WO2013010486A1 - Method and device for data transmission - Google Patents

Abstract

Disclosed are a method and device for data transmission, used for reducing signaling overhead required during data transmission of a limited data volume, for simplifying data transmission process, and for improving system efficiency. The method for data transmission provided in the present application comprises: a base station receiving a request for transmitting specific data from a core network, and acquiring therefrom the specific data and an identity of a user equipment (UE) that needs to receive the specific data; the base station paging for the UE on the basis of the identity of the UE, and, when a paging response replied by the UE is received, transmitting the specific data to the UE via a signaling radio bearer (SRB).

Description

 The present invention claims the priority of the Chinese patent application filed on July 21, 2011, the Chinese Patent Application No. 201110205314.1, entitled "A Data Transmission Method and Apparatus", the entire contents of which are incorporated herein by reference. This is incorporated herein by reference. The present invention relates to the field of communications technologies, and in particular, to a data transmission method and apparatus. The network architecture of the Long Term Evolution (LTE) system is shown in Figure 1. In order to facilitate the development of new services, the LTE system adopts a design method in which the user plane and the control plane are separated, and the control plane signaling and user plane are used. The bearers are respectively responsible for the independent network element Mobile Management Entity (MME) and the Serving Gateway (S-GW). The main functions of the MME are non-access stratum (NAS) signaling establishment, NAS signaling security, signaling establishment across core networks, and when LIE (Line Interface Equipment line interface device) is in idle mode. Tracking services, roaming services, authorization and bearer management, and more. The S-GW is the gateway point for e B (Evolved NodeB) handover, forwarding 2G / 3G and other system service gateway points, completing downlink packet buffering, some initialization work, specified interception interception, and packet routing. And forwarding, etc. The group data network gateway P-GW (Packet Gateway) is used for policy enforcement, packet filtering, specified interception, user equipment (UE) IP address allocation, charging function, packet reproduction, and the like.

 The control signaling between the UE, the eNB and the core network is processed by the MME; the user data is transmitted to the sub-P-GW through the S-GW, and then transmitted to the external access point name by the P-GW (Access Point Name, APN) node. Since the coupling of the control signaling and the user data is reduced, when the new service occurs, only the network element responsible for the user plane is upgraded, and the control information transmission is not affected, thereby greatly reducing the complexity of the network maintenance. And equipment upgrade costs.

 In the idle state of the UE in the LTE system, if there is data to be sent to the network side, the signaling flow in the connection setup process before the data transmission is as shown in FIG. 2, including:

 Message (Msg) 1 : When the UE has data to transmit, it first waits for the random access channel (RACH) scheduling period according to the random access resource information configured by the system, selects a preamble code and sends it to the eNB.

 Msg 2: After receiving the preamble sent by the UE, the eNB responds to the random access sent by the UE in the random access response window.

A random access response message may respond to a random access request (preamble) of multiple UEs. The random access response is scheduled by the Downlink Control Information (DCI) of the random access-Radio Network Temporary Identity (RA-RNTI), and the RA-RNTI is transmitted by the time-frequency resource of the Msg 1 Location is determined. The contents of the random access response include: a backoff parameter, and a preamble corresponding to Msg 1. Identification, uplink transmission TA (timing advance), Msg3 allocated uplink resource (Msg3 scheduling information), Cell Radio Network Temporary Identity (C-RNTI). The backoff parameter is used to indicate the average delay of the next time the UE initiates random access if the random access fails. The UE determines the random access response sent to itself by using the preamble identifier in the RA-RNTI and the Msg2. If the preamble corresponding to the preamble identifier in the Msg2 includes the preamble when the random access is initiated by itself, the UE considers that it successfully receives the random access. In the response message, Msg3 will be sent to the network side. If the UE does not correctly receive the Msg2, the delay of the next random access is determined according to the delay limit of the backoff parameter, and the random access resource is selected to initiate the next random access. After the maximum number of random accesses is reached, the media access control (MAC) layer of the UE reports a random access problem to the Radio Resource Control (RRC) layer, triggering a radio link failure process.

 Msg3: After receiving the Msg2, the UE sends Msg3 on the uplink resource allocated by Msg2. Msg3 contains different content for different scenarios. In the initial access, the RRC connection reestablishment request message generated by the RRC layer is carried in the Msg3.

 Msg4: e B and UE complete the final competition resolution through Msg4. The Msg4 content corresponds to the content of Msg3. In the initial access, the Msg4 carries the UE to resolve the Contention Resolution Identity (MAC CE), which includes the Common Control Channel (CCCH) service data unit transmitted by the UE in the Msg3 ( Service Data Unit (SDU), after receiving the MAC CE, the UE compares with its own RRC layer information to complete the contention resolution. In addition, the Msg4 may include an RRC connection setup message for establishing the UE's Signaling Radio Bear 1 (SRB1).

 Msg5: After the contention resolution is completed, the UE establishes a signaling radio bearer 1 (SRB1) according to the information in the RRC connection setup message, and sends an RRC connection setup complete message to the network. The NAS service request message may be sent to the network side when the RRC Connection Setup Complete message is sent.

 After receiving the RRC connection setup complete message, the eNB sends the piggybacked NAS service request message to the MME to request the MME to establish an association between the eNB corresponding to the UE and the core network element, including the control plane connection with the MME. And an evolved radio access bearer (E-RAB) with the S-GW.

 Msg7: The MME notifies e B of the information corresponding to the UE connection.

 Msg8: The eNB sends a Security Mode Command (SMC) and an RRC Connection Reconfiguration message to the UE. It is used to activate the security of the UE and establish a Data Radio Bear (DRB) and other signaling radio bearers (such as SRB 2) for the UE. It should be noted that the security mode command (SMC) and the RRC connection reconfiguration may be sent in one RRC message or separately.

 Msg9: After the security activation and the DRB and SRB2 configurations are completed, the UE sends a security mode complete message and an RRC connection reconfiguration complete message to the network side.

 MsglO: After the above process, the user plane data of the UE is carried by the DRB and the SI interface, and is sent to the core network through the e B and the S-GW; the control signaling between the UE and the core network is controlled by the SRB, the eNB and the MME. The face connection is sent to the MME.

For the UE in the detached state, when the UE needs to send data to the network side, the UE needs to initiate the attachment first. The attach process is attached to the network. In addition, in order to determine the legitimacy of the user, it is necessary to confirm through the process of the authentication process. The signaling flow will be more complicated than the process shown in Figure 2.

 Machine-type communication (MTC) is a new communication concept. Its purpose is to combine many different types of communication technologies, such as: machine-to-machine communication, machine control communication, human-computer interaction communication, mobile Connected communications to promote social production and lifestyle development. It is expected that the business of human-to-human communication may only account for 1/3 of the entire UE market, and a larger number of communications is MTC communication services. Sometimes, MTC communication is also known as Machine-to-machine (M2M) communication or the Internet of Things.

 Current mobile communication networks are designed for communication between people, such as: determination of network capacity, and the like. If it is desired to use mobile communication networks to support MTC communication, it is necessary to optimize the mechanism of the mobile communication system according to the characteristics of the MTC communication, so that it can be better in the case where the traditional human-to-human communication is not affected or less affected. Realize MTC communication.

 The current recognized characteristics of MTC communication are:

 MTC UE has low mobility;

 The time for data transmission between the MTC UE and the network side is controllable;

 The data transmission performed by the MTC UE and the network side does not require high real-time data transmission, that is, it has time tolerance;

MTC UEs are energy limited and require very low power consumption;

 Only small amount of information is transmitted between the MTC UE and the network side;

 MTC UEs can be managed in groups;

 An actual MTC UE may have one or more of the above features.

 Although in the machine type communication (MTC), the number of MTC UEs will greatly exceed the number of traditional communication UEs, in many MTC application scenarios, there are some one-way downlink small data and pull data (PULL DATA) The method of requesting the terminal to report data. In the scenario of uplink and downlink small data transmission, the amount of data transmitted each time is not very large (usually tens to hundreds of bytes), and one or several subframes can be transmitted. However, in order to transmit the data, the network and the MTC UE need to establish the DRB/radio bearer (RB) and the Sl/Iu interface bearer according to the current signaling method according to the current data transmission mode, and then pass the DRB/ The RB, the Sl/Iu bearer transmits data between the UE and the network side. The SRB in the prior art can only be used for transmitting signaling, and cannot be used for transmitting data. Therefore, the signaling overhead required to transmit small amounts of data will be relatively large, severely degrading system efficiency. Summary of the invention

 The embodiment of the invention provides a data transmission method and device, which are used to reduce signaling overhead required for data transmission of small data volume, streamline data transmission process, and improve system efficiency.

 A data transmission method provided by an embodiment of the present invention includes:

The base station receives a specific data transmission request from the core network, acquires specific data therefrom, and needs to receive the specific number The identifier of the user equipment UE;

 The base station pages the UE according to the identifier of the UE, and after receiving the paging response replied by the UE, sends the specific data to the UE by using the signaling radio bearer SRB.

 A data transmission method provided by an embodiment of the present invention includes:

 The user equipment UE receives the paging message sent by the base station, and returns a paging response to the base station;

 The UE receives the specific data sent by the base station through the signaling radio bearer SRB.

 A data transmission apparatus provided by an embodiment of the present invention includes:

 a data sending request receiving unit, configured to receive a specific data sending request from the core network, and obtain specific data therefrom and an identifier of the user equipment UE that needs to receive the specific data;

 The specific data sending unit is configured to page the UE according to the identifier of the UE, and after receiving the paging response replied by the UE, send the specific data to the UE by using the signaling radio bearer SRB.

 A data transmission apparatus provided by an embodiment of the present invention includes:

 a paging processing unit, configured to receive a paging message sent by the base station, and reply the paging response to the base station;

 The specific data receiving unit is configured to receive the specific data sent by the base station by using the signaling radio bearer SRB.

 In the embodiment of the present invention, the base station receives a specific data sending request from the core network, and obtains specific data and an identifier of the user equipment UE that needs to receive the specific data. The base station pages the UE according to the identifier of the UE, and receives the reply of the UE reply. After the response, the specific data is sent to the UE by the signaling radio bearer, and the DRB/RB and the Sl/Iu bearer are not required to be established, thereby reducing the data of the small data volume sent by the network side to the UE side (that is, the specific data). The signaling overhead required, the streamlined data transmission process, and the system efficiency are improved.

 In the embodiment of the present invention, the user equipment UE receives the paging message sent by the base station, and returns a paging response to the base station; the UE receives the specific data sent by the base station by using the signaling radio bearer SRB, and does not need to establish a DRB/RB or a Sl/Iu bearer. Therefore, the signaling overhead required when the UE side acquires the small amount of data (that is, the specific data) sent by the network side is reduced, and the data transmission process is simplified, thereby improving system efficiency. DRAWINGS

 FIG. 1 is a schematic diagram of a network architecture of an LTE system;

 2 is a schematic diagram of a connection/bearing establishment process of an LTE system;

 3 is a schematic flowchart of a specific method for data transmission according to an embodiment of the present invention;

 4 is a schematic flowchart of a data transmission method on a base station side according to an embodiment of the present invention;

 FIG. 5 is a schematic flowchart of a data transmission method on a UE side according to an embodiment of the present disclosure;

FIG. 6 is a schematic diagram of a process for correctly receiving data according to an embodiment of the present invention; FIG. 7 is a schematic diagram of a data error receiving process according to an embodiment of the present invention;

 FIG. 8 is a schematic diagram of a new service initiation process according to an embodiment of the present invention;

 FIG. 9 is a schematic flowchart of an uplink small data sending process according to an embodiment of the present invention;

 FIG. 10 is a schematic structural diagram of a data transmission apparatus according to an embodiment of the present disclosure;

 FIG. 11 is a schematic structural diagram of a data transmission apparatus according to an embodiment of the present invention. detailed description

 Embodiments of the present invention provide a data transmission method and apparatus, which are used to reduce the signaling overhead required for data transmission of a small amount of data, streamline the data transmission process, and improve system efficiency.

 In many machine type communication (MTC) applications, a typical case is to transfer small amounts of data. The traditional data transmission method will generate large signaling overhead and low system efficiency. Therefore, how to optimize the small data transmission process, reduce the signaling required to establish and maintain user plane connections, and reduce signaling overhead. The improvement of the system efficiency is the main problem to be solved by the technical solution provided by the embodiment of the present invention.

 In the embodiment of the present invention, the base station determines that the UE access destination is to receive small data in the RRC connection establishment process, and uses the SRB to send downlink small data to the UE, and the two parties automatically release the RRC connection after the UE successfully receives the UE.

 The small data described in the embodiment of the present invention, that is, the data with a small amount of data, the specific data amount may be specified by the operator, for example, the data volume of the small data may range from several tens of bytes to several hundred bytes.

 The specific plan is as follows:

 The behavior of the base station (e B ) side includes:

 Step 1: Receive a request message for sending small data from the core network, and use the S-TMSK SAE Temporary Mobile Station Identifier of the UE, the SAE temporary mobile station identifier to page the UE, and the base station saves the paging reason as downlink small data transmission.

 The small data request message sent by the core network may be a newly defined message carrying the UE identifier and the small data, or may be a paging message capable of carrying small data, or may be two messages, one is seeking Call message, a message for carrying small data.

 Step 2: When the base station receives a paging response message that is sent by the UE and carries the UE identifier as S-TMSI and the access reason is called mt-access (that is, the reason for accessing the response in response to the paging), Determining whether the reason for paging the UE is for small data transmission, and if yes, storing small data corresponding to the S-TMSI, carrying the small data in the RRC Connection Setup message; further, if there is no more The data needs to be sent to the UE, and it is also indicated in the message that the RRC connection can be released, so that after the UE receives the small data, the RRC connection can be released.

The small data may be encapsulated by a NAS container (a container for encapsulating NAS signaling), that is, the content of the small data is placed in the NAS container, and the NAS container is carried in the RRC Connection Setup message. Further, the SRB1 may be configured in the RRC connection setup message without configuring other SRBs and DRBs. The subsequent UE may send an RRC Connection Setup Complete message to the base station through the SRB1.

 Step 3: When the eNB receives the RRC Connection Setup Complete message sent by the UE, it determines whether the UE successfully obtains the small data according to the indication information of whether the specific data is successfully acquired, and further obtains whether to release the UE from the message. The indication message of the RRC connection, if the UE indicates that the RRC connection of the UE can be released, the base station releases the RRC connection of the UE, and deletes the information related to the UE; if the UE indicates that the specific data is successfully acquired but does not release the RRC connection, according to the UE further The service request re-configures the related resources to continue the subsequent normal service process; if the UE indicates that the specific data is not successfully acquired, it may decide whether to resend the small data according to the interaction with the core network, or release the message by using the RRC connection release message. RRC connection of the UE.

 In the case that the base station pages the UE but does not have the UE access, the base station may automatically delete the small data of the UE after a period of time, or delete the small data of the UE according to the indication given by the core network.

 The UE side behavior includes:

 When the UE receives the RRC Connection Setup message, if it carries the NAS container, it forwards it to the upper layer (the NAS layer). If the upper layer confirms that the NAS container is correctly parsed, the UE successfully acquires the specific data (small data) and sends the RRC connection establishment. A completion message indicating that the UE successfully acquired the specific data.

 If the base station further indicates that the receiving of the small data is completed in the RRC Connection Setup message, the RRC connection may be released, and if the UE does not have other services to initiate, the RRC connection establishment completion message may further indicate that the RRC connection may be released; When the service is initiated, it indicates that the RRC connection cannot be released.

 The technical solutions provided by the embodiments of the present invention are described below with reference to the accompanying drawings.

 Referring to FIG. 3, a data transmission method provided by an embodiment of the present invention includes:

 Step 1: The small-data transmission is performed on the network side, and the MTC server needs to send a small data transmission request through the MME entity. Step 2: The MME entity sends the small data to be sent to the UE and the S-TMSI of the UE to the relevant base station. 3: The base station saves the S-TMSI of the UE and the small data that needs to be sent to the UE, and pages the UE by using a paging message, where the identifier carried is S-TMSI;

 Step 4: The UE initiates a random access procedure by using a random access request.

 Step 5: The base station provides synchronization information to the UE in response to the random access request of the UE.

 Step 6: After obtaining the uplink resource, the UE sends an RRC connection setup request message, where the reason is called access (mt-access), and carries the S-TMSI;

 Step 7: After obtaining the mt-access and S-TMSI, the base station determines that the UE access is to receive small data according to the information saved by itself.

Step 8: The base station sends an RRC connection setup message to the UE, where the small data is carried, and the data is encapsulated in the NAS container, and the RRC connection is released when the data is sent. Step 9: The UE receives the RRC connection setup message, forwards the NAS container to the NAS layer, determines whether the small data is successfully acquired, and further determines whether the RRC connection needs to be released, and then sends an RRC connection setup complete message to the base station. The indication message carrying the small data is successfully carried, and the indication message of whether to release the RRC connection may further be carried.

 If the UE correctly parses the NAS container, it indicates that the small data is successfully acquired in the sent RRC connection setup complete message, and the RRC connection is released. After the message is sent successfully, the related resources are automatically released.

 If the UE does not successfully acquire the small data, it indicates that the acquisition of the small data fails in the sent RRC connection setup complete message, and enters the connection state to wait for the response of the network.

 If the UE successfully obtains the small data, but another service needs to be initiated or needs to perform the uplink small data transmission, the RRC connection establishment complete message indicates that the small data is successfully acquired, and the RRC connection is not released, so that the subsequent process can be simultaneously performed. Carry NAS signaling or carry uplink small data through the NAS container.

 Step 10: After receiving the RRC connection setup complete message sent by the UE, the base station sends a small data transmission acknowledgement message to the MME according to whether the UE carried in the UE successfully obtains the small data indication message.

 If the UE successfully obtains the small data, the sent small data transmission confirmation message includes the indication message that the UE successfully acquires the small data. That is, the small data transmission confirmation message at this time is a small data transmission success confirmation message.

 If the UE does not successfully obtain the small data, the sent small data transmission confirmation message includes the indication message that the UE does not successfully obtain the 'J, the data. That is, the data transmission confirmation message at this time is a small data transmission failure confirmation message.

 The base station can continue to service/allocate resources for the UE according to the new service request of the UE (carried by the NAS signaling), and then enters a normal operation process, and uses existing relevant regulations for processing.

 Step 11: After receiving the small data transmission confirmation message, the MME sends a small data transmission confirmation message to the MTC server (server).

 Finally, the MTC server determines the subsequent processing:

 If the small data transmission acknowledgement message is a small data transmission failure acknowledgement message, the base station may be instructed to release the RRC connection by using the RRC connection release message, or may instruct the base station to retransmit the small data by using the NAS signaling.

 It should be noted that the small data described in the embodiment of the present invention is an example of small data generated by the MTC server, and the same applies to cases where other core network nodes have small data to be transmitted.

 The UE described in the embodiment of the present invention is an authenticated UE, that is, the UE already has S-TMSI. For the UE that does not allocate the S-TMSI, after the authentication is required, the small data is sent, and the specific authentication process is present. There is technology and will not be described here.

 In order to unify the process of small data transmission, it is stipulated that after the UE is authenticated, the NAS container is still used to encapsulate the small data, and the NAS container encapsulating the small data is transmitted through the SRB.

 In summary, on the base station side, referring to FIG. 4, a data transmission method provided by an embodiment of the present invention includes:

S101. The base station receives a specific data sending request from the core network, acquires specific data therefrom, and needs to receive the The identifier of the user equipment UE of the specific data;

 S102: The base station pages the UE according to the identifier of the UE, and after receiving the paging response replied by the UE, sends the specific data to the UE by using the signaling radio bearer SRB.

 The specific data described in the embodiment of the present invention, that is, the data having a small amount of data, that is, the small data, may have a data amount ranging from several tens of bytes to several hundreds of bytes.

 Preferably, the base station sends the specific data to the UE through the SRB, including:

 The base station controls the RRC connection setup message through the radio resource carried by the SRB, and sends the specific data to the UE.

 Preferably, the base station sends the specific data to the UE by using an RRC connection setup message, including:

 The base station encapsulates the specific data through the non-access stratum container NAS container, and carries the NAS container encapsulating the specific data in the RRC connection setup message and sends the message to the UE.

 Preferably, the RRC connection setup message further includes information indicating that the UE releases the RRC connection.

 Preferably, the method further includes:

 The base station receives the RRC connection setup complete message sent by the UE, and obtains indication information about whether the UE successfully acquires the specific data.

 Preferably, the method further includes:

 The base station acquires an indication message of whether to release the RRC connection of the UE from the RRC connection setup complete message; when the UE successfully acquires the specific data, and the UE instructs to release the RRC connection, the base station releases the RRC connection of the UE. Preferably, when the UE does not successfully obtain the specific data, the method further includes:

 The base station releases the RRC connection of the UE; or

 The base station releases the RRC connection of the UE, and re-transmits the specific data to the UE through the paging process and the RRC connection setup message in the corresponding RRC connection establishment process; or

 The base station does not release the RRC connection of the UE, and sends specific data to the UE by using the SRB that transmits the NAS signaling; or the base station does not release the RRC connection of the UE, and sends the specific data to the UE through the data radio bearer DRB.

 Preferably, the method further includes:

 When the base station does not receive the paging response of the UE reply in the preset time, the base station deletes the specific data of the UE; or, when receiving the indication information of the specific data of the deleted UE from the core network, the base station deletes the specific data of the UE. . Preferably, the SRB is SRB 0, and according to a protocol definition, the SRB0 is used for an RRC message using a CCCH logical channel.

 Correspondingly, on the UE side, referring to FIG. 5, a data transmission method provided by an embodiment of the present invention includes:

 S201: The user equipment receives a paging message sent by the base station, and returns a paging response to the base station.

 S202: The UE receives the specific data sent by the base station by using the signaling radio bearer SRB.

Preferably, the UE receives the specific data sent by the base station by using the SRB, including: The UE controls the RRC connection setup message through the radio resource carried by the SRB, and receives the specific data sent by the base station. Preferably, the UE receives the specific data sent by the base station by using an RRC connection setup message, including:

 The UE determines whether the specific data carried in the non-access stratum container NAS container in the RRC connection setup message can be correctly parsed, and if yes, obtains specific data from the NAS container, and determines that the specific data acquisition succeeds; otherwise, determines that the specific data acquisition fails. .

 Preferably, the method further includes:

 The UE sends an RRC connection setup complete message to the base station, where the indication information of whether the specific data is successfully acquired is carried. Preferably, the RRC connection setup complete message further includes indication information about whether to release the RRC connection of the UE. Preferably, the RRC connection setup complete message further includes a service request message or uplink specific data.

 Preferably, the SRB is SRB 0

 In the embodiment of the present invention, the NAS container carrying the data and the data is added to the RRC connection setup message, and the indication information of the RRC connection may be released. The specific content of the RRC connection setup message is as follows:

 RRCConnectionSetup = SEQUENCE {

 Rrc - Transact ionl dent if ier RRC -Transact ionl dent if ier ,

 criticalExt ens ions CHOICE {

 CHOICE {

 rrcConnectionSetup- r8 RRCConnectionSetup- r8 - IEs

 Spare7 NULL ,

 Spare6 NULL , spare5 NULL , spare4 NULL

 Spare3 NULL , spare2 NULL , sparel NULL

 i.

 criticalExtens ions Future SEQUENCE { }

RRCConnectionSetup- r8 - IEs = SEQUENCE {

 radioResourceConf igDedicated RadioResourceConf igDedicated

 nonCriticalExtension RRCConnectionSetup- v8 a 0 - IEs OPTIONAL

}

 RRCConnectionSetup- v8 a 0 - IEs SEQUENCE {

 lateNonCriticalExtension OCTET STRING OPTIONAL Need OP nonCriticalExtension RRCConnectionSetup- vxyO - IEs OPTIONAL Need OP

}

 RRCConnectionSetup- vxyO - IEs SEQUENCE {

 Releaselnd ENUMERATED { true } OPTIONAL

 Dedicatedlnf oNAS Dedicatedlnf oNAS OPTIONAL

 nonCriticalExtension SEQUENCE { } OPTIONAL - - eed OP where releaselnd, if true, indicates that the UE can release the RRC connection after receiving the small data. DedicatedlnfoNAS is a NAS container used to carry small data.

 In the embodiment of the present invention, the indication information of whether the UE successfully acquires the small data is added in the RRC connection complete message, and whether the indication information of the RRC connection is released, and the specificity of the RRC connection complete message is as follows:

 RRCConnectionSetupComplete SEQUENCE {

 Rrc -Transact ionl dent if ier RRC -Transact ionl dent if ier ,

 criticalExtens ions CHOICE {

 CHOICE {

 rrcConnectionSetupComplete- r8 RRCConnectionSetupComplete- spare3 NULL , spare2 NULL , sparel NULL

 criticalExtens ions Future SEQUENCE { }

RRCConnectionSetupComplete - r8 - SEQUENCE {

Select edPL - Identity INTEGER ( 1 . . 6 )■ Registered E RegisteredMME OPTIONAL dedicatedlnf oNAS Dedicatedlnf oNAS ,

 nonCriticalExtension RRCConnectionSetupComplete-v8aO- IEs OPTIONAL

RRCConnectionSetupComplete-v8aO- IEs SEQUENCE {

 lateNonCriticalExtension OCTET STRING OPTIONAL,

 nonCriticalExtension RRCConnectionSetupComplete-vl020- IEs OPTIONAL

 }

 RRCConnectionSetupComplete-vl020- IEs = SEQUENCE {

 gummei-Type-rlO ENUMERATED {native, mapped} OPTIONAL,

 Rlf - Inf oAvailable-rlO ENUMERATED {true} OPTIONAL,

 logMeasAvailable-rlO ENUMERATED {true} OPTIONAL,

 rn-Subf rameConf igReq-rlO ENUMERATED {required, notRequired} OPTIONAL,

 nonCriticalExtension RRCConnectionSetupComplete-vxyO- IEs OPTIONAL

 }

 RRCConnectionSetupComplete- vxyO -IEs SEQUENCE {

 dataReceivedlnd ENUMERATED {true} OPTIONAL

 connectionRellnd ENUMERATED {true} OPTIONAL

 nonCriticalExtension SEQUENCE { } OPTIONAL

 }

 RegisteredMME = SEQUENCE {

 Plmn- Identity PLMN- Identity OPTIONAL

 Mmegi BIT STRING (SIZE (16) )

 Mmec MMEC

 }

 If dataReceivedlnd is true, it indicates that the UE successfully acquires small data. Otherwise, it indicates that the UE has not successfully acquired the small data. When connectionRellnd is true, it indicates that the UE will release the RRC connection by itself; otherwise, it indicates that the UE does not release the RRC connection.

 A description of several specific embodiments is given below.

 Embodiment 1:

 Similar to the flow shown in FIG. 3, after receiving the RRC connection setup message, the UE forwards the NAS container to the NAS layer, and obtains the indication information of whether the small data is successfully obtained from the NAS layer, if the small data is correctly acquired. Then, according to the flow shown in Figure 6.

 Embodiment 2:

 Similar to the process shown in FIG. 3, after receiving the RRC connection setup message, the UE forwards the NAS container to the NAS layer, and obtains the indication information of whether the small data is successfully obtained from the NAS layer, if the small data is not successfully obtained. Then, according to the flow shown in Figure 7.

 Embodiment 3:

 Similar to the flow shown in FIG. 3, after receiving the RRC connection setup message, the UE forwards the NAS container to the NAS layer, and obtains the indication information of whether the small data is successfully obtained from the NAS layer, if the small data is correctly acquired. And to determine that the NAS also needs to initiate a new service request, then process according to the process shown in FIG.

 The base station does not release the RRC connection, but continues to forward the service request (service request) message to the MME, and performs the subsequent process according to the existing regulations.

 Embodiment 4:

Similar to the flow shown in FIG. 3, after receiving the RRC connection setup message, the UE will use the NAS container therein. Forward to the NAS layer, and obtain the indication information of whether the small data is successfully obtained from the NAS layer. If the small data is correctly acquired and it is determined that the NAS has uplink small data to be transmitted, the process is performed according to the flow shown in FIG.

 The base station does not release the RRC connection, but forwards the uplink small data to the MME. The forwarding may be a separate message, and the uplink small data may be carried in the small data transmission confirmation message and sent to the MME.

 In the embodiment of the present invention, the data transmission request sent by the core network to the base station may be carried by a paging message on the S1 interface, and the related content that needs to be added in the paging message is as follows:

基站收到小数据后， 将小数据提取出来， 发送寻呼消息给 UE, UE接入后， 基站根据保 存的 UE标识、 需要发给该 UE的小数据以及 UE接入携带的信息， 判断 UE接入目的是接收 小数据 , 再将小数据通过 RRC连接建立消息发送给 UE。

After receiving the small data, the base station extracts the small data and sends the paging message to the UE. After the UE accesses, the base station determines the UE according to the saved UE identifier, the small data that needs to be sent to the UE, and the information that the UE accesses. The purpose of the access is to receive small data, and then send the small data to the UE through an RRC connection setup message.

 When the core network sends small data, the small data request must be sent along with the sending of the paging message. The small data request includes the UE identifier and the small data. The paging message includes the S-TMSI of the target UE for small data transmission. The base station saves the content carried in the data request, and waits for the UE to access, and then carries the message and the data to the UE through the RRC connection setup message of the SRB0. After the small data transmission succeeds, or when the base station initiates paging to the UE, if the UE does not access the base station, the base station automatically deletes the UE related information. The preset time may be set according to actual needs, for example, may be 2 minutes or the like.

 On the network side, referring to FIG. 10, an embodiment of the present invention provides a data transmission apparatus, including:

 The data sending request receiving unit 11 is configured to receive a specific data sending request from the core network, and obtain specific data and an identifier of the user equipment UE that needs to receive the specific data;

 The specific data sending unit 12 is configured to page the UE according to the identifier of the UE, and after receiving the paging response replied by the UE, send the specific data to the UE by using the signaling radio bearer SRB.

 Preferably, the specific data sending unit 12 controls the RRC connection setup message by using the radio resource carried by the SRB, and sends the specific data to the UE.

 Preferably, the specific data sending unit 12 encapsulates the specific data through the non-access stratum container NAS container, and carries the NAS container encapsulating the specific data in the RRC connection setup message and sends the message to the UE.

 Preferably, the RRC connection setup message further includes information indicating that the UE releases the RRC connection.

 Preferably, the device further comprises:

The RRC connection setup complete message receiving unit 13 is configured to receive an RRC connection setup complete message sent by the UE, and Obtaining indication information of whether the UE successfully acquires specific data.

 Preferably, the RRC connection setup complete message receiving unit 13 is further configured to: obtain an indication message of whether to release the RRC connection of the UE from the RRC connection setup complete message; when the UE successfully acquires specific data, and the UE indicates release When the RRC is connected, the RRC connection of the UE is released.

 Preferably, when the UE does not successfully acquire the specific data, the RRC connection setup complete message receiving unit 13 is further configured to:

 Release the UE's RRC connection; or,

 Release the RRC connection of the UE, and trigger the specific data sending unit to re-transmit the specific data to the UE by using the paging process and the RRC connection setup message in the corresponding RRC connection establishment process; or

 The base station does not release the RRC connection of the UE, and sends the specific data to the UE by using the SRB that transmits the NAS signaling; or, does not release the RRC connection of the UE, and sends the specific data to the UE through the data radio bearer DRB.

 Preferably, the apparatus further includes a release data unit 14 for:

 When the base station does not receive the paging response replied by the UE in the preset time, the specific data of the UE is deleted; or, when the indication information of the specific data of the deleted UE from the core network is received, the specific data of the UE is deleted.

 Preferably, the SRB is SRB 0.

 Correspondingly, on the UE side, referring to FIG. 11, a data transmission apparatus according to an embodiment of the present invention includes: a paging processing unit 21, configured to receive a paging message sent by a base station, and reply a paging response to the base station;

 The specific data receiving unit 22 is configured to receive the specific data sent by the base station by using the signaling radio bearer SRB.

 Preferably, the specific data receiving unit 22 controls the RRC connection setup message through the radio resource carried by the SRB, and receives the specific data sent by the base station.

 Preferably, the specific data receiving unit 22 determines whether the non-access layer container in the RRC connection setup message can be established.

The specific data carried by the NAS container is correctly parsed. If yes, specific data is obtained from the NAS container to determine that the specific data is successfully acquired; otherwise, it is determined that the specific data acquisition fails.

 Preferably, the device further comprises:

 The RRC connection setup complete message sending unit 23 is configured to send an RRC connection setup complete message to the base station, where the indication information of whether the specific data is successfully acquired is carried.

 Preferably, the RRC connection setup complete message further includes indication information about whether to release the RRC connection of the UE. Preferably, the RRC connection setup complete message further includes a service request message or uplink specific data.

 Preferably, the SRB is SRB 0.

In summary, the main scenario of the M2M is that a large number of UEs exist in the network, and the amount of data that the MTC UEs in most scenarios need to interact with the network is small, and the signaling load is compared with the user data load, and the overhead is relatively large. In order to solve this problem, the embodiment of the present invention proposes: carrying the downlink small data by using the RRC connection setup message of the SRB0, and Providing an indication that the connection can be automatically released; confirming the small data reception by the RRC connection setup complete message, and providing an indication of whether the connection will be automatically released, thereby avoiding a large signaling overhead caused by establishing a data plane radio bearer DRB of the user plane The embodiment of the present invention achieves the purpose of reducing signaling overhead by optimizing control plane signaling and using SRB to transmit downlink small data volume.

 Those skilled in the art will appreciate that embodiments of the present invention can be provided as a method, 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 embodied in the form of one or more computer program products embodied on a computer usable storage medium (including but not limited to disk storage and optical storage, etc.) in which computer usable program code is embodied.

 The present invention has been described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products 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, 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.

 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 the modifications

Claims

Rights request A data transmission method, characterized in that the method comprises:  The base station receives a specific data transmission request from the core network, and obtains specific data therefrom and an identifier of the user equipment UE that needs to receive the specific data;  The base station pages the UE according to the identifier of the UE, and after receiving the paging response replied by the UE, sends the specific data to the UE by using the signaling radio bearer SRB.  2. The method according to claim 1, wherein the base station sends the specific data to the UE through the SRB, including:  The base station controls the RRC connection setup message through the radio resource carried by the SRB, and sends the specific data to the UE.  The method according to claim 2, wherein the base station sends the specific data to the UE by using an RRC connection setup message, including:  The base station encapsulates the specific data through the non-access stratum container NAS container, and carries the NAS container encapsulating the specific data in the RRC connection setup message and sends the message to the UE.  The method according to claim 3, wherein the RRC connection setup message further includes information indicating that the UE releases the RRC connection.  5. The method according to claim 1, wherein the method further comprises:  The base station receives the RRC connection setup complete message sent by the UE, and obtains indication information about whether the UE successfully acquires the specific data.  6. The method according to claim 5, wherein the method further comprises:  The base station acquires an indication message of whether to release the RRC connection of the UE from the RRC connection setup complete message; when the UE successfully acquires the specific data, and the UE instructs to release the RRC connection, the base station releases the RRC connection of the UE. The method according to claim 5, wherein when the UE does not successfully acquire the specific data, the method further includes:  The base station releases the RRC connection of the UE; or  The base station releases the RRC connection of the UE, and re-transmits the specific data to the UE through the new paging procedure and the RRC connection setup message in the new RRC connection establishment procedure; or  The base station does not release the RRC connection of the UE, and sends specific data to the UE by using the downlink signaling of the NAS signaling; or  The base station does not release the RRC connection of the UE, and transmits specific data to the UE through the data radio bearer DRB.  8. The method according to claim 1, wherein the method further comprises: When the base station does not receive the paging response of the UE reply in the preset time, the base station deletes the specific data of the UE; or, when receiving the indication information of the specific data of the deleted UE from the core network, the base station deletes the specific data of the UE. . 9. The method according to claim 1, wherein the SRB is SRB 0.  10. A data transmission method, characterized in that the method comprises:  The user equipment UE receives the paging message sent by the base station, and returns a paging response to the base station;  The UE receives the specific data sent by the base station through the signaling radio bearer SRB.  The method according to claim 10, wherein the UE receives the specific data sent by the base station by using the SRB, including:  The UE controls the RRC connection setup message through the radio resource carried by the SRB, and receives the specific data sent by the base station. The method according to claim 11, wherein the UE receives the specific data sent by the base station by using an RRC connection setup message, including:  The UE determines whether the specific data carried in the non-access stratum container NAS container in the RRC connection setup message can be correctly parsed, and if yes, obtains specific data from the NAS container, and determines that the specific data acquisition succeeds; otherwise, determines that the specific data acquisition fails. .  13. The method according to claim 12, wherein the method further comprises:  The UE sends an RRC connection setup complete message to the base station, where the indication information of whether the specific data is successfully acquired is carried. The method according to claim 13, wherein the RRC connection setup complete message further includes indication information of whether to release the RRC connection of the UE.  The method according to claim 13 or 14, wherein the RRC connection setup complete message further includes a service request message or uplink specific data.  16. The method according to claim 10, wherein the SRB is SRB0.  17. A data transmission device, the device comprising:  a data sending request receiving unit, configured to receive a specific data sending request from the core network, and obtain specific data therefrom and an identifier of the user equipment UE that needs to receive the specific data;  The specific data sending unit is configured to page the UE according to the identifier of the UE, and after receiving the paging response replied by the UE, send the specific data to the UE by using the signaling radio bearer SRB.  The device according to claim 17, wherein the specific data sending unit sends the specific data to the UE by using an RRC connection setup message carried by the SRB.  The apparatus according to claim 18, wherein the specific data sending unit encapsulates specific data by using a non-access stratum container NAS container, and carries the NAS container encapsulating the specific data in the RRC connection setup message. Sent to the UE.  The device according to claim 19, wherein the RRC connection setup message further includes information indicating that the UE releases the RRC connection.  The device according to claim 17, wherein the device further comprises: An RRC connection setup complete message receiving unit, configured to receive an RRC connection setup complete message sent by the UE, and Obtain indication information of whether the UE successfully acquires specific data.  The device according to claim 21, wherein the RRC connection setup complete message receiving unit is further configured to: obtain an indication message of whether to release an RRC connection of the UE from the RRC connection setup complete message; The specific data is successfully acquired, and when the UE instructs to release the RRC connection, the UE's RRC connection is released.  The device according to claim 21, wherein, when the UE does not successfully acquire the specific data, the RRC connection setup complete message receiving unit is further configured to:  Release the UE's RRC connection; or,  Release the RRC connection of the UE, and trigger the specific data sending unit to re-transmit the specific data to the UE by using the new paging procedure and the RRC connection setup message in the new RRC connection establishment procedure; or  The base station does not release the RRC connection of the UE, and sends specific data to the UE by using the downlink signaling of the NAS signaling; or  The RRC connection of the UE is not released, and the specific data is transmitted to the UE through the data radio bearer DRB.  The device according to claim 17, further comprising: a release data unit, configured to: delete the specific data of the UE when the base station does not receive the paging response replied by the UE within a preset time; Alternatively, when the indication information of the specific data of the deleted UE from the core network is received, the specific data of the UE is deleted.  The apparatus according to claim 17, wherein the SRB is SRB 0.  26. A data transmission device, the device comprising:  a paging processing unit, configured to receive a paging message sent by the base station, and reply the paging response to the base station;  The specific data receiving unit is configured to receive the specific data sent by the base station by using the signaling radio bearer SRB.  27. The apparatus according to claim 26, wherein: the specific data receiving unit, The RRC connection setup message carried by the SRB receives the specific data sent by the base station.  The apparatus according to claim 27, wherein the specific data receiving unit determines whether the specific data carried in the non-access stratum container NAS container in the RRC connection setup message can be correctly parsed, and if yes, Obtain specific data from the NAS container to determine that the specific data is successfully acquired; otherwise, determine that the specific data acquisition failed.  The device according to claim 28, further comprising:  The RRC connection setup complete message sending unit is configured to send an RRC connection setup complete message to the base station, where the indication information of whether the specific data is successfully acquired is carried.  The device according to claim 29, wherein the RRC connection setup complete message further includes indication information of whether to release the RRC connection of the UE.  The device according to claim 29 or 30, wherein the RRC connection setup complete message further includes a service request message or uplink specific data.  The apparatus according to claim 26, wherein the SRB is SRB 0.