KR101463746B1 - Method and system for codec controlling in network handover - Google Patents

Abstract

The present invention relates to a method and system for controlling a codec in a heterogeneous network handover. When a strength value of a wireless communication signal from a first network to a mobile node is smaller than a preset value, a codec server Receiving from a mobile node a first request signal requesting codec information of a network connectable at a node side, and in response to a first request, the codec server transmits network codec information accessible from a mobile node side to a mobile node side, When the mobile node attempts to connect to the second network based on the network codec information, a correspondent node transmits data traffic to the mobile node side.

Network, handover, mobile node, codec

Description

TECHNICAL FIELD [0001] The present invention relates to a codec control method and system for handover between heterogeneous networks,

The present invention relates to a codec control method and system for heterogeneous network handover, and more particularly, to a codec control method and system capable of providing seamless service in heterogeneous network handover.

In general, a mobile network has a low data rate, a high service fee and high mobility, while a wireless LAN (WLAN) has a high data rate, a low service fee, and low mobility.

Under such a background, in the case of a terminal supporting both a mobile phone function and a wireless phone function, an expensive mobile communication network is used for high-speed movement and a low-cost wireless LAN is used for stopping or moving at low speed If used, the subscriber can save the call cost, and the service provider can accommodate more users or support various services through efficient allocation of radio resources.

Meanwhile, Mobile IP is a proposed IETF standard protocol to support IP mobility without modification of existing internet protocol. It guarantees current connection even when mobile node (MN) with IP address moves It is a necessary skill.

In the existing Internet protocol, since the service is performed on the assumption that the position of a terminal accessing the Internet is fixed and a fixed IP address is used in the connected network, when the IP address is changed to another access network, .

With Mobile IP, it is possible to support the mobility of the terminal through the binary address system so that the connection can be continued.

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above problems, and it is an object of the present invention to provide a media codec technology considering a next generation network such as a 4G mobile communication network and to provide an efficient codec service for heterogeneous network handover through a next generation network I want to.

In addition, the present invention can quickly acquire network information, available bandwidth information, codec type information, codec encoding mode information, and network class information to be newly connected before the handover is completed based on a codec server So that the service disconnection can be minimized or prevented even when a new network is connected.

In addition, the present invention can be applied to a mobile network, a wireless LAN, a WiMAX (World Interoperability for Microwave Access), a wireline, an ad-hoc network (Ad (hereinafter referred to as " HANDS ") and a " -hoc network ").

The present invention also provides a method and system for introducing a codec server (CS) in a handover between heterogeneous networks in a mobile IP-based network to improve packet delay and packet loss due to handover delay, , A change of a network, a codec, and a bandwidth due to a handover.

According to an aspect of the present invention, there is provided a method for controlling a CODEC in a heterogeneous network handover, the method comprising the steps of: determining a strength value of a wireless communication signal from a first network to a mobile node Receiving, from the mobile node, a first request signal for requesting codec information of a network accessible from the codec server (Codec Server) on the side of the mobile node, in response to the first request, When the mobile node attempts to connect to the second network based on the network codec information, a correspondent node transmits the network codec information to the mobile node, And transmitting data traffic to the mobile node side.

According to another aspect of the present invention, the codec server receives a codec request according to a selection of a second network of the mobile node that has received the network information, and transmits the codec request to the second node And transmitting the codec to be used at the time of connection to the base station.

According to another aspect of the present invention, the codec server periodically receives codec bit rate information from the mobile node, the codec server transmits codec mode information according to the codec bit rate information to the mobile node, and Further comprising the step of the counter node receiving a change request of the codec mode according to the codec mode information from the mobile node.

According to another aspect of the present invention, there is provided a mobile communication system including a mobile network, a wireless LAN, a WiMAX (World Interoperability for Microwave Access), a wireline, an Ad- hoc network, and the network codec information includes at least one of available network information, available bandwidth information, codec type information to be used, codec encoding mode information, and network class information.

According to another aspect of the present invention, the codec server receives a codec request according to a selection of a second network of the mobile node that has received the network information, and transmits the codec request to the second node Wherein the codec server transmits a codec to be used at the time of connection to the second network to the mobile node side before connection of the mobile node to the second network .

A codec control system in a heterogeneous network handover according to an aspect of the present invention is characterized in that when a strength value of a wireless communication signal from a first network to a mobile node is smaller than a preset value, A codec server for receiving a first request signal requesting codec information from the mobile node and transmitting network codec information accessible from the mobile node side to the mobile node in response to the first request; And a correspondent node for transmitting data traffic to the mobile node when the mobile node attempts to connect to the second network based on the network codec information.

According to another aspect of the present invention, the codec server receives a codec request according to a selection of a second network of the mobile node that has received the network information, and transmits the codec request to the mobile node in response to the codec request. And transmits the codec to be used at the time of connection to the Internet.

According to another aspect of the present invention, the codec server periodically receives codec bit rate information from the mobile node, the codec server transmits codec mode information according to the codec bit rate information to the mobile node, Receives a codec mode change request according to the codec mode information from the mobile node.

According to another aspect of the present invention, there is provided a mobile communication system including a mobile network, a wireless LAN, a WiMAX (World Interoperability for Microwave Access), a wireline, an Ad- hoc network, and the network codec information includes at least one of available network information, available bandwidth information, codec type information to be used, codec encoding mode information, and network class information.

A method of controlling a mobile node in a heterogeneous network handover according to an aspect of the present invention includes the steps of: when a strength value of a wireless communication signal from a first network is smaller than a preset value, Receiving, from the codec server, network information connectable at the mobile node side in response to the first request; and transmitting the network codec information to the codec server based on the network codec information, 2 network, and receiving data traffic from the correspondent node.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings and accompanying drawings, but the present invention is not limited to or limited by the embodiments. Like reference symbols in the drawings denote like elements.

1 to 10 are views for explaining a CODEC control method in a heterogeneous network handover according to an exemplary embodiment of the present invention.

Referring to FIGS. 1 to 10, description will be made of a technique for controlling a codec to provide seamless service upon heterogeneous network handover based on a codec server (CS).

Since the codec server 120 is connected to the IP core network 120, it can quickly communicate with various networks connected to the IP core network 140. The codec server 120 may be implemented as a single server independent of an information server (IS), or as a single system in which a codec server and an information server are integrated.

As shown in FIG. 1, a correspondent node (CN) 130 transmits data traffic to a mobile node (MN) During the traffic transmission / reception as described above, the mobile node 110 periodically reports the channel status to the codec server 120 side.

In this case, the correspondent node 130 refers to a fixed type mobile terminal that receives a packet from the mobile node 110 in the mobile IP network.

2, when the signal from the wireless LAN (WLAN) 250 is weakened due to the movement of the mobile node 210, the mobile node 210 transmits a signal to the codec server 220 side, Request network information.

At this time, the network information requested by the mobile node 210 includes available network information, available bandwidth information, codec type information to be used, codec encoding mode information, and network class information.

3, in response to a request from the mobile node 310, the codec server 320 informs the mobile node 310 of available network information, available bandwidth information, type information of the codec to be used, , Network class information, and the like.

Then, as shown in FIG. 4, the mobile node 410 decides to connect to the adjacent network and attempts to connect to the neighboring network 460. At this time, an attempt is made to connect to the adjacent network 460 by using the MIH (media independent handover) function and the L2 / L3 fast handover function.

For example, if the signal from the WLAN network 450 is weak while the mobile node 410 is currently connected to the WLAN network 450, it may attempt to connect to the neighboring 3GPP UMTS network 460 .

5, the mobile node 510 requests a codec to be used in the network 560 to be newly connected to the codec server 520 together with an attempt to connect to the adjacent network 560, and downloads the codec.

At this time, the request and download process of the codec is performed before the end of the handover to the adjacent network 560, and is used when connecting to the network to the adjacent network 560, thereby preventing the traffic service from being disconnected.

6, the mobile node 610 adjusts the codec bit rate according to the network information acquired from the codec server 620 according to the situation of the newly connected neighboring network 660 And notifies the correspondent node 630 of an appropriate codec encoding mode so as to transmit the data traffic.

In particular, the process of communicating the codec encoding mode to the counterpart node 630 to adjust the codec bit rate is performed through the interface of the existing connected wireless LAN network 650 before the handover to the adjacent network 560 is completed Respectively.

7, the correspondent node 740 can transmit data traffic to the mobile node 710 using the adjusted new codec bit rate, so that the mobile node 710 can transmit data traffic to the mobile node 710 through the modern connection It is possible to access the best possible network and receive the optimum service.

8, the mobile node 810 periodically monitors the channel status and transmits the information to the codec server 820 to update the codec bit rate information to match the current channel status have.

9, the codec server 920 transmits a new codec encoding mode to the mobile node 910 when a codec encoding mode change is required.

10, the mobile node 1010 requests the correspondent node 1030 to change the codec encoding mode, and the correspondent node 1030 accepts the encoding mode change request to transmit the new codec bit rate to the mobile node 1010 ) Side.

Therefore, after the handover is completed, the mobile node periodically monitors the channel status, and transmits the information to the correspondent node to update the codec bit rate information.

11 is a configuration diagram illustrating a codec control system in a heterogeneous network handover according to an exemplary embodiment of the present invention. A codec control system in a heterogeneous network handover according to an exemplary embodiment of the present invention will be described with reference to FIG.

The codec control system 1100 according to an example of the present invention includes a codec server (CS) 1120 and a correspondent node (CN) 1130 as shown in FIG. At this time, the codec server (CN) may be implemented as a separate server from the information server (IS), or as a single system in which the codec server and the information server are integrated.

The mobile node transmits a first request signal to the codec server (CS) 1120 side requesting the information of the connectable network when the intensity value of the wireless communication signal of the connected first network is smaller than the predetermined value.

In response to the first request, the codec server (CS) 1120 sends connectable network information at the mobile node side to the mobile node side. The codec server (CS) 1120 may be implemented as a stand-alone server or as a single system.

Thereafter, the mobile node selects a second network based on the received network information, requests the codec server 1120 to use a codec to be used when connecting to the second network,

The correspondent node (CN) 1130 receives from the mobile node a second request signal for adjusting the codec bit rate of the received codec and transmitting the data to the mobile node. In response to the second request signal, .

In particular, the mobile node periodically transmits the codec bit rate information to the codec server 1120, the codec server 1120 transmits the codec mode information according to the codec bit rate information, the mobile node receives the codec mode information, The node 1130 may request the codec mode change to the node 1130 side.

That is, the mobile node periodically monitors the channel status, and transmits the information to the codec server 1120 to update the codec bit rate information to match the current channel status.

At this time, the mobile node requests the codec server 1120 to use a codec to be used when connecting to the second network before connecting to the second network.

In addition, the network information may include at least one of a mobile network, a wireless LAN, a World Interoperability for Microwave Access (WiMAX), a wireline, and an ad-hoc network Information related to one.

12 is a flowchart illustrating a codec control method in a heterogeneous network handover according to an exemplary embodiment of the present invention.

A codec control method in a heterogeneous network handover according to an exemplary embodiment of the present invention will be described with reference to FIG.

When the strength of a wireless LAN communication signal between a mobile node and a first network to which the mobile node is connected is less than a predetermined communication signal intensity value, The request signal is transmitted to the codec server side (S1210).

The codec server receives the first request signal, and transmits network information connectable to the mobile node to the mobile node in response to the first request signal (S1220).

The mobile node receives the network information, selects a second network based on the received network information (S1230), and transmits the codec to be used on the second network side for connection to the selected second network To the codec server, and receives a codec to be used by the second network from the codec server (S1240).

The steps S1230 and S1240 are performed through the interface of the existing wireless LAN network 650 before the handover to the adjacent network 560 is completed.

In step S1250, the mobile node provides a second request signal for adjusting the bit rate of the codec corresponding to the second network to the counterpart node based on the network information.

The counter node receives the second request signal and provides data with the adjusted codec bit rate to the mobile node in response to the adjustment request signal (S1260).

The mobile node periodically transmits the codec bit rate information to the codec server side, the codec server transmits the codec mode information according to the codec bit rate information, the mobile node receives the codec mode information, Of the user.

The network information may include at least one of a Mobile Network, a Wireless LAN, a World Interoperability for Microwave Access (WiMAX), a Wireline, and an Ad-hoc network. Information related to one.

According to the codec control method in the heterogeneous network handover, based on the codec server, the available network information to be newly connected before the handover is completed, the available bandwidth information, the type information of the codec to be used, Mode information, network class information, and the like can be acquired quickly so as to minimize or prevent the interruption of the service even if the new network is connected.

While the invention has been shown and described with reference to certain preferred embodiments thereof, it will be understood by those of ordinary skill 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. This is possible.

Therefore, the scope of the present invention should not be limited to the described embodiments, but should be determined by the equivalents of the claims, as well as the claims.

1 to 10 are views for explaining a CODEC control method in a heterogeneous network handover according to an exemplary embodiment of the present invention.

11 is a configuration diagram illustrating a codec control system in a heterogeneous network handover according to an exemplary embodiment of the present invention.

12 is a flowchart illustrating a codec control method in a heterogeneous network handover according to an exemplary embodiment of the present invention.

Description of the Related Art

110: mobile node

120: Codec server

130: Relative node

250: Wireless LAN

460: Adjacent network

Claims (10)

When a strength value of a wireless communication signal from a first network to a mobile node is smaller than a predetermined value, a codec server transmits a first request signal for requesting codec information of a network accessible from the mobile node, From the mobile node; In response to the first request, transmitting, by the codec server, network codec information connectable at the mobile node side to the mobile node side; Determining, based on the connectable network codec information, that the mobile node is a network to which a second network is to be connected; And When the mobile node attempts to connect to the second network based on the network codec information, a Correspondent Node transmits data traffic to the mobile node side Wherein the codec control method comprises: The method according to claim 1, The codec server receives a codec request according to a selection of a second network of the mobile node that has received the network information, and transmits a codec to be used for connection to the second network to the mobile node in response to the codec request Step The method comprising the steps of: (a) receiving a signal from a base station; The method according to claim 1, The codec server periodically receiving codec bit rate information from the mobile node; The codec server transmitting codec mode information according to the codec bit rate information to the mobile node; And Receiving, by the correspondent node, a change request of a codec mode according to the codec mode information from the mobile node The method comprising the steps of: (a) receiving a signal from a base station; The method according to claim 1, The network comprising: A mobile network, a wireless LAN, a WiMAX (World Interoperability for Microwave Access), a wireline, and an ad-hoc network, The network codec information includes: The available bandwidth information, the available bandwidth information, the type of the codec to be used, the codec encoding mode information, and the network class information. 3. The method of claim 2, The codec server receives a codec request according to a selection of a second network of the mobile node that has received the network information, and transmits a codec to be used for connection to the second network to the mobile node in response to the codec request The transmitting step includes: Wherein the codec server is configured to transmit a codec to be used for connection to the second network to the mobile node before connection to the second network of the mobile node. Way. From the mobile node, a first request signal for requesting codec information of a network accessible from the mobile node side when the intensity value of the wireless communication signal from the first network to the mobile node is smaller than a preset value A codec server for transmitting network codec information accessible from the mobile node side to the mobile node in response to the first request; And A correspondent node for transmitting data traffic to the mobile node side when the mobile node attempts to connect to the second network based on the network codec information, Wherein the codec control unit comprises: The method according to claim 6, Wherein the codec server comprises: Receiving a codec request according to a selection of a second network of the mobile node that has received the network information and transmitting a codec to be used for connection to the second network to the mobile node in response to the codec request, Codec Control System for Heterogeneous Manganese Handover. The method according to claim 6, Wherein the codec server comprises: Periodically receiving codec bit rate information from the mobile node, transmitting the codec mode information according to the codec bit rate information to the mobile node, The correspondent node, And a codec mode change request according to the codec mode information is received from the mobile node. The method according to claim 6, The network comprising: A mobile network, a wireless LAN, a WiMAX (World Interoperability for Microwave Access), a wireline, and an ad-hoc network, The network codec information includes: The available network information, the available bandwidth information, the type of the codec to be used, the codec encoding mode information, and the network class information. Transmitting a first request signal for requesting information of a network to which the mobile node is connectable to a codec server when the strength value of the wireless communication signal from the first network is smaller than a predetermined value; Receiving network information accessible from the codec server at the mobile node side in response to the first request; Determining, based on the connectable network codec information, that the mobile node is a network to which a second network is to be connected; And Attempting to connect to the second network based on the network codec information, and receiving data traffic from the counterpart node Wherein the codec control method comprises:

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