KR20160140106A - System for packet off-loading scheme using femto-cell local gateway and d2d communication at remote shipyards - Google Patents

Abstract

The present invention relates to a packet off-loading method, and more specifically, to an off-loading scheme applied to a remote shipyard to separate traffic, which exchanges important information between a higher level shipyard and a remote shipyard, from general traffic. According to the present invention, a packet off-loading system using a femto-cell local gateway and a D2D communication technology at remote shipyard includes a local gateway added beside SeNB to be tunneling-connected to a PDN gateway. When the tunneling-connection between the local gateway and the PDN gateway is constructed, an off-load state is registered at cache entry of the local gateway according to the cache entry stored in the local gateway, and then the off-load is performed, data is transmitted to the PDN gateway without the off-load, or an off-load through a D2D communication is performed, so that a traffic off-load is performed according to a network situation between the higher level shipyard and a lower level shipyard.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a femtocell local gateway of a remote shipyard and a packet offload system using D2D communication technology.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a packet offload method, and more particularly, to an offload technique that is applied to a remote shipyard to separate traffic and general traffic exchanging important information between an upper shipyard and a remote shipyard.

According to the related art, since all the traffic for using the Internet service in the communication process of the user terminal UE of the upper shipyard and the lower shipyard passes through the serving gateway (S-GW) and the PDN gateway (P-GW) If the traffic is concentrated, the communication speed between the upper shipyard and the lower shipyard is slow and the work can not be done properly.

Disclosure of Invention Technical Problem [8] The present invention has been proposed in order to solve the above-mentioned problems. By utilizing an LTE-based femtocell network and a D2D communication technology in a shipyard, a femtocell local gateway of a remote shipyard capable of tunneling connection and traffic distribution, The goal is to propose a load method.

The femtocell local gateway of the remote shipyard and the packet offload system using the D2D communication technology according to the present invention include a local gateway added next to the SeNB and tunneled to the PDN gateway. When a tunneling connection of the local gateway and the PDN gateway is established, Offloading is registered in the cache entry of the local gateway according to the cache entry stored in the gateway, offload is performed, data is transmitted to the PDN gateway without being offloaded, or offload is performed through D2D communication, And performs traffic offload according to the network situation between the shipyards.

According to the embodiment of the present invention, the shipyard performs various system management such as production / logistics / management at the sub-remote shipyard, real-time performance management of quality control, and tracking of marine surplus material based on LTE, It is also possible to send and receive calls between devices in the same place, such as transmission to the upper shipyard in a short period of time through a smart phone, to enable ultra-high-definition video conferencing, and to facilitate smooth execution of special field work in the shipbuilding industry, And the communication procedure can be greatly shortened.

The femtocell local gateway of the remote shipbuilder according to the present invention and the packet offload method using the D2D communication technique use a cache entry of the IPv6 offload and the D2D offload option and the local gateway (L-GW) It is possible to maximize the utilization and optimization of the network by enabling the traffic offload operation according to the network conditions.

The effects of the present invention are not limited to those mentioned above, and other effects not mentioned can be clearly understood by those skilled in the art from the following description.

1 is a diagram illustrating a traffic offload model in a shipyard according to an embodiment of the present invention.
2 is a flowchart illustrating a tunneling setup process and a traffic distribution process according to an embodiment of the present invention.
3 is a diagram illustrating a cache entry of a local gateway according to an embodiment of the present invention.
4 is a diagram illustrating an offload traffic process in a shipyard according to an embodiment of the present invention.
5 is a diagram illustrating a state transition diagram of a local gateway operation in accordance with an embodiment of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The above and other objects, advantages and features of the present invention and methods of achieving them will be apparent from the following detailed description of embodiments thereof taken in conjunction with the accompanying drawings.

The present invention may, however, be embodied in many different forms and should not be construed as being limited to the exemplary embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, And advantages of the present invention are defined by the description of the claims.

It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. In the present specification, the singular form includes plural forms unless otherwise specified in the specification. &Quot; comprises "and / or" comprising ", as used herein, unless the recited component, step, operation, and / Or added.

The LTE femtocell network is a small-scale mobile communication base station developed in the miniature form of a conventional mobile communication base station.

The LTE femtocell network provides a mobile communication area of several tens of meters radius by connecting mobile communication users directly to an existing Internet access network, unlike a base station having a coverage of several km radius.

D2D communication technology is a communication method that transmits direct traffic between terminals without going through infrastructures such as base stations and APs (Access Points). D2D communication improves resource efficiency and reduces infrastructure load compared to communication through existing infrastructure It is possible.

According to the embodiment of the present invention, by using the above-described Long Term Evolution (LTE) based femtocell local gateway and D2D (Device to Device) communication technology, the traffic exchanging important information between the upper shipyard and the remote shipyard, And a method of supporting an off-load for separating a plurality of signals from each other. Hereinafter, a preferred embodiment of the present invention will be described with reference to FIGS. 1 to 5.

Hereinafter, a traffic offload model of a remote shipyard according to an embodiment of the present invention will be described with reference to FIG.

The LTE-D2D technique applied in the present invention is as shown in FIG. 1, and the D2D Server 100 is added to the P-GW 90. FIG.

The D2D Server 100 plays a role of resource management, registration and management of a base station for D2D communication, and requests for beacon signals between devices.

According to the embodiment of the present invention, LTE-D2D technology can be applied to off-load data traffic by searching for devices in an upper shipbuilder or a lower shipyard to enable an efficient network configuration.

The traffic offload model in the shipyard according to the embodiment of the present invention is based on the local gateway L-GW 30 shown in FIG.

The model according to the embodiment of the present invention is characterized in that the L-GW 30 is added next to the SeNB 20 and all traffic is transmitted through the S-GW 80 and the P-GW 90 of the upper shipyard EPC network In the present invention, tunneling and D2D communication between the L-GW 30 and the P-GW 90 of the main shipyard are performed to control the direction of traffic transmission Thereby maximizing the efficiency of the shipyard network.

For example, voice and voice messaging services such as VoIP and instant messenger services, which are the voice telephone services in the upper shipyard where the main server is located, are handled through a mobile communication network.

In addition, the Internet video streaming service and the search service for various search engines, which do not need to go through the upper shipyard network, are directly transmitted to the Internet via the L-GW 30, thereby dispersing traffic aggregated to the upper shipyard.

In case of sharing related data such as work in the shipyard, meeting, etc., D2D communication can be performed to efficiently manage the traffic concentrated in the upper shipyard.

That is, the model according to the embodiment of the present invention is a traffic offload model for efficiently using the network through the traffic offload in the communication process of the UE of the upper shipyard and the UE 10 of the lower shipyard.

In the case of the existing system, it operates as shown in Flows 1 and 2 in FIG. That is, Flow (1) is a traffic processing path that is received through the eNB (50), and Flow (2) is a processing path of traffic that is received from the SeNB (20) which is a femtocell AP. In the existing system, all the traffic passes through E-S-GW (80) and P-GW (90) in order to use Internet service, so communication speed between upper and lower remote shipyards is slow when traffic is concentrated. I could not.

Otherwise, the traffic offload according to the embodiment of the present invention operates as shown in Flows (3), (4), and (5) of FIG.

Flow ③ is an offload processing path of traffic coming in through eNB 50. Flow ④ is a path where traffic offload is processed in SeNB 20 as a femtocell AP and Flow ⑤ The UE 10 of the shipyard is a traffic offload processing path through D2D communication.

The D2D server 100, which is a new functional block for applying the LTE-D2D technology for D2D communication, is put together with the P-GW 90 by processing the off-road by placing the L-GW 30 together with the SeNB 20 Traffic offloading via D2D communication is possible.

According to the embodiment of the present invention, it is possible to change the location of the gateway, and the traffic offload processing method can expect a route optimization effect even when viewed from the viewpoint of the whole network.

Hereinafter, a traffic offload procedure and operation according to an embodiment of the present invention will be described with reference to FIG.

  FIG. 2 is a message flow diagram according to an embodiment of the present invention. Referring to FIG. 2, the L-GW 30 connected to the SeNB 20 connected to the upper shipyard main server 100 A process of establishing a tunneling connection between the P-GW 90 serving as a relay point at the time of establishing a connection and a process of distributing traffic after establishing a connection.

The UE performs an authentication process when the UE 10 arrives at the shipyard, and the UE transmits a PDN tunneling request to the P-GW 90 with a PDN Connectivity Request message to the MME 70 in order to receive billing and Internet- Lt; / RTI >

The PDN Connectivity Request message contains address information of the L-GW connected to the SeNB 20.

The MME 70 receiving the PDN Connectivity Request message selects the P-GW 90 considering the location of the femtocell network and the service provider and transmits the address and tunneling of the L-GW 30 to the P- And sends a Create Session Request message containing the ID for the session.

The P-GW 90 receives the Create Session Request message and allocates an IP address to be provided with the service.

GW 30 transmits the information on the allocated IP address information and the traffic offload to the tunnel establishment request message including the IPv6 offload option and the D2D offload option (option field defined in the present invention) to the L-GW 30.

The L-GW 30 receiving the Tunnel Establishment Request message updates the information in the IPv6 offload option and the D2D offload option field to the cache entry and transmits a Tunnel Establishment Response message to the P-GW 90 as a response.

The P-GW 90 that has received the Tunnel Establishment Response message from the L-GW 30 transmits a Create Session Response message to the MME 70 to inform the tunneling connection.

The MME 70 transmits a PDN Connectivity Accept message to the SeNB 20 and a tunnel is established between the L-GW 30 and the P-GW 90 through the PDN Connectivity Complete message.

After the tunneling connection is established, the UE 10 is connected to the PDN via the P-GW without being offloaded 1) according to the cache entry and policy stored in the L-GW 30, , And 3) D2D communication to process offload traffic.

Through this process, packets passing through the S-GW 80 and the P-GW 90 can be significantly reduced.

According to an exemplary embodiment of the present invention, an IPv6 offload option and a D2D offload option header for offload related information transport are proposed. The header configuration includes a Next header, a Hader length, an Offload Flag, and an Ofload type option field.

If the Offload Flag is 1, it indicates that the packet is a general traffic offload packet, and the off-loading is registered in the cache entry of the L-GW 30 and offload is performed.

When the Offload Flag is 0, a process of transmitting data to the P-GW 90 through a tunnel as a packet which does not perform offloading is performed.

If the D2D Flag is 1, the SeNB 20 allocates channel resources through the D2D server 100 as a D2D communication packet, and performs D2D Discovery and offloading through D2D communication through link establishment.

Option includes information on traffic type such as voice, video, and text data to help determine traffic offload according to network situation.

As shown in FIG. 3, three fields are added to the cache entry of the actual L-GW 30 through the offload option header information included in the packets during the tunneling process.

Offload, D2D Flag field, Tunneling Interface ID field, traffic type, and QoS level, and enables routing of traffic based on the destination and characteristics. It supports routing to other directions.

Hereinafter, an offload operation process in the shipyard according to an embodiment of the present invention will be described with reference to FIG.

The operation in which the packet received from the UE is processed in the L-GW is the same as the traffic processing in Fig.

(S100), information is registered in the cache entry of the L-GW (S150), and the offload and D2D flag of the IPv6 offload option are confirmed (S200, S250).

If the offload flag is 1, the offload operation is performed. If the offload flag is 0, the tunneling interface ID is checked in the cache entry (S350).

If the tunneling interface ID has a value, data is transmitted to the corresponding tunnel (S400), and the tunneling state is updated (S500).

On the other hand, if the Tunneling Interface ID does not have a value, the tunneling process is performed (S450), the Tunneling Interface ID is confirmed again (S350), and the data is transmitted to the tunnel (S400).

When the D2D Flag is 1, the UE allocates channel resources from the SeNB or the eNB in order to perform off-loading through the D2D communication, performs D2D discovery, and performs D2D communication through the D2D Link Setup process when it finds a D2D device to communicate with (S300).

Hereinafter, protocol verification according to an embodiment of the present invention will be described with reference to FIG.

The IPv6 offload option and the D2D offload option field are added to the Tunnel Establishment Request message in order to verify the operation performance of the protocol according to the embodiment of the present invention. The L-GW 30 identifies the cache entry And traffic must be processed in three modes.

In order to verify the operational performance of the protocol according to the embodiment of the present invention, the operation process applied the offload technique in the shipyard is configured by using a state transition diagram.

The reason for choosing the state transition diagram as the verification method is that protocol verification can be performed through the state transition diagram in the embodiment of the present invention regarding the network configuration and the protocol configuration.

5 shows the operation of the L-GW (30) of the sub-remote shipyard analyzed by the state transition diagram.

When the UE 10 used in the shipyard sends a PDN Connectivity Request message to the MME 70 in order to receive a service in the RUNNING state not using the network, the L-GW 30 transitions to the SETUP state and sets the TUNNEL ESTABLISHED state, PDN CONNECTION state. In the TUNNEL ESTABLISHED state, updating the tunneling information and P-GW (90) information based on the IPv6 offload and D2D offload option is the most important operation.

The UE continues to operate in the RUNNING with Tunneling state unless the tunneling connection with the L-GW 30 is disconnected. When a new PDN connection request is received, the UE performs the tunneling connection and re-runs.

If the tunneling connection is terminated by the timeout or the request of the cache entry, the PDN Disconnection Request message is transmitted to the MME 70. If the value of N is 0, the RNNING state is transited to the RUNNING state, Only the corresponding tunneling connection is terminated and the UE returns to the RUNNING with Tunneling state to provide services to other UEs.

The RUNNING with Tunneling State operation is performed for each interface of a packet transmitted to the UE, a packet offloaded to the upper shipyard, a packet offloaded through D2D communication, and a packet transmitted to the P-GW 90 through tunneling.

The embodiments of the present invention have been described above. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. Therefore, the disclosed embodiments should be considered in an illustrative rather than a restrictive sense. The scope of the present invention is defined by the appended claims rather than by the foregoing description, and all differences within the scope of equivalents thereof should be construed as being included in the present invention.

10: User terminal 20: SeNB
30: Local gateway 40: SeNB-GW
50: eNB 60: FAQ
70: MME 80: Serving gateway
90: PDN gateway 100: D2D server
110: main server 120: PCRF

Claims (2)

A local gateway added next to SeNB and tunneled to the PDN gateway,
If a tunneling connection is established between the local gateway and the PDN gateway, the tunneling connection is registered in the cache entry of the local gateway according to the cache entry stored in the local gateway and offload is performed, or data is transmitted to the PDN gateway without being off- Or perform offloading through D2D communication to perform traffic offload according to the network conditions between upper shipyard and lower shipyard
A femtocell local gateway of a remote shipyard and a packet offload system using D2D communication technology.
The method according to claim 1,
The cache entry of the local gateway includes a field related to an offload flag, a D2D flag, a tunneling interface ID, a traffic type, and a QoS level
A femtocell local gateway of a remote shipyard and a packet offload system using D2D communication technology.

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