CN106332189B - Method and device for realizing forwarding data - Google Patents

Method and device for realizing forwarding data Download PDF

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Publication number
CN106332189B
CN106332189B CN201510370345.0A CN201510370345A CN106332189B CN 106332189 B CN106332189 B CN 106332189B CN 201510370345 A CN201510370345 A CN 201510370345A CN 106332189 B CN106332189 B CN 106332189B
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base station
forwarding tunnel
forwarding
service gateway
management unit
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CN106332189A (en
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卢飞
朱进国
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ZTE Corp
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ZTE Corp
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Priority to PCT/CN2016/082514 priority patent/WO2017000694A1/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/12—Reselecting a serving backbone network switching or routing node
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0011—Control or signalling for completing the hand-off for data sessions of end-to-end connection
    • H04W36/0033—Control or signalling for completing the hand-off for data sessions of end-to-end connection with transfer of context information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/02—Traffic management, e.g. flow control or congestion control
    • H04W28/10—Flow control between communication endpoints
    • H04W28/14—Flow control between communication endpoints using intermediate storage

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  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

The invention discloses a method for realizing forwarding data, which comprises the following steps: in the updating process of the tracking area, a target mobile management unit sends a request message for requesting to establish a forwarding tunnel to a base station; the forwarding tunnel is used for forwarding the data cached on the original service gateway to the base station; after receiving the response message carrying the base station end information of the forwarding tunnel returned by the base station, the destination mobile management unit sends the information to the relevant network element to establish the forwarding tunnel. The invention discloses a method for realizing forwarding data, which comprises the following steps: in the updating process of the tracking area, the target service gateway acquires the first data cached on the original service gateway, and after all the first data cached on the original service gateway is sent to the base station, the second data acquired from the packet data network gateway is sent to the base station. The invention can solve the problem that the base station can not receive the cached data on the original service gateway and receive the data out of order in the updating process of the tracking area. The invention also discloses a device for realizing the data forwarding.

Description

Method and device for realizing forwarding data
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a method and an apparatus for implementing data forwarding.
Background
The standardization group of the third Generation Partnership Project (3rd Generation Partnership Project, abbreviated as 3GPP) is currently working on the Evolution of Packet switched Core Network (Packet Switch Core, abbreviated as PS Core) and Universal Mobile telecommunications System radio access Network (UTRAN), which is called System Architecture Evolution (SAE) and aims to enable Evolved Packet Network (EPC) to provide higher transmission rate, generate shorter transmission delay, and optimize Packet and mobility management between UTRAN, Wireless Local Area Network (WLAN) and other non-3 GPP access networks.
The current architecture of SAE is shown in fig. 1, which includes the following network elements: evolved radio access Network (evolved RAN, abbreviated as E-RAN), Packet Data Network (PDN), evolved Packet Network (E-Packet Core). The evolved packet network comprises the following network elements: a Mobility Management Entity (MME), in a UMTS system, a Mobility management unit is an SGSN (Serving GPRS Support Node); a Serving Gateway (SGW); a packet data network gateway (PDNGateway, PGW for short); policy and Charging Rules Function (Policy and Charging Rules Function, abbreviated as PCRF); a Home Subscriber Server (HSS for short).
In the prior art, a UE may be in a Power saving state (PSM for short), in which an MME cannot page the UE and the UE is also in an unreachable state, and at this time, if the SGW receives downlink data, the SGW learns that the UE is in the unreachable state, and the SGW caches the data. When the UE moves to a new MME in an idle state, and the new MME selects a new SGW, the original SGW needs to forward data so that the UE can receive the buffered data, and fig. 2 shows a step of forwarding data in a Tracking area update (Tracking area update, abbreviated as TAU) in the prior art:
step S201, UE sends TAU request message to eNodeB, the message includes user' S Globally Unique Temporary Identity (GUTI);
step S202, eNodeB selects MME and forwards TAU request message to newly selected target MME;
step S203, the target MME acquires the original MME corresponding to the UE according to the GUTI carried in the TAU request, and sends a context request message to the original MME, wherein the original GUTI acquired in the step S202 is carried in the context request message;
step S204, the original MME returns a context response message to the target MME, and the message carries the Mobility Management (MM) context and the bearing context of the UE; if downlink data are cached in the SGW, the original MME needs to indicate the data cache to be transmitted in the context response message;
step S205, the destination MME reselects a new SGW and sends a session establishment request message to the destination SGW, where the message carries a control plane ip (internet protocol) address and a Tunnel Endpoint Identifier (TEID) of the MME, an International user identifier (IMSI) of the UE, and bearer context information of the UE;
step S206, the target SGW sends a bearer updating request message to the PGW, wherein the message carries the control plane IP address and TEID of the SGW, and the S5 interface downlink user plane IP address and TEID of the SGW;
step S207, the PGW returns an update bearer response message to the destination SGW; the PGW sends an End of data marker (End marker) to the original SGW;
step S208, the target SGW returns a session establishment response message to the target MME, wherein the message carries the IP address and TEID of the control plane of the SGW, and the IP address and TEID of the user plane of the uplink SGW of the S1-U interface;
step S209, the target MME returns a TAU accept message to the UE, where the message carries the re-allocated GUTI and Tracking Area Identity (TAI) list, and after receiving the new GUTI, the UE needs to return a TAU complete message to the MME;
step S210, the target MME sends a request message for establishing context to the eNodeB, and the message carries the user plane IP address and TEID of the uplink SGW of the S1-U interface;
step S211, the eNodeB sends a context establishing response message to the MME, wherein the message carries the user plane IP address and TEID of the downlink eNodeB of the S1-U interface;
step S212, the destination MME sends a bearer updating request message to the destination SGW, wherein the message carries the user plane IP address and TEID of the S1-U interface downlink eNodeB acquired in step S211;
step S213, the target SGW returns a response message of updating the load to the target MME;
step S214, the target MME selects a forwarding anchor SGW and sends a request message for establishing a forwarding tunnel to the forwarding anchor SGW, wherein the message carries IMSI, and the user plane IP address and TEID of the S1-U interface downlink eNodeB acquired in step S211;
the forwarding anchor point SGW may be a different SGW from the destination SGW, or may be the same SGW as the destination SGW; in fig. 2, the forwarding anchor SGW is the same SGW as the destination SGW;
step S215, the forwarding anchor SGW returns a response message for establishing a forwarding tunnel to the target MME, wherein the message carries the forwarding IP address and TEID of the forwarding anchor SGW;
step S216, the target MME returns a context confirmation message to the original MME, if the step S214 and the step S215 are executed, the context confirmation message carries the forwarding IP address and the TEID of the forwarding anchor SGW acquired in the step S215; if step S214, S215 are not executed, the context acknowledgement message carries the user plane IP address and TEID of the S1-U interface downlink eNodeB acquired in step S211;
step S217, the original MME sends a load updating request message to the original SGW, wherein the message carries the user plane IP address and TEID obtained in step S216;
if step S214 and step S215 are executed, the user plane IP address and the TEID carried in the bearer update request message are the forwarding IP address and the TEID of the forwarding anchor SGW; if step S214 and step S215 are not executed, the user plane IP address and TEID carried in the bearer update request message are the user plane IP address and TEID of the S1-U interface downlink eNodeB;
step S218, the original SGW returns a bearer update response message to the MME,
step S219, the original MME sends a session release request message to the original SGW; the original SGW releases all information of the UE;
step S220, the original SGW sends a release session response message to the original MME.
In this way, the downlink data buffered in the original SGW may be forwarded through the path original SGW- > eNodeB (shown by a solid and thick line in the figure), or may be forwarded through the path original SGW- > forwarding anchor point SGW- > eNodeB (shown by a dotted and thick line in the figure).
From the above steps, it can be seen that since the eNodeB does not know that the network side will establish the forwarding tunnel for the eNodeB, if a filtering software such as a firewall is installed on the eNodeB, the eNodeB may discard the data on the forwarding tunnel that is not established by the eNodeB (i.e., the eNodeB may discard the data forwarded from the original SGW or the forwarding anchor SGW). On the other hand, even though the eNodeB can receive the data from the forwarding tunnel and the data from the destination SGW, the data received from the two different transmitting parties may affect each other to cause disorder, and the received data cannot be normally analyzed.
In view of the above problems, no solution is currently available.
Disclosure of Invention
The technical problem to be solved by the present invention is to provide a method, an apparatus and a system for implementing data forwarding, which can solve the problem that a base station cannot receive data cached on an original serving gateway and receive data out of order in the process of updating a tracking area.
In order to solve the above technical problem, the present invention provides a method for implementing data forwarding, including:
in the updating process of the tracking area, a target mobile management unit sends a request message for requesting to establish a forwarding tunnel to a base station; the forwarding tunnel is used for forwarding the data cached on the original service gateway to the base station;
and after receiving a response message which is returned by the base station and carries the base station end information of the forwarding tunnel, the target mobile management unit sends the base station end information of the forwarding tunnel to a related network element to establish the forwarding tunnel.
Further, the implementation method also comprises the following characteristics:
the destination mobile management unit sends a request message for requesting to establish a forwarding tunnel to the base station, and the request message comprises the following steps:
the target mobile management unit sends an initial context establishment request message to the base station, wherein the initial context establishment request message carries indication information for requesting to establish a forwarding tunnel.
Further, the implementation method also comprises the following characteristics:
after receiving a response message carrying base station end information of a forwarding tunnel returned by a base station, a destination mobile management unit sends the base station end information of the forwarding tunnel to a related network element to establish the forwarding tunnel, and the method comprises the following steps:
and after receiving an initial context establishment response message which is returned by the base station and carries the base station end information of the forwarding tunnel, the target mobile management unit sends the base station end information of the forwarding tunnel to a related network element to establish the forwarding tunnel.
Further, the implementation method also comprises the following characteristics:
sending the base station side information of the forwarding tunnel to a relevant network element to establish the forwarding tunnel, including:
sending the base station end information of the forwarding tunnel to an original mobile management unit, and then sending the base station end information of the forwarding tunnel to an original service gateway by the original mobile management unit so as to establish the forwarding tunnel between the base station and the original service gateway; or
And sending the base station side information of the forwarding tunnel to an anchor point service gateway for forwarding data to establish a forwarding tunnel between the anchor point service gateway and the base station, sending the anchor point service gateway side information of the forwarding tunnel to an original mobile management unit, and sending the anchor point service gateway side information of the forwarding tunnel to the original service gateway by the original mobile management unit to establish the forwarding tunnel between the anchor point service gateway and the original service gateway.
Further, the implementation method also comprises the following characteristics:
the base station side information of the forwarding tunnel comprises: forwarding the base station end IP address information and the tunnel endpoint identification TEID information of the tunnel.
Further, the implementation method also comprises the following characteristics:
the base station includes: an evolved node B;
the mobility management unit includes: a mobility management entity MME.
In order to solve the above technical problem, the present invention provides a method for implementing data forwarding, including:
in the updating process of the tracking area, the target service gateway acquires first data cached on the original service gateway;
and after the target service gateway sends all the first data cached on the original service gateway to the base station, the target service gateway sends second data acquired from the packet data network gateway to the base station.
Further, the implementation method also comprises the following characteristics:
the method for acquiring the first data cached on the original service gateway by the target service gateway comprises the following steps:
and the target service gateway receives the first data sent by the original service gateway, and judges that the first data cached on the original service gateway are completely received after the data end identifier is received.
Further, the implementation method also comprises the following characteristics:
the target service gateway sends the first data cached on the original service gateway to the base station, and then sends the second data acquired from the packet data network gateway to the base station, and the method comprises the following steps:
and if the end of data identification is not detected in the first data cached on the original service gateway received by the target service gateway, judging that the first data is not received completely, and caching the second data from the packet data network gateway by the target service gateway.
Further, the implementation method also comprises the following characteristics:
the end of data identifier is created by a packet data network gateway or by the original serving gateway.
Further, the implementation method also comprises the following characteristics:
the method for acquiring the first data cached on the original service gateway by the target service gateway comprises the following steps:
the target service gateway is used as a data forwarding anchor point service gateway to obtain first data from the original service gateway;
after the target mobile management unit learns that the base station does not support the establishment of the forwarding tunnel, the target service gateway is selected as a data forwarding anchor point service gateway; the forwarding tunnel is used for forwarding the data cached on the original service gateway to the base station.
Further, the implementation method also comprises the following characteristics:
the target mobile management unit learns that the base station does not support the establishment of the forwarding tunnel, and comprises the following steps:
the target mobile management unit sends an initial context establishment request message to the base station, wherein the initial context establishment request message carries indication information for requesting to establish a forwarding tunnel;
after receiving an initial context establishment response message returned by a base station, the destination mobility management unit learns that the base station does not support establishment of a forwarding tunnel if the initial context establishment response message does not contain base station side information of the forwarding tunnel.
Further, the implementation method also comprises the following characteristics:
the base station includes: an evolved node B;
the mobility management unit includes: a mobility management entity MME.
In order to solve the above technical problem, the present invention provides an apparatus for implementing data forwarding, which is applied to a mobility management unit, and includes:
a request module, which is used for serving as a target mobile management unit to send a request message for requesting to establish a forwarding tunnel to a base station in the process of updating the tracking area; the forwarding tunnel is used for forwarding the data cached on the original service gateway to the base station;
and the response receiving and processing module is used as a target mobile management unit for sending the base station end information of the forwarding tunnel to a related network element to establish the forwarding tunnel after receiving a response message which is returned by the base station and carries the base station end information of the forwarding tunnel.
Further, the implementation device also comprises the following characteristics:
a request module, configured to send a request message for requesting to establish a forwarding tunnel to a base station as a destination mobility management unit, including:
and the target mobile management unit sends an initial context establishment request message to the base station, wherein the initial context establishment request message carries indication information for requesting to establish a forwarding tunnel.
Further, the implementation device also comprises the following characteristics:
the response receiving and processing module is configured to, as a target mobile management unit, send base station side information of a forwarding tunnel to a related network element to establish the forwarding tunnel after receiving a response message carrying the base station side information of the forwarding tunnel returned by a base station, and includes:
and after receiving an initial context establishment response message which is returned by the base station and carries the base station end information of the forwarding tunnel, the target mobile management unit sends the base station end information of the forwarding tunnel to a related network element to establish the forwarding tunnel.
Further, the implementation device also comprises the following characteristics:
the response receiving and processing module is configured to send the base station side information of the forwarding tunnel to a relevant network element to establish the forwarding tunnel, and includes:
sending the base station end information of the forwarding tunnel to an original mobile management unit, and then sending the base station end information of the forwarding tunnel to an original service gateway by the original mobile management unit so as to establish the forwarding tunnel between the base station and the original service gateway; or
And sending the base station side information of the forwarding tunnel to an anchor point service gateway for forwarding data to establish a forwarding tunnel between the anchor point service gateway and the base station, sending the anchor point service gateway side information of the forwarding tunnel to an original mobile management unit, and sending the anchor point service gateway side information of the forwarding tunnel to the original service gateway by the original mobile management unit to establish the forwarding tunnel between the anchor point service gateway and the original service gateway.
Further, the implementation device also comprises the following characteristics:
the base station side information of the forwarding tunnel comprises: forwarding the base station end IP address information and the tunnel endpoint identification TEID information of the tunnel.
Further, the implementation device also comprises the following characteristics:
the base station includes: an evolved node B;
the mobility management unit includes: a mobility management entity MME.
In order to solve the above technical problem, the present invention provides an apparatus for implementing data forwarding, which is applied to a service gateway, and includes:
the data receiving module is used for serving as a target service gateway to acquire first data cached on an original service gateway in the updating process of the tracking area;
and the data sending module is used as a target service gateway to send all the first data cached on the original service gateway to the base station, and then send the second data acquired from the packet data network gateway to the base station.
Further, the implementation device also comprises the following characteristics:
the data receiving module is used as a destination service gateway to obtain first data cached on an original service gateway, and comprises:
and the target service gateway receives the first data sent by the original service gateway, and judges that all the first data cached on the original service gateway are received after the data end identifier is received.
Further, the implementation device also comprises the following characteristics:
a data sending module, configured to send, as a destination serving gateway, all the first data cached in the original serving gateway to a base station, and then send, to the base station, second data acquired from a packet data network gateway, where the data sending module includes:
and if the end of data identification is not detected in the first data cached on the original service gateway received by the target service gateway, judging that the first data is not received completely, and caching the second data from the packet data network gateway by the target service gateway.
Further, the implementation device also comprises the following characteristics:
the end of data identifier is created by a packet data network gateway or by the original serving gateway.
Further, the implementation device also comprises the following characteristics:
the data receiving module is used as a destination service gateway to obtain first data cached on an original service gateway, and comprises:
the target service gateway is used as a data forwarding anchor point service gateway to obtain first data from the original service gateway;
after the target mobile management unit learns that the base station does not support the establishment of the forwarding tunnel, the target service gateway is selected as a data forwarding anchor point service gateway; the forwarding tunnel is used for forwarding the data cached on the original service gateway to the base station.
Further, the implementation device also comprises the following characteristics:
the target mobile management unit learns that the base station does not support the establishment of the forwarding tunnel, and comprises the following steps:
the target mobile management unit sends an initial context establishment request message to the base station, wherein the initial context establishment request message carries indication information for requesting to establish a forwarding tunnel;
after receiving an initial context establishment response message returned by a base station, the destination mobility management unit learns that the base station does not support establishment of a forwarding tunnel if the initial context establishment response message does not contain base station side information of the forwarding tunnel.
Further, the implementation device also comprises the following characteristics:
the base station includes: an evolved node B;
the mobility management unit includes: a mobility management entity MME.
Compared with the prior art, in the method and the device for realizing the forwarding data, the target mobile management unit sends a request message for requesting to establish the forwarding tunnel to the base station in the updating process of the tracking area, after receiving a response message which is returned by the base station and carries the base station side information of the forwarding tunnel, the base station side information of the forwarding tunnel is sent to the related network element to establish the forwarding tunnel, and the base station can receive the data cached on the original service gateway through the forwarding tunnel. In addition, if the base station does not support the establishment of the forwarding tunnel, the target serving gateway serves as a data forwarding anchor serving gateway to acquire first data cached on the original serving gateway, and then transmits all the first data to the base station, and then transmits second data acquired from the packet data network gateway to the base station, so that the problem that the data received by the base station in the updating process of the tracking area is out of order can be solved.
Drawings
Fig. 1 is a schematic diagram of an evolved packet network system in the related art.
Fig. 2 is a signaling interaction diagram of data forwarding in a tracking area update procedure TAU in the related art.
Fig. 3 is a flowchart of an implementation method for forwarding data according to an embodiment of the present invention.
Fig. 4 is a flowchart of another implementation method for forwarding data according to an embodiment of the present invention.
Fig. 5 is a schematic structural diagram of an implementation apparatus for forwarding data according to an embodiment of the present invention.
Fig. 6 is a schematic structural diagram of another apparatus for implementing forwarding data according to an embodiment of the present invention.
Fig. 7 is a signaling interaction diagram for data forwarding in a first embodiment of the present invention.
Fig. 8 is a signaling interaction diagram of data forwarding in a second embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that the embodiments and features of the embodiments in the present application may be arbitrarily combined with each other without conflict.
As shown in fig. 3, an embodiment of the present invention provides a method for implementing data forwarding, where the method includes:
s10, in the course of updating the tracking area, the target mobile management unit sends a request message for requesting to establish a forwarding tunnel to the base station; the forwarding tunnel is used for forwarding the data cached on the original service gateway to the base station;
s20, the target mobile management unit sends the base station end information of the forwarding tunnel to the relevant network element to establish the forwarding tunnel after receiving the response message carrying the base station end information of the forwarding tunnel returned by the base station;
the method may further comprise the following features:
further, the destination mobility management unit sends a request message for requesting establishment of a forwarding tunnel to the base station, including:
the target mobile management unit sends an initial context establishment request message to the base station, wherein the initial context establishment request message carries indication information for requesting to establish a forwarding tunnel;
further, after receiving a response message carrying the base station side information of the forwarding tunnel returned by the base station, the destination mobile management unit sends the base station side information of the forwarding tunnel to a related network element to establish the forwarding tunnel, including:
and after receiving an initial context establishment response message carrying the base station end information of the forwarding tunnel, the target mobile management unit sends the base station end information of the forwarding tunnel to a related network element to establish the forwarding tunnel.
Further, sending the base station side information of the forwarding tunnel to a relevant network element to establish the forwarding tunnel, including:
sending the base station end information of the forwarding tunnel to an original mobile management unit, and then sending the base station end information of the forwarding tunnel to an original service gateway by the original mobile management unit so as to establish the forwarding tunnel between the base station and the original service gateway; or
Sending the base station side information of the forwarding tunnel to an anchor point service gateway for forwarding data to establish a forwarding tunnel between the anchor point service gateway and the base station, sending the anchor point service gateway side information of the forwarding tunnel to an original mobile management unit, and sending the anchor point service gateway side information of the forwarding tunnel to the original service gateway by the original mobile management unit to establish the forwarding tunnel between the anchor point service gateway and the original service gateway;
further, the base station side information of the forwarding tunnel includes: forwarding IP address information of a base station end of the tunnel and TEID information of a tunnel endpoint;
further, the anchor serving gateway side information of the forwarding tunnel includes: forwarding IP address information of an anchor point service gateway end of the tunnel and TEID information of a tunnel endpoint identifier;
further, the base station includes: evolved node b (enodeb); the mobility management unit includes: a mobility management entity MME;
in the 3G network system, the base station includes: UTRAN (UMTS Terrestrial Radio Access Network ); the mobility management unit includes: SGSN (Serving GPRS Support Node );
as shown in fig. 4, an embodiment of the present invention provides a method for implementing data forwarding, where the method includes:
s10, in the updating process of the tracking area, the target service gateway obtains the first data cached on the original service gateway;
s20, the target service gateway sends the first data cached on the original service gateway to the base station, and then sends the second data acquired from the packet data network gateway to the base station;
the method may further comprise the following features:
further, the obtaining, by the destination serving gateway, the first data cached in the original serving gateway includes:
the target service gateway receives first data sent by the original service gateway, and judges that all the first data cached on the original service gateway are completely received after the data end identifier is received;
further, after the destination serving gateway sends all the first data cached in the original serving gateway to the base station, the destination serving gateway sends second data acquired from the packet data network gateway to the base station, including:
and if the end of data identification is not detected in the first data cached on the original service gateway received by the target service gateway, judging that the first data is not received completely, and caching the second data from the packet data network gateway by the target service gateway.
Further, the end of data identifier is created by a packet data network gateway PGW or created by the original serving gateway;
further, the obtaining, by the destination serving gateway, the first data cached in the original serving gateway includes:
the target service gateway is used as a data forwarding anchor point service gateway to obtain first data from the original service gateway;
after the target mobile management unit learns that the base station does not support the establishment of the forwarding tunnel, the target service gateway is selected as a data forwarding anchor point service gateway; the forwarding tunnel is used for forwarding the data cached on the original service gateway to the base station;
preferably, the learning, by the destination mobility management unit, that the base station does not support establishing the forwarding tunnel includes:
the target mobile management unit sends an initial context establishment request message to the base station, wherein the initial context establishment request message carries indication information for requesting to establish a forwarding tunnel;
after receiving an initial context establishment response message returned by a base station, a target mobile management unit learns that the base station does not support establishment of a forwarding tunnel if the initial context establishment response message does not contain base station side information of the forwarding tunnel;
further, the destination mobility management unit may also know, through the local configuration information, that the base station does not support establishing the forwarding tunnel.
Further, the base station side information of the forwarding tunnel includes: forwarding the base station end IP address information and the tunnel endpoint identification TEID information of the tunnel.
Further, the base station includes: evolved node b (enodeb); the mobility management unit includes: a mobility management entity MME;
in the 3G network system, the base station includes: UTRAN (UMTS Terrestrial Radio Access Network ); the mobility management unit includes: SGSN (Serving GPRS Support Node );
as shown in fig. 5, an apparatus for implementing forwarding data provided in an embodiment of the present invention is applied to a mobility management unit, and includes:
a request module, which is used for serving as a target mobile management unit to send a request message for requesting to establish a forwarding tunnel to a base station in the process of updating the tracking area; the forwarding tunnel is used for forwarding the data cached on the original service gateway to the base station;
and the response receiving and processing module is used as a target mobile management unit for sending the base station end information of the forwarding tunnel to a related network element to establish the forwarding tunnel after receiving a response message which is returned by the base station and carries the base station end information of the forwarding tunnel.
The apparatus may also include the following features:
further, the request module is configured to send, as the destination mobility management unit, a request message for requesting establishment of a forwarding tunnel to the base station, and includes:
and the target mobile management unit sends an initial context establishment request message to the base station, wherein the initial context establishment request message carries indication information for requesting to establish a forwarding tunnel.
Further, the response receiving and processing module is configured to send, as the destination mobile management unit, the base station side information of the forwarding tunnel to the relevant network element to establish the forwarding tunnel after receiving a response message carrying the base station side information of the forwarding tunnel returned by the base station, and includes:
and after receiving an initial context establishment response message which is returned by the base station and carries the base station end information of the forwarding tunnel, the target mobile management unit sends the base station end information of the forwarding tunnel to a related network element to establish the forwarding tunnel.
Further, the response receiving and processing module is configured to send the base station side information of the forwarding tunnel to a relevant network element to establish the forwarding tunnel, and includes:
sending the base station end information of the forwarding tunnel to an original mobile management unit, and then sending the base station end information of the forwarding tunnel to an original service gateway by the original mobile management unit so as to establish the forwarding tunnel between the base station and the original service gateway; or
Sending the base station side information of the forwarding tunnel to an anchor point service gateway for forwarding data to establish a forwarding tunnel between the anchor point service gateway and the base station, sending the anchor point service gateway side information of the forwarding tunnel to an original mobile management unit, and sending the anchor point service gateway side information of the forwarding tunnel to the original service gateway by the original mobile management unit to establish the forwarding tunnel between the anchor point service gateway and the original service gateway;
further, the base station side information of the forwarding tunnel includes: forwarding IP address information of a base station end of the tunnel and TEID information of a tunnel endpoint;
further, the anchor serving gateway side information of the forwarding tunnel includes: forwarding IP address information of an anchor point service gateway end of the tunnel and TEID information of a tunnel endpoint identifier;
further, the base station includes: an evolved node B; the mobility management unit includes: a mobility management entity MME;
in the 3G network system, the base station includes: UTRAN (UMTS Terrestrial Radio Access Network ); the mobility management unit includes: SGSN (Serving GPRS Support Node );
as shown in fig. 6, an embodiment of the present invention provides an apparatus for implementing data forwarding, which is applied to a service gateway, and includes:
the data receiving module is used for serving as a target service gateway to acquire first data cached on an original service gateway in the updating process of the tracking area;
and the data sending module is used as a target service gateway to send all the first data cached on the original service gateway to the base station, and then send the second data acquired from the packet data network gateway to the base station.
The apparatus may also include the following features:
further, the data receiving module is configured to obtain, as the destination serving gateway, the first data cached in the original serving gateway, and includes:
and the target service gateway receives the first data sent by the original service gateway, and judges that all the first data cached on the original service gateway are received after the data end identifier is received.
Further, the data sending module is configured to send, as the destination serving gateway, all the first data cached in the original serving gateway to the base station, and then send, to the base station, second data acquired from the packet data network gateway, and includes:
and if the end of data identification is not detected in the first data cached on the original service gateway received by the target service gateway, judging that the first data is not received completely, and caching the second data from the packet data network gateway by the target service gateway.
Further, the end of data identifier is created by a packet data network gateway or by the original serving gateway.
Further, the data receiving module is configured to obtain, as the destination serving gateway, the first data cached in the original serving gateway, and includes:
the target service gateway is used as a data forwarding anchor point service gateway to obtain first data from the original service gateway;
after the target mobile management unit learns that the base station does not support the establishment of the forwarding tunnel, the target service gateway is selected as a data forwarding anchor point service gateway; the forwarding tunnel is used for forwarding the data cached on the original service gateway to the base station.
Further, the target mobility management unit learns that the base station does not support establishing the forwarding tunnel, and the method includes:
the target mobile management unit sends an initial context establishment request message to the base station, wherein the initial context establishment request message carries indication information for requesting to establish a forwarding tunnel;
after receiving an initial context establishment response message returned by a base station, the destination mobility management unit learns that the base station does not support establishment of a forwarding tunnel if the initial context establishment response message does not contain base station side information of the forwarding tunnel.
Further, the base station includes: an evolved node B;
the mobility management unit includes: a mobility management entity MME.
In the 3G network system, the base station includes: UTRAN (UMTS Terrestrial Radio Access Network ); the mobility management unit includes: SGSN (Serving GPRS Support Node );
DETAILED DESCRIPTION OF EMBODIMENT (S) OF INVENTION
Example 1
An embodiment of the present invention (in this embodiment, an eNodeB supports establishment of a forwarding tunnel) provides a method for implementing forwarding data, as shown in fig. 7, the method includes the following steps:
step S701, UE sends a TAU request message to eNodeB, wherein the message includes a Globally Unique Temporary Identity (GUTI) of a user;
step S702, eNodeB selects MME and forwards TAU request message to newly selected target MME;
step S703, the target MME acquires the original MME corresponding to the UE according to the GUTI carried in the TAU request, and sends a context request message to the original MME, wherein the original GUTI acquired in step S702 is carried in the context request message;
step S704, the original MME returns a context response message to the target MME, and the message carries the Mobility Management (MM) context and the bearer context of the UE; if downlink data are cached in the SGW, the original MME needs to indicate the data cache to be transmitted in the context response message;
step S705, the destination MME reselects a new SGW, and sends a session establishment request message to the destination SGW, where the message carries a control plane ip (internet protocol) address and a Tunnel Endpoint Identifier (TEID) of the destination MME, an International user identifier (IMSI) of the UE, and bearer context information of the UE;
step S706, the target SGW sends a bearer updating request message to the PGW, wherein the message carries the control plane IP address and TEID of the target SGW, and the user plane IP address and TEID of the S5 downlink SGW;
step S707, the PGW returns an update bearer response message to the destination SGW; the PGW sends an End of data marker (End marker) to the original SGW;
step S708, the target SGW returns a session establishment response message to the target MME, wherein the message carries the IP address and TEID of the control plane of the target SGW, and the IP address and TEID of the user plane of the uplink SGW of the S1-U interface;
step S709, the target MME returns a TAU accept message to the UE, where the message carries the re-allocated GUTI and Tracking Area Identity (TAI) list, and after receiving the new GUTI, the UE needs to return a TAU complete message to the target MME;
step S710, the target MME sends a request message for establishing context to the eNodeB, and the message carries the user plane IP address and TEID of the uplink SGW of the S1-U interface; the message also carries a request for establishing a forwarding tunnel;
step S711, the eNodeB sends a context establishing response message to the MME, wherein the message carries the user plane IP address and TEID of the downlink eNodeB of the S1-U interface; if the eNodeB supports the establishment of the forwarding tunnel in the TAU process, the eNodeB also returns the IP address and TEID of the eNodeB of the forwarding tunnel in a response message;
step S712, the destination MME sends an update bearer request message to the destination SGW, where the message carries the user plane IP address and TEID of the S1-U interface downlink eNodeB obtained in step S711; the SGW may also be notified in this bearer update request message, and the eNodeB supports establishment of a forwarding tunnel in the TAU procedure;
step S713, the target SGW returns a response message of updating the load to the target MME;
step S714, the target MME selects a forwarding anchor SGW, and sends a request message for establishing a forwarding tunnel to the forwarding anchor SGW, wherein the message carries IMSI, and the IP address and TEID of the eNodeB of the forwarding tunnel acquired in step S711;
the forwarding anchor point SGW may be a different SGW from the destination SGW, or may be the same SGW as the destination SGW; in fig. 7, the forwarding anchor SGW is the same SGW as the destination SGW;
step S715, the forwarding anchor SGW returns a response message for establishing the forwarding tunnel to the target MME, wherein the message carries the forwarding IP address and TEID of the anchor SGW;
step S716, the target MME returns a context confirmation message to the original MME, and the context confirmation message carries the forwarding IP address and TEID of the anchor SGW acquired in the step S715; if step S714, S715 are not executed, the context acknowledgement message returned by the destination MME to the original MME carries the IP address and TEID of the eNodeB forwarding the tunnel acquired in step S711;
step S717, the old MME sends a bearer update request message to the old SGW, where the message carries the IP address and TEID of the forwarding tunnel obtained in step S716;
step S718, the original SGW returns a bearer update response message to the MME,
step S719, the original MME sends a session release request message to the original SGW; the original SGW releases all information of the UE;
step S720, the original SGW sends a release session response message to the original MME.
In this way, the downlink data buffered in the original SGW may be forwarded through the path original SGW- > eNodeB (shown by a solid and thick line in the figure), or may be forwarded through the path original SGW- > forwarding anchor point SGW- > eNodeB (shown by a dotted and thick line in the figure).
Further, after the data cached by the original SGW is completely forwarded, if the original SGW does not receive the End Marker sent by the PGW, the original SGW needs to add an End tag (End Marker) when the forwarding and transfer of the buffered data are finished, and the End Marker can help the eNodeB to rearrange the data.
Example 2
An embodiment of the present invention (in this embodiment, an eNodeB does not support establishment of a forwarding tunnel) provides a method for implementing forwarding data, as shown in fig. 8, the method includes the following steps:
step S801, the UE sends a TAU request message to the eNodeB, where the message includes a Globally Unique Temporary Identity (GUTI for short) of the user;
step S802, the eNodeB selects an MME and forwards the TAU request message to a newly selected target MME;
step S803, the target MME acquires the original MME corresponding to the UE according to the GUTI carried in the TAU request, and sends a context request message to the original MME, wherein the context request message carries the original GUTI acquired in the step S802;
step S804, the original MME returns a context response message to the target MME, and the message carries the Mobility Management (MM) context and the bearing context of the UE; if downlink data are cached in the SGW, the original MME needs to indicate the data cache to be transmitted in the context response message;
step S805, the destination MME reselects a new SGW, and sends a session establishment request message to the destination SGW, where the message carries a control plane ip (internet protocol) address and a Tunnel Endpoint Identifier (TEID) of the destination MME, an International user identifier (IMSI) of the UE, and bearer context information of the UE;
step S806, the target SGW sends a bearer updating request message to the PGW, wherein the message carries the control plane IP address and TEID of the SGW, and the S5 interface downlink user plane IP address and TEID of the SGW;
step S807, the PGW returns an update bearer response message to the destination SGW; the PGW sends an End of data marker (End marker) to the original SGW;
step S808, the destination SGW returns a session establishment response message to the destination MME, wherein the message carries the IP address and TEID of the control plane of the SGW, and the IP address and TEID of the user plane of the uplink SGW of the S1-U interface;
step S809, the target MME returns a TAU accept message to the UE, where the message carries the re-allocated GUTI and Tracking Area Identity (TAI) list, and after receiving the new GUTI, the UE needs to return a TAU complete message to the MME;
step S810, the target MME sends a request message for establishing context to the eNodeB, and the message carries the user plane IP address and TEID of the uplink SGW of the S1-U interface; the message also carries a request for establishing a forwarding tunnel;
step S811, the eNodeB sends a context establishing response message to the MME, and because the eNodeB does not support the establishment of a forwarding tunnel in the TAU process, the message carries the user plane IP address and TEID of the S1-U interface downlink eNodeB;
step S812, the target MME sends a bearer updating request message to the target SGW, wherein the message carries the user plane IP address and TEID of the S1-U interface downlink eNodeB acquired in the step S811; the SGW may also be notified in this bearer update request message, and the eNodeB does not support the establishment of the forwarding tunnel in the TAU procedure;
step S813, the destination SGW returns an update bearer response message to the destination MME;
step S814, because the eNodeB does not support the establishment of the forwarding tunnel in the TAU process, the destination MME selects the destination SGW as the forwarding anchor SGW, and sends a request message for establishing the forwarding tunnel to the forwarding anchor SGW, wherein the message carries IMSI, and the user plane IP address and TEID of the S1-U interface downlink eNodeB acquired in step S811; the SGW may also know, in a local configuration manner, that the eNodeB does not support establishing the forwarding tunnel in the TAU procedure.
Step S815, the forwarding anchor SGW returns a response message for establishing a forwarding tunnel to the target MME, wherein the message carries the forwarding IP address and TEID of the forwarding anchor SGW;
step S816, the target MME returns a context confirmation message to the original MME, and the message carries the forwarding IP address and TEID of the forwarding anchor SGW acquired in the step S815;
step S817, the original MME sends a bearer update request message to the original SGW, and the message carries the forwarding IP address and TEID of the forwarding anchor SGW obtained in step S816;
step S818, the original SGW returns a bearer update response message to the MME,
step S819, the original MME sends a session release request message to the original SGW; the original SGW releases all information of the UE;
step S820, the original SGW sends a release session response message to the original MME.
In this way, the downlink data buffered in the original SGW is forwarded through the path original SGW- > forwarding anchor SGW (the forwarding anchor SGW is the destination SGW) - > eNodeB (shown by a solid and thick line in the figure).
Further, after the data cached by the original SGW is completely forwarded, if the original SGW does not receive an End Marker sent by the PGW, the original SGW needs to add an End tag (End Marker) when forwarding and transmitting of the buffered data are finished, and when the eNodeB does not support forwarding of data in the tracking area updating process, the target SGW considers that no data needs to be received on the forwarding tunnel after receiving the End Marker, and discards the End Marker; the eNodeB does not support forwarding data in the tracking area update process, and then the destination SGW needs to transmit all data on the forwarding tunnel to the eNodeB, and then send the data received from the PGW to the eNodeB. If the data from the PGW is received before all the cached data of the original SGW is forwarded to the eNodeB through the forwarding tunnel, the destination serving gateway first caches the data from the PGW.
In the method and apparatus for implementing forwarding data provided in the foregoing embodiment, in the tracking area update process, the destination mobile management unit sends a request message for requesting establishment of a forwarding tunnel to the base station, and after receiving a response message carrying base station side information of the forwarding tunnel returned by the base station, sends the base station side information of the forwarding tunnel to a related network element to establish the forwarding tunnel, and the base station can receive data cached in an original service gateway through the forwarding tunnel. In addition, if the base station does not support the establishment of the forwarding tunnel, the target serving gateway serves as a data forwarding anchor serving gateway to acquire first data cached on the original serving gateway, and then transmits all the first data to the base station, and then transmits second data acquired from the packet data network gateway to the base station, so that the problem that the data received by the base station in the updating process of the tracking area is out of order can be solved.
It will be understood by those skilled in the art that all or part of the steps of the above methods may be implemented by instructing the relevant hardware through a program, and the program may be stored in a computer readable storage medium, such as a read-only memory, a magnetic or optical disk, and the like. Alternatively, all or part of the steps of the foregoing embodiments may also be implemented by using one or more integrated circuits, and accordingly, each module/unit in the foregoing embodiments may be implemented in the form of hardware, and may also be implemented in the form of a software functional module. The present invention is not limited to any specific form of combination of hardware and software.
It should be noted that the present invention can be embodied in other specific forms, and various changes and modifications can be made by those skilled in the art without departing from the spirit and scope of the invention.

Claims (12)

1. A method for implementing data forwarding includes:
in the updating process of the tracking area, a target mobile management unit sends a request message for requesting to establish a forwarding tunnel to a base station; the forwarding tunnel is used for forwarding the data cached on the original service gateway to the base station;
and after receiving a response message which is returned by the base station and carries the base station end information of the forwarding tunnel, the target mobile management unit sends the base station end information of the forwarding tunnel to a related network element to establish the forwarding tunnel.
2. The method of claim 1, wherein:
the destination mobile management unit sends a request message for requesting to establish a forwarding tunnel to the base station, and the request message comprises the following steps:
the target mobile management unit sends an initial context establishment request message to the base station, wherein the initial context establishment request message carries indication information for requesting to establish a forwarding tunnel.
3. The method of claim 2, wherein:
after receiving a response message carrying base station end information of a forwarding tunnel returned by a base station, a destination mobile management unit sends the base station end information of the forwarding tunnel to a related network element to establish the forwarding tunnel, and the method comprises the following steps:
and after receiving an initial context establishment response message which is returned by the base station and carries the base station end information of the forwarding tunnel, the target mobile management unit sends the base station end information of the forwarding tunnel to a related network element to establish the forwarding tunnel.
4. The method of claim 3, wherein:
sending the base station side information of the forwarding tunnel to a relevant network element to establish the forwarding tunnel, including:
sending the base station end information of the forwarding tunnel to an original mobile management unit, and then sending the base station end information of the forwarding tunnel to an original service gateway by the original mobile management unit so as to establish the forwarding tunnel between the base station and the original service gateway; or
And sending the base station side information of the forwarding tunnel to an anchor point service gateway for forwarding data to establish a forwarding tunnel between the anchor point service gateway and the base station, sending the anchor point service gateway side information of the forwarding tunnel to an original mobile management unit, and sending the anchor point service gateway side information of the forwarding tunnel to the original service gateway by the original mobile management unit to establish the forwarding tunnel between the anchor point service gateway and the original service gateway.
5. The implementation method according to any of claims 1 to 4, characterized in that:
the base station side information of the forwarding tunnel comprises: forwarding the base station end IP address information and the tunnel endpoint identification TEID information of the tunnel.
6. The implementation method according to any of claims 1 to 4, characterized in that:
the base station includes: an evolved node B;
the mobility management unit includes: a mobility management entity MME.
7. An implementation device for forwarding data, applied to a mobile management unit, includes:
a request module, which is used for serving as a target mobile management unit to send a request message for requesting to establish a forwarding tunnel to a base station in the process of updating the tracking area; the forwarding tunnel is used for forwarding the data cached on the original service gateway to the base station;
and the response receiving and processing module is used as a target mobile management unit for sending the base station end information of the forwarding tunnel to a related network element to establish the forwarding tunnel after receiving a response message which is returned by the base station and carries the base station end information of the forwarding tunnel.
8. The implementation apparatus of claim 7, wherein:
a request module, configured to send a request message for requesting to establish a forwarding tunnel to a base station as a destination mobility management unit, including:
and the target mobile management unit sends an initial context establishment request message to the base station, wherein the initial context establishment request message carries indication information for requesting to establish a forwarding tunnel.
9. The implementation apparatus of claim 8, wherein:
the response receiving and processing module is configured to, as a target mobile management unit, send base station side information of a forwarding tunnel to a related network element to establish the forwarding tunnel after receiving a response message carrying the base station side information of the forwarding tunnel returned by a base station, and includes:
and after receiving an initial context establishment response message which is returned by the base station and carries the base station end information of the forwarding tunnel, the target mobile management unit sends the base station end information of the forwarding tunnel to a related network element to establish the forwarding tunnel.
10. The implementation apparatus of claim 9, wherein:
the response receiving and processing module is configured to send the base station side information of the forwarding tunnel to a relevant network element to establish the forwarding tunnel, and includes:
sending the base station end information of the forwarding tunnel to an original mobile management unit, and then sending the base station end information of the forwarding tunnel to an original service gateway by the original mobile management unit so as to establish the forwarding tunnel between the base station and the original service gateway; or
And sending the base station side information of the forwarding tunnel to an anchor point service gateway for forwarding data to establish a forwarding tunnel between the anchor point service gateway and the base station, sending the anchor point service gateway side information of the forwarding tunnel to an original mobile management unit, and sending the anchor point service gateway side information of the forwarding tunnel to the original service gateway by the original mobile management unit to establish the forwarding tunnel between the anchor point service gateway and the original service gateway.
11. The implementation device of any one of claims 7-10, wherein:
the base station side information of the forwarding tunnel comprises: forwarding the base station end IP address information and the tunnel endpoint identification TEID information of the tunnel.
12. The implementation device of any one of claims 7-10, wherein:
the base station includes: an evolved node B;
the mobility management unit includes: a mobility management entity MME.
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