WO2007104216A1

WO2007104216A1 - An user data routing method and gateway in evolved network

Info

Publication number: WO2007104216A1
Application number: PCT/CN2007/000334
Authority: WO
Inventors: Weihua Hu
Original assignee: Huawei Technologies Co., Ltd.
Priority date: 2006-03-10
Filing date: 2007-01-30
Publication date: 2007-09-20
Also published as: CN1848811A; CN100450097C

Abstract

An user data routing method in evolved network includes: a mapping relation between the global address of the user and the local address of the user is stored at the network side; when the data message, the destination address of which is the global address of the user, is demanded to forward to the user at the network side, the global address of the user is obtained from the data message, the global address is mapped to the local address of the user according to the mapping relation, and the data message is forwarded according to the obtained local address. A gateway is used to realize user data routing in evolved network. By the method and device, the service quality of the mobile user is increased, the network resource is utilized adequately, and the problem of the user data plane routing optimization in future evolved network is solved.

Description

User data routing method and gateway in evolved network

Technical field

The present invention relates to the field of mobile communication technologies, and in particular to a user data routing method and gateway in an evolved network. Background of the invention

In order to enhance the competitiveness of the Third Generation Partnership Project (3GPP) system, research on the evolution of access technologies is being conducted within the 3GPP organization. In particular, in order to enhance the ability of 3GPP systems to handle rapidly growing IP data services, the use of packet technology is further enhanced within 3GPP systems. The most important parts of this type of technology evolution include: reducing latency and latency, increasing user data rates, enhancing system capacity and coverage, and reducing overall carrier costs. Moreover, the evolution of the network structure is also an important indicator for the backward compatibility of existing networks.

To improve the user's service quality, the evolved network is required to optimize the user's user plane routing. Since in the future evolution network, all services of mobile users, including packet, voice and multimedia, are carried over IP, there is a strong practical need for route optimization, such as roaming users between roaming and other mobile users in the roaming area. The call will be a major service of the roaming user. If the optimization is not performed, the service data needs to be forwarded through the home network, which not only wastes network resources, but also reduces the service quality of the roaming user. Therefore, the route optimization for the roaming user data is Very necessary. In addition, the prior art has a very strong demand for routing data of users in non-roaming situations and saving network resources. However, there is currently no clear strategy and method to implement route optimization for users in an evolved network.

If it is the IP address assigned by the home network, even if both the roaming user and the communication destination are in the same roaming network, the data between the roaming user and the communication destination must be routed back to the home network and then transmitted through the roaming network. Summary of the invention

The invention provides a user data routing method and device in an evolved network, which improves the service quality of mobile users.

The present invention provides a method for routing user data in an evolved network, including the following steps: establishing a mapping relationship between a global address of a user and a local address;

Obtaining the global address of the user from the data packet to be forwarded, and searching for the local address of the user according to the mapping relationship;

Forwarding the data packet according to the corresponding local address.

The present invention further provides a gateway for realizing user data routing in an evolved network, a storage device for storing a mapping relationship between a global address and a local address of the user, and a global address for obtaining the user from the data packet to be forwarded. And the device that maps the global address to the local address of the user according to the mapping relationship, and forwards the data packet according to the obtained local address.

The invention saves the mapping relationship between the global address and the local address of the user through the network device. If the destination address of the data packet is mapped to a local address, the destination of the data packet is localized by the gateway. In the network, the data packet is directly forwarded according to the local address obtained by the query, thereby saving network resources, improving the service quality of the user, and solving the problem of optimizing the data plane route of the user in the future evolved network. BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a structural diagram of a wireless evolved network (non-roaming scenario);

2a is a schematic diagram of data routing through a GERAN communication between a roaming user and another roaming user; FIG. 2b is a schematic diagram of a simplified communication data routing between users of the A network roaming to the B network through the GERAN;

2c is a schematic diagram of simplified communication data routing of a roaming user and a roaming user through GERAN; 3 is a schematic diagram of data routing for roaming users and other users roaming through Evolved RA;

4 is a schematic diagram of data routing for roaming users and other users roaming through GERAN and Evolved RAN;

FIG. 5 is a flowchart of a method provided in an embodiment of the present invention; FIG.

6 is a schematic diagram of data routing of a roaming user and other users roaming through GERAN according to an embodiment of the present invention;

FIG. 7 is a schematic diagram of data routing of a roaming user and another user roaming through the Evolved RAN according to an embodiment of the present invention;

FIG. 8 is a schematic diagram of data routing between a roaming user and another roaming user through GERAN and Evolved RAN according to an embodiment of the present invention.

FIG. 9 is a schematic diagram of user data route optimization according to an embodiment of the present invention in a non-roaming scenario. Mode for carrying out the invention

The embodiment of the present invention saves the mapping relationship between the local addressable address of the mobile user or the IP address used by the data channel and the data packet of the user service layer by the core network device. Before forwarding the data packet sent by the user, query the saved mapping relationship according to the destination address of the data packet. If the destination address of the data packet is mapped to a local address, the destination of the data packet is located. In the local network managed by the gateway, the data packet is directly forwarded according to the query.

Specific embodiments of the present invention will be described below with reference to the accompanying drawings.

As shown in FIG. 1 , the core network of the wireless evolved network mainly includes three logical functions: a mobility management entity (MME), a user plane entity (UPE), and an user plane anchor (InterASAnchor) between different access systems, where: MME Responsible for the mobility management of the control plane, including user context and mobility state management, assigning user temporary identity, security functions, etc., which corresponds to the control plane portion of the current Universal Wireless Telecommunications System (UMTS) Internal Serving GPRS Support Node (SGSN); The UPE is responsible for initiating paging for downlink data in idle state, managing and storing IP bearer parameters and routing information within the network, etc., which corresponds to the current ' The data plane portion of the SGSN and GPRS Gateway Node (GGSN) within the UMTS system; InterASSystemAnchor acts as the user plane anchor between different access systems. The GPRS refers to a general packet radio service. In FIG. 1, an evolved radio access network (Evolved RAN), an evolved packet core network (Evolved Packet Core), and interfaces S1 to S7 are new functional elements and interfaces.

As shown in Figure 2a, data is routed through the GSM EDGE Radio Access Network (GERAN) for roaming users and other users in the roaming area. The home network of the roaming user MSa is A, the MSa roams to the remote network B, the MSb represents other users accessing the network B, or it is a local user of the B network, or a roaming user of other networks, or even an A network. User. According to the different attribution of MSb, it is divided into the following three cases:

1) If the MSb is also a user roaming to the B network by the A network, taking the user data from the MSa to the MSb as an example, the route is as follows: The user data first arrives at the GPRS CORE of the roaming network B through the GERAN through the MSRAN, and then arrives at the Inter AS of the home network. Anchor, then arrives at the GPRS CORE of the roaming network, and finally reaches the MSb through GERAN; if the user data flows from the MSb to the MSa, the route is opposite to the above route, and the above two routes are as shown by the short dashed line in Figure 2a, or see The route shown by the dashed line in Figure 2b.

2) If MSb is a B network user, taking user data from MSa to MSb as an example, the route is as follows: User data from MSa first reaches the GPRS CORE of roaming network B through GERAN, then arrives at Inter AS Anchor of home network A, and then passes through the Internet. Returning to the GPRS CORE of the roaming network B, and finally reaching the MSb through the GERAN; similarly, if the user data flows from the MSb to the MSa, the route is opposite to the above route, and the above two routes are as shown by the long dashed line in FIG. 2a, or See the route shown by the dashed line in Figure 2c.

3) If the MSb is a roaming user of other non-A networks, taking the user data from the MSa to the MSb as an example, the route is as follows: The user data first arrives at the GPRS CORE of the roaming network B through the GERAN through the MSRAN, and then arrives at the Inter AS Anchor of the home network A. Then, the Internet reaches the Inter AS Anchor of the MSb home network, returns to the GPRS CORE of the roaming network B, and finally reaches the MSb through the GERAN. Similarly, if the user data flows from the MSb to the MSa, the route is related to the above route. In contrast, and as can be seen from the above description, the above two routes are similar to 2), except that the user data may pass through the GPRS core network (CORE) and may pass through the InterABnchor of the MSb home network and then connect to the Internet.

As shown in FIG. 3, data routing for roaming users and other users roaming through an evolved radio access network (Evolved RAN). The home network of the roaming user MSa is A, the MSa roams to the remote network B, the MSb represents other users accessing the network B, or it is a local user of the B network, or a roaming user of other networks, or even an A network. User. According to the different attribution of MSb, it is divided into the following three cases:

Γ) If the MSb is also a user roaming to the B network by the A network, taking the user data from the MSa to the MSb as an example, the route is as follows: The user data first arrives at the MME UPE of the roaming network B through the Evolved RAN from the MSa, and then arrives at the home network A. Inter AS Anchor, then arrives at the MME UPE of the roaming network, and finally reaches the MSb through the Evolved RA; if the user data flows from the MSb to the MSa, the route is opposite to the above route, and as described above, the above two routes are as shown in FIG. The short dashed line is shown.

2') If the MSb is a B network user, taking the user data from the MSa to the MSb as an example, the route is as follows: The user data first arrives at the MME UPE of the roaming network B through the Evolved RAN from the MSa, and then arrives at the Inter AS Anchor of the home network A, and then After the Internet and the Internet AS Anchor in the roaming network B return to the MME UPE of the roaming network B, and finally reach the MSb through the Evolved RAN; similarly, if the user data flows from the MSb to the MSa, the route is opposite to the above route, and is described above. It can be seen that the above two routes are all shown by the long dashed line in FIG.

3') If the MSb is a roaming user of other non-A networks, taking the user data from the MSa to the MSb as an example, the route is as follows: The user data first arrives at the MME UPE of the roaming network B through the Evolved RAN from the MSa, and then arrives at the Inter of the home network A. AS Anchor, then goes to the Inter AS Anchor of the MSb home network through the Internet, then to the MME UPE of the roaming network B, and finally reaches the MSb through the Evolved RAN. Similarly, if the user data flows from the MSb to the MSa, the route is opposite to the above route, and As can be seen from the above description, both routes are similar to 2'), only It is through the MME and UPE that may pass through the InterABnchor of the MSb home network and then connect to the Internet.

Figure 4 shows the data routing between roaming users and other users roaming through GERAN and Evolved RAN. The home network of the roaming user MSa is A, the MSa roams to the remote network B, the MSb represents other users accessing the network B, or it is a local user of the B network, or a roaming user of other networks, or even an A network. User. According to the different attribution of MSb, it can be divided into the following three situations:

Γ) If the MSb is also a user roaming to the B network by the A network, taking the user data from the MSa to the MSb as an example, the route is as follows: The user data first arrives at the GPRS CORE of the roaming network B through the UT AN through the UT AN, and then arrives at the home network A. InterAS Anchor, then arrives at the MME UPE of the roaming network B, and finally reaches the MSb through the Evolved RAN; if the user data flows from the MSb to the MSa, the route is opposite to the above route, and the two routes are as shown by the short dashed line in FIG. .

2") If MSb is a B network user, taking user data from MSa to MSb as an example, the route is as follows: User data from MSa first reaches the GPRS CORE of roaming network B through UTRAN, then arrives at Inter AS Anchor of the home network, and then passes The Internet and the Internet AS Anchor in the roaming network B return to the MME UPE of the roaming network B, and finally reach the MSb through the Evolved RAN. Similarly, if the user data flows from the MSb to the MSa, the route is opposite to the above route, and the above two routes Both are shown as long dashed lines in Figure 4.

3") If MSb is a roaming user of other non-A networks, taking user data from MSa to MSb as an example, the route is as follows: User data from MSa first reaches the GPRS CORE of roaming network B through UTRAN, and then arrives at Inter AS of home network A Anchor, then through the Internet to the Inter AS Anchor of the MSb home network, then to the MME UPE of the roaming network B, and finally to the MSb through the Evolved RAN; similarly, if the user data flows from the MSb to the MSa, the route is opposite to the above route, and As can be seen from the above description, both of the above routes are similar to 2"), but may pass through the InterASAnchor of the MSb home network through the MME and the UPE and then connect to the Internet.

FIG. 5 is a schematic diagram of roaming user data routing in a third generation cooperative project evolution network according to an embodiment of the present invention; Methods, including:

Step 501: The roaming user establishes or updates an IP connection bearer.

Step 502: The gateway device of the roaming network acquires a home IP address allocated by the roaming user home network to the roaming user.

Step 503: The gateway device of the roaming network saves the mapping relationship between the home IP address and the roaming address or data channel of the roaming user mobile terminal in the roaming network.

And when the roaming user moves under the current gateway device overlay network, if the roaming address changes, the gateway device of the roaming network updates the mapping relationship; when the roaming user leaves the current gateway device, accesses the other When the gateway device is used, the gateway device of the roaming network deletes the mapping relationship.

Step 504: Query the mapping relationship before forwarding the data packet sent by the roaming network access network user.

Step 505: Determine whether the destination address of the data packet to be forwarded matches the corresponding roaming address, and if the destination address of the data packet to be forwarded can match the corresponding roaming address, go to step 506; otherwise, Go to step 507:

Step 506: Forward the data packet according to the matched roaming address.

Step 507: Forward the data according to the destination address of the data packet.

In the following embodiments of the present invention, it should be noted that:

In the figure, the home network of the mobile user MSa is A, roaming to the remote network B, and the mobile user MSb represents other users accessing the network B, it is either a local user of the B network, or a roaming user of other networks, or even A. Users of the network. For convenience of description, the mobile user mentioned in the embodiment is only an abstract concept, which may be a mobile terminal or other communication node. In addition, the local address or data channel mentioned in the embodiment may be an address, such as an IP address, a local link, a local port, a tunnel, or the like, which can communicate with the user.

As shown in FIG. 6, the gateway device in the GPRS CORE of the roaming network B can obtain the home network as a mobile terminal during the process of establishing a DP connection bearer by using the method provided by the embodiment of the present invention. The IP address assigned by the user IPA, and the mapping relationship between the IPA and the roaming user in the B network addressable address AddB is saved. Since the mobile user MSa accesses through the GSM EDGE Radio Access Network (GERAN) in the roaming network B, the IP address assigned to the home network must be delivered by the gateway device in the GPRS CORE, so the IP is in the GPRS CORE. The gateway device is visible and available.

Here, AddrB can be a local IP address. For example, when using mobile IP technology, the roaming network gateway device acts as a foreign company to assign a care-of address to the user; AddrB can also be a data channel identifier, such as a GTP tunnel; AddrB can also be other local Link address, etc. In summary, AddrB must be the local address or data channel that the roaming network gateway device can address to user a.

In this way, when the gateway device in the GPRS CORE forwards the user data packet, the above-mentioned saved mapping relationship is queried. If the mapping relationship exists, and the destination address is the IP address of the mobile user IPA, the mapping can be based on the local mapping. The address AddrB forwards the user data packet, so that all users MSb send data packets sent to the user MSa through the gateway device in the GPRS CORE, and do not need to be sent to the home network A of the user MSa first, but directly in the local network. Routed to the user MSa. Symmetrically, when the other user MSb is also a roaming user, the above method is also applicable. Therefore, regardless of whether the user MSb roams the user, the data sent by the MSa to the MSb is directly routed through the gateway device in the GPRS CORE of the roaming place, directly Forwarded to the MSb, resulting in an optimized effect as shown in Figure 6.

The case where the MSa and the MSb are route optimized through UTRAN access is similar and will not be mentioned here.

As shown in FIG. 7, according to the method provided by the embodiment of the present invention, the gateway device MME/UPE in the roaming network B can obtain the mobile terminal allocated by the home network as a roaming user in the process of establishing an IP connection bearer by the roaming user. The IP address IPA, and the mapping relationship between the IPA and the roamable user's addressable address AddB in the B network. The IP address of the mobile subscriber's home network must be delivered through the ME/UPE of the evolved network, because the IP address of the mobile subscriber's home network is to be delivered through the evolved radio access network (Evolved RAN). The gateway device MME/UPE of the evolved network is visible and available. Here, AddrB can be a local IP address. For example, when using mobile IP technology, the roaming network gateway device acts as a foreign company to assign a care-of address to the user; AddrB can also be a tunnel identifier, such as a GTP tunnel; AddrB can also be a link-local address. In summary, AddrB is the gateway device MME/UPE of the roaming network that can address the address of the user MSa.

When the gateway device in the evolved network forwards the user data packet, the above-mentioned saved mapping relationship is queried. If the mapping relationship exists, and the destination address is the IP address of the mobile user, the IP address can be mapped according to the mapping. The local address AddrB forwards the user data packet, so that all the data packets sent by the user MSb to the user MSa through the gateway device of the evolved network do not need to be sent to the network A to which the user MSa belongs, but directly on the local network. Routed to the user MSa. Symmetrically, when the other user MSb is also a roaming user, the above method is also applicable. Therefore, regardless of whether the user MSb roams the user, the data sent by the MSa to the MSb is directly routed through the gateway device MME/UPE of the roaming place, and directly sent. The MSb is given, thereby obtaining an optimized effect as shown in FIG.

The routing optimization is similar when a roaming user accesses a roaming network through non 3GPP IP Access or LAN 3GPP IP Access, and is not described here.

In contrast to the above embodiments, it is apparent that the gateway device of the roaming location is different depending on the access system in which the user is located.

As shown in FIG. 8, the method provided by the embodiment of the present invention, when the mobile user MSa accesses the roaming network B, needs to pass through a local anchor in the B network, regardless of the access system access. Connected to the Inter AS Anchor of the home network, so the local anchor can obtain the IP address IPA assigned by the home network to the mobile user during the establishment of the IP connection bearer of the roaming user, and save the IPA and the user in the B network addressable address AddB Mapping relationship. Because the mobile user MSa accesses the access network in the roaming network B, the IP address assigned to the home network of the MSa must be delivered through the local anchor Local Anchor in the B network, so the IP pair local anchor Point Local Anchor is visible and available.

Here, AddrB can be a local IP address. For example, when using mobile IP technology, the roaming network gateway device acts as a foreign company to assign a care-of address to the user; AddrB can also be a tunnel identifier. For example, GTP tunnel; AddrB can also be a link-local address, etc. In short, AddrB is the gateway device of the roaming network. The local anchor Local Anchor can address the address of the user MSa.

In this way, when the local anchor of the gateway device in the evolved network forwards the user data, the above-mentioned saved mapping relationship is queried. If the mapping relationship exists, the destination address is the IP address IPA of the mobile user. The user data packet can be forwarded according to the mapped local address AddrB, so that all user MSbs need to send the data packet to the user MSa through the local anchor point of the gateway device of the evolved network. Network A, while routing directly to the user MSa on the local network. Symmetrically, when the other user MSb is also a roaming user, the above method is also applicable. Therefore, regardless of whether the user MSb roams the user, the data sent by the MSa to the MSb is directly optimized by the local anchor of the gateway device of the roaming local anchor. Directly sent to the MSb, thereby obtaining the optimized effect as shown in FIG.

The case where mobile users use route optimization through non 3GPP IP Access or WLAN 3GPP IP Access access is similar, and is not described here.

In addition, the premise of user data routing optimization in the roaming scenario must be that the user home network and the roaming network are allowed to perform route optimization after negotiation. Considering that the above negotiation itself requires the mobile user to register in the roaming place or establish an IP connection bearer, and the gateway device of the roaming place needs to participate, the gateway device of the roaming place completely understands the negotiation result of all the roaming users, and according to the result, Decide whether to enable the route optimization method of the present invention for the user. In a roaming scenario, the method does not require IP to be allocated by the roaming network, that is, if the home network allocates an IP address to the home network, if the home network and the roaming network negotiate to allow roaming user data routing optimization, the roaming gateway saves and Query the mapping relationship between the user IP address and the addressable address or the reachable data channel of the user in the roaming network, optimize the data plane route between the roaming user and other communication nodes in the roaming area, improve the performance of the corresponding data service, and provide roaming Users bring a better business experience.

Another embodiment of the present invention is described below with reference to FIG. 9. In the non-roaming scenario, the mobile subscriber MSa sends data to the mobile subscriber MSb as an example. The MSa accesses the network through the Evloved RAN, and the data sent by the MSa first arrives at the MME/UPE. , using route optimization technology, save mobile users in UPE The mapping relationship between the local address and the global address of the MSb in the network, for example, the local addressable address of the MSb or the mapping relationship between the data channel and the IP address used by the data layer of the MSb, if the UPE forwards the data to the Local Before the anchor is the local anchor point, the UPE finds the local addressable address or data channel of the MSb in the saved mapping relationship, and the UPE directly sends the data to the locally addressable address or data channel of the MSb that is found. The data transmission process is shown by the short dashed line in the figure. If the UPE does not find the local addressable address or data channel of the MSb in the saved mapping relationship, the data is sent to the Local Anchor according to the prior art, and then the Local Anchor. The data is sent to the user MSb through the MME/UPE and the Envolved RAN, and the data transmission process is shown by the long dashed line in the figure. If data is sent from the mobile subscriber MSb to the mobile subscriber MSa, the data flow is just the opposite. It should be noted that the MME is responsible for the processing of the control plane signaling, so that the local address and the global address of the mobile user can be obtained, that is, the local address and the global address of the mobile user are visible to the MME, and the MME can locally obtain the obtained device. The address and the global address are used to notify the UPE by using the interaction with the UPE during the bearer setup or update process, so that the UPE saves the mapping between the global address and the local address of the device. The method provided by the embodiment of the present invention can improve the service quality of the user and make full use of network resources.

It should be noted that, for simplicity of description, the MME and the UPE are drawn together in the schematic diagram of the embodiment of the present invention, but it is not excluded that they can be separated. In addition, the network location of the local anchor Local Anchor does not affect the applicability of the embodiment of the present invention, for example, the possibility that the local anchor point and the UPE coexist in the same network node are not excluded. The mobile user to which the above embodiment is applicable may be a mobile terminal or any other communication node.

The optimization method of the user data plane route proposed in the embodiment of the present invention can solve the data plane route optimization problem of the future evolution network to the middle user.

The above specific embodiments are merely illustrative of the invention and are not intended to limit the invention.

Claims

Claim

A method for routing user data in an evolved network, comprising:

Establish a mapping relationship between the global address of the user and the local address.

The data packet is forwarded according to the corresponding local address.

2. The method according to claim 1, further comprising: if the user address changes, updating the mapping relationship.

The method according to claim 1 or 2, wherein in the roaming scenario, the global address is a home address of the user, and the local address is a roaming address of the user.

4. The method according to claim 3, wherein the home address is a home internet protocol IP address.

The method according to claim 3, wherein, in the roaming scenario, the mapping relationship between the global address of the establishing user and the local address includes:

When the user establishes or updates the IP connection bearer, the gateway device of the roaming network acquires the home IP address assigned by the user home network to the user, and establishes a mapping relationship between the user's home IP address and the roaming address.

The method according to claim 5, wherein when the user leaves the current gateway device, the corresponding mapping relationship on the current gateway device is deleted.

The method according to claim 5, wherein the gateway device comprises: a gateway device of a GPRS core network, a mobility management entity of an evolved wireless core network, and/or a user plane entity of an evolved wireless network, and evolved wireless The local anchor of the network.

8. The method according to claim 3, wherein the user accesses the roaming network through a roaming network radio access network.

The method according to claim 8, wherein the roaming network radio access network packet Includes: Evolved Radio Access Network, UMTS Terrestrial Radio Access Network, GSM EDGE Radio Access Network, non 3GPP IP Access Network, WLAN 3GPP IP Access Network or Internet.

The method according to claim 3, wherein the user comprises: a mobile terminal, a communication node.

The method according to claim 3, wherein the roaming address is: an IP address, a local link, a local port, a track, or a local address capable of communicating with a user when roaming.

12. The method according to claim 1 or 2, wherein, in the non-roaming scenario, the mapping relationship between the global address of the established user and the local address includes:

The UPE is used to notify the UPE of the user's local address and the global address. The UPE establishes the mapping between the global address and the local address of the user.

The method according to claim 12, wherein the global address is an IP address used by a user's service layer data packet, and the local address is a data channel identifier.

The method according to claim 12, wherein the global address is an IP address used by a user service layer data message, and the local address is a local addressable address of the user.

15. A gateway, comprising:

a storage device for storing a mapping relationship between a global address and a local address of the user; and obtaining a global address of the user from the data packet to be forwarded, and mapping the global address to the user according to the mapping relationship a local address, and means for forwarding the data message according to the obtained local address.

The gateway according to claim 15, wherein in the roaming scenario, the global address is a home address of the user, and the local address is a roaming address of the user.

The gateway according to claim 16, wherein the gateway is a gateway device of a GPRS core network, a mobility management entity of an evolved wireless core network, and/or a user plane entity of an evolved wireless network or a localized network of an evolved wireless network. Anchor point.

The gateway according to claim 15, wherein in the non-roaming scenario, the whole The office address is the IP address used by the user's service layer data packet, and the local address is the data channel identifier.

The gateway according to claim 15, wherein in the non-roaming scenario, the global address is an IP address used by a user's service layer data packet, and the local address is a user's local addressable address. .

The gateway according to claim 18 or 19, wherein the gateway is a user plane entity of an evolved wireless network.