CN111385830A - Communication method and device - Google Patents

Abstract

According to the communication method, the communication device and the communication system, the first access network equipment sends the first message comprising the identification information of the terminal equipment, the reason for the terminal equipment to initiate the establishment of the Radio Resource Control (RRC) connection and the identification information of the Public Land Mobile Network (PLMN) selected by the terminal equipment to the second access network equipment, and the first access network equipment receives the response message of the first message from the second access network equipment, so that the terminal equipment can be selected to be suitable service access network equipment as soon as possible, and the time delay of the terminal equipment for accessing the network is reduced.

Description

Communication method and device

technical field

The present application relates to the field of communication technologies, and in particular, to a communication method and device that can implement fast handover.

Background technique

In a wireless communication system, such as 5G (also called new wireless), when the serving base station cannot provide the business or network service required by the terminal device, it can send a radio resource control (RRC) release without security protection. message, the RRC release message may be carried on a signaling radio bearer (signaling radio bearer, SRB) 0, for example. After receiving the RRC release message, the terminal device will release the RRC connection with the serving base station, and the terminal device can choose to continue camping on the cell under the serving base station or reselect to another new cell.

However, whether the terminal equipment selects the cell that resides under the serving base station, or the terminal equipment reselects to another new cell and re-initiates the access process in the new cell, the delay of the terminal equipment accessing the network will increase. .

SUMMARY OF THE INVENTION

The communication method provided by the embodiment of the present application can reduce the time delay of the terminal device accessing the network.

To achieve the above object, the embodiments of the present application adopt the following technical solutions:

In a first aspect, a communication method is provided, comprising: a first access network device sending a first message to a second access network device, where the first message includes identification information of a terminal device, a wireless resource initiated by the terminal device The reason for establishing the RRC connection and the identification information of the public land mobile network PLMN selected by the terminal device are controlled; the first access network device receives a response message (first response message) of the first message from the second access network device.

In the communication method, for example, when the first access network device cannot provide the service required by the UE, the first access network device can send the first message to the second access network device through the first access network device, so that the UE can be selected as soon as possible. Appropriate service access network equipment can reduce the delay of terminal equipment accessing the network.

In a possible implementation manner of the first aspect, the first access network device may determine the target access network device (second access network device) according to the measurement report and service information sent by the terminal device. Optionally, the measurement report may be a measurement report, and the service information may include the registered target core network node identification information and/or a single network slice selection support information list. Therefore, the first access network device can determine the target access network device under the condition that the first access network device cannot support the demand of the terminal device, thereby shortening the time delay of the terminal device accessing the network.

In a possible implementation manner of the first aspect, the response message of the first message sent by the second access network device to the first access network device may include the content of the security mode command message and the content of the RRC reconfiguration message, Therefore, when the second access network device allows the terminal device to access, before the terminal device directly sends the access request to the second access network device, the content of the security mode command message can be sent to the second access network device through the first access network device. And the content of the RRC reconfiguration message is transmitted, which shortens the time delay for terminal equipment to access the network.

In a possible implementation manner of the first aspect, the content of the above RRC reconfiguration message is security protection based on the initial key and security algorithm, where the security protection includes integrity protection, or includes integrity protection and encryption protection. Through this implementation manner, the impact on the terminal device is reduced, and in addition, the content of the RRC reconfiguration message is securely protected, so that the authenticity and privacy of the message can be guaranteed.

In a possible implementation manner of the first aspect, the content of the above RRC reconfiguration message is the security protection performed according to the first key and the security algorithm, wherein the first key is based on the initial key from the core network, the source If the information of the cell is determined, the source cell belongs to the first access network device. Optionally, in this implementation manner, the response message of the first message received by the first access network device may further include information of the first key. Through this implementation, the security protection of the content of the RRC reconfiguration message can ensure the authenticity and privacy of the message.

The above-mentioned first key information, the information of the first key includes the first key indication information or the first key, so that the first access network device can transmit the information of the first key to the terminal device, Enables the terminal device to use the correct key for security protection.

In a possible implementation manner of the first aspect, when the terminal device sends a response message of the security mode command message to the first access network device, the first access network device receives the security mode command from the terminal device. The response message (second response message) of the message enables the first access network device to know that the terminal device has activated the security mode or that the activation of the security mode has failed.

In a possible implementation manner of the first aspect, in the case where the second access network device configures the terminal device to send the second response message to the second access network device, the first access network device sends the second response message from the second access network device. The access network device receives the second indication information, the second indication information indicates that the first access network device does not receive the response message of the security mode command message, so that when the terminal device sends the first access network device to the second access network device. During the second response, the energy consumption caused by the first access network device receiving the corresponding message of the security mode command message caused by the inconsistent operation of the terminal device and the first access network device is avoided.

In a possible implementation manner of the first aspect, the above measurement report is an advance measurement report. Optionally, the advance measurement report may be carried in message (message) 3 or message 5, for example.

In a possible implementation manner of the first aspect, in the case of receiving the advance measurement report through the signaling or message before message 4, the advance measurement report to be sent by the terminal device may be determined based on the information of the random access preamble sent by the terminal device. The measurement report is sent, and the uplink grant resource information for transmitting the advance measurement report is sent to the terminal device through message 2. Through this implementation, the terminal device can quickly report the measurement report, so that the serving base station can perform mobility-related configuration more quickly, and the data transmission experience of the terminal device can be improved. It should be noted that this implementation manner can be implemented independently of other implementation manners of the first aspect.

In a second aspect, a communication method is provided, including: a second access network device receiving a first message from a first access network device, and the second access network device sending a first message to the first access network device A response message (first response message), wherein the first message includes the identification information of the terminal device, the reason why the terminal device initiates the establishment of the RRC connection, and the public land mobile network PLMN selected by the terminal device. identification information.

In a possible implementation manner of the second aspect, the above-mentioned first response message may include the content of the security mode command message and the content of the RRC reconfiguration message, so that the second access network device can enable the terminal device to access when the second access network device is allowed to access. In this case, the content of the security mode command message and the content of the RRC reconfiguration message are transmitted in advance to shorten the time delay for the terminal device to access the network.

In a possible implementation manner of the second aspect, the content of the above RRC reconfiguration message is security protection performed according to an initial key and a security algorithm, where the security protection includes integrity protection, or includes integrity protection and encryption protection. Through this implementation manner, the impact on the terminal device is reduced, and in addition, the content of the RRC reconfiguration message is securely protected, so that the authenticity and privacy of the message can be guaranteed.

In a possible implementation manner of the second aspect, the content of the above RRC reconfiguration message is security protection performed according to a first key and a security algorithm, wherein the first key is based on an initial key from the core network, a source If the information of the cell is determined, the source cell belongs to the first access network device. Optionally, in this implementation manner, the response message of the first message received by the first access network device may further include information of the first key. Through this implementation, the security protection of the content of the RRC reconfiguration message can ensure the authenticity and privacy of the message

In a possible implementation manner of the second aspect, the information of the first key includes first key indication information or the first key, so that the first access network device can use the information of the first key Passed to the end device so that the end device can use the correct key for security protection.

In a possible implementation manner of the second aspect, when the second access network device configures the terminal device to send the second response message to the second access network device, the second access network device sends the first response message to the first access network device. The access network device sends second indication information, the second indication information indicates that the first access network device does not receive the second response message, so that when the terminal device sends the second response to the second access network device , to avoid the energy consumption caused by the first access network device receiving the corresponding message of the security mode command message caused by inconsistent operations of the terminal device and the first access network device.

In a possible implementation manner of the second aspect, the second access network device receives the second response message from the terminal device, so that the second access network device knows that the terminal device has activated the security mode or failed to activate the security mode.

In a possible implementation manner of the second aspect, the second access network device receives a third response message, such as an RRC reconfiguration complete message or a handover complete message, from the terminal device, indicating that the RRC reconfiguration is complete and can be switched to the second access network. access equipment.

Optionally, assuming that the content of the RRC reconfiguration message is security protected according to the initial key, the third response message may be security protected according to the initial key, or may be security protected according to the second key, the The second key is determined (derived) based on the initial key and the information of the target cell; assuming that the content of the RRC reconfiguration message is protected according to the first key, the third response message may be based on the third key. The security protection can also be performed according to the above-mentioned second key, and the third key is determined (derived) according to the first key and the information of the target cell. Optionally, the information of the target cell may include, for example, at least one of a physical cell identity (physical cell identity, PCI) of the target cell and frequency point information of the target cell.

In a third aspect, a communication method is provided, comprising: a communication apparatus receiving a security mode command message from a first access network device, wherein the content of the security mode command message is the same as the security mode message determined by the second access network device The contents of the security mode command message include the information of the first key, and the first key is determined according to the initial key determined by the core network and the information of the source cell, wherein the source cell belongs to the the first access network device; sending a response message to the security mode command message, wherein the security mode command response message is security protected according to the first key.

In a possible implementation manner of the third aspect, the information of the first key includes first key indication information or a first key, and the first key indication information is used to indicate that according to the initial key . The information of the source cell determines the first key.

In a possible implementation manner of the third aspect, the communication apparatus sends a second message indicating that the RRC reconfiguration is completed to the second access network device, where the second message is based on the second encryption The second key is for security protection, and the second key is determined according to the first key, the identifier of the target cell, and the frequency point of the target cell, and the target cell belongs to the second access network device.

In a possible implementation manner of the third aspect, the communication apparatus receives first indication information from the first access network device, where the first indication information is used to indicate to the second access network device A response message (second response message) to the security mode command message is sent.

In a possible implementation manner of the third aspect, the communication apparatus may send a response message of the security mode command message to the first access network device.

In a possible implementation manner of the third aspect, the communication apparatus sends an advance measurement report to the first access network device, where the advance measurement report may, for example, carry the radio resource control RRC setup in the random access procedure Request (message 3) or RRC establishment complete message (message 5).

In a possible implementation manner of the third aspect, when the advance measurement report is sent through signaling or a message before message 4, the communication device sends the first receiver through a random access preamble (message 1). The network access device indicates the advance measurement report to be sent; and receives a random access response (message 2) from the first access network device, so as to acquire uplink grant resource information for sending the advance measurement report. It should be noted that, this implementation manner can be implemented independently of other implementation manners of the third aspect.

In a possible implementation manner of the third aspect, the communication apparatus indicates to the first access network device that the advance measurement report is not completely sent, so that the first access network device can learn the advance measurement report Whether the sending is completed so that the corresponding processing can be done.

In a fourth aspect, a communication method is provided, comprising: a first node sending a message to a core network node for delivering non-access stratum signaling of a terminal device to the core network node, and the first node receiving a response from the core network node After the RRC reconfiguration of the terminal device is completed, a message including an initial context establishment response, a session resource identifier and address information for transmitting downlink data of the session resource is sent to the core network node.

Through the communication method, the multi-connection configuration is configured for the terminal device in advance in the process of establishing the initial connection between the first node and the core network node for the terminal device, thereby reducing the signaling overhead between the first node and the core network node.

In a fifth aspect, a communication method is provided, comprising: receiving a message from a first node for delivering non-access stratum signaling of a terminal device to a core network node, sending a response message to the first node, and sending a response message to the first node at the terminal device After the RRC reconfiguration is completed, a message including an initial context establishment response, a session resource identifier and address information for transmitting downlink data of the session resource is received from the first node.

In a sixth aspect, a communication device is provided for implementing the method of the above-mentioned first aspect. The communication device may be the first access network device in the first aspect, or a device including the first access network device, or a component (chip or circuit) configured in the first access network device.

In a seventh aspect, a communication device is provided for implementing the method of the second aspect. The communication device may be the second access network device in the second aspect, or a device including the second access network device, or a component (chip or circuit) configured in the second access network device.

In an eighth aspect, a communication device is provided for implementing the method of the third aspect. The communication device may be a terminal device, or a device including the above-mentioned terminal device, or a component (chip or circuit) configured in the second access network device.

In a ninth aspect, a communication device is provided for implementing the method of the fourth aspect. The communication device may be a first node (access network device), or a device including the above-mentioned first node, or a component (chip or circuit) configured in the first node.

According to a tenth aspect, a communication device is provided for implementing the method of the fifth aspect. The communication device may be a core network node or a device including the above-mentioned core network node, or a component (chip or circuit) configured in the core network node.

The communication device of any one of the sixth to tenth aspects above includes a corresponding module, unit, or means (means) for implementing the above method, and the module, unit, or means can be implemented by hardware, software, or by executing corresponding software by hardware. accomplish. The hardware or software includes one or more modules or units corresponding to the above functions.

In an eleventh aspect, a communication device is provided, comprising: a processor and a memory; the memory is used for storing computer instructions, when the processor executes the instructions, so that the communication device executes the method described in any one of the above aspects .

A twelfth aspect provides a communication device, comprising: a processor; the processor is configured to be coupled to a memory, and after reading an instruction in the memory, execute the method according to any one of the preceding aspects according to the instruction. In a sixth aspect, a computer-readable storage medium is provided, and instructions are stored in the computer-readable storage medium, when the computer-readable storage medium runs on a computer, the computer can perform the method described in any one of the above aspects.

In a thirteenth aspect, there is provided a computer program product comprising instructions which, when executed, cause a communication apparatus to perform the method of any of the preceding aspects.

A fourteenth aspect provides a communication apparatus (for example, the communication apparatus may be a chip or a chip system), the communication apparatus including a processor for implementing the method involved in any of the above aspects. In one possible design, the communication device further includes a memory for storing necessary program instructions and data. When the communication device is a chip system, it may be constituted by a chip, or may include a chip and other discrete devices.

A fifteenth aspect provides a communication system, the communication system includes the communication device of the sixth aspect and the communication device of the seventh aspect, or includes the communication device of the sixth to eighth aspects, or includes the first The communication device of the ninth and tenth aspects.

Description of drawings

FIG. 1 is a schematic structural diagram of a communication system provided by an embodiment of the present application;

FIG. 2 is a schematic structural diagram of an access network device and a terminal device provided by an embodiment of the present application;

3 is a schematic flowchart of a communication method provided by an embodiment of the present application;

FIG. 4 is a schematic flowchart of another communication method provided by an embodiment of the present application;

5 is a schematic flowchart of another communication method provided by an embodiment of the present application;

6 is a schematic flowchart of another communication method provided by an embodiment of the present application;

FIG. 7 is a schematic flowchart of another communication method provided by an embodiment of the present application;

FIG. 8 is a schematic flowchart of another communication method provided by an embodiment of the present application;

FIG. 9 is a schematic structural diagram of a communication device according to an embodiment of the present application;

FIG. 10 is a schematic structural diagram of a communication device according to an embodiment of the present application;

FIG. 11 is a schematic structural diagram of a communication device according to an embodiment of the present application.

Detailed ways

The technical solutions in the embodiments of the present application will be described below with reference to the accompanying drawings in the embodiments of the present application. Wherein, in the description of this application, unless otherwise specified, "/" indicates that the objects associated before and after are an "or" relationship, for example, A/B can indicate A or B; in this application, "and/or" "It is only an association relationship that describes an associated object, which means that there can be three kinds of relationships, for example, A and/or B, which can mean: A alone exists, A and B exist at the same time, and B exists alone, where A exists , B can be singular or plural. Also, in the description of the present application, unless stated otherwise, "plurality" means two or more than two. "At least one item(s) below" or similar expressions thereof refer to any combination of these items, including any combination of single item(s) or plural items(s). For example, at least one (a) of a, b, or c can represent: a, b, c, a-b, a-c, b-c, or a-b-c, where a, b, c may be single or multiple . In addition, in order to clearly describe the technical solutions of the embodiments of the present application, in the embodiments of the present application, words such as "first" and "second" are used to distinguish the same or similar items with basically the same function and effect. Those skilled in the art can understand that the words "first", "second" and the like do not limit the quantity and execution order, and the words "first", "second" and the like are not necessarily different.

In addition, the network architecture and service scenarios described in the embodiments of the present application are for the purpose of illustrating the technical solutions of the embodiments of the present application more clearly, and do not constitute limitations on the technical solutions provided by the embodiments of the present application. With the evolution of the network architecture and the emergence of new service scenarios, the technical solutions provided in the embodiments of the present application are also applicable to similar technical problems.

As shown in FIG. 1 , a communication system 10 is provided in an embodiment of the present application. The communication system 10 includes access network devices 20 and 40 and one or more terminal devices 30 connected to the access network devices 20 and 40 . Take the access network device 20 shown in FIG. 1 interacting with the access network device 40 and interacting with any terminal device 30 as an example. In the embodiment of the present application, the access network device 20 sends a first message to the access network device 40, where the first message includes the identification information of the terminal device 30, the reason why the terminal device 30 initiates the RRC establishment, and the public land selected by the terminal device 30. The identification information of the mobile network, and the access network device 40 sends a corresponding response message to the access network device 20 after receiving the first message. The first message may be, for example, an access request message, which is used to initiate an access request to the access network device 40 , so that the access network device 40 can determine whether to accept the terminal device 30 .

In a possible manner, when the access network device 40 determines to accept the terminal device 30, an acknowledgement response message (a type of response message) may be sent to the access network device 20. Optionally, the confirmation response message may carry the content of the security mode command message and the content of the RRC reconfiguration message. Further, the access network device 20 may forward the content of the security mode command message and the content of the RRC reconfiguration message to the terminal device 30, and the terminal device 30 receives the content of the security mode command (security mode command, SMC) message and the content of the RRC reconfiguration message. After configuring the content of the message, you can perform corresponding operations, such as sending a security mode command complete message to the access network device 20 or 40 and sending an RRC reconfiguration complete message to the access network device 40, which is not limited in this embodiment of the present application . It should be noted that, in this embodiment of the present application, accepting a terminal device is a brief expression of allowing a terminal device to access.

In another possible manner, when the access network device 40 determines not to accept the terminal device 30, it can send a negative response message to the access network device 20, so that the access network device 20 knows that the access network device 40 does not accept the terminal device 30. Terminal equipment 30 is accommodated.

It can be understood that, an access network device 40 is used as an example for description here. Optionally, the access network device 20 may perform similar interactions with multiple access network devices 40, and the response messages sent by different access network devices 40 to the access network device 20 may be different.

Here, the RRC establishment reason may include, for example, at least one of the following: emergency call, high-priority access, passive service, actively triggered signaling service, actively triggered data service, actively triggered voice call, and actively triggered video call , Actively triggered short message service (SMS, short message service), high priority access of multimedia priority service (MPS, Multimedia Priority Service), high priority access of mission-critical service (MCS, mission-critical service), etc. The reason for the establishment of the RRC. It can be understood that the RRC establishment cause may also be referred to as the RRC connection establishment cause.

Optionally, the terminal device can also have a communication connection with multiple access network devices at the same time and can send and receive data, which can be called multi-connectivity (MC), and among the multiple access devices, there can be one The access device is responsible for exchanging radio resource control messages with the terminal device and for interacting with the core network control plane entity. Then, the access device can be called MN, and the other access devices can be called SN.

Optionally, as shown in FIG. 2 , it is a schematic diagram of the hardware structure of the access network device 20 and the terminal device 30 provided in this embodiment of the present application.

Wherein, the terminal device 30 includes at least one processor (in FIG. 2 , it is exemplified that it includes a processor 301 ) and at least one transceiver (in FIG. 2 , it is exemplified that it includes a transceiver 303 ). ). Optionally, the terminal device 30 may further include at least one memory (in FIG. 2 , an example of including a memory 302 is used for illustration), at least one output device (in FIG. 2 , an example of including an output device 304 is used as an example for description). for illustration) and at least one input device (in FIG. 2, it is exemplified that one input device 305 is included for illustration).

The processor 301, the memory 302 and the transceiver 303 are connected by a communication line. A communication link may include any pathway that communicates information between the components described above.

The processor 301 may be a general-purpose central processing unit (CPU), a microprocessor, an application-specific integrated circuit (ASIC), or one or more integrated circuits for controlling the execution of the programs of the present application. circuit. In a specific implementation, as an embodiment, the processor 301 may also include multiple CPUs, and the processor 301 may be a single-core (single-CPU) processor or a multi-core (multi-CPU) processor. A processor herein may refer to one or more devices, circuits, or processing cores for processing data (eg, computer program instructions).

The memory 302 may be a device having a storage function. For example, it may be read-only memory (ROM) or other types of static storage devices that can store static information and instructions, random access memory (RAM), or other types of dynamic storage devices that can store information and instructions The storage device can also be an electrically erasable programmable read-only memory (EEPROM), a compact disc read-only memory (CD-ROM), or other optical disk storage, optical disk storage (including compact disc, laser disc, compact disc, digital versatile disc, blu-ray disc, etc.), magnetic disk storage medium or other magnetic storage device, or capable of carrying or storing desired program code in the form of instructions or data structures and capable of being accessed by a computer any other medium, but not limited to. The memory 302 may exist independently and be connected to the processor 301 through a communication line. The memory 302 may also be integrated with the processor 301 .

The memory 302 is used for storing computer-executed instructions for executing the solution of the present application, and the execution is controlled by the processor 301 . Specifically, the processor 301 is configured to execute the computer-executed instructions stored in the memory 302, thereby implementing the communication method described in the embodiments of the present application. Optionally, the computer-executed instructions in the embodiment of the present application may also be referred to as application program code or computer program code, which is not specifically limited in the embodiment of the present application.

The transceiver 303 can use any transceiver-like device for communicating with other devices or communication networks, such as Ethernet, radio access network (RAN), or wireless local area networks (WLAN), etc. . The transceiver 303 includes a transmitter Tx and a receiver Rx. The transceiver 303 may also be an interface circuit.

The output device 304 communicates with the processor 301 and can display information in a variety of ways. For example, the output device 304 may be a liquid crystal display (LCD), a light emitting diode (LED) display device, a cathode ray tube (CRT) display device, or a projector (projector) Wait.

Input device 305 communicates with processor 301 and can accept user input in a variety of ways. For example, the input device 305 may be a mouse, a keyboard, a touch screen device or a sensing device, or the like.

The access network device 20 includes at least one processor (in FIG. 2 , an example of including a processor 201 is used for illustration), and at least one transceiver (in FIG. 2 , an example of including a transceiver 203 is used for illustration. ) and at least one network interface (in FIG. 2 , it is exemplified that one network interface 204 is included for illustration). Optionally, the access network device 20 may further include at least one memory (in FIG. 2 , it is exemplified that one memory 202 is included for illustration). The processor 201, the memory 202, the transceiver 203 and the network interface 204 are connected through a communication line. The network interface 204 is used to connect with the core network device through a link (such as the S1 interface), or connect with the network interface of other access network devices through a wired or wireless link (such as the X2 interface) (not shown in FIG. 2 ) , which is not specifically limited in the embodiments of the present application.

Optionally, the access network device 20 in the embodiment of the present application is a device that accesses the terminal device 30 to a wireless network, and may be an evolutional NodeB (evolutional NodeB) in long term evolution (long term evolution, LTE). , eNB or eNodeB); or a base station in eLTE; or a fifth generation (5th generation, 5G) network or a base station in a future evolved public land mobile network (public land mobile network, PLMN), a broadband network service gateway (broadband network gateway, BNG), an aggregation switch, or a non-3rd generation partnership project (3rd generation partnership project, 3GPP) access device, etc., which are not specifically limited in this embodiment of the present application. Optionally, the base station in this embodiment of the present application may include various forms of base station, for example: a macro base station, a micro base station (also referred to as a small cell), a relay station, an access point, etc., which are not specifically limited in this embodiment of the present application .

In a network structure, an access network may include a centralized unit (CU) node, or a distributed unit (DU) node, or a RAN device including a CU node and a DU node, or a control plane CU node (CU-CP node) and user plane CU node (CU-UP node) and DU node.

The communication between the access network equipment and the terminal equipment follows a certain protocol layer structure. For example, the control plane protocol layer structure may include a radio resource control (RRC) layer, a packet data convergence protocol (PDCP) layer, a radio link control (RLC) layer, a media interface Access control (media access control, MAC) layer and physical layer and other protocol layer functions. The user plane protocol layer structure may include functions of protocol layers such as the PDCP layer, the RLC layer, the MAC layer, and the physical layer; in one implementation, the PDCP layer may also include a service data adaptation protocol (SDAP) layer. .

The functions of these protocol layers may be implemented by one node, or may be implemented by multiple nodes; for example, in an evolutionary structure, the RAN equipment may include a centralized unit (CU) and a distributed unit (DU), and many Each DU can be centrally controlled by one CU.

The CU and DU can be divided according to the protocol layers of the wireless network. For example, the functions of the PDCP layer and above are set in the CU, and the functions of the protocol layers below PDCP, such as the RLC layer and the MAC layer, are set in the DU. In other words, the CU has functions above the PDCP layer (including PDCP, RRC, and SDAP), and the DU has functions below the PDCP layer (including RLC, MAC, and PHY).

The division of this protocol layer is only an example, and it can also be divided at other protocol layers, for example, at the RLC layer, the functions of the RLC layer and the above protocol layers are set in the CU, and the functions of the protocol layers below the RLC layer are set in the DU; Alternatively, in a certain protocol layer, for example, some functions of the RLC layer and functions of the protocol layers above the RLC layer are placed in the CU, and the remaining functions of the RLC layer and the functions of the protocol layers below the RLC layer are placed in the DU. In addition, it can also be divided in other ways, for example, by time delay, the functions whose processing time needs to meet the delay requirements are set in the DU, and the functions that do not need to meet the delay requirements are set in the CU.

Optionally, the terminal device 30 in this embodiment of the present application may be a device for implementing a wireless communication function, such as a terminal or a chip that can be used in the terminal, and the like. The terminal may be user equipment (UE), access terminal, terminal unit, terminal station, mobile station, mobile station, remote station, remote terminal, mobile device, wireless communication in a 5G network or a future evolved PLMN. equipment, terminal agent or terminal device, etc. The access terminal may be a cellular phone, a cordless phone, a session initiation protocol (SIP) phone, a wireless local loop (WLL) station, a personal digital assistant (PDA), a wireless communication capability handheld devices, computing devices or other processing devices connected to wireless modems, in-vehicle devices or wearable devices, virtual reality (VR) terminal devices, augmented reality (AR) terminal devices, industrial control (industrial control) Wireless terminals in ), wireless terminals in self-driving, wireless terminals in remote medical, wireless terminals in smart grid, wireless terminals in transportation safety , wireless terminals in smart cities, wireless terminals in smart homes, and the like. Terminals can be mobile or stationary.

Optionally, in this embodiment of the present application, the access network device 20 and the terminal device 30 shown in FIG. 1 or FIG. 2 may also be referred to as communication devices, which may be a general-purpose device or a dedicated device, which is implemented in this application. This example is not specifically limited.

In various embodiments of the present application, a beam (beam) may be understood as a space resource, and may refer to a transmit or receive precoding vector with energy transmission directivity. Moreover, the sending or receiving precoding vector can be identified by index information, and the index information may correspond to the resource identifier (identity, ID) of the configured terminal, for example, the index information may correspond to the configured SSB identifier or resource; or It may correspond to the identifier or resource of the configured CSI-RS; it may also be the identifier or resource of the corresponding configured uplink sounding reference signal (sounding reference signal, SRS). Optionally, the index information may also be index information displayed or implicitly borne by a signal or channel borne by the beam. The energy transmission directivity may refer to performing precoding processing on the signal to be sent by using the precoding vector, and the signal subjected to the precoding processing has a certain spatial directivity. The signal has better received power, such as satisfying the signal-to-noise ratio of reception and demodulation; the energy transfer directivity may also mean that the same signal received from different spatial locations through the precoding vector has different received power. Optionally, the same communication device (such as a terminal device or a network device) may have different precoding vectors, and different devices may also have different precoding vectors, that is, corresponding to different beams. According to the configuration or capability of the communication device, one communication device may use one or more of multiple different precoding vectors at the same time, that is, one beam or multiple beams may be formed at the same time.

In each embodiment of the present application, as an implementation manner, the involved message 1-message 4 may correspond to the first message - the fourth message in the competitive random access procedure, and the message may also be abbreviated as MSG . It can be understood that message 1 can also be called message 1, message 2 can also be called message 2, and so on. As another implementation manner, the competitive random access may also be implemented through a two-step process, and the messages included in the competitive random access process of the two-step process may be called message a (the first message) and message b ( The second message), where message a and the previously described message 1 plus message 3 achieve the same function, and message b and the previously described message 2 and message 4 achieve the same function. Therefore, when referring to message 3 in the following embodiments of the present application, it may also refer to other messages having the function of message 3, such as message a. When referring to message 4 in the following embodiments of the present application, it may also be Refers to other messages with the function of message 4, such as message b. In addition, in this embodiment of the present application, the first message sent by the terminal device after the message having the function of message 4 is collectively referred to as message 5. The embodiments of this application do not describe the functions of each message in the competitive random access process in detail.

The communication method provided by the embodiment of the present application will be described below with reference to FIG. 1 and FIG. 2 .

It should be noted that the names of messages between network elements or the names of parameters in the messages in the following embodiments of the present application are just an example, and other names may also be used in specific implementations, which are not specified in the embodiments of the present application. limited.

As shown in FIG. 3 , a communication method provided by an embodiment of the present application includes the following steps:

S301, a terminal device sends a measurement report to a first access network device.

Here, the terminal device may perform signal quality measurement, obtain a signal quality measurement result, and generate a measurement report according to the signal quality measurement result.

It can be understood that the terminal device here may be a terminal device in an idle (idle) or inactive (Inactive) state. The inactive (inactive) state is an RRC state, and may also be referred to as "RRC inactive state" or "inactive state". Similar to the idle state, in the deactivated state, the terminal device disconnects the RRC connection from the network. But different from the idle state, in the deactivated state, the terminal device and the access network device save the context of the terminal. Among them, the access network device that configures the terminal device to enter the deactivated state and stores the context information of the terminal device is generally referred to as the source network device, or the anchor network device. Optionally, for the definition of the deactivated state, reference may be made to the relevant description in 3GPP TS38.300.

The above measurement report may include identification information of at least one cell, or may include identification information of at least one cell and a corresponding signal quality measurement result. Optionally, identification information of at least one beam in the at least one cell may also be included, or identification information of at least one beam in the at least one cell and a corresponding beam measurement result may also be included. The at least one cell may include the cell where the terminal device is currently located and other cells, wherein the other cells here may include other cells belonging to the first network device and/or other cells not belonging to the first network device. The number of other cells may be an integer greater than or equal to 0, which is not limited in this embodiment of the present application. Optionally, the identification information of the at least one cell carried in the measurement report may be the identification information of a cell whose signal quality meets the first preset condition, and the identification information of the at least one beam may be that the signal quality of the beam meets the second preset condition. The identification information of the conditional beam may also be the identification information of all beams belonging to the cell. The first preset condition and the second preset condition may be configured by the access network device, or may be predefined, which are not limited in this embodiment of the present application. The measurement report in this embodiment of the present application may also be referred to as a signal quality measurement report or a signal quality measurement result or other names.

Optionally, for the terminal device in the idle state, a measurement report may be sent to the first access network device through an RRC setup request message (eg, message 3) or an RRC setup complete message (eg, message 5) in the random access process. The first access network device is the access network device where the terminal device is currently located. In a possible manner, the first access network device may also be called a source base station.

Optionally, for the terminal device in the inactive state, a measurement report may be sent to the first access network device through message 3 (or message a). Wherein, the first access network device may be an anchor network device or a non-anchor network device.

In this embodiment of the present application, the measurement report sent through message 3 (or message a) or message 5 may be referred to as an early measurement report (EMR). Of course, EMR can also be sent through other messages or signaling. For example, before the access network device sends a conflict resolution message (message 4 (or message b)), the measurement report and message 3 (or message a) are multiplexed in the same MAC data It is sent in a packet, for example, multiplexed in a MAC service data unit (SDU), or the measurement report and message 3 (or message a) are respectively on different uplink authorized resources before message 4 (or message b). send.

Optionally, including message 3 may include, for example, identification information of the terminal device and an RRC establishment cause, where the identification information of the terminal device may be, for example, initial user equipment identification information (initial UE-Identity). Wherein, the initial user equipment identification information may be, for example, information related to an S-temporary mobile subscriber identity (s-temporary mobile subscriber identity, S-TMSI). When the measurement report is sent through message 3, the measurement report may also be included in message 3.

Optionally, the message 5 may include identification information of the selected public land mobile network (public land mobile network, PLMN). Further, in addition to the selected PLMN identification information, message 5 may also include other information such as the registered target core network node identification information and the list of single network slice selection assistance information (S-NSSAI). The application embodiments do not limit this. In the case of sending the measurement report through the message 5, the measurement report may also be included in the message 5.

It can be understood that the terminal device can also send a measurement report to the first access network device at other times, as long as the first access network device can determine an appropriate target access network device (the second access network device) in advance. ), which is not limited in the embodiments of the present application.

S302, the terminal device sends service information to the first access network device.

The service information here refers to information used to represent the service or network requirements of the terminal device, and optionally, the service information may also be referred to as network information.

In a possible manner, the above-mentioned service information may include the registered target core network node identification information and/or the S-NSSAI list.

For example, in a 5G system, the above-mentioned core network node may be an access and mobility management function (AMF). In an LTE system, the above-mentioned core network node may be, for example, a mobility management entity (mobility management entity, MME).

It can be understood that the above service information may be sent through message 5, or may be sent in other ways, which are not limited in this embodiment of the present application.

It should be noted that S301 and S302 may be executed simultaneously. For example, the measurement report and the service information may be sent to the first access network device through a message (eg, message 5).

In addition, S301 and S302 may not be performed at the same time, that is, the measurement report and service information may be sent to the first access network device through different messages, and the order of S301 and S302 is not limited in this embodiment of the present application.

According to the above measurement report and service information, the first access network device can determine the second access network device.

For example, the first access network device determines whether it can support or meet the requirements of the terminal device according to the service information, so as to determine whether to provide services for the terminal device. If the first access network device determines that it cannot provide services for the terminal device, the second access network device may be further determined according to the measurement report, and S304 and subsequent procedures are performed. It can be understood that, if the first access network device is determined to be able to provide services for the terminal device, it does not need to perform the subsequent procedures in this embodiment of the present application, but selects an appropriate core network for the terminal device according to the service information of the terminal device. node, and provide the business services required by the terminal device. Alternatively, if the first access network device cannot determine a suitable second access network device, the subsequent process in this embodiment of the present application may not be performed, but a reject message or release message may be sent to the terminal device for rejecting the provision of The business service required by the terminal device.

In a possible manner, for the terminal device in the deactivated state, in addition to the service information and the measurement report, the first access network device may further determine the configuration information based on the configuration information of the wireless network area (radio network area, RNA) of the terminal device. The second access network device, for example, preferentially selects the second access network device in the RNA that meets the conditions to provide services for the terminal device.

Wherein, the first access network device cannot support or cannot meet the requirements of the terminal device according to the service information may be:

The first access network device determines that the target core network node is congested or the target core network node does not support access by the terminal device, wherein the target core network node here is identified by the registered target core network node identification information the target core network node; and/or,

The first access network device determines that the slice is not congested or the slice does not support access by the terminal device, where the slice is one or more slices identified by the S-NSSAI list.

Optionally, the first access network device may select an appropriate second access network device according to the measurement report sent in S302, for example, select an access network device whose cell signal quality meets a preset condition as the second access network device. The preset condition here may be, for example, that the signal quality of the cell is greater than or equal to the preset threshold, which is not limited in this embodiment of the present application. Here, the suitable second access network device is the second access network device determined by the first access network device, and it can be understood that there may be more than one second access network device.

It can be understood that S301-S302 are all optional steps, that is to say, instead of determining the second access network device in the above manner, the first message can be sent to any one or more second access network devices. , the process of sending the first message to any one or more second access network devices may also be called blind selection. Optionally, the first network device may determine that it needs to send the first message to any one or more second access network devices according to the service information in S302, or may send the first message to any one or more second access network devices at other times. The second access network device sends the first message, which is not limited in this embodiment of the present application. The second access network device is determined according to the service information and the measurement report, so that the first access network device can determine the target access network device when it cannot support the needs of the terminal device, thereby shortening the time for the terminal device to access the network. delay.

If there are multiple second access network devices, the following processes are respectively executed between the first access network device and each second access network device. A second access network device is used as an example below. In this embodiment of the present application, the second access network device may also be referred to as a target access network device.

S303, the first access network device sends a first message to the second access network device.

Wherein, the first message at least includes the identification information of the terminal device, the RRC establishment reason and the identification information of the public land mobile network PLMN selected by the terminal device. The PLMN identification information selected by the terminal device is provided to the second access network device, so that the second access network device can select the core network node according to the PLMN identification information, and the identification information of the terminal device and the RRC establishment reason can be used for the first access network node. 2. Subsequent interaction between the access network device and the core network node.

The identification information of the terminal equipment, the reason for establishing the RRC, and the identification information of the public land mobile network PLMN selected by the terminal equipment can be obtained from the information sent by the terminal equipment, for example, according to message 3 and message 5 sent by the terminal equipment.

Optionally, the above-mentioned first message may also include one or more of the following information: registered core network identification information, globally unique core network identification type (guami-type, Globally Unique AMF Identifiertype), S-NSSAI list, Private NAS messages. The above information may also be acquired by the first access network device from a message (for example, message5) sent by the terminal device.

In a possible manner, the first message may include part or all of the contents included in message 3 (or message a) and message 5 sent by the terminal device to the first access network device.

Optionally, for a terminal device in an idle state, the identification information of the terminal device may be non-access stratum terminal identification information, such as a temporary mobile subscriber identity (temporary mobile subscriber identity, TMSI) or 5G-TMSI.

Optionally, for a terminal device in an inactive state, the identification information of the terminal device may be an inactive radio network temporary identity (I-RNTI) in an inactive state.

S304, the second access network device sends a response message of the first message to the first access network device.

Correspondingly, the first access network device receives a response message to the first message from the second access network device. The response message may also be referred to as a first response message.

Here, after receiving the first message, the second access network device may determine whether to allow the terminal device to access according to factors such as network load conditions or base station functions, so as to send a corresponding first response to the first access network device information. It should be noted that this embodiment of the present application does not limit the manner in which the second access network device determines whether to allow the terminal device to access.

In a possible manner, when the second access network device determines to accept the terminal device, a confirmation response message (an example of the first response message) may be sent to the first access network device. Optionally, the confirmation response message may include the content of the security mode command message and the content of the RRC reconfiguration message. It can be understood that the content of the security mode command message and the content of the RRC reconfiguration message may be included in the same acknowledgement response message, or may be included in different acknowledgement response messages. Here, the RRC reconfiguration message may also be called a handover message, and the name of the message is not limited in this embodiment of the present application. The content of the security mode command message is used to activate the access layer security of the terminal device, and the content of the RRC reconfiguration message is used to switch the terminal device to the target cell. It can be understood that the target cell belongs to the second access network device. 's district. It can be understood that the content of the security mode command message may also be referred to as security mode command information, and the content of the RRC reconfiguration message may also be referred to as RRC reconfiguration information. Before the terminal device directly sends the access request to the second access network device, the first access network device transmits the content of the security mode command message and the content of the RRC reconfiguration message to shorten the delay of the terminal device accessing the network . It can be understood that the content of the security mode command message and the content of the RRC reconfiguration message may also be sent to the first access network device through different messages.

As an implementation manner, the content of the security mode command message and the content of the RRC reconfiguration message are contained in the packet data convergence protocol control protocol data unit (PDCP-C PDU) in the form of an encapsulated packet data convergence protocol control protocol data unit (PDCP-C PDU). Acknowledgment in the reply message. Optionally, when the second access network device encapsulates the content of the security mode command message, it may not perform any security protection, or may only perform integrity protection; when the second access network device encapsulates the content of the RRC reconfiguration message, it may Integrity protection may be performed, or both integrity protection and encryption protection may be performed. In this embodiment of the present application, the security protection includes integrity protection, or includes integrity protection and encryption protection.

In another possible manner, when the second access network device determines not to accept the terminal device, it may send negative acknowledgement information (another example of the first response message) to the first access network device, so that The first access network device learns that the second access network device does not accept the terminal device.

Optionally, in this embodiment of the present application, the following steps may also be included:

S305, the first access network device sends the content in the received first response message to the terminal device.

In this step, the first access network device sends the content of the security mode command message and the content of the RRC reconfiguration message to the terminal device. For example, the first access network device transparently transmits the security mode command message and the RRC reconfiguration message to the terminal device. The content of the security mode command message and the content of the RRC reconfiguration message may be sent to the terminal device through one message, or may be sent to the terminal device through different messages at different timings. For example, the content of the security mode command message may be sent to the terminal device through a security mode command message (SMC), and the content of the RRC reconfiguration message may be sent to the terminal device through an RRC reconfiguration message. It can be understood that the terminal device may send a response message to the first access network device after receiving the content of the security mode command message transmitted by the first access network device. Or, after receiving the content of the security mode command message, the terminal device will send a response message to the first access network device or the second access network device according to the corresponding indication information. Optionally, if the first access network device receives the response message sent by the terminal device, the first access network device forwards the second response message to the second access network device. In addition, after receiving the content of the RRC reconfiguration complete message transmitted by the first access network device, the terminal device will send a response message to the second access network device. Regarding the response message mentioned in this embodiment, reference may be made to the description of the embodiment in FIG. 4 in detail.

In this embodiment of the present application, the first access network device sends the first message to the second access network device, so that a suitable service access network device can be selected for the terminal device as soon as possible, and the time for the terminal device to access the network can be reduced. extension.

It can be understood that, for the content of the RRC reconfiguration message in the response message of the first message sent by the second access network device, there may be different security mechanisms, which will be described in detail below.

As shown in FIG. 4 , an embodiment of the present application further provides a communication method, and the method may include:

S401, a terminal device sends a measurement report to a first access network device.

S402, the terminal device sends service information to the first access network device.

S403, the first access network device sends a first message to the second access network device.

For the implementation manner and specific description of S401-S403, reference may be made to the relevant descriptions at S301-S303, which will not be repeated here.

S404, the second access network device sends a first response message to the first access network device.

Taking the second access network device determining to accept the terminal device as an example, the first response message includes the content of the security mode command message and the content of the RRC reconfiguration message. It can be understood that the content of the security mode command message and the content of the RRC reconfiguration message may be included in the same acknowledgement response message, or may be included in different acknowledgement response messages.

In a possible manner, the content of the RRC reconfiguration message may be secured according to the initial key and a certain security algorithm (which may be referred to as the first security algorithm). In this way, the impact on the terminal equipment can be reduced, and in addition, the content of the RRC reconfiguration message can be safely protected so that the authenticity and privacy of the message can be guaranteed.

The initial key may be from the core network device, for example, the core network device determines the initial key and sends it to the second access network device.

Optionally, the first security algorithm includes an integrity protection algorithm, or the first security algorithm includes an integrity protection algorithm and an encryption algorithm. In a possible manner, the first security algorithm may be determined by the second access network device. For example, the second access network device may select an algorithm with a higher priority among the security algorithms supported by the second access network device as the first security algorithm. The embodiments of the present application do not limit how to determine the first security algorithm and the specific security algorithm.

In addition, the content of the security mode command message may include the information of the first security algorithm, so that the terminal device can know what security algorithm is used in the content of the RRC reconfiguration information. It should be noted that, the information of the first security algorithm may also be sent to the first access network device through other messages or signaling, which is not limited in this embodiment of the present application.

In another possible manner, the content of the RRC reconfiguration message may be security protection performed according to a first key and a first security algorithm, where the first key is determined according to the initial key and information of the source cell. Optionally, the information of the source cell may include at least one of a physical cell identifier of the source cell and a frequency point of the source cell. The source cell is a cell that belongs to the first access network device and initiates an access request for the terminal device. The process of determining the first key according to the initial key and the information of the source cell may also be referred to as key derivation. In this manner, the security protection of the content of the RRC reconfiguration message can ensure the authenticity and privacy of the message.

Optionally, when the content of the RRC reconfiguration message is to perform security protection according to the first key, the second access network device may send the information of the first key to the first access network device, for example The information of the first key may be included in the content of the security mode message in the first response message. By including the information of the first key in the content of the security mode message, the terminal device can know that the content of the RRC reconfiguration message is secured according to the first key. The information of the first key may be the first key itself, or may be indication information of the first key (indicating the use of the first key). In the case that the information of the first key is the indication information of the first key, the terminal device may derive the first key according to the initial key and the information of the source cell. This embodiment of the present application does not limit the manner in which the second access network device sends the information of the first key to the first access network device.

S405, the first access network device sends the content of the above security mode command message to the terminal device.

Correspondingly, the terminal device receives the content of the above security mode command message.

In a possible manner, the first access network device may forward the content of the security mode command message sent by the second access network device to the terminal device through the security mode command message. Here, the content of the security mode command message sent by the first access network device to the terminal device is the same as the content of the security mode command message sent by the second access network device to the first access network device.

In a possible manner, the first access network device transparently forwards the security mode command message received from the second access network device.

S406, the terminal device sends a second response message.

The terminal device may send the second response message to the first access network device, or may send the second response message to the second access network device. Optionally, the terminal device may send a second response message to the first access network device after receiving the content of the security mode command message transmitted by the first access network device. Alternatively, the terminal device may determine whether to send the second response message to the first access network device or to send the second response message to the second access network device according to the first indication information from the second access network device. The first indication information may be forwarded to the terminal device through the first access network device. For example, the content of the security mode command message in the first response message may include first indication information, where the first indication information is used to instruct the terminal device to send the second response message to the second access network device. It can be understood that, if the first response message does not include the first indication information, the terminal device sends the second response message to the first access network device by default. In addition, the first indication information may also indicate to send the second response message to the first access network device. If the first response message does not include the first indication information, the terminal device sends the second response message to the second access network device by default. 2. Response message. This embodiment of the present application does not limit how the first indication information specifically indicates, as long as the terminal device can determine whether to send the second response message to the first access network device or the second access network device.

It can be understood that, when the second access network device instructs the terminal device to send the second response message to the second access network device, the second access network device may also send the second response message to the first access network device. indication information, where the second indication information indicates that the first access network device does not receive the second response message. Through the second indication information, when the terminal device sends the second response to the second access network device, it can prevent the first access network device from receiving the security mode command message caused by inconsistent operations between the terminal device and the first access network device The energy consumption brought by the corresponding message. It should be noted that, the first indication information and the second indication information may be sent in the same message, or may be sent in different messages, which is not limited in this embodiment of the present application.

In a possible manner, the terminal device correctly receives the content of the security mode command message, and sends a second response message to the first access network device or the second access network device according to the content of the security mode command message, so that The first access network device or the second access network device learns that the terminal device has activated the security mode. The second response message may be, for example, a secure mode complete message.

In a possible manner, when the terminal device cannot activate the security mode according to the content of the security mode command message, the terminal device sends a second response message, so that the first access network device or the second access network device knows the terminal The device failed to activate safe mode. The second response message may be, for example, a safe mode failure message.

Further, if the terminal device sends the second response message to the first access network device, the method shown in FIG. 4 may further include: the first access network device forwards the second response message to the second access network device. For example, when the first access network device receives the second response message sent by the terminal device, the first access network device forwards the second response message to the second access network device.

It can be understood that, according to the security mechanism of the content of the RRC reconfiguration message sent by the second access network device, and the sending object (the first access network device or the second access network device) of the second response message, the second The response message has corresponding security mechanisms:

For example, assuming that the content of the RRC reconfiguration message sent by the second access network device is secured according to the initial key and the first security algorithm, and the second response message is sent to the first access network device, then the first The second response message can also be security protected according to the above initial key and the first security algorithm; or, it is assumed that the content of the RRC reconfiguration message sent by the second access network device is security protected according to the initial key and the first security algorithm , and the second response message is sent to the second access network device, then the second response message can be protected according to the same security mechanism as the third response message. For details, please refer to the following section on the security mechanism of the third response message. describe;

Or, assuming that the content of the RRC reconfiguration message sent by the second access network device is secured according to the first key and the first security algorithm, and the second response message is sent to the first access network device, then The second response message can also be secured according to the first key and the first security algorithm; or, it is assumed that the content of the RRC reconfiguration message sent by the second access network device is secured according to the first key and the first security algorithm protected, and the second response message is sent to the second access network device, then the second response message can be protected according to the same security mechanism as the third response message. For details, please refer to the following for the security of the third response message. Description of the mechanism. It can be seen that in the case that the second response message is sent to the first access network device, the second response message may be security protected according to the same security mechanism as the content of the RRC reconfiguration message described in S404, In the case that the second response message is sent to the second access network device, the second response message can be secured according to the same security mechanism as the third response message.

On the basis of the above process, the method shown in FIG. 4 may further include the following steps:

S407, the first access network device sends the content of the RRC reconfiguration message to the terminal device.

Correspondingly, the terminal receives the content of the RRC reconfiguration message. Here, the content of the RRC reconfiguration message sent by the first access network device to the terminal device is the same as the content of the RRC reconfiguration message sent by the second access network device to the first access network device.

In a possible manner, the first access network device may transparently forward the content of the RRC reconfiguration message sent by the second access network device to the terminal device through the RRC reconfiguration message.

S408, the terminal device sends a third response message to the second access network device.

In the case that the RRC reconfiguration can be successfully completed, the terminal device may send a third response message (also referred to as a second message) to the second access network device. Optionally, if the RRC reconfiguration is not successfully completed, the terminal device may enter an idle state. It is understandable that the terminal device does not need to perform S408 at this time.

In a possible manner, the third response message may be an RRC reconfiguration complete message or a handover complete message.

It can be understood that the third response message can also be protected according to a certain security mechanism:

For example, assuming that the content of the RRC reconfiguration message described in S404 is secured according to the initial key, the third response message may be secured according to the initial key, or may be secured according to the second key protection, the second key is determined (derived) based on the initial key and the information of the target cell; assuming that the content of the RRC reconfiguration message described in S404 is protected according to the first key, then the third key The response message may be security protected according to a third key, or may be security protected according to the above-mentioned first key, where the third key is determined (derived) according to the first key and information of the target cell. Optionally, the information of the target cell may include, for example, at least one of a physical cell identity (physical cell identity, PCI) of the target cell and frequency point information of the target cell. The target cell is a cell belonging to the second access network device. In a possible manner, the terminal device may acquire the information of the target cell from the content of the RRC reconfiguration message.

It should be noted that S405 and S407 can also be executed simultaneously, for example, the content of the security mode command message and the content of the RRC reconfiguration message are sent to the terminal device in one message; S407 can also be executed after S405, or S407 It may also be executed before S405, which is not limited in this embodiment of the present application.

In the communication method shown in the embodiment of FIG. 4, through the above-mentioned security mechanism, the second access network device can safely activate and reconfigure the terminal device through the first access network device, so that the terminal device can be transferred from the first access network device to the terminal device as soon as possible. The network access device is switched to the second access network device to reduce the delay of the terminal device accessing the network.

For the manner in which the terminal device sends an advance measurement report before message 4, an embodiment of the present application provides a communication method, as shown in FIG. 5 , including:

S501. Receive random access resource configuration information of an advance measurement report from an access network device.

Optionally, in this embodiment of the present application, the configuration information of the random access resource may be any combination of random access preamble information, random access time domain resource information, or random access frequency domain resource information.

For example, the configuration information of random access resources may include random access preamble information; or, the configuration information of random access resources may include random access time domain resource information; or, the configuration information of random access resources may include random access resources. input frequency domain resource information; or, the configuration information of random access resources may include random access preamble information on random access frequency domain resources, that is to say, the configuration information of random access resources includes random access frequency resource information and random access preamble information; or, the configuration information of random access resources may include random access preamble information on random access time domain resources, that is to say, the configuration information of random access resources includes random access time domain information. domain resource information and random access preamble information; or, the configuration information of random access resources may include random access time domain resources and random access preambles on random access frequency domain resources, that is, random access resources The configuration information includes random access time domain resource information, random access frequency resource information and random access preamble information. Optionally, in this embodiment of the present application, the random access time domain resource information may include, for example, an identifier of the random access time domain resource or the configuration of the random access time domain resource, where the configuration of the random access time domain resource may, for example, be Including the configuration of frame, symbol, slot, etc.

Optionally, in this embodiment of the present application, the random access frequency domain resource information may include, for example, an identifier of the random access frequency domain resource or a configuration of the random access frequency domain resource. The configuration of the random access frequency domain resources may include, for example, configurations of bandwidth, resource blocks, and the like.

Optionally, in this embodiment of the present application, the random access preamble information may include, for example, an identifier of the random access preamble or a configuration used to determine the random access preamble. The configuration of the random access preamble may include, for example, a preamble.

It can be understood that S501 is an optional step, that is to say, the access network device may not need to send the random access resource configuration information of the advance measurement report, and the advance measurement report may correspond to a predefined random access resource.

S502, the terminal device sends a random access preamble (preamble) to the access network device.

It can be understood that sending the preamble by the terminal device to the access network device may also be referred to as sending message 1 (message 1), and correspondingly, the access network device receives the random access preamble sent by the terminal device. When the terminal device has an advance measurement report to send, the terminal device may send the random access preamble according to the random access resource corresponding to the random access resource configuration information described in S501.

S503, the access network device determines whether the terminal device has an advance measurement report to be sent according to the information of the random access preamble.

Here, the information of the random access preamble may be any one or more of the following: the random access preamble itself, the time domain resource information used for sending the random access preamble, and the information used for sending the random access preamble frequency domain resource information. If the access network device learns that the random access preamble information is consistent with the random access resources configured by the access network device or pre-defined in the advance measurement report, the access network device determines that the terminal device has to send Advance measurement report, go to S503; if the access network device learns that the information of the random access preamble does not match the random access resource configured by the access network device or the pre-defined advance measurement report, then the access network device determines that the If the terminal device has no advance measurement report to be sent, it will be processed according to the normal process. Wherein, the information of the random access preamble and the random access resource configured by the access network device or the pre-defined measurement report in advance may be the information of the random access preamble, which belongs to the random access resource configured by the access network device or pre-defined. The random access resource information corresponding to the configuration information of the access resource.

S504, the access network device sends the uplink scheduling information of the advance measurement report to the terminal device.

In a possible manner, the access network device may send the uplink scheduling of the advance measurement report, such as uplink grant (uplink grant) resource information, to the terminal device through a random access response (message 2). It can be understood that, message 2 may not only include the uplink scheduling information of the advance measurement report, but optionally, may also include the uplink scheduling information of message 3. The uplink scheduling information of the advance measurement report and the uplink scheduling information of message 3 may be the same or different. For example, message 2 includes two uplink scheduling information, grant 1, grant 2, and grant 3. Grant 1 can be used to send message 3, and grant 2 can be used to send an advance measurement report.

S505, the terminal device reports a measurement report to the access network device in advance.

After receiving the uplink scheduling information sent by the access network device, the terminal device sends an advance measurement report to the access network device while sending message 3 (which can also be understood as accompanied by message 3) according to the uplink scheduling information, or, immediately. An advance measurement report is sent with message 3.

In a possible manner, the advance measurement report and message 3 can be multiplexed and sent in the same MAC data packet, such as a MAC service data unit (SDU), or the measurement report and message 3 are respectively before message 4. It is sent on different uplink grant resources; or, the advance measurement report is included in message 3. Optionally, if all the advance measurement reports to be sent are not sent according to the uplink scheduling information, the method may further include:

S506, indicating to the access network device that the advance measurement report is not completely sent.

After the terminal device sends the advance measurement report according to the uplink scheduling information configured in S504, if the terminal device finds that the configured uplink scheduling information is insufficient, it sends the advance measurement report completely, that is to say, the terminal device cannot send the advance measurement report all at once. , the terminal device may indicate to the access network device that the advanced measurement report has not been sent completely. It can be understood that the information indicating that the advance measurement report has not been sent completely can be implemented in different ways: for example, the indication information indicates whether the advance measurement report has been sent completely, which can be indicated by 1 bit information (for example, "0" indicates that The advance measurement report is completely sent, "1" indicates that the advance measurement report has not been sent completely); or, the corresponding indication information can be sent only when the advance measurement report has not been sent completely. The report is sent completely; alternatively, the corresponding indication information may be sent only when the advance measurement report is sent completely. If there is no corresponding indication information, it means that the advance measurement report is not sent completely.

Optionally, the above-mentioned indication information may be sent through the physical uplink control channel, or may be carried in the advance measurement report, which is not limited in this embodiment of the present application, as long as the access network device can be informed whether the advance measurement report has been sent completely, thereby. You can deal with it accordingly.

It should be noted that, the communication method of the embodiment shown in FIG. 5 can be applied to terminal equipment in an inactive state, a terminal equipment in an idle state, or a terminal equipment in which a wireless link is re-established, no matter what In all scenarios, the advance measurement report can be sent according to a communication method similar to that shown in FIG. 5 .

It can be understood that the communication method shown in FIG. 5 may be independent of any other embodiment of the present application, and may also be combined with other embodiments of the present application. For example, the communication method shown in FIG. 5 can be combined with the communication method shown in FIG. 3 or FIG. 4 to be used for sending the advance measurement report of the communication method shown in FIG. 3 or FIG. 4 . In this case, the communication method shown in FIG. 5 The access network device is the first access network device.

The communication method of the embodiment shown in FIG. 5 enables the terminal device to quickly report the measurement report, so that the serving base station can perform mobility-related configuration more quickly, thereby improving the data transmission experience of the terminal device.

An embodiment of the present application also provides a communication method, as shown in FIG. 6 , which may include:

S601, the first node sends a message A to a core network node.

Here, the first node may also be referred to as a first base station or a master base station or a master node (MN). The core network node may be, for example, an AMF or an MME. The message A is a message used to send the non-access stratum signaling of the terminal device to the core network node, for example, it may be an initial UE message (initial UE message).

Optionally, before S601, it may further include: the terminal device sends information indicating that there is a measurement report to the first node.

S602, the core network node sends a message B to the first node.

Here, the message B is used to establish the connection configuration between the first node and the core network node for the terminal device, for example, it may be an initial context setup request (initial context setup requset).

In the prior art, the first node will send a response message of message B to the core network node, for example, an initial context setup response (initial context setup response). In this embodiment of the present application, after S602, the response of message B is not sent immediately message, but is sent after being merged with other message content in the subsequent process.

S603, the terminal device sends a measurement report to the first node.

Regarding the measurement report, reference may be made to the relevant description at S301, and details are not repeated here.

It can be understood that, before S603, it may also include a process of security mode interaction between the first node and the terminal device: the first node sends a security mode command to the terminal device, and after activating the security mode, the terminal device sends a security mode command to the first node. Send safe mode complete message.

It can be understood that the sequence of S603 and S601 and S602 is only an example, which is not limited in this embodiment of the present application. S603 may precede S601, or S603 may follow S601 and precede S602.

S604, the first node sends a request for adding the second node to provide services for the terminal device to the second node.

Here, the second node may also be referred to as a second base station or a secondary base station or a secondary node (SN). Optionally, the request for adding the second node to provide services for the terminal device may be, for example, a secondary node addition request (S-Node addition request). The request sent by the first node to the second node is used to request the second node to allocate resources for the multi-connection operation to the terminal device. In a possible manner, the first node may determine and add the second node according to the measurement report, or may determine and add the second node in other manners.

S605, the second node sends a response to the first node.

Wherein, the second node sends a response to the first node based on the request of the first node,

In a possible manner, the response sent by the second node to the first node may be, for example, a secondary node addition request response (S-Node addition request response), which is used to inform the first node that the second node can provide the terminal device. Serve. The response sent by the second node to the first node may include resource configuration information allocated to the terminal device by the second node for the multi-connection operation.

In a possible manner, for example, when the second node cannot provide the required bearer or service, the response sent by the second node to the first node may be, for example, a S-Node addition request reject, using In order to make the first node know that the second node cannot provide services for the terminal device. .

S606, the first node sends a message C to the terminal device.

The message C is used for RRC reconfiguration, for example, it may be called an RRC reconfiguration message.

Optionally, the message C may include configuration information of the second node, which is used by the terminal device to establish a connection with the second node.

After the terminal device receives the message C, the terminal device establishes a connection with the second node according to the configuration information of the second node carried in the message C.

S607, the terminal device sends a response message of the message C to the first node.

Correspondingly, the first node receives a response message of the message C sent by the terminal device, where the response message is used to notify the first node that the terminal device has completed the corresponding configuration according to the message C.

In a possible manner, the response message of message C may be an RRC reconfiguration complete message.

S608, the first node sends the message D to the core network node.

Correspondingly, the core network node receives the message D. The message D may include the initial contextsetup response in the prior art, the session resource identifier and the corresponding address information for transmitting the downlink data of the session resource.

In the embodiment of the present application, by configuring the multi-connection configuration for the terminal device in advance in the process of establishing the initial connection between the first node and the core network node for the terminal device, the signaling overhead between the first node and the core network node is reduced.

Another embodiment of the present application also provides a communication method, as shown in FIG. 7 , including:

S701. The terminal device A sends an advance measurement report to the access network device A.

For the content and sending manner of the advance measurement report, reference may be made to the relevant descriptions of the foregoing embodiments.

Wherein, the terminal device may be a terminal device in a deactivated state or a terminal device in a process of recovering from a radio link failure. The access network device A may also be referred to as a third access network device or a target access network device.

S702, the access network device A sends a message E to the access network device B, requesting to acquire the context of the terminal device.

After the access network device A obtains the pre-measurement report, it determines whether to request to obtain the context of the terminal device A. For example, the access device A can determine to replace the access network device according to the cell load or other factors, and select the appropriate target connection according to the measurement report. The network access device, if it can find a suitable target access network device, requests to obtain the context of the terminal device.

Optionally, the target access network device may be the same access network device as access network device A, or the target access network device may be the same access network device as access network device B, or the target access network device may be the same access network device as access network device B. The network access device is an access network device different from the access network device A and the access network device B.

If the target access network device is the same access network device as access network device B: while requesting to acquire the context of the terminal device, access network device A will also send a target to access network device B The identification information of the cell, optionally, the measurement result related to the access network device B may also be sent to the access network device.

The access network device B is the access network device that stores the context of the terminal device A. For example, for terminal device A in the deactivated state, access network device B may be the access network device that configures terminal device A to enter the deactivated state, and access network device B may also be referred to as the source access network device or the anchor access network device. Access network equipment; or, for terminal equipment in the process of wireless link failure recovery, access network equipment B may be the access network equipment where terminal equipment A is located when the wireless link failure occurs, and access network equipment B may also be called is the source access network device.

Optionally, the access network device B may also be referred to as the fourth access network device.

In a possible manner, the message E may be a request for obtaining a user equipment context (retrieval UEcontext request) message, requesting to obtain the context of the terminal device. Message E may also be referred to as a third message.

S703: The access network device B sends a next hop chainingcounter (next hop chainingcounter, NCC) to the access network device A.

In different scenarios, the NCC sent by access network device B is different:

(1) For the scenario in the deactivated state, the NCC sent by the access network device B to the access network device A is the same as the NCC sent to the terminal device when the access network device B configures the terminal device to enter the deactivated state. For example, the NCC sent by the access network device B to the access network device A may be the NCC carried in the RRC release message in which the access network device B configures the terminal device to enter the deactivated state.

(2) For the scenario where the wireless link fails to recover, the NCC fed back by the access network device B to the access network device A may be the NCC used by the terminal device A in the access network device B or the NCC used by the terminal device A in the access network device A. The NCC not used by the device B (may also be referred to as the NCC not used by the terminal device). For example, if there is an NCC that is not used by the terminal device A in the access network device B, the access network device B feeds back the NCC that is not used by the terminal device A to the access network device A. There is no NCC that is not used by the terminal device A, and the access network device B feeds back the NCC used by the terminal device A in the access network device B to the access network device A. It can be understood that the NCC used by the terminal device A in the access network device B is configured by the access network device B to the terminal device A. It should be noted that in this scenario, the access network device B may not send the NCC to the access network device B based on the request of the access network device A, but may send the NCC to the access network device A in advance. In this case, S702 may not be executed. Optionally, when the access network device sends the NCC to the access network device A in advance, the execution order of S701 and S703 is not limited, for example, S703 may also be executed before S701.

In a possible manner, the access network device B may send the NCC to the access network device A in the response message for obtaining the terminal device context request. It can be understood that this embodiment of the present application does not limit the name of the message to send the NCC.

Optionally, the access network device B may also send a key A to the access network device A, where the key A may be based on the key used by the terminal device A when the access network device A initiates an access request Or the key corresponding to the terminal device A stored in the access network device B. The information of the cell where the terminal device A initiates the access request (the cell is a cell belonging to the access network device A) includes at least one of the following: a physical cell identifier and frequency point information of the cell.

S704, the access network device A sends a handover request to the target access network device.

S705, the target access network device returns a handover response to the access network device A.

Wherein, through S704 and S705, the handover preparation is completed. It should be noted that S704 and S705 are optional steps, that is to say, S704 and S705 may not be executed or there is no S704 and S705, then S706 is executed after S703. For example, when the target access network device is the same access network device as the access network device A or the access network device B, S704 and S705 do not need to be performed.

S706, the access network device A sends message 4 to the terminal device A.

Wherein, the message 4 includes target cell information. The target cell information includes at least one of the following: a physical cell identifier of the target cell, and frequency point information of the target cell. Optionally, the message 4 may further include the reserved non-contention random access resource configuration information of the target cell. Further, message 4 may also include information for determining the key B and/or a second security algorithm. The information for determining the key B may include the NCC. Optionally, the NCC may be the NCC received by the access network device A from the access network device B. The second security algorithm may be the security algorithm received by the access network device A from the target access network device. It can be understood that the message 4 may not include the information and/or the security algorithm for the key B. In this case, the terminal device A uses the relevant information in the saved context by default.

S707, the terminal device A sends a fourth message to the target access device.

Wherein, the fourth message is used to access the target access device. Optionally, the fourth message may be, for example, an RRC recovery complete message or an RRC reconfiguration complete message. In a possible way, the fourth message can be protected by using the key B (also called a new key) for example. The key B may be determined according to the key A, the NCC and the information of the target cell.

In the embodiment of the present application, in the process of connection recovery or re-establishment of the terminal device, a suitable target access network device is determined for the terminal device in time, so as to better provide services for the terminal device.

The embodiment of the present application also provides a communication method, as shown in FIG. 8 , which may include:

S801, the terminal device A sends an advance measurement report to the access network device A.

S802, the access network device A sends a fifth message to the access network device B.

Wherein, the fifth message may carry part or all of the content of the advance measurement report received by the access network device A from the terminal device A.

Alternatively, the fifth message may carry information of the target access network device and/or the target cell, which is used by the access network device B to identify the target access network device and/or the target cell.

S803, the access network device B sends a sixth message to the target access network device.

Wherein, the sixth message is a message for realizing the handover request.

The target access network device may be determined by access network device B according to part or all of the content of the advance measurement report received from access network device A; or, the target access network device may be determined by access network device A and sent to the receiving Network access device B's.

Wherein, the sixth message carries the target key (the key used in the communication between the terminal device A and the target cell). Optionally, the sixth message may further include information of the target cell, and may further include the measurement result of the target cell.

As an implementation manner, the method for determining the target key is as follows: the access network device B uses the old key when the terminal device A and the access network device B perform service transmission and the cell where the terminal device A initiates the access request (the cell is the cell belonging to the access network device A) information to determine the first key; then the access network device B determines the target key according to the first key and the target cell information.

Optionally, the sixth message may further include the target NCC (the NCC used in the communication between the terminal device A and the target cell).

S804, the target access network device replies to the access network device B a response of the sixth message.

The response may carry the target security algorithm selected by the target access network device.

S805, the access network device B sends a response message of the fifth message to the access network device A.

The response message may carry target cell information. Optionally, the response message may also carry the reserved non-contention random access resource configuration information of the target cell.

Optionally, the response message may also carry information used by the terminal device A to determine the target key and/or the target security algorithm. The information used to determine the target key may include the target NCC.

S806, the access network device A sends message 4 to the terminal device A.

S807, the terminal device A sends a fourth message to the target access device.

Wherein, regarding S806 and S807, reference may be made to the relevant descriptions in S706-S707, which will not be repeated here.

In the embodiment of the present application, in the process of connection recovery or re-establishment of the terminal device, a suitable target access network device is determined for the terminal device in time, so as to better provide services for the terminal device.

It can be understood that, in the above embodiments, the methods and/or steps implemented by the terminal device may also be implemented by a component (such as a chip or circuit) that can be used in the terminal device, and the access network device (such as the first access network device). network equipment, the second access network equipment, the methods and/or steps implemented by the access network equipment A or the access network equipment B), can also be implemented by components that can be used for the access network equipment, and the core network equipment or the core network equipment The methods and/or steps implemented by a node may also be implemented by components available for core network equipment or core network nodes.

It can be understood that, in the embodiments of the present application, the terminal device and/or the access network device may perform some or all of the steps in the embodiments of the present application, these steps or operations are only examples, and the embodiments of the present application may also perform other operations or Variations of various operations. In addition, various steps may be performed in different orders presented in the embodiments of the present application, and may not be required to perform all the operations in the embodiments of the present application.

The foregoing mainly introduces the solutions provided by the embodiments of the present application from the perspective of interaction between various network elements. Correspondingly, an embodiment of the present application further provides a communication device, where the communication device is used to implement the above-mentioned various methods. The communication apparatus may be the terminal equipment involved in the above method embodiments, or a device including the above terminal equipment, or a component that can be used for the terminal equipment; or, the communication apparatus may be involved in the above method embodiments. The access network device (such as the first access network device, the second access network device, the access network device A, or the access network device B), or a device including the above-mentioned access network device, or a device that can be used to connect A component of a network access device; or, the communication device may also be a core network node involved in each of the foregoing method embodiments, or a device including the foregoing core network node, or a component usable for a core network node. It can be understood that, in order to realize the above-mentioned functions, the communication apparatus includes corresponding hardware structures and/or software modules for executing each function. Those skilled in the art should easily realize that the present application can be implemented in hardware or a combination of hardware and computer software with the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein. Whether a function is performed by hardware or computer software driving hardware depends on the specific application and design constraints of the technical solution. Skilled artisans may implement the described functionality using different methods for each particular application, but such implementations should not be considered beyond the scope of this application.

In the embodiments of the present application, the communication device may be divided into functional modules according to the above method embodiments. For 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-mentioned integrated modules can be implemented in the form of hardware, and can also be implemented in the form of software function modules. It should be noted that, the division of modules in the embodiments of the present application is schematic, and is only a logical function division, and there may be other division manners in actual implementation.

For example, it is assumed that the communication device is the first access network device in the foregoing method embodiment. FIG. 9 shows a schematic structural diagram of a communication device 90 . The communication device 90 includes a sending module 901 and a receiving module 902 . The sending module 901 and the receiving module 902 can exist independently in the form of interfaces, or can be integrated into a transceiver module. The transceiver module can also be referred to as a transceiver unit to implement sending and/or receiving functions. , transceiver or communication interface.

Wherein, all relevant contents of the steps involved in the above method embodiments can be cited in the functional descriptions of the corresponding functional modules, which are exemplified below, and will not be described in detail here.

For example, the sending module 901 may be configured to send the first message to the second access network device, where reference may be made to the description of the previous embodiment for the first message.

The receiving module 902 may be configured to receive a response message of the first message from the second access network device.

Optionally, the receiving module 902 may also be configured to receive measurement reports and service information from the terminal device.

Optionally, the access network device 90 may further include a processing module 903, configured to determine the above-mentioned second access network device according to the measurement report and the service information.

Optionally, the sending module 901 may also be used for the terminal device to send the content of the security mode command message and the content of the RRC reconfiguration message.

Optionally, the receiving module 902 may further receive second indication information from the second access network device, where the second indication information indicates that the first access network device does not receive a response message to the security mode command message.

Optionally, the receiving module 902 may also be configured to receive a response message of the security mode command message from the terminal device.

Optionally, in the case where the advance measurement report is sent through a message or signaling before message 4: the receiving module 902 can also be used to receive a random access preamble from the terminal device, and the processing module 903 is used to receive the random access preamble according to the random access The information of the preamble determines that the terminal device has an advance measurement report to be sent, and the sending module 901 can be configured to send a random access response (message 2) to the terminal device, wherein the random access response includes a message for the advance measurement report. The uplink scheduling information of the measurement report. It can be understood that the interaction between the structures and modules involved in this case can also be implemented independently.

The "module" in the embodiments of the present application may refer to an application-specific integrated circuit ASIC, a circuit, a processor and memory executing one or more software or firmware programs, an integrated logic circuit, and/or other devices that can provide the above-mentioned functions. In a simple embodiment, those skilled in the art can imagine that the communication apparatus 90 can be in the form of the access network device 20 shown in FIG. 2 .

For example, the processor 201 in the access network device 20 shown in FIG. 2 may call the computer stored in the memory 202 to execute instructions, so that the access network device 20 executes the communication method in the above method embodiment.

In a possible manner, the function/implementation process of the sending module 901 and the receiving module 902 in FIG. 9 can be implemented by the processor 201 in the access network device 20 shown in FIG. 2 calling the computer execution instructions stored in the memory 202. accomplish. Alternatively, the functions/implementation process of the sending module 901 and the receiving module 902 in FIG. 9 may be implemented by the transceiver 203 in the access network device 20 shown in FIG. 2 , and the functions/implementation of the processing module 903 in FIG. 9 The process may be implemented by the processor 201 described in FIG. 2 .

Since the communication device 90 provided in this embodiment can execute the above-mentioned communication method, the technical effect that can be obtained can be referred to the above-mentioned method embodiment, which is not repeated here.

For example, it is assumed that the communication device is the second access network device in the foregoing method embodiment. FIG. 10 shows a schematic structural diagram of a communication apparatus 1000 . The communication device 1000 includes a receiving module 1001 and a sending module 1002 . The receiving module 1001 and the sending module 1002 can exist independently in the form of interfaces, or can be integrated into a transceiver module. , transceiver or communication interface.

Wherein, all relevant contents of the steps involved in the above method embodiments can be cited in the functional descriptions of the corresponding functional modules, which are exemplified below, and will not be described in detail here.

For example, the receiving module 1001 may be configured to receive a first message from a first access network device, where the first message includes the identification information of the terminal device, the reason why the terminal device initiates the establishment of the RRC connection, and Identification information of the public land mobile network PLMN selected by the terminal device.

The sending module 1002 may be configured to send a response message (first response message) of the first message to the first access network device.

In a possible manner, the first response message sent by the sending module 1002 may further include information of the first key.

Optionally, the sending module 1002 may further send second indication information to the first access network device, where the second indication information indicates that the first access network device does not receive the second response message.

Optionally, the receiving module 1001 may also be configured to receive a second response message from the terminal device.

Optionally, the receiving module 1001 may also be configured to receive a third response message from the terminal device.

For the relevant description of each message, reference may be made to the relevant description in the method embodiment, which will not be repeated here.

In this embodiment, the "module" here may refer to an application-specific integrated circuit ASIC, a circuit, a processor and memory executing one or more software or firmware programs, an integrated logic circuit, and/or other devices that can provide the above-mentioned functions. In a simple embodiment, those skilled in the art can imagine that the communication apparatus 1000 may be in the form of the access network device 20 shown in FIG. 2 .

In a possible way, the function/implementation process of the receiving module 1001 and the sending module 1002 in FIG. 10 can be achieved by calling the computer execution instructions stored in the memory 202 by the processor 201 in the access network device 20 shown in FIG. 2 . accomplish. Alternatively, the functions/implementation processes of the receiving module 1001 and the sending module 1002 in FIG. 10 may be implemented by the transceiver 203 in the access network device 20 shown in FIG. 2 .

For example, it is assumed that the communication apparatus is the terminal device in the foregoing method embodiment. FIG. 11 shows a schematic structural diagram of a communication device 11 . The communication device 11 includes a sending module 1101 and a receiving module 1102 . The sending module 1101 and the receiving module 1102 can exist independently in the form of interfaces, or can be integrated into a transceiver module. The transceiver module can also be called a transceiver unit to implement sending and/or receiving functions. , transceiver or communication interface.

Wherein, all relevant contents of the steps involved in the above method embodiments can be cited in the functional descriptions of the corresponding functional modules, which are exemplified below, and will not be described in detail here.

For example, the receiving module 1102 may be configured to receive a security mode command message from the first access network device, wherein the content of the security mode command message is consistent with the content of the security mode message determined by the second access network device, so The security mode command message includes the information of the first key, and the first key is determined according to the initial key determined by the core network, the physical cell identifier of the source cell, and the frequency point of the source cell, wherein the source cell belonging to the first access network device.

The sending module 1101 is configured to send a response message to the security mode command message, where the response message to the security mode command may be sent to the first access network device or the second access network device.

In addition, optionally, the sending module 1101 may also be configured to send a measurement report and service information to the first access network device.

Optionally, the sending module 1101 may be further configured to send a second message indicating that the RRC reconfiguration of the radio resource control is completed to the second access network device.

Optionally, the receiving module 1102 may be further configured to receive first indication information from the first access network device, where the first indication information is used to instruct the second access network device to send the security Response message for the mode command message. In a possible manner, in the case of receiving the first indication information, the sending module 1101 sends a response message of the security mode command message to the second access network device.

In a possible way, in the case that the advance measurement report is sent through the signaling or message before message 4: the sending module 1101 can also be used to send a random access preamble to the first access network device, and the receiving module 1102 can be used to receive a random access response (message 2) from the first access network device, wherein the random access response includes uplink scheduling information used for the advance measurement report, and the sending module 1101 is configured to receive the data according to the receiving module 1102. The received uplink scheduling information sends an advance measurement report to the first access network device. It can be understood that the interaction between the structures and modules involved in this case can also be implemented independently.

In this embodiment, the "module" here may refer to an application-specific integrated circuit ASIC, a circuit, a processor and memory executing one or more software or firmware programs, an integrated logic circuit, and/or other devices that can provide the above-mentioned functions. In a simple embodiment, those skilled in the art can imagine that the communication apparatus 11 may be in the form of the terminal device 30 shown in FIG. 2 .

For example, the processor 301 in the terminal device 30 shown in FIG. 2 may invoke the computer execution instructions stored in the memory 302 to cause the terminal device 30 to execute the communication method in the above method embodiment.

In a possible manner, the function/implementation process of the sending module 1101 and the receiving module 1102 in FIG. 11 can be implemented by the processor 301 in the terminal device 30 shown in FIG. 2 calling the computer execution instructions stored in the memory 302 . Alternatively, the functions/implementation process of the sending module 1101 and the receiving module 1102 in FIG. 11 may be implemented by the transceiver 303 in the terminal device 30 shown in FIG. 2 .

Embodiments of the present application further provide a communication apparatus, which is used to implement the related functions/implementation processes of the first node in the foregoing method embodiments. For example, the communication apparatus may include a sending module for sending a message to the core network node for delivering the non-access stratum signaling of the terminal device to the core network node, and a receiving module for receiving a response message from the core network node, Further, the sending module may also send a message including an initial context establishment response, a session resource identifier and address information for transmitting downlink data of the session resource to the core network node after the RRC reconfiguration of the terminal device is completed. It should be noted that the sending module and the receiving module can exist independently in the form of interfaces, or can be integrated into a transceiver module, and the transceiver module can also be called a transceiver unit to implement the sending and/or receiving functions, such as a transceiver circuit. , transceiver, transceiver or communication interface.

The embodiments of the present application further provide a communication apparatus, which is used to implement the relevant functions/implementation processes of the core network nodes in the foregoing method embodiments. For example, the communication apparatus may include a receiving module for receiving a message from the first node for delivering the non-access stratum signaling of the terminal device to the core network node; and a sending module for sending a response message to the first node , and further, after the terminal equipment RRC reconfiguration is completed, the receiving module is configured to receive from the first node a message including an initial context establishment response, a session resource identifier and address information for transmitting downlink data of the session resource. The sending module and the receiving module can exist independently in the form of interfaces, or can be integrated into a transceiver module. The transceiver module can also be called a transceiver unit to implement sending and/or receiving functions. For example, it can be a transceiver circuit, a transceiver, a transceiver. device or communication interface.

An embodiment of the present application further provides a communication apparatus, including a module for implementing the relevant function/implementation process corresponding to the access network device A in the embodiment shown in FIG. 7 or FIG. 8 . For example, for the sending module and the receiving module, for the specific interaction between the sending module and the receiving module, reference may be made to the steps related to sending and receiving in the method embodiment, which will not be repeated here.

An embodiment of the present application further provides a communication apparatus, including a module for implementing the relevant function/implementation process corresponding to the access network device B in the embodiment shown in FIG. 7 or FIG. 8 . For example, for the sending module and the receiving module, for the specific interaction between the sending module and the receiving module, reference may be made to the steps related to sending and receiving in the method embodiment, which will not be repeated here.

An embodiment of the present application further provides a communication apparatus, including a module for implementing the relevant function/implementation process corresponding to the target access network device in the embodiment shown in FIG. 7 or FIG. 8 . For example, for the sending module and the receiving module, for the specific interaction between the sending module and the receiving module, reference may be made to the steps related to sending and receiving in the method embodiment, which will not be repeated here.

An embodiment of the present application further provides a communication apparatus, including a module for implementing the relevant function/implementation process corresponding to the terminal device A in the embodiment shown in FIG. 7 or FIG. 8 . For example, for the sending module and the receiving module, for the specific interaction between the sending module and the receiving module, reference may be made to the steps related to sending and receiving in the method embodiment, which will not be repeated here.

Optionally, an embodiment of the present application further provides a communication apparatus (for example, the communication apparatus may be a chip or a chip system), where the communication apparatus includes a processor for implementing the method in any of the foregoing method embodiments. In one possible design, the communication device further includes a memory. The memory is used to store necessary program instructions and data, and the processor can call the program code stored in the memory to instruct the communication apparatus to execute the method in any of the above method embodiments. Of course, the memory may also not be in the communication device. When the communication device is a chip system, it may be composed of a chip, or may include a chip and other discrete devices, which is not specifically limited in this embodiment of the present application.

In the above-mentioned embodiments, it may be implemented in whole or in part by software, hardware, firmware or any combination thereof. When implemented using a software program, it can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on the computer, all or part of the processes or functions described in the embodiments of the present application are generated. The computer may be a general purpose computer, special purpose computer, 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 downloaded from a website site, computer, server, or data center Transmission to another website site, computer, server, or data center by wire (eg, coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (eg, infrared, wireless, microwave, etc.). The computer-readable storage medium can be any available medium that can be accessed by a computer or data storage devices including one or more servers, data centers, etc. that can be integrated with the medium. The usable media may be magnetic media (eg, floppy disks, hard disks, magnetic tapes), optical media (eg, DVDs), or semiconductor media (eg, solid state disks (SSDs)), and the like. In this embodiment of the present application, the computer may include the aforementioned apparatus.

Although the application is described herein in conjunction with the various embodiments, those skilled in the art will understand and understand from a review of the drawings, the disclosure, and the appended claims in practicing the claimed application. Other variations of the disclosed embodiments are implemented. In the claims, the word "comprising" does not exclude other components or steps, and "a" or "an" does not exclude a plurality. A single processor or other unit may fulfill the functions of several items recited in the claims. The mere fact that certain measures are recited in mutually different dependent claims does not indicate that these measures cannot be combined to advantage.

Although the application has been described in conjunction with specific features and embodiments thereof, it will be apparent that various modifications and combinations can be made therein without departing from the spirit and scope of the application. Accordingly, this specification and drawings are merely exemplary illustrations of the application as defined by the appended claims, and are deemed to cover any and all modifications, variations, combinations or equivalents within the scope of this application. Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to include these modifications and variations.

Claims (26)

1. A method of communication, the method comprising:

a first access network device sends a first message to a second access network device, wherein the first message comprises identification information of a terminal device, a reason for the terminal device to initiate Radio Resource Control (RRC) connection establishment and identification information of a Public Land Mobile Network (PLMN) selected by the terminal device;

the first access network device receives a response message to the first message from the second access network device.

2. The method of claim 1, further comprising, prior to the first access network device sending the first message to the second access network device:

the first access network equipment receives a measurement report and service information from the terminal equipment;

and the first access network equipment determines the second access network equipment according to the measurement report and the service information.

3. The method according to claim 2, wherein the traffic information comprises registered target core network node identification information and/or a list of single network slice selection support information.

4. The method of claim 3, wherein the determining, by the first access network device, the second access network device according to the measurement report and the service information comprises: the first access network equipment determines that the terminal equipment is not supported according to the service information, and selects the second access network equipment according to the measurement report; wherein the determining that the requirement of the terminal device is not supported comprises:

determining that the target core network node is congested or that the target core network node does not support the terminal device to access; and/or determining that the slice is congested or that the slice does not support the terminal device access.

5. The method according to any of claims 1-4, wherein the response message of the first message is used to determine that the terminal device is allowed to access, and wherein the response message of the first message comprises the contents of a security mode command message and the contents of an RRC reconfiguration message.

6. The method of claim 5, further comprising: and the first access network equipment sends the content of the security mode command message and the content of the RRC reconfiguration message to the terminal equipment.

7. The method according to claim 5 or 6, wherein the content of the RRC reconfiguration message is a security protection according to an initial key and a security algorithm, wherein the initial key is from a core network.

8. The method according to claim 5 or 6, wherein the content of the RRC reconfiguration message is security protection according to a first key and a security algorithm, wherein the first key is determined according to an initial key from a core network and information of a source cell, the source cell belongs to the first access network device, and the information of the source cell includes at least one of a physical cell identifier of the source cell and a frequency point of the source cell.

9. The method according to claim 8, wherein the content of the security mode command message in the response message of the first message includes information of the first key, wherein the information of the first key includes first key indication information or a first key, and the first key indication information is used to instruct the terminal device to determine the first key according to the initial key and information of a source cell.

10. The method according to any of claims 5-9, wherein the content of the security mode command message in the response message of the first message includes first indication information, and the first indication information is used to instruct the terminal device to send the response message of the security mode command message to the second access network device.

11. The method of claim 10, further comprising receiving second indication information from the second access network device, the second indication information indicating that the first access network device does not receive the response message to the security mode command message from the terminal device.

12. The method of claim 6, further comprising:

receiving a response message to a security mode command message from the terminal device, the response message to the security mode command message being in response to the content of the security mode command message received from the first access network device.

13. The method according to any of claims 1-12, wherein the measurement report is an advanced measurement report.

14. The method of claim 13, wherein in the case that the advanced measurement report is received before a collision resolution message, the method further comprises:

receiving a random access preamble (message 1) from the terminal device;

determining a pre-measurement report to be sent by the terminal equipment according to the information of the random access preamble;

and sending a random access response (message 2) to the terminal equipment, wherein the random access response comprises uplink scheduling information used for the advanced measurement report.

15. The method according to any of claims 1-14, wherein in case the terminal device is an inactive terminal device, the identification information of the terminal device comprises a deactivated radio network temporary identity I-RNTI; or, in the case that the terminal device is an idle terminal device, the identification information of the terminal device includes a mobile subscriber identity.

16. A method of communication, comprising:

receiving a security mode command message from a first access network device, wherein the content of the security mode command message is consistent with the content of a security mode message determined by a second access network device, the security mode command message includes information of a first key, the first key is determined according to an initial key determined by a core network and information of a source cell, wherein the source cell belongs to the first access network device, and the information of the source cell includes at least one of a physical cell identifier of the source cell and a frequency point of the source cell;

and sending a response message of the security mode command message, wherein the response message of the security mode command is security-protected according to the first secret key.

17. The method according to claim 16, wherein the information of the first key includes first key indication information or a first key, and the first key indication information is used to indicate that the first key is determined according to the initial key, a physical cell identifier of a source cell, and a frequency point of the source cell.

18. The method of claim 16 or 17, further comprising:

and sending a second message indicating that Radio Resource Control (RRC) reconfiguration is completed to the second access network equipment, wherein the second message is subjected to security protection according to a second key, the second key is determined according to the first key and information of a target cell, the target cell belongs to the second access network equipment, and the information of the target cell comprises at least one of a physical cell identifier of the target cell and a frequency point of the target cell.

19. The method according to any one of claims 16-18, further comprising: receiving first indication information from the first access network device, wherein the first indication information is used for indicating a response message of the security mode command message sent to the second access network device;

the response message to send the security mode command message includes: sending a response message to the second access network device to the security mode command message.

20. The method according to any of claims 16-19, wherein said sending a response message to said secure mode command message comprises: sending a response message to the first access network device to the security mode command message.

21. The method of any of claims 16-20, wherein prior to receiving the security mode command message from the first access network device, further comprising: an advance measurement report is sent to the first access network device.

22. The method of claim 21, wherein in the case that the advanced measurement report is sent before a collision resolution message, the method further comprises:

sending a random access preamble (message 1) to the first access network device indicating the advance measurement report to be sent;

receiving a random access response (message 2) from the first access network device, wherein the random access response includes uplink scheduling information for the advanced measurement report;

the sending of the advance measurement report to the first access network device includes:

and sending the advanced measurement report to the first access network equipment according to the uplink scheduling information.

23. The method of claim 22, further comprising: indicating to the first access network device that the advanced measurement report did not send full information.

24. A communication device arranged to implement the method of any of claims 1 to 15.

25. A communication device arranged to implement the method of any of claims 16 to 23.

26. A computer-readable storage medium comprising instructions that, when executed, cause a communication apparatus to perform the method of any of claims 1-15 or cause the communication apparatus to perform the method of any of claims 16-23.

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