钥包括加密秘钥和/或完整性保护秘钥，安全算法包括加密算法和/或完整性保护算法。
示例性的，加密秘钥包括用于RRC信令的加密秘钥和/或用于数据的加密秘钥；完整性保护秘钥包括用于RRC信令的完整性保护秘钥和/或用于数据的完整性保护秘钥；加密算法包括用于RRC信令的加密算法和/或用于数据的加密算法；完整性保护算法包括用于RRC信令的完整性保护算法和/或用于数据的完整性保护算法。
在终端通过主站1的空口资源和辅站1的空口资源进行数据传输的场景中，终端的安全上下文包括：初始MN基础秘钥、初始SN基础秘钥、初始MN安全秘钥(用于MN链路安全保护的秘钥)、初始MN安全算法(用于MN链路安全保护的算法)、初始SN安全秘钥(用于SN链路安全保护的秘钥)、初始SN安全算法(用于SN链路安全保护的算法)、下一跳参数(Next Hop parameter，NH)、下一跳链计数参数(Next Hop Chaining Counter parameter，NCC)以及SN安全参数中的至少一个。其中，SN安全参数用于基于初始MN基础秘钥获得初始SN基础秘钥。例如，SN安全参数为Sk counter。
在主站1确定将终端的RRC状态从连接态切换为第三态后，该主站1向终端发送状态切换指示信息，该状态切换指示信息用于指示终端的RRC状态从连接态切换为第三态。
具体的，状态切换指示信息可以承载于消息1中。示例性的，该消息1可以为RRC连接释放(RRC Connection Release或RRC Release)消息。
可选的，该状态切换指示信息可以通过直接(或称为显式)或间接(或称为隐式)的方式体现，本申请实施例对此不作具体限定。
示例性的，若状态切换指示信息通过直接的方式体现，该状态切换指示信息可以为RRC Inactive命令。若状态切换指示信息通过间接的方式体现，该状态切换指示信息可以为终端标识1，该终端标识1为在某一接入网区域内终端处于第三态的专用标识，例如非激活无线网络临时标识(Inactive Radio Network Tempory Identity，I-RNTI)或Resume ID。该接入网区域可以由一个或多个小区组成，或者由一个或多个跟踪区(Tracking area，TA)组成，或者由一个或多个RAN区域(RAN-Area)组成。其中，一个跟踪区由一个TA标识(TA Code，TAC)表征；一个RAN区域由一个RAN区域标识(RAN-Area Code)表征，RAN区域标识仅在一个TA内唯一。
可选的，消息1还可以包括第二安全参数。该第二安全参数用于终端基于当前的初始MN基础秘钥衍生用于下一次与基站通信的基础秘钥。例如，第二安全参数为下一跳链计数参数(Next Hop Chaining Counter parameter，NCC)。可选的，终端将第二安全参数存储于终端的安全上下文中。
在主站1确定将终端的RRC状态从连接态切换为第三态后，该主站1通过基站间接口(如Xn接口)向辅站1发送挂起指示信息，该挂起指示信息用于辅站1与终端之间的数据传输的挂起。
可选的，该挂起指示信息可以通过直接(或称为显式)或间接(或称为隐式)的方式体现，本申请实施例对此不作具体限定。示例性的，该挂起指示信息可以承载于Xn接口的辅站修改(SN Modification)消息或辅站释放(SN Release)消息中。
需要说明的是，主站1可以先向终端发送状态切换指示信息，后向辅站1发送挂起指示信息，也可以先向辅站1发送挂起指示信息，后向终端发送状态切换指示信息，还可以在向终端发送状态切换指示信息的同时向辅站1发送挂起指示信息，本申请实施例对此不作具体限定。
可选的，主站1在向终端发送状态切换之前需要确定没有终端的下行数据待传输。对于主站侧的数据传输(包括MN承载和SN承载通过主站的空口传输的数据)，主 站1可以自行确定，但是主站1不能实时确定辅站1是否有待传输的终端的下行数据，尤其对于SN承载，下行数据直接由核心网发送给辅站1，主站1不能感知到其数据传输情况。本申请实施例还提供用于主站1确定是否可以将终端的RRC状态从连接态切换为第三态的方法，该方法可以作为独立的方法单独使用，也可以与本实施例的其他步骤组合使用。该方法具体包括：主站1在向终端发送状态切换指示信息之前，向辅站1发送挂起需求指示，用于询问辅站1是否可以将终端从连接态切换为第三态；若辅站1允许将终端从连接态切换为第三态(可选的，在一个预设时间段内辅站1处无该终端的上下行数据，则辅站1允许将终端切换为第三态)，辅站1向主站1发送挂起确认指示，用于指示辅站同意将终端从连接态切换为第三态；反之，若辅站1不允许将终端切换为第三态，则向主站1发送挂起拒绝指示。可选的，挂起拒绝指示可以包括表示还有终端下行数据传输和/或还有终端上行数据传输的原因值。可选的，挂起拒绝指示还可以包括终端上行和/或下行数据传输的承载信息，例如数据无线承载标识，或者服务质量(Quality of Sevice，QoS)流(flow)标识，或者分组数据单元(Packet Data Unit，PDU)会话标识等。
S801、在接收到状态切换指示信息后，终端将其RRC状态切换为第三态，并存储与辅站1对应的配置信息1。
配置信息1包括SCG承载的配置信息和SN承载的PDCP状态的至少一个。
可选的，SCG承载的配置信息可以包括以下信息中的任意一种或多种的组合：辅站1为终端提供服务的服务小区集合的信息，DRB标识，RLC配置。辅站1中服务小区集合至少包含一个主小区(也称为Special Cell或PScell)，还可以包含一个或多个辅小区。
除了上述配置信息1，终端在接收到状态切换指示信息后，还可以存储当前安全上下文、无线承载配置(SRB或DRB，具体承载类型可以为MN承载或SN承载)、源小区中使用的C-RNTI(C-RNTI used in the source PCell)、源小区的小区标识和物理小区标识(the cell Identity and the physical cell identity of the source PCell)以及终端标识1中的至少一个。
其中，无线承载配置可以包含以下信息中的任意一种或多种的组合：无线承载标识、无线链路控制(Radio Link Control，RLC)协议配置、分组数据汇聚协议PDCP的配置以及服务数据自适应协议(Service Data Adaptation Protocol，SDAP)配置。
当前安全上下文包括初始MN基础秘钥、初始SN基础秘钥、初始MN安全秘钥、初始SN安全秘钥、初始MN安全算法、初始SN安全算法、下一跳参数(Next Hop parameter，NH)以及NCC中的至少一个。
可选的，终端在接收到状态切换指示信息后，挂起除信令无线承载(Signalling Radio Bearer，SRB)0之外的所有SRB(例如SRB1和SRB2)和数据无线承载(Data Radio Bearer，DRB)。当SRB(例如SRB1)或DRB为分裂(Split)承载时，终端将SN链路(即通过SCG进行数据传输的链路)视为去激活。后续，当终端向主站2发送第一消息后，即执行S804后，恢复(resume)SRB(例如SRB1)或DRB时，仅恢复MN链路(即通过MCG进行数据传输的链路)，即通过MN链路进行信令或数据的传输。可选的，后续是否恢复SN链路取决于主站2发送的对SN链路的配置信息。
S802、在接收到挂起指示信息后，辅站1挂起(suspend)辅站1与终端之间的数据传输。
S803、辅站1向主站1发送挂起响应消息，用于指示辅站1与终端的数据传输已被挂起。
该挂起响应消息包括配置信息2。配置信息2包括用于指示辅小区组SCG承载的配置信息、SN承载的配置信息和所述SN承载的PDCP状态的至少一个。其中，SN承载的配置信息包括无线承载标识、PDCP的配置以及SDAP的配置中的至少一个。
可选的，该配置信息2还可以包括辅站1为终端分配的随机接入资源，便于主站1可存储辅站1为终端分配的随机接入资源。这样，若终端从第三态恢复到连接态，且在终端恢复到连接态后，辅站1依旧为终端提供服务，则主站2(或主站1)无需再通过接口消息向辅站1请求该随机接入资源，节省了终端获取随机接入资源，并根据该随机接入资源接入辅站1的时延。可选的，辅站1可以更新该随机接入资源，保证该随机接入资源的有效性。其中，辅站1更新该随机接入资源的流程可以为周期性的，也可以为辅站1发起的，还可以为主站1请求的，本申请实施例对此不作具体限定。
可选的，辅站1保留配置信息2。在辅站1保留配置信息2的场景中，若终端从第三态恢复到连接态，且在终端恢复到连接态后，辅站1依旧为终端提供服务，则辅站1无需对该终端进行重配置和/或重新建立NG/Xn连接，有效的提高了终端利用辅站空口进行数据传输的速率。需要说明的是，在辅站1保留配置信息2的场景中，辅站1可以删除配置信息2中的部分信息。例如辅站1删除SCG承载的配置信息，保留SN承载的配置信息和/或SN承载的PDCP状态。当辅站1由集中式单元(Centralized Unit，CU)和分布式单元(Distributed Unit，DU)组成时，CU可以通知DU删除DU上存储的终端上下文，例如SCG承载的配置信息。
可选的，在接收到挂起指示信息(例如携带在SN Release消息)后，辅站1删除该终端的上下文(其中包括配置信息2)，释放辅站1在辅站1与主站1之间的接口上为终端分配的专用资源(例如Xn接口控制面上该终端专用的信令连接，以及Xn接口用户面上该终端专用的GPRS隧道协议(GPRS Tunnelling Protocol，GTP)隧道)，释放辅站1在辅站1与5GC之间的接口上为该终端分配的专用资源(例如包含NG接口用户面上该终端专用的GTP隧道)。这个过程与为终端释放辅站的过程一致。在该场景中，若后续终端从第三态恢复到连接态，辅站1不再继续为终端提供服务，主站1无需再指示辅站1删除终端上下文和接口专用资源，即无需执行下述S915、S1018或S1116。该场景中，辅站1挂起辅站1与终端之间的数据传输可以理解为辅站1停止与终端的数据传输。
可选的，相应的，在接收到挂起响应消息后，主站1存储配置信息2。
需要说明的是，主站1在将终端由连接态切换为第三态后，主站1和辅站1将终端的通信挂起，但是，在终端的下行数据存在的场景中，核心网还是会向主站1或辅站1发送该终端的下行数据。当在辅站1保留了其与核心网之间的接口上为终端分配的专用资源的情况下，辅站1在上述接口上收到来自核心网的该终端的下行数据，辅站1向主站1发送寻呼请求指示，用于指示主站有该终端的下行数据到达。可选的，寻呼请求指示中携带数据转发地址请求信息，用于请求其他基站提供数据转发地址。 示例性的，该数据转发地址请求信息可以包括数据转发地址的个数，进行数据转发的无线承载的信息，进行数据转发的PDU会话的信息，进行数据转发的QoS流的信息中的至少一个。此时，主站1会向其他基站(例如主站2)发送Xn接口的寻呼消息，用于其他基站在各自的空口上发送寻呼消息，令该UE请求从第三态至连接态的切换。可选的，该Xn接口的寻呼消息还可以包含数据转发地址请求信息，用于请求其他基站提供数据转发地址。可选的，该数据转发地址请求信息可以为辅站提供的，也可以为主站依据自身收到的来自核心网的终端的下行数据生成的。相应的，若在S804中终端向主站2发送第一消息后，主站2向主站1发送上下文请求消息中可以携带为该终端分配的数据转发地址(例如下行Xn接口用户面地址)。主站2通过接口的寻呼消息中的终端标识1与第一消息中的终端标识2进行比对，从而确定是否为相同的终端。可选的，主站2提供的数据转发地址可以为该主站2为该终端分配的，或者为主站2向辅站2请求的辅站2为该终端分配的数据转发地址。可选的，若辅站1向主站1发送的寻呼请求指示包括数据转发地址请求信息，主站1将从主站2收到的数据转发地址发送给辅站1，用于辅站1按照该地址向主站2/辅站2进行数据转发。
S804、终端向主站2发送第一消息，用于请求终端从第三态至连接态的切换。
可选的，处于第三态的终端在移动过程中进行小区重选，并在选择的第一小区中驻留。这样，该终端需要向主站2(第一小区所属的接入网设备)发送第一消息。该第一消息具体用于请求恢复终端的RRC连接或者请求更新终端的位置区域(例如RNAU或TAU)。
示例性的，第一消息可以为随机接入流程中的第3消息(Message 3或MSG3)，该MSG3可以为RRC连接恢复请求(RRC Connection Resume Request)或者RRC恢复请求(RRC Resume Request)。
具体的，第一消息包括终端标识2和安全校验参数。
终端标识2可以与上述终端标识1相同，也可以是上述终端标识1的一部分。其中，终端标识1可以参考上述S800的描述，这里不再进行详细赘述。
安全校验参数用于主站2验证该终端的合法性。具体的，终端基于当前MN安全密钥衍生出该安全校验参数。在一种可选方式中，在基于第二安全参数衍生出与主站2通信的第一MN基础秘钥后，终端再基于该第一MN基础秘钥衍生出与主站2通信的第一MN安全秘钥，并将该第一MN安全秘钥作为当前MN安全秘钥。在另一种可选方式中，终端将与主站1通信的初始MN安全秘钥作为当前MN安全秘钥，例如：当前MN安全秘钥作为用于RRC信令的完整性保护秘钥。
可选的，第一消息还包括第一信息，该第一信息用于主站2确定为终端提供服务的辅站。
可选的，本申请中的第一信息为处于第三态的终端根据测量配置进行测量得到的。其中，测量配置包含以下信息中的至少一项或任意多项的组合：测量辅站的信息、测量小区的信息、测量量(Measurement Quantity)、预设频点、预设规则。
其中，测量辅站的信息用于指示终端需要测量的基站，可以包含基站标识和/或与该基站对应的索引值。测量小区的信息用于指示终端需要测量的基站，可以为测量辅站提供的小区或不区分所属基站的任意小区，可以包含小区标识和/或与该小区对应的 索引值。测量量用于指示终端需要测量的信号的属性或具体需要获得的测量值，例如：测量量可以为RRC测量值(层3测量)或媒体访问控制(Media Access Control，MAC)测量值(层2测量值)，也可以为参考信号接收功率(Reference Signal Receiving Power，RSRP)，还可以为参考信号接收质量(Reference Signal Receiving Quality，RSRQ)，还可以为波束相关测量值。预设频点用于指示终端测量该频点上的小区。预设规则用于指示终端基于该规则评估满足该规则的小区或基站，例如预设规则为信号质量高于预设阈值的小区。
终端获取测量配置的一种可实现方式为：终端通过终端专用信令接收主站1发送的测量配置，该终端专用信令可以为RRC连接释放(RRC Connection Release)消息或RRC释放(RRC Release)消息。示例性的，终端接收主站1发送的承载有测量配置与状态切换指示信息的RRC连接释放(RRC Connection Release)消息。
终端获取测量配置的另一种可实现方式为：终端通过读取系统广播消息获取测量配置。
需要说明的是，若终端在同一小区既能通过专用信令获得测量配置，又能通过系统广播消息获得测量配置，则终端采用专用信令获得测量配置。
终端获取测量配置的另一种可实现方式为：当处于第三态的终端移动到了新的小区，并从新的小区获取到了测量配置，则该终端丢弃之前已经获取到的测量配置，使用其从新小区获取到的测量配置。
可选的，第一信息包括至少一个测量小区中每个测量小区的信道质量；或者，第一信息用于指示所述为终端提供服务的辅站是辅站1；或者，第一信息用于指示所述为终端提供服务的辅站是辅站1，以及辅站1中满足预设条件的小区；或者，第一信息用于指示所述为终端提供服务的辅站是辅站2。
在第一信息包括至少一个测量小区中每个测量小区的信道质量的情况下，“至少一个测量小区中每个测量小区的信道质量”可以为RRC层测量结果或者MAC层测量结果。
当“至少一个测量小区中每个测量小区的信道质量”为RRC层的测量结果时，“至少一个测量小区中每个测量小区的信道质量”承载于RRC消息中。
当“至少一个测量小区中每个测量小区的信道质量”为MAC层的测量结果时，该MAC层的测量结果可以为信道质量指示(Channel Quality Indication，CQI)测量结果。
本申请实施例中的至少一个测量小区中每个测量小区的信道质量是终端在发送第一消息之前测量得到的。也就是说，在测量每个测量小区的信道质量时，本申请实施例中的终端处于第三态。
可选的，测量小区可以为辅站1的主小区，也可以为预设频点的小区，还可以为基站(如辅站1)指定的小区，本申请实施例对此不作具体限定。示例性的，若终端在连接态时的服务小区包含多个辅站1的小区，即Secondary Cell Group包含主小区和至少一个辅小区，则终端认为测量小区为主小区，辅小区是去激活的。若测量小区为基站指定的小区(如辅站1的主小区或辅小区)，则辅站1中其它未指定的小区(如辅站1的服务小区)被认为是去激活的。
当“至少一个测量小区中每个测量小区的信道质量”为MAC层的测量结果时，测量小区需要为终端提供待测信号。示例性的，若测量小区为辅站1的主小区，则辅站1的主小区可以持续为终端提供专用的测量信号。
可选的，终端在确定出至少一个测量小区中每个测量小区的信道质量后，可将每个测量小区的信道质量与预设阈值进行对比，将信道质量大于预设阈值的测量小区所归属的站点确定所述为终端提供服务的辅站，并向主站2发送该确定结果。也就是说，第一信息可以用于指示所述为终端提供服务的辅站是辅站1，或者用于指示所述为终端提供服务的辅站是辅站2。这种情况下，第一信息可以为站点索引，也可以为站点标识，还可以为用于唯一标识站点的其他信息，本申请实施例对此不作具体限定。
进一步地，终端在确定出所述为终端提供服务的辅站后，还可以确定出该辅站中满足预设条件的小区。这里的预设条件可以为终端接收来自辅站1的条件，也可以为系统预先设置好的。这样，第一信息可以用于指示所述为终端提供服务的辅站以及该辅站中满足预设条件的小区。
在第一信息用于指示所述为终端提供服务的辅站以及该辅站中满足预设条件的小区的情况下，第一信息可以包括小区标识或小区索引列表。小区索引列表中的小区索引值可以为该小区归属的基站分配的。示例性的，当所述为终端提供服务的辅站为辅站1时，第一信息具体用于指示所述为终端提供服务的辅站是辅站1，以及辅站1中满足预设条件的小区。
可选的，第一信息可以仅包括所述为终端提供服务的辅站中满足预设条件的小区的信息，这样，该第一信息可以隐含指示所述为终端提供服务的辅站。
容易理解的是，所述为终端提供服务的辅站可以为辅站1，也可以为辅站2。当所述为终端提供服务的辅站为辅站2时，本申请实施例中的测量小区包括辅站1中的部分小区和辅站2中的部分小区。
可选的，本申请实施例中的第一信息还可以用于指示所述为终端提供服务的辅站不是辅站1，以及至少一个测量小区中每个测量小区的信道质量，这样，主站1在接收到该第一信息后，可根据该第一信息确定出所述为终端提供服务的辅站。
在第一信息用于指示所述为终端提供服务的辅站不是辅站1，以及至少一个测量小区中每个测量小区的信道质量的情况下，该第一信息可以承载于第一消息中，还可以部分信息(如用于指示所述为终端提供服务的辅站不是辅站1的信息)承载于第一消息中，其他信息(如至少一个测量小区中每个测量小区的信道质量)承载于消息7中。对于第一信息的部分信息承载于第一消息中，其他信息承载于消息7中的情况，参考下述图10的描述，这里不再进行详细赘述。
当然，本申请实施例中的第一消息也可以不承载第一信息。在第一消息不承载第一信息的情况下，终端向主站2发送该第一消息后，主站2确定是否接受终端的请求，并在确定接受终端的请求后，向终端发送用于指示主站2与终端之间的连接恢复成功的消息。后续，该终端终端向主站2发送第一信息。
S805、主站2确定为终端提供服务的辅站。
在第一消息包括第一信息，该第一信息包括至少一个测量小区中每个测量小区的信道质量，或者，该第一信息用于指示所述为终端提供服务的辅站是辅站1，或者， 该第一信息用于指示所述为终端提供服务的辅站是辅站1，以及辅站1中满足预设条件的小区，或者，该第一信息用于指示所述为终端提供服务的辅站是辅站2的情况下，主站2根据该第一信息确定所述为终端提供服务的辅站。
可选的，当第一信息包括基站索引或小区索引时，主站2还需获得索引值与基站标识之间的对应关系。若主站1配置了索引值与基站标识之间的对应关系，则主站1需要向主站2发送该对应关系。具体的，主站1向主站2发送终端的上下文时，还同时发送该对应关系。
在第一消息仅包括用于指示所述为终端提供服务的辅站是否为辅站1的第一指示信息，至少一个测量小区中每个测量小区的信道质量承载于消息7的情况下，主站2根据消息7中的至少一个测量小区中每个测量小区的信道质量确定为终端提供服务的辅站。该情况具体可以参考下述图10的描述。
在第一消息不承载第一信息的情况下，主站2在向终端发送用于指示主站2与终端之间的连接恢复成功的消息后，接收终端发送的第一信息，并根据该第一信息确定所述为终端提供服务的辅站。该情况具体可以参考下述图11的描述，此处不再进行详细描述。
S806、主站2获取第一安全参数。
该第一安全参数用于衍生终端与所述为终端提供服务的辅站通信所使用的安全密钥。
可选的，主站2可以在确定出所述为终端提供服务的辅站后，确定第一安全参数，也可以从终端的上下文中获取第一安全参数。
在主站2未存储终端的上下文的情况下，主站2向主站1发送上下文请求消息，以获取终端的上下文，进而该主站2从终端的上下文中获取第一安全参数。在这种场景中，主站1需要确定第一安全参数，并将其存储于终端的上下文中。主站1也可以通过消息1将第一安全参数发送给终端，以使得该终端存储第一安全参数。
S807、主站2获取SCG的配置信息。
SCG的配置信息包括所述为终端提供服务的辅站为终端分配的随机接入资源、所述为终端提供服务的辅站中服务小区集合的信息和所述为终端提供服务的辅站的主小区的指示信息中的至少一个。
具体的，主站2获取终端的上下文，并基于该终端的上下文，获取SCG的配置信息。
其中，终端的上下文包括终端的无线接入能力信息(例如UE-Radio Access Capability Info)、终端的安全上下文、终端的RRC配置信息(例如包括AS-Config)、终端的无线管理控制配置(例如RRM-Config)、辅站1为终端分配的随机接入资源、终端标识1、配置信息2和用于指示终端的第一终端标识中的至少一个。该第一终端标识用于辅站1识别该终端。
这里，终端的安全上下文包括：初始MN基础秘钥、初始SN基础秘钥、初始MN安全秘钥、初始MN安全算法、初始SN安全秘钥、初始SN安全算法、NH、NCC、SN安全参数、第一安全参数、第一MN基础秘钥、第一MN安全秘钥、以及第二安全参数中的至少一个。
可选的，第一终端标识可以为辅站1在辅站1与主站1之间的接口上为终端分配的接口标识，例如：辅站1侧的UE XnAP ID。
可选的，若主站2为主站1，主站2自身存储了终端的上下文，则主站2根据终端的上下文，获取SCG的配置信息。可选的，若主站1已经向主站2发送终端的上下文，则主站2直接根据自身存储的终端的上下文，获取SCG的配置信息。若主站2未存储终端的上下文，则该主站2向存储有终端的上下文的设备发送上下文请求消息，以获取终端的上下文。
本申请实施例以主站2未存储终端的上下文、且存储有终端的上下文的设备为主站1为例进行说明。具体的，主站2向主站1发送用于请求获取终端的上下文的上下文请求消息，相应的，主站2接收来自主站1的终端的上下文。这里终端的上下文所包括的第一MN基础秘钥为主站1根据第二安全参数衍生得到的。可选的，主站1可以在接收到上下文请求消息后，衍生出第一MN基础密钥。此时，上下文请求消息还可以包括主站2的小区标识和频点信息，以便于主站1衍生第一MN基础秘钥。可选的，主站1也可以在接收到上下文请求消息前，衍生并存储该第一MN基础密钥。此时，第一MN基础秘钥与小区标识和频点信息无关。
在终端的上下文包括第一终端标识，为终端提供服务的辅站为辅站1的情况下，主站2在获取到终端的上下文后，向辅站1发送包括第一终端标识的消息2，用于请求辅站1分配SCG的配置。在接收到消息2后，辅站1确定SCG配置信息(例如辅站1为终端分配随机接入资源、确定服务小区集合的信息以及主小区等)，然后，辅站1向主站2发送该SCG配置信息。
由于第一终端标识可以为站点间接口的终端标识，当该第一终端标识为接口的唯一标识时，为了使得辅站1根据第一终端标识识别该终端，辅站1还需要得知与第一终端标识对应的对侧站点的标识，例如主站1的标识。示例性的，当第一终端标识为辅站1侧的UE XnAP ID时，辅站1可以通过主站1的标识与辅站1侧的UE XnAP ID，识别出该终端。
在终端的上下文包括配置信息2，为终端提供服务的辅站为辅站2的情况下，主站2基于第一安全参数和第一MN基础秘钥获得第一SN基础秘钥。主站2向辅站2发送包括配置信息2的消息3，用于请求辅站2分配SCG的配置。可选的，消息3还可以包括第一SN基础秘钥。在接收到消息3后，辅站2基于配置信息2确定SCG的配置信息(例如辅站2为终端分配随机接入资源、确定服务小区集合的信息以及主小区等)，然后，辅站2向主站2发送该SCG的配置信息。具体的，辅站2可以基于配置信息2中用于能力协商的信息、用于测量配置协商的信息、SN承载的信息、SN承载的配置信息以及SCG配置信息中的至少一个确定SCG的配置信息。可选的，SCG的配置信息包括以下信息中的任意一个或任意多个的组合：辅站为终端分配的小区无线网络临时标识(Cell Radio Network Temporary Identifier，C-RNTI)，辅站为终端分配随机接入资源，辅站为终端提供的服务小区集合的信息，辅站为终端提供的主小区。可选的，辅站2应用配置信息2中的SN承载的PDCP状态。例如后续为终端进行SN承载的数据传输时，继续使用PDCP状态中的序列号。这样，可以保证终端恢复数据传输后，SN承载的数据包的传输依然可以是按序的。
可选的，消息3还包括第一SN基础秘钥、终端的安全能力、初始SN安全算法以及主站2为该终端在主站2与辅站2之间的接口上分配的标识(例如MN UE XnAP ID)中的至少一个。其中，终端的安全能力和初始SN安全算法可以用于辅站2为该终端配置第一SN安全算法。示例性的，辅站2基于终端的安全能力与自身的安全算法配置为终端选择第一SN安全算法，并通知终端该第一SN安全算法。可选的，当辅站2为终端选择的第一SN安全算法与终端的初始SN安全算法相同时，辅站2无需向终端发送指示，此时，终端默认使用当前安全上下文中的初始SN安全算法作为第一SN安全算法；当辅站2为终端选择的第一SN安全算法与初始SN安全算法不同时，辅站2将第一SN安全算法携带在SCG配置信息中，由主站2发送给终端。也就是说，第一SN安全算法可以为显示或者隐式的指示。例如，若SCG的配置信息并未显示的指示第一安全算法，则说明第一SN安全算法与初始SN安全算法相同。
S808、主站2向终端发送包括第一安全参数和SCG的配置信息的第二消息。
可选的，主站2获取用于与终端通信所使用的第一MN安全算法，并根据第一MN基础密钥和第一MN安全算法，得到第一MN安全秘钥。这样，主站2可采用第一MN安全密钥对第二消息进行安全保护。
可选的，主站2可自行确定第一MN安全算法，也可以将初始MN安全算法确定为第一MN安全算法，本申请实施例对此不作具体限定。
可选的，第二消息还包括第一MN安全算法和/或第二安全参数，以用于终端衍生得到第一MN基础秘钥和/或第一MN安全秘钥。
结合上述描述可知，若主站2根据第一消息中的第一信息直接确定出所述为终端提供服务的辅站，则第二消息可以用于指示主站2与终端之间的连接恢复的成功，此时第二消息为随机接入过程中的第四消息(Message 4或MSG4)。示例性的，MSG4为RRC连接恢复(RRC Connection Resume)消息，或RRC恢复(RRC Resume)消息，或RRC重配值消息，或RRC连接重配置消息等。若第一信息未承载于第一消息中，第二消息可以为RRC重配值消息或RRC连接重配值消息。
S809、终端在接收到第二消息后，根据第一安全参数和SCG的配置信息，完成与所述为终端提供服务的辅站的通信连接。
具体的，终端根据接收到的第一安全参数和第一MN基础密钥，衍生得到第一SN基础秘钥，这样，该终端即可根据第一SN基础密钥和第一SN安全算法衍生得到第一SN安全密钥。终端根据第一SN安全密钥和SCG的配置信息可迅速建立与所述为终端提供服务的辅站之间的通信连接。
可选的，若第二消息中还包括第二安全参数(例如，第二安全参数为NCC)，则终端基于第二安全参数衍生得到第一MN基础秘钥。示例性的，终端基于收到的NCC和自身存储的NH衍生得到第一MN基础秘钥。
可选的，SCG的配置信息中的部分/全部信息可以与配置信息1中的部分/全部信息相同，这样，终端建立与所述为终端提供服务的辅站之间的通信连接的效率会进一步提高。
综上，本申请中的终端能够同时获取到第一安全参数和SCG的配置信息，这样该终端可直接根据第一安全参数和SCG的配置信息完成与所述为终端提供服务的辅 站之间的通信连接，有效的提高了在终端从第三态恢复到连接态时，配置SCG的速率，进一步提高了终端利用辅站的空口进行数据传输的效率。
此外，本申请实施例中的主站2在获取到第一安全参数后，也可直接向终端发送该第一安全参数(即第一安全参数和SCG的配置信息承载于不同的消息中)，以便于后续在终端与所述为终端提供服务的辅站通信时，使用该参数对通信数据进行安全保护。
为了便于描述，本申请实施例以第一安全参数和SCG的配置信息同时承载于第二消息为例进行说明。
从上面描述可知，本申请实施例中的第一信息可以仅承载于第一消息或者消息7，或者，第一信息的部分承载于第一消息，剩余部分承载于消息7。现分别针对每一种情况进行说明。
结合上述图8，在第一信息承载于第一消息，主站2根据第一消息中的第一信息确定所述为终端提供服务的辅站的情况下，图9示出了本申请提供的通信方法的流程。
如图9所示，该通信方法包括S800～S803以及S901～S915。S800～S803可以参考上述描述，这里不再进行详细赘述。现对S901～S915进行介绍。
S901、终端向主站2发送包括第一信息的第一消息，用于请求终端从第三态至连接态的切换。
第一信息的描述可以参考上述S804，此处不再对此进行详细赘述。
S902、主站2判断是否存储有终端的上下文。
响应于第一消息，主站2需要根据终端的上下文确定是否接受终端的请求。
具体的，若主站2存储有终端的上下文，且主站2对终端的校验结果为校验成功，则该主站2接受终端的请求，后续该主站2判断所述为终端提供服务的辅站是否发生变更，即主站2顺序执行S905。若主站2没有存储终端的上下文，则该主站2向主站1发送上下文请求消息，以获取终端的上下文，即顺序执行S903。
S903、主站2向主站1发送上下文请求消息，请求获取终端的上下文。
主站2根据第一消息中的终端标识2识别出存储了终端的上下文的站点。以存储了终端的上下文的站点为主站1为例。具体的，主站2向主站1发送上下文请求消息，用于请求获取终端的上下文。其中，上下文请求消息可以包括用于主站1识别终端的终端标识2和用于主站1对终端进行校验的安全校验参数。
S904、主站1向主站2发送终端的上下文。
具体的，主站1根据上下文请求消息中的安全校验参数对终端进行校验。若校验通过，则主站1向主站2发送终端的上下文。终端的上下文的描述可以参考上述S807中终端的上下文的描述，这里不再赘述。
S905、主站2获取第一MN基础秘钥。
可选的，主站2可以从终端的上下文获取第一MN基础秘钥，即主站1衍生出第一基础秘钥，并将其发送给主站2。主站2也可以从核心网获得NH和第二安全参数，并衍生得到第一MN基础秘钥。
S906、主站2根据第一信息确定为终端提供服务的辅站，并获取第一安全参数。
主站2在确定出为终端提供服务的辅站后，获取与该站点相关的第一安全参数。
在一种实现方式中，若所述为终端提供服务的辅站为辅站1，则主站2可以从终端的上下文中获取第一安全参数；所述为终端提供服务的辅站为辅站2，则主站2自行确定第一安全参数。
在另一种实现方式中，在所述为终端提供服务的辅站为辅站1和在所述为终端提供服务的辅站为辅站2的情况下，主站2均自行确定第一安全参数，减少了主站2判断所述为终端提供服务的辅站为哪一设备的时延。
可选的，在上述S803中描述的辅站1保留配置信息2的场景中，主站2根据终端的上下文能够确定出辅站1为该终端在进去第三态之前为该终端提供服务的辅站，在主站2根据第一信息确定出为终端提供服务的辅站后，主站2判断所述为终端提供服务的辅站是否为辅站1。若所述为终端提供服务的辅站为辅站1，则主站2顺序执行S907和S908；若所述为终端提供服务的辅站为辅站2，则主站2执行S909。
可选的，在上述S803中描述的辅站1删除终端的上下文，释放辅站1在辅站1与主站1之间的接口上为终端分配的专用资源，且释放辅站1在辅站1与5GC之间的接口上为终端分配的专用资源的情况下，主站2无需判断为终端服务的辅站是否为辅站1，主站2顺序执行S909。
本申请实施例中的主站2可以先执行S903，后执行S906，也可以先执行S906，后执行S903，还可以同时执行S903和S906，本申请实施例对此不作具体限定。
S907、主站2向辅站1发送消息2。
该消息2包括第一终端标识和配置信息2中的至少一个。
可选的，消息2还可以包括主站1的标识和终端标识1中的至少一个。这样，辅站2可根据消息2中的信息获取到终端的上下文。
S908、辅站1向终端发送SCG的配置信息。
SCG配置信息可以参考S807中的描述。
本申请实施例提供的通信方法在执行S908之后，顺序执行S911。
S909、主站2向辅站2发送包括配置信息2的消息3。
在主站2确定所述为终端提供服务的辅站为辅站2的情况下，S906之后顺序执行S909和S910。
可选的，消息3还可以包括第一SN基础秘钥、终端安全能力、初始SN安全算法以及主站2为终端在主站2与辅站2之间的接口上分配的标识中的至少一个。
在第一消息包括至少一个测量小区中每个测量小区的信道质量的情况下，消息3还可以包括所述至少一个测量小区中每个测量小区的信道质量。同理，在第一消息包括满足预设条件的小区的信息的情况下，消息3还可以包括该小区的信息。
S910、辅站2向主站2发送SCG的配置信息。
可选的，SCG的配置信息承载于消息5中。
本申请实施例提供的通信方法在执行S910之后，顺序执行S911。
S911、主站2向终端发送包括第一安全参数和SCG的配置信息的第二消息。
S912、终端根据第一安全参数，衍生第一SN基础密钥，并根据第一SN基础密钥，确定第一SN安全密钥。
S913、终端根据第一SN安全密钥和SCG的配置信息建立与所述为终端提供服务 的辅站之间的通信连接。
具体的，当所述为终端提供服务的辅站为辅站1，则终端根据第一SN安全密钥和SCG的配置信息建立与辅站1之间的通信连接。当所述为终端提供服务的辅站为辅站2，则终端根据第一SN安全密钥和SCG的配置信息建立与辅站2之间的通信连接。
可选的，本申请实施例提供的通信方法还可以包括S914和S915。
S914(可选的)、主站2向主站1发送第一指示信息。
该第一指示信息用于指示所述为终端提供服务的辅站是辅站1，或者，第一指示信息用于指示所述为终端提供服务的辅站不是辅站1。
可选的，第一指示信息可以通过预设数值表示(例如1比特信息)，也可以为辅站的标识或者为辅站的索引，本申请实施例对此不作具体限定。
若主站2在发送上下文请求消息之前已经确定出所述为终端提供服务的辅站，则该第一指示信息可以承载于上下文请求消息中。
S915(可选的)、主站1向辅站1发送删除释放指示信息/保留释放指示信息。
具体的，在第一指示信息指示所述为终端提供服务的辅站不是辅站1的情况下，主站1向辅站1发送删除释放指示信息，使得辅站1删除该终端的上下文、释放辅站1在与主站1之间的接口上为UE分配的专用资源并释放辅站1在与5GC之间的接口上为UE分配的专用资源。在所述为终端提供服务的辅站是辅站1的情况下，主站1向辅站1发送保留释放指示信息，使得辅站1保留该终端的上下文，并释放辅站1与主站1之间的接口上为UE分配的专用资源。这样能够有效的减少资源的占用率。
S914和S915为可选的，因此，图9中用虚线表示。
可以看出，图9示出的实施例中主站2可根据第一消息中的第一信息直接确定出所述为终端提供服务的辅站，并同时向终端发送SCG的配置信息和第一安全参数，使得终端能够快速恢复与所述为终端提供服务的辅站之间的通信连接。
在第一消息承载用于指示所述为终端提供服务的辅站是否为辅站1的第一指示信息，至少一个测量小区中每个测量小区的信道质量承载于消息7的情况下，图10示出了本申请提供的通信方法的流程。
需要特别说明的是，该方法尤其适用于辅站1保留终端上下文的场景，即上述S803中辅站1保留终端的上下文，保留辅站1在与主站1之间的接口上为UE分配的专用资源，保留辅站1在与5GC之间的接口上为UE分配的专用资源的场景。
结合上述图9，如图10所示，该通信方法包括S800～S803以及S1001～S1018。S800～S803可以参考上述描述，这里不再进行详细赘述。现对S1001～S1018进行介绍。
S1001、终端向主站2发送包括第一指示信息的第一消息，用于请求终端从第三态至连接态的切换。
其中，第一指示信息用于指示所述为终端提供服务的辅站是否为辅站1。
终端在处于第三态时，可对至少一个测量小区中的每个测量小区的信道质量进行测量，并根据测量结果确定为终端提供服务的辅站是否为辅站1，即根据测量结果确定第一指示信息。测量小区的描述可以参考上述S804中对测量小区的描述，这里不再进行详细赘述。
S1002、主站2判断是否存储有终端的上下文。
S1002可以参考上述S902。若主站2存储有终端的上下文，且主站2对终端的校验结果为校验成功，则该主站2接受终端的请求，后续该主站2判断所述为终端提供服务的辅站是否发生变更，即主站2顺序执行S1005。若主站2没有存储终端的上下文，则该主站2向主站1发送上下文请求消息，以获取终端的上下文，即顺序执行S1003。
S1003、主站2向主站1发送上下文请求消息，请求获取终端的上下文。
在主站2未存储有终端的上下文的情况下，主站2向主站1发送上下文请求消息。S1003可以参考上述S903，此处不再进行详细赘述。
S1004、主站1向主站2发送终端的上下文。
S1004可以参考上述S904，此处不再进行详细赘述。
S1005、主站2获取第一MN基础秘钥。
S1005可以具体参考上述S905。
若第一指示信息用于指示所述为终端提供服务的辅站为辅站1，顺序执行S1006～S1011。
若第一指示信息用于指示所述为终端提供服务的辅站不为辅站1，顺序执行S1012～S1016。
S1006、主站2从终端的上下文中获取第一安全参数。
S1007、主站2向辅站1发送消息2。
S1007可以参考上述S907，此处不再进行详细赘述。
S1008、辅站1向终端发送SCG的配置信息。
S1008可以参考上述S908，此处不再进行详细赘述。
S1009、主站2向终端发送包括第一安全参数和SCG的配置信息的第二消息。
S1010、终端根据第一安全参数，衍生第一SN基础密钥，并根据第一SN基础密钥，确定第一SN安全密钥。
S1011、终端根据第一SN安全密钥和SCG的配置信息建立与所述为终端提供服务的辅站之间的通信连接。
S1012、主站2向终端发送消息6。
该消息6用于指示终端与主站2之间的连接恢复的成功完成。此时消息6可以为RRC恢复(RRC Resume)消息，也可以为RRC连接恢复(RRC Connection Resume)消息，还可以为RRC重配(RRC Reconfiguration)消息，还可以为RRC连接重配(RRC Connection Reconfiguration)消息。
可选的，消息6还用于指示终端上报用于选择新的辅站的辅助信息。
S1013、终端向主站2发送包括至少一个测量小区中每个测量小区的信道质量的消息7。
示例性的，消息7可以用于指示终端已经完成与主站2之间的连接恢复。此时消息7可以为RRC恢复完成(RRC Resume Complete)消息，也可以为RRC连接恢复完成(RRC Connection Resume Complete)消息，还可以为RRC重配完成(RRC Reconfiguration Complete)消息，还可以为RRC连接重配完成(RRC Connection Reconfiguration Complete)消息。此外，消息7还可以为用于上报测量结果的消息， 例如测量报告(Measurement Report)消息。
可选的，这里至少一个测量小区中每个测量小区的信道质量为终端处于第三态时测量得到的，有效的减少了终端恢复辅站连接的速率。其中，测量小区的描述可以参考上述S804中测量小区的描述，这里不再进行详细赘述。
S1014、主站2根据至少一个测量小区中每个测量小区的信道质量确定为终端提供服务的辅站。
这里以辅站2是所述为终端提供服务的辅站为例进行说明。主站2在确定出辅站2后，确定第一安全参数。
S1015、主站2向辅站2发送包括配置信息2的消息3。
S1015可以参考上述S909的描述，此处不再进行详细赘述。
S1016、辅站2向主站2发送SCG的配置信息。
S1016可以参考上述S910的描述，此处不再进行详细赘述。
在S1016之后，顺序执行S1009～S1011。
可选的，本申请实施例提供的通信方法还可以包括S1017和S1018。
S1017(可选的)、主站2向主站1发送第一指示信息。
S1017可以参考上述S914的描述，这里不再进行详细赘述。
S1018(可选的)、主站1向辅站1发送删除释放指示信息/保留释放指示信息。
具体的，在第一指示信息指示所述为终端提供服务的辅站不是辅站1的情况下，主站1向辅站1发送删除释放指示信息，使得辅站1删除配置信息2，并释放辅站1与主站1之间连接。
在所述为终端提供服务的辅站是辅站1的情况下，主站1向辅站1发送保留释放指示信息，使得辅站1保留配置信息2，并释放辅站1与主站1之间连接。这样能够有效的减少资源的占用率。
S1017和S1018为可选的，因此，图10中用虚线表示。
可以看出，在图10示出的实施例中，终端在处于第三态时对每个测量小区的信道质量进行测量，这样，在主站2需要获取至少一个测量小区中每个测量小区的信道质量的时候，该终端可直接向主站2发送每个测量小区的信道质量，提高了终端恢复与所述为终端提供服务的辅站之间的通信连接的速率。
在第一消息未承载第一信息的情况下，图11示出了本申请提供的通信方法的流程。
结合上述图9，如图11所示，该通信方法包括S800～S803以及S1101～S1116。S800～S803可以参考上述描述，这里不再进行详细赘述。现对S1101～S1116进行介绍。
S1101、终端向主站2发送不包括第一信息的第一消息，用于请求终端从第三态至连接态的切换。
S1102、主站2判断是否存储有终端的上下文。
S1102可以参考上述S902。若主站2存储有终端的上下文，且主站2对终端的校验结果为校验成功，则该主站2接受终端的请求，向终端发送消息6，即主站2顺序执行S1105。若主站2没有存储终端的上下文，则该主站2向主站1发送上下文请求消息，以获取终端的上下文，即顺序执行S1103。
S1103、主站2向主站1发送上下文请求消息，请求获取终端的上下文。
S1103可以参考上述S903，此处不再进行详细赘述。
S1104、主站1向主站2发送终端的上下文。
S1104可以参考上述S904，此处不再进行详细赘述。
S1105、主站2向终端发送消息6。
主站2在确定接受终端的请求后，向终端发送消息6。该消息6用于指示终端与主站2之间的连接恢复的完成。此时消息6可以为RRC恢复(RRC Resume)消息，也可以为RRC连接恢复(RRC Connection Resume)消息，还可以为RRC重配(RRC Reconfiguration)消息，还可以为RRC连接重配(RRC Connection Reconfiguration)消息。
可选的，消息6还用于指示终端上报用于选择新的辅站的第一信息。
S1106、终端向主站2发送包括第一信息的消息7。
示例性的，消息7可以为用于指示终端已经完成与主站2之间的连接恢复，此时消息7可以为RRC恢复完成(RRC Resume Complete)消息，也可以为RRC连接恢复完成(RRC Connection Resume Complete)消息，还可以为RRC重配完成(RRC Reconfiguration Complete)消息，还可以为RRC连接重配完成(RRC Connection Reconfiguration Complete)消息。此外，消息7还可以为用于上报测量结果的消息，例如测量报告(Measurement Report)消息。
可选的，这里的第一信息为终端处于第三态时确定的。消息7与上述S901中的第一消息类似，此处不再进行详细赘述。
S1107、主站2根据第一信息确定为终端提供服务的辅站，并获取第一安全参数。
S1107可以参考上述S906，此处不再进行详细赘述。
若所述为终端提供服务的辅站为辅站1，则主站2顺序执行S1108和S1109；若所述为终端提供服务的辅站为辅站2，则主站2执行S1110和S1111。
S1108、主站2向辅站1发送消息2。
S1108可以参考上述S907，此处不再进行详细赘述。
S1109、辅站1向终端发送SCG的配置信息。
S1109可以参考上述S908，此处不再进行详细赘述。
本申请实施例提供的通信方法在执行S1109之后，顺序执行S1112。
S1110、主站2向辅站2发送包括配置信息2的消息3。
S1110可以参考上述S909，此处不再进行详细赘述。
S1111、辅站2向主站2发送SCG的配置信息。
S1111可以参考上述S910，此处不再进行详细赘述。
本申请实施例提供的通信方法在执行S1111之后，顺序执行S1112。
S1112、主站2向终端发送包括第一安全参数和SCG的配置信息的第二消息。
S1112可以参考上述S911，此处不再进行详细赘述。
S1113、终端根据第一安全参数，衍生第一SN基础密钥，并根据第一SN基础密钥，确定第一SN安全密钥。
S1113可以参考上述S912，此处不再进行详细赘述。
S1114、终端根据第一SN安全密钥和SCG的配置信息建立与所述为终端提供服务的辅站之间的通信连接。
S1114可以参考上述S913，此处不再进行详细赘述。
可选的，本申请实施例提供的通信方法还可以包括S1115和S1116。
S1115(可选的)、主站2向主站1发送第一指示信息。
S1115可以参考上述S914，此处不再进行详细赘述。
S1116(可选的)、主站1向辅站1发送删除释放指示信息/保留释放指示信息。
S1116可以参考上述S915，此处不再进行详细赘述。
S1115和S1116为可选的，因此，图11中用虚线表示。
可以看出，图11示出的实施例中终端处于第三态时确定出第一信息，主站2可根据消息7中的第一信息直接确定出所述为终端提供服务的辅站，并同时向终端发送SCG的配置信息和第一安全参数，使得终端能够快速恢复与所述为终端提供服务的辅站之间的通信连接。
除了上述描述，本申请实施例中的辅站1在接收到挂起指示信息后，还可以向主站1发送配置信息2，并删除自身存储的配置信息2。这样，辅站1无需再维护配置信息2。在这种情况下，本申请实施例提供的通信方法中其他设备的处理与上述描述类似，这里对此不再进行详细赘述。
需要说明的是，上述图8、图9和图10所述的通信方法也适用于终端位置区域更新(例如RAN Network Area Update，RANU)的情况，即终端发送的第一消息具体用于请求更新终端的位置区域(例如RNAU)。此时，主站2无需选择为终端提供服务的辅站，终端也无需提供第一信息。因此，无需执行上述S805～S809、S905～S913、S1005～S1016、S1107～S1114。可选的，在辅站1保留了终端的上下文，保留了辅站1在与主站1之间的接口上为终端分配的专用资源，以及保留了辅站1在与5GC之间的接口上为UE分配的专用资源的情况下，主站2向主站1发送的第一指示信息用于表示请求更新终端的位置区域(例如携带RNAU的原因值)，则主站1向辅站1发送删除释放指示信息，用于指示辅站1删除该终端的上下文，且释放辅站1在与主站1之间的接口上为UE分配的专用资源，且释放辅站1在与5GC之间的接口上为UE分配的专用资源。可选的，第一指示信息可以承载在上下文请求消息中。若主站1安全校验成功，则向辅站1发送删除释放指示信息。可选的，在主站2允许终端进行位置区域更新的情况下，主站2向核心网发送路径更新(Path Switch)请求，其中携带SN承载的分组数据单元(Packet Data Unit，PDU)会话(session)标识，以及主站2为其分配的主站2在与5GC之间的接口上为UE分配的专用资源(例如下行NG接口用户面地址)，用于5GC将其保存的与该SN承载对应的辅站1在与5GC之间的接口上为UE分配的专用资源(例如下行NG接口用户面地址)替换为主站2在主站2在与5GC之间的接口上为UE分配的专用资源。需要说明的是，该位置区域更新的路径更新的方法可以作为单独的方法独立使用，也可以与本申请实施例中的其他步骤组合使用，本申请不作限定。
本申请实施例提供一种通信装置12，该通信装置12可以为基站，如eLTE eNB或gNB，也可以为基站中的部分装置，例如基站中的芯片系统。可选的，该芯片系统， 用于支持基站实现上述方法实施例中所涉及的功能，例如，接收，发送，或处理上述方法中所涉及的数据和/或信息。该芯片系统包括芯片，也可以包括其他分立器件或电路结构。
该通信装置12用于执行以上通信方法中的主站1、主站2、辅站1或辅站2所执行的步骤。本申请实施例提供的通信装置12可以包括相应步骤所对应的模块。
本申请实施例可以根据上述方法示例对通信装置12进行功能模块的划分，例如，可以对应各个功能划分各个功能模块，也可以将两个或两个以上的功能集成在一个处理模块中。上述集成的模块既可以采用硬件的形式实现，也可以采用软件功能模块的形式实现。本申请实施例中对模块的划分是示意性的，仅仅为一种逻辑功能划分，实际实现时可以有另外的划分方式。
在采用对应各个功能划分各个功能模块的情况下，图12示出通信装置12的一种可能的结构示意图。如图12所示，通信装置12包括发送单元121、处理单元122以及接收单元123。发送单元121用于支持该通信装置12执行上述图8～图11中所示的发送操作，例如：S800、S803、S808、S903、S904、S907、S908、S909、S910、S911、S915、S1003、S1004、S1007、S1008、S1009、S1012、S1015、S1016、S1017、S1018、S1103、S11104、S1105、S1108、S1109、S1110、S1111、S1112、S1115、S1116等，和/或用于本文所描述的技术的其它过程；处理单元122用于支持该通信装置12执行上述图8～图11中所示的处理操作，例如：S802、S805、S806、S807、S902、S905、S906、S1002、S1005、S1006、S1014、S1102、S1107等，和/或用于本文所描述的技术的其它过程；接收单元123用于支持该通信装置12执行上述图8～图11中所示的接收操作，例如：S803、S903、S904、S907、S908、S909、S910、S915、S1003、S1004、S1007、S1008、S1013、S1015、S1016、S1017、S1018、S1101、S1103、S11104、S1108、S1109、S1110、S1111、S1115、S1116等，和/或用于本文所描述的技术的其它过程。当然，本申请实施例提供的通信装置12包括但不限于上述模块，例如通信装置12还可以包括存储单元124。存储单元124可以用于存储该通信装置12的程序代码。其中，上述方法实施例涉及的各步骤的所有相关内容均可以援引到对应功能模块的功能描述，在此不再赘述。
当通信装置12为基站时，上述处理单元122可以是图6中的处理器61，发送单元121和接收单元123可以是图6中的收发器64，存储单元124可以是图6中的存储器62。
本申请另一实施例还提供一种计算机可读存储介质，该计算机可读存储介质中存储有指令，当指令在通信装置12上运行时，该通信装置12执行如图8～图11所示的实施例的通信方法中主站1的步骤，或者执行如图8～图11所示的实施例的通信方法中主站2的步骤，或者执行如图8～图11所示的实施例的通信方法中辅站1的步骤，或者执行如图8～图11所示的实施例的通信方法中辅站2的步骤。
在本申请的另一实施例中，还提供一种计算机程序产品，该计算机程序产品包括计算机执行指令，该计算机执行指令存储在计算机可读存储介质中；通信装置12的处理器可以从计算机可读存储介质读取该计算机执行指令，处理器执行该计算机执行指令使得通信装置12执行如图8～图11所示的实施例的通信方法中主站1的步骤，或者 执行如图8～图11所示的实施例的通信方法中主站2的步骤，或者执行如图8～图11所示的实施例的通信方法中辅站1的步骤，或者执行如图8～图11所示的实施例的通信方法中辅站2的步骤。
本申请实施例提供一种通信装置13，该通信装置13可以为终端，也可以为终端中的部分装置，例如终端中的芯片系统。可选的，该芯片系统，用于支持终端实现上述方法实施例中所涉及的功能，例如，接收，发送，或处理上述方法中所涉及的数据和/或信息。该芯片系统包括芯片，也可以包括其他分立器件或电路结构。
该通信装置13用于执行以上通信方法中的终端所执行的步骤。本申请实施例提供的通信装置13可以包括相应步骤所对应的模块。
本申请实施例可以根据上述方法示例对通信装置13进行功能模块的划分，例如，可以对应各个功能划分各个功能模块，也可以将两个或两个以上的功能集成在一个处理模块中。上述集成的模块既可以采用硬件的形式实现，也可以采用软件功能模块的形式实现。本申请实施例中对模块的划分是示意性的，仅仅为一种逻辑功能划分，实际实现时可以有另外的划分方式。
在采用对应各个功能划分各个功能模块的情况下，图13示出了本实施例中通信装置13的一种可能的结构示意图。如图13所示，通信装置13包括发送单元131、处理单元132以及接收单元133。发送单元131用于支持该通信装置13执行上述图8～图11中所示的发送操作，例如：S804、S901、S1001、S1101、S1106等，和/或用于本文所描述的技术的其它过程；处理单元132用于支持该通信装置13执行上述图8～图11中所示的处理操作，例如：S801、S809、S912、S913、S1010、S1011、S1113、S1114等，和/或用于本文所描述的技术的其它过程；接收单元133用于支持该通信装置13执行上述图8～图11中所示的接收操作，例如：S800、S808、S911、S1009、S1012、S1105、S1112等，和/或用于本文所描述的技术的其它过程。其中，上述方法实施例涉及的各步骤的所有相关内容均可以援引到对应功能模块的功能描述，在此不再赘述。当然，本申请实施例提供的通信装置13包括但不限于上述模块，例如通信装置13还可以包括存储单元134。存储单元134可以用于存储该通信装置13的程序代码和数据。
本申请提供的通信装置13的实体框图可以参考上述图7。当通信装置13为手机时，上述处理单元132可以是图7中的处理器701，发送单元131和接收单元133可以是图7中的射频电路702连接的天线，存储单元134可以是图7中的存储器703。
本申请另一实施例还提供一种计算机可读存储介质，该计算机可读存储介质中存储有指令，当指令在通信装置13上运行时，该通信装置13执行如图8～图11所示的实施例的通信方法中终端的步骤。
在本申请的另一实施例中，还提供一种计算机程序产品，该计算机程序产品包括计算机执行指令，该计算机执行指令存储在计算机可读存储介质中；通信装置13的处理器可以从计算机可读存储介质读取该计算机执行指令，处理器执行该计算机执行指令使得通信装置13执行如图8～图11所示的实施例的通信方法中终端的步骤。
在上述实施例中，可以全部或部分的通过软件，硬件，固件或者其任意组合来实现。当使用软件程序实现时，可以全部或部分地以计算机程序产品的形式出现。计算机程序产品包括一个或多个计算机指令。在计算机上加载和执行计算机程序指令时， 全部或部分地产生按照本申请实施例的流程或功能。计算机可以是通用计算机、专用计算机、计算机网络、或者其他可编程装置。计算机指令可以存储在计算机可读存储介质中，或者从一个计算机可读存储介质向另一个计算机可读存储介质传输，例如，计算机指令可以从一个网站站点、计算机、服务器或数据中心通过有线(例如同轴电缆、光纤、数字用户线(DSL))或无线(例如红外、无线、微波等)方式向另一个网站站点、计算机、服务器或数据中心传输。计算机可读存储介质可以是计算机能够存取的任何可用介质或者是包括一个或多个可用介质集成的服务器、数据中心等数据终端设备。该可用介质可以是磁性介质，(例如，软盘，硬盘、磁带)、光介质(例如，DVD)或者半导体介质(例如固态硬盘Solid State Disk(SSD))等。
通过以上的实施方式的描述，所属领域的技术人员可以清楚地了解到，为描述的方便和简洁，仅以上述各功能模块的划分进行举例说明，实际应用中，可以根据需要而将上述功能分配由不同的功能模块完成，即将装置的内部结构划分成不同的功能模块，以完成以上描述的全部或者部分功能。
在本申请所提供的几个实施例中，应该理解到，所揭露的装置和方法，可以通过其它的方式实现。例如，以上所描述的装置实施例仅仅是示意性的，例如，所述模块或单元的划分，仅仅为一种逻辑功能划分，实际实现时可以有另外的划分方式，例如多个单元或组件可以结合或者可以集成到另一个装置，或一些特征可以忽略，或不执行。另一点，所显示或讨论的相互之间的耦合或直接耦合或通信连接可以是通过一些接口，装置或单元的间接耦合或通信连接，可以是电性，机械或其它的形式。
所述作为分离部件说明的单元可以是或者也可以不是物理上分开的，作为单元显示的部件可以是一个物理单元或多个物理单元，即可以位于一个地方，或者也可以分布到多个不同地方。可以根据实际的需要选择其中的部分或者全部单元来实现本实施例方案的目的。
另外，在本申请各个实施例中的各功能单元可以集成在一个处理单元中，也可以是各个单元单独物理存在，也可以两个或两个以上单元集成在一个单元中。上述集成的单元既可以采用硬件的形式实现，也可以采用软件功能单元的形式实现。
所述集成的单元如果以软件功能单元的形式实现并作为独立的产品销售或使用时，可以存储在一个可读取存储介质中。基于这样的理解，本申请实施例的技术方案本质上或者说对现有技术做出贡献的部分或者该技术方案的全部或部分可以以软件产品的形式体现出来，该软件产品存储在一个存储介质中，包括若干指令用以使得一个设备(可以是单片机，芯片等)或处理器(processor)执行本申请各个实施例所述方法的全部或部分步骤。而前述的存储介质包括：U盘、移动硬盘、只读存储器(Read-Only Memory，ROM)、随机存取存储器(Random Access Memory，RAM)、磁碟或者光盘等各种可以存储程序代码的介质。
以上所述，仅为本申请的具体实施方式，但本申请的保护范围并不局限于此，任何在本申请揭露的技术范围内的变化或替换，都应涵盖在本申请的保护范围之内。因此，本申请的保护范围应以所述权利要求的保护范围为准。

Claims (34)

  1. 一种通信方法，其特征在于，包括：
    第一主站接收来自终端的第一消息，所述第一消息用于请求所述终端从第三态至连接态的切换；
    所述第一主站确定为所述终端提供服务的辅站；
    所述第一主站获取第一安全参数，所述第一安全参数用于所述终端与所述为所述终端提供服务的辅站通信所使用的安全密钥的衍生；
    所述第一主站获取辅小区组SCG的配置信息，所述SCG的配置信息包括所述为所述终端提供服务的辅站为所述终端分配的随机接入资源、所述为所述终端提供服务的辅站中服务小区集合的信息和所述为所述终端提供服务的辅站的主小区的指示信息中的至少一个；
    所述第一主站向所述终端发送第二消息，所述第二消息包括所述第一安全参数和所述SCG的配置信息。
  2. 根据权利要求1所述的通信方法，其特征在于，所述第一主站确定为所述终端提供服务的辅站，具体包括：
    所述第一主站接收来自所述终端的第一信息，所述第一信息用于所述第一主站确定所述为所述终端提供服务的辅站；
    所述第一主站根据所述第一信息，确定所述为所述终端提供服务的辅站；
    其中，所述第一信息包括至少一个测量小区中每个测量小区的信道质量；或者，所述第一信息用于指示所述为所述终端提供服务的辅站是第一辅站；或者，所述第一信息用于指示所述为所述终端提供服务的辅站是第一辅站，以及所述第一辅站中满足预设条件的小区；或者，所述第一信息用于指示所述为所述终端提供服务的辅站是第二辅站；或者，所述第一信息用于指示所述为所述终端提供服务的辅站不是第一辅站，以及第二辅站的标识；或者，所述第一信息用于指示所述为所述终端提供服务的辅站不是第一辅站，以及至少一个测量小区中每个测量小区的信道质量；所述第一辅站为在所述终端切换到所述第三态之前，为所述终端提供服务的辅站。
  3. 根据权利要求2所述的通信方法，其特征在于，
    所述第一信息承载于所述第一消息中，所述第一消息具体用于请求恢复所述终端的无线链路控制RRC连接或者用于请求更新所述终端的位置区域；
    所述第二消息用于恢复所述第一主站与所述终端之间的RRC连接。
  4. 根据权利要求1-3中任意一项所述的通信方法，其特征在于，所述为所述终端提供服务的辅站为第一辅站，所述第一辅站为在所述终端切换到所述第三态之前，为所述终端提供服务的辅站，所述第一主站获取SCG的配置信息，具体包括：
    所述第一主站获取所述终端的上下文，所述终端的上下文包括第一终端标识，所述第一终端标识为所述第一辅站在所述第一辅站与第二主站之间的接口为所述终端分配的标识，所述第二主站为在所述终端切换到所述第三态之前，为所述终端提供服务的主站；
    所述第一主站向所述第一辅站发送包括所述第一终端标识的第三消息，所述第三消息用于请求所述第一辅站分配SCG的配置；
    所述第一主站接收来自所述第一辅站的所述SCG的配置信息。
  5. 根据权利要求1-3中任意一项所述的通信方法，其特征在于，所述为所述终端提供服务的辅站为第二辅站，所述第一主站获取SCG的配置信息，具体包括：
    所述第一主站获取所述终端的上下文，所述终端的上下文包括第一配置信息，所述第一配置信息为第一辅站分配的辅小区组SCG的配置，所述第一辅站为在所述终端切换到所述第三态之前，为所述终端提供服务的辅站；
    所述第一主站向所述第二辅站发送包括所述第一配置信息的第三消息，所述第三消息用于请求所述第二辅站分配SCG的配置；
    所述第一主站接收来自所述第二辅站的所述SCG的配置信息。
  6. 根据权利要求1-5中任意一项所述的通信方法，其特征在于，所述通信方法还包括：
    所述第一主站向第二主站发送第一指示信息，所述第一指示信息用于指示所述为所述终端提供服务的辅站是第一辅站，或者，所述第一指示信息用于指示所述为所述终端提供服务的辅站不是第一辅站；所述第二主站为在所述终端切换到所述第三态之前，为所述终端提供服务的主站；所述第一辅站为在所述终端切换到所述第三态之前，为所述终端提供服务的辅站。
  7. 一种通信方法，其特征在于，包括：
    第二主站确定终端的无线资源控制RRC状态从连接态切换为第三态；
    所述第二主站向第一辅站发送挂起指示信息，所述挂起指示信息用于所述第一辅站与所述终端之间的数据传输的挂起；
    所述第二主站接收来自所述第一辅站的第一配置信息，并存储所述第一配置信息，所述第一配置信息包括所述第一辅站为所述终端分配的随机接入资源、用于指示辅小区组SCG承载的配置信息和所述SCG承载的PDCP状态中的至少一个；
    所述第二主站接收来自第一主站的上下文请求消息，所述上下文请求消息用于请求获取所述终端的上下文，所述第一主站为第一小区所属的接入网设备，所述第一小区为所述终端的RRC状态为第三态、且所述终端请求恢复RRC连接所在的小区；
    响应于所述上下文请求消息，所述第二主站向所述第一主站发送所述终端的上下文，所述终端的上下文包括所述第一配置信息和用于指示所述终端的第一终端标识中的至少一个，所述第一终端标识为所述第一辅站在所述第一辅站与所述第二主站之间的接口为所述终端分配的标识。
  8. 根据权利要求7所述的通信方法，其特征在于，所述通信方法还包括：
    所述第二主站确定为所述终端提供服务的辅站；
    在所述为终端提供服务的辅站不是所述第一辅站的情况下，所述第二主站向所述第一辅站发送删除释放指示信息，所述删除释放指示信息用于所述第一辅站中所述第一配置信息的删除，以及所述第一辅站与所述第二主站之间的接口上的所述终端的专用资源的释放；
    在所述为终端提供服务的辅站是所述第一辅站的情况下，所述第二主站向所述第一辅站发送保留释放指示信息，所述保留释放指示信息用于所述第一辅站中所述第一配置信息的保留，以及所述第一辅站与所述第二主站之间的接口上的所述终端的专用 资源的释放。
  9. 根据权利要求8所述的通信方法，其特征在于，所述第二主站确定为所述终端提供服务的辅站，具体包括：
    所述第二主站接收来自所述第一主站的第一指示信息，所述第一指示信息用于指示所述为所述终端提供服务的辅站是所述第一辅站，或者，所述第一指示信息用于指示所述为所述终端提供服务的辅站不是所述第一辅站；
    所述第二主站根据所述第一指示信息，确定所述为所述终端提供服务的辅站。
  10. 一种通信方法，其特征在于，包括：
    第一辅站接收来自第二主站的挂起指示信息，所述挂起指示信息用于所述第一辅站与终端之间的数据传输的挂起；
    所述第一辅站根据所述挂起指示信息，挂起所述第一辅站与所述终端之间的数据传输；
    所述第一辅站向所述第二主站发送包括第一配置信息的挂起响应消息，所述挂起响应消息用于指示所述第一辅站与所述终端的数据传输已被挂起，所述第一配置信息包括所述第一辅站为所述终端分配的随机接入资源、用于指示辅小区组SCG承载的配置信息和所述SCG承载的PDCP状态的至少一个。
  11. 根据权利要求10所述的通信方法，其特征在于，所述通信方法还包括：
    所述第一辅站接收来自所述第二主站的删除释放指示信息，所述删除释放指示信息用于所述第一辅站中所述第一配置信息的删除，以及所述第一辅站与所述第二主站之间的接口上的所述终端的专用资源的释放；
    或者，
    所述第一辅站接收来自所述第二主站的保留释放指示信息，所述保留释放指示信息用于所述第一辅站中所述第一配置信息的保留，以及所述第一辅站与所述第二主站之间的接口上的所述终端的专用资源的释放。
  12. 根据权利要求11所述的通信方法，其特征在于，在所述第一辅站接收来自所述第二主站的保留释放指示信息的情况下，所述通信方法还包括：
    所述第一辅站接收来自第一主站的包括第一终端标识的第一消息，所述第一消息用于请求所述第一辅站的资源配置，所述第一主站为第一小区所属的接入网设备，所述第一小区为所述终端的RRC状态为第三态、且所述终端请求恢复RRC连接所在的小区，所述第一终端标识为所述第一辅站在所述第一辅站与所述第二主站之间的接口为所述终端分配的标识；
    所述第一辅站根据所述第一终端标识，确定所述终端，并为所述终端分配SCG的配置信息，所述SCG的配置信息包括所述第一辅站为所述终端分配的随机接入资源、所述第一辅站中服务小区集合的信息和所述第一辅站的主小区的指示信息中的至少一个；
    所述第一辅站向所述第一主站发送所述SCG的配置信息。
  13. 一种通信方法，其特征在于，包括：
    终端向第一主站发送第一消息，所述第一消息用于请求所述终端从第三态切换到连接态，所述第一主站为第一小区所属的接入网设备，所述第一小区为所述终端的无 线资源控制RRC状态为第三态、且所述终端请求恢复RRC连接所在的小区；
    所述终端接收来自第一主站的第二消息，所述第二消息包括第一安全参数和辅小区组SCG的配置信息；所述第一安全参数用于所述终端与为所述终端提供服务的辅站通信所使用的安全密钥的衍生，所述SCG的配置信息包括所述为所述终端提供服务的辅站为所述终端分配的随机接入资源、所述为所述终端提供服务的辅站中服务小区集合的信息和所述为所述终端提供服务的辅站的主小区的指示信息中的至少一个；
    所述终端根据所述第一安全参数和所述SCG的配置信息，完成与所述为所述终端提供服务的辅站的通信连接。
  14. 根据权利要求13所述的通信方法，其特征在于，所述通信方法还包括：
    所述终端接收来自第二主站的状态切换指示信息，所述状态切换指示信息用于指示所述终端的RRC状态从连接态切换为所述第三态；
    响应于所述状态切换指示信息，所述终端的RRC状态切换为第三态，并存储与第一辅站对应的第一配置信息，所述第一配置信息包括SCG承载的配置信息和SCG承载的PDCP状态的至少一个。
  15. 根据权利要求13或14所述的通信方法，其特征在于，
    所述第一消息包括第一信息，所述第一信息用于所述第一主站确定所述为所述终端提供服务的辅站；其中，所述第一信息包括至少一个测量小区中每个测量小区的信道质量；或者，所述第一信息用于指示所述为所述终端提供服务的辅站是第一辅站；或者，所述第一信息用于指示所述为所述终端提供服务的辅站是第一辅站，以及所述第一辅站中满足预设条件的小区；或者，所述第一信息用于指示所述为所述终端提供服务的辅站是第二辅站；或者，所述第一信息用于指示所述为所述终端提供服务的辅站不是第一辅站，以及第二辅站的标识；或者，所述第一信息用于指示所述为所述终端提供服务的辅站不是第一辅站，以及至少一个测量小区中每个测量小区的信道质量；所述第一辅站为在所述终端切换到所述第三态之前，为所述终端提供服务的辅站。
  16. 一种通信装置，其特征在于，所述通信装置包括处理器，所述处理器用于与存储器耦合，读取并执行所述存储器中的指令，以实现：
    接收来自终端的第一消息，所述第一消息用于请求所述终端从第三态至连接态的切换；
    确定为所述终端提供服务的辅站；
    获取第一安全参数，所述第一安全参数用于所述终端与所述为所述终端提供服务的辅站通信所使用的安全密钥的衍生；
    获取辅小区组SCG的配置信息，所述SCG的配置信息包括所述为所述终端提供服务的辅站为所述终端分配的随机接入资源、所述为所述终端提供服务的辅站中服务小区集合的信息和所述为所述终端提供服务的辅站的主小区的指示信息中的至少一个；
    向所述终端发送第二消息，所述第二消息包括所述第一安全参数和所述SCG的配置信息。
  17. 根据权利要求16所述的通信装置，其特征在于，所述处理器具体用于：
    接收来自所述终端的第一信息，所述第一信息用于所述通信装置确定所述为所述 终端提供服务的辅站；
    根据所述第一信息，确定所述为所述终端提供服务的辅站；
    其中，所述第一信息包括至少一个测量小区中每个测量小区的信道质量；或者，所述第一信息用于指示所述为所述终端提供服务的辅站是第一辅站；或者，所述第一信息用于指示所述为所述终端提供服务的辅站是第一辅站，以及所述第一辅站中满足预设条件的小区；或者，所述第一信息用于指示所述为所述终端提供服务的辅站是第二辅站；或者，所述第一信息用于指示所述为所述终端提供服务的辅站不是第一辅站，以及第二辅站的标识；或者，所述第一信息用于指示所述为所述终端提供服务的辅站不是第一辅站，以及至少一个测量小区中每个测量小区的信道质量；所述第一辅站为在所述终端切换到所述第三态之前，为所述终端提供服务的辅站。
  18. 根据权利要求16或17所述的通信装置，其特征在于，所述为所述终端提供服务的辅站为第一辅站，所述第一辅站为在所述终端切换到所述第三态之前，为所述终端提供服务的辅站，所述处理器具体用于：
    获取所述终端的上下文，所述终端的上下文包括第一终端标识，所述第一终端标识为所述第一辅站在所述第一辅站与第二主站之间的接口为所述终端分配的标识，所述第二主站为在所述终端切换到所述第三态之前，为所述终端提供服务的主站；
    向所述第一辅站发送包括所述第一终端标识的第三消息，所述第三消息用于请求所述第一辅站分配SCG的配置；
    接收来自所述第一辅站的所述SCG的配置信息。
  19. 根据权利要求16或17所述的通信装置，其特征在于，所述为所述终端提供服务的辅站为第二辅站，所述处理器具体用于：
    获取所述终端的上下文，所述终端的上下文包括第一配置信息，所述第一配置信息为第一辅站分配的辅小区组SCG的配置，所述第一辅站为在所述终端切换到所述第三态之前，为所述终端提供服务的辅站；
    向所述第二辅站发送包括所述第一配置信息的第三消息，所述第三消息用于请求所述第二辅站分配SCG的配置；
    接收来自所述第二辅站的所述SCG的配置信息。
  20. 根据权利要求16-19中任意一项所述的通信装置，其特征在于，所述处理器还用于：
    向第二主站发送第一指示信息，所述第一指示信息用于指示所述为所述终端提供服务的辅站是第一辅站，或者，所述第一指示信息用于指示所述为所述终端提供服务的辅站不是第一辅站；所述第二主站为在所述终端切换到所述第三态之前，为所述终端提供服务的主站；所述第一辅站为在所述终端切换到所述第三态之前，为所述终端提供服务的辅站。
  21. 一种通信装置，其特征在于，所述通信装置包括处理器，所述处理器用于与存储器耦合，读取并执行所述存储器中的指令，以实现：
    确定终端的无线资源控制RRC状态从连接态切换为第三态；
    向第一辅站发送挂起指示信息，所述挂起指示信息用于所述第一辅站与所述终端之间的数据传输的挂起；
    接收来自所述第一辅站的第一配置信息，并存储所述第一配置信息，所述第一配置信息包括所述第一辅站为所述终端分配的随机接入资源、用于指示辅小区组SCG承载的配置信息和所述SCG承载的PDCP状态中的至少一个；
    接收来自第一主站的上下文请求消息，所述上下文请求消息用于请求获取所述终端的上下文，所述第一主站为第一小区所属的接入网设备，所述第一小区为所述终端的RRC状态为第三态、且所述终端请求恢复RRC连接所在的小区；
    响应于所述上下文请求消息，向所述第一主站发送所述终端的上下文，所述终端的上下文包括所述第一配置信息和用于指示所述终端的第一终端标识中的至少一个，所述第一终端标识为所述第一辅站在所述第一辅站与所述通信装置之间的接口为所述终端分配的标识。
  22. 根据权利要求21所述的通信装置，其特征在于，所述处理器还用于：
    确定为所述终端提供服务的辅站；
    在所述为终端提供服务的辅站不是所述第一辅站的情况下，向所述第一辅站发送删除释放指示信息，所述删除释放指示信息用于所述第一辅站中所述第一配置信息的删除，以及所述第一辅站与所述通信装置之间的接口上的所述终端的专用资源的释放；
    在所述为终端提供服务的辅站是所述第一辅站的情况下，向所述第一辅站发送保留释放指示信息，所述保留释放指示信息用于所述第一辅站中所述第一配置信息的保留，以及所述第一辅站与所述通信装置之间的接口上的所述终端的专用资源的释放。
  23. 根据权利要求22所述的通信装置，其特征在于，所述处理器具体用于：
    接收来自所述第一主站的第一指示信息，所述第一指示信息用于指示所述为所述终端提供服务的辅站是所述第一辅站，或者，所述第一指示信息用于指示所述为所述终端提供服务的辅站不是所述第一辅站；
    根据所述第一指示信息，确定所述为所述终端提供服务的辅站。
  24. 一种通信装置，其特征在于，所述通信装置包括处理器，所述处理器用于与存储器耦合，读取并执行所述存储器中的指令，以实现：
    接收来自第二主站的挂起指示信息，所述挂起指示信息用于所述通信装置与终端之间的数据传输的挂起；
    根据所述挂起指示信息，挂起所述通信装置与所述终端之间的数据传输；
    向所述第二主站发送包括第一配置信息的挂起响应消息，所述挂起响应消息用于指示所述通信装置与所述终端的数据传输已被挂起，所述第一配置信息包括所述通信装置为所述终端分配的随机接入资源、用于指示辅小区组SCG承载的配置信息和所述SCG承载的PDCP状态的至少一个。
  25. 根据权利要求24所述的通信装置，其特征在于，所述处理器还用于：
    接收来自所述第二主站的删除释放指示信息，所述删除释放指示信息用于所述通信装置中所述第一配置信息的删除，以及所述通信装置与所述第二主站之间的接口上的所述终端的专用资源的释放；
    或者，
    接收来自所述第二主站的保留释放指示信息，所述保留释放指示信息用于所述通信装置中所述第一配置信息的保留，以及所述通信装置与所述第二主站之间的接口上 的所述终端的专用资源的释放。
  26. 根据权利要求25所述的通信装置，其特征在于，在所述通信装置接收来自所述第二主站的保留释放指示信息的情况下，所述处理器还用于：
    接收来自第一主站的包括第一终端标识的第一消息，所述第一消息用于请求所述通信装置的资源配置，所述第一主站为第一小区所属的接入网设备，所述第一小区为所述终端的RRC状态为第三态、且所述终端请求恢复RRC连接所在的小区，所述第一终端标识为所述通信装置在所述通信装置与所述第二主站之间的接口为所述终端分配的标识；
    根据所述第一终端标识，确定所述终端，并为所述终端分配SCG的配置信息，所述SCG的配置信息包括所述通信装置为所述终端分配的随机接入资源、所述通信装置中服务小区集合的信息和所述通信装置的主小区的指示信息中的至少一个；
    向所述第一主站发送所述SCG的配置信息。
  27. 一种通信装置，其特征在于，所述通信装置包括处理器，所述处理器用于与存储器耦合，读取并执行所述存储器中的指令，以实现：
    向第一主站发送第一消息，所述第一消息用于请求所述通信装置从第三态切换到连接态，所述第一主站为第一小区所属的接入网设备，所述第一小区为所述通信装置的无线资源控制RRC状态为第三态、且所述通信装置请求恢复RRC连接所在的小区；
    接收来自第一主站的第二消息，所述第二消息包括第一安全参数和辅小区组SCG的配置信息；所述第一安全参数用于所述通信装置与为所述通信装置提供服务的辅站通信所使用的安全密钥的衍生，所述SCG的配置信息包括所述为所述通信装置提供服务的辅站为所述通信装置分配的随机接入资源、所述为所述通信装置提供服务的辅站中服务小区集合的信息和所述为所述通信装置提供服务的辅站的主小区的指示信息中的至少一个；
    根据所述第一安全参数和所述SCG的配置信息，完成与所述为所述通信装置提供服务的辅站的通信连接。
  28. 根据权利要求27所述的通信装置，其特征在于，所述处理器还用于：
    接收来自第二主站的状态切换指示信息，所述状态切换指示信息用于指示所述通信装置的RRC状态从连接态切换为所述第三态；
    响应于所述状态切换指示信息，所述通信装置的RRC状态切换为第三态，并存储与第一辅站对应的第一配置信息，所述第一配置信息包括SCG承载的配置信息和SCG承载的PDCP状态的至少一个。
  29. 根据权利要求27或28所述的通信装置，其特征在于，
    所述第一消息包括第一信息，所述第一信息用于所述第一主站确定所述为所述通信装置提供服务的辅站；其中，所述第一信息包括至少一个测量小区中每个测量小区的信道质量；或者，所述第一信息用于指示所述为所述通信装置提供服务的辅站是第一辅站；或者，所述第一信息用于指示所述为所述通信装置提供服务的辅站是第一辅站，以及所述第一辅站中满足预设条件的小区；或者，所述第一信息用于指示所述为所述通信装置提供服务的辅站是第二辅站；或者，所述第一信息用于指示所述为所述通信装置提供服务的辅站不是第一辅站，以及第二辅站的标识；或者，所述第一信息 用于指示所述为所述通信装置提供服务的辅站不是第一辅站，以及至少一个测量小区中每个测量小区的信道质量；所述第一辅站为在所述通信装置切换到所述第三态之前，为所述通信装置提供服务的辅站。
  30. 一种计算机可读存储介质，该计算机可读存储介质中存储有指令，其特征在于，当所述指令在通信装置上运行时，使得所述通信装置执行如权利要求1-6中任意一项所述的通信方法，或者执行如权利要求7-9中任意一项所述的通信方法，或者执行如权利要求10-12中任意一项所述的通信方法，或者执行如权利要求13-15中任意一项所述的通信方法。
  31. 一种计算机程序产品，其特征在于，包含指令，当所述指令在通信装置上运行时，使得所述通信装置执行执行如权利要求1-6中任意一项所述的通信方法，或者执行如权利要求7-9中任意一项所述的通信方法，或者执行如权利要求10-12中任意一项所述的通信方法，或者执行如权利要求13-15中任意一项所述的通信方法。
  32. 一种通信系统，其特征在于，所述通信系统包括如上述权利要求16-20中任意一项所述的通信装置、如上述权利要求21-23中任意一项所述的通信装置以及如上述权利要求24-26中任意一项所述的通信装置。
  33. 根据权利要求32所述的通信系统，其特征在于，所述通信系统还包括如上述权利要求27-29中任意一项所述的通信装置。
  34. 一种通信装置，其特征在于，所述通信装置用于执行如权利要求1-6中任意一项所述的通信方法，或者执行如权利要求7-9中任意一项所述的通信方法，或者执行如权利要求10-12中任意一项所述的通信方法，或者执行如权利要求13-15中任意一项所述的通信方法。
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