WO2013040962A1

WO2013040962A1 - Data sending and receiving method and device

Info

Publication number: WO2013040962A1
Application number: PCT/CN2012/080011
Authority: WO
Inventors: 康艳超; 艾明; 王胡成
Original assignee: 电信科学技术研究院
Priority date: 2011-09-23
Filing date: 2012-08-13
Publication date: 2013-03-28
Also published as: CN102340754A; CN102340754B

Abstract

The present invention relates to the technical field of radio communications. Disclosed are a data sending and receiving method and device, which are used for saving radio air interface resources and node signaling resources of a system. In the application, a core network device receives small data to be sent to a terminal in an idle state, and sends a paging message carrying small data indication information to the terminal; after receiving the paging message carrying the small data indication information, the terminal does not initiate a service request process, but responds to the paging message through an uplink non-access stratum (NAS) message; and after receiving the uplink NAS message, the core network device sends the small data to the terminal through a downlink NAS message. This application can be adopted to save the system resources.

Description

The present invention claims the priority of a Chinese patent application filed on September 23, 2011, the Chinese Patent Office, Application No. 201110285738.3, entitled "Data Transmission and Receiving Method and Apparatus", the entire contents of which is hereby incorporated by reference. This is incorporated herein by reference. The present invention relates to the field of wireless communication technologies, and in particular, to a data transmission and reception method and device. BACKGROUND OF THE INVENTION Research on Machine to Machine (M2M) communication has shown potential market prospects for providing M2M communication over mobile networks. The M2M service puts forward a lot of new requirements for the system. Small data transmission is one of the important requirements. To this end, SA1 puts forward the following requirements in the protocol TS22.368:

The characteristics of small data transmission apply to machine type communication (MTC) devices that send or receive small amounts of data. Data transmission has the following characteristics:

First, systems that support small amounts of data transmission should have minimal impact on the network (eg, signaling overhead, network resources, latency of reconfiguration).

Second, when the MTC device needs to send a small amount of data, it can be attached to the network or detached from the network. Third, the definition of small amounts of data should be configurable based on contract information or operator policies.

The existing schemes for downlink small data transmission mainly include the following two types:

The first type uses the established Non-Access Stratum (NAS) security context to transmit the Down Short Message Service (SMS) Protocol Data Unit (PDU), which uses NAS signaling to transmit data. There is no need to establish a Radio Resource Control (RRC) security context. The specific process is:

Step 1: The Mobility Management Entity (MME) and the User Terminal (UE) perform small data transmission negotiation in the Attach/Tracking Area Update (TAU) process.

Step 2: The downlink short message arrives at the MME, and the MME sends a paging message to the UE, and after receiving the paging message, the UE establishes a Radio Resource Control (RRC) connection with the base station (e B );

The paging message on the air interface and the SI interface carries a small data flag, so that the UE changes the RRC establishment cause value from the called access (mt-access) to the calling party. Mo-signalling or a new cause value (such as called signaling mt-signalling). This RRC establishment cause allows the eNB to optimize its resource allocation and configure the UE to not perform measurement reporting.

Step 3: The UE sends a Service Request message to the MME in response to the paging, and in the message. Carrying a Key Set Identifier (KSI) and a sequence number information element (IE). The MME may encrypt the subsequently transmitted short message data (RP-data) using the KSI and sequence number, and the Evolved Packet System (EPS) System Temporary Mobile Subscriber Identity (S-TMSI).

Step 4: The MME carries the RP-data in the encrypted IE of the NAS protocol data unit (PDU) of the downlink NAS transmission message, and sends the downlink NAS transmission message to the e B. e B sends the NAS PDU to the UE.

Step 5: The UE carries a short message response (RP-ACK) in the encrypted IE of the NAS PDU in the UL Information Transfer message, and transmits the uplink information transmission to the eNB, and then the eNB sends the NAS PDU to step 6. The UE adds a new optional IE in the uplink information transmission UL Information Transfer to request the eNB to release the RRC connection.

Step 7: The eNB releases the RRC connection.

Second, the established NAS security context is used to transmit downlink small data IP packets. This method uses NAS signaling to transmit data without establishing an RRC security context. As shown in Figure 1, the specific process is:

Step 1: The MME and the UE perform small data transmission negotiation, activate NAS encryption, and activate a packet data network (PDN) connection.

Step 2: When a downlink IP packet arrives at the Serving GW (S-GW), if the downlink IP packet carries small data, the S-GW buffers the IP packet and carries the IP packet in the downlink data notification (Downlink Data) Notification ) The message is passed to the MME.

Step 3: The MME performs paging;

Specifically, the MME adds an SMS data flag to the paging message on the air interface and the S1 interface, to allow the UE to change the RRC establishment cause from mt-access to mo-signalling or a new cause value (ratio: 3⁄4 port) Mt-signalling). The RRC establishment cause allows the eNB to optimize its resource allocation and configure the UE not to perform measurements.

In this step, the MME may determine whether to use the small data transmission feature according to the subscription information before the SMS data flag is added to the paging message, and if yes, add the SMS data flag to the sent paging message, otherwise, The SMS data flag is added, and the Service Request process is executed, and the user plane connection with the UE established through the process is subsequently sent to the UE.

Step 4: After receiving the paging message carrying the SMS data flag, the UE sends a service request message to the MME to respond to the paging, and carries the KSI and sequence number IE in the message. The MME can use the KSI and sequence number and S-TMSI to encrypt the IP packets transmitted below.

Step 5: The MME carries the IP packet and the EPS bearer ID in the encrypted IE of the NAS PDU that transmits the NAS message on the SI interface, and sends the downlink NAS transport message to the eNB, and the eNB sends the NAS PDU to the UE.

Step 6: Usually the UE sends an IP packet as a response. Specifically, the UE carries the IP packet and the EPS bearer ID in the encrypted IE of the NAS PDU in the UL Information Transfer message, and sends the UL Information Transfer message to the eNB. The eNB then sends the NAS PDU to the MME. The MME decrypts the IE, adds the GPRS Tunneling Protocol (GTP) header, and sends it to step 7: The UE adds a new optional IE to the UL Information Transfer to request the eNB to release the RRC connection. Step 8: The eNB releases the RRC connection.

In step 2, the S-GW further detects whether there is an IP packet to the same UE next, and whether the total size of the IP packets exceeds a threshold configured by the operator or the subscription information, and if so, the S-GW to the MME The downlink data is sent to notify the Downlink Data Notification request to establish the SI bearer, and the IP packets are sent to the UE through the established SI bearer; if not, the IP packets are sent to the UE according to Step 2 - Step 6.

The service request process initiated by the UE is shown in Figure 2. The paging process in the SAE system and the service request process triggered by it are shown in Figure 3.

The end-to-end communication between the MTC device and the MTC application can utilize the services provided by the 3GPP. The 3GPP system provides transport and communication services, including 3GPP bearer services, IP Multimedia System (IMS), and SMS, and is optimized for MTC communications. The MTC architecture reference model is shown in Figure 4.

The UE can connect to the 3GPP network through a Um/Uu/LTE-Uu interface, such as a UMTS Terrestrial Radio Access Network (UTRAN), an evolved UTRAN (E-UTRAN GSM/EDGE Radio Access Network (GSM/) EDGE Radio Access Network (GERAN), wireless local area network and 3GPP network interworking system (I-WLAN), etc. The following three models of MTC communication are covered in the architecture diagram:

Direct model: Direct communication provided by the 3GPP operator. The MTC application does not pass through the MTC server but directly connects to the carrier network.

Indirect model - Communication controlled by the MTC service provider: The MTC server is an entity outside the carrier's domain, and MTCi, MTCsp and MTCsms are external interfaces.

Indirect model 3GPP operator controlled communication: The MTC server is located in the carrier network, and MTCi, MTCsp and MTCsms are internal interfaces of the Public Land Mobile Network (PLMN).

Hybrid model: The hybrid model includes the direct model and the indirect model. The user plane is established by the direct model, and the control plane signaling is transmitted by the indirect model.

To support the indirect model and hybrid model of MTC communication, one or more MTC-InterWorking Functions (MTC-IWF) need to be configured in the PLMN. The MTC-IWF can be a separate entity or a functional entity on another network element. The MTC-IWF is located on the internal topology of the PLMN and transmits signaling between the 3GPP network and the MTC server through the MTCsp interface.

The functions of the MTC-IWF include: providing an MTCsp reference point; authenticating the MTC server before establishing signaling to the 3GPP network; authorizing the control plane communication request of the MTC server; supporting between the 3GPP network and the MTC server Secure communication.

In the process of implementing the present invention, the inventors have found that the following technical problems exist in the prior art:

For the downlink small data transmission in the idle state, the existing two types of schemes need to trigger the MME to page the UE, and use the service request process initiated by the UE to respond to the paging to complete the transmission of the downlink small data. The service request process establishes the data radio bearer (DRB) and the S1-U bearer. When a large number of MTC devices need to perform small data communication, it will undoubtedly impose a great burden on the wireless air interface resources and the node signaling resources. SUMMARY OF THE INVENTION Embodiments of the present invention provide a data transmission and reception method and device, which are used to save wireless air interface resources and node signaling resources of a system.

A data transmission method, the method comprising:

After receiving the small data that needs to be sent to the terminal in the idle state, the core network device sends a paging message carrying the small data indication information to the terminal; the small data is that the data volume is less than a preset data volume threshold. Data

After receiving the uplink non-access stratum NAS message sent by the terminal and responding to the paging message, the core network device sends the small data to the terminal by using a downlink NAS message.

A data receiving method, the method comprising:

The terminal in the idle state receives the paging message sent by the core network device, where the paging message carries the small data indication information; the terminal sends the uplink non-access stratum NAS message in response to the paging message to the core network device; The terminal receives small data that is sent by the core network device by using a downlink NAS message; and the small data is data whose data volume is smaller than a preset data volume threshold.

A data transmitting device, the device comprising:

a data receiving unit, configured to receive small data that needs to be sent to a terminal in an idle state; the small data is data whose data amount is smaller than a preset data amount threshold;

a paging sending unit, configured to send, to the terminal, a paging message that carries small data indication information;

And a data transmission unit, configured to send the small data to the terminal by using a downlink NAS message after receiving the uplink non-access stratum NAS message sent by the terminal and responding to the paging message.

A data receiving device, the device comprising:

a paging receiving unit, configured to receive a paging message sent by the core network device when in an idle state, where the paging message carries small data indication information;

a paging response unit, configured to send, to the core network device, an uplink non-access stratum NAS message that is responsive to the paging message;

a data receiving unit, configured to receive small data that is sent by the core network device by using a downlink NAS message; According to the data whose data amount is smaller than the preset data amount threshold.

A mobility management entity MME, the MME comprising the data transmitting device.

A service GPRS support node SGSN, the SGSN comprising the data transmitting device.

A machine communication MTC terminal, the terminal comprising the data receiving device.

After receiving the small data that needs to be sent to the terminal in the idle state, the core network device sends a paging message carrying the small data indication information to the terminal; after receiving the paging message carrying the small data indication information, the terminal does not initiate the service. The request process is to respond to the paging message by using the uplink NAS message. After receiving the uplink NAS message, the core network device sends the small data to the terminal through the downlink NAS message. In this solution, since the terminal does not need to initiate the service request process after receiving the paging message, the DRB establishment of the air interface of the service request process and the operation of establishing the S1-U bearer are avoided, thereby saving the wireless air interface resource and the node signaling. Resources. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic diagram of end-to-end '』, data transmission in the prior art;

2 is a schematic diagram of a service request process initiated by a UE in the prior art;

3 is a schematic diagram of a paging process and a triggered service request process in the prior art;

4 is a schematic diagram of a reference model of an MTC architecture in a 3GPP system in the prior art;

FIG. 5 is a schematic flowchart of a method according to an embodiment of the present disclosure;

FIG. 6 is a schematic flowchart of another method according to an embodiment of the present disclosure;

7A is a schematic diagram of a downlink small data transmission path according to an embodiment of the present invention;

7B is a schematic diagram of another downlink small data transmission path according to an embodiment of the present invention;

7C is a schematic flowchart of Embodiment 1 of the present invention;

7D is a schematic flowchart of Embodiment 2 of the present invention;

FIG. 8 is a schematic structural diagram of a system according to an embodiment of the present disclosure;

FIG. 9 is a schematic structural diagram of a device according to an embodiment of the present invention;

FIG. 10 is a schematic structural diagram of another device according to an embodiment of the present invention. The embodiment of the present invention provides a data sending and receiving method. In this method, after receiving the small data that needs to be sent to the idle state terminal, the core network device sends the carrying small data to the terminal. The paging message indicating the information; after receiving the paging message carrying the small data indication information, the terminal does not initiate the service request process, but responds to the paging message by using the uplink NAS message, and the core network device receives the uplink NAS message and passes the The downlink NAS message sends small data to the terminal. Referring to FIG. 5, a data sending method provided by an embodiment of the present invention includes the following steps:

Step 50: The core network device receives data that needs to be sent to the terminal in the idle state, and the small data is data volume and data of a preset data volume threshold value;

Step 51: The core network device sends a paging message carrying the data indication information to the terminal.

Step 52: After receiving the uplink non-access stratum (NAS) message sent by the terminal and responding to the paging message, the core network device sends the small data to the terminal by using the downlink NAS message.

In step 50, the core network device can receive small data from a Machine Communication Interconnect Server (MTC-IWF) or a Serving Gateway (S-GW) or a Gateway GPRS Support Node (GGSN). For example, when the core network device is the MME, the MME may receive small data from the S-GW or the MTC-IWF; when the core network device is the SGSN, the SGSN may receive small data from the GGSN or the MTC-IWF.

In step 52, the uplink NAS message may be a newly defined uplink NAS message; the downlink NAS message is a newly defined downlink NAS message. For example, the newly defined uplink NAS message may be an SMD (small data) request message or the like; the newly defined downlink NAS message may be an SMD response message or the like.

In step 52, the uplink NAS message may also be an extended existing NAS message; the downlink NAS message may be an extended existing downlink NAS message. For example, the extended existing uplink NAS message may be a Tracking Area Update (TAU)/Routing Area Update (RAU) request message carrying small data indication information, etc.; the extended existing downlink NAS message may be accepted by TAU/RAU. Messages, etc. For example, when the extended existing uplink NAS message is a TAU request message, the extended existing downlink NAS message is a TAU accept message; when the extended existing uplink NAS message is a RAU request message, the extended existing message The downlink NAS message is a RAU accept message.

Preferably, after the small data is sent to the terminal by using the downlink NAS message, if the core network device receives the small data reception confirmation message sent by the terminal, and determines that the small data transmission succeeds according to the small data reception confirmation message, Send '〗, data transmission success confirmation message to the trigger device;

The core network device receives the small data reception confirmation message sent by the terminal, and determines that the small data transmission fails according to the small data reception confirmation message, or does not receive the small transmission sent by the terminal before the timer that is started after sending the small data to the terminal expires. After receiving the data confirmation message, the data is retransmitted to the terminal, and after the retransmission is successful, the small data transmission success confirmation information is sent to the triggering device, and after the retransmission fails, the small data transmission failure confirmation information is sent to the triggering device. The triggering device here is the device that sends the small data received by the core network device in step 50, and may be an MTC-IWF or an S-GW or a GGSN. For example, when the core network device is the MME, the triggering device may be the S-GW. Or MTC-IWF; When the core network device is an SGSN, the trigger device may be a GGSN or an MTC-IWF.

Preferably, after the small network transmission success confirmation information or the small data transmission failure confirmation information is sent to the trigger device, the core network device determines that no subsequent small data arrives, and notifies the access network device to release the wireless resource control connection with the terminal. ( RRC connection ).

In the method, the core network device may be a mobility management entity (MME) or a serving GPRS support node (SGSN). If the core network device is the MME, the access network device is the base station; if the core network device is the SGSN, the access network device is the radio network controller (RNC) or the base station controller (BSC).

Referring to FIG. 6, the data receiving method provided by the embodiment of the present invention includes the following steps:

Step 60: The terminal in the idle state receives the paging message sent by the core network device, where the paging message carries the small data indication information.

Step 61: The terminal sends an uplink NAS message that responds to the paging message to the core network device.

Step 62: The terminal receives small data sent by the core network device by using a downlink NAS message, where the small data is data whose data volume is less than a preset data volume threshold.

The uplink NAS message in step 61 may be a newly defined uplink NAS message, and the downlink NAS message in step 62 may be a newly defined downlink NAS message. For example, the newly defined uplink NAS message may be an SMD request message or the like; the newly defined downlink NAS message may be an SMD response message or the like.

The uplink NAS message in step 61 may also be an extended existing NAS message, and the downlink NAS message in step 62 may be an extended existing downlink NAS message. For example, the extended existing NAS message may be a TAU/RAU request message carrying small data indication information, etc.; the extended existing downlink NAS message may be a TAU/RAU accept message or the like.

Preferably, after the terminal receives the small data sent by the core network device by using the downlink NAS message, the terminal may send a small data receiving confirmation message to the core network device to notify the core network device whether the small data is successfully received.

Preferably, the terminal can establish an RRC connection with the access network device before the terminal sends the uplink NAS message to the core network device after receiving the paging message; then, the RRC can be established between the core network device and the terminal. The connection is used for message interaction. Specifically, in step 61, the terminal sends an uplink NAS message that responds to the paging message to the access network device by using the established RRC connection, to notify the access network device to forward the uplink NAS message to the core network. The device receives the downlink NAS message from the core network device that is forwarded by the access network device through the RRC connection, and the downlink NAS message carries the small data.

In this method, the core network device may be an MME or an SGSN. If the core network device is the MME, the access network device is the base station; if the core network device is the SGSN, the access network device is the RNC or the BSC.

The invention will be specifically described below:

The main idea of the solution is as follows: The core network device carries the small data indication information in the paging message. After receiving the paging message carrying the small data indication information, the UE does not initiate the service request process for establishing the user plane bearer. Instead, the transmission and confirmation of the downlink small data is completed through the newly defined NAS message or the extended existing NAS message.

As shown in Figure 7A, the specific message process in the LTE system is as follows:

After receiving the small data that needs to be sent to the UE, the MME sends a paging message carrying the small data indication information to the e B; e B sends a paging message carrying the data indication information to the UE;

After receiving the paging message carrying the small data indication information, the UE sends an uplink (UL) NAS message in response to the paging message to the MME, where the UL NAS message or the newly defined UL NAS message or the extended existing UL NAS message ;

After receiving the UL NAS message, the MME does not send the initial UE context setup message to request the eNB to establish the user plane bearer, but sends the small data to the UE through the downlink (DL) NAS message, the DL NAS message. A newly defined DL NAS message or an extended existing DL NAS message.

The subsequent UE can confirm to the MME whether the small data reception is successful through a corresponding acknowledgement message. After receiving the acknowledgement message, the MME notifies the eNB to release the RRC connection if no subsequent small data arrives.

The method describes how the MME transmits small data to the UE after receiving the downlink small data. There is no application restriction on the transmission path of the small data in the core network. The two typical transmission paths are as follows:

MTC server^P-GW^S-GW^MME;

MTC server MTC-IWF MME.

As shown in Figure 7B, the specific message process in the 3G system is as follows:

After receiving the small data that needs to be sent to the UE, the SGSN sends a paging message carrying the small data indication information to the RNC/B SC;

The RNC/B SC sends a paging message carrying the data indication information to the UE;

After receiving the paging message carrying the small data indication information, the UE sends an uplink (UL) NAS message in response to the paging message to the SGSN, the UL NAS message or the newly defined UL NAS message or the extended existing UL NAS message. ;

After receiving the UL NAS message, the SGSN does not send the initial UE context setup message to request the eNB to establish the user plane bearer, but sends the small data to the UE through the downlink (DL) NAS message, the DL NAS message. A newly defined DL NAS message or an extended existing DL NAS message.

The subsequent UE can confirm to the SGSN whether the small data reception is successful through a corresponding confirmation message. After receiving the acknowledgement message, the SGSN notifies the eNB to release the RRC connection if no subsequent small data arrives.

The method describes how the SGSN transmits small data to the UE after receiving the downlink small data. There is no application restriction on the transmission path of the small data in the core network. The two typical transmission paths are as follows:

MTC server GGSN SGSN;

MTC server MTC-IWF SGSN.

Embodiment 1

As the interface node of the 3GPP for the MTC server, the MTC-IWF authenticates the MTC server, authorizes the establishment of the control plane communication to the MTC server, and is responsible for the small data sent by the received MTC server through the MME. The control message is passed to the serving MME node. After receiving the small data, the MME transmits the small data to the UE according to the method shown in Figure 7C:

Step 1: The MME pages the UE after receiving the small data, and the MME carries the small data in the paging message sent to the eNB. Instructions.

Step 2: The e B pages the UE according to the normal operation, and carries the small data indication information in the paging message sent to the UE. Step 3: After receiving the paging message carrying the small data indication information, the UE sends a newly defined UL NAS message, that is, an SMD request message, to the MME, in response to the paging message.

Step 4: The MME receives the SMD request message sent by the UE, and directly passes the newly defined DL NAS message.

The SMD response message brings the small data to the UE.

Step 5: The UE returns a small data reception confirmation message to the MME through the SMD complete message.

Step 6: If the MME receives the acknowledgement message and determines that the small data transmission succeeds according to the acknowledgement message,

MTC-IWF sends '〗, data transmission success confirmation message;

If the MME receives the acknowledgment message and determines that the small data transmission fails according to the acknowledgment message, or fails to receive the acknowledgment message before the timer that is started after the small data is sent to the UE, the MME retransmits the small data to the UE, and the retransmission succeeds. Backward

The MTC-IWF sends a small data transmission success confirmation message, and sends a small data transmission failure confirmation message to the MTC-IWF after the retransmission fails.

Step 7: The MME determines that no eNB arrives, and notifies the eNB to release the RRC connection.

Step 8: The MTC-IWF sends a decimal transmission confirmation message to the MTC server.

Embodiment 2

As the interface node of the 3GPP for the MTC server, the MTC-IWF authenticates the MTC server, authorizes the establishment of the control plane communication to the MTC server, and is responsible for the small data sent by the received MTC server through the MME. The control message is passed to the serving MME node. After receiving the small data, the MME transmits the small data to the UE according to the method shown in FIG. 7D:

Step 1: The MME pages the UE after receiving the small data, and the MME carries the small data indication information in the paging message sent to the eNB.

Step 2: The eNB pages the UE according to the normal operation, and carries the small data indication information in the paging message sent to the UE. Step 3: After receiving the paging message carrying the small data indication information, the UE sends a TAU request message carrying the '〗 and the data indication information to the MME to respond to the paging message.

Step 4: The MME receives the TAU request message sent by the UE, and does not perform the operation of authenticating and creating/modifying the bearer, but directly carries the small data to the UE through the TAU Accept message.

Step 5: The UE returns a small data reception confirmation message to the MME through the TAU complete message.

Step 6: If the MME receives the acknowledgement message and determines that the small data transmission is successful according to the acknowledgement message, the MME sends a message to the MTC-IWF, and the data transmission success confirmation message is sent;

If the MME receives the acknowledgment message, and determines that the small data transmission fails according to the acknowledgment message, or fails to receive the acknowledgment message before the timer that is started after the small data is sent to the UE, the MME retransmits the small data to the UE, and retransmits the data. After successful, it sends a small data transmission success confirmation message to the MTC-IWF, and sends a small data transmission loss to the MTC-IWF after the retransmission fails. Lose confirmation information.

Step 7: The MME notifies the e B to release the RRC connection when it is determined that no subsequent small data arrives. Step 8: The MTC-IWF sends the decimal transmission confirmation information to the MTC server.

Referring to FIG. 8, an embodiment of the present invention further provides a wireless communication system, where the system includes:

The core network device 80 is configured to send, after receiving the small data that needs to be sent to the terminal in the idle state, a paging message that carries the small data indication information, where the small data is a data amount smaller than a preset data amount gate. Data of the limit value; after receiving the uplink NAS message sent by the terminal and responding to the paging message, sending the small data to the terminal by using a downlink NAS message;

The terminal 81 is configured to receive, when in an idle state, a paging message sent by the core network device, where the paging message carries small data indication information, and send, to the core network device, an uplink NAS message that is responsive to the paging message; The small data that the core network device sends through the downlink NAS message.

Referring to FIG. 9, an embodiment of the present invention further provides a data sending apparatus, where the apparatus includes:

The data receiving unit 90 is configured to receive small data that needs to be sent to a terminal in an idle state, where the small data is data whose data amount is smaller than a preset data amount threshold;

a paging sending unit 91, configured to send, to the terminal, a paging message that carries small data indication information;

The data transmission unit 92 is configured to send the small data to the terminal by using a downlink NAS message after receiving the uplink non-access stratum NAS message sent by the terminal and responding to the paging message.

The uplink NAS message is: a newly defined uplink NAS message; the downlink NAS message is: a newly defined downlink NAS message; or

The uplink NAS message is: an extended existing NAS message; the downlink NAS message is: an extended existing downlink NAS message.

The newly defined uplink NAS message is: an SMD request message; the newly defined downlink NAS message is: an SMD response message.

The extended existing NAS message is: a tracking area update TAU/routing area update RAU request message carrying small data indication information; and the extended existing downlink NAS message is: TAU/RAU accept message.

The device also includes:

The transmission confirmation unit 93 is configured to: after receiving the small data reception confirmation message sent by the terminal, and according to the small data reception confirmation message, determining that the small data transmission is successful, sending the small data transmission success confirmation information to the trigger device; The small data sent by the terminal receives the acknowledgement message, and determines that the small data transmission fails according to the small data reception confirmation message, or does not receive the terminal before the timer that is started after the small data is sent to the terminal expires. When the small data receives the acknowledgement message, the small data is retransmitted to the terminal, and after the retransmission is successful, the small data transmission success confirmation information is sent to the trigger device, and after the retransmission fails, the small data transmission failure confirmation is sent to the trigger device. information; The triggering device is a device that sends small data received by the core network device.

The device also includes:

The connection release unit 94 is configured to notify the access network device to release the radio resource control connection with the terminal when no subsequent small data arrives. RRC connection

The data receiving unit 90 is configured to:

The small data is received from a machine communication interconnection server MTC-IWF or a serving gateway S-GW or GGSN.

Referring to FIG. 10, an embodiment of the present invention further provides a data receiving apparatus, where the apparatus includes:

The paging receiving unit 101 is configured to receive, when in an idle state, a paging message sent by the core network device, where the paging message carries small data indication information;

a paging response unit 102, configured to send, to the core network device, an uplink non-access stratum that responds to the paging message

NAS message;

The data receiving unit 103 is configured to receive small data that is sent by the core network device by using a downlink NAS message, where the small data is data whose data volume is less than a preset data volume threshold.

The device also includes:

The receiving confirmation unit 104 is configured to send a data receiving confirmation message to the core network device to notify the core network device whether the small data is successfully received.

The device also includes:

The connection establishing unit 105 is configured to establish a radio resource control RRC connection with the access network device after receiving the paging message and before sending the uplink NAS message to the core network device.

The paging response unit 102 is configured to:

And sending, by the RRC connection, an uplink NAS message that is sent to the access network device, to notify the access network device to forward the uplink NAS message to the core network device;

The data receiving unit 103 is configured to:

Receiving, by the access network device, a downlink NAS message that is forwarded by the RRC connection from the core network device, where the downlink NAS message carries the small data. An embodiment of the present invention further provides an MME, where the MME includes a data sending apparatus as shown in FIG.

An embodiment of the present invention further provides an SGSN, where the SGSN includes a data transmitting apparatus as shown in FIG.

An embodiment of the present invention further provides an MTC terminal, where the MTC terminal includes a data receiving apparatus as shown in FIG. In summary, the beneficial effects of the present invention include:

In the solution provided by the embodiment of the present invention, after receiving the small data that needs to be sent to the terminal in the idle state, the core network device sends a paging message carrying the small data indication information to the terminal; the terminal receives the small data indication information. After the paging message is sent, the service request process is not initiated. Instead, the uplink NAS message responds to the paging message. After receiving the uplink NAS message, the core network device sends the small data to the terminal through the downlink NAS message. In this solution, since the terminal does not need to initiate the service request process after receiving the paging message, the DRB establishment of the air interface of the service request process and the operation of establishing the S1-U bearer are avoided, thereby saving the wireless air interface resource and the node signaling. Resources.

The present invention has been described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (system), and computer program products according to embodiments of the invention. It will be understood that each process 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, special purpose computer, embedded processor, or other programmable data processing device to produce a machine for the execution of 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 of ordinary skill in the art that <RTIgt; Therefore, the appended claims are intended to be construed as including the preferred embodiments and the modifications

It is apparent that those skilled in the art can make various modifications and variations to the invention without departing from the spirit and scope of the invention. Thus, it is intended that the present invention cover the modifications and modifications of the invention

Claims

Rights request

A data transmission method, characterized in that the method comprises:

After receiving the small data that needs to be sent to the terminal in the idle state, the core network device sends a paging message carrying the small data indication information to the terminal, where the small data is data whose data volume is less than a preset data volume threshold. ;

2. The method according to claim 1, wherein the uplink NAS message is: a newly defined uplink NAS message; the downlink NAS message is: a newly defined downlink NAS message; or

The method of claim 2, wherein the newly defined uplink NAS message is: a small data SMD request message; the newly defined downlink NAS message is: an SMD response message;

The method according to any one of claims 1-3, wherein after the core network device sends the small data to the terminal by using a downlink NAS message, the method further includes:

Receiving, by the core network device, the small data receiving confirmation message sent by the terminal, and determining that the small data is successfully sent according to the small data receiving confirmation message, sending the small data transmission success confirmation information to the triggering device;

Receiving, by the core network device, a small data receiving acknowledgement message sent by the terminal, and determining, according to the small data receiving acknowledgement message, that the small data transmission fails, or before the timer that is started after the small data is sent to the terminal is timed out If the small data receiving confirmation message sent by the terminal is not received, the small data is retransmitted to the terminal, and after the retransmission is successful, the small data transmission success confirmation information is sent to the triggering device, and the trigger is triggered after the retransmission fails. The device sends a small data transmission failure confirmation message;

The triggering device is a device that sends small data received by the core network device.

The method according to claim 4, further comprising: after transmitting the small data transmission success confirmation information or the small data transmission failure confirmation information to the trigger device, further comprising:

When the core network device determines that no small data arrives subsequently, the access network device is notified to release the radio resource control connection with the terminal. RRC connection

The method according to any one of claims 1-3, wherein the core network device is a mobility management entity MME or a serving GPRS support node SGSN.

The method according to any one of claims 1-3, wherein the core network device receives the small from a machine communication interconnection server MTC-IWF or a serving gateway S-GW or a gateway GPRS support node GGSN. data.

8. A data receiving method, the method comprising:

The terminal in the idle state receives the paging message sent by the core network device, where the paging message carries the small data indication information; the terminal sends the uplink non-access stratum NAS message in response to the paging message to the core network device; The terminal receives small data that is sent by the core network device by using a downlink NAS message, where the small data is data whose data volume is smaller than a preset data volume threshold.

The method of claim 8, wherein the uplink NAS message is: a newly defined uplink NAS message; the downlink NAS message is: a newly defined downlink NAS message; or

10. The method according to claim 9, wherein the newly defined uplink NAS message is: small data

The SMD request message is: the newly defined downlink NAS message is: an SMD response message;

The method according to any one of claims 8 to 10, wherein after the terminal receives the small data sent by the core network device by using the downlink NAS message, the method further includes:

The terminal sends a small data reception confirmation message to the core network device to notify the core network device whether to successfully receive small data.

The method according to any one of claims 8 to 10, wherein, after the terminal receives the paging message, and before sending the uplink NAS message to the core network device, the method further includes:

The terminal establishes a radio resource control RRC connection with the access network device;

The sending, by the terminal, the uplink NAS message that is sent to the core network device in response to the paging message includes:

Transmitting, by the RRC connection, the uplink NAS message that is sent to the access network device by using the RRC connection, to notify the access network device to forward the uplink NAS message to the core network device;

Receiving, by the terminal, the small data that is sent by the core network device by using the downlink NAS message includes:

Receiving, by the terminal, the downlink from the core network device that is forwarded by the access network device by using the RRC connection

The NAS message, the downlink NAS message carries the small data.

The method according to any one of claims 8 to 10, wherein the core network device is a mobility management entity MME or a serving GPRS support node SGSN.

14. A data transmitting apparatus, the apparatus comprising:

a data receiving unit, configured to receive small data that needs to be sent to a terminal in an idle state, where the small data is data whose data amount is smaller than a preset data amount threshold;

a data transmission unit, configured to receive, by the terminal, an uplink non-access stratum NAS that responds to the paging message After the message, the small data is sent to the terminal by using a downlink NAS message.

The device according to claim 14, wherein the uplink NAS message is: a newly defined uplink NAS message; the downlink NAS message is: a newly defined downlink NAS message; or

The apparatus according to claim 15, wherein the newly defined uplink NAS message is: a small data SMD request message; the newly defined downlink NAS message is: an SMD response message;

17. The device of any of claims 14-16, wherein the device further comprises:

a transmission confirmation unit, configured to: upon receiving the small data reception confirmation message sent by the terminal, and determining, according to the small data reception confirmation message, that the small data transmission is successful, sending the small data transmission success confirmation information to the trigger device; The small data received by the terminal receives the confirmation message, and determines that the small data transmission fails according to the small data reception confirmation message, or does not receive the terminal before the timer that is turned on after the small data is sent to the terminal times out. When the small data receives the acknowledgement message, the small data is retransmitted to the terminal, and after the retransmission is successful, the small data transmission success confirmation information is sent to the trigger device, and after the retransmission fails, the small data transmission failure confirmation is sent to the trigger device. Information

18. The device of claim 17, wherein the device further comprises:

a connection release unit, configured to notify the access network device to release the radio resource control connection with the terminal when no subsequent small data arrives. RRC connection

The device according to any one of claims 14-16, wherein the data receiving unit is configured to: receive from a machine communication interconnection server MTC-IWF or a serving gateway S-GW or a gateway GPRS support node GGSN The small data.

20. A data receiving device, the device comprising:

And a data receiving unit, configured to receive small data that is sent by the core network device by using a downlink NAS message, where the small data is data whose data volume is less than a preset data volume threshold.

The device according to claim 20, wherein the uplink NAS message is: a newly defined uplink NAS message; the downlink NAS message is: a newly defined downlink NAS message; or The uplink NAS message is: an extended existing uplink NAS message; and the downlink NAS message is: an extended existing downlink NAS message.

The device according to claim 21, wherein the newly defined uplink NAS message is: a small data SMD request message; the newly defined downlink NAS message is: an SMD response message;

The device according to any one of claims 20-22, wherein the device further comprises:

And a receiving confirmation unit, configured to send a small data receiving confirmation message to the core network device, to notify the core network device whether the small data is successfully received.

24. The apparatus of any of claims 20-22, wherein the apparatus further comprises:

a connection establishing unit, configured to establish a radio resource control RRC connection with the access network device after receiving the paging message and before sending the uplink NAS message to the core network device;

The paging response unit is configured to:

The data receiving unit is configured to:

Receiving a downlink NAS message from the core network device that is forwarded by the access network device by using the RRC connection, where the downlink NAS message carries the small data.

A mobility management entity MME, characterized in that the MME comprises the apparatus according to any one of claims 14-19.

26. A service GPRS support node SGSN, characterized in that said SGSN comprises a device as claimed in any one of claims 14-19.

27. A machine communication MTC terminal, characterized in that the terminal comprises a device as claimed in any one of claims 20-24.