WO2020135850A1

WO2020135850A1 - Communication method and apparatus

Info

Publication number: WO2020135850A1
Application number: PCT/CN2019/129730
Authority: WO
Inventors: 耿婷婷; 严乐; 张宏平; 曾清海
Original assignee: 华为技术有限公司
Priority date: 2018-12-29
Filing date: 2019-12-30
Publication date: 2020-07-02
Also published as: CN115396927A; CN111385830B; CN111385830A

Abstract

According to a communication method and apparatus, and a system disclosed in embodiments of the present application, a first access network device transmits a first message to a second access network device, the first message comprising identification information of a terminal device, the reason why the terminal device initiates the establishment of a radio resource control (RRC) connection, and identification information of a public land mobile network (PLMN) selected by the terminal device; and the first access network device receives a response message of the first message from 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 delay for the terminal device for accessing a network is reduced.

Description

Communication method and device

This application requires the priority of a Chinese patent application filed on December 29, 2018, with the application number 201811644580.2 and the application name "Communication Method and Device", the entire contents of which are incorporated by reference in this application.

Technical field

The present application relates to the field of communication technology, and in particular, to a communication method and device that can realize fast switching.

Background technique

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

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

Summary of the invention

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

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

In a first aspect, a communication method is provided, including: a first access network device sends a first message to a second access network device, the first message includes identification information of a terminal device, and the terminal device initiates a wireless resource The reason for controlling the establishment of the RRC connection and the identification information of the public land mobile network PLMN selected by the terminal device; the first access network device receives a response message (first response message) of the first message from the second access network device.

This communication method can, for example, send the first message to the second access network device through the first access network device when the first access network device cannot provide the service service required by the UE, 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 registered target core network node identification information and/or single network slice selection support information list. Therefore, the first access network device can determine the target access network device when it cannot support the requirements of the terminal device, thereby shortening the time delay for the terminal device to access 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, the content of the security mode command message can be sent through the first access network device before the terminal device directly sends an access request to the second access network device The content of the RRC reconfiguration message is transferred to shorten the delay of the terminal device accessing the network.

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

In a possible implementation manner of the first aspect, the content of the foregoing RRC reconfiguration message is security protection according to a first key and a security algorithm, where the first key is based on the initial key and source from the core network The information of the cell determines that 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. With this implementation, the content of the RRC reconfiguration message is protected to ensure the authenticity and privacy of the message.

In the above first key information, the first key information includes first key indication information or first key, so that the first access network device can pass the first key information to the terminal device, The terminal device can 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 makes the first access network device know that the terminal device has activated the security mode or the activation of the security mode has failed.

In a possible implementation manner of the first aspect, in a 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 The access network device receives second indication information, and 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 second In 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 measurement report is an advance measurement report. Optionally, the advance measurement report may be carried in a message 3 or message 5, for example.

In a possible implementation manner of the first aspect, in the case where the advance measurement report is received through signaling or message before message 4, the advance of the terminal device to be sent can be determined based on the information of the random access preamble sent by the terminal device Measurement report, and send uplink authorization resource information for transmitting advance measurement report to the terminal equipment through message2. Through this implementation, the terminal device can quickly report the measurement report, so that the serving base station can perform mobility-related configuration faster, and improve the data transmission experience of the terminal device. It should be noted that this implementation may be implemented independently of other implementations of the first aspect.

In a second aspect, a communication method is provided, including: a second access network device receives a first message from a first access network device, and the second access network device sends a first message to the first access network device A response message (first response message), wherein the first message includes identification information of the terminal device, the reason why the terminal device initiates the establishment of a radio resource control 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 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 allow the terminal device to access In this case, the content of the security mode command message and the content of the RRC reconfiguration message are transferred 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 RRC reconfiguration message is security protection based on the initial key and the security algorithm, where the security protection includes integrity protection, or includes integrity protection and encryption protection. Through this implementation, the impact on the terminal device is reduced, and in addition, the content of the RRC reconfiguration message is securely protected to ensure the authenticity and privacy of the message.

In a possible implementation manner of the second aspect, the content of the foregoing RRC reconfiguration message is security protection according to the first key and the security algorithm, where the first key is based on the initial key and source from the core network The information of the cell determines that 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 content of the RRC reconfiguration message is protected to 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 terminal equipment, so that the terminal equipment 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 access network device sends second indication information, and 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 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.

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 learns that the terminal device activates the security mode or the security mode activation fails.

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

Optionally, assuming that the content of the RRC reconfiguration message is securely protected according to the initial key, the third response message may be securely protected according to the initial key, or may be securely protected according to the second key. 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 secured according to the first key, then the third response message may be based on the third key The key is used for security protection, and may also be used for security protection according to the second key described above, and the third key is determined (derived) based on 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 physical cell identity (PCI) of the target cell and frequency information of the target cell.

In a third aspect, a communication method is provided, including: a communication apparatus receives a security mode command message from a first access network device, wherein the content of the security mode command message and the security mode message determined by the second access network device Content is consistent, the security mode command message includes the information of the first key, the first key is determined based on the initial key determined by the core network, the source cell information, where the source cell belongs to all The first access network device; sending a response message of the security mode command message, wherein the response message of the security mode command is securely 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 1. 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 radio resource control RRC reconfiguration is completed to the second access network device, where the second message is based on the second password The key is used for security protection, and the second key is determined according to the first key, the identifier of the target cell, and the frequency 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 Sending a response message (second response message) of the security mode command message.

In a possible implementation manner of the third aspect, the communication apparatus may be a response message that sends 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 be carried in, for example, radio resource control RRC establishment in a random access process Request (message 3) or RRC establishment complete message (message 5).

In a possible implementation manner of the third aspect, in a case where the advance measurement report is sent through signaling or message before message 4, the communication device uses a random access preamble (message 1) to connect to the first 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 obtain uplink authorized resource information for sending the advance measurement report. It should be noted that this implementation may be implemented independently of other implementations 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 does not send complete information, so that the first access network device can learn the advance measurement report Whether the transmission is completed in order to make corresponding processing.

According to a fourth aspect, a communication method is provided, including: a first node sends a message to a core network node for transmitting non-access layer signaling of a terminal device to the core network node, and the first node receives a response from the core network node Message, 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.

With this communication method, by configuring the multi-connection configuration for the terminal device early 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.

According to a fifth aspect, a communication method is provided, including: receiving a message for transmitting non-access layer signaling of a terminal device to a core network node from a first node, sending a response message to the first node, and sending 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 first aspect. The communication device may be the first access network device in the above-mentioned first aspect, or an apparatus including the above 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 above, or an apparatus including the above 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 an apparatus including the above 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) disposed in the first node.

In 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 core network node, or a component (chip or circuit) disposed in the core network node.

The communication device according to any one of the above sixth to tenth aspects includes a module, unit, or means corresponding to the above method. The module, unit, or means can be implemented by hardware, software, or execute the corresponding software by hardware achieve. The hardware or software includes one or more modules or units corresponding to the above functions.

According to an eleventh aspect, a communication device is provided, including: a processor and a memory; the memory is used to store computer instructions, and when the processor executes the instructions, so that the communication device performs the method described in any one of the above aspects .

In a twelfth aspect, a communication device is provided, including: a processor; the processor is configured to couple with a memory and read an instruction in the memory, and then execute the method according to any one of the above aspects according to the instruction. According to a sixth aspect, a computer-readable storage medium is provided. The computer-readable storage medium stores instructions, which when executed on a computer, enables the computer to perform the method described in any one of the above aspects.

According to a thirteenth aspect, there is provided a computer program product containing instructions, which when executed, enables a communication device to perform the method described in any of the above aspects.

According to a fourteenth aspect, a communication device (for example, the communication device may be a chip or a chip system) is provided. The communication device includes a processor for implementing the method involved in any of the above aspects. In a 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 composed of a chip, or may include a chip and other discrete devices.

According to a fifteenth aspect, there is provided a communication system including the communication device according to the sixth aspect and the communication device according to the seventh aspect, or including the communication device according to the sixth to eighth aspects, or including the The communication device described in the ninth and tenth aspects.

BRIEF DESCRIPTION

1 is a schematic structural diagram of a communication system provided by an embodiment of this application;

2 is a schematic structural diagram of an access network device and a terminal device provided by an embodiment of this application;

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

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 yet another communication method provided by an embodiment of the present application;

7 is a schematic flowchart of another communication method according to an embodiment of the present application;

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

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

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

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

detailed description

The technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application. In the description of this application, unless otherwise stated, "/" means that the related objects are in an "or" relationship. For example, A/B can mean A or B; "and/or" in this application "It is just a kind of association relationship that describes the related objects, indicating that there can be three kinds of relationships, for example, A and/or B, which can mean: A exists alone, A and B exist at the same time, B exists alone in three cases, where A , B can be singular or plural. And, in the description of the present application, unless otherwise stated, "plurality" means two or more than two. "At least one of the following" or a similar expression refers to any combination of these items, including any combination of a single item or a plurality of items. For example, at least one item (a) in a, b, or c can represent: a, b, c, ab, ac, bc, or abc, where a, b, c can be a single or multiple . In addition, in order to facilitate a clear description of the technical solutions of the embodiments of the present application, in the embodiments of the present application, the words “first” and “second” are used to distinguish the same or similar items whose functions and functions are basically the same. Those skilled in the art may understand that the words "first" and "second" do not limit the number and execution order, and the words "first" and "second" do not necessarily mean different.

In addition, the network architecture and business scenarios described in the embodiments of the present application are intended to more clearly explain the technical solutions of the embodiments of the present application, and do not constitute a limitation on the technical solutions provided by the embodiments of the present application. With the evolution of the network architecture and the emergence of new business scenarios, the technical solutions provided by the embodiments of the present application are also applicable to similar technical problems.

As shown in FIG. 1, it is a communication system 10 provided by 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 after receiving the first message, the access network device 40 sends a corresponding response message to the access network device 20. 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, it may send a confirmation response message (a type of response message) 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 (SMC) message and the RRC reconfiguration message. After configuring the content of the message, corresponding operations can be performed, such as sending a security mode command completion message to the

access network device

20 or 40 and sending an RRC reconfiguration completion message to the access network device 40, which is not limited in the embodiments of the present application . It should be noted that, in the embodiments of the present application, accepting the terminal device is a brief expression method that allows the terminal device to access.

In another possible manner, when the access network device 40 determines not to accept the terminal device 30, it may send a negative response message to the access network device 20, so that the access network device 20 learns that the access network device 40 is not Accepted terminal equipment 30.

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 interaction with multiple access network devices 40, and different access network devices 40 may send different response messages to the access network device 20.

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 , Short message service (SMS, short message service) that is actively triggered, high priority access for multimedia priority services (MPS, Multimedia Priority Service), high priority access for mission-critical services (MCS) Other RRC establishment reasons. It can be understood that the cause of RRC establishment may also be referred to as the cause of RRC connection establishment.

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). 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 may be called an MN, and the remaining access devices may 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 by the embodiment of the present application.

Wherein, the terminal device 30 includes at least one processor (exemplarily illustrated in FIG. 2 including one processor 301) and at least one transceiver (exemplified illustrated in FIG. 2 including one transceiver 303) ). Optionally, the terminal device 30 may further include at least one memory (exemplified in FIG. 2 by including a memory 302 as an example), and at least one output device (exemplified in FIG. 2 by including an output device 304 as an example) (For explanation) and at least one input device (in FIG. 2, an example is described by including an input device 305 as an example).

The processor 301, the memory 302, and the transceiver 303 are connected by a communication line. The communication line may include any path to transfer information between the above components.

The processor 301 may be a general-purpose central processing unit (central processing unit, CPU), a microprocessor, an application-specific integrated circuit (ASIC), or one or more integrations for controlling the execution of the program program 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. The processor here 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 can be read-only memory (ROM) or other types of static storage devices that can store static information and instructions, random access memory (random access memory, RAM), or other types of information and instructions that can be stored. Dynamic storage devices can also be electrically erasable programmable read-only memory (electrically erasable programmable-read-only memory (EEPROM), read-only compact disc (compact disc read-only memory, CD-ROM) or other optical disc storage, optical disc storage ( (Including compact discs, laser discs, optical discs, digital versatile discs, Blu-ray discs, etc.), disk storage media or other magnetic storage devices, or can be used to carry or store the desired program code in the form of instructions or data structures and can be stored by the computer Any other media, but not limited to this. 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 to store computer execution instructions for executing the solution of the present application, and the processor 301 controls execution. Specifically, the processor 301 is used to execute computer execution instructions stored in the memory 302, so as to implement the communication method described in the embodiments of the present application. Optionally, the computer execution instructions in the embodiments of the present application may also be called application program codes or computer program codes, which are not specifically limited in the embodiments of the present application.

The transceiver 303 may use any device such as a transceiver for communicating with other devices or communication networks, such as Ethernet, wireless access network (RAN), or wireless local area networks (WLAN) Wait. 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 various 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. Wait.

The input device 305 communicates with the 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.

The access network device 20 includes at least one processor (exemplarily illustrated in FIG. 2 including one processor 201), and at least one transceiver (exemplified illustrated in FIG. 2 including one transceiver 203) ) And at least one network interface (exemplarily illustrated in FIG. 2 by including one network interface 204). Optionally, the access network device 20 may further include at least one memory (the example in FIG. 2 includes a memory 202 as an example). Among them, 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 to the core network device through a link (such as an S1 interface), or connect to the network interface of other access network devices through a wired or wireless link (such as an X2 interface) (not shown in FIG. 2) This 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 connects the terminal device 30 to a wireless network, and may be an evolutionary base station (evolutional Node) in long term evolution (LTE) B, eNB or eNodeB); or base station in eLTE; or base station in 5th generation (5G) network or public land mobile network (PLMN) in future evolution, broadband network service gateway (broadband network gateway (BNG), aggregation switch or non-3rd generation partnership project (3rd generation partnership project, 3GPP) access equipment, etc. This embodiment of the present application does not specifically limit this. Optionally, the base stations in the embodiments of the present application may include various forms of base stations, such as macro base stations, micro base stations (also called small stations), relay stations, and access points, which are not specifically limited in the embodiments of the present application. .

In a network structure, the 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), 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 (radio resource control (RRC) layer, a packet data convergence layer protocol (packet data convergence protocol, PDCP) layer, a radio link control (radio link control (RLC) layer, a media access The functions of protocol layer such as media access (MAC) layer and physical layer. The user plane protocol layer structure can include PDCP layer, RLC layer, MAC layer and physical layer protocol layer functions; in one implementation, the PDCP layer can also include a service data adaptation (service data adaptation (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 evolved structure, RAN equipment may include a centralized unit (CU) and a distributed unit (DU), Multiple DUs can be centrally controlled by a CU.

CU and DU can be divided according to the protocol layer 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 the 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).

This division of the 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 above are set in the CU, and the functions of the protocol layers below the RLC layer are set in the DU; Or, in a certain protocol layer, for example, some functions of the RLC layer and the functions of the protocol layer above the RLC layer are set in the CU, and the remaining functions of the RLC layer and the functions of the protocol layer below the RLC layer are set in the DU. In addition, it can also be divided in other ways, for example, according to delay, and the function that the processing time needs to meet the delay requirement is set in the DU, and the function that does not need to meet the delay requirement is set in the CU.

Optionally, the terminal device 30 in the 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. Among them, the terminal may be a user equipment (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. Access terminals can be cellular phones, cordless phones, session initiation protocol (SIP) phones, wireless local loop (WLL) stations, personal digital processing (personal digital assistant (PDA), wireless communication Functional 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 wireless terminal in control), wireless terminal in self-driving (self-driving), wireless terminal in remote medical (remote), wireless terminal in smart grid (smart), wireless in transportation safety (transportation safety) Terminals, wireless terminals in smart cities (smart cities), wireless terminals in smart homes (smart homes), etc. The terminal can be mobile or fixed.

Optionally, in the embodiments 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 device or a dedicated device. The example does not specifically limit this.

In various embodiments of the present application, a beam can be understood as a spatial resource, which can refer to a transmission or reception precoding vector with energy transmission directivity. Moreover, the sending or receiving precoding vector can be identified by index information, which can correspond to the resource identity (ID) of the configured terminal, for example, the index information can correspond to the identity or resource of the configured SSB; also It may correspond to the configured identifier or resource of the CSI-RS; it may also correspond to the configured identifier or resource of the uplink sounding reference signal (SRS). Optionally, the index information may also be index information displayed or implicitly carried by a signal or channel carried by a beam. The energy transmission directivity may refer to the precoding processing of the signal to be sent by the precoding vector, the signal after the precoding processing has a certain spatial directivity, and the precoding processing after receiving the precoding vector The signal has better received power, such as satisfying the reception demodulation signal-to-noise ratio, etc.; the energy transmission directivity may also mean that the same signal sent from different spatial positions received by 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. Regarding the configuration or capabilities 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 messages 1-message 4 may correspond to the first message to the fourth message in the competitive random access process, 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, 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 referred to as message (the first message) and message (b) The second message), where message is the same as message 1 and message 3 described above, and message 2 is the same as message 2 and message 4 described above. 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, and 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 message4, such as messageb. In addition, in the 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 the present application do not describe in detail the function of each message in the process of competitive random access.

The communication method provided by the embodiment of the present application will be described in conjunction with FIGS. 1 and 2 below.

It should be noted that the name of the message between the network elements or the name of each parameter in the message in the following embodiments of the present application is just an example, and other names may be used in the specific implementation, which is not specified in the embodiments of the present application. limited.

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

S301. The terminal device sends a measurement report to the 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 or inactive state. The inactive state is an RRC state, which may also be called "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 unlike the idle state, in the deactivated state, the terminal device and the access network device save the context of the terminal. Among them, an access network device that configures a terminal device to enter a deactivated state and stores context information of the terminal device is generally referred to as a source network device or an anchor network device. Optionally, for the definition of the deactivation state, please refer to the relevant description in 3GPP TS 38.300.

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

Optionally, for a terminal device in an idle state, a measurement report may be sent to the first access network device through an RRC establishment request message (for example, message 3) or an RRC establishment completion message (for example, 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). The first access network device may be an anchor network device or a non-anchor network device.

In the embodiment of the present application, the measurement report sent through message 3 (or message) 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) are multiplexed on the same MAC data. The packet is sent, for example, multiplexed in the MAC service data unit (service data unit, SDU), or the measurement report and message 3 (or message) are on different upstream authorized resources before message 4 (or message) b, respectively. send.

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

Optionally, message 5 may include identification information of the selected public land mobile network (PLMN). Further, in addition to the selected PLMN identification information, the message 5 can also include the registered target core network node identification information and single network slice selection support information (S-NSSAI) list and other information, This embodiment of the present application does not limit this. In the case where the measurement report is sent through message 5, the measurement report may also be included in message 5.

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

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

Wherein, the service information here refers to information used to indicate the service or network requirements of the terminal device. Optionally, the service information may also be referred to as network information.

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

For example, in a 5G system, the aforementioned core network node may be an access mobility management function (access and mobility management function, AMF). In the 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 foregoing service information may be sent through message 5, or may be sent in other ways, which is not limited in the embodiment of the present application.

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

In addition, S301 and S302 may also be executed at different times, that is, the measurement report and the service information may be sent to the first access network device through different messages. The embodiment of the present application does not limit the sequence of S301 and S302.

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

For example, the first access network device determines whether it can support or meet the needs of the terminal device according to the service information, thereby determining whether to provide services for the terminal device. If the first access network device determines that the terminal device cannot be served, it may further determine the second access network device according to the measurement report, and execute S304 and subsequent processes. It can be understood that, if the first access network device determines that it can provide services for the terminal device, it is not necessary to perform the subsequent process of the embodiment of the present application, but select a suitable core network for the terminal device according to the service information of the terminal device Nodes and provide business services required by the terminal equipment. Or, if the first access network device cannot determine a suitable second access network device, it may not perform the subsequent process of the embodiment of the present application, but may send a rejection message or a release message to the terminal device to refuse to provide Business services required by the terminal equipment.

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 be further determined based on the configuration information of the wireless network area (radio) area of the terminal device. The second access network device, for example, preferentially selects the second access network device that satisfies the conditions in the RNA to provide services to the terminal device.

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

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, where the target core network node 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 a suitable second access network device according to the measurement report sent in S302, for example, select the access network device whose cell signal quality meets the preset condition as the second access network device. The preset condition here may be, for example, that the cell signal quality is greater than or equal to a preset threshold, which is not limited in this embodiment of the present application. Here, a suitable second access network device is also a second access network device determined by the first access network device. 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, which means that the second access network device can be determined without sending the first message to any one or more second access network devices in the above manner. 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 the first message needs to be sent 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 devices at other timings. The second access network device sends the first message, which is not limited in this embodiment of the present application. The determination of the second access network device based on the service information and the measurement report can enable the first access network device to determine the target access network device when it cannot support the needs of the terminal device, thereby shortening the terminal device access to the network Delay.

If there are multiple second access network devices, the following processes are performed between the first access network device and each second access network device. The following takes an example of a second access network device. In the 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 includes at least the identification information of the terminal device, the reason for establishing the radio resource control RRC 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 2. The subsequent interaction between the access network equipment and the core network node.

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

Optionally, the first message may further include one or more of the following information: registered core network identification information, globally unique core network identification type (guami-type, Globally Unique AMF, Identifier type), and S-NSSAI list 3. Dedicated NAS messages. The above information may also be obtained by the first access network device from a message (such as message 5) sent by the terminal device.

In a possible manner, the first message may include part or all of the content included in the message 3 (or message) 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 terminal identification information of a non-access layer, such as a temporary mobile subscriber identity (temporary mobile identity (TMSI) or 5G-TMSI).

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

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 the response message of the first message from the second access network device. This 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, etc., so as to send a corresponding first response to the first access network device news. It should be noted that the embodiment of the present application does not limit how the second access network device determines whether to allow the terminal device to access.

In a possible manner, in a case where 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. Understandably, the content of the security mode command message and the content of the RRC reconfiguration message may be included in the same confirmation response message, or may be included in different confirmation 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. Among them, 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. Understandably, the target cell belongs to the second access network device Of the community. It can be understood that the content of the security mode command message may also be called security mode command information, and the content of the RRC reconfiguration message may also be called RRC reconfiguration information. Before the terminal device directly sends an access request to the second access network device, the content of the security mode command message and the content of the RRC reconfiguration message are passed through the first access network device, thereby reducing 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 can also be sent to the first access network device through different messages, respectively.

As an implementation, the content of the security mode command message and the content of the RRC reconfiguration message are included in the form of encapsulated packet data convergence protocol control protocol data unit (packet data convergence protocol control data protocol unit, PDCP-C PDU) The confirmation response 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, Integrity protection can be performed, or integrity protection and encryption protection can be performed. In the embodiments of the present application, the security protection includes integrity protection, or includes integrity protection and encryption protection.

In another possible manner, in the case where the second access network device determines not to admit the terminal device, it may send negative response 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, the embodiments of the present application may further include the following steps:

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 a single message, or may be sent to the terminal device at different timings through different messages. 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, after receiving the content of the security mode command message transmitted by the first access network device, the terminal device may send a response message to the first access network device. Or, after receiving the content of the security mode command message, the terminal device sends a response message to the first access network device or the second access network device according to the corresponding instruction 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 sends a response message to the second access network device. For the response message mentioned in this embodiment, reference may be made to the description of the embodiment in FIG. 4 for details.

In the embodiments 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, reducing the time for the terminal device to access the network Delay.

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 provides a communication method. The method may include:

S401. The terminal device sends a measurement report to the 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.

Among them, for the implementation manners and specific descriptions of S401-S403, reference may be made to the relevant descriptions at S301-S303, and details are not 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. Understandably, the content of the security mode command message and the content of the RRC reconfiguration message may be included in the same confirmation response message, or may be included in different confirmation response messages.

In a possible manner, the content of the RRC reconfiguration message may be securely protected according to the initial key and a certain security algorithm (which may be called the first security algorithm). This method can reduce the impact on the terminal device. In addition, the content of the RRC reconfiguration message is protected to ensure the authenticity and privacy of the message.

The initial key may be from the core network device, for example, the core network device determines and sends the initial key 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 the algorithm with the highest priority among the security algorithms it supports as the first security algorithm. The embodiment of the present application does 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 learn 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 yet another possible manner, the content of the RRC reconfiguration message may be security protection according to the first key and the first security algorithm, where the first key is determined according to the initial key and the 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 of the source cell. The source cell 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 way, the content of the RRC reconfiguration message is protected to ensure the authenticity and privacy of the message.

Optionally, in the case where 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 first key network information 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 learn that the content of the RRC reconfiguration message is securely protected 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 where 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. The embodiment of the present application does not limit the manner in which the second access network device sends the first key information to the first access network device.

S405. The first access network device sends the content of the 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 a second response message to the first access network device, or may send a 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 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 indicate that the second response message is sent to the first access network device. If the first response information is not included in the first response message, the terminal device sends the second response message to the second access network device by default. Second response message. The embodiment of the present application does not limit how the first indication information is specifically indicated, 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, in the case where 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 to the first access network device. Indication information, 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 avoid that the first access network device receives the security mode command message caused by the inconsistent operation of the terminal device and the first access network device The corresponding news brings about energy consumption. 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, after 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 security mode completion 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 learns about the terminal The device failed to activate safe mode. The second response message may be, for example, a security 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 of the second response message (the first access network device or the second access network device), the second The response message has a corresponding security mechanism:

For example, assuming that the content of the RRC reconfiguration message sent by the second access network device is securely protected 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 second response message can also be 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 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 security mechanism of the third response message below description;

Or, assuming that the content of the RRC reconfiguration message sent by the second access network device is securely protected 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 may also be protected 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 based on the first key and the first security algorithm for security Protected, and the second response message is sent to the second access network device, then the second response message can be securely protected according to the same security mechanism as the third response message, for details, please refer to the security of the third response message below Description of the mechanism. It can be seen that, in the case where the second response message is sent to the first access network device, the second response message may be secured according to the same security mechanism as the content of the RRC reconfiguration message described in S404, In the case where the second response message is sent to the second access network device, the second response message may be protected 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 an RRC reconfiguration message.

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

In the case where RRC reconfiguration can be successfully completed, the terminal device may send a third response message (which may also be called 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 completion message or a handover completion 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, then 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 securely protected according to the first key, then the third The response message may be security protected according to the third key, or may be security protected according to the above-mentioned first key, which is determined (derived) based on 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 physical cell identity (PCI) of the target cell and frequency 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 obtain the target cell information 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 the embodiment of the present application.

In the communication method shown in the embodiment of FIG. 4, through the above security mechanism, the second access network device can perform a security activation and reconfiguration process on the terminal device through the first access network device, and remove the terminal device from the first The network access device switches to the second access network device to reduce the delay of the terminal device accessing the network.

For the way in which the terminal device sends the advance measurement report before message 4, the embodiments of the present application provide 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 the 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 the random access resource may include random access preamble information; or, the configuration information of the random access resource may include random access time domain resource information; or, the configuration information of the random access resource may include random access Incoming frequency domain resource information; or, the configuration information of the random access resource may include random access preamble information on the random access frequency domain resource, that is, the configuration information of the random access resource includes random access frequency resource information And random access preamble information; or, the configuration information of the random access resource may include random access preamble information on the random access time domain resource, that is, the configuration information of the random access resource includes random access time Domain resource information and random access preamble code information; or, the configuration information of the random access resource may include a random access preamble code on a random access time domain resource and a random access frequency domain resource, that is, a random access resource The configuration information includes random access time domain resource information, random access frequency resource information, and random access preamble information. Optionally, in the 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 a configuration of the random access time domain resource, where the configuration of the random access time domain resource may be, for example, Including the configuration of frames, symbols, slots, etc.

Optionally, in the 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. Wherein, the configuration of the random access frequency domain resources may include the configuration of bandwidth, resource blocks, etc., for example.

Optionally, in the 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, the preamble.

It can be understood that S501 is an optional step, that is, 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 the predefined random access resource.

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

It can be understood that the terminal device sending the preamble to the access network device may also be referred to as message 1 (message 1). 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 be sent, the terminal device may send a 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 based on the random access preamble information.

Here, the information of the random access preamble may be any one or more of the following: random access preamble itself, time domain resource information used to send the random access preamble, and used to send the random access preamble Frequency domain resource information. If the access network device learns that the information of the random access preamble is consistent with 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 terminal device has to be sent Advance measurement report, execute 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 the The terminal device has no advance measurement report to be sent, and it is processed according to the normal process. Among them, the information of the random access preamble and the random access resource configured by the access network device or the pre-defined advance measurement report may be the information of the random access preamble belonging to the configuration of the access network device or the predefined random 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 to the terminal device through a random access response (message 2), for example, uplink grant resource information. 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 upstream scheduling information of the advance measurement report and the upstream 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 advance measurement reports.

S505: The terminal device measures the 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 (also can be understood as accompanied by message 3) according to the uplink scheduling information, or With message 3, advance measurement report is sent.

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

S506, indicating to the access network device that the advance measurement report has not sent complete information.

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, the advance measurement report is sent completely, that is, the terminal device cannot send the advance measurement report all at once , The terminal device may indicate to the access network device that the advance measurement report does not send complete information. It can be understood that the information indicating that the advance measurement report is not completely transmitted may be implemented in different ways: for example, the indication information indicates whether the advance measurement report is completely transmitted, which may be indicated by 1 bit of information (for example, "0" indicates The advance measurement report is sent completely, "1" means that the advance measurement report is not sent completely); or, the corresponding indication information can be sent only when the advance measurement report is not sent completely, if there is no corresponding indication information, it means advance measurement The report is completely sent; alternatively, the corresponding indication information may be sent only when the advance measurement report is completely sent. If there is no corresponding indication information, it means that the advance measurement report is not completely sent.

Optionally, the above indication information may be sent through a physical uplink control channel, or may be carried in an advance measurement report, which is not limited in this embodiment of the present application, as long as the access network device can learn whether the advance measurement report is completely sent, thereby Just make the appropriate actions.

It should be noted that the communication method of the embodiment shown in FIG. 5 can be applied to terminal devices in an inactive state, terminal devices in an idle state, and terminal devices in which wireless link re-establishment occurs, 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 in this application, or may be combined with other embodiments of this application. For example, the communication method shown in FIG. 5 can be combined with the communication method shown in FIG. 3 or FIG. 4 for sending the advance measurement report of the communication method shown in FIG. 3 or FIG. 4, at this time, shown in FIG. 5 Is the first access network device.

The communication method in the embodiment shown in FIG. 5 enables the terminal device to quickly report the measurement report, enables the serving base station to perform mobility-related configuration faster, and improves the data transmission experience of the terminal device.

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

S601. The first node sends a message A to the 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, AMF or MME. The message A is a message for sending non-access stratum signaling of the terminal device to the core network node, for example, it may be an initial user equipment 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 establishment request (initial context setup).

In the prior art, the first node sends a response message of message B to the core network node, for example, an initial context establishment response (initial context setup response). In the embodiment of the present application, after S602, the response of message B is not sent immediately The message 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, please refer to the relevant description at S301, which will not be repeated here.

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

It can be understood that the sequence of S603, S601, and S602 is only an example, and this embodiment of the present application is not limited thereto. S603 may be before S601, or S603 may be after S601 and before S602.

S604: The first node sends a request to the second node to add the second node to provide services for the terminal device.

Here, the second node may also be called a second base station or a secondary base station or a secondary node (SN). Optionally, the request for adding a 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 the second node to add by other methods.

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 add request response (S-Node addition request), which is used to let the first node know that the second node can provide the terminal device with service. The response sent by the second node to the first node may include resource configuration information allocated by the second node to the terminal device for 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 secondary node addition request rejection (S-Node addition request). It is used to let 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.

Among them, the message C is used for RRC reconfiguration, for example, it may be called an RRC reconfiguration message.

Optionally, 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 receiving 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 message C to the first node.

Correspondingly, the first node receives the response message of the message C sent by the terminal device, and 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 completion message.

S608: The first node sends a message D to the core network node.

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

In the embodiment of the present application, by configuring the multi-connection configuration for the terminal device early 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 of the advance measurement report and the sending method, reference may be made to the related description of the foregoing embodiment.

Wherein, the terminal device may be a terminal device in a deactivated state or a terminal device during a radio link failure recovery process. The access network device A may also be called 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 obtain the context of the terminal device.

After the access network device A obtains the pre-measurement report, it determines whether to request the context of the terminal device A. For example, the access device A may determine that the access network device needs to be replaced according to the cell load or other factors, and select an appropriate target connection according to the measurement report. If the network access device can find a suitable target access network device, it requests 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 The network access device is an access network device different from the access network device A and the access network device B.

When the target access network device is the same access network device as access network device B: While requesting to obtain the context of the terminal device, access network device A will also send the target to access network device B The identification information of the cell, optionally, may also send the measurement result related to the access network device B to the access network device.

The access network device B is an access network device that stores the context of the terminal device A. For example, for the terminal device A in the deactivated state, the access network device B may be an access network device that configures the terminal device A to enter the deactivated state, and the access network device B may also be called a source access network device or an anchor connection. The network access device; or, for the terminal device during the wireless link failure recovery process, the access network device B may be the access network device where the terminal device A fails when the wireless link fails, and the access network device B may also be called It is the source access network device.

Optionally, the access network device B may also be called a fourth access network device.

In a possible manner, the message E may be a user equipment context request (retrieval UE context 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 the next hop linking counter (NCC) to the access network device A.

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

(1) For the deactivated scenario, 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 of wireless link failure recovery, 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 terminal device A in the access network NCC not used by the device B (may also be referred to as NCC not used by the terminal device). For example, if there is an NCC in the access network device B that is not used by the terminal device A, the access network device B feeds back to the access network device A that the NCC is not used by the terminal device A. There is no NCC not used by the terminal device A, and the access network device B feeds back to the access network device A the NCC used by the terminal device A in the access network device B. 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 for 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. At this time, S702 may not be executed. Optionally, in the case where 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 acquiring terminal device context request response message. It can be understood that the name of the message for sending the NCC is not limited in the embodiment of the present application.

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 a key corresponding to terminal device A stored in 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: the physical cell identity of the cell and frequency point information.

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

S705. The target access network device replies to the access network device A with a handover response.

Among them, through S704 and S705, the handover preparation is completed. It should be noted that S704 and S705 are optional steps, that is, S704 and S705 may not be executed or do not exist, then S706 is executed after S703. For example, when the target access network device is the same access network device as access network device A or access network device B, S704 and S705 need not be performed.

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

Among them, the message 4 includes target cell information. The target cell information includes at least one of the following: the physical cell identifier of the target cell and the frequency information of the target cell. Optionally, the message 4 may also include reserved non-contention random access resource configuration information of the target cell. Further, the message 4 may also include information for determining the key B and/or the second security algorithm. The information for determining the key B may include NCC. Alternatively, 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 a 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. At this time, the terminal device A adopts the relevant information in the saved context by default.

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

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

In the embodiment of the present application, during the process of connection restoration 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.

An embodiment of the present application also provides a communication method. As shown in FIG. 8, it 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 target cell, which is used by the access network device B to identify the target access network device and/or target cell.

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

Among them, the sixth message is a message for realizing a handover request.

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

Wherein, the sixth message carries the target key (the key used during 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 It belongs to the cell of the access network device A) to determine the first key; then the access network device B determines the target key based on the first key and the target cell information.

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

S804. The target access network device replies to the access network device B with 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.

Wherein, 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 terminal device A to determine the target key and/or target security algorithm. The information for determining the target key may include the target NCC.

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

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

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

It can be understood that, in the above embodiments, the methods and/or steps implemented by the terminal device may also be implemented by components (such as chips or circuits) that can be used for the terminal device, and by the access network device (such as the first access Network equipment, second access network equipment, access network equipment A, or access network equipment B) The methods and/or steps implemented may also be implemented by components that can be used for access network equipment, by the core network equipment or the core network The method and/or steps implemented by the node may also be implemented by components that can be used in the core network device or the core network node.

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 merely examples, and other operations may also be performed in the embodiments of the present application or Deformation of various operations. In addition, each step may be executed in a different order presented in the embodiments of the present application, and it may not be necessary to perform all operations in the embodiments of the present application.

The above mainly introduces the solutions provided by the embodiments of the present application from the perspective of interaction between various network elements. Correspondingly, the embodiments of the present application also provide a communication device, which is used to implement the above various methods. The communication device may be the terminal device involved in the above method embodiments, or the device containing the above terminal device, or a component that can be used for the terminal device; or, the communication device may be the device involved in each of the above method embodiments Access network equipment (such as the first access network equipment, the second access network equipment, the access network equipment A, or the access network equipment B), or the device containing the above access network equipment, or it can be used to connect A component of a network access device; alternatively, the communication device may also be a core network node involved in the above method embodiments, or a device including the above core network node, or a component that can be used for a core network node. It can be understood that, in order to realize the above-mentioned functions, the communication device includes a hardware structure and/or a software module corresponding to each function. Those skilled in the art should be easily aware that, in conjunction with the exemplary units and algorithm steps described in the embodiments disclosed herein, the present application can be implemented in the form of hardware or a combination of hardware and computer software. Whether a function is performed by hardware or computer software driven hardware depends on the specific application of the technical solution and design constraints. Professional technicians can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

The embodiments of the present application may divide the functional modules of the communication apparatus 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 integrated modules can be implemented in the form of hardware or software function modules. It should be noted that the division of the modules in the embodiments of the present application is schematic, and is only a division of logical functions. In actual implementation, there may be another division manner.

For example, taking the communication device as the first access network device in the foregoing method embodiment as an example. 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 may exist independently in the form of an interface, or may be integrated into a transceiver module. The transceiver module may also be called a transceiver unit to implement sending and/or receiving functions, for example, it may be a transceiver circuit, a transceiver , Transceiver or communication interface.

Wherein, all relevant content of each step involved in the above method embodiments can be referred to the function description of the corresponding function module. The following is an example, and the details are not repeated here.

For example, the sending module 901 may be used to send a first message to a second access network device, where the first message may refer to the description of the foregoing embodiment.

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

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

Optionally, the access network device 90 may further include a processing module 903, configured to determine the foregoing second access network device according to the measurement report and 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 also 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 the response message of the security mode command message.

Optionally, the receiving module 902 may also be used 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 by 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 perform random access The information of the preamble determines that the terminal device has an advance measurement report to be sent. The sending module 901 may be used to send a random access response (message 2) to the terminal device, where the random access response includes Measurement report uplink scheduling information. 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 that execute one or more software or firmware programs, an integrated logic circuit, and/or other devices that can provide the above functions. In a simple embodiment, those skilled in the art may think that the communication device 90 may 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 foregoing 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 performed by calling the computer execution instruction stored in the memory 202 by the processor 201 in the access network device 20 shown in FIG. 2 achieve. Alternatively, the functions/implementation processes of the sending module 901 and the receiving module 902 in FIG. 9 can 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. The process can be implemented by the processor 201 described in FIG. 2.

Since the communication device 90 provided by this embodiment can execute the above-mentioned communication method, the technical effects that can be obtained can refer to the above-mentioned method embodiments, which will not be repeated here.

For example, taking the communication device as the second access network device in the foregoing method embodiment as an example. FIG. 10 shows a schematic structural diagram of a communication device 1000. The communication device 1000 includes a receiving module 1001 and a sending module 1002. The receiving module 1001 and the sending module 1002 may exist independently in the form of an interface, or may be integrated as a transceiver module. The transceiver module may also be called a transceiver unit to implement a transmission and/or reception function, for example, it may be a transceiver circuit, a transceiver , Transceiver or communication interface.

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

The sending module 1002 may be used 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 about the first key.

Optionally, the sending module 1002 may also 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 used to receive the second response message from the terminal device.

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

For the related description of each message, reference may be made to the related description in the method embodiment, and no more details are provided here.

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

In a possible manner, the function/implementation process of the receiving module 1001 and the sending module 1002 in FIG. 10 can be performed by calling the computer execution instruction stored in the memory 202 by the processor 201 in the access network device 20 shown in FIG. 2 achieve. 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, take the communication device as the terminal device in the above method embodiment as an example. 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 may exist independently in the form of an interface, or may be integrated into a transceiver module. The transceiver module may also be called a transceiver unit to implement a sending and/or receiving function. For example, it may be a transceiver circuit or a transceiver. , Transceiver or communication interface.

For example, the receiving module 1102 may be used to receive a security mode command message from the first access network device, where 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. The security mode command message includes the information of the first key, which is determined according to the initial key determined by the core network, the physical cell identity of the source cell, and the frequency of the source cell, where the source cell Belongs to the first access network device.

The sending module 1101 is used to send a response message of the security mode command message, and the response message of 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 used to send a measurement report and service information to the first access network device.

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

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 to send the security to the second access network device Response message for mode command message. In a possible manner, when the first indication information is received, the sending module 1101 sends a response message of the security mode command message to the second access network device.

In a possible manner, in a case where the advance measurement report is sent by 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 It can be used to receive a random access response (message 2) from the first access network device, where the random access response includes uplink scheduling information for the advance measurement report, and the sending module 1101 is used to receive 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 that execute one or more software or firmware programs, an integrated logic circuit, and/or other devices that can provide the above functions. In a simple embodiment, those skilled in the art may think that the communication device 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 call the computer stored in the memory 302 to execute instructions, so that the terminal device 30 executes the communication method in the foregoing method embodiment.

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

An embodiment of the present application further provides a communication device, which is used to implement related functions/implementation processes of the first node in the foregoing method embodiments. For example, the communication device may include a sending module for sending a message to the core network node for transmitting non-access layer 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, after the RRC reconfiguration of the terminal device is completed, 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. It should be noted that, the sending module and the receiving module may exist independently in the form of an interface, or may be integrated into a transceiver module. The transceiver module may also be called a transceiver unit to implement a sending and/or receiving function, for example, a transceiver circuit. , Transceiver, transceiver or communication interface.

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

An embodiment of the present application further provides a communication apparatus, including a module for implementing related functions/implementation processes corresponding to the access network device A of 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, and details are not described here.

An embodiment of the present application further provides a communication apparatus, including a module for implementing related functions/implementation processes corresponding to the access network device B of 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, and details are not described here.

An embodiment of the present application further provides a communication apparatus, including a module for implementing related functions/implementation processes corresponding to the target access network device of 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, and details are not described here.

An embodiment of the present application further provides a communication apparatus, including a module for implementing related functions/implementation processes corresponding to the terminal device A of 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, and details are not described here.

Optionally, an embodiment of the present application further provides a communication device (for example, the communication device may be a chip or a chip system), and the communication device includes a processor for implementing the method in any of the foregoing method embodiments. In a 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 device to perform the method in any of the above method embodiments. Of course, the memory may 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 the embodiments of the present application.

In the above embodiments, it can 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, a dedicated computer, a computer network, or other programmable devices. The computer instructions may be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another computer-readable storage medium, for example, the computer instructions may be from a website site, computer, server or data center Transmission to another website, computer, server or data center via wired (such as coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (such as infrared, wireless, microwave, etc.). The computer-readable storage medium may be any available medium that can be accessed by a computer or a data storage device including one or more servers and data centers that can be integrated with the medium. The usable medium may be a magnetic medium (for example, a floppy disk, a hard disk, a magnetic tape), an optical medium (for example, a DVD), or a semiconductor medium (for example, a solid state disk (SSD)) or the like. In the embodiment of the present application, the computer may include the aforementioned device.

Although the present application has been described in conjunction with various embodiments herein, in the process of implementing the claimed application, those skilled in the art can understand and understand by looking at the drawings, the disclosure, and the appended claims Other changes to the disclosed embodiments are implemented. In the claims, the word "comprising" does not exclude other components or steps, and "a" or "one" does not exclude a plurality. A single processor or other unit may fulfill several functions recited in the claims. Certain measures are recited in mutually different dependent claims, but this does not mean that these measures cannot be combined to produce good results.

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

Claims

A communication method, characterized in that the method includes:

The first access network device sends a first message to the second access network device, where the first message includes identification information of the terminal device, a reason why the terminal device initiates establishment of a radio resource control RRC connection, and the terminal device selection Identification information of the public land mobile network PLMN;

The first access network device receives a response message of the first message from the second access network device.
The method of claim 1, before the first access network device sends the first message to the second access network device, further comprising:

The first access network device receives the measurement report and service information from the terminal device;

The first access network device determines the second access network device according to the measurement report and the service information.
The method according to claim 2, wherein the service information includes registered target core network node identification information and/or single network slice selection support information list.
The method according to claim 3, wherein the first access network device determining the second access network device based on the measurement report and the service information includes: the first access network device It is determined according to the service information that the demand for the terminal device is not supported, and the second access network device is selected according to the measurement report; wherein, the requirement for determining that the terminal device is not supported includes:

It is determined that the target core network node is congested or the target core network node does not support the terminal device access; and/or, the slice is congested or the slice does not support the terminal device access.
The method according to any one 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 the response message of the first message includes a security mode command message And the content of the RRC reconfiguration message.
The method according to claim 5, further comprising: the first access network device sending the content of the security mode command message and the content of the RRC reconfiguration message to the terminal device.
The method according to claim 5 or 6, wherein the content of the RRC reconfiguration message is security protection according to an initial key and a security algorithm, wherein the initial key comes from the core network.
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 based on data from the core network Is determined by the initial key and the information of the 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 of the source cell.
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 The first key indication information or the first key. The first key indication information is used to instruct the terminal device to determine the first key according to the initial key and the information of the source cell.
The method according to any one 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 indicate The terminal device sends a response message of the security mode command message to the second access network device.
The method according to 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 follow the The terminal device receives the response message of the security mode command message.
The method according to claim 6, further comprising:

A response message of a security mode command message is received from the terminal device, and the response message of the security mode command message is a response to the content of the security mode command message received from the first access network device.
The method according to any one of claims 1-12, wherein the measurement report is an advance measurement report.
The method according to claim 13, wherein in the case that the advance measurement report is received before the conflict resolution message, the method further comprises:

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

Determine, in accordance with the information of the random access preamble, an advanced measurement report to be sent by the terminal device;

Send a random access response (message 2) to the terminal device, where the random access response includes uplink scheduling information for the advance measurement report.
The method according to any one of claims 1 to 14, wherein, in the case where the terminal device is an inactive terminal device, the identification information of the terminal device includes a deactivated wireless network temporary identification

I-RNTI; or,

In the case where the terminal device is an idle terminal device, the identification information of the terminal device includes a mobile user identification.
A communication method, characterized in that it includes:

Receiving 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, and the security mode command message includes the first password Key information, the first key is determined based on the initial key determined by the core network and the information of the source cell, where the source cell belongs to the first access network device, and the source cell information includes At least one of the physical cell identifier of the source cell and the frequency of the source cell;

Sending a response message of the security mode command message, wherein the response message of the security mode command is securely protected according to the first key.
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 key, the physical cell identifier of the source cell, and the frequency of the source cell determine the first key.
The method according to claim 16 or 17, further comprising:

Sending a second message to the second access network device indicating that radio resource control RRC reconfiguration is completed, wherein the second message is securely protected according to a second key, and the second key is based on Determined by the first key and the information of the target cell, the target cell belongs to the second access network device, and the information of the target cell includes at least one of a physical cell identifier of the target cell and a frequency of the target cell Species.
The method according to any one of claims 16 to 18, further comprising: receiving first indication information from the first access network device, wherein the first indication information is used to indicate to the The second access network device sends a response message of the security mode command message;

The response message for sending the security mode command message includes: sending a response message for the security mode command message to the second access network device.
The method according to any one of claims 16 to 19, wherein the response message to send the security mode command message comprises: sending the security mode command message to the first access network device Response message.
The method according to any one of claims 16-20, wherein before receiving the security mode command message from the first access network device, the method further comprises: sending an advance measurement report to the first access network device.
The method according to claim 21, wherein in the case where the advance measurement report is sent before the conflict resolution message, the method further comprises:

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

Receiving a random access response (message 2) from the first access network device, where the random access response includes uplink scheduling information for the advance measurement report;

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

Sending the advance measurement report to the first access network device according to the uplink scheduling information.
The method according to claim 22, further comprising: indicating to the first access network device that the advance measurement report does not send complete information.
A communication device, characterized by being used to implement the method according to any one of claims 1 to 15.
A communication device, characterized by being used to implement the method of any one of claims 16 to 23.
A computer-readable storage medium, characterized by comprising instructions which, when executed, cause a communication device to perform the method of any one of claims 1-15, or cause the communication device to execute The method according to any one of claims 16-23.
A communication system characterized by comprising the communication device according to claim 24 and the communication device according to claim 25.
A computer program product containing instructions, characterized in that, when it is executed, the method according to any one of claims 1-23 is executed.