Data transmission method, storage medium, electronic apparatus and computer program product

Abstract

Embodiments of the present disclosure provide a data transmission method, a storage medium, an electronic apparatus, and a computer program product. The data transmission method comprises: a UE sends a data transmission request to a base station, the data transmission request carrying a UE ID and a service initiation or service registration request; and the UE receives a contention resolution identifier from the base station, and performs data transmission by means of a dedicated signaling radio bearer.

Description

Data transmission methods, storage media, electronic devices and computer program products

[0001] Cross-references to related applications

[0002] This disclosure is based on and claims priority to Chinese Patent Application No. 202411643425.4, filed on November 15, 2024, entitled “Data Transmission Method, Storage Medium, Electronic Device and Computer Program Product”, the entire contents of which are incorporated herein by reference. Technical Field

[0003] This disclosure relates to the field of communications, and more specifically, to a data transmission method, a storage medium, an electronic device, and a computer program product. Background Technology

[0004] 6G networks will be integrated with communication, sensing, computing, and intelligence, requiring a large number of devices to connect to the network. These IoT devices are characterized by low cost and low power consumption. If every data transmission requires entering a connected state, it will consume a lot of power and increase complexity. Summary of the Invention

[0005] This disclosure provides a data transmission method, a storage medium, an electronic device, and a computer program product.

[0006] According to one embodiment of this disclosure, a data transmission method is provided, comprising: a user equipment (UE) sending a data transmission request to a base station, the data transmission request carrying a user identifier (UE ID) and a service initiation or service registration request; the UE receiving a contention resolution identifier from the base station and transmitting data via a dedicated signaling radio bearer.

[0007] According to another embodiment of this disclosure, a data transmission method is provided, comprising: a base station receiving a data transmission request from a user equipment (UE), the data transmission request carrying a user identifier (UE ID) and a service initiation or service registration request; the base station sending a contention resolution identifier to the UE and transmitting data via a dedicated signaling radio bearer.

[0008] According to yet another embodiment of this disclosure, a computer-readable storage medium is also provided, wherein a computer program is stored therein, wherein the computer program is configured to perform the steps in any of the above method embodiments when it is run.

[0009] According to yet another embodiment of this disclosure, an electronic device is also provided, including a memory and a processor, wherein the memory stores a computer program and the processor is configured to run the computer program to perform the steps in any of the above method embodiments.

[0010] According to yet another embodiment of this disclosure, a computer program product is also provided, including a computer program that, when executed by a processor, implements the steps in any of the above method embodiments. Attached Figure Description

[0011] Figure 1 is a hardware structure block diagram of a mobile terminal using the data transmission method implemented in the embodiments of the present disclosure.

[0012] Figure 2 is a flowchart of a data transmission method according to an embodiment of the present disclosure;

[0013] Figure 3 is another flowchart of the data transmission method according to an embodiment of the present disclosure;

[0014] Figure 4 is a flowchart illustrating the data transmission method initiated by the UE for the first data transmission service according to an embodiment of this disclosure.

[0015] Figure 5 is a flowchart illustrating the process of SRBx sending data to the core network according to an embodiment of this disclosure.

[0016] Figure 6 is another flowchart illustrating the process of SRBx sending data to the core network according to an embodiment of this disclosure.

[0017] Figure 7 is a flowchart illustrating the data transmission method initiated by the UE for a data transmission service according to an embodiment of this disclosure. Detailed Implementation

[0018] The embodiments of this disclosure will be described in detail below with reference to the accompanying drawings and examples.

[0019] It should be noted that the terms "first," "second," etc., in the specification, claims, and drawings of this disclosure are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.

[0020] In related technologies, although Small Data Transmission (SDT) technology was introduced in R17, it also requires the device to support the connected state. The UE needs to enter the connected state first, receive the RRC connection release signaling and then enter the inactive state (configure the dedicated bearer identifier used for small data transmission). If the UE has uplink data to transmit later, the UE can initiate a connection reply request in the inactive state and transmit data in the inactive state.

[0021] The normal procedure for Random Access-Small Data Transmission (RA-SDT) in the current protocol is as follows: If the User Equipment (UE) needs to enter the SDT state for the first time, it must first enter the connected state, receive the Radio Resource Control (RRC) connection release signaling, and then transition to the inactive state (configuring the dedicated bearer identifier used for small data transmission). If the UE subsequently has uplink data to transmit, it can initiate an RRC Resume Request in the inactive state and transmit data there. The initial entry process for the UE into the SDT state is relatively long. If uplink data transmission is required later, the RRC Resume Request is re-initiated, and the data transmission process is repeated. The re-initiation of the RRC Resume Request procedure is as follows:

[0022] Step 1: gNB sends the SDT common configuration (sdt-ConfigCommon) in SIB1;

[0023] Step 2: When the UE enters the inactive state, the gNB configures the SDT resources through the RRC Release message;

[0024] Step 3: When the UE needs to restore the RRC connection, determine whether an SDT procedure can be initiated based on the conditions for "SDT Initiation". Assuming that RA-SDT can be initiated after the determination, proceed to Step 4;

[0025] Step 4: The UE uses the RA-SDT resources configured in Step 1 to send msg1;

[0026] Step 5, UE receives msg2;

[0027] Step 6, the UE sends msg3 (carrying RRC Resume Request + uplink small data (UL small data));

[0028] Step 7: The UE receives msg4 (written with UE Contention Resolution Identity MAC CE + optional DL small data). After the contention is resolved successfully, the UE is considered to have successfully entered the SDT process and can start receiving and sending subsequent small data.

[0029] Steps 8-9: Use dynamic scheduling to transmit subsequent small data.

[0030] Step 10: The gNB sends an RRC Release message to notify the UE to end the SDT process and re-enter the INACTIVE state.

[0031] The method embodiments provided in this disclosure can be executed in a mobile terminal, computer terminal, or similar computing device. Taking a mobile terminal as an example, FIG1 is a hardware structure block diagram of a mobile terminal running the data transmission method of the method embodiments of this disclosure. As shown in FIG1, the mobile terminal may include one or more (only one is shown in FIG1) processors 102 (processor 102 may include, but is not limited to, processing devices such as microprocessors MCUs or programmable logic devices FPGAs) and a memory 104 for storing data. The mobile terminal may also include a transmission device 106 for communication functions and an input / output device 108. It will be understood by those skilled in the art that the structure shown in FIG1 is only illustrative and does not limit the structure of the mobile terminal. For example, the mobile terminal may also include more or fewer components than shown in FIG1, or have a different configuration than shown in FIG1.

[0032] The memory 104 can be used to store computer programs, such as application software programs and modules, like the computer program corresponding to the data transmission method in this embodiment. The processor 102 executes various functional applications and data processing by running the computer program stored in the memory 104, thus implementing the above-described method. The memory 104 may include high-speed random access memory and non-volatile memory, such as one or more magnetic storage devices, flash memory, or other non-volatile solid-state memory. In some instances, the memory 104 may further include memory remotely located relative to the processor 102, and these remote memories can be connected to the mobile terminal via a network. Examples of such networks include, but are not limited to, the Internet, corporate intranets, local area networks, mobile communication networks, and combinations thereof.

[0033] The transmission device 106 is used to receive or send data via a network. Specific examples of the network described above may include a wireless network provided by the mobile terminal's communication provider. In one example, the transmission device 106 includes a Network Interface Controller (NIC), which can connect to other network devices via a base station to communicate with the Internet. In another example, the transmission device 106 may be a Radio Frequency (RF) module, used for wireless communication with the Internet.

[0034] This disclosure provides a data transmission method to at least solve the problem of complex data transmission processes in communication networks in related technologies. Figure 2 is a flowchart of the data transmission method according to an embodiment of this disclosure. As shown in Figure 2, the process includes the following steps:

[0035] In step S202, the UE sends a data transmission request to the base station. The data transmission request carries the UE ID and a service initiation or service registration request.

[0036] In this embodiment of the disclosure, the data transmission request sent by the UE to the base station can be a data transmission request corresponding to a small data transmission. The data transmission request (CFT Request) is a newly defined RRC message. Since it does not need to carry the RRC connection establishment request message, the CFT Request carries the UE ID and the traditional initiation request message. The traditional initiation request includes a service initiation or service registration request.

[0037] In one exemplary embodiment, the data transmission request is further used to establish a dedicated signaling radio bearer, which uses a default-configured Packet Data Convergence Protocol (PDCP), Radio Link Control (RLC), or Medium Access Control (MAC).

[0038] In this embodiment of the disclosure, the aforementioned dedicated signaling radio bearer is also used to carry out subsequent processes such as secure establishment between the base station and the UE.

[0039] In one exemplary embodiment, the data transmission request is scrambled using a first temporary Cell Radio Network Temporary Identifier (temp C-RNTI), and the radio link control corresponding to the data transmission request uses the Transparent TM mode.

[0040] In this embodiment of the disclosure, before the UE sends a data transmission request to the base station, it first initiates random access to the base station.

[0041] In one exemplary embodiment, before the UE sends a data transmission request to the base station, the method further includes: the UE sending a random access request to the base station based on random access resources dedicated to data transmission; and the UE receiving a random access response from the base station, wherein the random access response carries a first temporary radio network identifier.

[0042] In step S204, the UE receives a contention resolution identifier from the base station and transmits data via a dedicated signaling radio bearer.

[0043] In one exemplary embodiment, the UE receives a contention resolution identifier from the base station, including: the UE receiving the contention resolution identifier from the base station through a Media Access Control Code Element (MAC CE).

[0044] In one exemplary embodiment, the contention resolution identifier is scrambled with a second temporary radio network identifier, and after the UE successfully contends for the contention, the second temporary radio network identifier is converted to a second radio network identifier.

[0045] In this embodiment of the disclosure, the first temporary wireless network identifier scrambling and the second temporary wireless network identifier scrambling are the same temporary wireless network identifier scrambling, and the distinction between "first" and "second" is only made in order.

[0046] In this embodiment of the disclosure, the base station uses MAC CE to transmit the contention resolution result. This contention resolution result can be transmitted using a conventional UE Contention Resolution Identity MAC CE, scrambled with a second temp C-RNTI. Upon successful contention, the second temp C-RNTI becomes the second C-RNTI, and subsequent air interface scrambles using this second C-RNTI.

[0047] In one exemplary embodiment, after the UE receives a contention resolution identifier from the base station, the method further includes: determining that the terminal enters a first state, wherein the first state supports data transmission.

[0048] In one exemplary embodiment, the UE transmits data via a dedicated signaling radio bearer, including: in response to the UE initiating a data transmission service, the UE establishes a dedicated signaling radio bearer, activates radio access network security, and transmits data via the dedicated signaling radio bearer.

[0049] In this embodiment of the disclosure, the first state includes one of the following: idle state, inactive state, or a new RRC state. In the idle state, the UE and base station may or may not save context information; in the inactive state and the new RRC state, both the UE and base station save context information.

[0050] In this embodiment of the disclosure, after the contention is resolved, the base station and the UE activate the security of the radio access network (AS) layer through the established dedicated radio signaling bearer (SRBx). After the AS layer security is activated, the network side and the UE transmit UE service data through SRBx.

[0051] In one exemplary embodiment, after the UE transmits data via a dedicated signaling radio bearer, the process further includes the UE entering a second state corresponding to the first state, wherein the second state does not support data transmission.

[0052] In this embodiment of the disclosure, after the first service transmission is completed, that is, after the data transmission is completed, the UE enters the second state. When the UE initiates the data transmission service again, the UE enters the first state from the second state to perform data transmission, thereby achieving the switching between performing data transmission and not performing data transmission. When not performing data transmission, power saving can be achieved.

[0053] In one exemplary embodiment, in response to the UE re-initiating a data transmission service in the second state, the method further includes: the UE entering the first state, and, with the UE saving the context information, the UE resuming the dedicated signaling radio bearer and performing radio access network security activation, and simultaneously sending a data transmission request and at least part of the data to be transmitted to the base station through the dedicated signaling radio bearer.

[0054] In this embodiment of the disclosure, the context information includes context information for dedicated signaling radio bearers and radio access network security activation.

[0055] In one exemplary embodiment, in response to the UE re-initiating a data transmission service in the second state, the method further includes: the UE entering a first state, and, if the UE has not saved context information, the UE establishing a dedicated signaling radio bearer based on the data transmission request and performing activation of radio access network security to send the data to be transmitted to the base station through the dedicated signaling radio bearer.

[0056] The above steps provide a data transmission method in which the UE sends a data transmission request to the base station, the request carrying the UE ID and a service initiation or registration request; the UE receives a contention resolution identifier from the base station and transmits data via a dedicated signaling radio bearer. This solves the problem of complex data transmission processes in communication networks in related technologies, achieving the effects of reducing the complexity of data transmission processes in communication networks and improving data transmission efficiency.

[0057] This disclosure also provides a data transmission method, executed by a base station. Figure 3 is another flowchart of the data transmission method according to an embodiment of this disclosure. As shown in Figure 3, the process includes the following steps:

[0058] In step S302, the base station receives a data transmission request from the UE, which carries the UE ID and a service initiation or service registration request.

[0059] In this embodiment of the disclosure, the data transmission request received by the base station from the UE can be a data transmission request corresponding to a small data transmission. The data transmission request (CFT Request) is a newly defined RRC message. Since it does not need to carry the RRC connection establishment request message, the CFT Request carries the UE ID and the traditional initiation request message. The traditional initiation request includes a service initiation or service registration request.

[0060] In one exemplary embodiment, the data transmission request is further used to establish a dedicated signaling radio bearer, which uses a default-configured packet data convergence protocol, radio link control protocol, or media access control protocol.

[0061] In this embodiment of the disclosure, the aforementioned dedicated signaling radio bearer is also used to carry out subsequent processes such as secure establishment between the base station and the UE.

[0062] In one exemplary embodiment, before the base station receives a data transmission request from the UE, the method further includes: the base station sending a paging instruction to the UE, the paging instruction carrying a first field, the first field being used to instruct the UE to perform data transmission.

[0063] In this embodiment of the disclosure, CFT supports both UE-triggered and network-triggered transmission. When downlink data arrives, the network informs the UE to initiate connectionless transmission through paging. A new field, the first field, is added to the paging to distinguish whether it is a connectionless transmission or a traditional RRC connection establishment.

[0064] In step S304, the base station sends a contention resolution identifier to the UE and transmits data through a dedicated signaling radio bearer.

[0065] In one exemplary embodiment, data transmission via a dedicated signaling radio bearer includes: a base station receiving transmission data from a UE via the dedicated signaling radio bearer and sending the transmission data to the core network.

[0066] In this embodiment of the disclosure, after receiving the dedicated signaling radio bearer SRBx, the base station will further forward the data carried by the SRBx to the core network.

[0067] In one exemplary embodiment, the base station transmits data to the core network, including: the base station transmits the data to the Access Mobility Function (AMF), forwards it via the AMF to the Session Management Function (SMF), and forwards it via the SMF to the User Plane Function (UPF).

[0068] In one exemplary embodiment, the base station transmits data to the core network, including: the base station transmits the data to the UPF.

[0069] Through the above description of the embodiments, those skilled in the art can clearly understand that the methods according to the above embodiments can be implemented by means of software plus necessary general-purpose hardware platforms. Of course, they can also be implemented by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of this disclosure, in essence, or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk), and includes several instructions to cause a terminal device (which may be a mobile phone, computer, server, or network device, etc.) to execute the methods described in the various embodiments of this disclosure.

[0070] This embodiment also provides a data transmission device for implementing the above embodiments and preferred embodiments; details already described will not be repeated. As used below, the term "module" can refer to a combination of software and / or hardware that performs a predetermined function. Although the device described in the following embodiments is preferably implemented in software, hardware implementation, or a combination of software and hardware, is also possible and contemplated.

[0071] The data transmission apparatus provided in this embodiment can be installed in a UE and includes a transmitting module and a first transmission module. The transmitting module is configured to send a data transmission request to a base station, the data transmission request carrying a UE ID and a service initiation or service registration request. The first transmission module is configured to receive a contention resolution identifier from the base station and perform data transmission via a dedicated signaling radio bearer.

[0072] The data transmission apparatus provided in this embodiment can be located in a base station and includes a receiving module and a second transmitting module. The receiving module is configured to receive data transmission requests from a UE, the data transmission requests carrying a UE ID and a service initiation or service registration request. The second transmitting module is configured to send a contention resolution identifier to the UE and perform data transmission via a dedicated signaling radio bearer.

[0073] In this embodiment of the disclosure, the data transmission device may further include different modules, and the naming and functional division of the modules may be selected in different ways according to the actual situation, without specific limitations.

[0074] It should be noted that the above modules can be implemented by software or hardware. For the latter, they can be implemented in the following ways, but are not limited to: all the above modules are located in the same processor; or, the above modules are located in different processors in any combination.

[0075] Embodiments of this disclosure also provide a computer-readable storage medium storing a computer program configured to perform the steps in any of the above method embodiments when executed.

[0076] In one exemplary embodiment, the aforementioned computer-readable storage medium may include, but is not limited to, various media capable of storing computer programs, such as a USB flash drive, read-only memory (ROM), random access memory (RAM), portable hard disk, magnetic disk, or optical disk.

[0077] Embodiments of this disclosure also provide an electronic device including a memory and a processor, the memory storing a computer program and the processor being configured to run the computer program to perform the steps in any of the above method embodiments.

[0078] In one exemplary embodiment, the electronic device may further include a transmission device and an input / output device, wherein the transmission device is connected to the processor and the input / output device is connected to the processor.

[0079] This disclosure also provides a computer program product, including a computer program that, when executed by a processor, implements the steps in any of the above method embodiments.

[0080] In one exemplary embodiment, the computer program product described above includes a non-volatile computer-readable storage medium storing a computer program that, when executed by a processor, implements the steps of the methods described in various embodiments of this disclosure.

[0081] Specific examples in this embodiment can be found in the examples described in the above embodiments and exemplary implementations, and will not be repeated here.

[0082] It is obvious to those skilled in the art that the modules or steps of this disclosure described above can be implemented using general-purpose computing devices. They can be centralized on a single computing device or distributed across a network of multiple computing devices. They can be implemented using computer-executable program code, and thus can be stored in a storage device for execution by a computing device. In some cases, the steps shown or described can be performed in a different order than those presented herein, or they can be fabricated as separate integrated circuit modules, or multiple modules or steps can be fabricated as a single integrated circuit module. Thus, this disclosure is not limited to any particular combination of hardware and software.

[0083] To enable those skilled in the art to better understand the technical solutions disclosed herein, the following description is provided in conjunction with different embodiments.

[0084] Example 1

[0085] Since IoT terminals send relatively small amounts of data and the duration of data transmission is also relatively short, the data service initiation process required for IoT terminals to transmit data should be streamlined as much as possible.

[0086] Figure 4 is a flowchart illustrating the data transmission method initiated by the UE for the first data transmission service according to an embodiment of this disclosure. As shown in Figure 4, the process for small data transmission includes the following steps:

[0087] S1, CFT process initiated.

[0088] CFT stands for Connection Free Transmission.

[0089] S2, UE Random Access (RA) Initiation Procedure (msg1).

[0090] After receiving the SIB message sent by the network side and obtaining resource information, the UE uses the RA resource unique to CFT configured in the SIB to send a random access request to the base station.

[0091] S3, RA authorization (msg2).

[0092] The network side (base station) identifies the user as a CFT user through the specific RA resource in msg1. The base station replies to the UE with msg2 and allocates a larger transport block size (TB size) through the uplink grant (UL grant) in msg2. The grant size can accommodate the request. In msg2, the base station allocates a temporary radio network identifier scrambled temp C-RNTI to the UE. Here, temp C-RNTI is the first temp C-RNTI in the above embodiment.

[0093] S4, CFT Request.

[0094] In this embodiment of the disclosure, the CFT Request is the data transmission request in the above embodiments.

[0095] In this embodiment, the CFT Request, or data transmission request, is a newly defined RRC message. Since it does not need to carry an RRC connection establishment request message, the CFT Request carries the UE ID and a traditional initiation request message, uses first temp C-RNTI scrambling, employs transparent TM mode for Radio Link Control (RLC), and uses SRB0 for transmission. The traditional initiation request includes a service initiation request or a service registration request.

[0096] In one embodiment, the CFT Request not only sends the UE ID and a conventional initiation request, but also establishes a CFT-specific SRBx connection by default.

[0097] In this embodiment of the disclosure, the dedicated signaling radio bearer SRBx of the CFT is used to carry out processes such as secure establishment between the subsequent Radio Access Node (RAN) and the UE.

[0098] In this embodiment of the disclosure, compared to the conventional initiation process, the initiation request is sent from msg5 to msg3, thereby reducing the number of signaling messages.

[0099] S5, the competition resolution process.

[0100] The network side uses MAC CE to send the contention resolution result. This contention resolution result can be sent using the traditional UE Contention Resolution Identity MAC CE, scrambled with temp C-RNTI. After a successful contention, temp C-RNTI becomes C-RNTI, and subsequent air interfaces use this C-RNTI for scrambling. Here, temp C-RNTI is the second temp C-RNTI in the above embodiment, and C-RNTI is the second C-RNTI in the above embodiment.

[0101] S10. After the contention is resolved, the network side and the UE activate the security of the Access Stratum (AS) layer through the established default SRBx.

[0102] After AS layer security activation is completed, the network side and UE transmit UE service data through SRBx. In this embodiment, SRBx is defined as a special type of SRB. After receiving SRBx, the base station will further forward the data carried by SRBx to the core network.

[0103] It should be noted that, in this embodiment, as shown in Figure 4, steps S6 to S9 are omitted. Steps S6 to S9 are standard steps.

[0104] Figure 5 is a flowchart illustrating the process of SRBx sending data to the core network according to an embodiment of this disclosure. As shown in Figure 5, SRBx is further delivered to AMF, then forwarded by AMF to SMF, and then forwarded by SMF to UPF.

[0105] Figure 6 is another flowchart illustrating the process of SRBx sending data to the core network according to an embodiment of this disclosure. As shown in Figure 6, the data carried by SRBx can be directly delivered by the base station to the UPF, and the UPF parses the data packet to obtain the UE's data.

[0106] In this embodiment, since no air interface connection is established, the UE does not need to send an RRC setup request signaling, and the base station does not need to reply with an RRC setup message, thus reducing the number of signaling messages. After the UE's capabilities and security are established, following the conventional procedure, the base station sends an RRC reconfiguration message to the UE and establishes the relevant parameters of the DRB through the RRC reconfiguration message (some parameters use default values), thus simplifying the configuration.

[0107] In this embodiment of the disclosure, CFT supports both UE-triggered and network-triggered transmission. When downlink data arrives, the network informs the UE to initiate connectionless transmission through paging. A new field, the first field, is added to the paging to distinguish whether it is a connectionless transmission or a traditional RRC connection establishment.

[0108] It should be noted that the data transmission method provided in this disclosure is not only applicable to CFT small data transmission, but can also be used in conventional random access procedures.

[0109] Example 2

[0110] In this embodiment, the scenario where the UE initiates data transmission service again is described.

[0111] Figure 7 is a flowchart illustrating the data transmission method initiated by the UE for a second data transmission service according to an embodiment of this disclosure. As shown in Figure 7, the process for small data transmission includes the following steps:

[0112] S1, CFT process initiated.

[0113] CFT stands for Connection Free Transmission.

[0114] S2, UE Random Access (RA) Initiation Procedure (msg1).

[0115] After receiving the SIB message sent by the network side and obtaining resource information, the UE uses the RA resource unique to CFT configured in the SIB to send a random access request to the base station.

[0116] S3, RA authorization (msg2).

[0117] The network side (base station) identifies the user as a CFT user through the specific RA resource in msg1. The base station replies to the UE with msg2 and allocates a larger transport block size (TB size) through the uplink grant (UL grant) in msg2. The grant size can accommodate the request. In msg2, the base station allocates a temporary radio network identifier scrambled temp C-RNTI to the UE. Here, temp C-RNTI is the first temp C-RNTI in the above embodiment.

[0118] S4. Data transmission for data transmission services that are carried out again through a dedicated signaling radio bearer based on the state of the UE's data transmission.

[0119] The RRC state (i.e., the first state in the above embodiments) in which the UE transmits data can be in an idle state, an inactive state, or a new RRC state. Before the UE initiates a data transmission request for the first time, the UE is in an idle state:

[0120] In one embodiment, in response to the UE's RRC state being idle during data transmission, after contention resolution is completed and both the UE and the network side establish a dedicated signaling radio bearer for data transmission, the UE state becomes idle-ready-to-transmit data state. After the UE finishes transmitting data, the UE transitions from the idle-ready-to-transmit data state to the idle state.

[0121] In one embodiment, in response to the UE being in an inactive RRC state during data transmission, after contention resolution is completed and both the UE and the network side have established a dedicated signaling radio bearer for data transmission, the UE state becomes inactive-ready-to-transmit data state. After the UE finishes transmitting data, the UE transitions from the inactive-ready-to-transmit data state to the inactive state.

[0122] In this embodiment of the disclosure, when the UE enters an inactive state, the UE restores the dedicated signaling radio bearer and performs radio access network security activation, simultaneously sending a data transmission request and the data to be transmitted to the base station through the dedicated signaling radio bearer. As shown in Figure 7, the UE simultaneously sends a data transmission request (CFT Request) and transmitted data (UL data).

[0123] In one embodiment, in response to the UE's data transmission being in a new RRC state, after contention resolution is completed and both the UE and the network side have established a dedicated signaling radio bearer for data transmission, the UE state becomes the new RRC_transmittable data state. After the UE finishes transmitting data, the UE transitions from the inactive_transmittable data state to the new RRC state.

[0124] In this embodiment of the disclosure, when the UE enters a new RRC state, the UE restores the dedicated signaling radio bearer and performs radio access network security activation, simultaneously sending a data transmission request and the data to be transmitted to the base station through the dedicated signaling radio bearer. As shown in Figure 7, the UE simultaneously sends a data transmission request (CFT Request) and transmitted data (UL data).

[0125] In one embodiment, if the UE supports saving its context information after data transmission, then upon the next service initiation, the saved context information is directly used to restore the established dedicated signaling radio bearer and perform AS activation security. If the UE does not support saving its context information after data transmission, then upon the next service initiation, the UE needs to re-establish the dedicated signaling radio bearer.

[0126] In this embodiment of the disclosure, the idle_data-transmittable state allows the UE to save or not save context information after data transmission ends; the inactive_data-transmittable state allows the UE to save context information after data transmission ends; and the new RRC state_data-transmittable state allows the UE to save context information after data transmission ends.

[0127] In this embodiment of the disclosure, after the UE data transmission is completed, if both the network side and the UE support saving the UE context information, the UE context information includes at least the context information of the dedicated signaling radio bearer and the radio access network security activation. When the UE needs to initiate service transmission again, the UE restores the dedicated signaling radio bearer and performs radio access network security activation through the saved context, and simultaneously sends a data transmission request and the data to be transmitted to the base station through the dedicated signaling radio bearer. As shown in Figure 7, the UE simultaneously sends a data transmission request (CFT Request) and transmitted data (UL data).

[0128] S5. The base station sends a Contention Resolution Identifier (MAC CE) to the UE.

[0129] As shown in Figure 7, because the UE sent a data transmission request (CFT Request) to the base station in S4, the base station will also send a contention resolution identifier (MAC CE) to the UE in S5. Unlike when the UE initiates a data transmission service again corresponding to the UE state, this is not the first time the base station has sent the MAC CE to the UE.

[0130] As shown in Figure 7, after S5, the transmission process of uplink and downlink data is also involved. Because there is a lot of data transmission between the UE and the base station, although the UE sends a data transmission request (CFT Request) and transmission data (UL data) to the base station at the same time in S4, it cannot send all the transmission data through S4. Therefore, data transmission needs to continue in the following steps.

[0131] It should be noted that msg1, msg2, ... msg5 in the embodiments of this disclosure are message representations commonly used in the field of communication, and their specific contents will not be described in detail here.

[0132] In summary, this disclosure provides a data transmission method that, compared to SDT, simplifies the initial service initiation process for the UE: by receiving the SIB, receiving the Radio Resource Control Reconfiguration (RRC Reconfiguration) message, sending the CFT Request, activating AS security, and receiving the RRC Reconfiguration message, small data packets can be transmitted, and the service initiation process can be resumed using only the CFT Request.

[0133] In this embodiment, the CFT registration and initiation process differs from the conventional process in the following ways: First, the CFT registration / initiation process may not establish an RRC connection (SRB1), thus eliminating the need to transmit RRC Setup Request, RRC Setup, or RRC Setup Complete signaling, thereby simplifying it to CFT Request or MAC CE. In this embodiment, the CFT Request, as a new type of RRC signaling, directly carries the registration request or service request and the UE ID, and establishes a dedicated control plane connection for CFT by default. Second, it is not necessary to release and store SDT-specific data through the RRC connection. Third, data is transmitted using SRBx, eliminating the need to configure DRB bearer transmission via RRC Reconfiguration.

[0134] The above description is merely a preferred embodiment of this disclosure and is not intended to limit this disclosure. Various modifications and variations can be made to this disclosure by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the principles of this disclosure should be included within the scope of protection of this disclosure.

Claims

1. A data transmission method, comprising: The user equipment (UE) sends a data transmission request to the base station. The data transmission request carries the user identifier (UE ID) and a service initiation or service registration request. The UE receives a contention resolution identifier from the base station and transmits data via a dedicated signaling radio bearer.

2. The method according to claim 1, wherein, The data transmission request is also used to establish the dedicated signaling radio bearer, which uses a default-configured packet data aggregation protocol, radio link control protocol, or media access control protocol.

3. The method according to claim 1, wherein, The data transmission request is scrambled using a first temporary radio network identifier, and the radio link control corresponding to the data transmission request uses transparent TM mode.

4. The method of claim 3, wherein, Before the UE sends a data transmission request to the base station, the method further includes: The UE sends a random access request to the base station based on the random access resources dedicated to data transmission; The UE receives a random access response from the base station, the random access response carrying the first temporary radio network identifier.

5. The method of claim 1, wherein, The UE receives a contention resolution identifier from the base station, including: The UE receives the contention resolution identifier from the base station via the Media Access Control Element (MAC CE).

6. The method according to claim 5, wherein, The contention resolution identifier is scrambled with a second temporary radio network identifier. After the UE successfully competes, the second temporary radio network identifier is converted to a second radio network identifier.

7. The method of claim 5, wherein, After the UE receives the contention resolution identifier from the base station, the method further includes: The terminal is determined to have entered a first state, wherein the first state supports data transmission.

8. The method of claim 7, wherein, The UE transmits data via a dedicated signaling radio bearer, including: In response to the UE initiating a data transmission service, the UE establishes the dedicated signaling radio bearer, activates radio access network security, and transmits data through the dedicated signaling radio bearer.

9. The method of claim 8, wherein, After the UE transmits data via the dedicated signaling radio bearer, the method further includes: The UE enters a second state corresponding to the first state, wherein the second state does not support data transmission.

10. The method of claim 9, wherein, In response to the UE re-initiating a data transmission service in the second state, the method further includes: When the UE enters the first state, and with the UE having saved the context information, the UE restores the dedicated signaling radio bearer and performs radio access network security activation, and simultaneously sends the data transmission request and at least part of the data to be transmitted to the base station through the dedicated signaling radio bearer.

11. The method of claim 9, wherein, In response to the UE re-initiating a data transmission service in the second state, the method further includes: The UE enters the first state, and if the UE has not saved the context information, the UE establishes the dedicated signaling radio bearer based on the data transmission request and performs activation of radio access network security to send the data to be transmitted to the base station through the dedicated signaling radio bearer.

12. A data transmission method, comprising: The base station receives a data transmission request from a user equipment (UE), the data transmission request carrying a user identifier (UE ID) and a service initiation or service registration request; The base station sends a contention resolution identifier to the UE and transmits data via a dedicated signaling radio bearer.

13. The method according to claim 12, wherein, The data transmission request is also used to establish the dedicated signaling radio bearer, which uses a default-configured packet data aggregation protocol, radio link control protocol, or media access control protocol.

14. The method of claim 12, wherein, Before the base station receives a data transmission request from the user equipment (UE), the method further includes: The base station sends a paging command to the UE, the paging command carrying a first field, the first field being used to instruct the UE to perform data transmission.

15. The method of claim 12, wherein, The data transmission via dedicated signaling radio bearer includes: The base station receives transmission data from the UE through the dedicated signaling radio bearer and sends the transmission data to the core network.

16. The method of claim 15, wherein, The base station sends the transmitted data to the core network, including: The base station sends the transmitted data to the Access Mobility Function (AMF), which then forwards it to the Session Management Function (SMF), and finally the User Plane Function (UPF).

17. The method of claim 15, wherein, The base station sends the transmitted data to the core network, including: The base station sends the transmitted data to the UPF.

18. A computer readable storage medium having stored therein a computer program, wherein, When the computer program is executed by a processor, it implements the steps of the method described in any one of claims 1 to 11, or the steps of the method described in any one of claims 12 to 17.

19. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor, when executing the computer program, implements the steps of the method according to any one of claims 1 to 11, or implements the steps of the method according to any one of claims 12 to 17.

20. A computer program product comprising a computer program that, when executed by a processor, implements the steps of the method according to any one of claims 1 to 11, or implements the steps of the method according to any one of claims 12 to 17.

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