CN114073166A

CN114073166A - Method, device and equipment for recovering transmission

Info

Publication number: CN114073166A
Application number: CN202080048656.4A
Authority: CN
Inventors: 戴振华; 常俊仁; 贾长青; 程明开
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2020-01-02
Filing date: 2020-01-02
Publication date: 2022-02-18
Also published as: WO2021134763A1

Abstract

The application relates to a method, a device and equipment for recovering transmission. And determining the uplink service, wherein the communication between the terminal equipment and the MCG and the communication between the terminal equipment and the SCG are suspended. And determining whether the uplink service is transmitted through the SCG, and when the uplink service is transmitted through the SCG, sending an RRC recovery request message to a main network device of the terminal device, wherein the RRC recovery request message is used for requesting to recover the communication with the SCG. And determining whether to recover the communication with the SCG according to the uplink service, and reducing unnecessary SCG recovery processes as much as possible so as to reduce transmission overhead caused by recovering the communication between the terminal equipment and the SCG and make the recovery of the communication between the terminal equipment and the SCG more effective.

Description

Method, device and equipment for recovering transmission

Technical Field

The present application relates to the field of mobile communications technologies, and in particular, to a method, an apparatus, and a device for recovering transmission.

Background

In the 5th generation (5G) network, the terminal device may establish dual connectivity, that is, the terminal device may communicate with two base stations simultaneously, where one of the two base stations serves as a primary base station of the terminal device and the other serves as a secondary base station of the terminal device. The cell group provided by the master base station may be referred to as a Master Cell Group (MCG), and the cell group provided by the secondary base station may be referred to as a Secondary Cell Group (SCG). For a terminal device in a dual connectivity state and in a Radio Resource Control (RRC) connected state, when the terminal device has no uplink traffic and no downlink traffic, the base station may configure the terminal device to enter a suspended state, for example, the main base station may configure the terminal device to enter the suspended state. When the terminal equipment is in the suspended state, the terminal equipment cannot communicate with the MCG and cannot communicate with the SCG. But still able to detect system messages or paging messages, etc. from the MCG.

When the terminal device has uplink traffic, it may resume communication with the MCG, which is also discussed at present. But the terminal device may only need to communicate with the MCG and not the SCG after resuming communication. In this case, it is an unnecessary procedure for the terminal device to resume communication with the SCG, and an unnecessary increase in transmission overhead is also caused.

Disclosure of Invention

The embodiment of the application provides a method, a device and equipment for recovering transmission, which are used for saving transmission overhead.

In a first aspect, a first method for resuming transmission is provided, the method including: determining an uplink service, wherein the communication between the terminal equipment and the master cell group MCG and the communication between the terminal equipment and the auxiliary cell group SCG are suspended; determining whether the uplink service is transmitted through an SCG; and when the uplink service is transmitted through the SCG, sending an RRC recovery request message to the main network equipment of the terminal equipment, wherein the RRC recovery request message is used for requesting to recover the communication with the SCG.

The method may be performed by a first communication device, which may be a communication apparatus or a communication device, e.g. a chip, capable of supporting the communication apparatus to implement the functionality required for the method. Illustratively, the first communication device is a terminal device, or a chip provided in the terminal device for implementing a function of the terminal device, or another component for implementing a function of the terminal device. In the following description, the first communication device is taken as an example of a terminal device.

In the embodiment of the present application, when it is determined that the uplink service is transmitted through the SCG, the communication between the terminal device and the SCG is resumed, and if the uplink service is not transmitted through the SCG, the communication between the terminal device and the SCG may not need to be resumed. In this way, the transmission overhead due to restoring the communication between the terminal device and the SCG can be reduced, and the restoration of the communication between the terminal device and the SCG can also be made more efficient.

In an optional implementation manner, determining whether the uplink service is transmitted through the SCG includes:

and determining whether a data radio bearer for transmitting the uplink service belongs to the SCG, wherein when the data radio bearer belongs to the SCG, the uplink service is transmitted through the SCG, otherwise, the uplink service is not transmitted through the SCG.

Wherein, a DRB belongs to SCG may mean that the DRB uses LCH of SCG. Since the uplink traffic is transmitted through the DRB, if the DRB for transmitting the uplink traffic belongs to the SCG, it may indicate that the uplink traffic is to be transmitted through the SCG, and if the DRB for transmitting the uplink traffic does not belong to the SCG, it may indicate that the uplink traffic is not to be transmitted through the SCG. By determining whether the uplink service is transmitted through the SCG or not in this way, the determination result can be more accurate.

In an optional implementation manner, the data radio bearer corresponding to the identifier of the PDU session corresponding to the uplink service is a data radio bearer used for transmitting the uplink service.

Uplink traffic may be transmitted through PDU sessions, for example, an uplink traffic may correspond to one PDU session or multiple PDU sessions, each PDU session corresponds to a corresponding DRB, then an uplink traffic may correspond to one or multiple DRBs, and the one or multiple DRBs may all belong to an MCG, or all belong to an SCG, or there may be a part of DRBs belonging to an MCG and another part of DRBs belonging to an SCG. The DRB is used for transmitting the uplink service, that is, the DRB carrying the PDU session corresponding to the uplink service. And the DRB carrying the PDU session corresponding to the uplink service, that is, the DRB corresponding to the identification of the PDU session corresponding to the uplink service. Because the PDU session corresponding to the uplink service can be determined by the terminal device, the corresponding DRB is determined through the PDU session corresponding to the uplink service, so that the determined DRB can be more accurate.

In an optional implementation manner, the uplink service includes an uplink service to be initiated, or includes all uplink services configured by the main network device for the terminal device.

For example, if the terminal device initiates an uplink service by itself, the NAS layer of the terminal device may identify the uplink service to be initiated by the terminal device, and the uplink service determined by the terminal device may include the uplink service to be initiated by the terminal device; or, if the terminal device receives the paging message, the NAS layer of the terminal device may not be able to identify the uplink service that needs to be recovered specifically, in this case, the uplink service determined by the terminal device may include all uplink services configured by the network device (e.g., the main network device) for the terminal device, so as to avoid missing part of the uplink services, and avoid as much as possible that some uplink services cannot be performed because the communication with the SCG is not recovered. In either case, the terminal device may determine the uplink traffic.

In an optional embodiment, the RRC resume request message is further used to request to resume communication with the MCG.

It can be understood that, if the terminal device determines that the uplink service is transmitted through the SCG, the RRC recovery request message sent by the terminal device may be used to request to recover the communication between the terminal device and the MCG and to request to recover the communication between the terminal device and the SCG; alternatively, if the terminal device determines that the uplink traffic is not transmitted through the SCG, the terminal device may send an RRC recovery request message to the main network device, where the RRC recovery request message is used to request recovery of communication between the terminal device and the MCG, but not used to request recovery of communication between the terminal device and the SCG.

In an optional embodiment, the method further comprises:

receiving an RRC recovery message from the primary network device, the RRC recovery message to resume communication with the SCG.

If the RRC recovery request message sent by the terminal device is used to request to recover the communication between the terminal device and the MCG and request to recover the communication between the terminal device and the SCG, the RRC recovery message may be used to recover the communication between the terminal device and the MCG and recover the communication between the terminal device and the SCG; alternatively, if the RRC recovery request message sent by the terminal device is for requesting recovery of communication between the terminal device and the MCG, but not for requesting recovery of communication between the terminal device and the SCG, the RRC recovery message may be for recovering communication between the terminal device and the MCG, but not for recovering communication between the terminal device and the SCG.

In a second aspect, a second method for recovering transmission is provided, the method comprising: receiving an RRC recovery request message from a terminal device, wherein the recovery request message is used for requesting to recover the communication between the terminal device and an SCG (cell group gateway), and an uplink service of the terminal device is transmitted through the SCG; and sending an RRC recovery message to the terminal equipment, wherein the RRC recovery message is used for recovering the communication between the terminal equipment and the SCG.

The method may be performed by a first communication device and the second communication device may be a communication apparatus or a communication device, e.g. a chip, capable of supporting the communication apparatus to perform the functions required by the method. Illustratively, the second communication device is a network device, or a chip provided in the network device for implementing the functions of the network device, or other components for implementing the functions of the network device. In the following description, the second communication device is taken as an example of a network device.

In an optional embodiment, the method further comprises:

and sending an RRC recovery message to the terminal equipment, wherein the RRC recovery message is used for recovering the communication with the SCG.

With regard to the technical effects brought about by the second aspect or various alternative embodiments, reference may be made to the introduction of the technical effects of the first aspect or the respective embodiments.

In a third aspect, a communication device is provided, for example, the communication device is the first communication device as described above. The first communication device is configured to perform the method of the first aspect or any possible implementation. In particular, the first communication device may comprise means for performing the method of the first aspect or any possible implementation, for example comprising a processing means and a transceiver means. For example, the transceiver module may include a transmitting module and a receiving module, and the transmitting module and the receiving module may be different functional modules, or may also be the same functional module, but can implement different functions. Illustratively, the first communication device is a communication device, or a chip or other component provided in the communication device. Illustratively, the communication device is a terminal device. In the following, the first communication apparatus is exemplified as a terminal device. For example, the transceiver module may be implemented by a transceiver, and the processing module may be implemented by a processor. Alternatively, the sending module may be implemented by a sender, the receiving module may be implemented by a receiver, and the sender and the receiver may be different functional modules, or may also be the same functional module, but may implement different functions. If the first communication means is a communication device, the transceiver is implemented, for example, by an antenna, a feeder, a codec, etc. in the communication device. Alternatively, if the first communication device is a chip disposed in the communication apparatus, the transceiver (or the transmitter and the receiver) is, for example, a communication interface in the chip, and the communication interface is connected with a radio frequency transceiving component in the communication apparatus to realize transceiving of information through the radio frequency transceiving component. In the introduction procedure of the third aspect, the first communication device is a terminal device, and the processing module and the transceiver module are taken as examples for introduction. Wherein the content of the first and second substances,

the processing module is used for determining uplink service, wherein the communication between the terminal equipment and the master cell group MCG and the communication between the terminal equipment and the auxiliary cell group SCG are suspended;

the processing module is further configured to determine whether the uplink service is transmitted through an SCG;

the transceiver module is configured to send an RRC recovery request message to a master network device of the terminal device when the processing module determines that the uplink service is transmitted through the SCG, where the RRC recovery request message is used to request recovery of communication with the SCG.

In an optional implementation manner, the processing module is configured to determine whether the uplink service is transmitted through the SCG by:

In an optional embodiment, the transceiver module is further configured to receive an RRC recovery message from the primary network device, where the RRC recovery message is used to resume communication with the SCG.

With regard to the technical effects brought about by the third aspect or the various alternative embodiments, reference may be made to the introduction of the technical effects of the first aspect or the respective embodiments.

In a fourth aspect, a communication device is provided, for example, the communication device is the second communication device as described above. The second communication device is configured to perform the method of the second aspect or any possible embodiment. In particular, the second communication device may comprise means for performing the method of the second aspect or any possible embodiment, for example comprising a processing means and a transceiver means. For example, the transceiver module may include a transmitting module and a receiving module, and the transmitting module and the receiving module may be different functional modules, or may also be the same functional module, but can implement different functions. Illustratively, the second communication device is a communication device, or a chip or other component provided in the communication device. Illustratively, the communication device is a network device. In the following, it is exemplified that the second communication device is a network device, for example, the network device is the above-mentioned main network device. For example, the transceiver module may be implemented by a transceiver, and the processing module may be implemented by a processor. Alternatively, the sending module may be implemented by a sender, the receiving module may be implemented by a receiver, and the sender and the receiver may be different functional modules, or may also be the same functional module, but may implement different functions. If the second communication means is a communication device, the transceiver is implemented, for example, by an antenna, a feeder, a codec, etc. in the communication device. Alternatively, if the second communication device is a chip disposed in the communication apparatus, the transceiver (or the transmitter and the receiver) is, for example, a communication interface in the chip, and the communication interface is connected with a radio frequency transceiving component in the communication apparatus to realize transceiving of information through the radio frequency transceiving component. In the introduction process of the fourth aspect, the second communication device is a network device, and the processing module and the transceiver module are taken as examples for introduction. Wherein the content of the first and second substances,

the receiving and sending module is configured to receive an RRC recovery request message from a terminal device, where the recovery request message is used to request recovery of communication between the terminal device and an auxiliary cell group SCG, and an uplink service of the terminal device is transmitted through the SCG;

the transceiver module is further configured to send an RRC recovery message to the terminal device, where the RRC recovery message is used to recover communication between the terminal device and the SCG.

In an optional implementation manner, the processing module is configured to determine that a recovery request message is used to request to recover communication between the terminal device and the secondary cell group SCG.

In an optional implementation manner, the transceiver module is further configured to send an RRC recovery message to the terminal device, where the RRC recovery message is used to recover communication with the SCG.

With regard to the technical effects brought about by the fourth aspect or the various alternative embodiments, reference may be made to the introduction of the technical effects of the second aspect or the respective embodiments.

In a fifth aspect, a communication device is provided, for example a first communication device as described above. The communication device includes a processor. Optionally, a memory may also be included for storing the computer instructions. The processor and the memory are coupled to each other for implementing the method described in the first aspect or the various possible embodiments above. Alternatively, the first communication device may not include the memory, and the memory may be located outside the first communication device. Optionally, the first communication device may further include a communication interface for communicating with other devices or apparatuses. The processor, the memory and the communication interface are coupled to each other for implementing the method described in the first aspect or the various possible embodiments. The processor, for example, when executing the computer instructions stored by the memory, causes the first communication device to perform the method of the first aspect or any one of the possible embodiments described above. Illustratively, the first communication device is a communication device, or a chip or other component provided in the communication device. Illustratively, the communication device is a terminal device.

Wherein, if the first communication means is a communication device, the communication interface is implemented, for example, by a transceiver (or a transmitter and a receiver) in the communication device, for example, the transceiver is implemented by an antenna, a feeder, a codec, and the like in the communication device. Or, if the first communication device is a chip disposed in the communication apparatus, the communication interface is, for example, an input/output interface, such as an input/output pin, of the chip, and the communication interface is connected to a radio frequency transceiving component in the communication apparatus to implement transceiving of information through the radio frequency transceiving component.

A sixth aspect provides a communication device, for example a second communication device as described above. The communication device includes a processor. Optionally, a memory may also be included for storing the computer instructions. The processor and the memory are coupled to each other for implementing the method described in the second aspect or the various possible embodiments above. Alternatively, the second communication device may not include a memory, and the memory may be located outside the second communication device. Optionally, the second communication device may further include a communication interface for communicating with other devices or apparatuses. The processor, the memory and the communication interface are coupled to each other for implementing the method described in the second aspect or the various possible embodiments described above. The processor, for example, when executing the computer instructions stored by the memory, causes the second communication device to perform the method of the second aspect or any one of the possible embodiments described above. Illustratively, the second communication device is a communication device, or a chip or other component provided in the communication device. Illustratively, the communication device is a network device, such as the primary network device.

Wherein, if the second communication means is a communication device, the communication interface is implemented, for example, by a transceiver (or a transmitter and a receiver) in the communication device, for example, by an antenna, a feeder, a codec, etc. in the communication device. Or, if the second communication device is a chip disposed in the communication apparatus, the communication interface is, for example, an input/output interface, such as an input/output pin, of the chip, and the communication interface is connected to a radio frequency transceiving component in the communication apparatus to realize transceiving of information through the radio frequency transceiving component.

In a seventh aspect, there is provided a communication system comprising the communication apparatus of the third aspect or the communication apparatus of the fifth aspect, and comprising the communication apparatus of the fourth aspect or the communication apparatus of the sixth aspect.

In an eighth aspect, a computer-readable storage medium is provided, which is used for storing computer instructions, and when the computer instructions are executed on a computer, the computer is caused to execute the method of the first aspect or any one of the possible implementation manners.

In a ninth aspect, there is provided a computer readable storage medium for storing computer instructions which, when executed on a computer, cause the computer to perform the method of the second aspect or any one of the possible embodiments.

A tenth aspect provides a computer program product comprising instructions for storing computer instructions that, when executed on a computer, cause the computer to perform the method of the first aspect or any one of the possible implementations.

In an eleventh aspect, there is provided a computer program product comprising instructions for storing computer instructions which, when run on a computer, cause the computer to perform the method of the second aspect or any one of the possible embodiments described above.

In the embodiment of the application, whether to recover the communication with the SCG can be determined according to the uplink service, and unnecessary SCG recovery processes are reduced as much as possible, so that transmission overhead caused by recovering the communication between the terminal equipment and the SCG is reduced, and the recovery of the communication between the terminal equipment and the SCG is more effective.

Drawings

Fig. 1 is a schematic diagram of transmission channels among a terminal device, a main network device, an auxiliary network device, and a core network device in a dual-connection scenario;

fig. 2 is a flow chart of communication between a blind recovery terminal device and an SCG;

FIG. 3 is a flow chart for resuming communication between a terminal device and an SCG based on measurement results of the SCG;

fig. 4 is a schematic view of an application scenario according to an embodiment of the present application;

fig. 5 is a flowchart of a method for resuming transmission according to an embodiment of the present application;

fig. 6 is a schematic block diagram of a terminal device provided in an embodiment of the present application;

FIG. 7 is a schematic block diagram of a primary network device provided by an embodiment of the present application;

fig. 8 is a schematic block diagram of a communication device provided in an embodiment of the present application;

fig. 9 is another schematic block diagram of a communication device provided by an embodiment of the present application;

fig. 10 is a further schematic block diagram of a communication device provided in an embodiment of the present application;

fig. 11 is a further schematic block diagram of a communication device provided in an embodiment of the present application.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the embodiments of the present application will be described in further detail with reference to the accompanying drawings.

Hereinafter, some terms in the embodiments of the present application are explained to facilitate understanding by those skilled in the art.

1) Terminal equipment, including equipment providing voice and/or data connectivity to a user, in particular, including equipment providing voice to a user, or including equipment providing data connectivity to a user, or including equipment providing voice and data connectivity to a user. For example, may include a handheld device having wireless connection capability, or a processing device connected to a wireless modem. The terminal device may communicate with a core network via a Radio Access Network (RAN), exchange voice or data with the RAN, or interact with the RAN. The terminal device may include a User Equipment (UE), a wireless terminal device, a mobile terminal device, a device-to-device communication (D2D) terminal device, a vehicle-to-all (V2X) terminal device, a machine-to-machine/machine-type communication (M2M/MTC) terminal device, an internet of things (IoT) terminal device, a light terminal device (light UE), a subscriber unit (subscriber unit), a subscriber station (subscriber station), a mobile station (mobile station), a remote station (remote station), an access point (access point, AP), a remote terminal (remote), an access terminal (access terminal), a user terminal (user), a user agent (user), or the like. For example, mobile telephones (or so-called "cellular" telephones), computers with mobile terminal equipment, portable, pocket, hand-held, computer-included mobile devices, and the like may be included. For example, Personal Communication Service (PCS) phones, cordless phones, Session Initiation Protocol (SIP) phones, Wireless Local Loop (WLL) stations, Personal Digital Assistants (PDAs), and the like. Also included are constrained devices, such as devices that consume less power, or devices that have limited storage capabilities, or devices that have limited computing capabilities, etc. Examples of information sensing devices include bar codes, Radio Frequency Identification (RFID), sensors, Global Positioning Systems (GPS), laser scanners, and the like.

By way of example and not limitation, in the embodiments of the present application, the terminal device may also be a wearable device. Wearable equipment can also be called wearable smart device or intelligent wearable equipment etc. is the general term of using wearable technique to carry out intelligent design, develop the equipment that can dress to daily wearing, like glasses, gloves, wrist-watch, dress and shoes etc.. A wearable device is a portable device that is worn directly on the body or integrated into the clothing or accessories of the user. The wearable device is not only a hardware device, but also realizes powerful functions through software support, data interaction and cloud interaction. The generalized wearable smart device includes full functionality, large size, and can implement full or partial functionality without relying on a smart phone, such as: smart watches or smart glasses and the like, and only focus on a certain type of application functions, and need to be used in cooperation with other devices such as smart phones, such as various smart bracelets, smart helmets, smart jewelry and the like for monitoring physical signs.

The various terminal devices described above, if located on a vehicle (e.g., placed in or installed in the vehicle), may be considered to be vehicle-mounted terminal devices, which are also referred to as on-board units (OBUs), for example.

In this embodiment, the terminal device may further include a relay (relay). Or, it is understood that any device capable of data communication with a base station may be considered a terminal device.

In the embodiment of the present application, the apparatus for implementing the function of the terminal device may be the terminal device, or may be an apparatus capable of supporting the terminal device to implement the function, for example, a chip system, and the apparatus may be installed in the terminal device. In the embodiment of the present application, the chip system may be composed of a chip, and may also include a chip and other discrete devices. In the technical solution provided in the embodiment of the present application, a device for implementing a function of a terminal is taken as an example of a terminal device, and the technical solution provided in the embodiment of the present application is described.

2) Network devices, including, for example, Access Network (AN) devices, such as base stations (e.g., access points), may refer to devices in AN access network that communicate with wireless terminal devices over one or more cells over the air, or, for example, a network device in vehicle-to-all (V2X) technology is a Road Side Unit (RSU). The base station may be configured to interconvert received air frames and IP packets as a router between the terminal device and the rest of the access network, which may include an IP network. The RSU may be a fixed infrastructure entity supporting the V2X application and may exchange messages with other entities supporting the V2X application. The network device may also coordinate attribute management for the air interface. For example, the network device may include an evolved Node B (NodeB or eNB or e-NodeB) in a Long Term Evolution (LTE) system or an advanced long term evolution (LTE-a), or may also include a next generation Node B (gNB) in a 5th generation (5G) NR system (also referred to as NR system) or may also include a Centralized Unit (CU) and a Distributed Unit (DU) in a Cloud access network (Cloud RAN) system, which is not limited in the embodiments of the present application.

The network device may also include a core network device including, for example, an access and mobility management function (AMF) or a User Plane Function (UPF), etc. Since the embodiments of the present application mainly relate to access network devices, hereinafter, unless otherwise specified, all the network devices refer to access network devices.

In the embodiment of the present application, the apparatus for implementing the function of the network device may be a network device, or may be an apparatus capable of supporting the network device to implement the function, for example, a system on chip, and the apparatus may be installed in the network device. In the technical solution provided in the embodiment of the present application, a device for implementing a function of a network device is taken as an example of a network device, and the technical solution provided in the embodiment of the present application is described.

3) Dual Connectivity (DC).

In the LTE system, a terminal device supports simultaneous access to two network devices, which is called DC, where one network device is a primary network device and the other network device is a secondary network device. In the development and evolution process of the wireless communication system, an operator may deploy the NR system and the LTE system at the same time, and the terminal device also supports a network device that is accessed to the LTE system and a network device that is accessed to the NR system at the same time. Since LTE is also called evolved universal terrestrial radio access (E-UTRA), this access scheme is called evolved universal terrestrial radio access and new air interface dual connectivity (EN-DC). In the EN-DC mode, the network device of the LTE is a primary network device, and the network device of the NR is a secondary network device, and certainly along with the evolution of the system, a new air interface and an evolved universal terrestrial radio access dual connectivity (NE-DC) may also be supported in the future, that is, the network device of the NR is a primary network device, and the network device of the LTE is a secondary network device. Since terminal devices of both EN-DC and NE-DC will have access to network devices of two different radio access technologies, these DC modes may also be referred to collectively as multi-RAT dual connectivity (MR-DC).

4) "at least one" means one or more, "a plurality" means two or more. "and/or" describes the association relationship of the associated objects, meaning that there may be three relationships, e.g., a and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone, wherein A and B can be singular or plural. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship. "at least one of the following" or similar expressions refer to any combination of these items, including any combination of the singular or plural items. For example, at least one (one) of a, b, or c, may represent: a, b, c, a-b, a-c, b-c, or a-b-c, wherein a, b, c may be single or multiple.

And, unless stated to the contrary, the embodiments of the present application refer to the ordinal numbers "first", "second", etc., for distinguishing a plurality of objects, and do not limit the sequence, timing, priority, or importance of the plurality of objects. For example, the first information and the second information are only for distinguishing different signaling, and do not indicate the difference in content, priority, transmission order, importance, or the like of the two information.

Having described some of the concepts related to the embodiments of the present application, the following describes features of the embodiments of the present application.

In a 5G network, the terminal device may establish a dual connection, i.e. the terminal device may communicate with two network devices simultaneously, one of the two network devices being a primary network device of the terminal device and the other being a secondary network device of the terminal device. Wherein, the cell group provided by the main network device can be called MCG, and the cell group provided by the auxiliary network device can be called SCG. With regard to some transmission channels between the terminal device, the primary network device, the secondary network device and the core network device, reference may be made to fig. 1. It can be seen that an MCG air interface channel is provided between the terminal device and the main network device, an SCG air interface channel is provided between the terminal device and the auxiliary network device, a data forwarding channel is provided between the main network device and the auxiliary network device, a Master Node (MN) terminated Data Radio Bearer (DRB) channel is provided between the main network device and the core network device, and a Secondary Node (SN) terminated DRB channel is provided between the auxiliary network device and the core network device.

Under the double connection state, there are four data transmission channels, which are: terminal device-main network device-core network device; terminal equipment-secondary network equipment-core network equipment; terminal equipment-main network equipment-auxiliary network equipment-core network equipment; terminal device-secondary network device-primary network device-core network device. It can be seen that, among the four data transmission channels, three data transmission channels need to pass through the secondary network device, and one data transmission channel does not need to pass through the secondary network device.

For a terminal device in a dual connectivity state and in an RRC connection state, when the terminal device has no uplink traffic and no downlink traffic, the network device may configure the terminal device to enter a suspend state, for example, the main network device may configure the terminal device to enter the suspend state. When the terminal equipment is in the suspended state, the terminal equipment cannot communicate with the MCG and cannot communicate with the SCG. But still able to detect system messages or paging messages, etc. from the MCG.

When the terminal equipment has uplink service, the communication with the MCG can be recovered. In addition, it is also discussed at present that if the terminal device has uplink traffic, in addition to recovering the communication between the terminal device and the MCG, the communication between the terminal device and the SCG may also be recovered. If the communication between the terminal device and the SCG is to be resumed, this may be done, for example, by means of blind resumption, or also based on an evaluation of the measurement results of the SCG. Described separately below.

1. Blind recovery mode.

Referring to fig. 2, a flow chart of a process for blindly recovering SCGs.

S21, the main network device sends a message to the terminal device, and the terminal device receives the message from the main network device. The message is used to configure the terminal device to enter a suspend state.

For example, when the terminal device has no uplink traffic or no downlink traffic, the main network device may configure the terminal device to enter a suspend state, so as to save power consumption of the terminal device.

S22, the terminal device sends an RRC recovery request (RRC resume request) message to the main network device, and the main network device receives the RRC recovery request message from the terminal device. The RRC resume request message is for requesting to resume communication of the terminal device with the MCG and requesting to resume communication of the terminal device with the SCG.

For example, when the terminal device has uplink traffic, the terminal device initiates a procedure of recovering the SCG to the main network device. Of course, the terminal device also needs to initiate a procedure of recovering the MCG to the main network device, and details about the MCG recovery process are not repeated here.

S23, the main network device sends an RRC recovery (RRC resume) message to the terminal device, and the terminal device receives the RRC recovery message from the main network device.

The RRC resume message may instruct the terminal device to resume communication with the MCG or may instruct the terminal device to resume communication with the SCG.

S24, the terminal device sends an RRC recovery complete (RRC resume complete) message to the main network device, and the main network device receives the RRC recovery complete message from the terminal device.

After resuming communication with the MCG and with the SCG, the terminal device may send an RRC resume complete message to the main network device to inform the main network device that the terminal device has resumed communication with the MCG and with the SCG.

It can be seen that in the blind recovery mode, as long as the terminal device has an uplink service, the terminal device initiates a process of recovering the SCG.

2. The manner of recovery is based on the evaluation of the measurement of SCG.

Reference may be made to fig. 3, which is a flow chart of a process of recovering SCG based on an evaluation of the measurement results of SCG.

S31, the main network device sends a message to the terminal device, and the terminal device receives the message from the main network device. The message is used to configure the terminal device to enter a suspend state.

Regarding S31, reference may be made to the description of S21 in the flow shown in fig. 2.

And S32, the terminal equipment determines whether to recover the communication with the SCG according to the measurement result of the SCG.

For example, the terminal device may still receive a reference signal from the SCG in the suspended state, the reference signal being, for example, a Synchronization Signal Block (SSB) or a channel state information-reference signal (CSI-RS). The terminal device measures the received reference signal, and can obtain a measurement result, such as Reference Signal Receiving Power (RSRP), Reference Signal Receiving Quality (RSRQ), or the like.

The terminal device can determine whether to resume communication with the SCG based on the measurement result. For example, if the measurement result is greater than a threshold, the terminal device may determine to resume communication with the SCG; alternatively, if the measurement result is less than or equal to the threshold, the terminal device may determine not to resume communication with the SCG.

S33, the terminal device sends an RRC recovery request message to the main network device, and the main network device receives the RRC recovery request message from the terminal device.

The RRC restoration request message is for requesting restoration of communication with the MCG by the terminal device if the terminal device determines not to restore communication with the SCG in S32; alternatively, if the terminal device determines to resume communication with the SCG in S32, the RRC resume request message is for requesting to resume communication of the terminal device with the MCG and requesting to resume communication of the terminal device with the SCG.

For example, when the terminal device has uplink traffic, the terminal device initiates a procedure of recovering the MCG to the main network device, or initiates a procedure of recovering the MCG and the SCG.

S34, the main network device sends an RRC recovery message to the terminal device, and the terminal device receives the RRC recovery message from the main network device.

If the RRC recovery request message in S33 is used to request recovery of communication between the terminal device and the MCG, the RRC recovery message may instruct the terminal device to recover communication with the MCG; alternatively, if the RRC recovery request message in S33 is used to request recovery of communication between the terminal device and the MCG and SCG, the RRC recovery message may indicate to the terminal device that the terminal device should be recovered

S35, the terminal device sends an RRC recovery complete message to the main network device, and the main network device receives the RRC recovery complete message from the terminal device. Communication with the MCG and with the SCG is resumed.

After the terminal device recovers the communication with the MCG, the terminal device may send an RRC recovery complete message to the main network device to notify the main network device that the terminal device has recovered the communication with the MCG; alternatively, the terminal device may send an RRC recovery complete message to the main network device after resuming communication with the MCG and SCG to inform the main network device that the terminal device has resumed communication with the MCG and SCG.

As described above, two ways of resuming the communication between the terminal device and the SCG are introduced, and in either way, a certain amount of transmission resources need to be consumed. And if the recovery mode is performed according to the evaluation of the measurement result of the SCG, the terminal equipment needs to measure the SCG, and the terminal equipment is more expensive.

However, the recovery of SCG is not necessary, for example in some cases the terminal device may only need to communicate with the MCG and not the SCG. If this is the case, it is an unnecessary procedure for the terminal device to resume communication with the SCG, and the transmission overhead due to resuming communication with the SCG is an ineffective overhead, wasting transmission resources.

In view of this, the technical solutions of the embodiments of the present application are provided. In the embodiment of the present application, when it is determined that the uplink service is transmitted through the SCG, the communication between the terminal device and the SCG is resumed, and if the uplink service is not transmitted through the SCG, the communication between the terminal device and the SCG may not need to be resumed. In this way, the transmission overhead due to restoring the communication between the terminal device and the SCG can be reduced, and the restoration of the communication between the terminal device and the SCG can also be made more efficient.

The technical solution provided in the embodiment of the present application may be applied to a fourth generation mobile communication technology (4G) system, such as an LTE system, or may be applied to a 5G system, such as an NR system, or may also be applied to a next generation mobile communication system or other similar communication systems, as long as there is an entity that can perform a service with another entity, and the specific implementation is not limited. In addition, in the introduction process of the embodiment of the present application, an air interface communication process between a network device and a terminal device is taken as an example, and actually, the technical solution provided in the embodiment of the present application may also be applied to a Sidelink (SL), as long as one terminal device can perform a service with another terminal device. For example, the technical solution provided in the embodiment of the present application may be applied to a device-to-device (D2D) scenario, may be an NR D2D scenario, may also be an LTE D2D scenario, or may be applied to a vehicle-to-all (V2X) scenario, may be an NR V2X scenario, may also be an LTE V2X scenario, or the like, for example, may be applied to a vehicle networking, such as V2X, LTE-V, vehicle-to-vehicle (V2V), or may be applied to the fields of smart driving, smart internet connectivity, and the like.

Fig. 4 is a view of an application scenario according to an embodiment of the present application. In fig. 4, a network device 1 and a network device 2 are included, and both the network device 1 and the network device 2 serve a terminal device by wireless transmission. The terminal device establishes a connection with both the network device 1 and the network device 2, for example, the network device 1 is a main network device of the terminal device, and the network device 2 is a secondary network device of the terminal device.

The network device 1 and the network device 2 in fig. 4 are, for example, base stations. The base station corresponds to different devices in different systems, for example, the base station in 4G may correspond to a base station in 4G, for example, eNB in 4G system, and the base station in 5G may correspond to a base station in 5G, for example, gNB in 5G system. Of course, the technical solutions provided in the embodiments of the present application may also be applied to a future mobile communication system, and therefore, the network device 1 and the network device 2 in fig. 4 may also correspond to an access network device in the future mobile communication system. Fig. 4 illustrates that the network device 1 and the network device 2 are base stations, and actually, with reference to the foregoing description, the network device 1 or the network device 2 may also be RSU or the like. In addition, the terminal device in fig. 4 is taken as a mobile phone as an example, and it is actually known from the foregoing description of the terminal device, and the terminal device in the embodiment of the present application is not limited to a mobile phone.

The method provided by the embodiment of the application is described below with reference to the accompanying drawings.

An embodiment of the present application provides a method for recovering transmission, please refer to fig. 5, which is a flowchart of the method. In the following description, the method is applied to the network architecture shown in fig. 4 as an example.

For ease of description, in the following, the method is performed by a network device and a terminal device as an example. Since the present embodiment is applied to the network architecture shown in fig. 4 as an example, the primary network device described below may be the network device 1 in the network architecture shown in fig. 4, that is, the primary network device of the terminal device, the secondary network device described below may be the network device 2 in the network architecture shown in fig. 4, that is, the secondary network device of the terminal device, and the terminal device described below may be the terminal device in the network architecture shown in fig. 4.

And S51, the terminal equipment determines the uplink service.

Wherein the terminal device is in dual connection mode, i.e. the terminal device is connected with the primary network device and with the secondary network device. And the communication of the terminal device with the MCG is suspended and the communication with the SCG is also suspended, or the terminal device is in a suspended state. For example, if the terminal device has no uplink traffic and no downlink traffic before S51, S52 may be further performed, and the primary network device may send a configuration message to the terminal device, where the configuration message may indicate that the terminal device enters a suspend state. The terminal device may enter the suspend state after receiving the configuration message from the primary network device.

In the suspended state, the terminal device may detect a paging message or a system message from the MCG, but cannot perform downlink traffic with the MCG and cannot perform uplink traffic with the MCG. In addition, in the suspended state, the terminal device cannot perform downlink traffic with the SCG, and cannot perform uplink traffic with the SCG.

The terminal equipment can determine the uplink service in the suspended state. For example, when the terminal device needs to initiate an uplink service, the uplink service may be determined accordingly. The number of the uplink services determined here is one or more, and the uplink services may include uplink services to be initiated by the terminal device, or may also include all uplink services configured by the network device (e.g., the main network device) for the terminal device. For example, when the terminal device enters the RRC connected state under the primary network device, the primary network device may configure one or more uplink services for the terminal device. For example, if the terminal device initiates an uplink service by itself, the NAS layer of the terminal device may identify the uplink service to be initiated by the terminal device, and the uplink service determined by the terminal device may include the uplink service to be initiated by the terminal device; or, if the terminal device receives the paging message, the NAS layer of the terminal device may not be able to identify the uplink traffic that needs to be recovered specifically, in this case, the uplink traffic determined by the terminal device may include all uplink traffic configured by the network device (e.g., the main network device) for the terminal device.

And S53, the terminal equipment determines whether the uplink service is transmitted through the SCG.

After determining the uplink service, the terminal device may determine whether the uplink service needs to be transmitted through the SCG. The terminal device determines whether the uplink service is transmitted through the SCG, and one implementation manner is to determine whether a DRB for transmitting the uplink service belongs to the SCG. If the DRB for transmitting the uplink service belongs to the SCG, the terminal device determines that the uplink service is transmitted through the SCG, and if the DRB for transmitting the uplink service does not belong to the SCG, for example, belongs to the MCG, the terminal device determines that the uplink service is not transmitted through the SCG.

The DRB for transmitting the uplink service is, for example, a DRB corresponding to an identifier of a Protocol Data Unit (PDU) session corresponding to the uplink service. For example, in S52, the terminal device determines the uplink traffic, where the NAS layer of the terminal device may determine the uplink traffic. After determining the uplink service, the NAS layer of the terminal device may determine an identifier of a PDU session corresponding to the uplink service. The identification of the PDU session is, for example, an identity number (ID) of the PDU session, or may be other information for indicating the PDU session. The NAS layer of the terminal device may send the determined identity of the PDU session to the RRC layer of the terminal device. If the uplink services determined by the NAS layer of the terminal device are all services of the signaling plane, the NAS layer of the terminal device may not determine the identifier of the PDU session corresponding to the uplink services, or that is, the identifier of the PDU session corresponding to the uplink services determined by the NAS layer of the terminal device is empty.

After receiving the identifier of the PDU session corresponding to the uplink service, the RRC layer of the terminal device may determine the DRB corresponding to the PDU session corresponding to the identifier of the PDU session. Wherein, a DRB corresponding to a PDU session means that the PDU session is transmitted through the DRB. After determining DRBs corresponding to the PDU sessions corresponding to the identities of the PDU sessions, the RRC layer of the terminal device may determine whether there is a DRB belonging to the SCG in the DRBs. Wherein, a DRB belongs to the SCG, which means that the DRB uses a Logical Channel (LCH) of the SCG.

If a DRB belongs to the SCG, or if a DRB uses the LCH of the SCG, it indicates that the PDU session transmitted by the DRB needs to be transmitted through the SCG. In this case, the service corresponding to the PDU session also needs to be transmitted through the SCG. And if a DRB does not belong to the SCG, or if a DRB does not use the LCH of the SCG, for example, the LCH of the MCG, it indicates that the PDU session transmitted by the DRB does not need to be transmitted through the SCG. In this case, the service corresponding to the PDU session does not need to be transmitted through the SCG.

One uplink service may correspond to one PDU session or multiple PDU sessions, each PDU session corresponds to a corresponding DRB, and then one uplink service may correspond to one or multiple DRBs, where the one or multiple DRBs may all belong to an MCG, or all belong to an SCG, or there may be a part of DRBs belonging to an MCG and another part of DRBs belonging to an SCG. For an uplink service, as long as one of the corresponding DRBs belongs to the SCG, it indicates that the uplink service needs to be transmitted through the SCG. Then, for the uplink service determined by the terminal device, as long as a DRB corresponding to the uplink service in the uplink services belongs to the SCG, it indicates that the uplink service determined by the terminal device needs to be transmitted through the SCG. And if the DRBs corresponding to all the uplink services determined by the terminal device do not belong to the SCG, it indicates that the uplink services determined by the terminal device do not need to be transmitted through the SCG.

If the RRC layer of the terminal equipment determines that the uplink service determined by the terminal equipment needs to be transmitted through the SCG, the RRC layer of the terminal equipment can determine that the communication between the terminal equipment and the SCG needs to be recovered; or, if the RRC layer of the terminal device determines that the uplink service determined by the terminal device does not need to be transmitted through the SCG, the RRC layer of the terminal device may determine that the communication between the terminal device and the SCG does not need to be resumed.

S54, when the uplink service is transmitted through the SCG, the terminal device sends an RRC recovery request message to the main network device, and the main network device receives the RRC recovery request message from the terminal device. The RRC resume request message is for requesting to resume communication of the terminal device with the SCG.

If the terminal device determines that communication between the terminal device and the SCG is to be resumed, the terminal device may send an RRC resume request message to the primary network device requesting resumption of communication with the SCG. In addition, the RRC restoration request message may also request restoration of communication between the terminal device and the MCG. It can be understood that, if the terminal device determines that the uplink traffic is transmitted through the SCG, the RRC recovery request message sent by the terminal device may be used to request to recover the communication between the terminal device and the MCG and to request to recover the communication between the terminal device and the SCG (S54 in fig. 5 is taken as an example); alternatively, if the terminal device determines that the uplink traffic is not transmitted through the SCG, the terminal device may send an RRC recovery request message to the main network device, where the RRC recovery request message is used to request recovery of communication between the terminal device and the MCG, but not used to request recovery of communication between the terminal device and the SCG.

S55, the main network device sends an RRC recovery message to the terminal device, and the terminal device receives the RRC recovery message from the main network device.

If the RRC recovery request message sent by the terminal device is used to request to recover the communication between the terminal device and the MCG and request to recover the communication between the terminal device and the SCG, the RRC recovery message may be used to recover the communication between the terminal device and the MCG and recover the communication between the terminal device and the SCG (S55 in fig. 5 is taken as an example); alternatively, if the RRC recovery request message sent by the terminal device is for requesting recovery of communication between the terminal device and the MCG, but not for requesting recovery of communication between the terminal device and the SCG, the RRC recovery message may be for recovering communication between the terminal device and the MCG, but not for recovering communication between the terminal device and the SCG.

If the RRC recovery message is used to recover the communication between the terminal device and the MCG, the RRC recovery message may carry configuration information of the connection between the terminal device and the MCG, for example, referred to as first configuration information, and the terminal device may recover the communication between the terminal device and the MCG according to the first configuration information. Or, the RRC recovery message may not carry the first configuration information, the terminal device is in communication with the MCG, and the terminal device may recover the communication with the MCG according to the original configuration of the connection with the MCG.

If the RRC recovery message is used to recover the communication between the terminal device and the SCG, the RRC recovery message may carry configuration information of the connection between the terminal device and the SCG, for example, referred to as second configuration information, and the terminal device may recover the communication between the terminal device and the SCG according to the second configuration information. Or, the RRC recovery message may not need to carry the second configuration information, the terminal device is in communication with the SCG, and the terminal device may recover the communication with the SCG according to the original configuration of the connection with the SCG.

Wherein, if the RRC recovery message is used to recover the communication between the terminal device and the SCG, the primary network device may further interact with the secondary network device before sending the RRC recovery message to the terminal device, since it is the communication between the terminal device and the SCG that is to be recovered. For example, the primary network device may forward an RRC recovery request message from the terminal device to the secondary network device, and after receiving the RRC recovery request message, the secondary network device may send a confirmation message to the primary network device to confirm recovery of communication between the SCG and the terminal device, where for example, the confirmation message may carry second configuration information of connection between the terminal device and the SCG, or may not carry the second configuration information. After receiving the confirmation message, the main network device may send the RRC recovery message to the terminal device. Wherein, if the confirmation message carries the second configuration information, the primary network device may carry the second configuration information in the RRC recovery message. Through the interaction between the main network device and the auxiliary network device, the auxiliary network device can make sure that the terminal device is about to recover the communication between the terminal device and the SCG, and the auxiliary network device can also perform corresponding configuration on the connection between the terminal device and the SCG.

Alternatively, even if the RRC recovery message is used to recover communication between the terminal device and the SCG, the primary network device may not have to interact with the secondary network device, e.g., the primary network device may send the RRC recovery message to the terminal device on its own. The primary network device may still inform the secondary network device that the terminal device is to resume communication with the SCG. In this way, the secondary network device only needs to know that the terminal device is to recover the communication with the SCG, and does not need to configure the connection with the terminal device, which is helpful for reducing the burden of the secondary network device.

S56, the terminal device sends an RRC recovery complete message to the main network device, and the main network device receives the RRC recovery complete message from the terminal device.

If the RRC recovery message is used to recover the communication between the terminal device and the MCG but not used to recover the communication between the terminal device and the SCG, the terminal device may send an RRC recovery complete message to the main network device after recovering the communication with the MCG to inform the main network device that the communication between the terminal device and the MCG has been recovered; alternatively, if the RRC recovery message is used to recover the communication between the terminal device and the MCG and to recover the communication between the terminal device and the SCG, the terminal device may send an RRC recovery complete message to the main network device after recovering the communication with the MCG and the communication with the SCG to inform the main network device that the terminal device has recovered the communication with the MCG and the communication with the SCG.

In this embodiment, the terminal device may determine whether to resume communication between the terminal device and the SCG according to the uplink service. For example, when it is determined that the uplink service is transmitted through the SCG, the terminal device resumes the communication between the terminal device and the SCG, and if the uplink service is not transmitted through the SCG, the communication between the terminal device and the SCG may not need to be resumed. By the method, unnecessary SCG recovery processes can be reduced, transmission overhead caused by recovering communication between the terminal equipment and the SCG is reduced, and the recovery of the communication between the terminal equipment and the SCG is more effective.

The following describes an apparatus for implementing the above method in the embodiment of the present application with reference to the drawings. Therefore, the above contents can be used in the subsequent embodiments, and the repeated contents are not repeated.

Fig. 6 is a schematic block diagram of a communication device 600 according to an embodiment of the present application. Exemplarily, the communication apparatus 600 is, for example, a terminal device 600.

The terminal device 600 includes a processing module 610 and a transceiver module 620. Illustratively, the terminal device 600 may be a network device, or may be a chip applied in the terminal device or other combined devices, components, etc. having the functions of the terminal device. When the terminal device 600 is a terminal device, the transceiver module 620 may be a transceiver, the transceiver may include an antenna, a radio frequency circuit, and the like, and the processing module 610 may be a processor, such as a baseband processor, in which one or more Central Processing Units (CPUs) may be included. When the terminal device 600 is a component having the functions of the terminal device, the transceiver module 620 may be a radio frequency unit, and the processing module 610 may be a processor, such as a baseband processor. When the terminal device 600 is a chip system, the transceiver module 620 may be an input/output interface of a chip (e.g., a baseband chip), and the processing module 610 may be a processor of the chip system and may include one or more central processing units. It should be understood that the processing module 610 in the embodiments of the present application may be implemented by a processor or a processor-related circuit component, and the transceiver module 620 may be implemented by a transceiver or a transceiver-related circuit component.

For example, processing module 610 may be used to perform all operations performed by the terminal device in the embodiment shown in fig. 5 except transceiving operations, e.g., S51 and S53, and/or other processes for supporting the techniques described herein. The transceiver module 620 may be used to perform all receiving operations performed by the terminal device in the embodiment shown in fig. 5, e.g., S52, S54-S56, and/or other processes for supporting the techniques described herein.

In addition, the transceiver module 620 may be a functional module, which can perform both the transmitting operation and the receiving operation, for example, the transceiver module 620 may be configured to perform all the transmitting operation and the receiving operation performed by the terminal device in the embodiment shown in fig. 5, for example, when the transmitting operation is performed, the transceiver module 620 may be considered as a transmitting module, and when the receiving operation is performed, the transceiver module 620 may be considered as a receiving module; alternatively, the transceiver module 620 may also be two functional modules, and the transceiver module 620 may be regarded as a general term for the two functional modules, where the two functional modules are a transmitting module and a receiving module respectively, where the transmitting module is configured to complete a transmitting operation, for example, the transmitting module may be configured to perform all transmitting operations performed by the terminal device in any embodiment shown in fig. 5, and the receiving module is configured to complete a receiving operation, for example, the receiving module may be configured to perform all receiving operations performed by the terminal device in the embodiment shown in fig. 5.

The processing module 610 is configured to determine an uplink service, where communication between the terminal device and the master cell group MCG and communication between the terminal device and the secondary cell group SCG are suspended;

the processing module 610 is further configured to determine whether the uplink service is transmitted through an SCG;

a transceiver module 620, configured to send an RRC recovery request message to a master network device of the terminal device when the uplink service is transmitted through the SCG, where the RRC recovery request message is used to request to recover communication with the SCG.

As an optional implementation manner, the processing module 610 is configured to determine whether the uplink service is transmitted through the SCG by:

As an optional implementation manner, the data radio bearer corresponding to the identifier of the PDU session corresponding to the uplink service is a data radio bearer used for transmitting the uplink service.

As an optional implementation manner, the uplink service includes an uplink service to be initiated, or includes all uplink services configured by the main network device for the terminal device.

As an optional implementation manner, the RRC restoration request message is further used for requesting to restore communication with the MCG.

As an optional implementation, the transceiving module 620 is further configured to receive an RRC recovery message from the primary network device, where the RRC recovery message is used to recover communication with the SCG.

Fig. 7 is a schematic block diagram of a communication device 700 according to an embodiment of the present application. Illustratively, the communication device 700 is, for example, a network device 700.

Network device 700 includes a processing module 710 and a transceiver module 720. Illustratively, the network device 700 may be the master network device, or may be a chip applied in the master network device or other combined devices, components, etc. having the functions of the master network device. When the network device 700 is a primary network device, the transceiver module 720 may be a transceiver, which may include an antenna, radio frequency circuits, etc., and the processing module 710 may be a processor, which may include one or more CPUs. When the network device 700 is a component having the functions of the main network device, the transceiver module 720 may be a radio frequency unit, and the processing module 710 may be a processor, such as a baseband processor. When the network device 700 is a chip system, the transceiver module 720 may be an input/output interface of a chip (e.g., a baseband chip), and the processing module 710 may be a processor of the chip system and may include one or more central processing units. It should be understood that the processing module 710 in the embodiments of the present application may be implemented by a processor or a processor-related circuit component, and the transceiver module 720 may be implemented by a transceiver or a transceiver-related circuit component.

For example, the processing module 710 may be used to perform all operations performed by the primary network device in the embodiment shown in fig. 5 except transceiving operations, such as operations to determine that a terminal device is resuming communication with an SCG, and/or other processes to support the techniques described herein. Transceiver module 720 may be used to perform all receiving operations performed by the master network device in the embodiment shown in FIG. 5, e.g., S52, 54-S56, and/or other processes for supporting the techniques described herein.

In addition, the transceiver module 720 may be a functional module that can perform both the transmitting operation and the receiving operation, for example, the transceiver module 720 may be used to perform all the transmitting operation and the receiving operation performed by the main network device in the embodiment shown in fig. 5, for example, when the transmitting operation is performed, the transceiver module 720 may be considered as a transmitting module, and when the receiving operation is performed, the transceiver module 720 may be considered as a receiving module; alternatively, the transceiver module 720 may also be two functional modules, and the transceiver module 720 may be regarded as a general term for the two functional modules, where the two functional modules are a transmitting module and a receiving module respectively, the transmitting module is used to complete the transmitting operation, for example, the transmitting module may be used to perform all the transmitting operations performed by the main network device in the embodiment shown in fig. 5, and the receiving module is used to complete the receiving operation, for example, the receiving module may be used to perform all the receiving operations performed by the main network device in the embodiment shown in fig. 5.

The receiving and sending module 720 is configured to receive an RRC recovery request message from a terminal device, where the recovery request message is used to request recovery of communication between the terminal device and a secondary cell group SCG, where an uplink service of the terminal device is transmitted through the SCG;

the transceiver module 720 is further configured to send an RRC recovery message to the terminal device, where the RRC recovery message is used to recover the communication between the terminal device and the SCG.

As an optional implementation manner, the processing module 710 is configured to determine that the recovery request message is used to request to recover the communication between the terminal device and the secondary cell group SCG.

As an optional implementation manner, the transceiver module 720 is further configured to send an RRC recovery message to the terminal device, where the RRC recovery message is used to recover communication with the SCG.

The embodiment of the application also provides a communication device, and the communication device can be terminal equipment or a circuit. The communication device may be configured to perform the actions performed by the terminal device in the above-described method embodiments.

When the communication device is a terminal device, fig. 8 shows a simplified structural diagram of the terminal device. For easy understanding and illustration, in fig. 8, the terminal device is exemplified by a mobile phone. As shown in fig. 8, the terminal device includes a processor, a memory, a radio frequency circuit, an antenna, and an input-output device. The processor is mainly used for processing communication protocols and communication data, controlling the terminal equipment, executing software programs, processing data of the software programs and the like. The memory is used primarily for storing software programs and data. The radio frequency circuit is mainly used for converting baseband signals and radio frequency signals and processing the radio frequency signals. The antenna is mainly used for receiving and transmitting radio frequency signals in the form of electromagnetic waves. Input and output devices, such as touch screens, display screens, keyboards, etc., are used primarily for receiving data input by a user and for outputting data to the user. It should be noted that some kinds of terminal devices may not have input/output devices.

When data needs to be sent, the processor performs baseband processing on the data to be sent and outputs baseband signals to the radio frequency circuit, and the radio frequency circuit performs radio frequency processing on the baseband signals and sends the radio frequency signals to the outside in the form of electromagnetic waves through the antenna. When data is sent to the terminal equipment, the radio frequency circuit receives radio frequency signals through the antenna, converts the radio frequency signals into baseband signals and outputs the baseband signals to the processor, and the processor converts the baseband signals into the data and processes the data. For ease of illustration, only one memory and processor are shown in FIG. 8. In an actual end device product, there may be one or more processors and one or more memories. The memory may also be referred to as a storage medium or a storage device, etc. The memory may be provided independently of the processor, or may be integrated with the processor, which is not limited in this embodiment.

In the embodiment of the present application, an antenna and a radio frequency circuit having a transceiving function may be regarded as a transceiving unit of a terminal device (the transceiving unit may be a functional unit, and the functional unit is capable of implementing a transmitting function and a receiving function, or the transceiving unit may also include two functional units, which are respectively a receiving unit capable of implementing a receiving function and a transmitting unit capable of implementing a transmitting function), and a processor having a processing function may be regarded as a processing unit of the terminal device. As shown in fig. 8, the terminal device includes a transceiving unit 810 and a processing unit 820. A transceiver unit may also be referred to as a transceiver, a transceiving device, etc. A processing unit may also be referred to as a processor, a processing board, a processing module, a processing device, or the like. Optionally, a device used for implementing the receiving function in the transceiver 810 may be regarded as a receiving unit, and a device used for implementing the transmitting function in the transceiver 810 may be regarded as a transmitting unit, that is, the transceiver 810 includes a receiving unit and a transmitting unit. A transceiver unit may also sometimes be referred to as a transceiver, transceiving circuitry, or the like. A receiving unit may also be referred to as a receiver, a receiving circuit, or the like. A transmitting unit may also sometimes be referred to as a transmitter, or a transmitting circuit, etc.

It should be understood that the transceiver 810 is configured to perform the transmitting operation and the receiving operation on the terminal device side in the above method embodiments, and the processing unit 820 is configured to perform other operations besides the transceiving operation on the terminal device in the above method embodiments.

For example, in one implementation, processing unit 820 may be used to perform all operations performed by the terminal device in the embodiment shown in fig. 5, except for transceiving operations, e.g., S51 and S53, and/or other processes for supporting the techniques described herein. The transceiving unit 810 may be configured to perform all receiving operations performed by the terminal device in the embodiment illustrated in fig. 5, e.g., S52, S54-S56, and/or other processes for supporting the techniques described herein.

When the communication device is a chip-like device or circuit, the device may comprise a transceiver unit and a processing unit. The transceiver unit may be an input/output circuit and/or a communication interface; the processing unit is an integrated processor or microprocessor or integrated circuit.

When the communication device in this embodiment is a terminal device, reference may be made to the device shown in fig. 9. As an example, the device may perform functions similar to processing module 610 of FIG. 6. In fig. 9, the apparatus includes a processor 910, a transmit data processor 920, and a receive data processor 930. The processing module 610 in the above embodiments may be the processor 910 in fig. 9, and performs corresponding functions; the transceiver module 620 in the above embodiments may be the sending data processor 920 and/or the receiving data processor 930 in fig. 9, and performs corresponding functions. Although fig. 9 shows a channel encoder and a channel decoder, it is understood that these blocks are not limitative and only illustrative to the present embodiment.

Fig. 10 shows another form of the present embodiment. The processing device 1000 includes modules such as a modulation subsystem, a central processing subsystem, and peripheral subsystems. The communication device in this embodiment may serve as a modulation subsystem therein. Specifically, the modulation subsystem may include a processor 1003 and an interface 1004. The processor 1003 performs the functions of the processing module 610, and the interface 1004 performs the functions of the transceiver module 620. As another variation, the modulation subsystem includes a memory 1006, a processor 1003 and a program stored on the memory 1006 and executable on the processor, and the processor 1003 implements the method on the terminal device side in the above method embodiment when executing the program. It should be noted that the memory 1006 may be non-volatile or volatile, and may be located inside the modulation subsystem or in the processing device 1000, as long as the memory 1006 can be connected to the processor 1003.

When the device in the embodiment of the present application is a network device, the device may be as shown in fig. 11. The apparatus 1100 includes one or more radio frequency units, such as a Remote Radio Unit (RRU) 1110 and one or more baseband units (BBUs) (which may also be referred to as digital units, DUs) 1120. The RRU 1110 may be referred to as a transceiver module, and the transceiver module may include a transmitting module and a receiving module, or the transceiver module may be a module capable of implementing transmitting and receiving functions. The transceiver module may correspond to the transceiver module 720 in fig. 7. Alternatively, the transceiver module may also be referred to as a transceiver, a transceiver circuit, or a transceiver, etc., which may include at least one antenna 1111 and a radio frequency unit 1112. The RRU 1110 is mainly used for transceiving radio frequency signals and converting the radio frequency signals and baseband signals, for example, for sending indication information to a terminal device. The BBU 1110 is mainly used for performing baseband processing, controlling a base station, and the like. The RRU 1110 and the BBU 1120 may be physically disposed together or may be physically disposed separately, that is, distributed base stations.

The BBU 1120 is a control center of the base station, and may also be referred to as a processing module, and may correspond to the processing module 710 in fig. 7, and is mainly used for completing baseband processing functions, such as channel coding, multiplexing, modulation, spreading, and the like. For example, the BBU (processing module) may be configured to control the base station to perform an operation procedure related to the network device in the foregoing method embodiment, for example, to generate the foregoing indication information.

In an example, the BBU 1120 may be formed by one or more boards, and the boards may support a radio access network of a single access system (e.g., an LTE network) together, or may support radio access networks of different access systems (e.g., an LTE network, a 5G network, or other networks) respectively. The BBU 1120 also includes a memory 1121 and a processor 1122. The memory 1121 is used for storing necessary instructions and data. The processor 1122 is configured to control the base station to perform necessary actions, for example, to control the base station to perform the operation procedure related to the network device in the above method embodiment. The memory 1121 and processor 1122 may serve one or more boards. That is, the memory and processor may be provided separately on each board. Multiple boards may share the same memory and processor. In addition, each single board can be provided with necessary circuits.

The embodiment of the application provides a communication system. The communication system may comprise a terminal device according to the embodiment shown in fig. 5 and described above, and a master network device according to the embodiment shown in fig. 5. Optionally, a secondary network device according to the embodiment shown in fig. 5 may also be included. The terminal device is, for example, terminal device 600 in fig. 6. The master network device is, for example, network device 700 in fig. 7.

An embodiment of the present application further provides a computer-readable storage medium, where a computer program is stored, and when the computer program is executed by a computer, the computer may implement the process related to the main network device in the embodiment shown in fig. 5 and provided by the foregoing method embodiment.

An embodiment of the present application further provides a computer-readable storage medium, where the computer-readable storage medium is used to store a computer program, and when the computer program is executed by a computer, the computer may implement the process related to the terminal device in the embodiment shown in fig. 5 provided in the foregoing method embodiment.

An embodiment of the present application further provides a computer program product, where the computer program is used to store a computer program, and when the computer program is executed by a computer, the computer may implement the process related to the main network device in the embodiment shown in fig. 5 and provided by the foregoing method embodiment.

An embodiment of the present application further provides a computer program product, where the computer program is used to store a computer program, and when the computer program is executed by a computer, the computer may implement the process related to the terminal device in the embodiment shown in fig. 5 and provided by the foregoing method embodiment.

It should be understood that the processor mentioned in the embodiments of the present application may be a CPU, and may also be other general purpose processors, Digital Signal Processors (DSPs), Application Specific Integrated Circuits (ASICs), Field Programmable Gate Arrays (FPGAs) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, and the like. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.

It will also be appreciated that the memory referred to in the embodiments of the application may be either volatile memory or nonvolatile memory, or may include both volatile and nonvolatile memory. The non-volatile memory may be a read-only memory (ROM), a Programmable ROM (PROM), an Erasable PROM (EPROM), an electrically Erasable EPROM (EEPROM), or a flash memory. Volatile memory can be Random Access Memory (RAM), which acts as external cache memory. By way of example, but not limitation, many forms of RAM are available, such as Static Random Access Memory (SRAM), Dynamic Random Access Memory (DRAM), Synchronous Dynamic Random Access Memory (SDRAM), double data rate SDRAM, enhanced SDRAM, SLDRAM, Synchronous Link DRAM (SLDRAM), and direct rambus RAM (DR RAM).

It should be noted that when the processor is a general-purpose processor, a DSP, an ASIC, an FPGA or other programmable logic device, a discrete gate or transistor logic device, or a discrete hardware component, the memory (memory module) is integrated in the processor.

It should be noted that the memory described herein is intended to comprise, without being limited to, these and any other suitable types of memory.

It should be understood that, in the various embodiments of the present application, the sequence numbers of the above-mentioned processes do not mean the execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation to the implementation process of the embodiments of the present application.

Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.

It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.

In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.

The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.

In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit.

The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present application or portions thereof that substantially contribute to the prior art may be embodied in the form of a software product stored in a storage medium and including instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present application. The computer readable storage medium can be any available medium that can be accessed by a computer. Taking this as an example but not limiting: a computer-readable medium may include a Random Access Memory (RAM), a read-only memory (ROM), an electrically erasable programmable read-only memory (EEPROM), a compact disk read-only memory (CD-ROM), a universal serial bus flash disk (universal serial bus flash disk), a removable hard disk, or other optical disk storage, magnetic disk storage or other magnetic storage devices, or any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer.

The above description is only for the specific implementation of the present application, but the scope of the embodiments of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the embodiments of the present application, and all the changes or substitutions should be covered by the scope of the embodiments of the present application. Therefore, the protection scope of the embodiments of the present application shall be subject to the protection scope of the claims.

Claims

A method for resuming transmission, comprising:

determining an uplink service, wherein the communication between the terminal equipment and the master cell group MCG and the communication between the terminal equipment and the auxiliary cell group SCG are suspended;

determining whether the uplink service is transmitted through an SCG;

and when the uplink service is transmitted through the SCG, sending a Radio Resource Control (RRC) recovery request message to the main network equipment of the terminal equipment, wherein the RRC recovery request message is used for requesting to recover the communication with the SCG.
The method of claim 1, wherein determining whether the uplink traffic is transmitted through the SCG comprises:

and determining whether a data radio bearer for transmitting the uplink service belongs to the SCG, wherein when the data radio bearer belongs to the SCG, the uplink service is transmitted through the SCG, otherwise, the uplink service is not transmitted through the SCG.
The method of claim 2, wherein the data radio bearer corresponding to the identifier of the PDU session corresponding to the uplink service is a data radio bearer for transmitting the uplink service.
The method according to any one of claims 1 to 3, wherein the uplink traffic includes uplink traffic to be initiated, or includes all uplink traffic configured for the terminal device by the main network device.
The method of any of claims 1 to 4, wherein the RRC resume request message is further configured to request resumption of communication with the MCG.
The method according to any one of claims 1 to 5, further comprising:

receiving an RRC recovery message from the primary network device, the RRC recovery message to resume communication with the SCG.
A method for resuming transmission, comprising:

receiving an RRC recovery request message from a terminal device, wherein the recovery request message is used for requesting to recover the communication between the terminal device and an SCG (cell group gateway), and an uplink service of the terminal device is transmitted through the SCG;

and sending an RRC recovery message to the terminal equipment, wherein the RRC recovery message is used for recovering the communication between the terminal equipment and the SCG.
The method of claim 7, wherein the RRC resume request message is further configured to request resumption of communication with the MCG.
The method according to claim 7 or 8, characterized in that the method further comprises:

and sending an RRC recovery message to the terminal equipment, wherein the RRC recovery message is used for recovering the communication with the SCG.
A communications apparatus, comprising:

the processing module is used for determining uplink service, wherein the communication between the terminal equipment and the MCG and the communication between the terminal equipment and the SCG are suspended;

the processing module is further configured to determine whether the uplink service is transmitted through an SCG;

a transceiver module, configured to send an RRC recovery request message to a master network device of the communication apparatus when the processing module determines that the uplink service is transmitted through the SCG, where the RRC recovery request message is used to request to recover communication with the SCG.
The communications apparatus of claim 10, wherein determining whether the uplink traffic is transmitted through the SCG comprises:

and determining whether a data radio bearer for transmitting the uplink service belongs to the SCG, wherein when the data radio bearer belongs to the SCG, the uplink service is transmitted through the SCG, otherwise, the uplink service is not transmitted through the SCG.
The communications apparatus as claimed in claim 11, wherein the data radio bearer corresponding to the identifier of the PDU session corresponding to the uplink service is a data radio bearer for transmitting the uplink service.
A communication apparatus according to any one of claims 10 to 12, wherein the uplink traffic includes uplink traffic to be initiated, or includes all uplink traffic configured for the communication apparatus by the main network device.
The communication device according to any of claims 10 to 13, wherein the RRC resume request message is further configured to request to resume communication with the MCG.
A communications apparatus according to any one of claims 10-14, wherein the transceiver module is further configured to receive an RRC recovery message from the primary network device, the RRC recovery message configured to resume communications with the SCG.
A network device, comprising:

a transceiver module for receiving an RRC recovery request message from a communication device;

a processing module, configured to determine that the recovery request message is used to request to recover communication between the terminal device and an SCG, where an uplink service of the communication apparatus is transmitted through the SCG;

the transceiver module is further configured to send an RRC recovery message to the communication device, where the RRC reply message is used to recover the communication between the communication device and the SCG.
The network device of claim 16, wherein the RRC resume request message is further configured to request resumption of communication with the MCG.
The network device according to claim 16 or 17, wherein the transceiver module is further configured to send an RRC recovery message to the communication apparatus, and wherein the RRC recovery message is configured to resume communication with the SCG.
A communication system comprising a communication apparatus according to any of claims 10 to 15 and a network device according to any of claims 16 to 18.
A computer-readable storage medium, for storing a computer program which, when run on a computer, causes the computer to perform the method of any one of claims 1 to 6, or causes the computer to perform the method of any one of claims 7 to 9.
A chip comprising a processor and a communication interface, the processor being configured to read instructions to perform the method of any of claims 1 to 6 or to perform the method of any of claims 7 to 9.