WO2014019441A1

WO2014019441A1 - Method, apparatus, system, and related device for data transmission

Info

Publication number: WO2014019441A1
Application number: PCT/CN2013/079007
Authority: WO
Inventors: 江小威; 吴伟民
Original assignee: 中国移动通信集团公司
Priority date: 2012-07-30
Filing date: 2013-07-08
Publication date: 2014-02-06
Also published as: CN103580817A; CN103580817B

Abstract

Disclosed are a method, apparatus, system, and related device for data transmission, for use in ensuring the reliability of data transmission in an idle state. The method for data transmission comprises: receiving a data transmission request transmitted by an MTC terminal in an idle state; acquiring the service type of a service used by the MTC terminal; selecting a data retransmission mode on the basis of the service type; and retransmitting previously-transmitted downlink data according to the selected data retransmission mode.

Description

The present invention claims to be submitted to the Chinese Patent Office on July 30, 201, and the application number is 201 21 0268679. 3. The invention name is "a data transmission method, device, system" The priority of the Chinese patent application, the entire disclosure of which is incorporated herein by reference. Technical field

The present invention relates to the field of wireless communication technologies, and in particular, to a data transmission method, apparatus, system, and related device.

Background technique

Machine-Type Communication (MTC) refers to the communication between a machine and a machine or a machine to machine (M2M). It is a communication method that does not require people to participate. As shown in FIG. 1 , which is a schematic diagram of a communication scenario of an MTC terminal in the prior art, each MTC terminal communicates with an MTC server through an operator network, and each MTC terminal can send uplink data to the MTC server or downlink sent by the MTC server. Data, in which data is transmitted between the MTC terminal and the MTC server through the base station.

With the rapid development of M2M services, the scale of MTC terminals will increase rapidly, and the number of MTC terminals in the same cell may reach tens of thousands. The core network specification 3GPP 22. 368 defines 16 important features of the MTC terminal, including low mobility, time control, delay tolerance, online small data transmission, etc., for different applications, including meter reading applications, remote Control, etc., may have a combination of one or several features.

At present, the hotspots for MTC research mainly focus on whether it is necessary to optimize the network for this type of communication, especially if the massive MTC terminal is applied to the actual network in the future, whether it will be between human and human (Human to Human). Communication has an impact. For the M2M service, one of the important services is that the terminal collects data and reports it. For example, it collects related data such as smart meters, water meters, and gas meters. The characteristics of this type of service are that the amount of data collected is small and the sending time is small. Fixed interval, Also access the network. However, if the MTC terminals in the same cell access the network at the same time, the network will be congested. In order to solve the above problem, the prior art proposes a data transmission method in an idle state, that is, when the MTC terminal is in a connected state, the network side allocates resources for transmitting data in an idle state for the MTC terminal, when the MTC terminal is in an idle state. The data allocated by the network side for transmitting data in the idle state can be utilized. The data transmission method in the idle state described above can solve the network congestion problem caused by a large number of MTCs simultaneously accessing the network. However, the method does not consider the packet loss problem in the data transmission process, thereby reducing the reliability of data transmission in the idle state. Summary of the invention

Embodiments of the present invention provide a data transmission method, apparatus, system, and related device for ensuring reliability of data transmission in an idle state.

The embodiment of the invention provides a data transmission method, including:

Receiver type communication A data transmission request sent by the MTC terminal in an idle state; obtaining a service type of a service used by the MTC terminal;

Select a data retransmission mode according to the service type;

The transmitted downlink data is retransmitted according to the selected data retransmission mode.

An embodiment of the present invention provides a data transmission apparatus, including:

a receiving unit, configured to receive data transmission request by the MTC terminal in an idle state;

An obtaining unit, configured to obtain a service type of a service used by the MTC terminal;

a selecting unit, configured to select a data retransmission mode according to the service type obtained by the obtaining unit, and a transmitting unit, configured to retransmit the transmitted downlink data according to the selected data retransmission manner. The embodiment of the invention provides a base station device, which comprises the above data transmission device.

An embodiment of the present invention provides another data transmission method, including:

In the idle state, sending a data transmission request to the network side; Receiving a feedback message sent by the network side;

Retransmitting the transmitted uplink data according to the feedback message.

An embodiment of the present invention provides another data transmission apparatus, including:

a sending unit, configured to send a data transmission request to the network side when the terminal device is in an idle state;

a receiving unit, configured to receive a feedback message sent by the network side;

And a transmitting unit, configured to retransmit the transmitted uplink data according to the feedback message.

The embodiment of the invention provides a terminal device, which comprises the above data transmission device.

The data transmission method, device, system, and related device provided by the embodiment of the present invention, when the MTC terminal requests data transmission in an idle state, after receiving the request of the MTC terminal, the network side obtains the service type used by the MTC terminal, And determining, according to the type used by the MTC terminal, that the reliability of data transmission with the MTC terminal needs to be ensured, selecting a data retransmission mode, and retransmitting the transmitted data according to the selected data retransmission manner; The terminal side retransmits the transmitted data according to the feedback message of the data transmission in the idle state returned by the received network side, and the packet loss processing mechanism is provided in the data transmission process, thereby ensuring the data transmission in the idle state. Reliability.

Other features and advantages of the invention will be set forth in the description which follows, The objectives and other advantages of the invention will be realized and attained by the <RTI DRAWINGS

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the description of the prior art will be briefly described below. Obviously, the drawings in the following description are only It is some embodiments of the present invention, and those of ordinary skill in the art, Other drawings may also be obtained from these drawings without paying for creative labor.

1 is a schematic diagram of a communication scenario of an MTC terminal in the prior art;

2 is a schematic flowchart of an implementation process of a network-side data transmission method according to an embodiment of the present invention; FIG. 3 is a schematic structural diagram of a first data transmission device according to an embodiment of the present invention;

4 is a schematic flowchart of a method for implementing a data transmission method on a terminal side according to an embodiment of the present invention; FIG. 5 is a schematic structural diagram of a second data transmission device according to an embodiment of the present invention;

FIG. 6 is a schematic structural diagram of a data transmission system according to an embodiment of the present invention. detailed description

In order to ensure the reliability of the data transmission in the idle state, the embodiment of the present invention provides a data transmission method, device, system, and related device. The data transmission method provided by the embodiment of the present invention is applicable to data transmission in a machine type communication scenario.

The preferred embodiments of the present invention are described with reference to the accompanying drawings, and the preferred embodiments described herein are intended to illustrate and explain the present invention, and are not intended to limit the invention, and the first embodiment is intended to include the following steps:

S201. The base station receives a data transmission request sent by the MTC terminal in an idle state.

Specifically, when the MTC terminal is in an idle state, the base station is requested to perform data transmission.

S202. The base station obtains a service type of a service used by the MTC terminal.

Specifically, the base station can obtain the service type of the service used by the MTC terminal in the following two ways: 1) the data transmission request sent by the MTC terminal to the base station carries the terminal identifier, and after receiving the data transmission request sent by the MTC terminal, the base station receives the data transmission request Obtaining, according to the terminal identifier of the MTC terminal, a service type of the service used by the MTC terminal from the core network; 2) transmitting the base to the MTC terminal The data transmission request of the station carries the service type of the service used by the MTC terminal. In this case, the base station can directly obtain the service type of the service used by the MTC terminal from the data transmission request.

5203. The base station selects a data retransmission mode according to the obtained service type.

In a specific implementation, according to the obtained service type, when determining the reliability of data transmission between the MTC terminal and the MTC terminal, the base station may perform data retransmission using any of the following data retransmission modes:

Method 1 Physical layer multiple transmission mode

If the base station uses the mode, the base station can carry the number of data retransmissions in the feedback message for returning the data transmission request to the MTC terminal.

Mode 2 HARQ (Hybrid Automatic Repeat Request)

If the base station adopts the mode, the base station may carry the first maximum retransmission number of the HARQ in the feedback message that returns the data transmission request to the MTC terminal, and may also optionally carry the received HARQ feedback result as the ACK (acknowledgement) signaling. The number of times.

Mode 3 HARQ combined with ARQ (Automatic Repeat Request)

This method can avoid the problem of data transmission error caused by the error of the HARQ feedback. For example, the MTC terminal correctly receives the downlink data at a certain time, but the feedback result is NACK signaling, and the ARQ feedback can be used for data transmission check. In this manner, the base station may carry the second maximum number of retransmissions of the HARQ in the feedback message that returns the data transmission request to the MTC terminal, to

S204: The base station retransmits the transmitted downlink data according to the selected data retransmission mode. In a specific implementation, when the base station transmits the downlink data to the MTC terminal in the idle state, if the base station uses the method 1 to perform data retransmission, for each downlink data, after the base station transmits the downlink data for the first time, the downlink sub-data is transmitted. Perform data retransmission on the same resource location of the frame until the number of retransmissions reaches the set number of data retransmissions; if the base station uses mode 2 to perform data retransmission, For each downlink data, whether the MTC terminal feedback result is ACK signaling or NACK (non-acknowledgment) signaling, the base station needs to retransmit the downlink data at the retransmission time until the number of retransmissions reaches the first maximum retransmission number of HARQ or The feedback result received by the base station is that the number of ACK signaling reaches a preset number of times, wherein the MTC terminal feeds back the result in the ACK/NACK feedback position of the PUCCH (Physical Downlink Control Channel) or the PHICH (Physical Retransmission Request Indicator Channel). If the base station uses the third method for data retransmission, for each downlink data, the base station retransmits at the retransmission time until the number of retransmissions reaches the second maximum retransmission number of the HARQ, and for each transmitted downlink data, The MTC terminal feeds back the ARQ feedback result of the downlink data according to the time-frequency resource location corresponding to the received time-frequency resource location information.

Specifically, in a specific implementation, when the base station uses the second method to perform data retransmission for each downlink data, if the base station receives the HARQ feedback result fed back by the MTC terminal, the number of ACKs is less than the preset number of times, or the base station adopts the mode. When the data is retransmitted, the data transmission method provided by the embodiment of the present invention may further include the following steps:

Step 1: Determine a retransmission resource, where the retransmission resource is used to retransmit downlink data whose HARQ feedback result is ACK less than the preset number of times or the received ARQ feedback result is NACK downlink data;

Step 2: Retransmit the downlink data whose HARQ feedback result is ACK times that does not reach the preset number of times on the determined retransmission resource or the downlink data of the received ARQ feedback result is NACK.

Preferably, the transmission resources used for retransmission are determined in the following ways:

1) a cell radio network temporary identifier (C-RNTI, when the Cell Radio Network Temporary Identifier M is available to the MTC terminal) when the base station is in the connected state, the base station can use the C-RNTI to allocate retransmission resources to the MTC terminal;

2) The MTC terminal initiates random access, and determines the fourth step of the random access, that is, the base station feeds back the transmission resource used by the RRC (Radio Resource Control) connection request to the MTC terminal as the retransmission resource; 3) The MTC terminal ends the current idle state transmission mode, re-enters the connection state, and the base station determines the transmission resource allocated for the MTC terminal as the retransmission resource.

In the data transmission method provided in the first embodiment, when the MTC is in an idle state and requests data transmission, if the base station determines that the data transmission reliability between the MTC terminal and the MTC terminal is required according to the service type used by the MTC terminal, the base station may select The physical layer transmits multiple times or HARQ or HARQ combined with the ARQ method to ensure the reliability of data transmission and reduce the possibility of packet loss during data transmission.

Embodiment 2

Based on the same inventive concept, the second embodiment provides a data transmission device. Since the principle of the device is similar to the data transmission method, the implementation of the device can be referred to the implementation of the method, and the repeated description is omitted.

As shown in FIG. 3, a schematic structural diagram of a data transmission apparatus according to an embodiment of the present invention includes: a receiving unit 301, configured to receive a data transmission request sent by an MTC terminal in an idle state; and an obtaining unit 302, configured to obtain an MTC terminal The type of business of the business being used;

The selecting unit 303 is configured to select a data retransmission mode according to the service type obtained by the obtaining unit 302.

The transmitting unit 304 is configured to retransmit the transmitted downlink data according to the data retransmission mode selected by the selecting unit 303.

In a specific implementation, the obtaining unit 302 may be configured to obtain a service type of the service used by the MTC terminal from the core network, or may be used to obtain the MTC from the data transmission request when the data transmission request carries the service type of the service used by the MTC. The type of service of the service used by the terminal.

The data retransmission mode is the physical layer multiple transmission mode (method 1) or the hybrid automatic retransmission request HARQ mode (method 2) or the HARQ combined automatic retransmission request ARQ mode (method 3).

In a specific implementation, the data transmission apparatus provided by the embodiment of the present invention may further include: a sending unit, configured to return a feedback message of the data transmission request to the MTC terminal, where the data retransmission mode is carried in the feedback message if the data retransmission mode is the physical layer multiple transmission mode; In the HARQ mode, the first maximum retransmission number of the HARQ is carried in the feedback message, or the first maximum retransmission number of the HARQ carrying the HARQ and the received HARQ feedback result are the number of times of acknowledgment ACK signaling; When the retransmission mode is the HARQ mode and the ARQ mode, the feedback message carries the second maximum retransmission number of the HARQ and the time-frequency resource location information used by the ARQ feedback corresponding to each data transmission.

The transmitting unit 304 may be configured to retransmit the transmitted downlink on the transmission resource used for the first transmission of the downlink data after the first transmission of the downlink data, if the base station uses the mode 1 to transmit, and the feedback message carries the number of data retransmissions. Data until the number of retransmissions reaches the number of data retransmissions; or

If the base station uses mode 2 for transmission, and the feedback message carries the first maximum number of retransmissions of the HARQ, the transmission unit 304 may be configured to retransmit the transmitted downlink data at the retransmission time until the number of retransmissions reaches the HARQ. The maximum number of retransmissions;

If the base station uses the second mode of transmission, and the feedback message carries the first maximum number of retransmissions of the HARQ and the received HARQ feedback result is the number of ACK signaling, the transmission unit 304 can be used to retransmit at the retransmission time. The downlink data is transmitted until the number of retransmissions reaches the first maximum number of retransmissions of the HARQ or the number of received HARQ feedbacks is ACK reaches a preset number of times; if the base station uses the third mode of transmission, the HARQ is carried in the feedback message. When the first maximum number of retransmissions and the received HARQ feedback result are the number of ACK signaling, the transmitting unit 304 may be configured to retransmit the transmitted downlink data at the retransmission time until the retransmission times reach the second maximum retransmission of the HARQ. In this manner, the receiving unit 301 is further configured to receive an ARQ feedback result of the transmitted downlink data sent by the MTC terminal, where the ARQ feedback result is a time-frequency resource corresponding to the time-frequency resource location information of the MTC terminal. Sent on the location.

In a specific implementation, the data transmission apparatus provided by the embodiment of the present invention may further include a determining unit, among them:

The determining unit may be configured to: when the received HARQ feedback result is not the preset number of times, or the received ARQ feedback result is NACK, determine that the number of times for resending the HARQ feedback result is ACK does not reach the preset The downlink data of the number of times or the received ARQ feedback result is a retransmission resource used by the downlink data of the NACK;

The transmitting unit 304 may be further configured to: retransmit the downlink data whose number of times the HARQ feedback result is ACK is not up to a preset number of times or the downlink data whose received ARQ feedback result is NACK, on the retransmission resource determined by the determining unit.

The determining unit may be configured to use a cell radio network temporary identifier that is allocated to the MTC terminal in the connected state to allocate a retransmission resource to the MTC terminal, or may be used to determine that the radio resource is fed back when the MTC terminal initiates the random access. The transmission resource used by the RRC connection request is used as the retransmission resource; or may be used to determine the transmission resource allocated to the MTC terminal as the retransmission resource when the MTC terminal re-enters the connection state.

It should be noted that, in a specific implementation, the data transmission apparatus provided in Embodiment 2 may be disposed in a base station apparatus.

Embodiment 3

The third embodiment provides a terminal-side data transmission method. The method is based on the same inventive concept as the first embodiment. The method for solving the problem is similar to the data transmission method of the first embodiment. Therefore, the method can be implemented by referring to the method in the first embodiment. The implementation, the repetition will not be repeated.

As shown in FIG. 4, it is a schematic diagram of an implementation process of the terminal side data transmission method, which may include the following steps:

5401. When the MTC terminal is in an idle state, send a data transmission request to the network side.

5402. The MTC terminal receives a feedback message sent by the network side.

S403. The MTC terminal retransmits the transmitted uplink data according to the received feedback message. The feedback message received by the MTC terminal may carry the number of data retransmissions or carry The first maximum number of retransmissions with HARQ, or the number of first maximum retransmissions with HARQ and the number of received HARQ feedbacks is the number of acknowledgment ACK signaling, or the number of second maximum retransmissions with HARQ and each time The time-frequency resource location information used by the ARQ feedback corresponding to the uplink data transmission.

Based on this, in step S403, the MTC terminal retransmits the transmitted uplink data according to the received feedback message, and the packet may be in the following manners:

method one

If the feedback message received by the MTC terminal carries the number of data retransmissions, the MTC terminal retransmits the transmitted uplink data on the transmission resource used for the first transmission of the uplink data after the first transmission of the uplink data, until the number of retransmissions reaches the data. The number of retransmissions.

Way two

If the feedback message received by the MTC terminal carries the first maximum number of retransmissions of the HARQ, for each uplink data, regardless of whether the HARQ feedback result of the uplink data is ACK or NACK, the MTC terminal retransmits the uplink at the retransmission time. Data, until the number of retransmissions reaches the first maximum number of retransmissions of HARQ.

Way three

If the feedback message received by the MTC terminal carries the first maximum retransmission number of the HARQ and the received HARQ feedback result is the number of ACK signaling acknowledgments, the HARQ feedback result of the uplink data is The ACK is still a NACK, and the MTC terminal retransmits the transmitted uplink data at the retransmission time until the number of retransmissions reaches the first maximum number of retransmissions of the HARQ or the number of received HARQ feedbacks is ACK reaches a preset number of times.

Way four

If the feedback message received by the MTC terminal carries the second maximum retransmission number and row data of the HARQ, whether the HARQ feedback result of the uplink data is ACK or NACK, the MTC terminal Retransmitting the transmitted uplink data at the retransmission time until the number of retransmissions reaches the second maximum number of retransmissions of the HARQ; and receiving the ARQ feedback result by the network side at the time-frequency resource location corresponding to the time-frequency resource location information.

Specifically, in a specific implementation, if the MTC terminal uses the third or fourth method to retransmit the transmitted uplink data, if the number of HARQ feedbacks received by the MTC terminal is ACK, the number of times does not reach the preset number of times, or the received When the ARQ feedback result is a NACK, the data transmission method provided by the embodiment of the present invention may further include the following steps:

Step 1: The MTC terminal acquires a retransmission resource, where the retransmission resource is used to retransmit the uplink data whose number of ACKs is not the preset number of times, or the received ARQ feedback result is the uplink data of the NACK;

Step 2: Retransmit the HARQ feedback result as the ACK on the acquired retransmission resource, and the uplink data of the preset number of times is not reached or the received ARQ feedback result is the uplink data of the NACK.

The MTC terminal can obtain the retransmission resource by using any of the following methods:

1) The MTC terminal receives the retransmission resource sent by the network side, where the retransmission resource is allocated by the C-RNTI allocated by the MTC terminal to the MTC terminal when the MTC terminal is in the connected state;

2) The MTC terminal determines, when the random access is sent to the network side, the used transmission resource is used as the retransmission resource;

3) The MTC terminal determines to end the current idle state transmission mode, and when the connection state is re-entered, the uplink transmission resource allocated by the network side for itself is used as the retransmission resource.

Embodiment 4

The fourth embodiment is a data transmission device corresponding to the third embodiment. As shown in FIG. 5, the structure of the data transmission device provided in the fourth embodiment includes:

The sending unit 501 is configured to send a data transmission request to the network side when the terminal device is in an idle state;

The receiving unit 502 is configured to receive a feedback message sent by the network side. The transmitting unit 503 is configured to retransmit the transmitted uplink data according to the feedback message received by the receiving unit 502.

The feedback message received by the receiving unit 502 carries the number of data retransmissions, or carries the first maximum retransmission number of the HARQ, or the first maximum retransmission number carrying the HARQ and the received HARQ feedback result are confirmed. The number of times of ACK signaling; or the second maximum number of retransmissions with HARQ and the time-frequency resource location information used by the ARQ feedback corresponding to each uplink data transmission.

Based on the information carried in the feedback message received by the receiving unit 502, the transmitting unit 503 may be configured to: when the feedback message carries the number of data retransmissions, after transmitting the uplink data for the first time, the transmission resource used for the first transmission of the uplink data is heavy. The uplink data is transmitted until the number of retransmissions reaches the number of retransmissions. If the feedback message carries the first maximum number of retransmissions of the HARQ, the uplink data is retransmitted at the retransmission time until the number of retransmissions reaches The first maximum number of retransmissions of the HARQ; if the feedback message carries the first maximum retransmission number of the HARQ and the received HARQ feedback result is the number of ACK signaling, the retransmitted uplink data is retransmitted at the retransmission time until If the number of retransmissions reaches the first maximum number of retransmissions of the HARQ or the number of received HARQ feedbacks is ACK, the number of times of the ACK reaches a preset number of times; if the feedback message carries the second maximum number of retransmissions of the HARQ and corresponding to each uplink data transmission When the time-frequency resource location information used by the ARQ feedback is used, the transmitted uplink data is retransmitted at the retransmission time until the retransmission is repeated. Reaches the second maximum number of retransmissions of HARQ; receiving unit 502, may also be used in a time-frequency resource allocation information of the time-frequency resource corresponding to the position on the network side sends the uplink data has been transmitted ARQ feedback results.

In a specific implementation, the data transmission apparatus provided by the embodiment of the present invention may further include an acquiring unit, where:

The obtaining unit may be configured to: when the received HARQ feedback result is ACK times that the number of ACKs does not reach the preset number of times, or the received ARQ feedback result is a NACK, the retransmission resource is used to retransmit the HARQ feedback result. The number of times the ACK has not reached the preset number of uplink data Or the received ARQ feedback result is the uplink data of the NACK;

The transmitting unit 503 is further configured to retransmit the uplink data that the HARQ feedback result is ACK less than the preset number of times or the received ARQ feedback result is NACK on the retransmission resource.

Preferably, the obtaining unit may be configured to receive a retransmission resource sent by the network side, where the retransmission resource is allocated by the network side to the C-RNTI allocated by the MTC terminal when it is in the connected state; or the acquiring unit may be used to determine When the terminal device initiates the random access to send the RRC connection request to the network side, the used transmission resource is used as the retransmission resource; or is specifically used to determine that the data transmission device may be set in the terminal device when the terminal device re-enters the connection implementation. .

Embodiment 5

As shown in FIG. 6, a schematic structural diagram of a data transmission system according to an embodiment of the present invention includes a base station device 601 and a terminal device 602, where the base station device 601 includes the data transmission device according to the second embodiment, and the terminal device 602 includes an implementation. The data transmission device of the fourth embodiment.

Those skilled in the art will appreciate that embodiments of the present invention can be provided as a method, apparatus, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment, or a combination of software and hardware. Moreover, the invention can be applied to one Or in the form of a computer program product embodied on a computer usable storage medium (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer usable program code.

The present invention has been described with reference to flowchart illustrations and/or block diagrams of a method, apparatus, apparatus (system), and computer program product according to embodiments of the invention. It will be understood that each flow and/or block of the flowchart illustrations and/or FIG. These computer program instructions can be provided to a processor of a general purpose computer, a special purpose computer, an embedded processor, or other programmable data processing device to produce a machine for generating instructions for execution by a processor of a computer or other programmable data processing device. Means for implementing the functions specified in one or more of the flow or in a block or blocks of the flow chart.

The computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing device to operate in a particular manner, such that the instructions stored in the computer readable memory produce an article of manufacture comprising the instruction device. The apparatus implements the functions specified in one or more blocks of a flow or a flow and/or block diagram of the flowchart.

These computer program instructions can also be loaded onto a computer or other programmable data processing device such that a series of operational steps are performed on a computer or other programmable device to produce computer-implemented processing for execution on a computer or other programmable device. The instructions provide steps for implementing the functions specified in one or more of the flow or in a block or blocks of a flow diagram.

Although the preferred embodiment of the invention has been described, it will be apparent to those skilled in the < Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and the modifications and modifications The spirit and scope of the invention. Thus, it is intended that the present invention cover the modifications and variations of the inventions

Claims

Rights request

1. A data transmission method, characterized by including:

Receive machine type communication data transmission request sent by MTC terminal in idle state;

Obtain the service type of the service used by the MTC terminal;

Select the data retransmission method according to the service type;

The transmitted downlink data is retransmitted according to the selected data retransmission method.

2. The method of claim 1, wherein the data retransmission method is a physical layer multiple transmission method, or a hybrid automatic repeat request HARQ method, or a HARQ combined with automatic repeat request ARQ method; and

The method also includes:

Return a feedback message of the data transmission request to the MTC terminal, where,

If the data retransmission method is the physical layer multiple transmission method, the number of data retransmissions is carried in the feedback message;

If the data retransmission mode is the HARQ mode, the feedback message carries the first maximum number of HARQ retransmissions or carries the first maximum number of HARQ retransmissions and the received HARQ feedback result is acknowledgment ACK signaling. times;

If the retransmission mode is HARQ combined with automatic repeat request ARQ mode, the feedback message carries the second maximum number of HARQ retransmissions and the time-frequency resource location information used by ARQ feedback corresponding to each downlink data transmission.

3. The method of claim 2, characterized in that,

If the feedback message carries the number of data retransmissions, then the transmitted downlink data is retransmitted according to the determined data retransmission method, which specifically includes:

After the downlink data is transmitted for the first time, the transmitted downlink data is retransmitted on the transmission resources used for the first transmission of the downlink data until the number of retransmissions reaches the stated number of data retransmissions;

If the feedback message carries the first maximum number of retransmissions of HARQ, then the The data retransmission method is used to retransmit the transmitted downlink data, including:

Retransmit the transmitted downlink data at the retransmission moment until the number of retransmissions reaches the first maximum number of retransmissions of HARQ;

If the feedback message carries the first maximum number of HARQ retransmissions and the number of times the received HARQ feedback result is ACK signaling, then the transmitted downlink data is retransmitted according to the determined data retransmission method. , specifically including:

Retransmit the transmitted downlink data at the retransmission moment until the number of retransmissions reaches the first maximum number of HARQ retransmissions or the number of HARQ feedback results received as ACK reaches the preset number;

If the feedback message carries the second maximum number of retransmissions of HARQ and the time-frequency resource location information used by ARQ feedback corresponding to each downlink data transmission, then the transmitted downlink data will be processed according to the determined data retransmission method. The data is retransmitted, including:

Retransmitting the transmitted downlink data at the retransmission moment until the number of retransmissions reaches the second maximum number of retransmissions of HARQ; and further including: receiving an ARQ feedback result of the transmitted downlink data sent by the MTC terminal, the ARQ feedback result It is sent by the MTC terminal at the time-frequency resource position corresponding to the time-frequency resource position information.

4. The method of claim 3, wherein if the number of times the received HARQ feedback result is ACK does not reach the preset number, or when the received ARQ feedback result is NACK, it also includes:

Determine retransmission resources, which are used to retransmit downlink data whose HARQ feedback result is ACK less than the preset number of times or for which the received ARQ feedback result is NACK; on the determined retransmission resource; The number of times of retransmitting the HARQ feedback result as ACK does not reach the preset number of downlink data or the received downlink data as the ARQ feedback result is NACK.

5. The method of claim 4, wherein determining retransmission resources specifically includes: using the cell radio network temporary identity C-RNTI allocated to the MTC terminal in the connected state, and allocating the resource to the MTC terminal. Resend the resource; or Determine that when the MTC terminal initiates random access, feed back the transmission resources used in the Radio Resource Control RRC connection request as retransmission resources; or

It is determined that when the MTC terminal re-enters the connected state, the downlink transmission resources allocated to the MTC terminal are used as retransmission resources.

6. The method of claim 1, wherein said obtaining the service type of the service used by the MTC terminal specifically includes: obtaining the service type of the service used by the MTC terminal from the core network; or when the When the data transmission request carries the service type of the service used by the MTC, obtaining the service type of the service used by the MTC terminal specifically includes: obtaining the service used by the MTC terminal from the data transmission request. business type.

7. A data transmission device, characterized by including:

The receiving unit is used to receive the data transmission request sent by the machine type communication MTC terminal in the idle state;

Obtaining unit, used to obtain the service type of the service used by the MTC terminal;

The selection unit is used to select a data retransmission mode according to the service type obtained by the acquisition unit; the transmission unit is used to retransmit the transmitted downlink data according to the selected data retransmission mode.

8. The device according to claim 7, wherein the data retransmission method is a physical layer multiple transmission method or a hybrid automatic repeat request HARQ method or a HARQ combined automatic repeat request ARQ method; and

The device also includes:

A sending unit, configured to return a feedback message of the data transmission request to the MTC terminal, where, if the data retransmission mode is the physical layer multiple transmission mode, the feedback message carries the number of data retransmissions; if the data When the retransmission mode is the HARQ mode, the feedback message carries the first maximum number of HARQ retransmissions or the feedback message carries the first maximum number of HARQ retransmissions and the received HARQ feedback result is an acknowledgment ACK message. The number of commands; If the data retransmission mode is HARQ mode combined with ARQ mode, the feedback message carries the second maximum number of HARQ retransmissions and each The time-frequency resource location information used by ARQ feedback corresponding to data transmission.

9. The device according to claim 8, characterized in that,

The transmission unit is specifically configured to, if the feedback message carries the number of data retransmissions, retransmit the transmitted downlink data on the transmission resources used for the first transmission of downlink data after the first transmission of downlink data until the number of retransmissions. The number of data retransmissions is reached; or

Specifically used to retransmit the transmitted downlink data at the retransmission moment when the feedback message carries the first maximum number of HARQ retransmissions until the number of retransmissions reaches the first maximum number of HARQ retransmissions; or specifically used if When the feedback message carries the first maximum number of HARQ retransmissions and the number of times the received HARQ feedback result is ACK signaling, the transmitted downlink data is retransmitted at the retransmission time until the number of retransmissions reaches the first maximum number of HARQ retransmissions. The number of transmissions or the number of times the received HARQ feedback result is ACK reaches the preset number; or

Specifically, if the feedback message carries the second maximum number of retransmissions of HARQ and the time-frequency resource location information used by ARQ feedback corresponding to each downlink data transmission, the transmitted downlink data will be retransmitted at the retransmission time until The number of retransmissions reaches the second maximum number of retransmissions of HARQ;

The receiving unit is also configured to receive an ARQ feedback result of transmitted downlink data sent by the MTC terminal, where the ARQ feedback result is sent by the MTC terminal at a time-frequency resource position corresponding to the time-frequency resource position information. of.

10. The apparatus according to claim 9, further comprising a determining unit, wherein: the determining unit is configured to determine when the number of times the received HARQ feedback result is ACK does not reach a preset number, or the number of received HARQ feedback results is ACK. When the ARQ feedback result is NACK, determine the retransmission resources used to retransmit downlink data whose number of times the HARQ feedback result is ACK has not reached the preset number of times or for which the received ARQ feedback result is NACK;

The transmission unit is also configured to retransmit on the determined retransmission resource the downlink data whose HARQ feedback result is ACK less than the preset number of times or the received downlink data whose ARQ feedback result is NACK.

11. The device according to claim 10, characterized in that,

The determining unit is specifically configured to use the cell radio network temporary identity C-RNTI assigned to the MTC terminal in the connected state to allocate retransmission resources to the MTC terminal; or specifically configured to determine whether the MTC terminal initiates During random access, the transmission resources used by the Radio Resource Control RRC connection request are fed back as retransmission resources; or specifically used to determine when the MTC terminal re-enters the connected state, the transmission resources allocated to the MTC terminal are used as retransmission resources. resource.

12. The device according to claim 7, wherein the obtaining unit is specifically configured to obtain the service type of the service used by the MTC terminal from the core network; or is specifically configured to carry it in the data transmission request. If there is a service type of the service used by the MTC, the service type of the service used by the MTC terminal is obtained from the data transmission request.

13. A base station equipment, characterized in that it includes the device described in any one of claims 7-12.

14. A data transmission method, characterized by including:

In the idle state, send a data transmission request to the network side; and

Receive feedback messages sent by the network side;

The transmitted uplink data is retransmitted according to the feedback message.

15. The method of claim 14, wherein the feedback message carries the number of data retransmissions or the feedback message carries the first maximum number of HARQ retransmissions, or the feedback message carries There is the first maximum number of HARQ retransmissions and the number of times the received HARQ feedback result is the confirmation ACK signaling, or the feedback message carries the second maximum number of HARQ retransmissions and the number of times the HARQ feedback result has been confirmed according to the feedback message. Transmitting the uplink data for retransmission specifically includes: If the feedback message carries the number of data retransmissions, after the first transmission of the uplink data, the transmitted uplink data is retransmitted on the transmission resource used for the first transmission of the uplink data until the retransmission. The number of transmissions reaches the stated number of data retransmissions; If the feedback message carries the first maximum number of HARQ retransmissions, the transmitted uplink data is retransmitted at the retransmission moment until the number of retransmissions reaches the first maximum number of HARQ retransmissions;

If the feedback message carries the first maximum number of HARQ retransmissions and the received HARQ feedback result is the number of acknowledgment ACK signaling, the transmitted uplink data is retransmitted at the retransmission time until the number of retransmissions reaches the HARQ number. The first maximum number of retransmissions or the number of times the received HARQ feedback result is ACK reaches the preset number;

If the feedback message carries the second maximum number of retransmissions of HARQ and the time-frequency resource location information used by ARQ feedback corresponding to each uplink data transmission, the transmitted uplink data will be retransmitted at the retransmission time until the number of retransmissions. Reaching the second maximum number of retransmissions of HARQ; and further comprising: receiving an ARQ feedback result sent by the network side at a time-frequency resource position corresponding to the time-frequency resource position information.

16. The method of claim 15, wherein if the number of times the received HARQ feedback result is ACK does not reach the preset number of times, or when the received ARQ feedback result is NACK, it also includes:

Obtain retransmission resources, which are used to retransmit uplink data whose HARQ feedback result is ACK less than a preset number of times or whose received ARQ feedback result is NACK; retransmit on the retransmission resource The number of times of sending the HARQ feedback result as ACK has not reached the preset number of uplink data or the received uplink data as the ARQ feedback result is NACK.

17. The method of claim 16, wherein the obtaining retransmission resources specifically includes:

Receive retransmission resources sent by the network side, where the retransmission resources are allocated by the cell radio network temporary identifier C-RNTI allocated when the network side uses the connected state; or

Determine the transmission resources used as retransmission resources when initiating random access and sending an RRC connection request to the network side; or

It is determined that when re-entering the connected state, the uplink transmission resources allocated by the network side are used as retransmission resources.

18. A data transmission device, characterized in that it includes: The sending unit is used to send a data transmission request to the network side when the terminal device is in an idle state; the receiving unit is used to receive the feedback message sent by the network side;

A transmission unit, configured to retransmit the transmitted uplink data according to the feedback message.

19. The apparatus according to claim 18, wherein the feedback message carries the number of data retransmissions, or the feedback message carries the first maximum number of HARQ retransmissions, or the feedback message carries the number of data retransmissions. The transmission unit carries the first maximum number of HARQ retransmissions and the received HARQ feedback result is the number of acknowledgment ACK signaling; or the feedback message carries the second maximum number of HARQ retransmissions, specifically used if When the feedback message carries the number of data retransmissions, after the first transmission of the uplink data, the transmitted uplink data is retransmitted on the transmission resource used for the first transmission of the uplink data until the number of retransmissions reaches the stated number of data retransmissions; or

Specifically used when the feedback message carries the first maximum number of HARQ retransmissions, retransmit the transmitted uplink data at the retransmission moment until the number of retransmissions reaches the first maximum number of HARQ retransmissions; or

Specifically used to retransmit the transmitted uplink data at the retransmission moment until the number of retransmissions reaches The first maximum number of HARQ retransmissions or the number of times the received HARQ feedback result is ACK reaches the preset number; or

Specifically used when the feedback message carries the second maximum number of retransmissions of HARQ and the time-frequency resource location information used by ARQ feedback corresponding to each uplink data transmission, the transmitted uplink data is retransmitted at the retransmission time until The number of retransmissions reaches the second maximum number of retransmissions of HARQ; and the receiving unit is further configured to receive the ARQ feedback result of the transmitted uplink data sent by the network side at the time-frequency resource position corresponding to the time-frequency resource position information. .

20. The device of claim 19, further comprising an acquisition unit, wherein: the acquisition unit is configured to: if the number of times the received HARQ feedback result is ACK does not reach the preset number, Or when the received ARQ feedback result is NACK, retransmission resources are obtained. The retransmission resources are used to retransmit the uplink data for which the number of HARQ feedback results as ACKs has not reached the preset number or the received ARQ feedback result is NACK. Uplink data;

The transmission unit is also configured to retransmit on the retransmission resource the uplink data whose HARQ feedback result is ACK for less than a preset number of times or the received uplink data whose ARQ feedback result is NACK.

21. The device according to claim 20, characterized in that,

The acquisition unit is specifically configured to receive retransmission resources sent by the network side, where the retransmission resources are allocated by the cell radio network temporary identifier C-RNTI allocated when the network side uses the connected state; or specifically used to determine the time when the network side uses the connected state. When the terminal device initiates random access and sends an RRC connection request to the network side, the transmission resources used are used as retransmission resources; or specifically used to determine when the terminal device re-enters the connection state.

22. A terminal device, characterized by comprising the device described in any one of claims 18-21.

23. A data transmission system, characterized in that it includes base station equipment and terminal equipment, wherein the base station equipment includes the device according to any one of claims 7-12, and the terminal equipment includes the device according to any one of claims 18-21 A device as claimed in any one of the claims.