CN109756942B

CN109756942B - Switching method, terminal and network equipment

Info

Publication number: CN109756942B
Application number: CN201910165158.7A
Authority: CN
Inventors: 周帅; 吴佳兴; 吴大鹏; 崔亚平
Original assignee: Vivo Mobile Communication Co Ltd
Current assignee: Vivo Mobile Communication Co Ltd
Priority date: 2019-03-05
Filing date: 2019-03-05
Publication date: 2021-06-22
Anticipated expiration: 2039-03-05
Also published as: CN109756942A

Abstract

The invention provides a switching method, a terminal and network equipment, which solve the problems that a user can continuously execute cell switching operation under the background of high-speed movement of a vehicle, great signaling overhead can be caused according to the existing cell switching scheme, and the service requirement of low time delay of the Internet of vehicles is difficult to meet. The switching method of the embodiment of the invention comprises the following steps: and in the case of triggering the handover of the distributed unit DU, the source DU is handed over to the target DU. In the embodiment of the invention, under the condition of triggering DU switching, the terminal can be directly switched with the DU without a core network, thereby reducing signaling overhead and switching time delay and meeting the service requirement of low time delay of the Internet of vehicles.

Description

Switching method, terminal and network equipment

Technical Field

The present invention relates to the field of communications technologies, and in particular, to a handover method, a terminal, and a network device.

Background

Mobility management in current cellular networks relies on a network control mechanism assisted by a User Equipment (UE) under which the UE periodically measures the Reference Signal Receiving Power (RSRP) or Reference Signal Receiving Quality (RSRQ) of neighboring cells according to the network configuration. After filtering and processing the measurement information, if a handover trigger condition of a certain cell is satisfied, the UE sends information on the measurement to the core network through a measurement report. The core network then commands the UE to perform mobility events through dedicated (RRC) signaling.

When cell switching is performed each time, a large amount of signaling flows through a core network and an access network, however, under the background of high-speed movement of a vehicle, a user can continuously perform cell switching operation, according to the cell switching scheme, great signaling overhead is caused, and the service requirement of low time delay of the internet of vehicles is difficult to meet.

Disclosure of Invention

The invention aims to provide a switching method, a terminal and network equipment, which are used for solving the problems that a user can continuously execute cell switching operation under the background of high-speed movement of a vehicle, great signaling overhead can be caused according to the conventional cell switching scheme, and the service requirement of low time delay of the Internet of vehicles is difficult to meet.

In a first aspect, an embodiment of the present invention provides a handover method, applied to a terminal, including:

and in the case of triggering the handover of the distributed unit DU, the source DU is handed over to the target DU.

In a second aspect, an embodiment of the present invention provides a handover method, applied to a target distributed unit DU, including:

and in case of triggering DU handover, establishing connection with the terminal.

In a third aspect, an embodiment of the present invention provides a handover method, applied to a source distributed unit DU, including:

when the DU handover is triggered, the connection with the terminal is released according to a release instruction transmitted by a CU connected to the target DU.

In a third aspect, an embodiment of the present invention provides a terminal, including:

and the switching module is used for switching the source DU to the target DU under the condition of triggering the switching of the distributed unit DU.

In a fifth aspect, an embodiment of the present invention provides a terminal, including: memory, processor and computer program stored on the memory and executable on the processor, which when executed by the processor implements the steps of the handover method as applied to the terminal.

In a sixth aspect, an embodiment of the present invention provides a network device, where the network device is a target distributed unit DU, and the network device includes:

and the connection module is used for establishing connection with the terminal under the condition of triggering DU switching.

In a seventh aspect, an embodiment of the present invention provides a network device, where the network device is a source distributed unit DU, and the network device includes:

and the release module is used for releasing the connection with the terminal according to a release instruction sent by a CU connected with the target DU under the condition of triggering DU switching.

In an eighth aspect, an embodiment of the present invention provides a network device, including: memory, processor and computer program stored on the memory and executable on the processor, which when executed by the processor implements the steps of the handover method as described above applied to the target DU side or the source DU side.

In a ninth aspect, an embodiment of the present invention further provides a computer-readable storage medium, where a computer program is stored on the computer-readable storage medium, and when executed by a processor, the computer program implements the steps applied to the handover method on the terminal side, the target DU side, or the source DU side as described above.

Thus, in the handover method of the embodiment of the present invention, under the condition of triggering DU handover, the terminal is directly handed over from the source DU to the target DU, that is, under the condition of triggering DU handover, the terminal can directly handover with the DU without passing through a core network, thereby reducing signaling overhead and handover delay, and meeting the service requirement of low delay in the internet of vehicles.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments of the present invention will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without inventive labor.

Fig. 1 is a flowchart illustrating a handover method according to an embodiment of the present invention;

FIG. 2 is an interaction diagram of a handover method according to an embodiment of the present invention;

FIG. 3 is a second exemplary interaction diagram of a handover method according to an embodiment of the present invention;

FIG. 4 is a diagram illustrating the configuration of DU groups through windows in an embodiment of the present invention;

FIG. 5 is a schematic view of a window as a function of vehicle movement in an embodiment of the present invention;

fig. 6 is a diagram illustrating DU handover in an embodiment of the present invention;

FIG. 7 is a second flowchart illustrating a handover method according to an embodiment of the present invention;

FIG. 8 is a third flowchart illustrating a handover method according to a third embodiment of the present invention;

fig. 9 is a schematic structural diagram of a module of the terminal according to the embodiment of the present invention;

fig. 10 is a block diagram of a terminal in the embodiment of the present invention;

FIG. 11 is a block diagram of a network device according to an embodiment of the present invention;

fig. 12 is a second block diagram of a network device according to another embodiment of the invention;

fig. 13 is a block diagram of a network device according to an embodiment of the present invention.

Detailed Description

Exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the invention are shown in the drawings, it should be understood that the invention can be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.

The terms first, second and the like in the description and in the claims of the present application are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus. In the description and in the claims "and/or" means at least one of the connected objects.

The following description provides examples and does not limit the scope, applicability, or configuration set forth in the claims. Changes may be made in the function and arrangement of elements discussed without departing from the spirit and scope of the disclosure. Various examples may omit, substitute, or add various procedures or components as appropriate. For example, the described methods may be performed in an order different than described, and various steps may be added, omitted, or combined. In addition, features described with reference to certain examples may be combined in other examples.

As shown in fig. 1, an embodiment of the present invention provides a switching method, which is applied to a terminal, where the terminal may specifically be a vehicle-mounted terminal, and the switching method includes:

step 101: and in the case of triggering the handover of the distributed unit DU, the source DU is handed over to the target DU.

In the embodiment of the present invention, the condition for triggering DU handover includes at least one of the following:

the Reference Signal Received Quality (RSRQ) of the target DU is greater than the RSRQ threshold value;

the sum of the reference signal received power RSRP of the source DU and the first offset is smaller than the RSRP of the target DU;

the sum of the RSRP of the unit CU in the source set corresponding to the source DU and the second offset is smaller than the RSRP of the unit CU in the target set corresponding to the target DU.

Here, after the terminal performs channel quality measurement, when the DU handover is triggered, the terminal autonomously establishes a connection with the target DU and releases the connection with the source DU.

According to the switching method provided by the embodiment of the invention, under the condition of triggering DU switching, the terminal is directly switched from the source DU to the target DU, namely under the condition of triggering DU switching, the terminal can be directly switched with the DU without passing through a core network, so that the signaling overhead and the switching time delay are reduced, and the service requirement of low time delay of the Internet of vehicles can be met.

As a first optional implementation manner, in the case of triggering a handover of a distributed unit DU, the handover from a source DU to a target DU includes:

under the condition of triggering DU switching, if a target DU and a source DU belong to different centralized units CU, sending first information to the target distributed unit DU, wherein the first information comprises the configuration information of the terminal;

receiving second information, wherein the second information includes configuration information of the target DU, and the second information is sent by the target DU according to the first information;

and switching the source DU to the target DU according to the configuration information of the target DU.

The first information and the second information may specifically be interaction information between the terminal and the base station in a random access process. For example, the first information may be random access request information and the second information may be random access response information.

The configuration information of the target DU may include an ID of the target DU, and the configuration information of the terminal may include an ID of the terminal.

When a DU is switched due to switching of CUs, for example, when the sum of RSRP of a unit CU in a source set corresponding to a source DU and a second offset is smaller than RSRP of a unit CU in a target set corresponding to a target DU, a terminal performs information interaction with the target DU, the terminal acquires configuration information of the target DU, the target DU acquires configuration information of the terminal, and after the two acquire configuration information of each other, the terminal can directly switch from the source DU to the target DU according to the configuration information of the target DU.

Further, in this implementation manner, the switching from the source DU to the target DU according to the configuration information of the target DU includes:

receiving a DU access instruction sent by a target DU;

according to the DU access indication and the configuration information of the target DU, establishing connection with the target DU and releasing the connection with the source DU;

and sending DU access indication confirmation to the target DU.

The following describes the switching procedure of the DUs in this implementation with reference to fig. 2, where DU1 is a source DU, DU2 is a target DU, and CU is a CU connected to DU 2.

As shown in fig. 2, the handover procedure includes:

step 201: and under the condition of triggering DU switching, the terminal performs information interaction with the target DU to acquire the configuration information of the target DU.

Specifically, the terminal and the target DU perform information interaction through a random access process to obtain configuration information of the target DU, such as an ID of the target DU.

Step 202: the target DU sends a DU access indication to the terminal.

Step 203: and the terminal accesses the target DU according to the DU access instruction and then sends an access instruction confirmation to the target DU.

Step 204: the CU to which the target DU is connected sends a release indication to the source DU.

Step 205: the source DU releases the connection with the terminal and sends release completion information to the CU connected with the target DU.

According to the switching method provided by the embodiment of the invention, the terminal can be directly switched with the DU, and the CU can perform signaling interaction with the source DU and the target DU after switching, so that the switching time delay is greatly reduced.

Further, in the case of triggering the handover of the distributed unit DU, before the handover from the source DU to the target DU, the method further includes:

the method comprises the steps of obtaining configuration information of each DU in a DU group used for terminal autonomous handover, wherein the DU group comprises at least two DUs, and the target DU and the source DU both belong to the DU group.

In the embodiment of the present invention, before the terminal performs autonomous handover, the core network may configure configuration information of each DU in the DU group for the terminal to perform autonomous handover, where the configuration information may include an ID of the DU. Specifically, before the terminal performs autonomous handover, the core network may perform context configuration on the terminal and the DUs, and the terminal is notified of which DUs can perform autonomous handover.

Fig. 3 is a signaling configuration procedure of a DU group for terminal autonomous handover. As shown in fig. 3, the signaling configuration procedure includes:

step 301: the CU sends a DU set preparation indication to the plurality of DUs.

Step 302: upon receiving the DU preparation instruction, the DU preparation acknowledgement is sent to the CU.

Here, after the DU confirmation that the DU group preparation instruction has been received confirms that the autonomous handover service can be performed, the DU group preparation confirmation is transmitted to the CU.

Step 303: the CU sends configuration information of each DU in the DU group to the terminal.

Step 304: and the terminal sends DU group configuration completion information to the CU.

Here, before the terminal performs autonomous handover, the CU interacts with the DU group, confirms that the DU group can perform autonomous handover service and stores IDs of DUs in the autonomous handover DU group, and then the CU configures and transmits a DU list that the UE can perform autonomous handover to the terminal.

Based on this, as a second optional implementation manner, in the case of triggering the handover of the distributed unit DU, the handover from the source DU to the target DU includes:

and under the condition of triggering DU switching, if the target DU and the source DU belong to the same centralized unit CU, switching from the source DU to the target DU according to the configuration information of the target DU in the DU group.

Specifically, according to the configuration information of the target DU, a connection is established with the target DU, and the connection with the source DU is released.

Here, after the terminal performs the channel quality test, if the triggering condition for triggering DU handover is satisfied, and the target DU and the source DU belong to the same CU, and the target DU and the source DU are both DUs in the DU group, the terminal autonomously switches from the source DU to the target DU according to the configuration information of the target DU in the DU group, that is, autonomously establishes a connection with the target DU and releases the connection with the source DU according to the configuration information of the target DU in the DU group, and this switching process does not need to pass through a core network, thereby reducing signaling overhead and switching delay, and thus being capable of satisfying the service requirement of low delay in the car networking.

Further, in the embodiment of the present invention, the switching of the DU is not completely autonomous, and whether the terminal has the authority of autonomous switching, the triggering condition for triggering the switching of the DU, and the like may be specified by the core network.

Based on this, the aforementioned switching from the source DU to the target DU according to the configuration information of the target DU in the DU group includes:

and under the condition that the terminal has the autonomous switching authority, switching the source DU to the target DU according to the configuration information of the target DU in the DU group.

Here, if the terminal is configured to be capable of performing autonomous handover, after the terminal performs a channel quality test, if a trigger condition for triggering DU handover is satisfied, the source DU is handed over to the target DU according to configuration information of the target DU in the DU group.

Preferably, the distance between each DU in the DU group and the current location of the terminal is smaller than a distance threshold.

In the embodiment of the present invention, when a terminal enters a CU, the CU may prepare a DU group for the terminal to autonomously switch, but since the CU cannot know when the terminal leaves the CU, many prepared DUs become invalid, thereby causing a waste of resources. To solve the problem, an embodiment of the present invention provides a method for dynamically configuring a DU, that is, a DU group is dynamically configured according to a location of a terminal. For example, the dynamic configuration is located on both sides of the terminal, and the preset number of DUs whose distance from the current location of the terminal is smaller than the distance threshold are DU groups.

As shown in fig. 4, a window may be configured, and the window may include a preset number of DUs, for example, the window includes 7 DUs, and the window moves along with the movement of the terminal, as shown in fig. 5, the DUs included in the window changes along with the movement of the vehicle, that is, a preset number of DUs that are closer to the current location of the terminal are selected as the DU group.

In the embodiment of the invention, several DUs which are closer to the terminal are dynamically configured as the DUs for the autonomous switching according to the movement of the terminal, thereby achieving the purpose of saving the DU resources.

The following describes the handover procedure of the embodiment of the present invention with reference to fig. 6.

During the driving process of the vehicle network terminal (such as a vehicle), switching needs to be performed among different distributed units so as to ensure reliable connection with an access network. The conditions for handover triggering are of the following types: (1) join or leave distributed units: and the vehicle network terminal measures the channel quality and joins or quits the distributed base station according to the comparison between the RSRQ and the threshold value. (2) Switching among different DUs: the RSRP of the target DU and the serving DU plus offset (offset between the target candidate cell and the currently camped cell) may be used for comparison. Since the RSRQ is greater than the threshold in the DU coverage, the received powers may be compared. The application scenario includes DU switching under the same centralized unit and DU switching caused by CU switching.

As shown in fig. 6, when the in-vehicle terminal detects that RSRQ of DU1 is greater than the threshold (DU 1)_RSRQ> th), DU1 is added. When the vehicle-mounted terminal measures the channel quality, the DU2 is detected_RSRP＞DU1_RSRPAt + offset, DU switching under the same CU coverage is performed, and DU1 is switched to DU 2. When CU2_RSRP＞CU1_RSRP+ offset, CU switching is performed from CU1 to CU 2. When the vehicle-mounted terminal measures the channel quality, the RSRQ of DU4 is detected to be larger than the threshold value (DU 4)_RSRQ> th), then DU4 is added, followed by detection that the RSRQ of DU4 is less than or equal to the threshold (DU 4)_RSRQTh) to release DU 4.

Wherein, DU1_RSRPRSRP for DU1, DU1_RSRQRSRQ for DU1, CU1_RSRPRSRP for CU1, CU2_RSRPRSRP for CU2, th for threshold, DU4_RSRQRepresenting DU4_RSRQ，DU2_RSRPIndicating the RSRP of DU 2.

As shown in fig. 7, an embodiment of the present invention further provides a handover method, applied to a target DU, including:

step 701: and in case of triggering DU handover, establishing connection with the terminal.

Here, under the condition of triggering DU switching, the target DU and the terminal autonomously establish connection without passing through a core network, thereby reducing signaling overhead and switching delay, and meeting the service requirement of low delay in the internet of vehicles.

Further, in the case of triggering DU handover, establishing a connection with the terminal includes:

under the condition that DU handover is triggered and a target DU and a source DU belong to different centralized units CU, receiving first information sent by a terminal, wherein the first information comprises configuration information of the terminal;

sending second information according to the first information, wherein the second information comprises the configuration information of the target DU;

and establishing connection with the terminal according to the configuration information of the terminal.

When the DU is switched due to the switching of the CU, for example, when the sum of the RSRP of the unit CU in the source set corresponding to the source DU and the second offset is smaller than the RSRP of the unit CU in the target set corresponding to the target DU, the terminal and the target DU perform information interaction, the terminal acquires the configuration information of the target DU, the target DU acquires the configuration information of the terminal, and after the two acquire the configuration information of each other, the terminal can directly switch from the source DU to the target DU according to the configuration information of the target DU.

Further, establishing a connection with the terminal according to the configuration information of the terminal includes:

according to the configuration information of the terminal, sending a DU access instruction to the terminal;

and obtaining DU access indication confirmation, wherein the DU access indication confirmation is sent by the terminal after the terminal accesses the target DU according to the DU access indication.

Here, the interaction flow between the target DU and the terminal has been described in detail in the above embodiment of the terminal-side method, and is not described here again.

Further, before establishing a connection with the terminal under the condition of triggering the DU handover, the method further includes:

receiving a DU group preparation instruction sent by a CU connected with the target DU;

and determining the DU as one DU in the DU group used for terminal autonomous handover according to the DU group preparation instruction, and sending DU group preparation confirmation to the CU connected with the target DU.

The DU group preparation indication is used to confirm whether the DU is available for autonomous handover, and if the DU sends the DU group preparation confirmation, the DU indicates that the DU is available for autonomous handover.

The signaling configuration flow has been described in detail in the above embodiment of the terminal side method, and is not described herein again.

Further, the distance between each DU in the DU group and the current location of the terminal is smaller than a distance threshold.

and acquiring the configuration information of the pre-configured terminal.

Specifically, information such as the ID of the terminal may be acquired through the core network.

Here, before the terminal performs autonomous handover, the core network may perform context configuration on the terminal and the DUs, and the terminal is notified of which DUs can perform autonomous handover.

According to the switching method provided by the embodiment of the invention, under the condition of triggering DU switching, the target DU and the terminal are automatically connected without passing through a core network, so that the signaling overhead and the switching time delay are reduced, and the service requirement of low time delay of the Internet of vehicles can be met.

As shown in fig. 8, an embodiment of the present invention further provides a handover method, applied to a source distributed unit DU, including:

step 801: when the DU handover is triggered, the connection with the terminal is released according to a release instruction transmitted by a CU connected to the target DU.

The conditions for triggering the DU handover include at least one of:

Further, after releasing the connection with the terminal, the method further includes:

and sending release completion information to the CU connected with the target DU.

Specifically, under the condition of triggering DU handover, receiving a release instruction sent by a CU connected to a target DU; releasing the connection with the terminal according to the release instruction; and sending release completion information to the CU connected with the target DU.

In the embodiment of the invention, under the condition of triggering DU switching, the connection with the terminal is released according to the release instruction sent by the CU connected with the target DU, so that the switching from the source DU to the target DU of the terminal is realized, a core network is not needed, the signaling overhead and the switching time delay are reduced, and the service requirement of the Internet of vehicles with low time delay can be met.

Fig. 9 is a schematic block diagram of a terminal according to an embodiment of the present invention, and as shown in fig. 9, an embodiment of the present invention further provides a terminal 900, including:

a handover module 901, configured to handover a source DU to a target DU when a handover of a distributed unit DU is triggered.

In the terminal of the embodiment of the present invention, the switching module 901 includes:

a first sending sub-module, configured to send, when DU handover is triggered, first information to a target distributed unit DU if the target DU and a source DU belong to different centralized units CU, where the first information includes configuration information of the terminal;

a first receiving sub-module, configured to receive second information, where the second information includes configuration information of the target DU, and the second information is sent by the target DU according to the first information;

and the switching submodule is used for switching the source DU to the target DU according to the configuration information of the target DU.

In the terminal of the embodiment of the present invention, the switching submodule includes:

a first receiving unit, configured to receive a DU access instruction sent by a target DU;

a processing unit, configured to establish a connection with the target DU according to the DU access instruction and the configuration information of the target DU, and release the connection with the source DU;

a first sending unit, configured to send a DU access indication acknowledgement to the target DU.

The terminal of the embodiment of the invention further comprises:

a first obtaining module, configured to, when the handover module triggers a distributed unit DU handover, obtain configuration information of each DU in a DU group for terminal autonomous handover before a source DU is handed over to a target DU, where the DU group includes at least two DUs, and the target DU and the source DU both belong to the DU group.

In the terminal according to the embodiment of the present invention, the switching module is configured to, when a DU is triggered to be switched, switch from a source DU to a target DU according to configuration information of the target DU in the DU group if the target DU and the source DU belong to the same CU as the central unit.

In the terminal according to the embodiment of the present invention, the switching module is configured to switch the source DU to the target DU according to the configuration information of the target DU in the DU group when the terminal has the autonomous switching right.

In the terminal of the embodiment of the present invention, the distance between each DU in the DU group and the current position of the terminal is smaller than the distance threshold.

In the terminal of the embodiment of the present invention, the condition for triggering DU handover includes at least one of the following:

According to the terminal provided by the embodiment of the invention, under the condition of triggering DU switching, the terminal is directly switched from the source DU to the target DU, namely under the condition of triggering DU switching, the terminal can be directly switched with the DU without passing through a core network, so that the signaling overhead and the switching time delay are reduced, and the service requirement of low time delay of the Internet of vehicles can be met.

To better achieve the above object, further, fig. 10 is a schematic diagram of a hardware structure of a terminal implementing various embodiments of the present invention, where the terminal 100 includes, but is not limited to: radio frequency unit 101, network module 102, audio output unit 103, input unit 104, sensor 105, display unit 106, user input unit 107, interface unit 108, memory 109, processor 1010, and power source 1011. Those skilled in the art will appreciate that the terminal configuration shown in fig. 10 is not intended to be limiting, and that the terminal may include more or fewer components than shown, or some components may be combined, or a different arrangement of components. In the embodiment of the present invention, the terminal includes, but is not limited to, a vehicle-mounted terminal.

The radio frequency unit 101 is configured to receive and transmit data under the control of the processor 1010;

a processor 1010, configured to switch from the source DU to the target DU if the handover of the distributed unit DU is triggered.

It should be understood that, in the embodiment of the present invention, the radio frequency unit 101 may be used for receiving and sending signals during a message transmission or call process, and specifically, receives downlink data from a base station and then processes the received downlink data to the processor 1010; in addition, the uplink data is transmitted to the base station. Typically, radio frequency unit 101 includes, but is not limited to, an antenna, at least one amplifier, a transceiver, a coupler, a low noise amplifier, a duplexer, and the like. In addition, the radio frequency unit 101 can also communicate with a network and other devices through a wireless communication system.

The terminal provides wireless broadband internet access to the user through the network module 102, such as helping the user send and receive e-mails, browse web pages, access streaming media, and the like.

The audio output unit 103 may convert audio data received by the radio frequency unit 101 or the network module 102 or stored in the memory 109 into an audio signal and output as sound. Also, the audio output unit 103 may also provide audio output related to a specific function performed by the terminal 100 (e.g., a call signal reception sound, a message reception sound, etc.). The audio output unit 103 includes a speaker, a buzzer, a receiver, and the like.

The input unit 104 is used to receive an audio or video signal. The input Unit 104 may include a Graphics Processing Unit (GPU) 1041 and a microphone 1042, and the Graphics processor 1041 processes image data of a still picture or video obtained by an image capturing device (e.g., a camera) in a video capturing mode or an image capturing mode. The processed image frames may be displayed on the display unit 106. The image frames processed by the graphic processor 1041 may be stored in the memory 109 (or other storage medium) or transmitted via the radio frequency unit 101 or the network module 102. The microphone 1042 may receive sound and may be capable of processing such sound into audio data. The processed audio data may be converted into a format output transmittable to a mobile communication base station via the radio frequency unit 101 in case of a phone call mode.

The terminal 100 also includes at least one sensor 105, such as a light sensor, motion sensor, and other sensors. Specifically, the light sensor includes an ambient light sensor that can adjust the brightness of the display panel 1061 according to the brightness of ambient light, and a proximity sensor that can turn off the display panel 1061 and/or a backlight when the terminal 100 is moved to the ear. As one of the motion sensors, the accelerometer sensor can detect the magnitude of acceleration in each direction (generally three axes), detect the magnitude and direction of gravity when stationary, and can be used to identify the terminal posture (such as horizontal and vertical screen switching, related games, magnetometer posture calibration), vibration identification related functions (such as pedometer, tapping), and the like; the sensors 105 may also include fingerprint sensors, pressure sensors, iris sensors, molecular sensors, gyroscopes, barometers, hygrometers, thermometers, infrared sensors, etc., which are not described in detail herein.

The display unit 106 is used to display information input by a user or information provided to the user. The Display unit 106 may include a Display panel 1061, and the Display panel 1061 may be configured in the form of a Liquid Crystal Display (LCD), an Organic Light-Emitting Diode (OLED), or the like.

The user input unit 107 may be used to receive input numeric or character information and generate key signal inputs related to user settings and function control of the terminal. Specifically, the user input unit 107 includes a touch panel 1071 and other input devices 1072. Touch panel 1071, also referred to as a touch screen, may collect touch operations by a user on or near the touch panel 1071 (e.g., operations by a user on or near touch panel 1071 using a finger, stylus, or any suitable object or attachment). The touch panel 1071 may include two parts of a touch detection device and a touch controller. The touch detection device detects the touch direction of a user, detects a signal brought by touch operation and transmits the signal to the touch controller; the touch controller receives touch information from the touch sensing device, converts the touch information into touch point coordinates, sends the touch point coordinates to the processor 1010, and receives and executes commands sent by the processor 1010. In addition, the touch panel 1071 may be implemented in various types, such as a resistive type, a capacitive type, an infrared ray, and a surface acoustic wave. In addition to the touch panel 1071, the user input unit 107 may include other input devices 1072. Specifically, other input devices 1072 may include, but are not limited to, a physical keyboard, function keys (e.g., volume control keys, switch keys, etc.), a trackball, a mouse, and a joystick, which are not described in detail herein.

Further, the touch panel 1071 may be overlaid on the display panel 1061, and when the touch panel 1071 detects a touch operation thereon or nearby, the touch panel 1071 transmits the touch operation to the processor 1010 to determine the type of the touch event, and then the processor 1010 provides a corresponding visual output on the display panel 1061 according to the type of the touch event. Although in fig. 10, the touch panel 1071 and the display panel 1061 are two independent components to implement the input and output functions of the terminal, in some embodiments, the touch panel 1071 and the display panel 1061 may be integrated to implement the input and output functions of the terminal, and is not limited herein.

The interface unit 108 is an interface for connecting an external device to the terminal 100. For example, the external device may include a wired or wireless headset port, an external power supply (or battery charger) port, a wired or wireless data port, a memory card port, a port for connecting a device having an identification module, an audio input/output (I/O) port, a video I/O port, an earphone port, and the like. The interface unit 108 may be used to receive input (e.g., data information, power, etc.) from an external device and transmit the received input to one or more elements within the terminal 100 or may be used to transmit data between the terminal 100 and the external device.

The memory 109 may be used to store software programs as well as various data. The memory 109 may mainly include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required by at least one function (such as a sound playing function, an image playing function, etc.), and the like; the storage data area may store data (such as audio data, a phonebook, etc.) created according to the use of the cellular phone, and the like. Further, the memory 109 may include high speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other volatile solid state storage device.

The processor 1010 is a control center of the terminal, connects various parts of the entire terminal using various interfaces and lines, and performs various functions of the terminal and processes data by operating or executing software programs and/or modules stored in the memory 109 and calling data stored in the memory 109, thereby performing overall monitoring of the terminal. Processor 1010 may include one or more processing units; preferably, the processor 1010 may integrate an application processor, which mainly handles operating systems, user interfaces, application programs, etc., and a modem processor, which mainly handles wireless communications. It will be appreciated that the modem processor described above may not be integrated into processor 1010.

The terminal 100 may also include a power source 1011 (e.g., a battery) for powering the various components, and preferably, the power source 1011 may be logically coupled to the processor 1010 via a power management system that may be configured to manage charging, discharging, and power consumption.

In addition, the terminal 100 includes some functional modules that are not shown, and thus, the detailed description thereof is omitted.

Preferably, an embodiment of the present invention further provides a terminal, including a processor 1010, a memory 109, and a computer program stored in the memory 109 and capable of running on the processor 1010, where the computer program is executed by the processor 1010 to implement the processes of the information transmission method embodiment, and can achieve the same technical effects, and in order to avoid repetition, details are not described here again. A terminal may be a wireless terminal or a wired terminal, and a wireless terminal may be a device providing voice and/or other service data connectivity to a user, a handheld device having a wireless connection function, or other processing devices connected to a wireless modem. Wireless terminals, which may be mobile terminals such as mobile telephones (or "cellular" telephones) and computers having mobile terminals, such as portable, pocket, hand-held, computer-included, or vehicle-mounted mobile devices, may communicate with one or more core networks via a Radio Access Network (RAN), which may exchange language and/or data with the RAN. Examples of such devices include Personal Communication Service (PCS) phones, cordless phones, Session Initiation Protocol (SIP) phones, Wireless Local Loop (WLL) stations, and Personal Digital Assistants (PDAs). A wireless Terminal may also be referred to as a system, a Subscriber Unit (Subscriber Unit), a Subscriber Station (Subscriber Station), a Mobile Station (Mobile), a Remote Station (Remote Station), a Remote Terminal (Remote Terminal), an Access Terminal (Access Terminal), a User Terminal (User Terminal), a User Agent (User Agent), and a User Device or User Equipment (User Equipment), which are not limited herein.

The embodiment of the present invention further provides a computer-readable storage medium, where a computer program is stored on the computer-readable storage medium, and when the computer program is executed by a processor, the computer program implements each process of the information transmission method embodiment, and can achieve the same technical effect, and in order to avoid repetition, details are not repeated here. The computer-readable storage medium may be a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk.

As shown in fig. 11, an embodiment of the present invention further provides a network device, where the network device is a target distributed unit DU, and the network device includes:

a connection module 1101, configured to establish a connection with the terminal when the DU handover is triggered.

In the network device of the embodiment of the present invention, the connection module includes:

the second receiving submodule is used for receiving first information sent by a terminal under the condition that DU handover is triggered and a target DU and a source DU belong to different centralized units CU, wherein the first information comprises configuration information of the terminal;

a second sending submodule, configured to send second information according to the first information, where the second information includes configuration information of the target DU;

and the connection submodule is used for establishing connection with the terminal according to the configuration information of the terminal.

In the network device of the embodiment of the present invention, the connection sub-module includes:

a second sending unit, configured to send a DU access instruction to the terminal according to the configuration information of the terminal;

and a second receiving unit, configured to obtain a DU access indication acknowledgement, where the DU access indication acknowledgement is sent by the terminal after accessing the target DU according to the DU access indication.

The network device of the embodiment of the invention further comprises:

a receiving module, configured to receive, by the connection module before establishing a connection with a terminal, a DU group preparation instruction sent by a CU connected to the target DU;

and the determining module is used for determining the DU as one DU in the DU group used for the terminal autonomous handover according to the DU group preparation instruction, and sending DU group preparation confirmation to the CU connected with the target DU.

In the network device according to the embodiment of the present invention, the distance between each DU in the DU group and the current location of the terminal is smaller than the distance threshold.

The network device of the embodiment of the invention further comprises:

and the second acquisition module is used for acquiring the pre-configured configuration information of the terminal before the connection module establishes connection with the terminal.

In the network device of the embodiment of the present invention, the connection module is configured to establish a connection with the terminal according to the configuration information of the terminal.

According to the network equipment provided by the embodiment of the invention, under the condition of triggering DU switching, the target DU and the terminal are automatically connected without passing through a core network, so that the signaling overhead and the switching time delay are reduced, and the service requirement of low time delay of the Internet of vehicles can be met.

An embodiment of the present invention further provides a network device, including: the memory, the processor, and the computer program stored in the memory and capable of running on the processor, when executed by the processor, implement the processes in the above method embodiment applied to the target DU side handover method, and can achieve the same technical effects, and are not described herein again to avoid repetition.

An embodiment of the present invention further provides a computer-readable storage medium, where a computer program is stored on the computer-readable storage medium, and when the computer program is executed by a processor, the computer program implements each process in the above-mentioned embodiment of the handover method applied to the target DU side, and can achieve the same technical effect, and is not described herein again to avoid repetition. The computer-readable storage medium may be a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk.

As shown in fig. 12, an embodiment of the present invention further provides a network device 1200, where the network device is a source distributed unit DU, and the network device includes:

a releasing module 1201, configured to release the connection with the terminal according to a release instruction sent by a CU connected to the target DU when the DU handover is triggered.

The network device of the embodiment of the invention further comprises:

and the sending module is used for sending release completion information to the CU connected with the target DU after the release module releases the connection with the terminal.

The network equipment in the embodiment of the invention releases the connection with the terminal according to the release instruction sent by the CU connected with the target DU under the condition of triggering DU switching so as to realize the switching of the terminal from the source DU to the target DU without passing through a core network, thereby reducing signaling overhead and switching time delay and meeting the service requirement of low time delay of the Internet of vehicles.

An embodiment of the present invention further provides a network device, including: the method comprises a memory, a processor and a computer program stored in the memory and capable of running on the processor, wherein the computer program, when executed by the processor, implements the processes in the method embodiment of the source DU side handover method, and can achieve the same technical effects, and further description is omitted here to avoid repetition.

An embodiment of the present invention further provides a computer-readable storage medium, where a computer program is stored on the computer-readable storage medium, and when the computer program is executed by a processor, the computer program implements each process in the embodiment of the handover method applied to the source DU side, and can achieve the same technical effect, and is not described herein again to avoid repetition. The computer-readable storage medium may be a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk.

As shown in fig. 13, an embodiment of the present invention further provides a network device 1300, where the network device is a DU, and the network device includes a processor 1301, a transceiver 1302, a memory 1303, and a bus interface, where:

when the network device is a target DU, the processor 1301 is configured to read the program in the memory 1303, and execute the following processes:

Optionally, the processor 1301 reads the program in the memory 1303, and is further configured to execute:

Optionally, a distance between each DU in the DU group and the current location of the terminal is smaller than a distance threshold.

and acquiring the configuration information of the pre-configured terminal.

When the network device is a source DU, the processor 1301 is configured to read the program in the memory 1303, and execute the following processes: when the DU handover is triggered, the connection with the terminal is released according to a release instruction transmitted by a CU connected to the target DU.

after the connection with the terminal is released, the method further comprises the following steps:

In fig. 13, the bus architecture may include any number of interconnected buses and bridges, with one or more processors represented by processor 1301 and various circuits of memory represented by memory 1303 linked together. The bus architecture may also link together various other circuits such as peripherals, voltage regulators, power management circuits, and the like, which are well known in the art, and therefore, will not be described any further herein. The bus interface provides an interface. The transceiver 1302 may be a plurality of elements including a transmitter and a receiver that provide a means for communicating with various other apparatus over a transmission medium.

It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.

Through the above description of the embodiments, those skilled in the art will clearly understand that the method of the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but in many cases, the former is a better implementation manner. Based on such understanding, the technical solutions of the present invention may be embodied in the form of a software product, which is stored in a storage medium (such as ROM/RAM, magnetic disk, optical disk) and includes instructions for enabling a terminal (such as a mobile phone, a computer, a server, an air conditioner, or a network device) to execute the method according to the embodiments of the present invention.

While the present invention has been described with reference to the embodiments shown in the drawings, the present invention is not limited to the embodiments, which are illustrative and not restrictive, and it will be apparent to those skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope of the invention as defined in the appended claims.

Claims

1. A switching method is applied to a terminal, and is characterized by comprising the following steps:

under the condition of triggering the switching of the distributed unit DU, switching from the source DU to the target DU;

wherein, in a case that the target DU and the source DU belong to different central units CU, and in a case that the distributed unit DU handover is triggered, the handover from the source DU to the target DU includes:

under the condition of triggering DU switching, sending first information to a target distributed unit DU, wherein the first information comprises configuration information of the terminal; receiving second information, wherein the second information includes configuration information of the target DU, and the second information is sent by the target DU according to the first information; according to the configuration information of the target DU, switching from the source DU to the target DU;

or, in a case that the target DU and the source DU belong to different central units CU, and in a case that the handover of the distributed unit DU is triggered, before the source DU is handed over to the target DU, the method further includes:

the method comprises the steps of obtaining configuration information of each DU in a DU group for terminal autonomous handover, wherein the DU group comprises at least two DUs, the target DU and the source DU all belong to the DU group, and the configuration information of each DU in the DU group for terminal autonomous handover is obtained, the DU group comprises at least two DUs, and the target DU and the source DU all belong to the DU group.

2. The handover method according to claim 1, wherein the handover from the source DU to the target DU according to the configuration information of the target DU comprises:

receiving a DU access instruction sent by a target DU;

and sending DU access indication confirmation to the target DU.

3. The handover method according to claim 1, wherein in case of triggering handover of a distributed unit DU, the handover from a source DU to a target DU comprises:

4. The handover method according to claim 3, wherein the handover from the source DU to the target DU according to the configuration information of the target DU in the DU group comprises:

5. The handover method according to claim 1, wherein each DU in the set of DUs has a distance from the current location of the terminal that is less than a distance threshold.

6. The handover method according to claim 1, wherein the condition for triggering the DU handover comprises at least one of the following:

7. A handover method is applied to a target Distributed Unit (DU), and is characterized by comprising the following steps:

under the condition of triggering DU switching, establishing connection with a terminal;

wherein, in a case that the target DU and the source DU belong to different central units CU, and in a case that DU handover is triggered, establishing a connection with the terminal includes:

under the condition of triggering DU switching, receiving first information sent by a terminal, wherein the first information comprises configuration information of the terminal; sending second information according to the first information, wherein the second information comprises the configuration information of the target DU; establishing connection with the terminal according to the configuration information of the terminal;

or, in a case that the target DU and the source DU belong to different central units CU, before establishing a connection with the terminal when the DU handover is triggered, the method further includes:

8. The handover method according to claim 7, wherein establishing a connection with the terminal according to the configuration information of the terminal comprises:

9. The handover method according to claim 7, wherein each DU in the set of DUs has a distance from the current location of the terminal that is less than a distance threshold.

10. The handover method according to claim 7, wherein before the establishing the connection with the terminal, the method further comprises:

and acquiring the configuration information of the pre-configured terminal.

11. The handover method according to claim 10, wherein the establishing a connection with a terminal comprises:

12. A terminal, comprising:

the switching module is used for switching the source DU to the target DU under the condition of triggering the switching of the distributed unit DU;

wherein, in case that the target DU and the source DU belong to different central units CU, the switching module includes:

a first sending sub-module, configured to send, when DU handover is triggered, first information to a target distributed unit DU if the target DU and a source DU belong to different centralized units CU, where the first information includes configuration information of the terminal; a first receiving sub-module, configured to receive second information, where the second information includes configuration information of the target DU, and the second information is sent by the target DU according to the first information; the switching submodule is used for switching the source DU to the target DU according to the configuration information of the target DU;

or, in a case that the target DU and the source DU belong to different centralized units CU, the terminal further includes: a first obtaining module, configured to, when the handover module triggers a distributed unit DU handover, obtain configuration information of each DU in a DU group for terminal autonomous handover before a source DU is handed over to a target DU, where the DU group includes at least two DUs, and the target DU and the source DU both belong to the DU group.

13. The terminal of claim 12, wherein the handover submodule comprises:

14. The terminal of claim 12, wherein the handover module is configured to, in case of triggering DU handover, handover from a source DU to a target DU according to configuration information of the target DU in the DU group if the target DU and the source DU belong to the same CU.

15. The terminal of claim 14, wherein the handover module is configured to handover from a source DU to a target DU according to configuration information of the target DU in the DU group if the terminal has autonomous handover right.

16. The terminal of claim 12, wherein each DU in the set of DUs is less than a distance threshold from a current location of the terminal.

17. The terminal of claim 12, wherein the condition for triggering DU handover comprises at least one of:

18. A terminal, comprising: memory, processor and computer program stored on the memory and executable on the processor, which computer program, when being executed by the processor, carries out the steps of the handover method according to any one of claims 1 to 6.

19. A network device, the network device being a target distributed unit, DU, comprising:

the connection module is used for establishing connection with the terminal under the condition of triggering DU switching;

wherein, in case that the target DU and the source DU belong to different central units CU, the connection module includes:

a second receiving submodule, configured to receive first information sent by a terminal under a condition that a DU handover is triggered, where the first information includes configuration information of the terminal; a second sending submodule, configured to send second information according to the first information, where the second information includes configuration information of the target DU; the connection submodule is used for establishing connection with the terminal according to the configuration information of the terminal;

or, in case that the target DU and the source DU belong to different central units CU, the network device further comprises: a receiving module, configured to receive, by the connection module before establishing a connection with a terminal, a DU group preparation instruction sent by a CU connected to the target DU; and the determining module is used for determining the DU as one DU in the DU group used for the terminal autonomous handover according to the DU group preparation instruction, and sending DU group preparation confirmation to the CU connected with the target DU.

20. The network device of claim 19, wherein the connection submodule comprises:

21. The network device of claim 19, wherein each DU in the set of DUs has a distance from a current location of the terminal that is less than a distance threshold.

22. The network device of claim 19, further comprising:

23. The network device of claim 22, wherein the connection module is configured to establish a connection with the terminal according to configuration information of the terminal.

24. A network device, comprising: memory, processor and computer program stored on the memory and executable on the processor, which computer program, when being executed by the processor, carries out the steps of the handover method according to any one of claims 7 to 11.

25. A computer-readable storage medium, characterized in that a computer program is stored thereon, which computer program, when being executed by a processor, carries out the steps of the handover method according to one of the claims 1 to 8 or the steps of the handover method according to one of the claims 7 to 11.