CN108471633B - Communication method and communication system - Google Patents

Communication method and communication system Download PDF

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Publication number
CN108471633B
CN108471633B CN201810188516.1A CN201810188516A CN108471633B CN 108471633 B CN108471633 B CN 108471633B CN 201810188516 A CN201810188516 A CN 201810188516A CN 108471633 B CN108471633 B CN 108471633B
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address
forwarded
lwa
pgw
gateway
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CN108471633A (en
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周明宇
云翔
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Baicells Technologies Co Ltd
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Beijing Bai Caibang Technology Co ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/14—Reselecting a network or an air interface
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L61/00—Network arrangements, protocols or services for addressing or naming
    • H04L61/09—Mapping addresses
    • H04L61/25—Mapping addresses of the same type
    • H04L61/2503—Translation of Internet protocol [IP] addresses
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/30—Connection release
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/02—Terminal devices
    • H04W88/06—Terminal devices adapted for operation in multiple networks or having at least two operational modes, e.g. multi-mode terminals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/16—Gateway arrangements

Abstract

The embodiment of the invention provides a communication method and a communication system. In the embodiment of the invention, in response to the WLAN communication link being released, the LWA gateway and/or the terminal device sends the address mapping relationship stored by itself to the PGW, where the address mapping relationship is used to indicate a corresponding relationship between addresses of devices in the communication system, and then the PGW receives the address mapping relationship, so that, in response to receiving the downlink message to be forwarded, the PGW determines, according to the address mapping relationship, a target bearer corresponding to the downlink message to be forwarded, and forwards the downlink message to be forwarded to the first target address through the target bearer; or, in response to receiving the uplink message to be forwarded, the terminal device determines a target bearer corresponding to the uplink message to be forwarded according to the address mapping relationship, and forwards the uplink message to be forwarded to the second target address through the target bearer. The technical scheme provided by the embodiment of the invention can simplify the processing procedure, avoid the waste of communication resources and improve the network performance.

Description

Communication method and communication system
[ technical field ] A method for producing a semiconductor device
The present invention relates to the field of communications technologies, and in particular, to a communication method and a communication system.
[ background of the invention ]
The LTE WLAN Aggregation (LWA) technology is a technology that supports a User Equipment (UE) to simultaneously receive and transmit an Internet Protocol (IP) stream through Long Term Evolution (LTE) and a Wireless Local Area Network (WLAN). Currently, the 3GPP supports multiple LTE and WLAN aggregation data technologies, which are classified into LTE and Wireless Fidelity (WiFi) aggregation technologies at an LTE core Network and LTE and WLAN aggregation technologies at a Radio Access Network (RAN). In the technology of aggregating LTE and WiFi at an LTE core Network, two Network architectures of trusted access and untrusted access are provided, and a Packet Data Network (PDN) GateWay (PDN GateWay, PGW) of a core Network connected to a WLAN in a trusted or untrusted manner is supported. In an untrusted mode, UE establishes PDN connection with a core network through a WLAN and establishes a secure connection (IPSec tunnel) with the core network to ensure data security; in a trusted mode, when the UE establishes PDN connection with a core network through a WLAN, the UE does not need to establish safe connection and only needs to establish an IP tunnel. After the UE establishes PDN connection through the WLAN, the PGW may receive and send an IP data stream of the UE through the WiFi, and the PGW may receive or send UE data through LTE and WiFi at the same time, or receive and send UE data only through LTE or WiFi, and similarly, the UE may also receive and send LTE core network data through the WLAN.
Among them, IP tunneling is the process by which a router encapsulates one network layer protocol into another protocol for transmission across a network to another router. Tunneling is a packet encapsulation technique that encapsulates an original IP packet (whose header contains the original sender and the final destination) into the data payload of another packet (called an encapsulated IP packet) for transmission.
In the cellular network, the IP packets of the user need to be mapped to different Evolved Packet Systems (EPS) bearers (EPS Bearer) to obtain corresponding Quality of Service (QoS) guarantees. Such mapping is achieved by a filtering Template (TFT) and a Packet filter (Packet Filters) therein. One TFT may contain a plurality of packet filters. Packet filter typically contains an IP quintuple: a source IP address, a destination IP address, a source port number, a destination port number, and a protocol number. Wherein one bearer binds one TFT. The TFT is divided into an uplink direction and a downlink direction, wherein the uplink TFT filters and maps uplink data packets on the UE side. The downstream TFT filters and maps downstream packets on the PDN side.
Based on the above, in the LWA communication system, after the IP tunnel of the Wi-Fi link therein is released, the transmission can be continued by using the IP tunnel of the LTE link.
In this case, since only one mobile communication link exists, when the IP tunnel is continuously used for data encapsulation between the LWA and the UE, another set of IP addresses is needed to be used for encapsulating the original IP packet, which involves complicated processing procedures such as IP tunnel removal and IP tunnel establishment, and at the same time, the processing procedures are increased, and compared with the case of directly using the LTE link for data transmission, the waste of communication resources is also caused.
Therefore, after the WLAN communication link in the LWA communication system is released, how to directly utilize the LTE link for data transmission to avoid wasting communication resources is an unsolved problem in the art.
[ summary of the invention ]
In view of this, embodiments of the present invention provide a communication method and a communication system, and provide a method for switching data transmission in an IP tunnel mode to transmission directly using a mobile communication link after a WLAN communication link in an LWA communication system is released, so as to simplify a network element processing procedure to a certain extent, avoid waste of communication resources, and improve network performance.
In one aspect, an embodiment of the present invention provides a communication method, which is applied to a communication system including an LWA gateway aggregated with a Wireless Local Area Network (WLAN) and a PDN gateway, a PGW and a terminal device, where a WLAN communication link is established between the LWA gateway and the terminal device, and the LWA gateway establishes a mobile communication link with the terminal device through the PGW; the method comprises the following steps:
in response to the WLAN communication link being released, the LWA gateway and/or the terminal device sends an address mapping relationship stored by itself to the PGW, where the address mapping relationship is used to indicate a correspondence relationship between device addresses in the communication system;
the PGW receives the address mapping relation;
in response to receiving a downlink message to be forwarded, the PGW determines a target bearer corresponding to the downlink message to be forwarded according to the address mapping relationship, and forwards the downlink message to be forwarded to a first target address through the target bearer;
and in response to receiving the uplink message to be forwarded, the terminal equipment determines a target bearer corresponding to the uplink message to be forwarded according to the address mapping relation, and forwards the uplink message to be forwarded to a second target address through the target bearer.
The above-described aspect and any possible implementation manner further provide an implementation manner, where the address mapping relationship is a correspondence relationship between an address of a user equipment, an address of a terminal equipment, an address of an LWA gateway, and an address of a network application.
The foregoing aspects and any possible implementations further provide an implementation, where the address mapping relationship is a correspondence relationship between an address of the user equipment, an address of the terminal equipment, and an address of the network application.
The above-described aspects and any possible implementations further provide an implementation, and the method further includes:
the PGW stores the address mapping relationship.
The above-described aspect and any possible implementation manner further provide an implementation manner, where the downlink message to be forwarded is sent to the PGW by a network application through the LWA gateway, and the first destination address is an address of a user equipment.
The foregoing aspect and any possible implementation manner further provide an implementation manner, where the downlink message to be forwarded is sent to the PGW by a network application, and the first destination address is an address of a user equipment.
As for the above-mentioned aspect and any possible implementation manner, an implementation manner is further provided, before the PGW determines, according to the address mapping relationship, a target bearer corresponding to the downlink message to be forwarded, where the method further includes:
and the PGW updates a filter template TFT so that the address of the network application replaces the address of the LWA gateway.
As for the above-mentioned aspect and any possible implementation manner, an implementation manner is further provided, before the PGW determines, according to the address mapping relationship, a target bearer corresponding to the downlink message to be forwarded, where the method further includes:
and the network application updates the address of the next hop from the address of the LWA gateway to the address of the PGW.
The above-described aspect and any possible implementation manner further provide an implementation manner, where the address mapping relationship includes an address of the terminal device.
As for the above aspect and any possible implementation manner, an implementation manner is further provided, where the determining, by the PGW, a target bearer corresponding to the downlink message to be forwarded according to the address mapping relationship includes:
the PGW acquires an address of a network application and/or an address of the user equipment carried in the downlink message to be forwarded;
the PGW acquires an address of the terminal equipment corresponding to the address of the network application and/or the address of the user equipment according to the address mapping relation;
and the PGW acquires a bearer corresponding to the address of the terminal equipment to serve as the target bearer.
As to the above-mentioned aspect and any possible implementation manner, there is further provided an implementation manner, where the forwarding, by the PGW, the downlink message to be forwarded to a first destination address through the target bearer includes:
the PGW forwards the downlink message to be forwarded to the terminal device through the target bearer;
and the terminal equipment forwards the received message to be forwarded to the user equipment according to the address of the user equipment.
The foregoing aspect and any possible implementation manner further provide an implementation manner, where the uplink message to be forwarded is sent to the PGW by a user equipment through the terminal device, and the second destination address is an address of a network application.
As for the above aspect and any possible implementation manner, there is further provided an implementation manner, where the determining, by the terminal device, a target bearer corresponding to the uplink message to be forwarded according to the address mapping relationship includes:
the terminal equipment acquires the address of the LWA gateway corresponding to the address of the network application and/or the address of the user equipment according to the address mapping relation;
and the terminal equipment acquires the bearer corresponding to the address of the LWA gateway to be used as the target bearer.
As for the above-mentioned aspect and any possible implementation manner, there is further provided an implementation manner in which the terminal device forwards the message to be forwarded to the second destination address through the destination bearer, including:
the terminal equipment sends the uplink message to be forwarded to the PGW through the target bearer;
the PGW forwards the received uplink message to be forwarded to the LWA gateway through the target bearer;
and the LWA gateway forwards the received uplink message to be forwarded to the network application according to the address of the network application.
The above-described aspects and any possible implementations further provide an implementation in which the address mapping includes an address of an LWA gateway.
As for the above-mentioned aspect and any possible implementation manner, further providing an implementation manner, before the determining, by the terminal device, the target bearer corresponding to the uplink message to be forwarded according to the address mapping relationship, the method includes:
the terminal equipment determines the address of the LWA gateway corresponding to the address of the network application according to the address mapping relation;
the terminal device updates a TFT template to cause the network application address to replace the address of the LWA gateway.
As for the above aspect and any possible implementation manner, there is further provided an implementation manner, where the determining, by the terminal device, a target bearer corresponding to the uplink message to be forwarded according to the address mapping relationship includes:
and the terminal equipment acquires the load corresponding to the address of the network application as the target load.
As for the above-mentioned aspect and any possible implementation manner, there is further provided an implementation manner that forwards the uplink message to be forwarded to the second destination address through the destination bearer, including:
the terminal equipment sends the uplink message to be forwarded to the PGW through the target bearer;
and the PGW forwards the received uplink message to be forwarded to the network application according to the address of the network application.
One of the above technical solutions has the following beneficial effects:
in the embodiment of the invention, when a WLAN communication link is released, at least one of an LWA gateway and a terminal device sends an address mapping relation stored by the LWA gateway and the terminal device to a PGW, so that the PGW does not need to additionally package an IP tunnel when receiving a downlink message to be forwarded, and can determine a target bearer used by the downlink message to be forwarded based on the received address mapping relation and a target address and a source address carried in the downlink message to be forwarded, and further, the target bearer is utilized to transmit the downlink message to be forwarded; similarly, when the terminal device receives the uplink message to be forwarded, the terminal device does not need to encapsulate the IP tunnel, but determines a target bearer based on the address mapping relationship and transmits the uplink message to be forwarded by using the target bearer. The communication mode not only simplifies the processing procedure of the network element, but also avoids the waste of communication resources and improves the network performance.
In another aspect, an embodiment of the present invention provides a communication system, where the communication system includes: the method comprises the steps that a mobile communication network and a Wireless Local Area Network (WLAN) gateway, a Public Data Network (PDN) gateway and a terminal device are aggregated, a WLAN communication link is established between the LWA gateway and the terminal device, and the LWA gateway establishes a mobile communication link with the terminal device through the PGW;
the LWA gateway and/or the terminal device are configured to send, in response to the WLAN communication link being released, an address mapping relationship stored in the LWA gateway and/or the terminal device to the PGW, where the address mapping relationship is used to indicate a correspondence relationship between addresses of devices in the communication system;
the PGW is configured to receive the address mapping relationship; and, in response to receiving a downlink to-be-forwarded message, the PGW determines, according to the address mapping relationship, a target bearer corresponding to the downlink to-be-forwarded message, and forwards, through the target bearer, the downlink to-be-forwarded message to a first target address;
and the terminal equipment is also used for responding to the received uplink message to be forwarded, determining a target bearer corresponding to the uplink message to be forwarded according to the address mapping relation, and forwarding the uplink message to be forwarded to a second target address through the target bearer.
One of the above technical solutions has the following beneficial effects:
in the embodiment of the invention, when a WLAN communication link is released, at least one of an LWA gateway and a terminal device sends an address mapping relation stored by the LWA gateway and the terminal device to a PGW, so that the PGW does not need to additionally package an IP tunnel when receiving a downlink message to be forwarded, and can determine a target bearer used by the downlink message to be forwarded based on the received address mapping relation and a target address and a source address carried in the downlink message to be forwarded, and further, the target bearer is utilized to transmit the downlink message to be forwarded; similarly, when the terminal device receives the uplink message to be forwarded, the terminal device does not need to encapsulate the IP tunnel, but determines a target bearer based on the address mapping relationship and transmits the uplink message to be forwarded by using the target bearer. The communication mode not only simplifies the processing procedure of the network element, but also avoids the waste of communication resources and improves the network performance.
[ description of the drawings ]
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a system architecture diagram of an LWA communication system provided by an embodiment of the present invention;
fig. 2 is a schematic information interaction flow diagram of a communication method according to an embodiment of the present invention;
fig. 3 is a schematic information interaction flow diagram of another communication method provided by an embodiment of the present invention;
fig. 4 is a schematic information interaction flow diagram of another communication method provided by the embodiment of the present invention;
fig. 5 is a schematic information interaction flow diagram of another communication method provided by the embodiment of the present invention;
fig. 6 is a schematic information interaction flow diagram of another communication method provided by the embodiment of the present invention;
fig. 7 is a schematic information interaction flow diagram of another communication method according to an embodiment of the present invention.
[ detailed description ] embodiments
For better understanding of the technical solutions of the present invention, the following detailed descriptions of the embodiments of the present invention are provided with reference to the accompanying drawings.
It should be understood that the described embodiments are only some embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the examples of the present invention and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
It should be understood that the term "and/or" as used herein is merely one type of association that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.
The word "if" as used herein may be interpreted as "at … …" or "when … …" or "in response to a determination" or "in response to a detection", depending on the context. Similarly, the phrases "if determined" or "if detected (a stated condition or event)" may be interpreted as "when determined" or "in response to a determination" or "when detected (a stated condition or event)" or "in response to a detection (a stated condition or event)", depending on the context.
Aiming at the problems that in the prior art, when a WLAN communication link is released, LTE communication is carried out in an IP tunnel encapsulation mode, the network element processing flow is complex and communication resources are wasted, the embodiment of the invention provides the following solution ideas: when the WLAN communication link in the LWA communication system is released, only one mobile communication link remains, and then IP tunnel encapsulation is not needed to be performed repeatedly, at this time, since IP tunnel encapsulation is not performed, the data to be forwarded only includes the source address and the destination address, and it cannot be determined which bearer corresponds to the destination address, therefore, an address mapping relationship for indicating a correspondence relationship between device addresses in the communication system may be stored in the LWA gateway and/or the terminal device in advance, so that when the WLAN communication link is released, the address mapping relationship may be sent to the PGW, and thus, when the PGW performs data forwarding, the destination bearer corresponding to the destination address may be determined.
Under the guidance of this idea, the present embodiment provides the following feasible embodiments.
Example one
The embodiment of the invention provides a communication method, which is applied to a communication system comprising a mobile communication network, a wireless local area network (LWA) aggregation gateway, a Packet Data Network (PDN) gateway (PGW) and terminal equipment. And a Wireless Local Area Network (WLAN) communication link is established between the LWA gateway and the terminal equipment, and the LWA gateway establishes a mobile communication link with the terminal equipment through the PGW.
At this time, reference may be made to a system architecture diagram of an LWA communication system for data transmission between an Internet Application (APP) and a user equipment shown in fig. 1. As shown in fig. 1, a mobile communication link may be established between the network application and the user equipment through an LWA GateWay, a PGW, a Serving GateWay (SGW), an evolved nodeb (eNB), and a terminal device to perform communication, and meanwhile, a WLAN communication link may also be established between the network application and the user equipment through the LWA GateWay, a Wireless Access Point (AP), and the terminal device.
The mobile communication link according to the embodiment of the present invention may include, but is not limited to: an LTE communication link.
Wherein the number of user equipments is at least one. Three user devices are shown in fig. 1 for ease of understanding. The types of the user equipment related to the embodiment of the present invention may include, but are not limited to: personal Computers (PCs), Personal Digital Assistants (PDAs), wireless handsets, Tablet computers (tablets), cell phones, and the like.
In a specific implementation scenario, the terminal device may be a UE or a Customer Premises Equipment (CPE).
It should be noted that, the embodiment of the present invention is not particularly limited to the devices included in the mobile communication link and the WLAN communication link. For example, in a specific application scenario, a Wireless Access Point Controller (AC) may be further disposed in the WLAN communication link, and connected between the LWA gateway and the AP, so as to centrally control the Wireless AP.
Based on the communication system shown in fig. 1, a communication method provided by an embodiment of the present invention may refer to fig. 2, where the method includes:
s202, responding to the WLAN communication link being released, the LWA gateway and/or the terminal device sends the address mapping relation stored by the LWA gateway and/or the terminal device to the PGW, wherein the address mapping relation is used for indicating the corresponding relation between the device addresses in the communication system.
S204, the PGW receives the address mapping relation.
S206A, in response to receiving the downlink to-be-forwarded message, the PGW determines, according to the address mapping relationship, a target bearer corresponding to the downlink to-be-forwarded message, and forwards the downlink to-be-forwarded message to the first target address through the target bearer.
S206B, in response to receiving the uplink message to be forwarded, the terminal device determines a target bearer corresponding to the uplink message to be forwarded according to the address mapping relationship, and forwards the uplink message to be forwarded to the second target address through the target bearer.
It can be understood that S206A and S206B are two different processing manners of the message to be forwarded, and the execution order of the two is not limited by a special sequence. The uplink message to be forwarded is a message sent by the user equipment to the network application; the downlink message to be forwarded is a message sent by the network application to the user equipment. The dotted line in fig. 2 indicates that there is no limitation on the sender of the currently received uplink message to be forwarded or the currently received downlink message to be forwarded. For example, the source address of the downlink message to be forwarded received by the PGW is the network application, and at this time, the downlink message to be forwarded received by the PGW may be directly sent by the network application, or may also be forwarded by the network application through the LWA gateway.
In the embodiment of the present invention, the address mapping relationship may be stored in at least one of the LWA gateway and the terminal device, and based on this, when the WLAN communication link is released, both of them may send the address mapping relationship stored in themselves to the PGW. For ease of understanding, the step S202 in fig. 2 is shown as a dashed line to indicate that this step may be implemented by at least one of the two. And, in the actual implementation scenario, the address mapping relationship may be pre-stored, or may also be generated when the communication system is established.
Since the address mapping relationship is used to represent the corresponding relationship between the addresses of the devices in the communication system, the expression form of the address mapping relationship may be different based on the different architectures of the communication systems.
For convenience of description, the address of the network application according to the embodiment of the present invention is briefly described as follows: the APP address, the address of the user equipment is briefly described as follows: the user address and the address of the terminal device are briefly described as follows: the address of the UE and the address of the LWA gateway are briefly described as follows: an LWA address; the mapping relationship is denoted as { }.
Specifically, the address mapping relationship may be a correspondence relationship between an address of the user equipment, an address of the terminal equipment, an address of the LWA gateway, and an address of the network application. This may include, but is not limited to: { user address-UE address-APP address }, { user address-UE address-APP address-LWA address }, { user address-UE address }, { UE address-APP address }, { APP address-LWA address }, and { user address-LWA address }.
Or, in another implementation scenario, after the WLAN communication link is released, the network application and the user equipment communicate via the mobile communication link, and at this time, the LWA gateway is used to forward data, so that, to simplify a data forwarding procedure, data forwarding may be directly performed between the PGW and the network application. Then, at this time, the address mapping relationship may not include the address of the LWA gateway, that is, the address mapping relationship is a correspondence relationship between the address of the user equipment, the address of the terminal equipment, and the address of the network application.
Based on this, the address mapping relationship at this time may include, but is not limited to: { user address-UE address-APP address }, { user address-UE address }, and { UE address-APP address }.
In an implementation scenario, referring to fig. 3, the communication method further includes the following steps:
s205, the PGW stores the address mapping relation.
Therefore, the address mapping relation can be sent only once after the WLAN communication link in the LWA communication system is released, and the address mapping relation does not need to be sent again when communication is carried out only through the mobile communication link subsequently, so that the effects of simplifying a data forwarding flow and saving communication resources can be achieved to a certain extent.
The message to be forwarded according to the embodiment of the present invention may be an uplink message (the ue sends to the network application) or a downlink message (the network application sends to the ue). Hereinafter, the steps S206A and S206B will be described based on the type of the message to be forwarded.
On one hand, when receiving the downstream message to be forwarded, the PGW executes S206A, which may include but is not limited to the following two implementation manners:
the first implementation of S206A is performed: and the downlink message to be forwarded is sent to the PGW by the network application through the LWA gateway, and the first target address is the address of the user equipment. At this time, the address of the network application is the source address of the downlink message to be forwarded. And the LWA gateway is only used for forwarding the downlink message to be forwarded, which is sent by the network application, to the PGW. At this time, please refer to fig. 4.
As shown in fig. 4, before executing the step S206A, the method further includes the following steps:
s20601, the network application issues the message to be forwarded to the LWA gateway.
And S20602, the LWA gateway forwards the downlink message to be forwarded to the PGW.
The second implementation of S206A is performed: and the downlink message to be forwarded is sent to the PGW by the network application, and the first target address is the address of the user equipment. At this time, the address of the network application is the source address of the downlink message to be forwarded. And, the network application communicates directly with the PGW. Please refer to fig. 5.
As shown in fig. 5, the downlink message to be forwarded at this time is directly sent to the PGW by the network application, and before this, the following steps need to be performed:
s2060, the network application updates the address of the next hop from the address of the LWA gateway to the address of the PGW.
Wherein the implementation of this step is triggered by the LWA gateway. For example, the LWA gateway may send a message telling the network application to update the next hop address.
In the LWA communication system, the next hop of the network application is defined as the LWA gateway by default, but when the WLAN communication link is released and only one mobile communication link remains, the step of forwarding data by the LWA gateway can be omitted, and therefore, the network application needs to update the next hop address.
Based on this, S20600 is executed again, and the network application issues the message to be forwarded to the PGW.
It should be noted that, in the two implementation scenarios shown in fig. 4 and fig. 5, the address mapping relationship necessarily includes the address (UE address) of the terminal device. The address mapping relationships that may be utilized at this time may include, but are not limited to: { user address-UE address }, { user address-UE address-APP address }, and { UE address-APP address }.
Based on this, as shown in fig. 4 or fig. 5, the step of S206A is executed, which may include the following steps:
s206a1, in response to receiving the downlink message to be forwarded, the PGW obtains the address of the network application and/or the address of the user equipment carried in the downlink message to be forwarded.
S206a2, the PGW obtains the address of the terminal device corresponding to the address of the network application and/or the address of the user equipment according to the address mapping relationship.
Based on at least one of the address mapping relations and at least one of the APP address and the user address obtained in S206a1, the UE address corresponding to the APP address and the user address can be determined.
S206a3, the PGW obtains a bearer corresponding to the address of the terminal device, so as to serve as a target bearer.
In a specific implementation process, the target bearer is determined by using the terminal device address and the LWA gateway address (communication passes through the LWA gateway) or by using the terminal device address and the network application address (communication does not pass through the LWA gateway).
S206a4, forwarding, by the PGW, the downlink to-be-forwarded message to the terminal device through the target bearer;
s206a5, the terminal device forwards the received downlink message to be forwarded to the user equipment according to the address of the user equipment.
On the other hand, when the terminal device receives the uplink message to be forwarded, the uplink message to be forwarded is sent to the PGW by the user device through the terminal device, and the second target address is an address of the network application. At this time, the address of the user equipment is the source address of the uplink message to be forwarded.
Specifically, as shown in fig. 6 or fig. 7, before executing the step S206B, the method further includes the following steps:
s206000, the user equipment sends the message to be forwarded in uplink to the terminal equipment.
When the terminal device receives the uplink message to be forwarded and executes step S206B, the embodiment of the present invention provides the following two implementation manners:
the first implementation of S206B is performed: and the terminal equipment forwards the message to be forwarded to the LWA gateway through the PGW, and the LWA gateway forwards the message to the address of the network application.
At this time, referring to fig. 6, when the step S206B is executed, the following steps may be included:
and S206B1, in response to receiving the uplink message to be forwarded, the terminal equipment acquires the address of the LWA gateway corresponding to the address of the network application and/or the address of the user equipment according to the address mapping relation.
It should be noted that the address mapping at this time necessarily includes the address of the LWA gateway (LWA address). The address mapping relationships that may be utilized at this time may include, but are not limited to: { user address-LWA address }, { user address-LWA address-APP address }, and { LWA address-APP address }.
Based on at least one of the address mapping relations and at least one of the APP address and the user address obtained in S206B1, the LWA address corresponding to the APP address and the user address can be determined.
S206B2, the terminal device obtains a bearer corresponding to the address of the LWA gateway, and uses the bearer as a target bearer.
And S208B3, the terminal equipment forwards the uplink message to be forwarded to the PGW through the target bearer.
S208B4, the PGW forwards the received uplink message to be forwarded to the LWA gateway through the target bearer.
And S208B5, the LWA gateway forwards the received uplink message to be forwarded to the network application according to the address of the network application.
The second implementation of S206B is performed: the PGW directly forwards the message to be forwarded to the address of the network application.
At this time, referring to fig. 7, when the step S206B is executed, the following steps may be included:
and S206B6, in response to receiving the uplink message to be forwarded, the terminal equipment determines the address of the LWA gateway corresponding to the address of the network application according to the address mapping relation.
S206B7, the terminal device updates the TFT template so that the address of the network application replaces the address of the LWA gateway.
S206B8, the terminal device obtains a bearer corresponding to the address of the network application, and uses the bearer as a target bearer.
S206B9, the terminal device sends the uplink message to be forwarded to the PGW through the target bearer.
S206B10, the PGW forwards the received uplink message to be forwarded to the network application according to the address of the network application.
In the implementation mode, additional forwarding through the LWA gateway is not needed, so that the information transmission step in the communication process can be simplified, the data forwarding efficiency can be improved to a certain extent, and the communication quality is improved.
It should be noted that the numbering in the different figures as described above does not correspond to the numbering in the sequence. For example, S206B1 in fig. 6 and S206B6 in fig. 7 are only used for distinguishing implementation steps, and there is no restriction on the order of precedence.
The technical scheme of the embodiment of the invention has the following beneficial effects:
in the embodiment of the invention, when a WLAN communication link is released, at least one of an LWA gateway and a terminal device sends an address mapping relation stored by the LWA gateway and the terminal device to a PGW, so that the PGW does not need to additionally package an IP tunnel when receiving a downlink message to be forwarded, and can determine a target bearer used by the downlink message to be forwarded based on the received address mapping relation and a target address and a source address carried in the downlink message to be forwarded, and further, the target bearer is utilized to transmit the downlink message to be forwarded; similarly, when the terminal device receives the uplink message to be forwarded, the terminal device does not need to encapsulate the IP tunnel, but determines a target bearer based on the address mapping relationship and transmits the uplink message to be forwarded by using the target bearer. The communication mode not only simplifies the processing procedure of the network element, but also avoids the waste of communication resources and improves the network performance.
Example two
Based on the communication method provided by the first embodiment, the embodiment of the invention further provides a communication system. Referring to fig. 1, the communication system includes: the method comprises the steps that an LWA gateway, a PGW and a terminal device are adopted, a wireless local area network WLAN communication link is established between the LWA gateway and the terminal device, and a mobile communication link is established between the LWA gateway and the terminal device through the PGW;
the LWA gateway and/or the terminal equipment are/is used for responding to the release of the WLAN communication link and sending the address mapping relation stored by the LWA gateway and/or the terminal equipment to the PGW, and the address mapping relation is used for indicating the corresponding relation between the addresses of the equipment in the communication system;
the PGW is used for receiving the address mapping relation; the PGW is also used for responding to the received downlink message to be forwarded, determining a target bearer corresponding to the downlink message to be forwarded according to the address mapping relation, and forwarding the downlink message to be forwarded to the first target address through the target bearer;
and the terminal equipment is also used for responding to the received uplink message to be forwarded, determining a target bearer corresponding to the uplink message to be forwarded according to the address mapping relation, and forwarding the uplink message to be forwarded to a second target address through the target bearer.
Since each unit in the present embodiment can execute the method shown in fig. 2, reference may be made to the related description of fig. 2 for a part of the present embodiment that is not described in detail.
The technical scheme of the embodiment of the invention has the following beneficial effects:
in the embodiment of the invention, when a WLAN communication link is released, at least one of an LWA gateway and a terminal device sends an address mapping relation stored by the LWA gateway and the terminal device to a PGW, so that the PGW does not need to additionally package an IP tunnel when receiving a downlink message to be forwarded, and can determine a target bearer used by the downlink message to be forwarded based on the received address mapping relation and a target address and a source address carried in the downlink message to be forwarded, and further, the target bearer is utilized to transmit the downlink message to be forwarded; similarly, when the terminal device receives the uplink message to be forwarded, the terminal device does not need to encapsulate the IP tunnel, but determines a target bearer based on the address mapping relationship and transmits the uplink message to be forwarded by using the target bearer. The communication mode not only simplifies the processing procedure of the network element, but also avoids the waste of communication resources and improves the network performance.
It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the embodiments provided in the present invention, it should be understood that the disclosed system, apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and there may be other divisions in actual implementation, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, or in a form of hardware plus a software functional unit.
The integrated unit implemented in the form of a software functional unit may be stored in a computer readable storage medium. The software functional unit is stored in a storage medium and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device) or a Processor (Processor) to execute some steps of the methods according to the embodiments of the present invention. And the aforementioned storage medium includes: various media capable of storing program codes, such as a usb disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims (17)

1. A communication method is applied to a communication system comprising a mobile communication network and a wireless local area network aggregation (LWA) gateway, a packet data network gateway (PGW) and a terminal device, wherein a Wireless Local Area Network (WLAN) communication link is established between the LWA gateway and the terminal device, and the LWA gateway establishes a mobile communication link with the terminal device through the PGW; the method comprises the following steps:
in response to the WLAN communication link being released, the LWA gateway and/or the terminal device sends an address mapping relationship stored by itself to the PGW, where the address mapping relationship is used to indicate a correspondence relationship between device addresses in the communication system;
the PGW receives the address mapping relation;
in response to receiving a downlink message to be forwarded, the PGW determines, according to the address mapping relationship, an address of a terminal device corresponding to a network application address and/or an address of a user equipment carried in the downlink message to be forwarded, acquires, according to the address of the terminal device, a target bearer corresponding to the address of the terminal device, and forwards, through the target bearer, the downlink message to be forwarded to the address of the user equipment;
in response to receiving the uplink message to be forwarded, the terminal device determines, according to the address mapping relationship, an address of an LWA gateway corresponding to an address of a network application and/or an address of a user device carried in the uplink message to be forwarded, acquires, according to the address of the LWA gateway, a target bearer corresponding to the address of the LWA gateway, and forwards the uplink message to be forwarded to the address of the network application through the target bearer.
2. The method according to claim 1, wherein the address mapping relationship is a correspondence relationship between an address of a user equipment, an address of a terminal equipment, an address of an LWA gateway, and an address of a network application.
3. The method according to claim 1, wherein the address mapping relationship is a correspondence relationship between an address of the user equipment, an address of the terminal equipment and an address of the network application.
4. The method of claim 1, further comprising:
the PGW stores the address mapping relationship.
5. The method according to claim 1, wherein the downstream message to be forwarded is sent by a network application to the PGW via the LWA gateway.
6. The method of claim 1, wherein the downstream message to be forwarded is sent to the PGW by a network application.
7. The method according to claim 6, wherein before the PGW determines, according to the address mapping relationship, a target bearer corresponding to the downlink message to be forwarded, the method further includes:
and the PGW updates a filter template TFT so that the address of the network application replaces the address of the LWA gateway.
8. The method according to claim 7, wherein before the PGW determines, according to the address mapping relationship, a target bearer corresponding to the downlink message to be forwarded, the method further includes:
and the network application updates the address of the next hop from the address of the LWA gateway to the address of the PGW.
9. The method according to claim 5 or 6, wherein the address mapping relationship comprises the address of the terminal device.
10. The method according to claim 1, wherein the forwarding, by the PGW, the downlink message to be forwarded to an address of a user equipment through the target bearer includes:
the PGW forwards the downlink message to be forwarded to the terminal device through the target bearer;
and the terminal equipment forwards the received message to be forwarded to the user equipment according to the address of the user equipment.
11. The method of claim 1, wherein the uplink message to be forwarded is sent to the PGW by a user equipment via the terminal device.
12. The method of claim 1, wherein the forwarding, by the terminal device, the message to be forwarded to an address of a network application through the target bearer comprises:
the terminal equipment sends the uplink message to be forwarded to the PGW through the target bearer;
the PGW forwards the received uplink message to be forwarded to the LWA gateway through the target bearer;
and the LWA gateway forwards the received uplink message to be forwarded to the network application according to the address of the network application.
13. The method of claim 1, wherein the address mapping comprises an address of an LWA gateway.
14. The method according to claim 11, wherein before the terminal device determines the target bearer corresponding to the uplink message to be forwarded according to the address mapping relationship, the method includes:
the terminal equipment determines the address of the LWA gateway corresponding to the address of the network application according to the address mapping relation;
the terminal device updates a TFT template to cause the address of the network application to replace the address of the LWA gateway.
15. The method according to claim 14, wherein the determining, by the terminal device, the target bearer corresponding to the uplink message to be forwarded according to the address mapping relationship includes:
and the terminal equipment acquires the load corresponding to the address of the network application as the target load.
16. The method according to claim 1 or 14, wherein the determining, by the terminal device, the target bearer corresponding to the uplink message to be forwarded according to the address mapping relationship includes:
the terminal equipment sends the uplink message to be forwarded to the PGW through the target bearer;
and the PGW forwards the received uplink message to be forwarded to the network application according to the address of the network application.
17. A communication system, the communication system comprising: the method comprises the steps that a mobile communication network and a wireless local area network (LWA) gateway, a packet data network (PGW) and a terminal device are aggregated, a Wireless Local Area Network (WLAN) communication link is established between the LWA gateway and the terminal device, and the LWA gateway establishes a mobile communication link with the terminal device through the PGW;
the LWA gateway and/or the terminal device are configured to send, in response to the WLAN communication link being released, an address mapping relationship stored in the LWA gateway and/or the terminal device to the PGW, where the address mapping relationship is used to indicate a correspondence relationship between addresses of devices in the communication system;
the PGW is configured to receive the address mapping relationship; the PGW is further configured to, in response to receiving a downlink to-be-forwarded message, determine, according to the address mapping relationship, an address of a terminal device corresponding to a network application address and/or an address of a user equipment carried in the downlink to-be-forwarded message, acquire, according to the address of the terminal device, a target bearer corresponding to the address of the terminal device, and forward, through the target bearer, the downlink to-be-forwarded message to the address of the user equipment;
the terminal device is further configured to, in response to receiving the uplink to-be-forwarded message, determine, by the terminal device according to the address mapping relationship, an address of an LWA gateway corresponding to an address of a network application and/or an address of a user equipment, which are/is carried in the uplink to-be-forwarded message, obtain, according to the address of the LWA gateway, a target bearer corresponding to the address of the LWA gateway, and forward the uplink to-be-forwarded message to the address of the network application through the target bearer.
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