KR100459554B1 - Method for multicast-transmitting packet data in wireless communication network - Google Patents

Abstract

The present invention relates to a packet data multiplex transmission method for transmitting the same packet data to a plurality of mobile terminals in a mobile communication network. The present invention relates to storing a plurality of hosts requesting the same packet service corresponding to a requested packet service, In response to receiving packet data from an external network, the present invention proposes a packet data multi-transmission method comprising establishing a connection to each of a plurality of hosts stored in response to a packet service and transmitting the received packet data through the established connections. do. Therefore, in addition to providing a variety of services to the host, the mobile communication network can effectively provide the same packet service to a plurality of hosts.

Description

Packet data multi-transmission method in mobile communication network {METHOD FOR MULTICAST-TRANSMITTING PACKET DATA IN WIRELESS COMMUNICATION NETWORK}

The present invention relates to a packet data transmission method in a mobile communication network, and more particularly, to a packet data multiple transmission method for transmitting the same packet data to a plurality of mobile terminals.

In general, a mobile communication system is a system that provides various wireless communication services for voice, data, and the like through a mobile communication network, and the mobile communication system may be divided by a multiplexing method. A representative example thereof is a code division multiple access (hereinafter referred to as "CDMA") mobile communication system, and the CDMA mobile communication system refers to a mobile communication system that adopts a CDMA scheme to perform a wireless communication service. The CDMA mobile communication system has been developed from the IS-95 standard focused on transmitting / receiving voice signals, and has been discussed as an IMT-2000 standard capable of transmitting high speed data as well as voice. The IMT-2000 standard aims to provide services such as high quality voice, moving picture, and Internet search.

As described above, various methods for providing services such as voice and data are implemented in the mobile communication system, and representative examples thereof may be classified into a circuit switched mobile communication network and a packet switched mobile communication network. The network configuration in such a mobile communication system requires a configuration capable of transmitting voice and data more efficiently. This demand will be more urgent in the next generation mobile communication system (IMT-2000), which is expected to increase the amount of data to be transmitted as more various services are provided.

However, the standard for packet data transmission in the next generation mobile communication system, which is currently being worked on, standardizes only a unit-cast service. That is, only a unit transmission service for transmitting packet data received from an external network to a specific mobile terminal (hereinafter referred to as "MS") has been standardized.

In more detail, the mobile communication network registers an Internet Protocol (IP) address corresponding to the specific MS by a request from the specific MS and establishes a connection with the specific MS. do. Therefore, upon receiving packet data from an external Internet network for the registered IP address, the mobile communication network buffers the received packet data and transmits the packet data to the specific MS through the established connection.

1 is a diagram illustrating a procedure for packet data transmission according to a unit transmission service in the above-described conventional mobile communication network. Steps 101 to 111 of FIG. 1 show a signal flow for setting a data path by a control message provided through a control path. Steps 113 to 119 of FIG. 1 show a signal flow for transmitting packet data through the set data path.

Referring to FIG. 1, in step 101, the MS sends a PDP connection request message to an SGSN (Serving GSN, GSN; GPRS Supporting Node) by specifying a desired Quality of Service (QOS). The SGSN sends a Radio Access Bearer Assignment Request (UTRAN) to a UMTS Terrestrial Radio Access Network (UTRAN) by specifying a TEID 1, QOS, and SGSN IP address in response to the Activate PDP Context Request in step 103. The Radio Access Bearer Assignment Request is transmitted to a specific RNC in which the MS is located among Radio Network Controllers (RNCs) in the UTRAN 102. The TEID 1 is an identifier for identifying a path for transmitting a packet from the SGSN to the RNC. That is, the SGSN attaches its own TEID 1 to the header of the packet data to be transmitted, and the RNC receives the packet transmitted by the SGSN to its own terminal through the TEID 1 attached to the header of the packet data. It can be determined whether the data. The SG-IP represents a usage IP from the SGSN to the RNC, and the QOS represents a quality of service that the SGSN can support.

In step 105, the RNC designates a TEID 2, QOS, and RNC IP address in response to the Radio Access Bearer Assignment Request, and sends a Radio Access Bearer Assignment Response to the SGSN. The TEID 2 is an identifier for identifying a path for transmitting a packet from the RNC to the SGSN. That is, the RNC attaches and transmits the TEID 2 allocated to the header of the packet data to be transmitted, and the SGSN receives the packet transmitted by the RNC to itself through the TEID 2 attached to the header of the packet data. It can be determined whether the data. The RN-IP represents a usage IP from the RNC to the SGSN, and the QOS represents a quality of service that the RNC can support. The GTP path between the RNC and the SGSN is established through steps 103 and 105 described above.

On the other hand, the SGSN generates a TEID 3 for the requested PDP connection in response to the PDP connection request message (Activate PDP Context Request) in step 101. Meanwhile, the SGSN inserts the generated TEID 3 with the QOS in the Create PDP Context Request message in step 107 and sends the generated TEID 3 to the Gateway GSN (GGSN). The TEID 3 is an identifier for identifying a path for transmitting a packet from the SGSN to the GGSN. That is, the SGSN attaches the TEID 3 allocated to the header of the packet data to be transmitted, and determines that the received GGSN is the packet data transmitted to itself through the TEID 3 attached to the header of the packet data. can do. The QOS indicates a quality of service that the SGSN can support with the GGSN.

The GGSN sends a Create PDP Context Response message to the SGSN by specifying TEID 4 and QOS in response to the Create PDP Context Request message in step 109. The TEID 4 is an identifier for identifying a path for transmitting a packet from the GGSN to the SGSN. That is, the GGSN attaches and transmits the TEID 4 allocated thereto to the header of the packet data to be transmitted, and the received SGSN determines that the packet data is transmitted to the UE through the TEID 4 attached to the header of the packet data. Can be. The QOS indicates a quality of service that the GGSN can support with the SGSN. The SGSN sends an active PDP context accept message (Activate PDP Context Accept) specifying the QOS negotiated by the above-described operation to the corresponding MS. The QOS is a QOS that can be serviced in the current network. When the setup procedure is completed by the above-described operation, the SGSN can route packet data (PDP PDU) between the MS and the GGSN, thereby enabling communication between the MS and the GGSN.

For example, the packet data (PDP PDU) transmitted from the MS is provided to the RNC, and the RNC transmits the packet data to the SGSN by TEID 1 allocated from the SGSN in step 113. The SGSN receives the packet data through the TEID 1 and transmits the packet data to the GGSN by the TEID 4 allocated from the GGSN in step 115.

Meanwhile, the GGSN transfers packet data to be delivered to the MS to the SGSN by TEID 3 allocated from the SGSN in step 117. The SGSN receives the packet data through the TEID 3 in step 119 and delivers the packet data to the RNC by TEID 2 allocated from the RNC. The RNC delivers the received packet data to the MS.

As described above, the conventional mobile communication network supports a unit transmission service for transmitting a packet received from the Internet only to a specific host, not to a multiple transmission service. As a result, services such as VOD, video conferencing, and broadcasting, which are expected to be popularized in the future, are not available. That is, it is impossible to simultaneously service the same data to a plurality of hosts through a service by a conventional mobile communication network.

Accordingly, an object of the present invention for solving the above problems is to provide a multiple transmission method for transmitting the same packet data to a plurality of mobile terminals.

Another object of the present invention is to provide a multiple transmission method for managing a memory table for transmitting the same packet data to a plurality of mobile terminals.

It is still another object of the present invention to provide a method for managing Internet protocol addresses of a plurality of mobile terminals to simultaneously transmit the same packet data.

The present invention for achieving the above object is to store the addresses of the hosts (mobile terminals) requiring the multi-transmission service, and buffer the packet data received from the Internet by the multi-transport service while the multi-transport service We propose a multi-transmission method that forwards the buffered packet data by simultaneously creating a connection to all hosts that require.

In addition, in addition to the above proposal, the packet data received after the connections with all the hosts requiring the multi-transmission service are automatically forwarded through all the connections, so that the multi-transmission service can be realized. Suggest a method.

1 is a diagram illustrating a procedure for transmitting packet data according to a unit transmission service in a conventional mobile communication network.

2 is a view showing the configuration of a mobile communication network for applying the present invention.

3 is a diagram conceptually illustrating a mobile communication network according to an embodiment of the present invention;

FIG. 4 is a diagram showing a protocol of each configuration shown in FIG.

5 is a diagram illustrating a control flow of registering a plurality of hosts according to an exemplary embodiment of the present invention.

6 is a diagram illustrating a control flow for multiplexing packet data to a plurality of hosts according to an embodiment of the present invention.

Hereinafter, described in detail with reference to the accompanying drawings in accordance with an embodiment of the present invention.

2 is a diagram illustrating a configuration of a mobile communication network for supporting a packet data multiplexing service according to an exemplary embodiment of the present invention.

Referring to FIG. 2, mobile stations (MSs) 200 are connected to a base station (UTRAN) 202. In a mobile communication system, a core network is composed of SGSNs 212a and 112b and GGSNs 218a and 218b. The second layer of the connection between the UTRAN 202 and the SGSNs 212a and 212b uses an asynchronous transmission mode (ATM), and a specific connection is defined between the SGSNs 212a and 212b and the GGSNs 218a and 218b. Not. However, in the two sections, Layer 3 commonly uses the Internet Protocol (IP). The GGSNs 218a and 218b manage nodes IP addresses of GPRS users connected as nodes connecting a network to the Internet. The mobile communication network determines which SGSN the MS is connected to based on the address. The SGSNs 212a and 212b serve as PDP configuration with the GGSNs 218a and 218b and the UTRAN 202 as nodes serving the MS 110. The UTRAN 202 is a logical concept composed of a plurality of radio network controllers (RNCs) for allocating and controlling radio resources.

As described above, in the CDMA mobile communication system, the MS 200 needs to establish a connection with the GGSNs 218a and 218b in order to receive packet service. At this time, a GPT tunnel should be established between the UTRAN 202 and the GGSNs 218a and 118b. That is, the GPT path is divided into one section between the UTRAN 202 and the SGSNs 212a and 212b and another section between the SGSNs 212a and 212b and the GGSNs 218a and 218b. The GTP paths in the respective sections are classified by a predetermined identifier, and a Tunnel Endpoint IDentifier (TEID) is commonly used as the predetermined identifier. In this case, in order to support the multicast service proposed by the present invention, the GGSNs 218a and 218b must manage the connection of the MSs 200 that require the multicast service. For example, managing the connection of the MSs 200 may be a form of managing the MSs requesting the same packet service as a bundle. In addition, the GPT paths to each of the MSs managed in the single bundle must be managed.

The GTP packet provided through the UTRAN 202 is relayed from the SGSN 212a and 212b to the GGSN 218a and 218b based on the TEID. The GGSNs 218a and 218b connect GTP packets relayed to them to the Internet. Meanwhile, the GGSNs 218a and 218b analyze packet data received from the Internet network in response to a predetermined service and, when the corresponding service is determined by the analysis, manages the GTPs of the MSs 200 corresponding to the service. Send through the paths. The packet data transmitted from the GGSNs 218a and 218b will be provided to the predetermined SGSNs 212a and 212b, and the predetermined SGSNs 212a and 212b transmit the packet data to the MSs 200 requesting the service. send.

Although not shown separately in the configuration shown in FIG. 2, the MS 200 and the GGSNs 218a and 218b are divided into a control path for control and a data path for transmitting packet data (GTP path). Lose. Therefore, the core network sets the data path for transmitting the packet data by processing the control message through the control path, and the packet data is transmitted through the set data path.

3 is a diagram conceptually illustrating a mobile communication network according to an exemplary embodiment of the present invention. Referring to FIG. 3, the SGSN 212 serving as a PDP configuration with the GGSN 218 and the UTRAN 202 as a node serving a host includes a MIP 310 and an ATM switch 312. The MIP 310 manages IP and performs overall control according to the connection establishment with the GGSN 218. The ATM switch 312 receives the information according to the connection establishment from the MIP 310 and transfers packet data from the host to the GGSN 218 through the established connection. In addition, the ATM switch 312 transmits the packet data transmitted from the GGSN 218 to the corresponding host.

Meanwhile, the GGSN 218 which manages IP addresses of GPRS users connected as nodes connecting a network and an Internet network is composed of a MIP 314 and an ATM switch 316. The MIP 314 performs overall control for establishing a connection with the SGSN 212. The ATM switch 316 receives packet data from the SGSN 212 and transmits it to the Internet network or at least one SGSN 212 to which packet data from the Internet network is established by the MIP 314. To pass).

Meanwhile, an example of the protocol hierarchy of the configurations shown in FIG. 3 is as shown in FIG. 4.

Referring to FIG. 4, each of the elements constituting the core network (Network Elements) is based on IP. This is distinct from IP in the upper layer. For example, when a host is in IP communication, the IP of the host is equivalent to the IP of the GGSN 218. On the other hand, it is obvious that this information is also equal to UTRAN 202 and SGSN 212. In this case, the network has two levels of IP layers. As a reference for the lower IP, a PTP UDP connection is established between the UTRAN 202, the SGSN 212, the SGSN 212, and the GGSN 218. Layer 2 between the UTRAN 202 and the SGSN 212 is defined as ATM / AAL5, and layers 1 and 2 between the SGSN 212 and the GGSN 218 are not limited. GTP works over UDP.

For packet communication of the host, a GTP tunnel through PDP session activation must be established between the host and the GGSN 218. This is called PDP setup, and the control message for setting up the GTP tunnel is called GTP-C. The PDP session activation method may be proposed in various ways by the requesting subject. However, in the following description, it is assumed that the request is based on the request of the most basic host.

Hereinafter, an operation according to an embodiment of the present invention will be described in detail with reference to the above-described drawings. First, an operation according to an exemplary embodiment of the present invention generally includes an operation of registering a multiple transmission service and an operation of performing a multiple transmission service. Therefore, in the operation description to be described later, the two operations will be described separately.

First, an operation of registering a multicast service according to an exemplary embodiment of the present invention will be described in detail with reference to the accompanying drawings. The operation of registering the multicast service can be proposed by two methods. The first method is by the user through the host, and the second method is by the operator of the service provider at the request of the user. The second method is possible by registering a packet service to be provided with a corresponding host IP in a device that supports a packet service of a mobile communication network by receiving a request of a specific packet service from a user. Therefore, the operation to be described later will be described only for the operation by the first method.

The host user requests a specific packet service to the mobile communication network through the host in order to receive a desired packet service among various packet data services. The packet services may be VOD, video conferencing, broadcasting, and the like, and each of the packet services is identified by a unique identifier. For example, multicast IP may be used to distinguish the packet service. That is, "224.0.0.9" may be used as the multicast IP corresponding to the VOD, and "224.0.0.10" may be used as the multicast IP corresponding to the video conference. Meanwhile, in requesting a specific packet service, the host uses its own address "host IP" to distinguish it from other hosts. The host IP is given unique values for each of the hosts, and the method of granting the host IP may include permanent grant and temporary grant. The permanent grant is a method in which the host IP assigned to each of the hosts does not change forever, and the temporary grant is a method of granting the host IP to the host as needed.

Accordingly, the host constructs a service request message including a host IP and a multicast IP assigned to the host for requesting a specific packet service, and transmits the service request message to the mobile communication network. The service request message sent from the host is provided to the RNC to which the host belongs, and the received RNC transmits the service request message to the SGSN 212 constituting the core network (CN). Meanwhile, the SGSN 212 provides the service request message to the GGSN 218. In this case, the service request message provision from the SGSN 212 to the GGSN 218 may be performed by an upper processor (MIP) 310 of the SGSN 212 and an upper processor (MIP) 314 of the GGSN 218. The MIP 314 of the GGSN 218 notifies the ATM switch 316 when the service request message is provided.

The ATM switch 316 of the GGSN 218 monitors whether a packet service request message from a specific host is received in step 510 of FIG. 5. If the packet service request message from the specific host is received in step 510, the GGSN 218 proceeds to step 512. The ATM switch 316 of the GGSN 218 proceeds to step 512 to register a host IP in a multicast join table in response to the requested packet service (multicast IP). On the other hand, if the requested packet service is already a service requested by another host, it is registered together with the previously requested host IP. For example, a host that already has a packet service of multicast IP "224.0.0.10" requested by two hosts whose host IPs are "1.1.1.5" and "1.1.1.7" is "1.1.1.1" as the host IP. Assume that a packet service of the multicast IP "224.0.0.10" is requested from the network. In this case, an example of the multicast join table managed by the ATM switch 316 of the GGSN 218 is shown in Table 1 below.

multicast IP host IP 224.0.0.10 1.1.1.1 1.1.1.5 1.1.1.7

As shown in Table 1, it can be seen that a plurality of hosts requesting the same packet service for one packet service is registered for the multi-transmission service.

When the registration of the packet service request message from the specific host is completed by the above-described operation, the ATM switch 316 of the GGSN 218 proceeds to step 514 to request the provision of the packet service to the Internet.

Next, an operation of performing a multi-transmission service according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

First, a multicast routing protocol (DVMRP, PIM-SM, PIM-DM, MOSPF, etc.) should operate in the GGSN 218, and routers attached to the Internet network have the same protocol (protocol). ) Should work. In this case, the GGSN 218 becomes an edge router of a multicast routing domain. Therefore, if IGMP registers with the next router in the Internet for the multicast service (address) requested by the host, routers that operate the same multicast protocol according to the multicast routing protocol operation are assigned a multicast routing table ( You will have a separate multicast routing table. In this case, multicast packets sent by a specific multicast server of the Internet network are received by the GGSN 218 by multi routing.

The ATM switch 316 of the GGSN 218 monitors whether packet data is received from the Internet in step 610 of FIG. 6. The ATM switch 316 proceeds to step 612 when receiving the packet data from the Internet network in step 610. The ATM switch 316 buffers the received packet data in step 612, and analyzes the packet service of the received packet data in step 614. The packet service can be analyzed by checking the multicast IP from the IP header of the received packet data. When the analysis of the packet service by the multicast IP is completed in step 614, the ATM switch 316 proceeds to step 616 to determine whether a connection corresponding to the analyzed multicast IP is established. Whether or not to establish the connection is possible by searching a forwarding table. That is, it is searched whether SGSN IP and TEID according to connection establishment are registered corresponding to the multicast IP registered in the forwarding table. The SGSN IP is an identifier for identifying the SGSN to which the host to provide the packet service belongs, and the TEID is an identifier for identifying a connection for transmitting the packet data as described above. An example of the forwarding table is as shown in Table 2 below.

multicast IP host IP SGSN IP TEID 224.0.0.10 1.1.1.1 1.1.3.1 100 1.1.1.5 1.1.4.1 101 1.1.1.7 1.1.6.1 102

In Table 2, a packet service corresponding to the multicast IP "224.0.0.10" is received by three hosts having "1.1.1.1", "1.1.1.5", and "1.1.1.7" as host IPs. An example of multi-transmitting data is shown.

If it is determined in step 616 that the connection is established, the ATM switch 316 proceeds to step 624 and transmits the buffered packet data to the corresponding SGSN 212 through the established connections. That is, according to Table 2, the received packet data is used to provide the received packet data to hosts having "1.1.1.1", "1.1.1.5", and "1.1.1.7" as host IP, respectively. It transmits to the SGSNs corresponding to the predetermined SGSN IPs ("1.1.3.1", "1.1.4.1", "1.1.6.1") through the connection set to the predetermined TEID (100, 101, 102). At this time, the IP header of the transmitted packet data includes the multicast IP, the host IP and the SGSN IP, and the GTP header includes the TEID.

However, if it is determined in step 616 that the connection is not established, the ATM switch 316 proceeds to step 618. In step 618, the ATM switch 316 reads host IPs stored in the multicast join table corresponding to the multicast IP. In addition, the MIP 314, which is an upper processor, requests to establish a connection to the hosts corresponding to the read host IP. The MIP 314 receiving the connection establishment request from the ATM switch 316 establishes a connection to the hosts using the GTP protocol. In this case, the process performed by the MIP 314 to establish a connection is performed by a typical network initiated context setup, which will be omitted as described in detail with reference to FIG. 1. The MIP 314 notifies the ATM switch 316 of the completion of the connection establishment for all hosts that will provide the multi-transmission service. In the notification, the SGSN IP and the TEID according to the connection setting are provided together. The SGSN IP and the TEID are determined to be unique for each of the hosts to which the connection is established.

The ATM switch 316 monitors whether the connection to the plurality of hosts is completed by the MIP 314 in step 620. Completion of the connection establishment can be detected by the provision of the SGSN IP and TEID from the MIP (314). If the ATM switch 316 detects that connection establishment is completed in step 620, the ATM switch 316 proceeds to step 622 and registers the established connection in the forwarding table. That is, the ATM switch 316 registers the SGSN IP and the TEID provided from the MIP 314 corresponding to the corresponding host IP. That is, the SGSN IP and the TEID according to the connection establishment are stored corresponding to each of the hosts requesting the connection establishment. Referring to the forwarding table shown in Table 2, it can be seen that the SGSN IP of "1.1.3.1" and the TEID of "100" are set for the host IP "1.1.1.1". In addition, SGSN IP of "1.1.4.1" and TEID of "101" are set for the host IP "1.1.1.5", and SGSN IP of "1.1.6.1" and "102" for the host IP "1.1.1.7". It can be seen that the TEID of is set. When the registration of the connection established by the above process is completed, the ATM switch 316 proceeds to step 624 to multi-transmit the buffered packet data through the established connections.

As can be seen from the above-described operation according to an embodiment of the present invention, it can be seen that buffering of packet data through connection establishment to a plurality of hosts is performed only for the packet data initially received corresponding to the requested packet service. . That is, packet data received after connection establishment is buffered by a plurality of SGSN IPs and a plurality of TEIDs registered in a forwarding table without a process for establishing a connection. The multi-transmission operation has been described above, and the transmitted packet data may be received by all hosts although there may be a slight time difference.

As described above, the present invention can provide various services to a host by providing a multi-transmission packet service that transmits the same packet data to a plurality of hosts, and in the mobile communication network, the same packet service can be efficiently provided to a plurality of hosts. There is an effect that can be provided.

Claims (6)

delete delete delete Forwarding for registering a multicast Internet protocol address corresponding to one packet service, an Internet protocol address corresponding to a plurality of hosts for providing the packet service, an SGSN internet protocol address, and a path identifier connecting the SGSN and the wireless network controller. In the method of multi-transmitting the packet data for the same packet service request from a plurality of hosts in the GGSN of the mobile communication system having a table, Registering addresses of the plurality of hosts requesting the same packet service and the requested packet service in a multicast combining table, and requesting the packet service to an external network; Receiving packet data from the external network and analyzing a corresponding packet service based on header information of the received packet data; Determining whether connections to a plurality of hosts requesting the analyzed packet service are established by searching the forwarding table; Transmitting the received packet data through the connections registered in the forwarding table when the connections to the plurality of hosts requesting the analyzed packet service are established; If the connection to the plurality of hosts requesting the analyzed packet service is not established, the addresses of the hosts registered corresponding to the analyzed packet service are read from the multicast combining table, and the addresses are read. Requesting the connection setup by the upper processor, When a connection to each of the read addresses is established by the upper processor, the connection setting result is received from the upper processor to update the forwarding table, and the received packet data is updated through the updated connections to the forward table. The method comprising the step of transmitting. The method of claim 4, wherein The external network is characterized in that the Internet network. delete