CN108617009B - A data transmission method, device, system and packet data network gateway - Google Patents

Abstract

The invention discloses a data transmission method, device, system and packet data network gateway, because the method receives the uplink non-IP data sent by the terminal UE through the GTP tunnel, and strips it from the GTP tunnel; The identifier of the GTP tunnel of the IP-based data, and the mapping relationship between the identifiers of the pre-established GTP tunnels and the IP addresses assigned to each UE, determine the IP address assigned to the UE that sends the uplink non-IP-based data; For the IP address allocated by the UE for sending the uplink non-IP data and the stripped uplink non-IP data, an uplink IP packet of the uplink non-IP data is generated; the uplink IP packet of the generated uplink non-IP data is generated through the IP network. The message is sent to the data storage and forwarding center. Therefore, the transmission of non-IP data in the IP network is realized, and the compatibility with IP transmission is taken into account.

Description

A data transmission method, device, system and packet data network gateway

technical field

The present invention relates to the field of communication technologies, and in particular, to a data transmission method, device, system and packet data network gateway.

Background technique

Narrow Band Internet of Things (NB-IoT) is an emerging technology in the field of Internet of Things (IoT), which supports the cellular data connection of low-power devices in the wide area network, also known as low-power Wide Area Network (Low Power Wide Area, LPWA). NB-IoT supports long standby time, and the battery life of general NB-IoT devices can be improved to at least 10 years. At the same time, NB-IoT can also provide a very comprehensive coverage of indoor cellular data connections. In addition, NB-IoT is built on cellular networks and consumes only about 180KHz of bandwidth, and can be directly deployed in Global System for Mobile Communication (GSM) networks, Universal Mobile Telecommunications System (UMTS) networks, Or a Long Term Evolution (Long Term Evolution, LTE) network to reduce deployment costs and achieve smooth upgrades.

At present, the mainstream solution of the end-to-end communication process from the terminal to the cloud platform in NB-IoT is still the IP-based solution, that is, the signaling plane of the core network is used to carry the Internet Protocol (IP) data packets in the The transmission is carried out in the signaling, which is no different from the traditional Internet information transmission. Specifically, as shown in FIG. 1 , the data sent by the terminal UE is transmitted to the data storage and forwarding center (Data Exchanging Centre, D-MEC) of the data platform 101 under the narrowband cellular Internet of Things, and the path passes through the base station 102 (Evolved Node B, eNode B). -B), a serving gateway (ServingGateWay, S-GW) and a packet data network gateway (Packet Data Network GetWay, P-GW) of the core network 103 .

For NB-IoT, the 3rd Generation Mobile Communications (3GPP) provides a non-IP transmission method in addition to the traditional IP transmission. Since the data in the non-IP transmission mode is not carried in the IP mode, the traditional IP transmission link is invalid for this mode. However, there is no substantive solution for non-IP transmission in 3GPP. Therefore, how to solve the transmission of non-IP data in NB-IoT, while taking into account the compatibility with IP transmission, is an urgent need to solve. technical problem.

SUMMARY OF THE INVENTION

Embodiments of the present invention provide a data transmission method, device, system, and packet data network gateway, which are used to solve the problem of how to solve the transmission of non-IP data in NB-IoT in the prior art, while taking into account the compatibility with IP transmission. sexual issues.

An embodiment of the present invention provides a data transmission method in a narrowband cellular Internet of Things, including:

receiving the uplink non-IP data sent by the terminal UE through the GTP tunnel, and stripping the uplink non-IP data from the GTP tunnel;

According to the identification ID of the GTP tunnel that receives the uplink non-IP data, and the mapping relationship between the pre-established IDs of each GTP tunnel and the IP addresses allocated to each UE, determine the UE that sends the uplink non-IP data the assigned IP address;

generating an uplink IP message of the uplink non-IP data according to the determined IP address allocated for the UE sending the uplink non-IP data and the stripped uplink non-IP data;

The generated upstream IP packet of the upstream non-IP data is sent to the data storage and forwarding center D-MEC through the IP network.

In a possible implementation manner, in the above-mentioned data transmission method provided by the embodiment of the present invention, the determined IP address allocated for the UE sending the uplink non-IP data and the stripped out uplink data Non-IP data, generating the uplink IP packet of the uplink non-IP data, specifically including:

Using the IP address assigned to the UE for sending the uplink non-IP data as the source IP address, and using the IP address preconfigured for the D-MEC as the destination IP address, and generating uplink IP header information;

The stripped upstream non-IP data is combined with the generated upstream IP packet header information to generate an upstream IP packet of the upstream non-IP data.

In a possible implementation manner, the above-mentioned data transmission method provided by the embodiment of the present invention further includes:

Taking the network access point APN as the granularity, the IP address of the D-MEC is pre-configured.

In a possible implementation manner, the above-mentioned data transmission method provided by the embodiment of the present invention further includes:

When it is determined that the UE initiates attachment and establishes a connection with the public data network PDN of the core network, assigning an IP address to the UE;

According to the GTP tunnel corresponding to the UE, a mapping relationship between the ID of the GTP tunnel corresponding to the UE and the IP address allocated to the UE is established.

In a possible implementation manner, the above-mentioned data transmission method provided by the embodiment of the present invention further includes:

receiving the downlink IP message sent by the D-MEC through the IP network, and stripping the destination IP address and the downlink data from the downlink IP message;

Determine whether the destination IP address carried in the downlink IP packet is the IP address allocated for the UE;

When it is determined that the destination IP address carried in the downlink IP packet is the IP address allocated for the UE, the downlink IP packet is determined according to the pre-established mapping relationship between the ID of each GTP tunnel and the IP address allocated to each UE The ID of the GTP tunnel corresponding to the destination IP address carried;

The downlink data is sent to the corresponding UE through the GTP tunnel as downlink non-IP data.

The embodiment of the present invention also provides a data transmission device in the narrowband cellular Internet of Things, including:

a receiving unit, configured to receive the uplink non-IP data sent by the terminal UE through the GTP tunnel, and strip the uplink non-IP data from the GTP tunnel;

The determining unit is configured to determine, according to the identification ID of the GTP tunnel that receives the uplink non-IP data, and the pre-established mapping relationship between the ID of each GTP tunnel and the IP address allocated to each UE, to send the uplink non-IP data. The IP address assigned by the UE of the IPized data;

A generating unit, configured to generate an uplink IP message of the uplink non-IP data according to the determined IP address allocated for the UE sending the uplink non-IP data and the stripped out uplink non-IP data;

A sending unit, configured to send the generated upstream IP packet of the upstream non-IP data to the data storage and forwarding center D-MEC through the IP network.

In a possible implementation manner, in the above-mentioned data transmission apparatus provided in the embodiment of the present invention, the generating unit is specifically configured to use the IP address allocated for the UE sending the uplink non-IP data as the source IP address, the IP address preconfigured by the D-MEC will be used as the destination IP address, and the upstream IP packet header information will be generated; the stripped upstream non-IP data and the generated upstream IP packet header information will be combined, An upstream IP packet of the upstream non-IP data is generated.

In a possible implementation manner, the above-mentioned data transmission apparatus provided in the embodiment of the present invention further includes: a configuration unit, configured to pre-configure the IP address of the D-MEC with the network access point APN as the granularity.

In a possible implementation manner, the above-mentioned data transmission device provided in the embodiment of the present invention further includes:

an allocation unit, configured to allocate an IP address to the UE when it is determined that the UE initiates attachment and establishes a connection with the public data network PDN of the core network;

The establishing unit is configured to establish a mapping relationship between the ID of the GTP tunnel corresponding to the UE and the IP address allocated to the UE according to the GTP tunnel corresponding to the UE.

In a possible implementation manner, in the above-mentioned data transmission device provided by the embodiment of the present invention, the receiving unit is further configured to receive the downlink IP packet sent by the D-MEC through the IP network, and convert the destination IP address and the downlink data is stripped from the downlink IP packet;

The determining unit is further configured to determine whether the destination IP address carried in the downlink IP message is the IP address allocated for the UE; when determining that the destination IP address carried in the downlink IP message is the IP address allocated for the UE , determine the ID of the GTP tunnel corresponding to the destination IP address carried in the downlink IP message according to the pre-established mapping relationship between the ID of each GTP tunnel and the IP address allocated for each UE;

The sending unit is further configured to send the downlink data to the corresponding UE through the GTP tunnel as downlink non-IP data.

An embodiment of the present invention further provides a packet data network gateway, including the above data transmission device.

The embodiment of the present invention also provides a data transmission system in the narrowband cellular Internet of Things, including: a packet data network gateway P-GW, a data storage and forwarding center D-MEC connected to the P-GW through an IP link, and a data server AS connected to the D-MEC through an IP link;

The P-GW is configured to receive the uplink non-IP data sent by the terminal UE through the GTP tunnel, and strip the uplink non-IP data from the GTP tunnel; according to the GTP tunnel receiving the uplink non-IP data The identification ID, and the mapping relationship between the ID of each GTP tunnel established in advance and the IP address allocated for each UE, determine the IP address allocated for the UE sending the uplink non-IP data; The IP address allocated by the UE of the uplink non-IP data and the stripped out uplink non-IP data generate an uplink IP message of the uplink non-IP data; the generated uplink non-IP data will be generated through the IP network The upstream IP packet of the data is sent to the D-MEC;

The D-MEC is configured to receive the uplink IP packet sent by the P-GW and forward it to the AS.

In a possible implementation manner, in the above data transmission system provided by the embodiment of the present invention, the D-MEC is further configured to receive the downlink IP packet sent by the AS and forward it to the P-GW;

The P-GW is further configured to receive the downlink IP packet sent by the D-MEC through the IP network, and strip the destination IP address and the downlink data from the downlink IP packet; determine that the downlink IP packet carries the Whether the destination IP address is the IP address allocated for the UE; when it is determined that the destination IP address carried in the downlink IP packet is the IP address allocated for the UE, according to the pre-established ID of each GTP tunnel and the IP address allocated for each UE The IP address mapping relationship determines the ID of the GTP tunnel corresponding to the destination IP address carried in the downlink IP packet; and the downlink data is sent to the corresponding UE through the GTP tunnel as downlink non-IP data.

The beneficial effects of the present invention are as follows:

A data transmission method, device, system, and packet data network gateway provided by embodiments of the present invention include: receiving uplink non-IP data sent by a terminal UE through a GTP tunnel, and stripping the uplink non-IP data from the GTP tunnel ; According to the identification ID of the GTP tunnel that receives the uplink non-IP data, and the mapping relationship between the ID of each GTP tunnel established in advance and the IP address allocated for each UE, determine the IP allocated for the UE that sends the uplink non-IP data. address; according to the determined IP address allocated for the UE that sends the uplink non-IP data and the stripped uplink non-IP data, an uplink IP message of the uplink non-IP data is generated; The uplink IP packet of the data is sent to the data storage and forwarding center D-MEC. According to the determined IP address allocated for the UE sending the uplink non-IP data and the stripped uplink non-IP data, an uplink IP packet of the uplink non-IP data is generated, so that the non-IP data can be stored in the IP network. Therefore, the transmission of non-IP data in NB-IoT is realized, and the compatibility with IP transmission is taken into account.

Description of drawings

1 is a schematic diagram of a narrowband cellular Internet of Things end-to-end data transmission model in the prior art;

2 is a flowchart of an uplink non-IP data transmission method for the narrowband cellular Internet of Things provided by an embodiment of the present invention;

3 is a flowchart of a downlink non-IP data transmission method for the narrowband cellular Internet of Things provided by an embodiment of the present invention;

4 is a schematic diagram of a data transmission device for narrowband cellular Internet of Things provided by an embodiment of the present invention;

5 is a schematic diagram of a path for transmitting data of the narrowband cellular Internet of Things through an IP network according to an embodiment of the present invention;

6 is one of schematic diagrams of an interface between a packet data network gateway and a data storage and forwarding center provided by an embodiment of the present invention;

7 is the second schematic diagram of an interface between a packet data network gateway and a data storage and forwarding center provided by an embodiment of the present invention;

8 is a schematic diagram of a path for non-IP data transmission based on a GTP tunnel provided by an embodiment of the present invention;

9 is a schematic diagram of data transmission of the narrowband cellular Internet of Things from a terminal UE to a packet data network gateway P-GW according to an embodiment of the present invention;

10 is a schematic diagram of a non-IP data packet of the narrowband cellular Internet of Things provided by an embodiment of the present invention;

FIG. 11 is a schematic diagram of an IP-based data packet of the narrowband cellular Internet of Things according to an embodiment of the present invention.

Detailed ways

Specific implementations of the service method and device of the customer service system provided by the embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

An embodiment of the present invention provides a data transmission method in a narrowband cellular Internet of Things, as shown in FIG. 2 , which may specifically include the following steps:

S201. Receive the uplink non-IP data sent by the terminal UE through the GTP tunnel, and strip the uplink non-IP data from the GTP tunnel;

S202. According to the ID of the GTP tunnel for receiving the uplink non-IP data, and the mapping relationship between the ID of each GTP tunnel and the IP address allocated to each UE, determine the ID allocated for the UE sending the uplink non-IP data. IP address;

S203, according to the determined IP address allocated for the UE sending the uplink non-IP data and the stripped uplink non-IP data, generate an uplink IP message of the uplink non-IP data;

S204. Send the generated upstream IP packet of the upstream non-IP data to the data storage and forwarding center D-MEC through the IP network.

Specifically, in the above-mentioned data transmission method provided by the embodiment of the present invention, since the determined IP address allocated for the UE sending the uplink non-IP data and the stripped uplink non-IP data, the uplink non-IP data is generated. The uplink IP message of the data enables non-IP data to be transmitted in the IP network. Therefore, the transmission of non-IP data in NB-IoT is realized, and the compatibility with IP transmission is taken into account.

In specific implementation, since the data sent from the UE can be transmitted to the core network through the GTP tunnel, in the above-mentioned data transmission method provided by the embodiment of the present invention, the ID of each GTP tunnel pre-established in step S202 is the same as that for each UE. The mapping relationship of the assigned IP addresses can be implemented in the following ways:

When it is determined that the UE initiates attachment and establishes a connection with the public data network PDN of the core network, assigning an IP address to the UE;

According to the GTP tunnel corresponding to the UE, a mapping relationship between the ID of the GTP tunnel corresponding to the UE and the IP address allocated to the UE is established.

Of course, when the data sent by the UE can also be transmitted to the core network through a transmission protocol other than the GTP tunnel, an IP address can be allocated to the UE in the same or similar manner as above, and a corresponding mapping relationship can be established, which is not limited here.

During specific implementation, in the above-mentioned data transmission method provided by the embodiment of the present invention, step S203 generates an uplink non-IP data according to the determined IP address allocated for the UE that sends the uplink non-IP data and the stripped uplink non-IP data. The upstream IP packets of IP-based data can be implemented in the following ways:

The IP address allocated for the UE that sends the uplink non-IP data is used as the source IP address, the IP address preconfigured for the D-MEC is used as the destination IP address, and the uplink IP packet header information is generated;

The stripped upstream non-IP data is combined with the generated upstream IP packet header information to generate an upstream IP packet of the upstream non-IP data.

Specifically, in the specific implementation of step S203 in the above data transmission method provided by the embodiment of the present invention, the IP address pre-configured for the D-MEC can be pre-configured by, for example, using the network access point APN as the granularity. The method of the IP address of the MEC is not limited to the above-mentioned method, and is not specifically limited. Preferably, in order to reduce the number of APNs, the number segment can be used as the granularity.

Specifically, the data transmission process includes uplink data transmission and downlink data transmission. When the non-IP data is transmitted as uplink data in the IP network, the non-IP data carries the IP address allocated for the UE as the source IP address, and Taking the pre-configured IP address of the D-MEC as the upstream IP packet header information of the destination IP address, therefore, in the above-mentioned data transmission method provided by the embodiment of the present invention, as shown in FIG. 3, the following steps may also be included to realize Transmission of non-IP data as downlink data in IP network:

S301. Receive the downlink IP packet sent by the D-MEC through the IP network, and strip the destination IP address and the downlink data from the downlink IP packet;

S302, determine whether the destination IP address carried in the downlink IP packet is the IP address allocated for the UE;

S303. When it is determined that the destination IP address carried in the downlink IP packet is the IP address allocated for the UE, determine the IP address carried in the downlink IP packet according to the pre-established mapping relationship between the IDs of each GTP tunnel and the IP addresses allocated for each UE The ID of the GTP tunnel corresponding to the destination IP address;

S304. Send the downlink data to the corresponding UE through the GTP tunnel as downlink non-IP data.

Based on the same inventive concept, an embodiment of the present invention also provides a data transmission device in the narrowband cellular Internet of Things. Since the principle of solving the problem of the data transmission device is similar to the above-mentioned data transmission method, the implementation of the data transmission device can be Refer to the implementation of the above-mentioned data transmission method, and the repetition will not be repeated.

A data transmission device in a narrowband cellular Internet of Things provided by an embodiment of the present invention, as shown in FIG. 4 , may specifically include:

A receiving unit 401, configured to receive the uplink non-IP data sent by the terminal UE through the GTP tunnel, and strip the uplink non-IP data from the GTP tunnel;

The determining unit 402 is configured to determine, according to the identification ID of the GTP tunnel that receives the uplink non-IP data, and the pre-established mapping relationship between the ID of each GTP tunnel and the IP address allocated for each UE, to send the uplink non-IP data The IP address assigned by the UE;

The generating unit 403 is used to generate the uplink IP message of the uplink non-IP data according to the determined IP address allocated for the UE that sends the uplink non-IP data and the stripped uplink non-IP data;

The sending unit 404 is configured to send the generated upstream IP packet of the upstream non-IP data to the data storage and forwarding center D-MEC through the IP network.

Specifically, in the above-mentioned data transmission apparatus provided by the embodiment of the present invention, the generating unit 403 may be specifically configured to use the IP address allocated for the UE that sends the uplink non-IP data as the source IP address, and will pre-configure the D-MEC The IP address is used as the destination IP address, and the upstream IP packet header information is generated; the stripped upstream non-IP data and the generated upstream IP packet header information are combined to generate the upstream non-IP data upstream IP packet.

During specific implementation, the above-mentioned data transmission apparatus provided in the embodiment of the present invention may further include: a configuration unit 405, configured to pre-configure the IP address of the D-MEC with the network access point APN as the granularity.

During specific implementation, the above-mentioned data transmission device provided in the embodiment of the present invention may further include:

an allocation unit 406, configured to allocate an IP address to the UE when it is determined that the UE initiates attachment and establishes a connection with the public data network PDN of the core network;

The establishing unit 407 is configured to establish a mapping relationship between the ID of the GTP tunnel corresponding to the UE and the IP address allocated to the UE according to the GTP tunnel corresponding to the UE.

Specifically, in the above-mentioned data transmission apparatus provided in the embodiment of the present invention, the receiving unit 401 may also be configured to receive a downlink IP packet sent by the D-MEC through the IP network, and transfer the destination IP address and the downlink data from the downlink IP packet from the downlink IP packet. stripping;

The determining unit 402 can also be used to determine whether the destination IP address carried in the downlink IP message is the IP address allocated for the UE; when determining that the destination IP address carried in the downlink IP message is the IP address allocated for the UE, according to the pre-established IP address The mapping relationship between the ID of each GTP tunnel and the IP address allocated for each UE, determine the ID of the GTP tunnel corresponding to the destination IP address carried by the downlink IP message;

The sending unit 404 may also be configured to send the downlink data as the downlink non-IP data to the corresponding UE through the GTP tunnel.

Based on the same inventive concept, an embodiment of the present invention also provides a packet data network gateway. Since the principle of solving the problem of the packet data network gateway is similar to the above-mentioned data transmission device, the implementation of the packet data network gateway can refer to the above data The implementation of the transmission device will not be repeated here.

A packet data network gateway provided by an embodiment of the present invention may include the above-mentioned data transmission device.

Based on the same inventive concept, the embodiment of the present invention also provides a data transmission system in the narrowband cellular Internet of Things, because the principle of solving the problem of the data transmission system in the narrowband cellular Internet of Things is similar to the above-mentioned packet data network gateway, therefore, For the implementation of the data transmission system in the narrowband cellular Internet of Things, reference may be made to the above-mentioned implementation of the packet data network gateway, and the repetition will not be repeated.

A data transmission system in a narrowband cellular Internet of Things provided by an embodiment of the present invention, as shown in FIG. 5 , may specifically include: a packet data network gateway P-GW, and a data storage and forwarding center connected to the P-GW through an IP link D-MEC, and data server AS connected to D-MEC through IP link;

The P-GW is used to receive the uplink non-IP data sent by the terminal UE through the GTP tunnel, and strip the uplink non-IP data from the GTP tunnel; according to the identification ID of the GTP tunnel receiving the uplink non-IP data, and the pre-established The mapping relationship between the ID of each GTP tunnel and the IP address allocated to each UE determines the IP address allocated for the UE sending uplink non-IP data; according to the determined IP address allocated for the UE sending uplink non-IP data and the stripped uplink non-IP data, to generate an uplink IP packet of the uplink non-IP data; send the generated uplink IP packet of the uplink non-IP data to the D-MEC through the IP network;

The D-MEC is used to receive the upstream IP packets sent by the P-GW and forward them to the AS.

During specific implementation, in the above-mentioned data transmission system provided by the embodiment of the present invention, the D-MEC can also be used to receive the downlink IP message sent by the AS and forward it to the P-GW;

The P-GW can also be used to receive downlink IP packets sent by the D-MEC through the IP network, and strip the destination IP address and downlink data from the downlink IP packets; determine whether the destination IP address carried in the downlink IP packets is IP address allocated by the UE; when it is determined that the destination IP address carried in the downlink IP packet is the IP address allocated for the UE, the downlink IP address is determined according to the pre-established mapping relationship between the ID of each GTP tunnel and the IP address allocated for each UE The ID of the GTP tunnel corresponding to the destination IP address carried in the packet; the downlink data is sent to the corresponding UE through the GTP tunnel as downlink non-IP data.

It can be seen that the message exchange format between the P-GW and the D-MEC is a standard IP protocol message, and the destination IP address is the IP address of the D-MEC during uplink data. After replacement, it is forwarded to other corresponding services; the destination IP address of the downlink data is the IP address of the UE allocated for the UE, and the P-GW forwards the downlink data to the corresponding UE.

Specifically, in the NB-IoT network, the interface between the D-MEC and the core network is concentrated on the network element P-GW of the core network. In the above data transmission system provided by the embodiment of the present invention, the P-GW and the D-MEC The interface between SGi is shown in Figure 6 and Figure 7. The SGi interface is the interface IFd2 between the P-GW and the D-MEC, and its basic requirements follow the 3GPP standard 29.061. Preferably, the interface SGi at least needs to meet the following conditions: it can support DHCP, Radius protocol, and tunneling protocols such as IPSEC, L2TP and GRE, and can support IPv6/IPv4 dual stack; can provide physical interfaces such as FE and GE, and can It needs to be expanded into multiple physical interfaces; it can be physically separated from Gn/S5/S8, billing, and network management interfaces; it can support more than 3 physical interfaces.

In order to better understand the technical solution of the present invention, the embodiments of the present invention provide specific embodiments of using the above data transmission method, device, system and packet data network gateway to transmit data packets under the NB-IoT network, as shown in FIGS. 8 to 8 . 11 shown. The transmission path of data packets in the NB-IoT network can be divided into three segments, as shown in Figure 8, the first segment is the transmission between the UE and the P-GW, and the second segment is between the P-GW and the D-MEC The third segment is the transmission between the D-MEC and the AS.

The transmission mode of the non-IP-based data packet between the UE and the P-GW in the first segment is basically the same as the transmission mode of the IP-based data packet. As shown in FIG. 9 , both non-IP-based data packets and IP-based data packets can be transmitted through network-attached storage NAS signaling/tunneling. The only difference between the two is that the types of PDN bearers are different, and the NB-IoT network does not assign IP addresses to UEs using non-IP bearers.

Figure 10 shows the transmission process of the non-IP data packet between the P-GW and the D-MEC in the second segment, and the transmission process between the D-MEC and the AS in the third segment. In order to ensure that the non-IP data packets can be transmitted between the second segment P-GW and D-MEC through the IP network, the IP address of the D-MEC can be pre-configured on the P-GW with APN as the granularity, wherein, The granularity can be number segments. When it is determined that the UE initiates attachment and establishes a connection with the PDN of the core network, the P-GW allocates an IP address to the UE; and establishes a mapping relationship between the ID of the GTP tunnel corresponding to the UE and the IP address allocated to the UE according to the GTP tunnel corresponding to the UE .

During the uplink transmission of non-IP packets from P-GW to D-MEC and then from D-MEC to AS through the IP network, after P-GW receives the non-IP packets from UE side, it sends them from GTP It is stripped in the tunnel, and the uplink non-IP data packet stripped from the GTP tunnel is used as the content of the message; the IP address allocated to the UE that sends the uplink non-IP data packet is the source address, and the IP address of the D-MEC is used as the source address. The destination address generates the upstream IP packet header information; combines the stripped upstream non-IP packet and the upstream IP packet header information to generate the upstream IP packet of the upstream non-IP packet; The upstream IP packets of the non-IP packets are sent to the D-MEC.

After receiving the uplink message sent by the P-GW, the D-MEC, on the one hand, parses the content of the non-IP data packet and the user ID in it, and establishes the mapping relationship between the user ID and the IP address assigned to the UE, so as to Sent in downstream packets. On the other hand, use the upstream non-IP packet stripped from the GTP tunnel as the content of the message; use the IP address of the D-MEC as the source address, and use the IP address of the AS as the destination address to generate the upstream IP header information again; Combine the stripped upstream non-IP packet and the regenerated upstream IP packet header information to regenerate the upstream IP packet of the upstream non-IP packet; The upstream IP packets are sent to the AS.

After receiving the upstream IP packet of the regenerated upstream non-IP packet sent by the D-MEC, the AS converts the source address in the received upstream packet sent by the D-MEC to the IP address of the AS, and converts the destination IP address to the IP address of the AS. The address is converted into the IP address of the D-MEC, so that the downlink data packets can be sent.

During the downlink transmission of non-IP data packets from AS to D-MEC and then from D-MEC to P-GW through the IP network, after D-MEC receives the response data packets of the uplink non-IP data packets sent by AS , take the response packet of the uplink non-IP data packet as the content of the message; take the IP address of the D-MEC as the source address, and generate the downlink report for the IP address assigned by the UE that sends the uplink non-IP data packet as the destination address Header information; combine the response data packet of the upstream non-IP data packet and the downlink IP packet header information to generate the downlink IP packet of the downlink non-IP data packet; then convert the generated downlink non-IP data packet through the IP network The downlink IP packet, and the mapping relationship between the user ID and the IP address allocated for the UE established in the uplink transmission process of the non-IP-based data packet are sent to the P-GW.

After receiving the downlink packet sent by the D-MEC and the mapping relationship between the user ID and the IP address assigned to the UE established during the uplink transmission of the non-IP packet, the P-GW parses the uplink non-IP packet in the downlink packet. The response data packet of the data packet, and the user ID in the mapping relationship between the user ID and the IP address allocated to the UE established during the uplink transmission of the non-IP data packet. And according to the user ID, the parsed response data packet is sent to the corresponding terminal.

It can be seen that in the above-mentioned data packet transmission method, device, system and packet data packet network gateway provided by the embodiment of the present invention, by translating non-IP data packets into IP data packets on the P-GW, so that in the P-GW After the GW, the IP network in the prior art can be used for data packet transmission, thereby greatly improving the multiplexability of the IP path, improving the overall efficiency of the network, and reducing the complexity of network construction.

Figure 11 shows the transmission process of the IP-based data packet between the P-GW and the D-MEC in the second segment, and the transmission process between the D-MEC and the AS in the third segment. Since the NB-IoT network assigns an IP address to the UE using IP bearer during the first segment of the transmission process of the IP-based data packet between the UE and the P-GW, the IP-based data packet does not need to be processed on the P-GW. The translation can be carried out through the IP network in the transmission path after the P-GW.

After the P-GW receives the IPized data packet from the UE side, it can directly send it to the D-MEC through the IP network. After receiving the uplink message sent by the P-GW, the D-MEC, on the one hand, parses the content of the IP-based data packet and the user ID in it, and establishes the mapping relationship between the user ID and the IP address of the UE, so as to facilitate the downlink data package sent. On the other hand, the source address of the upstream IP packet is converted to the IP address of the D-MEC, and the destination address is converted to the IP address of the AS. It is then sent to the AS over the IP network. After receiving the upstream IP-based data packet sent by the D-MEC, the AS converts the source address in the received upstream IP-based data packet to the IP address of the AS, and converts the destination address to the IP address of the D-MEC, so as to facilitate Downlink data packets are sent.

During the downlink transmission of IP-based data packets from AS to D-MEC and then from D-MEC to P-GW through the IP network, after D-MEC receives the down-link IP-based data packets sent by AS, the downlink IP-based data The source address of the packet is converted to the IP address of the D-MEC, and the destination address is converted to the IP address of the UE. The downlink IP-based data packet whose source address and destination address have been converted, and the mapping relationship between the user ID and the UE's IP address established during the uplink transmission of the IP-based data packet, are sent to the P-GW through the IP network. After receiving the downlink IP-based data packet sent by the D-MEC and the mapping relationship between the user ID and the UE's IP address established during the uplink transmission of the IP-based data packet, the P-GW parses the uplink transmission of the IP-based data packet The user ID in the mapping relationship between the user ID and the IP address of the UE established in the process. And according to the user ID, the downlink IP-based data packet is sent to the corresponding UE.

The above-mentioned data transmission method, device, system, and packet data network gateway provided by the embodiments of the present invention include: receiving uplink non-IP data sent by a terminal UE through a GTP tunnel, and stripping the uplink non-IP data from the GTP tunnel; According to the ID of the GTP tunnel that receives the uplink non-IP data, and the mapping relationship between the pre-established IDs of each GTP tunnel and the IP addresses allocated to each UE, determine the IP address allocated to the UE that sends the uplink non-IP data ; According to the determined IP address of the UE for sending the uplink non-IP data and the stripped uplink non-IP data, generate the uplink IP message of the uplink non-IP data; By the IP network, the generated uplink non-IP data will be generated. The upstream IP packet of the data is sent to the data storage and forwarding center D-MEC. According to the determined IP address allocated for the UE sending the uplink non-IP data and the stripped uplink non-IP data, an uplink IP packet of the uplink non-IP data is generated, so that the non-IP data can be stored in the IP network. Therefore, the transmission of non-IP data in NB-IoT is realized, and the compatibility with IP transmission is taken into account.

In addition, due to the above-mentioned data transmission method, device, system and packet data network gateway provided by the embodiments of the present invention, while realizing the transmission of non-IP data in NB-IoT, it can have good performance with IP transmission in the prior art. Therefore, the above-mentioned data transmission method, device, system and packet data network gateway provided by the embodiments of the present invention are easy to implement, and have good commercial value and technical barrier value.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit and scope of the invention. Thus, provided that these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims (11)

1. A data transmission method in a narrowband cellular Internet of things is characterized by comprising the following steps:

receiving uplink non-IP data sent by a terminal UE through a GTP tunnel, and stripping the uplink non-IP data from the GTP tunnel;

determining an IP address allocated to the UE for sending the uplink non-IP data according to the identification ID of the GTP tunnel for receiving the uplink non-IP data and the pre-established mapping relation between the ID of each GTP tunnel and the IP address allocated to each UE;

generating an uplink IP message of the uplink non-IP data according to the determined IP address distributed to the UE sending the uplink non-IP data and the stripped uplink non-IP data;

sending the generated uplink IP message of the uplink non-IP data to a data storage and forwarding center D-MEC through an IP network;

the generating an uplink IP packet of the uplink non-IP data according to the determined IP address allocated to the UE that sends the uplink non-IP data and the stripped uplink non-IP data specifically includes:

using the IP address allocated to the UE for sending the uplink non-IP data as a source IP address, and using an IP address pre-configured for the D-MEC as a destination IP address to generate uplink IP message header information;

and combining the stripped uplink non-IP data with the generated uplink IP message header information to generate an uplink IP message of the uplink non-IP data.

2. The data transmission method of claim 1, further comprising:

and pre-configuring the IP address of the D-MEC by taking the APN (access point name) as granularity.

3. The data transmission method according to claim 1 or 2, further comprising:

when determining that the UE initiates attachment and establishes connection with a Public Data Network (PDN) of a core network, allocating an IP address for the UE;

and establishing a mapping relation between the ID of the GTP tunnel corresponding to the UE and the IP address allocated to the UE according to the GTP tunnel corresponding to the UE.

4. The data transmission method of claim 1, further comprising:

receiving a downlink IP message sent by the D-MEC through an IP network, and stripping a target IP address and downlink data from the downlink IP message;

determining whether a destination IP address carried by the downlink IP message is an IP address allocated to the UE;

when determining that the target IP address carried by the downlink IP message is the IP address allocated to the UE, determining the ID of the GTP tunnel corresponding to the target IP address carried by the downlink IP message according to the pre-established mapping relation between the ID of each GTP tunnel and the IP address allocated to each UE;

and sending the downlink data serving as downlink non-IP data to corresponding UE through the GTP tunnel.

5. A data transmission device in a narrowband cellular Internet of things is characterized by comprising:

a receiving unit, configured to receive uplink non-IP data sent by a terminal UE through a GTP tunnel, and strip the uplink non-IP data from the GTP tunnel;

a determining unit, configured to determine, according to an identifier ID of a GTP tunnel that receives the uplink non-IP data and a mapping relationship between IDs of GTP tunnels established in advance and IP addresses allocated to UEs, an IP address allocated to the UE that sends the uplink non-IP data;

a generating unit, configured to generate an uplink IP packet of the uplink non-IP data according to the determined IP address allocated to the UE that sends the uplink non-IP data and the stripped uplink non-IP data;

a sending unit, configured to send the generated uplink IP packet of the uplink non-IP data to a data store-and-forward center D-MEC through an IP network;

the generating unit is specifically configured to generate uplink IP packet header information by using the IP address allocated to the UE that sends the uplink non-IP data as a source IP address and using an IP address preconfigured for the D-MEC as a destination IP address; and combining the stripped uplink non-IP data with the generated uplink IP message header information to generate an uplink IP message of the uplink non-IP data.

6. The data transmission apparatus of claim 5, further comprising: and the configuration unit is used for pre-configuring the IP address of the D-MEC by taking the APN (access point name) as granularity.

7. The data transmission apparatus according to claim 5 or 6, further comprising:

the allocation unit is used for allocating an IP address for the UE when determining that the UE initiates attachment and establishes connection with a Public Data Network (PDN) of a core network;

and the establishing unit is used for establishing the mapping relation between the ID of the GTP tunnel corresponding to the UE and the IP address allocated to the UE according to the GTP tunnel corresponding to the UE.

8. The data transmission apparatus of claim 5, wherein:

the receiving unit is further configured to receive a downlink IP packet sent by the D-MEC through an IP network, and strip a destination IP address and downlink data from the downlink IP packet;

the determining unit is further configured to determine whether a destination IP address carried in the downlink IP packet is an IP address allocated to the UE; when determining that the target IP address carried by the downlink IP message is the IP address allocated to the UE, determining the ID of the GTP tunnel corresponding to the target IP address carried by the downlink IP message according to the pre-established mapping relation between the ID of each GTP tunnel and the IP address allocated to each UE;

and the sending unit is further configured to send the downlink data to the corresponding UE through the GTP tunnel as downlink non-IP data.

9. A packet data network gateway, characterized by: comprising a data transmission device according to any of claims 5-8.

10. A data transmission system in a narrowband cellular Internet of things is characterized by comprising: the system comprises a packet data network gateway P-GW, a data storage and forwarding center D-MEC connected with the P-GW through an IP link, and a data server AS connected with the D-MEC through the IP link;

the P-GW is used for receiving uplink non-IP data sent by the terminal UE through a GTP tunnel and stripping the uplink non-IP data from the GTP tunnel; determining an IP address allocated to the UE for sending the uplink non-IP data according to the identification ID of the GTP tunnel for receiving the uplink non-IP data and the pre-established mapping relation between the ID of each GTP tunnel and the IP address allocated to each UE; generating an uplink IP message of the uplink non-IP data according to the determined IP address distributed to the UE sending the uplink non-IP data and the stripped uplink non-IP data; sending the generated uplink IP message of the uplink non-IP data to the D-MEC through an IP network;

the D-MEC is used for receiving the uplink IP message sent by the P-GW and then forwarding the uplink IP message to the AS;

the P-GW is specifically configured to generate uplink IP packet header information by using the IP address allocated to the UE that sends the uplink non-IP data as a source IP address and using an IP address preconfigured for the D-MEC as a destination IP address; and combining the stripped uplink non-IP data with the generated uplink IP message header information to generate an uplink IP message of the uplink non-IP data.

11. The data transmission system according to claim 10, wherein the D-MEC is further configured to receive a downlink IP packet sent by the AS and forward the downlink IP packet to the P-GW;

the P-GW is also used for receiving a downlink IP message sent by the D-MEC through an IP network and stripping a target IP address and downlink data from the downlink IP message; determining whether a destination IP address carried by the downlink IP message is an IP address allocated to the UE; when determining that the target IP address carried by the downlink IP message is the IP address allocated to the UE, determining the ID of the GTP tunnel corresponding to the target IP address carried by the downlink IP message according to the pre-established mapping relation between the ID of each GTP tunnel and the IP address allocated to each UE; and sending the downlink data serving as downlink non-IP data to corresponding UE through the GTP tunnel.

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