KR20180097497A - Method for Transmitting Downlink Packet Data in Core Network with Separation of User Plane and Control Plane - Google Patents

Abstract

Disclosed is a method for transmitting a downlink packet in a function-separated core network. According to an embodiment of the present invention, provided is the method for transmitting a downlink packet for a terminal device of an idle mode to reduce a data transmission delay time for a user and efficiently use a network resource, in a mobile communication system where a user plane and a control plane of a gateway node are separated from each other. The method for transmitting a downlink packet includes the steps of: changing a routing path of the downlink packet; receiving and buffering the downlink packet and transmitting a reception notification message of the downlink packet by a first user plane node; transmitting the buffered downlink packet to a second user plane node; and transmitting the buffered downlink packet to the terminal device by the second user plane node.

Description

Technical Field [0001] The present invention relates to a method for transmitting a downlink packet in a separated core network,

The present embodiment relates to a method for transmitting a downlink packet to a terminal apparatus in an idle mode in a mobile communication system in which a control plane and a user plane of a gateway node are separated.

The contents described in this section merely provide background information on the present embodiment and do not constitute the prior art.

As demand for multimedia services grows, discussions about 5G mobile communication technology are underway to service large capacity traffic. In the 5th generation mobile communication system, it is an important task to efficiently process large amount of traffic. In response to such a problem, discussion on separating the function of the control plane (CP) of the gateway from the function of the user plane (UP) has been conducted by the 3GPP (3 ^rd Generation Partnership Project) .

When a gateway separately exists as a node performing a function of a control plane and a node performing a function of a user plane and when a downlink traffic is generated for a user equipment (UE) in an idle mode, A processing method different from the conventional one is needed. In other words, there is a need for a method capable of efficiently processing nodes (gateway user plane nodes) where traffic arrives and nodes (gateway control plane nodes) that need to process paging are different from each other.

Also, in the fifth generation mobile communication system, the downlink traffic generated to the idle mode terminal device will frequently occur or the traffic having a large capacity will be efficiently processed, thereby reducing the data transmission delay time for the user, Is an important issue.

In embodiments of the present invention, in a mobile communication system in which a control plane of a gateway node and a user plane are separated, a data transmission delay time for a user is reduced, and a downlink packet And a method for transmitting the data.

According to the embodiment of the present invention, in a mobile communication system in which a gateway is divided into a user plane node (hereinafter referred to as 'GW UP') and a control plane node (hereinafter referred to as 'GW CP'), The GW CP transmits a first forwarding table update command message to the first user plane node and the second user plane node as the terminal apparatus is switched to the idle mode, Changing a routing path of the downlink packet, receiving the downlink packet by the first user plane node, buffering the downlink packet, and transmitting a reception notification message of the downlink packet to the GW CP, The GW CP sends a second forwarding table update command message to the second user plane node and the first user plane node Transmitting the buffered downlink packet to the second user plane node, and transmitting the buffered downlink packet to the terminal apparatus through the base station apparatus, Wherein the user plane node is separated into the first user plane node and the second user plane node, the first user plane node supporting the idle mode of the terminal device, and the second user plane node connecting to the connection Mode is supported in the downlink packet transmission method.

According to the embodiment of the present invention, in a mobile communication system in which a gateway is divided into a user plane node (hereinafter referred to as 'GW UP') and a control plane node (hereinafter referred to as 'GW CP'), The GW CP transmits a first forwarding table update command message to the first user plane node and the second user plane node as the terminal apparatus is switched to the idle mode, Transmitting the downlink packet to the first user plane node by the second user plane node in response to the first forwarding table update command message, and transmitting the downlink packet to the first user plane node, Buffering the GW CP and transmitting a reception notification message of the downlink packet to the GW CP, The CP sending a second forwarding table update command message to the second user plane node and the first user plane node to forward the buffered downlink packet to the second user plane node, Wherein the user plane node is separated into the first user plane node and the second user plane node and the first user plane node is separated into the first user plane node and the second user plane node, The plane node supports the idle mode of the terminal device, and the second user plane node supports the connection mode of the terminal device.

According to the embodiment of the present invention, in a mobile communication system in which a gateway is divided into a user plane node (hereinafter referred to as 'GW UP') and a control plane node (hereinafter referred to as 'GW CP'), The user plane node transmitting the downlink packet receives the first forwarding table update command message from the GW CP according to the transition of the terminal apparatus to the idle mode and receives and buffers the downlink packet A first user plane for transmitting the reception notification message of the downlink packet to the GW CP, receiving a second forwarding table update command message from the GW CP, and transmitting the buffered downlink packet to a second user plane node, And a first forwarding table update command message from the GW CP according to the transition of the terminal apparatus to the idle mode, And a second user plane node that receives the second forwarding table update command message from the second user plane node and receives the buffered downlink packet from the first user plane node.

According to the embodiment of the present invention, in a mobile communication system in which a gateway is divided into a user plane node (hereinafter referred to as 'GW UP') and a control plane node (hereinafter referred to as 'GW CP'), The user plane node that transmits the downlink packet receives the first forwarding table update command message from the GW CP according to the transition of the terminal apparatus to the idle mode and receives the first forwarding table update command message Receives the downlink packet from the second user plane node, buffers the downlink packet, transmits a reception notification message of the downlink packet to the GW CP, and transmits the reception notification message of the downlink packet in response to the reception notification message of the downlink packet Receiving a second forwarding table update command message from the GW CP, and forwarding the buffered downlink packet to the second user plane node A first user plane node receiving a first forwarding table update command message from the GW CP as the terminal apparatus is switched to the idle mode and receiving a first forwarding table update command message from the GW CP according to the first forwarding table update command message, Link packet to the first user plane node, receives the second forwarding table update command message from the GW CP, receives the buffered downlink packet and transmits the buffered downlink packet to the second user plane node .

As described above, according to the embodiments of the present invention, in a mobile communication system in which a control plane of a gateway node and a user plane are separated, in order to reduce a data transmission delay time for a user and efficiently use network resources, There is an effect of providing a method of transmitting downlink data to a terminal apparatus.

According to the embodiment of the present invention, in the mobile communication system in which the user plane of the gateway node and the control plane are separated, the idle mode of the terminal device is supported and the battery usage time can be increased.

According to an embodiment of the present invention, by separating a gateway user plane node that processes traffic generated in a connection mode of a terminal device and a gateway user plane node that buffers downlink traffic generated in an idle mode of the terminal device, Or to reduce the complexity of the gateway user plane node.

According to an embodiment of the present invention, a gateway user plane node that processes traffic generated in a connection mode of a terminal device and a gateway user plane node that buffers downlink traffic generated in an idle mode of the terminal device are configured as service chaining The overhead due to the routing path update can be reduced.

1 is a configuration diagram of a conventional LTE mobile communication system.
2 is a configuration diagram of a mobile communication system according to an embodiment of the present invention.
3 is a flowchart illustrating a downlink data transmission method for an idle mode terminal according to an embodiment of the present invention.
4 is a flowchart illustrating a downlink data transmission method for an idle mode terminal according to another embodiment of the present invention.
5 is a flowchart illustrating a downlink data transmission method for an idle mode terminal according to another embodiment of the present invention.

Hereinafter, some embodiments of the present invention will be described in detail with reference to exemplary drawings.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The following detailed description, together with the accompanying drawings, is intended to illustrate exemplary embodiments of the invention and is not intended to represent the only embodiments in which the invention may be practiced.

1 is a configuration diagram of a conventional LTE mobile communication system.

1, a conventional LTE mobile communication system includes a user equipment (UE) 10, a base station (RAN) 20, a mobility management entity (MME) 30, (Hereinafter referred to as 'S-GW') 40, a packet data network gateway (P-GW) 60, a policy and charging rule function (PCRF) 50, and a Packet Data Network (PDN) 70.

The conventional LTE mobile communication system can be broadly divided into a terminal device 10, a base station device 20, and a core network. Here, the core network includes the MME 30, the S-GW 40, the P-GW 60, and the PCRF 50.

The gateways (S-GW and P-GW) included in the core network function to link the PDN 70 and the base station apparatus 20 together. The functions of the gateway can be broadly divided into a function of a user plane (UP) for transmitting a user data packet and a function of a control plane (CP) for controlling a function of a user plane.

The function of the control plane is to finally decide the traffic transmission parameters to be used in the user plane in consideration of the user service and the network state such as session management, mobility management, QoS (quality of service) management, to be. On the other hand, the function of the user plane is to process (e.g., transmit, discard, buffer, etc.) an actual user traffic packet by applying parameters determined by the control plane.

Most of the conventional gateway nodes (S-GW and P-GW) have both the functions of the user plane and the control plane together.

However, in the mobile communication system according to the embodiment of the present invention, the control plane and the user plane of the gateway are separately located. As described above, the function performed in the user plane is simple and repetitive in comparison with the function performed in the control plane, since the user traffic packet is processed according to the determined parameter. Therefore, in this embodiment, the user plane is implemented with a switch having a low complexity and a low price, and the control plane is centralized, thereby improving the performance of the entire mobile communication system. That is, it is possible to improve the entire system by implementing the system by separating it according to the performance required by the functions of the user plane and the control plane. In addition, there is also an effect of improving the system performance and increasing the price efficiency.

Hereinafter, a structure of a mobile communication system according to an embodiment of the present invention will be described in detail with reference to FIG.

2 is a configuration diagram of a mobile communication system according to an embodiment of the present invention.

A mobile communication system 100 according to an embodiment of the present invention includes a terminal device 110, a base station device 120, an MME 132, a gateway control plane node 134 (hereinafter, referred to as 'GW CP' A node 142 (hereinafter, referred to as 'GW UP'), and a PCRF 136.

Here, the terminal device 110 can access the external network (not shown) through the base station device 120, the central cloud 130, and the edge cloud 140. The terminal device 110 may be, for example, a tablet PC, a laptop, a personal computer (PC), a portable multimedia player (PMP), a wireless communication terminal ), A smartphone (SmartPhone), and a mobile communication terminal (Mobile Communication Terminal).

The base station apparatus 120 is a radio access network (RAN) node, which constitutes an access network for call processing of the terminal apparatus 110. The base station apparatus 120 may be, for example, an e-NodeB.

The MME 132 includes a signaling and control function for supporting access to the network connection, network resource allocation, tracking, paging, roaming, and handover of the terminal device 110 Lt; / RTI >

The GW CP 134 refers to a node that performs a control plane function of the gateway, and the GW UP 142 refers to a node that performs a user plane function of the gateway. GW UP 142 may include GW UP-C 144 and GW UP-I 146 in accordance with an embodiment of the present invention. The GW UP-C 144 and the GW UP-I 146 are nodes that share the functions of the GW UP 142 according to the idle mode and the connected mode of the terminal device 110, A detailed description thereof will be given later with reference to other drawings.

The PCRF 136 is a node for defining policies and charging rules for each terminal device 110.

The MME 132, the GW CP 134 and the PCRF 136 may be virtualized and executed in the central cloud 130 and the GW UP 142 may be virtualized and executed in the edge cloud 140. The central cloud 130 and the edge cloud 140 may be implemented as commercial servers. The edge cloud 140 is a cloud providing communication and computing functions located at the edge of a provider network, i.e., near a user terminal device or a base station device.

According to an embodiment of the present invention, the function of the gateway can be separated and the user plane node GW UP can be advancedly placed in the edge cloud 140. The transmission delay of the user data can be effectively shortened as the physical paths of the terminal device 110 and the base station device 120 become short with the forward placement of the user plane node GW UP.

However, due to the system structure in which the user plane and the control plane are separated from each other, it is difficult to process the downlink traffic of the terminal device 110 in the idle state. Specifically, downlink traffic arrives at a user plane node, but it detects paging and triggers a service request process, more specifically, transmits a Downlink Data Notification message to the MME This is done at the control plane node.

Another problem is to include a function of storing (buffering) a packet in a user plane node in order to process a downlink packet of the terminal device 110 in an idle state. When a buffering function is implemented in all user plane nodes, It is difficult to process a packet that should be transmitted to a terminal device in a connected state in order to perform a fast packet forwarding operation, thereby degrading service formability or making it difficult to implement a user plane node with a switch having a low complexity.

In order to solve such a problem, embodiments of the present invention provide a method for processing downlink traffic to an idle terminal device 110 by exchanging information between a user plane node and a control plane node.

Hereinafter, embodiments of the present invention will be described in detail with reference to Figs. 3 to 5. Fig.

3 is a flowchart illustrating a downlink data transmission method for an idle mode terminal according to an embodiment of the present invention.

Referring to FIG. 3, the terminal device 110 switches to the idle mode after terminating the data transmission in the connection mode (S310). Accordingly, the GW CP 134 registers information for receiving a downlink packet to the terminal device 110 and a reception notification event in the GW UP 142 (S312). The step S312 of registering the information for reception of the downlink packet and the reception notification event may be performed when the GW CP 134 includes at least one of International Mobile Subscriber Identification (IMSI) and IP address of the terminal apparatus 110 And transmitting the information to the GW UP.

When the GW UP 142 and the GW CP 134 communicate using the OpenFlow protocol according to the embodiment of the present invention, the information that the GW CP 134 transmits to the GW UP 142 includes information that can identify a specific IP address And may further include filter information. In this case, the GW UP 134 includes at least one of reception information of a downlink packet matched with a filter, a terminal device to which the received downlink packet belongs, an IP address, and a tunnel endpoint identifier (TEID) To the GW CP 134. The GW CP 134,

According to the embodiment of the present invention, the GW CP 134 may transmit the first forwarding table update command message including GW UP including the predetermined buffering time. Here, the predetermined buffering time may be set based on, for example, the subscription information or the service characteristic of the user. In this case, the GW UP does not transmit the downlink packet reception notification message to the GW CP 134 until the predetermined buffering time expires even if the GW UP receives the downlink packet. This can reduce the battery consumption of the terminal device 110 using the service that is not sensitive to the delay.

After step S312, when a downlink packet destined for the identification information (IMSI) or the IP address of the terminal device 110 is received in the GW UP 142, the GW UP 142 buffers the received downlink packet S314) transmits a downlink packet reception event notification message to the GW CP 134 (S316). The generation notification message of the downlink packet reception event may include at least one of identification information (IMSI), IP address, and tunnel termination identification information (TEID) of the terminal apparatus.

The GW CP 134 transmits a reception notification message of a downlink packet informing that the downlink packet to the terminal device 110 in the idle mode has been received by the Mobility Management Entity (MME) S318). Here, the reception acknowledgment message of the downlink packet may include tunnel end information (TEID) of the EPS bearer to which the packet belongs.

When the GW CP 134 does not receive the tunnel termination identification information (TEID) from the GW UP 142, the packet data network connection (i. E.) Identified by at least one of the identification information (IMSI) (TEID) of a default bearer of a Packet Data Network Connection (PDN Connection). The GW CP 134 transmits a message informing the MME 132 that the downlink packet has been received by using the notification information received from the GW UP 142. [

After step S318, the MME 132 transmits a paging request message to the terminal device 110 via the base station device 120 and receives a service request message from the terminal device 110, A paging process (S320) and a bearer setup process (S322) are performed.

The GW UP 134 transmits the downlink packet buffered through the base station apparatus 120 to the terminal apparatus 110 (S324 and S326). Specifically, the GW UP 134 transmits the buffered downlink packet to the base station apparatus 120 using the bearer set in step S322, and the base station apparatus 120 transmits the received downlink packet to the terminal apparatus 110 (S326).

In FIG. 3, it is described that each process is sequentially executed, but it is not limited thereto. In other words, the present invention can be applied to changing the procedure shown in FIG. 3 or executing one or more processes in parallel. Therefore, FIG. 3 is not limited to the time series.

The embodiment shown in FIG. 3 has an effect that the downlink traffic to the terminal device 110 in the idle mode can be processed in the mobile communication network 100 in which the GW CP 134 and the GW UP 142 are separated .

The GW UP 142 according to the embodiment of the present invention can process the downlink traffic by performing the buffering function when the terminal device 110 is switched to the idle mode and the buffering function increases the complexity of the mobile communication system It can be a cause. This is because, when considering that the terminal connected to the network exists in the idle mode for most of the time, the amount of traffic to be buffered by the GW UP 142 is large or idle mode switching frequently occurs. In order to buffer a large amount of traffic, the GW UP 142 should be equipped with a large-capacity buffering function, which can increase the complexity of the user plane node. If the number of terminal devices is large or the idle mode entry of the terminal devices is frequent, the traffic processing of the connected mode terminal device may be delayed to process the traffic of the idle mode terminal devices. Accordingly, it is necessary to separate the functions of the GW UP 142 according to the connection mode or the idle mode of the terminal device 110 to control the complexity of the node or the connection mode traffic processing to be unaffected.

Hereinafter, embodiments of the present invention for solving the above-mentioned problems will be described with reference to FIG.

4 is a flowchart illustrating a downlink data transmission method for an idle mode terminal according to another embodiment of the present invention.

4, the mobile communication system 100 of the present embodiment includes a connection mode user plane node (hereinafter, referred to as 'GW UP-C') for processing traffic generated in the connection mode of the terminal device 110, (Hereinafter referred to as 'GW UP-I') that buffers traffic generated in the idle mode of the mobile terminal 110.

The present embodiment separates the GW UP 142 into GW UP-C 144 and GW UP-I 146 and concentrates the buffering function in the idle mode to the GW UP-I 146. This reduces the complexity of the GW UP-C 144 and reduces the impact on the connection mode traffic processing.

Referring to FIG. 4A, the terminal device 110 terminates the data transmission in the connection mode (S410). Accordingly, the base station apparatus 120 transmits a UE context release request message (e.g., UE Context Release Request) to the MME 132 (S412), and the MME 132 transmits a bearer modification / release request message to the GW CP 134 (E.g., Bearer Release Request) (S414). The steps S412 and S414 are merely examples for the process of switching the terminal device 110 to the idle mode and those skilled in the art will appreciate that various modifications may be made without departing from the essential characteristics of the embodiment And variations will be possible.

The GW CP 134 transmits a first forwarding table update command message to the GW UP-I 146 and the GW UP-C 144 as the terminal device 110 is switched to the idle mode ). Herein, the first forwarding table update command message is a message for instructing the GW UP-I 146 to update the forwarding table so that the GW UP-C 146 not the GW UP-C 144 receives downlink packets generated for the terminal apparatus 110 in the idle mode. . ≪ / RTI >

Specifically, the GW CP 134 sends a message to the GW UP-C 144 to instruct the GW UP-C 144 to update the forwarding table so that the GW UP-C 144 does not receive the downlink packet for the terminal device 110 in the idle mode. (S416). The GW CP 134 may also send a message to the GW UP-I 146 instructing the GW UP-I 146 to update the forwarding table to receive the downlink packet for the terminal device 110 in the idle mode (S418).

According to an embodiment of the present invention, the GW CP 134 may transmit the first forwarding table update command message to the GW UP-I 146 including a predetermined buffering time. Here, the predetermined buffering time may be set based on, for example, the subscription information or the service characteristic of the user. In this case, the GW UP-I 146 does not transmit the downlink packet reception notification message to the GW CP 134 until the preset buffering time expires even if the GW UP-I 146 receives the downlink packet. This can reduce the battery consumption of the terminal device 110 using the service that is not sensitive to the delay.

The GW UP-I 146 having received the first forwarding table update command message changes the transmission path of the downlink packet from the GW UP-C 144 to the GW UP-I 146 (S420). Specifically, the GW UP-I 146 may send routing information to the one or more routers 150 to modify the routing path as described above.

When the GW UP-I 146 receives the downlink packet for the terminal device 110 in the idle mode according to the changed routing path, the GW UP-I 146 transmits a reception notification message of the downlink packet informing it to the GW CP (Step S424). Here, the reception notification message of the downlink packet may include identification information (IMSI) of the terminal device 110, an IP address, and tunnel termination identification information (TEID). As described above, when the buffering time is received by the GW UP-I 146, transmission of the reception notification message of the downlink packet may be delayed until the buffering time expires.

Step S426 is similar to the paging process and the service request process described above with reference to FIG. 3, and thus description thereof will be omitted.

The GW CP 134 transmits a second forwarding table update command message to the GW UP-C 144 and the GW UP-I 146 in response to the reception notification message of the downlink packet (S428 and S430). Specifically, the GW CP-134 may transmit a message instructing the GW UP-C 144 to update the forwarding table so as to receive the downlink packet buffered in the GW UP-I 146 (S428). Also, the GW CP 134 may transmit a message instructing the GW UP-C 144 to update the forwarding table so as to forward the downlink packet buffered in the GW UP-I 146 to the GW UP-C 144 (S430). Here, the message for instructing the updating of the forwarding table may include the address or port information of the GW UP-C 144.

The GW UP-I 146 transmits the buffered downlink packet to the GW UP-C 144 using the path generated according to the forwarding table update (S432).

A process of resetting the bearer (e.g., the EPS bearer) may be performed in order to transmit the downlink packet from the GW UP-C 144 to the base station apparatus 120 (S434).

The GW UP-C 144 changes the transmission path of the downlink packet generated after the terminal device 110 is switched from the idle mode to the connection mode to the GW UP-C 146 from the GW UP-I 146 The routing information for changing the routing path may be transmitted to one or more routers 150 (S436).

The GW UP-C 144 transmits the downlink packet buffered in the GW UP-I 146 to the terminal device 110 through the base station device 120 (S438 and S440). Specifically, the GW UP-C 144 transmits the downlink packet to the base station apparatus 120 using the bearer set in step S434, and the base station apparatus 120 transmits the received downlink packet to the terminal apparatus 110 (S440).

In FIGS. 4A and 4B, it is described that each process is sequentially executed, but it is not limited thereto. 4A and 4B may be modified or executed in parallel or one or more processes may be executed in parallel. Thus, FIGS. 4A and 4B are not limited to time-series order.

Meanwhile, in the above-described embodiment, a packet buffered in the GW UP-I 146 is transferred to the GW UP-C 144 when the terminal device 110 in the idle mode is switched to the connection mode, C 144 transmits packets to the terminal device 110 via the base station device 120, but the present invention is not limited thereto. For example, when the GW UP-I 146 is directly connected to the base station apparatus 120, the GW CP 134 transmits packets buffered in the GW UP-I 146 to the base station apparatus 120, I 146 and the GW UP-C 144 by setting the forwarding information to change the packet transmission path to the GW UP-C 144.

The embodiment shown in FIG. 4 includes a gateway user node GW UP-C that processes traffic generated in the connection mode of the terminal device 110 and a gateway user node GW UP-I that buffers traffic generated in the idle mode. The efficiency of the system can be improved.

However, as the downlink packet transmission path is changed between the GW UP-C 144 and the GW UP-I 146, there is an overhead that routing path information must be transmitted to one or more routers 150. Therefore, a method for reducing such overhead is required.

Hereinafter, embodiments of the present invention for solving the above-mentioned problems will be described with reference to FIG.

5 is a flowchart illustrating a downlink data transmission method for an idle mode terminal according to another embodiment of the present invention.

Referring to FIG. 5A, the terminal device 110 terminates the data transmission in the connection mode (S510). Accordingly, the base station apparatus 120 transmits a UE context release request message (e.g., UE Context Release Request) to the MME 132 in step S512, and the MME 132 transmits a bearer modification / (E.g., Bearer Release Request) (S514). The steps S512 and S514 are merely examples for the process of converting the terminal device 110 into the idle mode and those skilled in the art will appreciate that various modifications may be made without departing from the essential characteristics of the embodiment And variations will be possible.

In this embodiment, the GW UP-C 144 and the GW UP-I 146 are connected by service chaining. The functions of the GW UP-C 144 and the GW UP-I 146 can be virtualized and connected. The application of the service chaining means that the downlink packet transmission is performed by the path of the GW UP-C 144 GW UP-I 146 GW UP-C 144 base station apparatus 120. On this path, the GW UP-I 146 receives and stores the idle mode traffic from the GW UP-C, and transfers the idle mode traffic to the GW UP-C when the terminal device 110 is switched to the connection mode .

The GW CP 134 transmits a first forwarding table update command message to the GW UP-I 146 and the GW UP-C 144 as the terminal device 110 switches to the idle mode. Here, the first forwarding table update command message is generated by the GW UP-C 144 receiving the downlink packet generated in the idle mode of the terminal device 110 and transmitting the downlink packet to the GW UP-I 146, May be a message instructing the forwarding table update to buffer the forwarded downlink packet.

That is, the GW CP 134 may transmit a message to the GW UP-C 144 instructing to update the forwarding table so that the downlink packet received by the GW UP-C 144 is forwarded to the GW UP-I 146 (S516). Also, the GW CP 134 may send a message to the GW UP-I 146 to buffer the downlink packet received from the GW UP-C 144 (S518).

The GW UP-C 144 may transmit the first forwarding table update command message including the predetermined buffering time to the GW UP-I 146 according to an embodiment of the present invention. Here, the predetermined buffering time may be set based on, for example, the subscription information or the service characteristic of the user. In this case, the GW UP-I 146 does not transmit the downlink packet reception notification message to the GW CP 134 until the preset buffering time expires even if the GW UP-I 146 receives the downlink packet. This can provide an effect of reducing battery consumption of the terminal device 110 using a service that is not delay-sensitive.

The downlink packet generated in the idle mode terminal device 110 is first transmitted to the GW UP-C 144 in step S520. The GW UP-C 144 transmits the received downlink packet to the established service chain To the GW UP-I 146 (S522).

The GW UP-I 146 buffers the received downlink packet (S522), and transmits a downlink reception notification message informing the GW CP 134 of the reception of the downlink packet (S526). If the above buffering time is set, the GW UP-I 146 may buffer the packet until the time expires, and may transmit a reception notification message to the GW CP 134 at the expiration time.

Step S528 is similar to the paging process and the service request process described above with reference to FIG. 3, and therefore, description thereof will be omitted.

Then, the GW CP 134 transmits a second forwarding table update command message to the GW UP-C 144 and the GW UP-I 146 in response to the reception notification message of the downlink packet (S530 and S532) And causes the downlink packet buffered in the UP-I 146 to be transmitted to the GW UP-C 144 (S534).

Specifically, the GW CP 134 may transmit a message instructing the GW UP-C 144 to update the forwarding table so as to receive the downlink packet buffered in the GW UP-I 146 (S530). In addition, a message for instructing a forwarding table update may be transmitted so that a downlink packet generated after the terminal device 110 is switched to the connection mode is not transmitted to the GW UP-I 146. This is for deactivating the service chain established when the terminal device 110 is in the idle mode.

In addition, the GW CP 134 may send a message to the GW UP-I 146 instructing the GW UP-C 144 to update the forwarding table to forward the downlink packet buffered in the GW UP-I 146 to the GW UP- (S532). Here, the command message (the second forwarding table update command message) transmitted by the GW CP 134 may include the address or port information of the GW UP-C 144.

The GW UP-I 146 transfers the buffered downlink packet to the GW UP-C 144 at step S534 and the GW UP-C 144 transmits the buffered downlink packet to the GW UP-I 146 via the base station apparatus 120. [ To the terminal device 110 (S536 and S538). A detailed description thereof is similar to that described above with reference to FIG. 4B, and a description thereof will be omitted.

Meanwhile, in the above-described embodiment, a packet buffered in the GW UP-I 146 is transferred to the GW UP-C 144 when the terminal device 110 in the idle mode is switched to the connection mode, C 144 transmits packets to the terminal device 110 via the base station device 120, but the present invention is not limited thereto. For example, when the GW UP-I 146 is directly connected to the base station apparatus 120, the GW CP 134 transmits packets buffered in the GW UP-I 146 to the base station apparatus 120, I 146 and the GW UP-C 144 by setting the forwarding information to change the packet transmission path to the GW UP-C 144.

In FIGS. 5A and 5B, it is described that each process is sequentially executed, but it is not limited thereto. 5A and 5B may be modified or executed in parallel or one or more processes may be executed in parallel, so that the present invention is not limited to the time-series order of FIGS. 5A and 5B.

3 to 5 may be implemented as computer-readable codes on a computer-readable recording medium. A computer-readable recording medium includes all kinds of recording apparatuses in which data that can be read by a computer system is stored. That is, a computer-readable recording medium includes a magnetic storage medium (e.g., ROM, floppy disk, hard disk, etc.), an optical reading medium (e.g., CD ROM, And the like). The computer-readable recording medium may also be distributed over a networked computer system so that computer readable code can be stored and executed in a distributed manner.

The foregoing description is merely illustrative of the technical idea of the present embodiment, and various modifications and changes may be made to those skilled in the art without departing from the essential characteristics of the embodiments. Therefore, the present embodiments are to be construed as illustrative rather than restrictive, and the scope of the technical idea of the present embodiment is not limited by these embodiments. The scope of protection of the present embodiment should be construed according to the following claims, and all technical ideas within the scope of equivalents thereof should be construed as being included in the scope of the present invention.

As described above, the present embodiment is applied to a technique for transmitting downlink data to a terminal apparatus in an idle mode, thereby reducing transmission delay time and improving use efficiency of network resources by separating a control plane and a user plane of a gateway node , And the idle mode of the terminal device is supported, thereby making it possible to increase the battery usage time.

100: mobile communication system 110: terminal device
120: base station device 130: central cloud
132: MME 134: GW CP
136: PCRF 140: Edge Cloud
142: GW UP 144: GW UP-C
146: GW UP-I

Claims (17)

In a mobile communication system in which a gateway is divided into a user plane node (hereinafter referred to as 'GW UP') and a control plane node (hereinafter referred to as 'GW CP'), a method of transmitting a downlink packet with a different transmission path according to a mode of the terminal device In this case,
The GW CP changes the routing path of the downlink packet by transmitting a first forwarding table update command message to the first user plane node and the second user plane node as the terminal apparatus is switched to the idle mode step;
The first user plane node receiving and buffering the downlink packet and transmitting a reception notification message of the downlink packet to the GW CP;
The GW CP transmits a second forwarding table update command message to the second user plane node and the first user plane node corresponding to the reception acknowledgment message of the downlink packet so that the buffered downlink packet is transmitted to the second user plane node Passing to a planar node;
The second user plane node transmitting the buffered downlink packet to the terminal apparatus through the base station apparatus
Lt; / RTI >
Wherein the user plane node is separated into the first user plane node and the second user plane node, the first user plane node supporting the idle mode of the terminal device, And a connection mode is supported. The method according to claim 1,
Wherein the first forwarding table update command message comprises:
Wherein the message is a message instructing a forwarding table update to allow a first user plane node to receive a downlink packet generated in an idle mode of the terminal apparatus. The method according to claim 1,
And the second forwarding table update command message includes address information of the second user plane node. The method according to claim 1,
Wherein the first forwarding table update command message includes a predetermined buffering time and the first user plane node delays transmission of the reception notification message of the downlink packet until the buffering time expires. Packet transmission method. In a mobile communication system in which a gateway is divided into a user plane node (hereinafter referred to as 'GW UP') and a control plane node (hereinafter referred to as 'GW CP'), a method of transmitting a downlink packet with a different transmission path according to a mode of the terminal device In this case,
The GW CP transmitting a first forwarding table update command message to the first user plane node and the second user plane node as the terminal apparatus is switched to the idle mode;
Receiving the downlink packet by the second user plane node in response to the first forwarding table update command message and transmitting the downlink packet to the first user plane node;
The first user plane node buffering the downlink packet and transmitting a reception notification message of the downlink packet to the GW CP;
The GW CP transmits a second forwarding table update command message to the second user plane node and the first user plane node corresponding to the reception acknowledgment message of the downlink packet so that the buffered downlink packet is transmitted to the second user plane node Passing to a planar node; And
The second user plane node transmitting the buffered downlink packet to the terminal apparatus through the base station apparatus
Lt; / RTI >
Wherein the user plane node is separated into the first user plane node and the second user plane node, the first user plane node supporting the idle mode of the terminal device, And a connection mode is supported. 6. The method of claim 5,
Wherein the second user plane node and the first user plane node are connected by service chaining. 6. The method of claim 5,
Wherein the first forwarding table update command message comprises:
The second user plane node receives the downlink packet generated in the idle mode of the terminal apparatus and delivers the downlink packet to the first user plane node, and the first user plane node updates the forwarding table update And transmitting the downlink packet to the base station. 6. The method of claim 5,
And the second forwarding table update command message includes address information of the second user plane node. 6. The method of claim 5,
Wherein the first forwarding table update command message includes a predetermined buffering time and the first user plane node delays transmission of the reception notification message of the downlink packet until the buffering time expires. Packet transmission method. In a mobile communication system in which a gateway is divided into a user plane node (hereinafter referred to as 'GW UP') and a control plane node (hereinafter referred to as 'GW CP'), For a plane node,
Receives a first forwarding table update command message from the GW CP as the terminal device is switched to the idle mode, receives and buffers the downlink packet, and informs the GW CP of the reception of the downlink packet A first user plane node for transmitting a second forwarding table update command message from the GW CP and transmitting the buffered downlink packet to a second user plane node,
Receiving a first forwarding table update command message from the GW CP, receiving a second forwarding table update command message from the GW CP as the terminal apparatus is switched to the idle mode, And the second user plane node receiving the buffered downlink packet from the second user plane node. 11. The method of claim 10,
Wherein the second forwarding table update command message includes address information of the second user plane node. 11. The method of claim 10,
Wherein the first forwarding table update command message includes a predetermined buffering time and the first user plane node delays transmission of the reception notification message of the downlink packet until the buffering time expires. Node. In a mobile communication system in which a gateway is divided into a user plane node (hereinafter referred to as 'GW UP') and a control plane node (hereinafter referred to as 'GW CP'), For a plane node,
Receiving a first forwarding table update command message from the GW CP as the terminal device is switched to the idle mode, receiving a forwarding table update command message from the second user plane node in response to the first forwarding table update command message, And transmits a second forwarding table update command message from the GW CP to the GW CP in response to the reception notification message of the downlink packet. A first user plane node for receiving the buffered downlink packet and transmitting the buffered downlink packet to the second user plane node,
Receiving a first forwarding table update command message from the GW CP as the terminal apparatus is switched to the idle mode, receiving the downlink packet in response to the first forwarding table update command message, The second user plane node transmitting the second forwarding table update command message to the user plane node, receiving the second forwarding table update command message from the GW CP, receiving the buffered downlink packet, and transmitting the buffered downlink packet to the base station apparatus. 14. The method of claim 13,
Wherein the second user plane node and the first user plane node are connected by service chaining. 14. The method of claim 13,
Wherein the first forwarding table update command message comprises:
The second user plane node receives the downlink packet generated in the idle mode of the terminal apparatus and delivers the downlink packet to the first user plane node, and the first user plane node updates the forwarding table update To the user plane node. 14. The method of claim 13,
Wherein the second forwarding table update command message includes address information of the second user plane node. 14. The method of claim 13,
Wherein the first forwarding table update command message includes a predetermined buffering time and the first user plane node delays transmission of the reception notification message of the downlink packet until the buffering time expires. Node.

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