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

Data transmission method, device and system and packet data network gateway Download PDF

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CN108617009B
CN108617009B CN201611145600.2A CN201611145600A CN108617009B CN 108617009 B CN108617009 B CN 108617009B CN 201611145600 A CN201611145600 A CN 201611145600A CN 108617009 B CN108617009 B CN 108617009B
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data
uplink
address
downlink
message
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CN108617009A (en
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刘琨
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China Mobile Communications Group Co Ltd
China Mobile Communications Ltd Research Institute
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China Mobile Communications Group Co Ltd
China Mobile Communications Ltd Research Institute
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L67/00—Network arrangements or protocols for supporting network services or applications
    • H04L67/01—Protocols
    • H04L67/12—Protocols specially adapted for proprietary or special-purpose networking environments, e.g. medical networks, sensor networks, networks in vehicles or remote metering networks

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Abstract

The invention discloses a data transmission method, a device, a system and a packet data network gateway, wherein the method receives uplink non-IP data sent by a terminal UE through a GTP tunnel and strips 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 of the GTP tunnel for receiving the uplink non-IP data and the mapping relation between the identification of each GTP tunnel and the IP address allocated to each UE, which is established in advance; generating an uplink IP message of the uplink non-IP data according to the determined IP address distributed to the UE for sending the uplink non-IP data and the stripped uplink non-IP data; and sending the generated uplink IP message of the uplink non-IP data to a data storage and forwarding center through an IP network. Therefore, the transmission of non-IP data in the IP network is realized, and the compatibility with IP transmission is considered.

Description

Data transmission method, device and system and packet data network gateway
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a data transmission method, apparatus, system, and packet data network gateway.
Background
Narrow-Band cellular Internet of Things (NB-IoT) is an emerging technology in the field of Internet of Things (IoT), supports cellular data connection of Low-Power devices in a Wide Area network (wan), and is also called Low Power Wide Area network (LPWA). NB-IoT support standby times are long, and the battery life of typical NB-IoT devices can be increased to at least 10 years. While NB-IoT can also provide very comprehensive indoor cellular data connection coverage. In addition, NB-IoT is constructed in a cellular network, consumes only about 180KHz bandwidth, and can be directly deployed in a Global System for Mobile Communication (GSM) network, a Universal Mobile Telecommunications System (UMTS) network, or a Long Term Evolution (LTE) network, so as to reduce deployment cost and achieve smooth upgrade.
At present, a mainstream scheme of an end-to-end communication process from an NB-IoT terminal to a cloud platform is still an IP scheme, that is, a signaling plane of a core network is used to carry an Internet Protocol (IP) data packet in a signaling for transmission, which is not different from the traditional Internet information transmission. Specifically, as shown in fig. 1, Data sent by the terminal UE is transmitted to a Data storing and forwarding center (D-MEC) of the Data platform 101 under the narrowband cellular internet of things, and a path passes through the base station 102(Evolved Node B, eNode-B), a serving gateway (S-GW) of the core Network 103, and a Packet Data Network gateway (P-GW).
For NB-IoT, The 3rd Generation Mobile Communications (3 GPP) also provides a non-IP transmission scheme in addition to The traditional IP transmission. Because data in a non-IP transmission mode is not carried in an IP mode, a conventional IP transmission link is ineffective in such a mode. However, no substantial solution is provided for non-IP transmission in 3GPP, and therefore, how to solve the problem of non-IP data transmission in NB-IoT while considering compatibility with IP transmission is a technical problem that needs to be solved at present.
Disclosure of Invention
Embodiments of the present invention provide a data transmission method, apparatus, system and packet data network gateway, so as to solve the problem in the prior art how to solve the transmission of non-IP data in NB-IoT and consider the compatibility with IP transmission.
The embodiment of the invention provides a data transmission method in a narrowband cellular Internet of things, which comprises 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;
and 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.
In a possible implementation manner, in the data transmission method provided in an embodiment of the present invention, 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.
In a possible implementation manner, in the data transmission method provided in the embodiment of the present invention, the method further includes:
and pre-configuring the IP address of the D-MEC by taking the APN (access point name) as granularity.
In a possible implementation manner, in the data transmission method provided in the embodiment of the present invention, the method further includes:
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.
In a possible implementation manner, in the data transmission method provided in the embodiment of the present invention, the method further includes:
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.
The embodiment of the invention also provides a data transmission device in the narrowband cellular internet of things, which comprises:
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;
and the sending unit is used for 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.
In a possible implementation manner, in the data transmission apparatus provided in an embodiment of the present invention, the generating unit is specifically configured to use the IP address allocated to the UE that sends the uplink non-IP data as a source IP address, and use an IP address preconfigured for the D-MEC as a destination IP address, so as to generate uplink IP packet 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.
In a possible implementation manner, in the data transmission apparatus provided in the embodiment of the present invention, the data transmission apparatus further includes: 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.
In a possible implementation manner, in the data transmission apparatus provided in the embodiment of the present invention, the data transmission apparatus further includes:
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.
In a possible implementation manner, in the data transmission apparatus provided in the embodiment of the present invention, 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.
The embodiment of the invention also provides a packet data network gateway which comprises the data transmission device.
The embodiment of the invention also provides a data transmission system in the narrowband cellular internet of things, which comprises: 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;
and 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.
In a possible implementation manner, in the data transmission system provided in the embodiment of the present invention, 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.
The invention has the following beneficial effects:
the embodiment of the invention provides a data transmission method, a device and a system and a packet data network gateway, wherein the method comprises the following steps: receiving uplink non-IP data sent by the terminal UE through the 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 mapping relation between the ID of each GTP tunnel and the IP address allocated to each UE, which is established in advance; generating an uplink IP message of the uplink non-IP data according to the determined IP address distributed to the UE for sending the uplink non-IP data and the stripped uplink non-IP data; and 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 uplink IP message of the uplink non-IP data is generated according to the determined IP address allocated to the UE for sending the uplink non-IP data and the stripped uplink non-IP data, so that the non-IP data can be transmitted in an IP network, and therefore, the transmission of the non-IP data in NB-IoT is realized, and meanwhile, the compatibility with IP transmission is considered.
Drawings
Fig. 1 is a schematic diagram of an end-to-end data transmission model of a narrowband cellular internet of things in the prior art;
fig. 2 is a flowchart of an uplink non-IP data transmission method of a narrowband cellular internet of things according to an embodiment of the present invention;
fig. 3 is a flowchart of a downlink non-IP data transmission method of a narrowband cellular internet of things according to an embodiment of the present invention;
fig. 4 is a schematic diagram of a data transmission device of a narrowband cellular internet of things according to an embodiment of the present invention;
fig. 5 is a schematic path diagram of data transmission of the narrowband cellular internet of things through an IP network according to the embodiment of the present invention;
fig. 6 is one of schematic diagrams of an interface between a packet data network gateway and a data store-and-forward center according to an embodiment of the present invention;
fig. 7 is a second schematic diagram of an interface between a packet data network gateway and a data store-and-forward center according to the embodiment of the present invention;
fig. 8 is a schematic path diagram of non-IP data transmission based on a GTP tunnel according to an embodiment of the present invention;
fig. 9 is a schematic diagram of data transmission from a terminal UE to a packet data network gateway P-GW in a narrowband cellular internet of things according to an embodiment of the present invention;
fig. 10 is a schematic diagram of a non-IP data packet of a narrowband cellular internet of things according to an embodiment of the present invention;
fig. 11 is a schematic diagram of an IP packet of the narrowband cellular internet of things according to the embodiment of the present invention.
Detailed Description
The following describes in detail specific embodiments of a service method and a service device of a customer service system according to an embodiment of the present invention with reference to the accompanying drawings.
The embodiment of the invention provides a data transmission method in a narrowband cellular internet of things, which specifically comprises the following steps as shown in fig. 2:
s201, 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;
s202, 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 mapping relation between the pre-established ID of each GTP tunnel and the IP address allocated to each UE;
s203, generating an uplink IP message of the uplink non-IP data according to the determined IP address distributed to the UE for sending the uplink non-IP data and the stripped uplink non-IP data;
and S204, 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.
Specifically, in the data transmission method provided in the embodiment of the present invention, because the uplink IP packet of the uplink non-IP data is generated according to the determined IP address allocated to the UE that sends the uplink non-IP data and the stripped uplink non-IP data, the non-IP data can be transmitted in the IP network, so that the transmission of the non-IP data in the NB-IoT is implemented, and meanwhile, the compatibility with the IP transmission is considered.
In specific implementation, since data sent from the UE may be transmitted to the core network through the GTP tunnel, in the data transmission method provided in the embodiment of the present invention, the mapping relationship between the ID of each GTP tunnel and the IP address allocated to each UE, which is pre-established in step S202, may be implemented in the following manner:
when determining that 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.
Of course, when the data sent by the UE may also be transmitted to the core network via a transmission protocol other than the GTP tunnel, the IP address may be allocated to the UE in the same or similar manner as described above, and a corresponding mapping relationship is established, which is not limited herein.
In a specific implementation, in the data transmission method provided in the embodiment of the present invention, step S203 generates an uplink IP packet of 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, which may specifically be implemented in the following manner:
using an IP address distributed for UE sending uplink non-IP data as a source IP address, and using an IP address pre-configured for 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.
Specifically, the IP address preconfigured for the D-MEC in the specific implementation manner of step S203 in the data transmission method provided in the embodiment of the present invention may be implemented in a manner of, for example, using a network access point APN as a granularity, and preconfigured the IP address of the D-MEC, but is not limited to the foregoing manner, and is not limited specifically. Preferably, to reduce the number of APNs, the number segments may be used as granularity.
Specifically, the data transmission process includes uplink data transmission and downlink data transmission, and when non-IP data is transmitted in an IP network as uplink data, the non-IP data carries an uplink IP packet header information that takes an IP address allocated to the UE as a source IP address and an IP address pre-configured for the D-MEC as a destination IP address, so that in the data transmission method provided in the embodiment of the present invention, as shown in fig. 3, the following steps may be further included to implement transmission of the non-IP data in the IP network as downlink data:
s301, 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;
s302, determining whether a destination IP address carried by a downlink IP message is an IP address allocated to the UE;
s303, 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 S304, sending the downlink data serving as downlink non-IP data to the corresponding UE through the GTP tunnel.
Based on the same inventive concept, the embodiment of the invention also provides a data transmission device in the narrowband cellular internet of things, and as the principle of solving the problem of the data transmission device is similar to that of the data transmission method, the implementation of the data transmission device can refer to the implementation of the data transmission method, and repeated parts are not described again.
As shown in fig. 4, the data transmission device in the narrowband cellular internet of things provided by the embodiment of the present invention specifically includes:
a receiving unit 401, configured to receive uplink non-IP data sent by the terminal UE through the GTP tunnel, and strip the uplink non-IP data from the GTP tunnel;
a determining unit 402, configured to determine, according to the identification ID of the GTP tunnel receiving the uplink non-IP data and a mapping relationship between the ID of each GTP tunnel and the IP address allocated to each UE, an IP address allocated to the UE that sends the uplink non-IP data;
a generating unit 403, 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 404, configured to send the generated uplink IP packet of the uplink non-IP data to the data store-and-forward center D-MEC through the IP network.
Specifically, in the data transmission apparatus provided in the embodiment of the present invention, the generating unit 403 may be specifically configured to use an IP address allocated to the UE that sends the uplink non-IP data as a source IP address, and use an IP address preconfigured for the D-MEC as a destination IP address, so as to generate uplink IP packet 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.
In specific implementation, the data transmission apparatus provided in the embodiment of the present invention may further include: a configuration unit 405, configured to pre-configure an IP address of the D-MEC with the APN as a granularity.
In specific implementation, the data transmission apparatus provided in the embodiment of the present invention may further include:
an allocating 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 a public data network PDN of a core network;
the establishing unit 407 is configured to establish a mapping relationship between an ID of a GTP tunnel corresponding to the UE and an IP address allocated to the UE according to the GTP tunnel corresponding to the UE.
Specifically, in the data transmission apparatus provided in the embodiment of the present invention, the receiving unit 401 may be 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 402 may further be 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;
the sending unit 404 may be further configured to send the downlink data to the corresponding UE as downlink non-IP data through a GTP tunnel.
Based on the same inventive concept, embodiments of the present invention further provide a packet data network gateway, and as the principle of solving the problem of the packet data network gateway is similar to that of the data transmission apparatus, the implementation of the packet data network gateway may refer to the implementation of the data transmission apparatus, and repeated details are not described again.
The packet data network gateway provided by the embodiment of the invention can comprise the data transmission device.
Based on the same inventive concept, the embodiment of the invention also provides a data transmission system in the narrowband cellular internet of things, and as the principle of solving the problem of the data transmission system in the narrowband cellular internet of things is similar to that of the packet data network gateway, the implementation of the data transmission system in the narrowband cellular internet of things can refer to the implementation of the packet data network gateway, and repeated details are omitted.
As shown in fig. 5, the data transmission system in the narrowband cellular internet of things provided by the embodiment of the present invention specifically includes: 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 the 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 mapping relation between the ID of each GTP tunnel and the IP address allocated to each UE, which is established in advance; generating an uplink IP message of the uplink non-IP data according to the determined IP address distributed to the UE for 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;
and 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.
In specific implementation, in the data transmission system provided in the embodiment of the present invention, the D-MEC may also be configured to receive a downlink IP packet sent by the AS and forward the downlink IP packet to the P-GW;
the P-GW can also be 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 a 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 the corresponding UE through the GTP tunnel.
It can be seen that the message interaction format between the P-GW and the D-MEC is a standard IP protocol message, the destination IP address is the IP address of the D-MEC during uplink data, and the D-MEC replaces the destination address according to the routing table and forwards the destination address to the corresponding other service; when the data is downlink, the destination IP address is the IP address of the UE allocated to the UE, and the P-GW forwards the downlink data to the corresponding UE.
Specifically, in the NB-IoT network, the interfaces between the D-MEC and the core network are concentrated on the network element P-GW of the core network, and in the above data transmission system provided in the embodiment of the present invention, the interface SGi between the P-GW and the D-MEC is as shown in fig. 6 and fig. 7. The SGi interface is the interface IFd2 between the P-GW and the D-MEC, which basically requires compliance with 3GPP standard 29.061. Preferably, the interface SGi needs to satisfy at least the following conditions: the system can support DHCP, Radius protocol, IPSEC, L2TP, GRE and other tunneling protocols, and can support IPv6/IPv4 dual stack; physical interfaces such as FE, GE and the like can be provided, and the physical interfaces can be expanded into a plurality of physical interfaces according to requirements; can realize physical separation with Gn/S5/S8, charging, network management interface; more than 3 physical interfaces may be supported.
In order to better understand the technical solution of the present invention, embodiments of the present invention provide specific embodiments that use the above data transmission method, apparatus, system and packet data network gateway to transmit data packets in an NB-IoT network, as shown in fig. 8 to fig. 11. The path of the data packet transmitted under the NB-IoT network can be divided into three segments, AS shown in fig. 8, a first segment is transmission between the UE and the P-GW, a second segment is transmission between the P-GW and the D-MEC, and a third segment is transmission between the D-MEC and the AS.
The transmission mode of the non-IP data packet between the first stage UE and the P-GW is basically the same as the transmission mode of the IP data packet. As shown in fig. 9, both non-IP and IP packets may be transported over the network attached storage NAS signaling/tunnel. The only difference between the two is that the PDN bearers are of different types and the NB-IoT network does not allocate IP addresses to UEs using non-IP bearers.
The transmission process of non-IP data packets between the second segment P-GW and D-MEC, and between the third segment D-MEC and AS, is shown in fig. 10. In order to ensure that the non-IP data packet can be transmitted between the second segment P-GW and the D-MEC through the IP network, the IP address of the D-MEC may be configured in advance on the P-GW with the APN as a granularity, where the granularity may be a number segment. When determining that UE initiates attachment and establishes connection with a PDN of a core network, P-GW allocates an IP address for the UE; and according to the GTP tunnel corresponding to the UE, establishing a mapping relation between the ID of the GTP tunnel corresponding to the UE and the IP address allocated to the UE.
In the uplink transmission process of the non-IP data packet from the P-GW to the D-MEC and then from the D-MEC to the AS through the IP network, the P-GW strips the non-IP data packet from the GTP tunnel after receiving the non-IP data packet at the UE side, and takes the uplink non-IP data packet stripped from the GTP tunnel AS the message content; an IP address distributed for UE sending an uplink non-IP data packet is used as a source address, and the IP address of the D-MEC is used as a destination address to generate uplink IP message header information; combining the stripped uplink non-IP data packet with the header information of the uplink IP message to generate an uplink IP message of the uplink non-IP data packet; and then sending the generated uplink IP message of the uplink non-IP data packet to the D-MEC through an IP network.
After the D-MEC receives the uplink message sent by the P-GW, on one hand, the contents of the non-IP data packet in the uplink message and the user ID in the uplink message are analyzed, and the mapping relation between the user ID and the IP address distributed for the UE is established so as to facilitate the sending of the downlink data packet. On the other hand, taking the uplink non-IP data packet stripped from the GTP tunnel as the message content; the IP address of the D-MEC is used AS a source address, and the IP address of the AS is used AS a destination address to generate the uplink IP message header information again; combining the stripped uplink non-IP data packet with the regenerated uplink IP message header information to regenerate an uplink IP message of the uplink non-IP data packet; and then sending the uplink IP message of the regenerated uplink non-IP data packet to the AS through the IP network.
And after the AS receives the uplink IP message of the regenerated uplink non-IP data packet sent by the D-MEC, converting the source address in the received uplink message sent by the D-MEC into the IP address of the AS, and converting the destination address into the IP address of the D-MEC so AS to be convenient for sending the downlink data packet.
In the downlink transmission process of a non-IP data packet from an AS to a D-MEC through an IP network and then from the D-MEC to a P-GW, after the D-MEC receives a response data packet of an uplink non-IP data packet sent by the AS, the response data packet of the uplink non-IP data packet is used AS message content; generating downlink message header information by taking the IP address of the D-MEC as a source address and taking the IP address distributed to the UE sending the uplink non-IP data packet as a destination address; combining the response data packet of the uplink non-IP data packet with the header information of the downlink IP message to generate a downlink IP message of the downlink non-IP data packet; and then sending the generated downlink IP message of the downlink non-IP data packet and the mapping relation between the user ID established in the uplink transmission process of the non-IP data packet and the IP address allocated to the UE to the P-GW through an IP network.
After receiving the downlink message sent by the D-MEC and the mapping relation between the user ID established in the uplink transmission process of the non-IP data packet and the IP address allocated to the UE, the P-GW analyzes the response data packet of the uplink non-IP data packet in the downlink message and the user ID in the mapping relation between the user ID established in the uplink transmission process of the non-IP data packet and the IP address allocated to the UE. And sending the analyzed response data packet to the corresponding terminal according to the user ID.
It can be seen that in the data packet transmission method, apparatus, system and packet data gateway provided in the embodiments of the present invention, the non-IP data packet is translated into the IP data packet on the P-GW, so that the IP network in the prior art can be used for data packet transmission after the P-GW, thereby greatly improving the reusability of the data packet and the IP path, improving the overall efficiency of the network, and reducing the complexity of network construction.
The transmission process of the IP-based data packet between the second segment P-GW and D-MEC, and the transmission process between the third segment D-MEC and AS, AS shown in fig. 11. Since the NB-IoT network assigns an IP address to the UE using the IP bearer during the transmission of the IP-based packet between the first UE and the P-GW, the IP-based packet can be transmitted through the IP network in the transmission path after the P-GW without being translated in the P-GW.
After receiving the IP data packet of the UE side, the P-GW can directly send the IP data packet to the D-MEC through an IP network. After the D-MEC receives the uplink message sent by the P-GW, on one hand, the content of the IP data packet in the uplink message and the user ID in the uplink message are analyzed, and the mapping relation between the user ID and the IP address of the UE is established so as to facilitate the sending of the downlink data packet. On the other hand, the source address of the upstream IP data packet is converted into the IP address of the D-MEC, and the destination address is converted into the IP address of the AS. And then sends it to the AS over the IP network. And after the AS receives the uplink IP data packet sent by the D-MEC, converting a source address in the received uplink IP data packet into an IP address of the AS, and converting a destination address into the IP address of the D-MEC so AS to send the downlink data packet.
In the downlink transmission process of the IP data packet from the AS to the D-MEC and then from the D-MEC to the P-GW through the IP network, after the D-MEC receives the downlink IP data packet sent by the AS, the source address of the downlink IP data packet is converted into the IP address of the D-MEC, and the destination address is converted into the IP address of the UE. And the downlink IP data packet of which the source address and the destination address are converted and the mapping relation between the user ID and the IP address of the UE established in the uplink transmission process of the IP data packet are sent to the P-GW through an IP network. And after the P-GW receives the downlink IP data packet sent by the D-MEC and the mapping relation between the user ID established in the uplink transmission process of the IP data packet and the IP address of the UE, analyzing the user ID in the mapping relation between the user ID established in the uplink transmission process of the IP data packet and the IP address of the UE. And sending the downlink IP data packet to the corresponding UE according to the user ID.
The data transmission method, the device, the system and the packet data network gateway provided by the embodiment of the invention comprise the following steps: receiving uplink non-IP data sent by the terminal UE through the 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 mapping relation between the ID of each GTP tunnel and the IP address allocated to each UE, which is established in advance; generating an uplink IP message of the uplink non-IP data according to the determined IP address distributed to the UE for sending the uplink non-IP data and the stripped uplink non-IP data; and 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 uplink IP message of the uplink non-IP data is generated according to the determined IP address allocated to the UE for sending the uplink non-IP data and the stripped uplink non-IP data, so that the non-IP data can be transmitted in an IP network, and therefore, the transmission of the non-IP data in NB-IoT is realized, and meanwhile, the compatibility with IP transmission is considered.
In addition, the data transmission method, the device, the system and the packet data network gateway provided by the embodiment of the invention can realize the transmission of non-IP data in NB-IoT and have good compatibility with IP transmission in the prior art, so the data transmission method, the device, the system and the packet data network gateway provided by the embodiment of the 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 changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such 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 such 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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