CN113497685A

CN113497685A - Data transmission method and related product

Info

Publication number: CN113497685A
Application number: CN202010191718.9A
Authority: CN
Inventors: 夏欣
Original assignee: Shenzhen Transsion Holdings Co Ltd
Current assignee: Shenzhen Transsion Holdings Co Ltd
Priority date: 2020-03-18
Filing date: 2020-03-18
Publication date: 2021-10-12
Also published as: WO2021184417A1; CN115298993A

Abstract

The embodiment of the application discloses a data transmission method and a related product. The method comprises the following steps: under the condition that a terminal is in an inactive state and/or has data to be transmitted, if the terminal meets a first condition, the terminal transmits the data by using uplink resources configured by a base station, wherein the first condition is that the base station configures the uplink resources in the inactive state for the terminal. The embodiment of the application also discloses a data transmission method in various non-activated states. In the embodiment of the application, aiming at the technical characteristics and the data transmission characteristics of the terminal in the non-activated state, the terminal selects different non-activated state methods to transmit data in different scenes, so that the signaling burden of transmission is greatly reduced, and the transmission efficiency is improved.

Description

Data transmission method and related product

Technical Field

The present application relates to the field of communications technologies, and in particular, to a data transmission method and a related product.

Background

Aiming at a terminal (User Equipment, UE) needing periodic or irregular data transmission, the 5G system newly introduces an Inactive State/Inactive State (Inactive State) of the terminal, so that compared with the original idle State to a connected State, the State transition time from the Inactive State to the connected State is greatly reduced, signaling burden on an air interface and a network interface can be reduced, and the terminal can simultaneously reduce the time delay of terminal access under the condition of keeping power consumption similar to that of the idle State. However, if the terminal intends to transmit data in the inactive state, it still needs to enter the connected state through Radio Resource Control (RRC) signaling and then transmit the data, which results in a large signaling burden and low data transmission efficiency for some frequent periodic or aperiodic data transmission, especially for transmission with small data amount.

In terms of reducing the signaling burden of data transmission and improving the data transmission efficiency, the existing research provides a plurality of possible schemes, such as a two-step random access scheme, a four-step random access scheme, and the like. However, there is no effective countermeasure on how to select a transmission scheme, that is, how to select when and under what conditions the terminal should select.

Disclosure of Invention

The embodiment of the application discloses a data transmission method and a related product. In the method, aiming at the technical characteristics and the data transmission characteristics of the terminal in the non-activated state, the terminal selects different non-activated state methods to transmit data in different scenes, so that the signaling burden of transmission is greatly reduced, and the transmission efficiency is improved.

In a first aspect, an embodiment of the present application provides a data transmission method, where the method includes:

under the condition that a terminal is in an inactive state and/or has data to be transmitted, if the terminal meets a first condition, the terminal transmits the data by using uplink resources configured by a base station, wherein the first condition is that the base station configures the uplink resources in the inactive state for the terminal.

In an alternative implementation, the first condition includes:

and the base station configures the uplink resource in an inactive state for the terminal, and the uplink timing advance configuration of the terminal is currently in an effective state.

In this implementation manner, the uplink resource configured by the base station for the terminal is a resource configured by the base station in the configuration uplink grant type one, the uplink timing advance configuration of the terminal is currently in an effective state, that is, the uplink timing advance timer of the terminal is not overtime, and the terminal is in an uplink synchronization state. The first condition may include that the current service type of the terminal belongs to a service type set configured by the base station, where the service type may be obtained by a service parameter transmitted by an Access Stratum (AS) of the terminal through a non-access stratum (NAS), may also be determined by the terminal according to a quality of service class identifier (QoS class identifier, QCI) attribute of the data service, and may also be implemented depending on the terminal, in addition to the configured uplink resource and the valid state of the terminal. The terminal transmits data by adopting the uplink resources configured by the base station, so that unnecessary system signaling burden can be reduced, and transmission efficiency is improved. In an optional implementation manner, after the terminal transmits data by using the uplink resource configured by the base station, the method further includes:

and under the condition that data needs to be transmitted after the uplink resources are completely consumed, the terminal selects an inactive method to transmit the data.

In the implementation mode, after the terminal consumes the uplink resources, the terminal selects the method in the inactive state to transmit data, so that the signaling burden can be reduced to the maximum extent, and the transmission efficiency is improved.

In an optional implementation, the method further includes:

and under the condition that the terminal is in an inactive state and/or has data to be transmitted, if the terminal does not meet the first condition, the terminal selects the method in the inactive state to transmit the data.

In this implementation manner, if the base station does not configure the uplink resource for the terminal or the uplink timing advance configuration of the terminal is not currently in an active state, the terminal selects the method in the inactive state to transmit data.

In an optional implementation manner, the selecting, by the terminal, the inactive method for transmitting data includes:

and the terminal transmits data by adopting two-step random access or four-step random access in an inactive state.

In this implementation, there are many possible schemes for the method in the inactive state to transmit data, such as a two-step random access scheme, a four-step random access scheme, and so on, and different transmission methods may be selected in different application scenarios.

In an optional implementation manner, the transmitting, by the terminal, data by using two-step random access or four-step random access in an inactive state includes:

and under the condition that the base station supports the terminal to adopt the two-step random access in the non-activated state, if the terminal meets a second condition, the terminal adopts the two-step random access in the non-activated state to transmit data.

In this implementation, the second condition includes one or more conditions, the terminal needs to satisfy the condition that the base station supports the terminal to adopt two-step random access, and the terminal needs to satisfy at least any one of the second conditions, or may satisfy multiple combination conditions of the second conditions, and in the case of the above-mentioned condition, the terminal selects to adopt two-step random access to transmit data.

and if the terminal meets a third condition, the terminal transmits data by adopting four-step random access in the inactive state under the condition that the base station does not support the two-step random access in the inactive state of the terminal or the terminal does not meet the second condition.

In an optional implementation manner, the third condition is that the base station supports the terminal to transmit data by using a four-step random access in an inactive state.

In an alternative implementation, the second condition includes at least one of:

the current signal strength of the terminal is higher than the target signal threshold, the data volume required to be transmitted by the terminal currently is smaller than or equal to the first target data volume threshold, the data volume required to be transmitted by the terminal within the target time is smaller than or equal to the second target data volume threshold, the data service type required to be transmitted by the terminal currently belongs to the service type set configured by the base station, the data service type required to be transmitted by the terminal currently does not belong to the service type set configured by the base station, and the random number selected by the terminal is smaller than or equal to the third target threshold.

In this implementation, the third condition is that the base station supports the terminal to transmit data by using four-step random access, and the terminal may transmit data by using four-step random access when the third condition is satisfied, where the third condition may further include one or more other combination conditions, such as that the current signal strength of the terminal is higher than a target signal threshold, the current data amount that the terminal needs to send is less than or equal to a certain target data amount threshold, and the like, and both the target signal threshold and the target data amount threshold may be transmitted to the terminal through a broadcast message and/or an RRC signaling.

In an optional implementation, the method further includes:

and under the condition that the terminal does not meet the fourth condition, the terminal enters a connection state to transmit data.

In an optional implementation manner, the fourth condition is that the base station supports the terminal to adopt at least one of two-step random access and four-step random access in an inactive state.

In an optional implementation, the method further includes:

and under the condition that the terminal does not meet the second condition and the third condition, the terminal enters a connected state to transmit data.

In an alternative implementation, the first condition includes at least one of:

the current service type of the terminal belongs to the service type set configured by the base station;

the current service type of the terminal does not belong to the service type set configured by the base station.

In an alternative implementation, the third condition includes at least one of:

the current signal strength of the terminal is higher than the target signal threshold, the data volume required to be transmitted by the terminal currently is smaller than or equal to the first target data volume threshold, the data volume transmitted by the terminal within the target time is smaller than or equal to the second target data volume threshold, the data service type required to be transmitted by the terminal currently belongs to the service type set configured by the base station, the data service type required to be transmitted by the terminal currently does not belong to the service type set configured by the base station, and the random number selected by the terminal is smaller than or equal to the third target threshold.

In an optional implementation, the method further includes:

and under the condition that the terminal does not meet the fourth condition and the fifth condition, the terminal enters a connected state to transmit data.

In an alternative implementation, the fifth condition includes at least one of:

the data volume required to be transmitted by the terminal currently is smaller than or equal to a first target data volume threshold, the data volume transmitted by the terminal within a target time is smaller than or equal to a second target data volume threshold, the data service type required to be transmitted by the terminal currently belongs to a service type set configured by the base station, and the data service type required to be transmitted by the terminal currently does not belong to the service type set configured by the base station.

In an optional implementation manner, at least one of the target signal threshold, the first target data amount threshold, the second target data amount threshold, the third target threshold, and the set of traffic types configured by the base station is transmitted to the terminal through a broadcast message and/or radio resource management layer RRC signaling.

In the embodiment of the application, aiming at the technical characteristics and the data transmission characteristics of the terminal in the non-activated state, the terminal selects different non-activated state methods to transmit data in different scenes, so that the signaling burden of transmission is greatly reduced, and the transmission efficiency is improved.

In a second aspect, an embodiment of the present application provides a data transmission apparatus, including:

a transmission unit, configured to transmit data using uplink resources configured by a base station if a terminal is in an inactive state and/or has data to transmit, where the terminal meets a first condition that the base station configures the uplink resources in the inactive state for the terminal.

In an optional implementation, the apparatus further comprises:

and the selection unit is used for selecting the method in the inactive state to transmit the data under the condition that the data needs to be transmitted after the uplink resources are completely consumed.

In an optional implementation manner, the selecting unit is further configured to select the method in the inactive state to transmit the data if the terminal does not satisfy the first condition under the condition that the terminal is in the inactive state and/or has data to transmit.

In an optional implementation manner, the selecting unit is specifically configured to transmit data by using two-step random access or four-step random access in an inactive state.

In an optional implementation manner, the selecting unit is specifically configured to, when the base station supports the terminal to employ the two-step random access in the inactive state, if the terminal satisfies a second condition, employ the two-step random access in the inactive state to transmit data; the second condition includes at least one of: the current signal intensity of the terminal is higher than a target signal threshold, the data volume required to be transmitted by the terminal currently is smaller than or equal to a first target data volume threshold, the data volume transmitted by the terminal within a target time is smaller than or equal to a second target data volume threshold, the data service type required to be transmitted by the terminal currently belongs to a service type set configured by the base station, the data service type required to be transmitted by the terminal currently does not belong to the service type set configured by the base station, and the random number selected by the terminal is smaller than or equal to a third target threshold.

In an optional implementation manner, the selecting unit is further specifically configured to transmit data by using four-step random access in an inactive state if the terminal satisfies a third condition when the base station does not support the terminal to use two-step random access in the inactive state or the terminal does not satisfy the second condition, where the third condition is that the base station supports the terminal to use four-step random access in the inactive state to transmit data; the second condition includes at least one of: the current signal strength of the terminal is higher than the target signal threshold, and/or the data volume required to be transmitted by the terminal currently is smaller than or equal to the first target data volume threshold, the data volume transmitted by the terminal within the target time is smaller than or equal to the second target data volume threshold, the data service type required to be transmitted by the terminal currently belongs to the service type set configured by the base station, the data service type required to be transmitted by the terminal currently does not belong to the service type set configured by the base station, and the random number selected by the terminal is smaller than or equal to the third target threshold.

In an optional implementation manner, the selecting unit is specifically further configured to select to enter a connection state for data transmission when the terminal does not meet a fourth condition, where the fourth condition is that the base station supports the terminal to use at least one of two-step random access and four-step random access in an inactive state.

In an optional implementation manner, the selecting unit is specifically further configured to select to enter a connection state to transmit data when the terminal does not satisfy the second condition and the third condition.

In an optional implementation manner, the selecting unit is specifically further configured to select to enter a connection state for transmitting data when the terminal does not satisfy the fourth condition and does not satisfy the fifth condition.

In a third aspect, an embodiment of the present application provides a data transmission device, including a processor and a memory; the processor is configured to support the data transmission device to perform corresponding functions in the methods of the first aspect and the optional implementations of the first aspect. The memory stores programs (instructions) and data necessary for the data transfer device. Optionally, the data transmission device may further include an input/output interface for supporting communication between the data transmission device and other devices.

In a fourth aspect, embodiments of the present application provide a computer-readable storage medium, which stores one or more instructions adapted to be loaded by the processor and execute the method according to the first aspect and the implementation manner in the first aspect.

In a fifth aspect, embodiments of the present application provide a computer program product containing instructions, which when run on a computer, cause the computer to perform the method of the first aspect and any optional implementation manner thereof.

According to the technical characteristics and the data transmission characteristics of the terminal in the non-activated state, the terminal selects different non-activated state methods to transmit data in different scenes, so that the mobility management complexity and the signaling burden of the terminal and the signaling burden of data transmission are reduced to a certain extent, and the transmission efficiency is improved.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments or the background art of the present application, the drawings required to be used in the embodiments or the background art of the present application will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

Fig. 1a is a schematic diagram of a state transition process of a terminal;

fig. 1b is a schematic flow chart of the terminal entering a connected state from an inactive state;

fig. 2a is a schematic diagram of a four-step random access process based on a control plane scheme;

fig. 2b is a schematic diagram of a four-step random access process based on a user plane scheme;

FIG. 2c is a diagram illustrating a two-step random access process based on contention access;

fig. 3 is a schematic flowchart of a data transmission method according to an embodiment of the present application;

fig. 4 is a schematic flowchart of another data transmission method according to an embodiment of the present application;

fig. 5a is a schematic flowchart of another data transmission method according to an embodiment of the present application;

fig. 5b is a schematic flowchart of another data transmission method according to an embodiment of the present application;

fig. 6 is a schematic flowchart of another data transmission method according to an embodiment of the present application;

fig. 7 is a schematic structural diagram of a data transmission device according to an embodiment of the present application;

fig. 8 is a schematic structural diagram of a terminal according to an embodiment of the present application.

Detailed Description

In order to make the embodiments of the present application better understood, the technical solutions in the embodiments of the present application will be clearly described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only some embodiments of the present application, but not all embodiments.

The terms "first," "second," and "third," etc. in the description embodiments and claims of the present application and the above-described drawings are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. The terms "comprises" and "comprising," and any variations thereof, in the description examples and claims of this application, are intended to cover a non-exclusive inclusion, such as, for example, a list of steps or elements. A method, system, article, or apparatus is not necessarily limited to those steps or elements explicitly listed, but may include other steps or elements not explicitly listed or inherent to such process, system, article, or apparatus.

Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.

In order to more clearly describe the scheme of the present application, the following description is made on the embodiments of the present application with reference to the drawings.

Referring to fig. 1a, fig. 1a is a schematic diagram illustrating a state transition process of a terminal. As shown in fig. 1a, the 5G system newly refers to the inactive state of the UE for a user terminal that transmits a small amount of data periodically or aperiodically. The main characteristics of the inactive state include that UE context information is stored in a Radio Access Network (RAN) side, and specifically, the UE context information stores Radio configuration of the UE and core Network information of the 5GC, thereby allowing state transition of the UE between the inactive state and the connected state to be realized without core Network intervention; the main features of the inactive state also include UE autonomous mobility, such as cell selection, cell reselection procedure in the inactive state; the main features of the inactive state also include the state between the inactive state and the connected state, mobility management, and the UE being in the inactive state, all transparent to the core network. In addition, fig. 1 also shows a general process of UE state transition, in which the UE first initiates a Radio Resource Control (RRC) request in an idle state, so as to enter a connected state to transmit data, and after the data transmission is completed, the RRC connection request is released, and the UE returns to the idle state. Another alternative is that the UE initiates an RRC connection request in an inactive state to enter a connected state for data transmission, and then delays to release the RRC connection request to return to the inactive state, and if the inactive state rejects the delayed RRC connection request, returns to the idle state by releasing the RRC connection request. Compared with the prior art, the method has the advantages that the state transition time from the inactive state to the connected state is greatly shortened, the signaling burden on an air interface and a network interface can be reduced, the UE maintains the power consumption similar to that of the idle state, the UE access delay is reduced, and the transmission efficiency is improved.

Specifically, the process of the UE entering the connected state in the inactive state to transmit data may refer to fig. 1b, where fig. 1b is a schematic diagram of the process of the terminal entering the connected state from the inactive state. As shown in fig. 1b, when the terminal is in an inactive state, it needs to obtain the I-RNTI allocated by the previous serving base station gNB, so an RRC connection request is initiated to the current gNB, and if the current gNB can resolve the gNB identifier included in the I-RNTI, it will request the previous serving gNB to provide UE context data, and then the previous serving gNB provides specific information of the UE context data, until the current gNB and the UE have completed the RRC connection recovery. However, if it is desired to prevent the user data in the previous serving gNB from being lost, the current gNB needs to provide a forwarding address, specifically, the current gNB may send a path switching request to an Access Management Function (AMF), after receiving a path switching request reply from the AMF, the gNB performs path switching, and after the path switching is completed, the gNB triggers the release of the UE resource when the previous serving gNB is used.

The four-step random access data transmission in the invention refers to a method for directly transmitting data based on a four-step random access process. Referring to fig. 2a, fig. 2a is a diagram illustrating a four-step random access procedure based on a control plane scheme. The method is based on an Early Data Transmission (EDT) scheme in Long Term Evolution (LTE), and a small amount of Data is carried in an Early Data Request (RRC Early Data Request) message sent by a radio resource management layer in a four-step random access process through a message 3(MSG3), where the flow chart is shown in fig. 2 a: when the upper layer sends a connection establishment request of mobile data, UE starts an early data transmission process and selects a random access preamble configured for EDT; step 1, transmitting an early data request message of a radio resource management layer for UE, and connecting user data to a Common Control Channel (CCCH); step 2, starting an S1-AP initial UE message procedure for the base station eNB to forward a Non Access Stratum (NAS) message and establish an S1 connection, where the eNB may indicate that the connection is triggered for EDT; step 3, a Mobile Management Entity (MME) requests a serving-gateway (S-GW) to reactivate an Evolved Packet System (EPS) bearer for the UE; step 4, the MME sends uplink data to the S-GW; step 5, if the downlink data is available, the S-GW sends the downlink data to the MME; step 6, if receiving downlink data from the S-GW, the MME forwards the data to the eNB through a Downlink (DL) non-access stratum NAS transmission process, and may indicate whether further data is needed, otherwise, the MME may trigger a connection establishment indication procedure, and indicate whether further data is needed; step 7, if there is no more data, the eNB may send an early data request message of the radio resource management layer on the CCCH to save the UE in RRC _ IDLE, and connect the downlink data to the early data completion message of the radio resource management layer if they are received in step 6; step 8 is that the connection of S1 is released and the EPS bearer is deactivated.

Referring to fig. 2b, fig. 2b is a schematic diagram illustrating a four-step random access procedure based on a user plane scheme. In the method, a small amount of data is carried in a connection recovery request message sent by the MSG3 in a four-step random access process, the method recovers data and signaling bearer of the UE, the data is transmitted on a Dedicated Traffic Channel (DTCH), and a flow diagram is shown in fig. 2 b: when the upper layer sends a connection recovery request of mobile data, UE starts an early data transmission process and selects a random access preamble configured for EDT; step 1, UE sends a connection recovery request of a radio resource management layer to eNB, including its recovery ID, establishment reason and an authentication token, UE recovers all srb and drb, uses the next opchainingcount provided in the connection release message of the radio resource management layer connected before to assign a new security key and reestablish AS security, user data is encrypted and transmitted on DTCH multiplex, and uses the connection recovery request message of the radio resource management layer on CCCH; step 2 starts S1-AP context recovery procedure for eNB to recover S1 connection and reactivate S1-U bearer; step 3, the MME requests the S-GW to reactivate the S1-U bearer for the UE; step 4, the MME confirms that the context of the UE is restored to the eNB; step 5, transmitting the uplink data to the S-GW; step 6, if the downlink data is available, the S-GW sends the downlink data to the eNB; step 7 is that the eNB may initiate suspension of the S1 connection and deactivation of the S1-U bearer if no further data is expected from the S-GW; step 8 is for the eNB to send a connection release message of the radio resource management layer to save the UE in RRC _ IDLE, which includes releasecoase set to RRC-Suspend, resumeID, next oppoingcount and drb-contensurohc, which are stored by the UE, and if downlink data is received in step 6, they will be sent encrypted on DTCH multiplex and the connection release message of the radio resource management layer is sent on DCCH.

Optionally, the present embodiment further provides a method for configuring a Configured uplink Grant Type one (CG Type 1 )/non-scheduled Transmission Type one (TWG Type 1), where the "uplink resource Transmission data Configured by the base station" in the present invention refers to this method. The method is introduced into an NR new air interface, the method is very similar to the semi-persistent scheduling in LTE, and a network periodically allocates fixed transmission/scheduling resources for UE and indicates the resources through RRC messages. After configuration, the UE may directly transmit data according to the resource indicated in the RRC message without determining the uplink transmission resource according to a Downlink Control Indicator (DCI) in the PDCCH. Unlike Configured Grant Type 2, this configuration also does not need to be activated/deactivated by physical layer signaling. The scheduling method is very suitable for low-delay and high-reliability services with fixed transmission periods/modes, such as VoIP (voice over Internet protocol), or periodic feedback information such as heartbeat, position report and sensor data.

The two-step random access data transmission in the invention refers to a method for directly transmitting data based on the two-step random access process. Referring to fig. 2c, fig. 2c is a diagram illustrating a two-step random access process based on contention access. The method is a two-step random access method obtained by improving the original four-step random access method. As shown in fig. 2c, in the process of the method, when the MSGA transmits the random access preamble signal, a small amount of data can be transmitted on the uplink shared data access channel PUSCH, and when the UE receives the network confirmation, the contention access and the data transmission are considered to be successful, so that the contention-based data access is realized, and the unnecessary signaling burden is reduced.

The methods in fig. 2a, fig. 2b and fig. 2c make it possible for the UE to directly transmit a small amount of uplink data while remaining inactive. However, there is no corresponding discussion and method on how to select the transmission method, i.e., when and under what conditions the UE should select.

Referring to fig. 3, fig. 3 is a schematic flowchart illustrating a data transmission method according to an embodiment of the present application.

301. Under the condition that the terminal is in an inactive state and/or has data to transmit, if the terminal meets a first condition, the terminal transmits the data by using the uplink resource configured by the base station, wherein the first condition is that the base station configures the uplink resource in the inactive state for the terminal.

For the UE in the inactive state, the signaling burden under a specific scene can be greatly reduced by directly transmitting the uplink data while maintaining the inactive state, and the transmission efficiency is improved. For example, in the aspect of smart phone application, the smart phone application comprises instant message data (QQ, WeChat and the like), instant communication, and Heart-eat/keep-alive data of email software, and push notification of various applications; non-smartphone applications include wearable device data (periodic location information, etc.), sensors (industrial wireless sensor networks, periodic or event-triggered transmission of temperature, pressure, etc.), smart meters and smart meter networks (periodic transmission of meter readings). The data transmission method provided by the embodiment can effectively reduce the signaling burden under the above-mentioned scene. The specific process includes that the UE receives data transmission configuration information issued by the base station, when the terminal is in an inactive state and uplink data needs to be transmitted, the UE determines whether a first condition is met, if the first condition is met, the UE remains in the inactive state, and transmits corresponding uplink data by using an uplink resource block Configured in a Configured uplink Grant Type 1 (CG 1) by the base station. The first condition is that the base station configures the CG1 resource in the inactive state for the UE and the uplink timing advance configuration of the UE is currently in an active state, where the active state is that the UE uplink timing advance timer is not expired and the UE is in an uplink synchronization state. Optionally, the first condition may further include one or more other combination conditions, for example, whether the current service type of the UE belongs to a service type set configured by the base station, where the service type may be obtained by an AS layer of the UE through a service parameter transmitted by an NAS layer, or may be determined by the UE according to a QCI attribute of the data service, or may be implemented by the UE. The service type set is configured based on the base station, and the configuration information can be sent by means of system broadcast message, RRC signaling and the like.

Referring to fig. 4, fig. 4 is a schematic flowchart illustrating another data transmission method according to an embodiment of the present disclosure.

401. The terminal receives a data transmission configuration from the base station.

402. And judging whether the terminal is in an inactive state and/or has uplink data transmission.

If the terminal is in the inactive state and/or has uplink data transmission, the following step 403 is performed, and if the terminal is not in the inactive state and/or has uplink data transmission, the following step 404 is performed.

403. And judging whether the terminal meets a first condition or not.

And under the condition that the terminal is in an inactive state and/or has uplink data transmission, judging whether the terminal meets a first condition. If the terminal satisfies the first condition, the following step 405 is performed, and if the terminal does not satisfy the first condition, the following step 407 is performed. Specifically, the first condition is that the base station configures a CG1 resource in an inactive state for the UE and the uplink timing advance configuration of the UE is currently in an active state, where the active state is that the UE uplink timing advance timer is not expired and the UE is in an uplink synchronization state. Optionally, the first condition may further include one or more other combination conditions, for example, whether the current service type of the UE belongs to a service type set configured by the base station, where the service type may be obtained by an AS layer of the UE through a service parameter transmitted by an NAS layer, or may be determined by the UE according to a QCI attribute of the data service, or may be implemented by the UE. The service type set is configured based on the base station, and the configuration information can be sent by means of system broadcast message, RRC signaling and the like.

404. And the terminal enters a connection state to transmit data.

And under the condition that the terminal is not in an inactive state and/or has uplink data transmission, the terminal enters a connected state to transmit data.

405. And the terminal transmits data by adopting the uplink resources configured by the base station.

Under the condition that the terminal is in an inactive state and/or has uplink data transmission and meets one or more combination conditions in the first conditions, the terminal adopts uplink resources configured by the base station to transmit data, so that unnecessary system signaling burden can be reduced, and transmission efficiency is improved.

406. And judging whether the residual data are not transmitted after the uplink resources are used up.

If there is no remaining data to be transmitted after the uplink resource is used up, it indicates that the data transmission is completed, and if there is remaining data to be transmitted after the uplink resource is used up, step 407 is executed.

407. And the terminal selects a method in an inactive state to transmit data.

And under the condition that the residual data are required to be transmitted after the uplink resources are used up, the terminal selects the method in the non-activated state to transmit the data. Specifically, the transmission method in the inactive state includes various possibilities, such as two-step random access, four-step random access, and other transmission methods, and can be applied to corresponding scenes to realize data transmission under different conditions.

408. The data transfer is completed.

Referring to fig. 5a, fig. 5a is a schematic flowchart illustrating another data transmission method according to an embodiment of the present application.

501. And the terminal selects a method in an inactive state to transmit data.

As in step 407 above.

502. And judging whether the base station supports the terminal to adopt two-step random access and the terminal meets a second condition.

If the base station supports the terminal to adopt the two-step random access in the inactive state and the terminal meets the second condition, the terminal adopts the two-step random access in the inactive state to transmit data; if the base station does not support the terminal to adopt the two-step random access in the inactive state or the terminal does not meet the second condition, whether the terminal meets the third condition or not is continuously judged so as to select the corresponding transmission method in the inactive state. Wherein, the second condition has many possibilities, including at least one or more of the following conditions: the current signal intensity of the UE is higher than a target signal threshold, the data volume which needs to be transmitted by the UE currently is smaller than or equal to a first target data volume threshold, the data volume which is transmitted by the UE within a target time is smaller than or equal to a second target data volume threshold, the data service type which needs to be transmitted by the UE currently belongs to a service type set configured by the base station, the data service type which needs to be transmitted by the UE currently does not belong to the service type set configured by the base station, and the random number selected by the terminal is smaller than or equal to a third target threshold.

The UE judges whether the current signal strength is higher than a target signal threshold, the current signal strength can be obtained according to the measurement of the downlink Reference Signal Received Power (RSRP) of the base station, the Reference Signal Received Quality (RSRQ) and the like measured by the UE, the target signal threshold is configured by the base station, the target signal thresholds under different application scenes are different, and the target signal thresholds can be sent in the modes of system broadcast messages, RRC signaling and the like. The data volume that the UE needs to transmit currently is less than or equal to a first target data volume threshold, where the first target data volume threshold is from network configuration and may be sent through system broadcast message, RRC signaling, or the like. The data volume transmitted by the UE in the target time is less than or equal to a second target data volume threshold, and both the target time and the second target data volume threshold are from network configuration and can be sent by system broadcast message, RRC signaling, and the like. The data service type required to be transmitted by the UE currently belongs to a service type set configured by a base station, the service type can be obtained by service parameters transmitted by an AS layer of the UE through an NAS layer, can also be judged by the UE according to QCI attributes of the data service, and can also be realized depending on the UE, the service type set is based on the base station configuration, the configuration information can be sent in the modes of system broadcast messages, RRC signaling and the like, and by the method, the data transmission in an inactive state is only controlled in a specific service type (such AS occasional small amount of 'heartbeat messages'), so that the system burden can be better balanced, and the data transmission efficiency can be improved.

Optionally, the second condition may also be that the UE randomly selects a random number, and determines whether the random number exceeds a third target threshold, that is, a preset threshold K, where the preset threshold K is configured by the base station, and the configuration information may be sent in a system broadcast message, an RRC signaling, and the like.

503. The terminal adopts two-step random access to transmit data.

And under the condition that the base station supports the terminal to adopt the two-step random access in the non-activated state and the terminal meets one or more combined conditions in the second condition, the terminal adopts the two-step random access in the non-activated state to transmit data.

504. And judging whether the terminal meets a third condition.

And judging whether the terminal meets a third condition or not under the condition that the base station does not support the terminal to adopt two-step random access in the non-activated state or the terminal does not meet one or more combined conditions in the second conditions. If the terminal meets the third condition, the terminal adopts four-step random access in the non-activated state to transmit data, and if the terminal does not meet the third condition, the terminal enters the connected state to transmit data. The third condition is that the base station supports the terminal to transmit data by using four-step random access in an inactive state, which may be specifically represented by that the base station configures four-step random access configuration for the UE or that the base station allows the UE to use the four-step random access configuration.

Optionally, the third condition may further include that the UE determines that the current signal strength is higher than the target signal threshold, where the signal strength may be obtained according to measurement of downlink RSRP, RSRQ, and the like of the base station measured by the UE; the target signal threshold is configured by the base station and can be sent in the modes of system broadcast messages, RRC signaling and the like, and the method ensures that small data transmission in the non-activated state is only carried out on UE with better signals, and ensures the success rate and quality of data transmission. It is noted that the above condition is only one optional condition of the third condition.

Optionally, the third condition may further include that the data amount that the UE needs to transmit currently is less than or equal to a third target data amount threshold, where the third target data amount threshold is from network configuration and may be sent in a system broadcast message, RRC signaling, or the like. It is noted that the above condition is only one optional condition of the third condition.

505. The terminal adopts four-step random access to transmit data.

And if the terminal meets the third condition, the terminal transmits data by adopting four-step random access in the inactive state under the condition that the base station does not support the terminal to adopt two-step random access in the inactive state or the terminal does not meet one or more combined conditions in the second condition.

506. And the terminal enters a connection state to transmit data.

And if the terminal does not meet the third condition, the terminal enters a connection state to transmit data under the condition that the base station does not support the terminal to adopt two-step random access in the non-activated state or the terminal does not meet one or more combined conditions in the second conditions.

In particular, other data transmission methods can be extended by modifying the conditions in the embodiment provided in fig. 5a, and such a method should be considered as a reasonable variation of the embodiment in fig. 5a and also fall within the scope of the present embodiment. Referring to fig. 5b, fig. 5b is a schematic flow chart of another data transmission method according to an embodiment of the present application, which is also based on a reasonable variation of fig. 5 a. As shown in fig. 5b, the second condition in the embodiment provided in fig. 5a is that the base station configures a two-step random access configuration for the terminal and the current signal strength of the terminal is higher than the target signal threshold, and the third condition is that the base station configures a four-step random access configuration for the terminal. Therefore, under the condition that the terminal selects the data transmission in the inactive state, if the base station configures two-step random access configuration for the terminal and the current signal intensity of the terminal is higher than the target signal threshold value, the terminal adopts two-step random access to transmit the data; if the conditions that the base station configures two-step random access configuration for the terminal and the current signal intensity of the terminal is higher than the target signal threshold are not met, but the conditions that the base station configures four-step random access configuration for the terminal are met, the terminal adopts four-step random access to transmit data; if the conditions that the base station configures two-step random access configuration for the terminal and the current signal intensity of the terminal is higher than the target signal threshold value are not met, and meanwhile, the base station configures four-step random access configuration for the terminal, the terminal enters a connection state to transmit data.

Referring to fig. 6, fig. 6 is a schematic flowchart illustrating another data transmission method according to an embodiment of the present application.

601. And the terminal selects a method in an inactive state to transmit data.

And under the condition that the terminal does not meet the preset condition 1, the terminal selects a method in an inactive state to transmit data. The preset condition 1 includes that the base station configures Configured Grant Type 1/TWG Type 1 resources in an inactive state for the UE, and the uplink timing advance configuration of the UE is currently in an active state, where the active state refers to that the uplink timing advance timer of the UE is not overtime and the UE is in an uplink synchronization state. Meanwhile, the preset condition 1 may further include one or more other combination conditions, that is, the other combination conditions are all selectable conditions, for example, the current service type of the UE satisfies a specific type category, the "service type" may be obtained by an AS layer of the UE through a service parameter transmitted by an NAS layer, may be determined by the UE according to a QCI attribute of the data service, and may also be implemented depending on the UE, the service type category is based on base station configuration, and the configuration information may be sent in a system broadcast message, RRC signaling, or the like. It should be noted that the preset condition 1 in the embodiment of the present application is a "first condition" in this document, and the conditions that the two conditions need to be satisfied by the terminal are essentially the same.

602. And judging whether the terminal meets a preset condition 2.

Under the condition that the terminal selects the method in the inactive state to transmit data, the terminal needs to be judged according to which method in the inactive state is adopted to transmit data, and whether the terminal meets the preset condition 2 is judged. The preset condition 2 includes that the base station configures/grants the UE at least one of a two-step random access scheme and a four-step random access scheme, and the condition is a "fourth condition" in the present application, and the conditions that the base station and the UE need to satisfy the terminal are essentially the same. Meanwhile, the preset condition 2 may further include one or more other combined conditions, that is, the rest are all selectable conditions, for example: the data volume that the UE needs to send at present is less than or equal to the data volume threshold D1, the threshold D1 comes from network configuration, can send by way of system broadcast message, RRC signalling, etc.; the transmitted data amount of the UE in the last period of time T1 is less than or equal to the data amount threshold D2, the time interval T1, the data amount threshold D2 is from network configuration, and may be transmitted by system broadcast message, RRC signaling, etc.; the current service type of the UE belongs to or does not belong to a pre-configured service type category, the "service type" may be obtained by a service parameter transmitted by an AS layer of the UE through an NAS layer, or may be determined by the UE according to a QCI attribute of the data service, or may be implemented depending on the UE, the service type category is based on base station configuration, and the configuration information may be sent through a system broadcast message, RRC signaling, or other manners. The optional condition included in the preset condition 2 is a "fifth condition" in this application, and the optional conditions are essentially the same for the terminal to satisfy. It should be noted that the preset condition 2 in the embodiment of the present application is a combination of "fourth condition" and "fifth condition" in this document, and the conditions that need to be satisfied by the terminal are essentially the same.

603. And judging whether the terminal meets a preset condition 3.

And under the condition that the terminal meets the preset condition 2, continuously judging whether the terminal meets the preset condition 3. The preset condition 3 includes whether the base station configures or permits the UE to use two-step random access configuration. Meanwhile, the preset condition 3 further includes one or more of the following combination conditions, for example: the UE judges that the current signal strength meets a preset threshold value P1, and the signal strength can be measured according to downlink RSRP, RSRQ and the like of a base station measured by the UE; the threshold value P1 is configured by the base station and can be sent by means of system broadcast messages, RRC signaling and the like, and the method ensures that small data transmission in an inactive state is only carried out on UE with better signals, and ensures the success rate and quality of data transmission; the data volume that the UE needs to send at present is less than or equal to the data volume threshold D3, the threshold D3 comes from network configuration, can send by way of system broadcast message, RRC signalling, etc.; the transmitted data amount of the UE in the last period of time T2 is less than or equal to the data amount threshold D4, and the time interval T2 and the data amount threshold D4 are from network configuration and may be transmitted by system broadcast message, RRC signaling, etc.; the data service type which needs to be sent by the UE currently belongs to or does not belong to a service type category which is configured in advance, the service type can be obtained by service parameters transmitted by an AS layer of the UE through an NAS layer, the UE can judge according to QCI attribute of the data service and can be realized depending on the UE, the service type category is based on base station configuration, and the configuration information can be sent in a mode of system broadcast message, RRC signaling and the like, so that the method controls the non-activated data transmission to be only in a specific service type, such AS occasional small amount of heartbeat messages, and the system burden and the data transmission efficiency are better balanced; the UE randomly selects a random number and judges whether the value of the random number exceeds a preset threshold K, the threshold K is configured by the base station, the configuration information can be sent in the modes of system broadcast messages, RRC signaling and the like, the method can control the transmission scale of the inactive state data of the whole cell on a certain probability, and random access collision and sending failure caused by sending data in the inactive state at the same time by a large number of terminals are avoided. It should be noted that the preset condition 3 in the embodiment of the present application is a "second condition" in the present application, and the conditions that the two conditions need to be satisfied by the terminal are substantially the same.

604. And judging whether the terminal meets a preset condition 4.

And under the condition that the terminal meets the preset condition 2 but does not meet the preset condition 3, continuously judging whether the terminal meets the preset condition 4. The preset condition 4 includes whether the base station configures or permits the UE to use the four-step random access configuration. Meanwhile, the preset condition 4 may further include one or more other combined conditions, that is, the rest are all selectable conditions, for example: the UE judges whether the current signal strength meets a preset threshold value P2, the signal strength can be measured according to downlink RSRP, RSRQ and the like of a base station measured by the UE, the threshold value is configured by the base station and can be sent in the modes of system broadcast messages, RRC signaling and the like, and by the method, the small data transmission in an inactive state is only carried out on the UE with good signals, and the success rate and the quality of data transmission are ensured; whether the data volume that the UE needs to send currently is less than or equal to the data volume threshold D5, where the threshold D5 is derived from network configuration and may be sent by system broadcast message, RRC signaling, or the like. It should be noted that the preset condition 4 in the embodiment of the present application is a "third condition" in the present application, and the conditions that the two conditions need to satisfy for the terminal are essentially the same.

605. The terminal adopts two-step random access to transmit data.

Based on the above judgment on what kind of conditions the terminal satisfies, the terminal transmits data by two-step random access under the condition that the terminal satisfies the preset conditions 2 and 3.

606. The terminal adopts four-step random access to transmit data.

Based on the above judgment on what kind of conditions the terminal satisfies, the terminal adopts four-step random access to transmit data under the condition that the terminal satisfies the preset condition 2 but does not satisfy the preset condition 3, and simultaneously satisfies the preset condition 4.

607. And the terminal enters a connection state to transmit data.

Based on the judgment on what kind of conditions the terminal meets, the terminal enters a connection state to transmit data under the condition that the terminal does not meet the preset condition 2; and under the condition that the terminal meets the preset condition 2, but does not meet the preset condition 3, and simultaneously does not meet the preset condition 4, the terminal also adopts four-step random access to transmit data.

The method of the embodiments of the present application is set forth above in detail and the apparatus of the embodiments of the present application is provided below.

Referring to fig. 7, fig. 7 is a schematic structural diagram of a data transmission device according to an embodiment of the present application. The device includes: a transmission unit 71. Wherein:

a transmission unit 71, configured to transmit data using uplink resources configured by a base station if a terminal is in an inactive state and/or has data to transmit, where the terminal meets a first condition that the base station configures the uplink resources in the inactive state for the terminal.

Further, the above apparatus further comprises:

and a selecting unit 72, configured to select an inactive method to transmit data when there is data to be transmitted after the uplink resource is consumed.

Further, the selecting unit 72 is further configured to select the method in the inactive state to transmit data if the terminal does not satisfy the first condition under the condition that the terminal is in the inactive state and/or data needs to be transmitted.

Further, the selecting unit 72 is specifically configured to transmit data by using two-step random access or four-step random access in an inactive state.

Further, the selecting unit 72 is specifically configured to, in a case that the base station supports the terminal to adopt the two-step random access in the inactive state, if the terminal meets a second condition, adopt the two-step random access in the inactive state to transmit data; the second condition includes at least one of: the current signal strength of the terminal is higher than a target signal threshold, the data volume required to be transmitted by the terminal currently is smaller than or equal to a first target data volume threshold, the data volume transmitted by the terminal within a target time is smaller than or equal to a second target data volume threshold, the data service type required to be transmitted by the terminal currently belongs to the service type set configured by the base station, the data service type required to be transmitted by the terminal currently does not belong to the service type set configured by the base station, and the random number selected by the terminal is smaller than or equal to a third target threshold.

Further, the selecting unit 72 is specifically configured to, when the base station does not support the two-step random access performed by the terminal in the inactive state or the terminal does not satisfy the second condition, if the terminal satisfies a third condition, transmit data by using four-step random access performed in the inactive state, where the third condition is that the base station supports the four-step random access performed by the terminal in the inactive state; the second condition includes at least one of: the current signal strength of the terminal is higher than the target signal threshold, the data volume required to be transmitted by the terminal currently is smaller than or equal to the first target data volume threshold, the data volume transmitted by the terminal within the target time is smaller than or equal to the second target data volume threshold, the data service type required to be transmitted by the terminal currently belongs to the service type set configured by the base station, the data service type required to be transmitted by the terminal currently does not belong to the service type set configured by the base station, and the random number selected by the terminal is smaller than or equal to a third target threshold.

Further, the selecting unit 72 is specifically configured to enter a connected state to transmit data when the terminal does not satisfy a fourth condition, where the fourth condition is that the base station supports the terminal to adopt at least one of two-step random access and four-step random access in an inactive state.

Further, the selecting unit 72 is specifically configured to enter the connected state to transmit data when the terminal does not satisfy the second condition and the third condition.

Further, the selecting unit 72 is specifically configured to select to enter the connection state for transmitting data when the terminal does not satisfy the fourth condition and does not satisfy the fifth condition.

According to the embodiment of the present application, each step involved in the method executed by the terminal in fig. 3, fig. 4, fig. 5a, fig. 5b, and fig. 6 may be executed by each unit in the apparatus shown in fig. 7. For example, 301 shown in fig. 3 is performed by 71 shown in fig. 7; as another example, 407 shown in FIG. 4 is performed by 72 shown in FIG. 7.

According to the embodiment of the present application, the units in the apparatus shown in fig. 7 may be respectively or entirely combined into one or several other units to form a structure, or some unit(s) therein may be further split into multiple functionally smaller units to form a structure, which may achieve the same operation without affecting the achievement of the technical effect of the embodiment of the present application. The units are divided based on logic functions, and in practical application, the functions of one unit can be realized by a plurality of units, or the functions of a plurality of units can be realized by one unit. In other embodiments of the present application, the terminal-based terminal may also include other units, and in practical applications, these functions may also be implemented by being assisted by other units, and may be implemented by cooperation of multiple units.

Based on the description of the method embodiment and the device embodiment, the embodiment of the application further provides a schematic structural diagram of the terminal. As shown in fig. 8, the terminal 800 corresponds to the terminal in the above-described embodiment, and the terminal 800 may include: at least one processor 801, e.g., a CPU, at least one network interface 804, a user interface 803, a memory 805, at least one communication bus 802. Wherein a communication bus 802 is used to enable connective communication between these components. The user interface 803 may include a display screen (display) and an input device, and the optional user interface 803 may also include a standard wired interface and a wireless interface. The network interface 804 may optionally include a standard wired interface, a wireless interface (e.g., WI-FI interface). Memory 805 may be a high-speed RAM memory or a non-volatile memory, such as at least one disk memory. The memory 805 may optionally also be at least one memory device located remotely from the processor 801 as previously described. As shown in fig. 8, the memory 805, which is a kind of computer storage medium, may include therein an operating system, a network communication module, a user interface module, and a device control application program.

In the terminal 800 shown in fig. 8, the network interface 804 is mainly used for connecting other terminal devices; and the user interface 803 is primarily an interface for providing input to a user; and the processor 801 may be used to invoke the device control application stored in the memory 805 to implement: under the condition that a terminal is in an inactive state and/or has data to be transmitted, if the terminal meets a first condition, the terminal transmits the data by using uplink resources configured by a base station, wherein the first condition is that the base station configures the uplink resources in the inactive state for the terminal. It should be understood that the terminal 800 may perform the operations performed by the terminal in the foregoing embodiments, such as the operations performed by the terminal in fig. 3.

Further, here, it is to be noted that: an embodiment of the present application further provides a computer-readable storage medium, where a computer program executed by the aforementioned terminal is stored in the computer-readable storage medium, and the computer program includes program instructions, and when the processor executes the program instructions, the description of the data transmission method in the embodiment corresponding to fig. 3 or fig. 4 or fig. 5a or fig. 5b or fig. 6 can be executed, so that details are not repeated here. In addition, the beneficial effects of the same method are not described in detail. For technical details not disclosed in embodiments of the computer-readable storage medium referred to in the present application, reference is made to the description of embodiments of the method of the present application.

It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by a computer program, which can be stored in a computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. The storage medium may be a magnetic disk, an optical disk, a read-only memory (ROM), a Random Access Memory (RAM), or the like.

The above disclosure is only for the purpose of providing examples, and it is not intended to limit the scope of the claims, so that the claims and their equivalents will fall within the scope of the claims.

Claims

1. A method of data transmission, comprising:

2. The method of claim 1, wherein the first condition comprises:

3. The method of claim 1, wherein after the terminal transmits data using the uplink resource configured by the base station, the method further comprises:

4. The method of claim 1, further comprising:

5. The method according to claim 3 or 4, wherein the terminal selects the inactive method to transmit data comprises:

6. The method of claim 5, wherein the terminal transmits data by using two-step random access or four-step random access in an inactive state comprises:

7. The method of claim 5, wherein the terminal transmits data by using two-step random access or four-step random access in an inactive state comprises:

8. The method of claim 7, wherein the third condition is that the base station supports the terminal to transmit data using four-step random access in an inactive state.

9. The method of claim 6 or 7, wherein the second condition comprises at least one of: the current signal strength of the terminal is higher than the target signal threshold, the data volume required to be transmitted by the terminal currently is smaller than or equal to the first target data volume threshold, the data volume required to be transmitted by the terminal within the target time is smaller than or equal to the second target data volume threshold, the data service type required to be transmitted by the terminal currently belongs to the service type set configured by the base station, the data service type required to be transmitted by the terminal currently does not belong to the service type set configured by the base station, and the random number selected by the terminal is smaller than or equal to the third target threshold.

10. The method according to claim 3 or 4, characterized in that the method further comprises:

11. The method of claim 10, wherein the fourth condition is that the base station supports the terminal to employ at least one of two-step random access and four-step random access in an inactive state.

12. The method of claim 7, further comprising:

13. The method of claim 1, wherein the first condition comprises at least one of:

14. The method of claim 7, wherein the third condition comprises at least one of:

15. The method of claim 10, further comprising:

16. The method of claim 15, wherein the fifth condition comprises at least one of:

17. The method according to claim 9 or 14 or 16, wherein at least one of the target signal threshold, the first target data amount threshold, the second target data amount threshold, the third target threshold and the set of base station configured traffic types is transmitted to the terminal by a broadcast message and/or radio resource management layer RRC signaling.

18. A data transmission apparatus, comprising:

19. The apparatus of claim 18, further comprising:

20. The apparatus according to claim 19, wherein the selecting unit is further configured to select the inactive method to transmit data if the terminal does not satisfy the first condition when the terminal is in an inactive state and/or has data to transmit.

21. The apparatus according to claim 20, wherein the selecting unit is specifically configured to transmit data using two-step random access or four-step random access in an inactive state.

22. The apparatus of claim 21, wherein the selecting unit is further configured to transmit data by using two-step random access in an inactive state if the base station supports the terminal to use two-step random access in the inactive state, and if the terminal meets a second condition.

23. The apparatus of claim 22, wherein the selecting unit is further configured to transmit data by using four-step random access in an inactive state if the base station does not support the terminal to use two-step random access in the inactive state or the terminal does not satisfy the second condition, if the terminal satisfies a third condition.

24. The apparatus according to claim 23, wherein the selecting unit is further configured to select to enter the connected state for transmitting data if the fourth condition is not satisfied by the terminal.

25. The apparatus of claim 24, wherein the selecting unit is further configured to select to enter a connected state to transmit data if the terminal does not satisfy the second condition and the third condition.

26. The apparatus according to claim 25, wherein the selecting unit is further configured to select to enter the connected state for transmitting data if the terminal does not satisfy the fourth condition and does not satisfy the fifth condition.

27. An electronic device, comprising: a processor and a memory, wherein the memory stores program instructions that, when executed by the processor, cause the processor to perform the method of any of claims 1 to 17.

28. A computer-readable storage medium having stored thereon one or more instructions adapted to be loaded by the processor and to perform the method of any of claims 1 to 17.