Method and device for transmitting data, storage medium, UE, and first access network equipment

Abstract

A method and apparatus for transmitting data, a storage medium, a UE, and a first access network device, the method comprising: sending a leave indication message to the first access network device; receiving a dedicated access parameter from the first access network device; and when accessing the first access network device again, using the dedicated access parameter for random access. The present invention can reduce the access parameters that need to be reconfigured and reduce the possibility of conflict by using dedicated access parameters.

Description

Technical Field

[0001] The present invention relates to the field of communication technology, and in particular to a method and device for transmitting data, a storage medium, a UE, and a first access network device. Background Art

[0002] In the prior art, the same terminal can be installed with multiple Subscriber Identity Module (SIM) cards, for example, two cards are installed for work-related contacts and private contacts respectively. To save terminal costs, the two cards usually share a set of underlying hardware, such as radio frequency hardware, baseband, etc., and the upper layer protocol stack is that each SIM card builds and uses its own protocol stack to transmit data with the network to which each card belongs. The two SIM cards can belong to the same operator or different operators.

[0003] In specific applications, since the two cards share the underlying hardware, the terminal can only transmit data with the first access network device (such as base station A) through one card at the same time, but it is necessary to regularly listen to paging at another second access network device (such as base station B) to ensure UE accessibility to the second access network device. If the terminal finds that it has received its own paging through the second access network device, it needs to establish a connection through the second access network device, and then determine the reason why the second access network device sends the paging, whether it is because of the data of which service, or other reasons, and determine whether to switch to the second access network device to transmit service data. If the UE finds that the current service priority of the second access network device is higher than the current service priority of the first access network device, the UE switches to the second access network device to transmit high-priority data first; if the UE finds that the current service priority of the second access network device is lower than the current service priority of the first access network device, it returns to the first access network device to continue transmitting service data.

[0004] However, in the prior art, the access process when the UE accesses the first access network device again after leaving the first access network device is complicated and prone to conflicts, resulting in access failure. Summary of the invention

[0005] The technical problem solved by the present invention is to provide a method and device for transmitting data, a storage medium, a UE, and a first access network device, which can reduce the access parameters that need to be reconfigured and reduce the possibility of conflicts by adopting dedicated access parameters.

[0006] To solve the above technical problems, an embodiment of the present invention provides a method for transmitting data, comprising the following steps: sending a leave indication message to a first access network device; receiving dedicated access parameters from the first access network device; and when accessing the first access network device again, using the dedicated access parameters for random access.

[0007] Optionally, sending the departure indication information to the first access network device includes: determining a departure time length for leaving the first access network device; and indicating the departure time length to the first access network device.

[0008] Optionally, determining the departure time length for leaving the first access network device satisfies at least one of the following: when the service priority of the second access network device is not determined, determining the departure time length to be a first preconfigured departure time length; when determining the service priority of the second access network device and determining that it is necessary to return to the first access network device to transmit the service, determining the departure time length to be a second preconfigured departure time length; when determining the service priority of the second access network device and determining that it is necessary to transmit the service on the second access network device, determining the departure time length to be infinite.

[0009] Optionally, sending departure indication information to the first access network device includes: determining a departure time point and / or service status of leaving the first access network device; sending the departure time point and / or service status to the first access network device, or directly requesting the first access network device to determine the departure time length so that the first access network device determines the departure time length; wherein the service status is selected from one or more of the following: not determining the service priority of the second access network device, determining the service priority of the second access network device and determining the need to return to the first access network device to transmit the service, determining the service priority of the second access network device and determining the need to transmit the service on the second access network device.

[0010] Optionally, the dedicated access parameter includes at least one of the following: a dedicated random access preamble code, a dedicated identifier C-RNTI, and a dedicated uplink transmission radio resource.

[0011] Optionally, the method for transmitting data also includes: determining whether there are data packets that have not been successfully transmitted or segments of data packets that have not been successfully transmitted when leaving the first access network device; if so, performing one or more of the following: for downlink transmission, triggering a PDCP status report; for downlink transmission, triggering an RLC status report; for uplink transmission, retransmitting uplink data packets that have not been successfully transmitted in the PDCP record; for uplink transmission, retransmitting uplink data packets or segments of uplink data packets that have not been successfully transmitted in the RLC record; triggering a regular BSR; for uplink transmission, triggering POLL.

[0012] Optionally, the method for transmitting data also includes: when counting the amount of data indicated by the above-mentioned conventional BSR, at least one of the following is satisfied: the amount of data includes the amount of data packets determined by the UE in the PDCP that need to be retransmitted; the amount of data includes the data packets determined by the UE in the RLC that need to be retransmitted; the amount of data includes segments of the data packets determined by the UE in the RLC that need to be retransmitted.

[0013] Optionally, the method for transmitting data also includes: when leaving the first access network device, determining whether there are data packets or segments of data packets that have not been successfully transmitted; if there are data packets or segments of data packets that have not been successfully transmitted, determining whether the service type of the data packets that have not been successfully transmitted belongs to a data cluster service; if it belongs to a data cluster service, abandoning the transmission of the current cluster, and not counting any data packets in the current cluster in the BSR; or, if it belongs to a data cluster service, continuing to complete the transmission of the current cluster, and counting the data packets and / or segments of data packets that have not been transmitted in the current cluster in the BSR, as well as the data packets and / or segments of data packets that need to be retransmitted in the current cluster.

[0014] Optionally, when leaving the first access network device, determine whether the current service type belongs to a data cluster service; if it belongs to a data cluster service, determine whether there are data packets or segments of data packets that have not been successfully transmitted; if there are data packets or segments of data packets that have not been successfully transmitted, abandon transmission of the current cluster, and do not count any data packets in the current cluster in the BSR.

[0015] To solve the above technical problem, an embodiment of the present invention provides a method for transmitting data, comprising the following steps: receiving a leave indication message from a UE; and sending a dedicated access parameter to the UE so that the UE uses the dedicated access parameter for random access when accessing again.

[0016] Optionally, receiving departure indication information from the UE includes: receiving departure time length from the UE.

[0017] Optionally, the departure time length satisfies at least one of the following: when the UE has not determined the service priority of the second access network device, the departure time length is a first preconfigured departure time length; when the UE determines the service priority of the second access network device and determines that it is necessary to return to the first access network device to transmit the service, the departure time length is a second preconfigured departure time length; when the UE determines the service priority of the second access network device and determines that it is necessary to transmit the service on the second access network device, the departure time length is infinite.

[0018] Optionally, receiving departure indication information from the UE includes: receiving a departure time point and / or service status from the UE, or receiving a direct request to determine the length of the departure time; determining the length of the departure time; wherein the service status is selected from one or more of the following: the UE has not determined the service priority of the second access network device, the UE has determined the service priority of the second access network device and determined that it is necessary to return to the first access network device to transmit the service, and the UE has determined the service priority of the second access network device and determined that it is necessary to transmit the service on the second access network device.

[0019] Optionally, the determining of the departure time length is selected from: interacting with the second access network device to determine the departure time length; interacting with other network elements to determine the departure time length; and determining the departure time length by itself.

[0020] Optionally, the dedicated access parameter includes at least one of the following: a dedicated random access preamble code, a dedicated identifier C-RNTI, and a dedicated uplink transmission radio resource.

[0021] Optionally, the method for transmitting data also includes: determining whether there are data packets that have not been successfully transmitted or segments of data packets that have not been successfully transmitted when the UE leaves; if so, performing one or more of the following: for uplink transmission, triggering a PDCP status report; for uplink transmission, triggering an RLC status report; for downlink transmission, retransmitting downlink data packets that have not been successfully transmitted in the PDCP record; for downlink transmission, retransmitting downlink data packets that have not been successfully transmitted in the RLC record or segments of downlink data packets.

[0022] To solve the above technical problems, an embodiment of the present invention provides a device for transmitting data, comprising: a first sending module, used to send a departure indication message to a first access network device; a first receiving module, used to receive dedicated access parameters from the first access network device; and an access module, used to perform random access using the dedicated access parameters when accessing the first access network device again.

[0023] To solve the above technical problems, an embodiment of the present invention provides a device for transmitting data, comprising: a second receiving module, used to receive departure indication information from a UE; a second sending module, used to send dedicated access parameters to the UE, so that the UE uses the dedicated access parameters for random access when accessing again.

[0024] To solve the above technical problems, an embodiment of the present invention provides a storage medium on which computer instructions are stored. When the computer instructions are executed, the steps of the above method for transmitting data are executed, or the steps of the above method for transmitting data are executed.

[0025] To solve the above technical problem, an embodiment of the present invention provides a UE, including a memory and a processor, wherein the memory stores computer instructions that can be executed on the processor, and the processor executes the steps of the above method for transmitting data when executing the computer instructions.

[0026] To solve the above technical problems, an embodiment of the present invention provides a first access network device, including a memory and a processor, wherein the memory stores computer instructions that can be run on the processor, and the processor executes the steps of the above data transmission method when running the computer instructions.

[0027] Compared with the prior art, the technical solution of the embodiment of the present invention has the following beneficial effects:

[0028] In an embodiment of the present invention, by setting the UE to send a leaving indication message to the first access network device and then receiving a dedicated access parameter from the first access network device, the dedicated access parameter can be used for random access when accessing the first access network device again. Compared with the prior art in which the access process is complicated and prone to conflicts when the UE leaves the first access network device and accesses again, the scheme of the embodiment of the present invention can reduce the access parameters that need to be reconfigured and reduce the possibility of conflicts by using dedicated access parameters.

[0029] Furthermore, setting the UE to determine and indicate the length of time for leaving the first access network device can improve the autonomy of the UE and achieve data transmission more flexibly.

[0030] Further, the UE is set to send the departure time point and / or service status to the first access network device so that the first access network device determines the departure time length. Since the first access network device can determine the departure time length after information interaction with the second access network device or other network elements, it helps to improve the accuracy of determining the departure time length.

[0031] Furthermore, by setting steps such as triggering a PDCP status report, triggering an RLC status report, retransmitting uplink data packets that have not been successfully transmitted in the PDCP record, retransmitting uplink data packets that have not been successfully transmitted in the RLC record or segments of uplink data packets, and triggering a regular BSR, it is possible to reasonably arrange the data packets that have not been successfully uploaded, thereby improving the data continuity and effectiveness after the UE leaves the first access network device.

[0032] Furthermore, by setting a step of determining whether the service type of the data packet that has not been successfully transmitted belongs to a data cluster service if there is a data packet or a segment of a data packet that has not been successfully transmitted, and if it belongs to a data cluster service, abandoning the transmission of the current cluster, and not counting the data packets that have been transmitted in the current cluster in the BSR; or continuing to complete the transmission of the current cluster, and counting the data packets that have not been transmitted in the current cluster in the BSR, it is possible to further reasonably arrange the data packets that have not been successfully uploaded, thereby improving the data continuity and effectiveness after the UE leaves the first access network device. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 is a flow chart of a first data transmission method according to an embodiment of the present invention;

[0034] Figure 2 is a flow chart of a second data transmission method according to an embodiment of the present invention;

[0035] Figure 3 is a flow chart of a third method for transmitting data in an embodiment of the present invention;

[0036] Figure 4 is a partial flow chart of a fourth method for transmitting data in an embodiment of the present invention;

[0037] Figure 5 is a flowchart of a fifth method for transmitting data in an embodiment of the present invention;

[0038] Figure 6 It is a schematic diagram of a working scenario of data cluster transmission in an embodiment of the present invention;

[0039] Figure 7 is a flow chart of a sixth method for transmitting data in an embodiment of the present invention;

[0040] Figure 8 is a structural schematic diagram of a data transmission device in an embodiment of the present invention;

[0041] Fig. 9 It is a schematic diagram of the structure of another data transmission device in an embodiment of the present invention. DETAILED DESCRIPTION

[0042] As mentioned above, in the prior art, the same terminal can be installed with multiple SIM cards, and the terminal can only transmit data with the first access network device through one card, and needs to regularly monitor paging to another second access network device to ensure UE accessibility to the second access network device. However, the access process when the UE leaves the first access network device and accesses again is complicated and prone to conflicts, resulting in access failure.

[0043] Specifically, after the UE is turned on, it establishes a connection with the mobile network. It needs to first establish a Radio Resource Control (RRC) connection with the first access network device (such as base station A), and then register with the core network, perform security authentication, etc. After successful registration, the core network assigns a temporary identity, a temporary mobile user identity (Serving-TemporaryMobile Subscriber Identity, S-TMSI) to the UE. Afterwards, if the UE has no business data to transmit, the RRC connection between the UE and the first access network device is disconnected, and the UE enters the IDLE state. It is worth noting that at this time, the access network does not save any information about the UE, but the core network saves the UE's information, such as S-TMSI.

[0044] Among them, the UE in the idle (IDLE) state can start service data transmission through two types of processes: calling and called.

[0045] -Calling: If the UE wants to initiate service data, the UE actively initiates an RRC connection with the base station, then performs a service request process with the core network, establishes a service transmission channel, and starts data transmission;

[0046] -Called: If the core network receives a data packet from the IP network, and the recipient of the data packet is the UE, the core network initiates a paging request to the access network. After receiving the paging request, the access network sends a paging through the wireless interface. After receiving the paging, the UE initiates an RRC connection with the base station, and then performs the service channel establishment process with the core network. Subsequently, the data packet is transmitted to the UE.

[0047] To save UE power consumption, UE in IDLE state does not always monitor data transmitted by the wireless network. To ensure that UE in IDLE state can receive paging, the protocol stipulates that the network and UE calculate the paging opportunity based on S-TMSI and other cell broadcast parameters. UE monitors paging messages at the calculated paging opportunity and does not need to monitor at other times. When the access network receives a paging request from the core network, it obtains the UE's S-TMSI, calculates the timing of transmitting paging on the wireless interface based on the S-TMSI, and sends paging at the calculated paging opportunity.

[0048] Furthermore, after the UE monitors the paging of the second access network device, it negotiates to leave the network with the first access network device. There are two ways to implement this step:

[0049] Idea 1: The UE is completely disconnected from the first access network device, which is equivalent to the end of the service. From the perspective of the first access network device, the UE enters the IDLE state;

[0050] Idea 2: The UE is temporarily disconnected from the first access network device, which is different from the end of the service. From the perspective of the first access network device, the UE enters a temporary state, a temporary state between the connected state and the IDLE state. The base station retains part of the UE information, such as the UE identity, service information, etc., but does not transmit data.

[0051] In the case that the UE may return to the first access network device to transmit data after determining the service priority, the first approach is adopted. If the UE returns to the first access network device to transmit data, a complete access process is required. If the second approach is adopted, if the UE returns to the first access network device to transmit data, the first access network device stores some of the UE's service-related information, which can simplify the UE's access process.

[0052] After research, the inventor of the present invention found that in the process of adopting the method of idea one, the access process is too complicated and prone to conflicts, resulting in access failure; in the process of adopting the method of idea two, since the first access network device is not sure whether the UE returns to the first access network device, it results in excessive network resources being occupied and prone to conflicts, resulting in access failure.

[0053] In an embodiment of the present invention, by setting the UE to send a leaving indication message to the first access network device and then receiving a dedicated access parameter from the first access network device, the dedicated access parameter can be used for random access when accessing the first access network device again. Compared with the prior art in which the access process is complicated and prone to conflicts when the UE leaves the first access network device and accesses again, the scheme of the embodiment of the present invention can reduce the access parameters that need to be reconfigured and reduce the possibility of conflicts by using dedicated access parameters.

[0054] In order to make the above-mentioned objects, features and beneficial effects of the present invention more obvious and easy to understand, specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0055] Reference Figure 1 , Figure 1 1 is a flowchart of a first method for transmitting data in an embodiment of the present invention. The first method for transmitting data may be used on the UE side, and the steps of the first method for transmitting data may include steps S11 to S13:

[0056] Step S11: Sending a leave indication message to the first access network device;

[0057] Step S12: receiving dedicated access parameters from the first access network device;

[0058] Step S13: when accessing the first access network device again, random access is performed using the dedicated access parameters.

[0059] Specifically, the departure indication information can be used to indicate the expected departure time information, such as the departure time length indicating the expected departure time, the departure time point indicating the expected departure moment, etc. It can also simultaneously indicate the departure time length and the expected departure moment.

[0060] The dedicated access parameter may be configured by the first access network device for the UE and is an access parameter dedicated to the UE, thereby saving the step of reallocation and reducing the possibility of conflict.

[0061] In an embodiment of the present invention, by setting the UE to send a leaving indication message to the first access network device and then receiving a dedicated access parameter from the first access network device, the dedicated access parameter can be used for random access when accessing the first access network device again. Compared with the prior art in which the access process is complicated and prone to conflicts when the UE leaves the first access network device and accesses again, the scheme of the embodiment of the present invention can reduce the access parameters that need to be reconfigured and reduce the possibility of conflicts by using dedicated access parameters.

[0062] Reference Figure 2 , Figure 2 1 is a flow chart of a second method for transmitting data in an embodiment of the present invention. The second method for transmitting data can be used on the UE side, and can also include steps S21 to S24:

[0063] Step S21: determining the length of time for leaving the first access network device;

[0064] Step S22: indicating the length of the absence time to the first access network device;

[0065] Step S23: receiving dedicated access parameters from the first access network device;

[0066] Step S24: when accessing the first access network device again, random access is performed using the dedicated access parameters.

[0067] In the specific implementation of step S21, the UE originally transmits data with the first access network device. When the UE determines to leave the first access network device, the length of time of leaving is determined.

[0068] The departure time length is used to indicate the estimated duration from when the UE leaves the first access network device to when it accesses the first access network device again.

[0069] Further, it is determined that the departure time length of leaving the first access network device satisfies at least one of the following: when the service priority of the second access network device is not determined, the departure time length is determined to be a first preconfigured departure time length; when the service priority of the second access network device is determined, and it is determined that it is necessary to return to the first access network device to transmit the service, the departure time length is determined to be the second preconfigured departure time length; when the service priority of the second access network device is determined, and it is determined that it is necessary to transmit the service on the second access network device, the departure time length is determined to be infinite.

[0070] The first preconfigured departure time length may be specified by a protocol, and the second preconfigured departure time length may be specified by a protocol, or may depend on the service priority of the second access network device.

[0071] Specifically, for the situation where the UE already knows that the purpose of leaving is to respond to the paging of the second access network device, but does not know the service priority of the second access network device, that is, the UE already knows that the purpose of leaving is to respond to the paging of the second access network device, but does not know the service priority of the second access network device, the UE can determine a pre-configured departure time length.

[0072] For the case where the UE already knows that the departure is to respond to the paging at the second access network device and knows the service priority of the second access network device, that is, the UE already knows that the departure is to respond to the paging at the second access network device and knows the service priority of the second access network device, the UE can determine the departure time length according to the service priority. If the UE determines to return to the first access network device to transmit the service, the UE can select a pre-configured departure time length. If the UE determines to transmit the service through the second access network device, the UE can select an infinite departure time length.

[0073] In a specific implementation of step S23, dedicated access parameters are received from the first access network device.

[0074] Furthermore, the dedicated access parameter may include at least one of the following: a dedicated random access preamble, a dedicated identifier Cell-Radio Network Temporary Identifier (C-RNTI), and a dedicated uplink transmission radio resource.

[0075] Specifically, the first access network device can allocate a dedicated random access preamble code to the UE, and notify the UE of the allocated access preamble code through an RRC release message. The timing corresponding to the dedicated random access preamble code can be after the UE leaves the device, that is, after the UE returns to the first access network device from the second access network device. The UE can use the dedicated random access preamble code to perform random access with the first access network device, avoiding the use of a public random access preamble code and conflicting with other UEs.

[0076] The first access network device can allocate a dedicated identifier C-RNTI for the UE. After the UE returns to the first access network device from the second access network device, it notifies the first access network device of the C-RNTI during the random access process, thereby eliminating the process of the first access network device temporarily allocating C-RNTI to the UE.

[0077] The first access network device may allocate dedicated uplink transmission wireless resources to the UE, and the UE may directly transmit data through the dedicated transmission resources after returning to the first access network device.

[0078] It should be pointed out that in the foregoing description, a dedicated random access preamble, a dedicated identifier C-RNTI and a dedicated uplink transmission wireless resource are used as examples. In fact, other appropriate dedicated access parameters can also achieve the same purpose. The embodiments of the present invention are not limited to the above three dedicated access parameters.

[0079] Furthermore, when the service priority of the second access network device is determined and it is determined that the service needs to be transmitted on the second access network device, the length of the departure time is determined to be infinite, and the dedicated access parameters include dedicated uplink transmission wireless resources.

[0080] Specifically, if the departure time notified by the UE is infinite, the first access network device may not allocate a dedicated random access preamble code or a dedicated identifier C-RNTI for the UE.

[0081] In the embodiment of the present invention, by setting the UE to determine and indicate the length of time for leaving the first access network device, the autonomy of the UE can be improved and data transmission can be achieved more flexibly.

[0082] Reference Figure 3 , Figure 3 1 is a data flow diagram of a third method for transmitting data in an embodiment of the present invention. The third method for transmitting data can be used on the UE side and can include steps S31 to S37. Each step is described below.

[0083] In step S31, UE31 transmits data with the first access network device 32;

[0084] In step S32, UE31 receives paging for itself from the second access network device 33;

[0085] In step S33, UE31 determines the length of the absence time;

[0086] In step S34, UE31 indicates the length of the absence time to the first access network device 32;

[0087] In step S35, UE31 receives the allocated dedicated random access preamble from the first access network device 32 via an RRC release message;

[0088] In step S36, UE31 establishes a connection with the second access network device 33;

[0089] In step S37, UE31 uses the dedicated random access preamble code to access the first access network device 32 again.

[0090] about Figure 3 For the principles, specific implementations and beneficial effects of steps S31 to S37 shown in FIG. Figure 2 The description of the method for transmitting data shown is not repeated here.

[0091] Reference Figure 4 , Figure 4 4 is a flowchart of a fourth method for transmitting data in an embodiment of the present invention. The fourth method for transmitting data can be used on the UE side, and can also include steps S41 to S44:

[0092] Step S41: Determine a departure time point and / or service status of leaving the first access network device;

[0093] Step S42: sending the departure time point and / or service status to the first access network device so that the first access network device determines the departure time length, or directly requesting the first access network device to determine the departure time length;

[0094] Step S43: receiving dedicated access parameters from the first access network device;

[0095] Step S44: when accessing the first access network device again, random access is performed using the dedicated access parameters.

[0096] In the specific implementation of step S41, the service status is selected from one or more of the following: the service priority of the second access network device is not determined, the service priority of the second access network device is determined and it is determined that the service needs to be returned to the first access network device to transmit the service, and the service priority of the second access network device is determined and it is determined that the service needs to be transmitted on the second access network device.

[0097] Specifically, after determining the departure time point, the UE can notify the first access network device of the departure time point; the UE can also only notify the first access network device of three situations of the service status, and the base station determines the departure time length; the UE can also notify the first access network device of the departure time point and the three situations of the service status.

[0098] Refer to Table 1, which shows three situations of the service status of the UE.

[0099] Table 1

[0100]

[0101] In the specific implementation of step S42, the first access network device can determine the length of time the UE is away according to the three situations, and allocate a dedicated random access preamble or other dedicated access resources to the UE accordingly.

[0102] Furthermore, for the three situations shown in Table 1, if the first access network device knows how long it takes for the UE to complete data transmission or signaling interaction in the second access network device, such as obtaining the information through interaction between base stations or through other network elements, dedicated access parameters can be allocated to the UE accordingly.

[0103] For the principles, specific implementations and beneficial effects of steps S43 to S44, please refer to the previous text and Figure 2 The relevant description will not be repeated here.

[0104] In an embodiment of the present invention, the UE is configured to send the departure time point and / or service status to the first access network device so that the first access network device determines the departure time length. Since the first access network device can determine the departure time length after information interaction with the second access network device or other network elements, this helps to improve the accuracy of determining the departure time length.

[0105] Furthermore, the method for transmitting data may also include: determining whether there are data packets that have not been successfully transmitted or segments of data packets that have not been successfully transmitted when leaving the first access network device; if so, performing one or more of the following: for downlink transmission, triggering a packet data fusion protocol (Packet Data Convergence Protocol, PDCP) status report, urging the PDCP entity on the first access network device side to retransmit the downlink data packet that has not been received; for downlink transmission, triggering an RLC status report, urging the radio link control (Radio Link Control, RLC) entity on the first access network device side to retransmit the downlink data packet that has not been received or a segment of the downlink data packet; for uplink transmission, retransmitting the uplink data packet that has not been successfully transmitted in the PDCP record; for uplink transmission, retransmitting the uplink data packet that has not been successfully transmitted in the RLC record or a segment of the uplink data packet; triggering a regular BSR; for uplink transmission, triggering POLL.

[0106] It should be pointed out that the above-mentioned method of transmitting data is related to the aforementioned "sending a leave indication message to the first access network device; receiving dedicated access parameters from the first access network device", and can occur before "sending a leave indication message to the first access network device" or after "sending a leave indication message to the first access network device".

[0107] In addition, the above method for transmitting data can be decoupled from the aforementioned "receiving dedicated access parameters from the first access network device". Even if the first access network device does not provide dedicated access parameters to the UE, the method for transmitting data described in this paragraph can be used as usual.

[0108] It should be noted that the RLC record may contain both unsuccessfully transmitted uplink data packets and unsuccessfully transmitted uplink data packet segments. For example, the entirety of data packet 32 ​​has not been successfully transmitted, and a portion of data packet 33 has not been successfully transmitted. At this point, the UE may need to transmit both the entirety of data packet 32 ​​and a portion of data packet 33.

[0109] Furthermore, when the UE determines that there is a PDCP data packet that needs to be retransmitted, an RLC data packet that needs to be retransmitted, or an RLC data packet segment that needs to be retransmitted, a regular buffer status report (Buffer State Report, BSR) may be triggered.

[0110] Furthermore, in the step of triggering the POLL field for uplink transmission, the purpose of the POLL field is to urge the other party to send an RLC status report. Here, the UE triggers the POLL to urge the base station to send the RLC status report.

[0111] Specifically, when the UE transmits data to an access network device (such as a base station), the data packet is processed in sequence by the Service Data Adaptation Protocol (SDAP), Packet Data Convergence Protocol (PDCP), RLC, and Medium Access Control (MAC) layers before being transmitted through the physical layer.

[0112] Take two data bearers between the UE and the base station as an example. Each data bearer uses its own SDAP, PDCP, and RLC entities. The entities corresponding to the two bearers are represented by green and blue respectively. All data bearers share the underlying MAC and physical layer processing entities. Due to the instability of the wireless interface signal, the outgoing data may not be correctly received by the receiver, so each layer needs to retransmit to improve the probability of correct transmission of the data packet. Among them, PDCP and RLC record the reception of the data and trigger retransmission under specific conditions.

[0113] Regarding PDCP, for downlink data, i.e., data sent from the base station to the UE, the PDCP entity on the base station side assigns a sequence number to each data packet sent. For example, if the packet sequence number is 1-5, the UE side has correctly received data packets 1, 3, and 5, but has not correctly received data packets 2 and 4. For uplink data, i.e., data sent from the UE to the base station, the PDCP entity on the UE side assigns a sequence number to each data packet sent. For example, if the packet sequence number is 34-38, the base station side has correctly received data packets 34, 37, and 38, but has not correctly received data packets 35 and 36. During handover, the PDCP entity on the receiving side generates a PDCP status report based on its own reception status, notifying the sending side: which data packets have not been received, and the sending side retransmits these data packets.

[0114] In an embodiment of the present invention, by setting up a PDCP status report to be triggered for downlink transmission, the PDCP entity on the first access network device side is urged to retransmit the downlink data packets that have not been received; for uplink transmission, the uplink data packets that have not been successfully transmitted in the PDCP record are retransmitted; the data packets that have not been successfully transmitted can be reasonably arranged to improve the data continuity and effectiveness after the UE leaves the first access network device.

[0115] Regarding RLC, for downlink data, that is, data sent from the base station to the UE, the RLC entity on the base station side assigns a sequence number to each data packet sent. For example, if the packet sequence number is 5-9, the UE side has correctly received data packets 5, 7, and 9, but has not yet correctly received a portion of the fragments of data packet 6 and data packet 8. The existence of a portion of the fragments of data packet 6 here is because RLC will segment the data packets according to the transmission capacity of the wireless interface. If the RLC entity of the sender segments data packet 6 and puts it into different transmission blocks, and transmits them separately through the wireless interface, the transmission of these transmission blocks is independent. For the receiver, some transmission blocks are received correctly, while some transmission blocks are not received correctly. The RLC entity of the receiver believes that only a portion of the fragments of data packet 6 are received.

[0116] For uplink data, i.e., data sent from the UE to the base station, the RLC entity on the UE side assigns a sequence number to each data packet sent. For example, the packet sequence number is 52-56. The base station has correctly received data packets 52, 55, and 56, but has not correctly received part of data packet 53 and data packet 54. The RLC layer of the receiver notifies the RLC of the sender through a status report: which data packets have not been received, and which data packet segments have not been received. The sender performs RLC retransmission based on the status report, and only retransmits the data packets and segments that have not been correctly received as indicated in the status report. The conditions for the receiver to trigger the status report are detailed in the protocol. In addition, the sender can also notify the receiver to trigger the status report through a poll indication.

[0117] In an embodiment of the present invention, by setting up a triggering RLC status report for downlink transmission, the RLC entity on the first access network device side is urged to retransmit the downlink data packet or segment of the downlink data packet that has not been received; for uplink transmission, the uplink data packet or segment of the uplink data packet that has not been successfully transmitted in the RLC record is retransmitted; the data packets that have not been successfully transmitted can be reasonably arranged to improve the data continuity and effectiveness after the UE leaves the first access network device.

[0118] Regarding conventional BSR, the wireless transmission resources of the wireless access network system are uniformly scheduled by the base station, that is, the base station determines the allocation of wireless resources for downlink and uplink data. For uplink data, the UE needs to notify the base station that a certain amount of Byte data needs to be transmitted. The base station allocates uplink wireless resources to the UE based on the amount of data and the wireless channel status of the UE. The UE uses the allocated uplink wireless resources to transmit data. The UE indicates the amount of uplink data to the base station through the BSR.

[0119] The existing protocol specifies several types of BSR and triggering conditions. If the UE has new data to transmit and the priority of the new data is higher than the priority of all the data in the cache, the UE triggers a regular BSR. Regular BSR has the highest priority and will trigger SR to request the base station to allocate wireless resources.

[0120] In the embodiment of the present invention, the UE can indicate the uplink data volume to the base station by setting to trigger a regular BSR.

[0121] Furthermore, the method for transmitting data may also include: when counting the amount of data indicated by the above-mentioned conventional BSR, at least one of the following items is satisfied: the amount of data includes the amount of data packets determined by the UE in the PDCP that need to be retransmitted; the amount of data includes the data packets or segments of data packets determined by the UE in the RLC that need to be retransmitted; the amount of data includes the segments of data packets determined by the UE in the RLC that need to be retransmitted.

[0122] Specifically, when the UE counts the amount of data indicated by the conventional BSR, it may include only the data packets that need to be retransmitted in the PDCP, or only the data packets or segments that need to be retransmitted in the RLC, or both, which is not limited here.

[0123] In an embodiment of the present invention, by setting steps such as triggering a PDCP status report, triggering an RLC status report, retransmitting uplink data packets that have not been successfully transmitted in the PDCP record, retransmitting uplink data packets that have not been successfully transmitted in the RLC record or segments of uplink data packets, and triggering a regular BSR, it is possible to reasonably arrange the data packets that have not been successfully transmitted, thereby improving the data continuity and effectiveness after the UE leaves the first access network device.

[0124] Reference Figure 5 , Figure 5 is a partial flow chart of a fifth method for transmitting data in an embodiment of the present invention. The fifth method for transmitting data can be used on the UE side and may also include Figure 1 The steps S11 to S13 shown may further include steps S51 to S53:

[0125] Step S51: when leaving the first access network device, determining whether there is a data packet or a segment of a data packet that has not been successfully transmitted;

[0126] Step S52: if there is a data packet or a segment of a data packet that has not been successfully transmitted, determining whether the service type of the data packet that has not been successfully transmitted belongs to a data cluster service;

[0127] Step S53: If it belongs to a data cluster service, then the transmission of the current cluster is abandoned, and any data packets in the current cluster are not counted in the BSR; or, if it belongs to a data cluster service, then the transmission of the current cluster is continued, and the data packets and / or data packet segments that have not been transmitted in the current cluster, as well as the data packets and / or data packet segments that need to be retransmitted in the current cluster are counted in the BSR.

[0128] Specifically, according to the 3GPP protocol, the base station classifies the priority of service data through the bearer. Each data packet in the bearer has the same priority for the access layer. Each data packet is transmitted independently and there is no connection between them. However, this is a simplified model. From the perspective of the application layer, there is a natural connection between the actual service data packets. For example, an image frame is divided into several data packets at the IP layer. When it reaches the access layer, it is considered to be several data packets that are not related to each other. These data packets are decoded and restored to an image frame at the application layer of the receiver. If only part of the data packets are correctly transmitted, the application layer of the receiver cannot restore the complete image frame. In order to allow wireless transmission to take into account the natural connection between data packets during transmission, there are now some solutions in the industry, such as adding tags in the middle of the data packets to notify the base station / UE: which data packets are a group. The base station / UE optimizes the data transmission of the wireless interface based on this information.

[0129] It should be noted that the above two judgment conditions can be parallel, that is, there may be no order relationship. For example, it can be determined first whether it belongs to a data cluster service, and then it can be determined whether there are data packets or data packet segments that have not been successfully transmitted.

[0130] In another specific implementation of the embodiment of the present invention, the method for transmitting data may also include: when leaving the first access network device, determining whether the current service type belongs to a data cluster service; if it belongs to a data cluster service, determining whether there are data packets or segments of data packets that have not been successfully transmitted; if there are data packets or segments of data packets that have not been successfully transmitted, abandoning transmission of the current cluster, and not counting any data packets in the current cluster in the BSR.

[0131] In the specific implementation of the embodiment of the present invention, if the service data belongs to a service with a data cluster, that is, some data packets have a natural connection, such as image service, AR, VR, etc., for the cluster currently being transmitted, the UE selects one of the following actions by itself or under the instruction of the base station:

[0132] Abandon the transmission of the current cluster and do not count the data packets that have been transmitted in the current cluster in the BSR;

[0133] Continue to complete the transmission of the current cluster and include the packets that have not been transmitted in the current cluster in the BSR.

[0134] Furthermore, the method for transmitting data further includes: if the data packet does not belong to the data cluster service, then the data packet that has not been transmitted is no longer transmitted through the air interface of the first access network device.

[0135] Reference Figure 6 , Figure 6 It is a schematic diagram of a working scenario of data cluster transmission in an embodiment of the present invention.

[0136] As shown in the figure, if the current UE has two clusters that have not been correctly transmitted, 3 / 4 packets of the first cluster have not been correctly transmitted, and the second cluster has correctly transmitted two data packets 6 and 7, but there are still three data packets that have not been transmitted. If the UE is determined to complete the second cluster, the data volume of these three data packets needs to be counted in the BSR; if the UE is determined to abandon the second cluster, the data volume of these three data packets will not be counted.

[0137] In an embodiment of the present invention, if there is a data packet or a segment of a data packet that has not been successfully transmitted, a step is set to determine whether the service type of the data packet that has not been successfully transmitted belongs to a data cluster service, and if it belongs to a data cluster service, the transmission of the current cluster is abandoned, and the data packet that has been transmitted in the current cluster is not counted in the BSR; or the transmission of the current cluster is continued, and the data packet that has not been transmitted in the current cluster is counted in the BSR. It is possible to further reasonably arrange the data packets that have not been successfully uploaded, thereby improving the data consistency and effectiveness after the UE leaves the first access network device.

[0138] Reference Figure 7 , Figure 7 4 is a flowchart of a sixth data transmission method in an embodiment of the present invention. The sixth data transmission method can be used for a first access network device, and can also include steps S71 to S72:

[0139] Step S71: receiving a leaving indication message from the UE;

[0140] Step S72: Send dedicated access parameters to the UE, so that the UE uses the dedicated access parameters to perform random access when accessing again.

[0141] Further, receiving the departure indication information from the UE includes: receiving a departure time length from the UE.

[0142] Furthermore, the departure time length satisfies at least one of the following: when the UE has not determined the service priority of the second access network device, the departure time length is a first preconfigured departure time length; when the UE determines the service priority of the second access network device and determines that it is necessary to return to the first access network device to transmit the service, the departure time length is a second preconfigured departure time length; when the UE determines the service priority of the second access network device and determines that it is necessary to transmit the service on the second access network device, the departure time length is infinite.

[0143] Furthermore, receiving departure indication information from the UE includes: receiving a departure time point and / or service status from the UE, or receiving a direct request to determine the length of the departure time; determining the length of the departure time; wherein the service status is selected from one or more of the following: the UE has not determined the service priority of the second access network device, the UE has determined the service priority of the second access network device and determined that it is necessary to return to the first access network device to transmit the service, and the UE has determined the service priority of the second access network device and determined that it is necessary to transmit the service on the second access network device.

[0144] Furthermore, the determining of the departure time length is selected from: interacting with the second access network device to determine the departure time length; interacting with other network elements to determine the departure time length; and determining the departure time length by itself.

[0145] Optionally, the first access network device determines the second access network device according to the leaving indication information of the UE. It should be noted that if the first access network device wants to interact with the second access network device, it must first determine the second access network device, otherwise the interaction is impossible.

[0146] Furthermore, in order to determine the second access network device, it may be configured that the leave indication information from the UE includes an identifier of the second access network device.

[0147] The identifier may be information uniquely used to identify the second access network device, for example, an IP address or a device identifier of the second access network device.

[0148] Furthermore, the dedicated access parameter includes at least one of the following: a dedicated random access preamble, a dedicated identifier C-RNTI, and a dedicated uplink transmission radio resource.

[0149] Furthermore, the method for transmitting data also includes: determining whether there are data packets that have not been successfully transmitted or segments of data packets that have not been successfully transmitted when the UE leaves; if so, performing one or more of the following: for uplink transmission, triggering a PDCP status report to urge the UE-side PDCP entity to retransmit the uplink data packet that has not been received; for uplink transmission, triggering an RLC status report to urge the UE-side RLC entity to retransmit the uplink data packet that has not been received or the segment of the uplink data packet; for downlink transmission, retransmitting the downlink data packet that has not been successfully transmitted in the PDCP record; for downlink transmission, retransmitting the downlink data packet that has not been successfully transmitted in the RLC record or the segment of the downlink data packet.

[0150] In an embodiment of the present invention, by setting the first access network device to receive departure indication information from the UE and then sending dedicated access parameters to the UE, the UE can use the dedicated access parameters to perform random access when accessing the first access network device again. Compared with the prior art in which the access process is complicated and prone to conflicts when the UE leaves the first access network device and accesses again, the solution of the embodiment of the present invention can reduce the access parameters that need to be reconfigured and reduce the possibility of conflicts by using dedicated access parameters.

[0151] For the principle, specific implementation and beneficial effects of the sixth method of transmitting data, please refer to the previous text and Figures 2 to 6 The related description about the method of transmitting data shown is not repeated here.

[0152] Reference Figure 8 , Figure 8 1 is a schematic diagram of a data transmission device according to an embodiment of the present invention. The data transmission device may be used on a UE side and may further include:

[0153] A first sending module 81, configured to send a leave indication message to a first access network device;

[0154] A first receiving module 82, configured to receive dedicated access parameters from the first access network device;

[0155] The access module 83 is used to use the dedicated access parameters to perform random access when accessing the first access network device again.

[0156] For the principles, specific implementations and beneficial effects of the data transmission device, please refer to the previous description of the method for transmitting data, which will not be repeated here.

[0157] Reference Fig. 9 , Fig. 9 1 is a schematic diagram of the structure of another data transmission device in an embodiment of the present invention. The another data transmission device can be used in a first access network device, and may further include:

[0158] A second receiving module 91, configured to receive leave indication information from a UE;

[0159] The second sending module 82 is used to send dedicated access parameters to the UE, so that the UE uses the dedicated access parameters to perform random access when accessing again.

[0160] For the principles, specific implementations and beneficial effects of the data transmission device, please refer to the previous description of the method for transmitting data, which will not be repeated here.

[0161] The technical solution of this invention can be applied to 5G (5Generation) communication systems, as well as 4G and 3G communication systems, and can also be applied to various new communication systems in the future, such as 6G and 7G.

[0162] The embodiment of the present invention further provides a storage medium on which a computer program is stored, and when the computer program is executed by a processor, the steps of the above method are executed. The storage medium may be a computer-readable storage medium, for example, may include a non-volatile memory or a non-transitory memory, and may also include an optical disk, a mechanical hard disk, a solid-state hard disk, etc.

[0163] The embodiment of the present invention further provides a terminal, including a memory and a processor, wherein the memory stores a computer program that can be run on the processor, and the processor executes the steps of the above method when running the computer program. The terminal includes but is not limited to terminal devices such as mobile phones, computers, and tablet computers.

[0164] The embodiment of the present invention further provides a first access network device, including a memory and a processor, wherein the memory stores a computer program that can be run on the processor, and the processor executes the steps of the above method when running the computer program. The first access network device includes but is not limited to a base station.

[0165] The technical solution of the present invention is also applicable to different network architectures, including but not limited to relay network architecture, dual-link architecture, Vehicle-to-Everything (vehicle-to-anything communication) architecture and other architectures.

[0166] The core network described in the embodiments of the present application may be an evolved packet core network (EPC for short), a 5G Core Network (5G Core Network), or a new core network in a future communication system. The 5G Core Network is composed of a group of devices, and implements access and mobility management functions (AMF) that implement mobility management and other functions, user plane functions (UPF) that provide packet routing and forwarding and QoS (Quality of Service) management and other functions, and session management functions (SMF) that provide session management, IP address allocation and management and other functions. The EPC may be composed of an MME that provides mobility management, gateway selection and other functions, a Serving Gateway (S-GW) that provides packet forwarding and other functions, and a PDN Gateway (P-GW) that provides terminal address allocation, rate control and other functions.

[0167] The base station (BS) in the embodiment of the present application, which may also be referred to as a base station device, is a device deployed in a radio access network (RAN) to provide wireless communication functions. For example, the device that provides base station functions in a 2G network includes a base transceiver station (BTS), the device that provides base station functions in a 3G network includes a node B (NodeB), the device that provides base station functions in a 4G network includes an evolved node B (evolvedNodeB, eNB), and in wireless local area networks (WLANs), the device that provides base station functions is an access point (AP), and the device that provides base station functions in 5G New Radio (NR) is a gNB, and a node B (ng-eNB) that continues to evolve, wherein the gNB and the terminal use NR technology for communication, and the ng-eNB and the terminal use E-UTRA (Evolved Universal Terrestrial Radio Access) technology for communication, and both the gNB and the ng-eNB can be connected to the 5G core network. The base station in the embodiment of the present application also includes a device that provides base station functions in a new communication system in the future.

[0168] The base station controller in the embodiment of the present application is a device for managing base stations, such as a base station controller (BSC) in a 2G network, a radio network controller (RNC) in a 3G network, and may also refer to a device for controlling and managing base stations in future new communication systems.

[0169] The network side network in the embodiment of the present invention refers to a communication network that provides communication services for a terminal, including a base station of a wireless access network, and may also include a base station controller of the wireless access network, and may also include equipment on the core network side.

[0170] The terminal in the embodiments of the present application may refer to various forms of user equipment (UE), access terminal, user unit, user station, mobile station, mobile station (MS), remote station, remote terminal, mobile device, user terminal, terminal equipment, wireless communication equipment, user agent or user device. The terminal equipment may also be a cellular phone, a cordless phone, a Session Initiation Protocol (SIP) phone, a Wireless Local Loop (WLL) station, a Personal Digital Assistant (PDA), a handheld device with wireless communication function, a computing device or other processing device connected to a wireless modem, a vehicle-mounted device, a wearable device, a terminal device in a future 5G network or a terminal device in a future evolved Public Land Mobile Network (PLMN), etc., and the embodiments of the present application are not limited to this.

[0171] The embodiment of the present application defines the unidirectional communication link from the access network to the terminal as a downlink, the data transmitted on the downlink is downlink data, and the transmission direction of the downlink data is called the downlink direction; and the unidirectional communication link from the terminal to the access network is an uplink, the data transmitted on the uplink is uplink data, and the transmission direction of the uplink data is called the uplink direction.

[0172] It should be understood that the term "and / or" in this article is only a description of the association relationship of the associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article indicates that the associated objects before and after are in an "or" relationship.

[0173] The "plurality" appearing in the embodiments of the present application refers to two or more.

[0174] The first, second, etc. descriptions appearing in the embodiments of the present application are only used for illustration and distinction of the description objects. There is no order, nor do they indicate any special limitation on the number of devices in the embodiments of the present application, and cannot constitute any limitation on the embodiments of the present application.

[0175] The "connection" that appears in the embodiments of the present application refers to various connection methods such as direct connection or indirect connection to achieve communication between devices, and the embodiments of the present application do not impose any limitations on this.

[0176] Although the present invention is disclosed as above, the present invention is not limited thereto. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the scope defined by the claims.

Claims

1. A method for transmitting data, characterized in that: The following steps are involved: Sending a leave indication message to the first access network device; Receiving dedicated access parameters from the first access network device; When accessing the first access network device again, using the dedicated access parameters for random access; The method further comprises: Determining whether there is a data packet that has not been successfully transmitted or a segment of a data packet that has not been successfully transmitted when leaving the first access network device; If present, do one or more of the following: For downlink transmission, trigger PDCP status report; For downlink transmission, trigger RLC status report; For uplink transmission, retransmit uplink data packets that have not been successfully transmitted in the PDCP record; For uplink transmission, retransmit the uplink data packet or uplink data packet segment that has not been successfully transmitted in the RLC record; Triggering regular BSR; For uplink transmission, POLL is triggered.

2. The method for transmitting data according to claim 1, characterized in that: Sending the leave indication information to the first access network device includes: Determine the length of time of leaving the first access network device; The absence time length is indicated to the first access network device.

3. The method for transmitting data according to claim 2, characterized in that: Determine that the length of time of leaving the first access network device satisfies at least one of the following: When the service priority of the second access network device is not determined, determining the departure time length to be a first preconfigured departure time length; When the service priority of the second access network device is determined and it is determined that the service needs to be transmitted back to the first access network device, the departure time length is determined to be a second preconfigured departure time length; when the service priority of the second access network device is determined and it is determined that the service needs to be transmitted on the second access network device, the departure time length is determined to be infinite.

4. The method for transmitting data according to claim 1, characterized in that: Sending the leave indication information to the first access network device includes: Determine a departure time point and / or a service status of leaving the first access network device; Sending the departure time point and / or service status to the first access network device, or directly requesting the first access network device to determine the departure time length, so that the first access network device determines the departure time length; Among them, the service status is selected from one or more of the following: the service priority of the second access network device has not been determined, the service priority of the second access network device has been determined and it is determined that the service needs to be returned to the first access network device to transmit the service, and the service priority of the second access network device has been determined and it is determined that the service needs to be transmitted on the second access network device.

5. The method for transmitting data according to claim 1, characterized in that: The dedicated access parameter includes at least one of the following: Dedicated random access preamble, dedicated identifier C-RNTI and dedicated uplink transmission radio resources.

6. The method for transmitting data according to claim 1, characterized in that: Also includes: When counting the amount of data indicated by the conventional BSR, at least one of the following conditions is met: The data volume includes the data volume of the data packet that needs to be retransmitted as determined by the UE in the PDCP; The data volume includes data packets determined by the UE in the RLC that need to be retransmitted; The data volume includes segments of data packets in the RLC that are determined by the UE to need to be retransmitted.

7. The method for transmitting data according to claim 1, characterized in that: Also includes: When leaving the first access network device, determining whether there is a data packet or a segment of a data packet that has not been successfully transmitted; If there is a data packet or a segment of a data packet that has not been successfully transmitted, determining whether the service type of the data packet that has not been successfully transmitted belongs to a data cluster service; If it belongs to a data cluster service, the transmission of the current cluster is abandoned, and any data packets in the current cluster are not counted in the BSR; or, If it is a data cluster service, the transmission of the current cluster continues, and the data packets and / or data packet segments that have not been transmitted in the current cluster, as well as the data packets and / or data packet segments that need to be retransmitted in the current cluster are counted in the BSR.

8. The method for transmitting data according to claim 1, characterized in that: Also includes: When leaving the first access network device, determining whether the current service type belongs to a data cluster service; If it is a data cluster service, determining whether there is a data packet or a segment of a data packet that has not been successfully transmitted; If there are data packets or fragments of data packets that have not been successfully transmitted, the transmission of the current cluster is abandoned, and any data packets in the current cluster are not counted in the BSR.

9. A method for transmitting data, characterized in that: The following steps are involved: receiving a leave indication message from the UE; Sending dedicated access parameters to the UE, so that the UE uses the dedicated access parameters to perform random access when accessing again; The method further comprises: Determine whether there is a data packet that has not been successfully transmitted or a segment of a data packet that has not been successfully transmitted when the UE leaves; If present, do one or more of the following: For uplink transmission, trigger PDCP status report; For uplink transmission, trigger RLC status report; For downlink transmission, retransmit the downlink data packets that have not been successfully transmitted in the PDCP record; For downlink transmission, the downlink data packet or the segment of the downlink data packet that has not been successfully transmitted in the RLC record is retransmitted.

10. The method for transmitting data according to claim 9, characterized in that: Receiving the leaving indication information from the UE includes: An absence time length is received from the UE.

11. The method for transmitting data according to claim 10, characterized in that: The length of the absence time satisfies at least one of the following: In the case where the UE does not determine the service priority of the second access network device, the departure time length is a first preconfigured departure time length; When the UE determines the service priority of the second access network device and determines that it needs to return to the first access network device to transmit the service, the departure time length is a second preconfigured departure time length; When the UE determines the service priority of the second access network device and determines that the service needs to be transmitted on the second access network device, the length of the departure time is infinite.

12. The method for transmitting data according to claim 9, characterized in that: Receiving the leaving indication information from the UE includes: receiving a departure time point and / or a service status from the UE, or receiving a direct request to determine the departure time length; Determine the length of time you will be away; Among them, the service status is selected from one or more of the following: the UE has not determined the service priority of the second access network device, the UE has determined the service priority of the second access network device and determined that it is necessary to return to the first access network device to transmit the service, and the UE has determined the service priority of the second access network device and determined that it is necessary to transmit the service on the second access network device.

13. The method for transmitting data according to claim 12, characterized in that: The determined length of time of absence is selected from: Performing information interaction with the second access network device to determine the length of the absence time; Interacting with other network elements to determine the length of the absence time; Determine the length of time you wish to be away from home.

14. The method for transmitting data according to claim 9, characterized in that: The dedicated access parameter includes at least one of the following: Dedicated random access preamble, dedicated identifier C-RNTI and dedicated uplink transmission radio resources.

15. A device for transmitting data, characterized in that: include: A first sending module, used to send a leave indication message to the first access network device; A first receiving module, configured to receive dedicated access parameters from the first access network device; An access module, configured to perform random access using the dedicated access parameters when accessing the first access network device again; The device also includes: A first determination module, used to determine whether there is a data packet that has not been successfully transmitted or a segment of a data packet that has not been successfully transmitted when leaving the first access network device; If present, do one or more of the following: For downlink transmission, trigger PDCP status report; For downlink transmission, trigger RLC status report; For uplink transmission, retransmit uplink data packets that have not been successfully transmitted in the PDCP record; For uplink transmission, retransmit the uplink data packet or uplink data packet segment that has not been successfully transmitted in the RLC record; Triggering regular BSR; For uplink transmission, POLL is triggered.

16. A device for transmitting data, characterized in that: include: A second receiving module, configured to receive leave indication information from a UE; A second sending module, configured to send a dedicated access parameter to the UE, so that the UE uses the dedicated access parameter for random access when accessing again; The device also includes: The second determination module is used to determine whether there is a data packet that has not been successfully transmitted or a segment of a data packet that has not been successfully transmitted when the UE leaves; If present, do one or more of the following: For uplink transmission, trigger PDCP status report; For uplink transmission, trigger RLC status report; For downlink transmission, retransmit the downlink data packets that have not been successfully transmitted in the PDCP record; For downlink transmission, the downlink data packet or the segment of the downlink data packet that has not been successfully transmitted in the RLC record is retransmitted.

17. A storage medium having computer instructions stored thereon, characterized in that: When the computer instructions are executed, the steps of the method for transmitting data according to any one of claims 1 to 8 are executed, or the steps of the method for transmitting data according to any one of claims 9 to 14 are executed.

18. A UE comprising a memory and a processor, wherein the memory stores computer instructions that can be executed on the processor, characterized in that: When the processor runs the computer instructions, the processor performs the steps of the method for transmitting data according to any one of claims 1 to 8.

19. A first access network device, comprising a memory and a processor, wherein the memory stores computer instructions that can be executed on the processor, characterized in that: When the processor runs the computer instructions, the processor performs the steps of the method for transmitting data according to any one of claims 9 to 14.

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