JP3778483B2 - Data communication method in mobile communication - Google Patents

Description

[0001]
[Industrial application fields]
The present invention particularly relates to a data communication method of a communication system, and more particularly to a data communication method in mobile communication improved so that radio resources can be used effectively.
[0002]
[Prior art]
Conventionally, when TCP / IP communication is performed by connecting local area networks (LANs) with routers, or a dial-up connection in which a provider connects to the Internet via a telephone line via a modem by a personal computer, for example, Point-to-point protocol (PPP) is used as a data link layer protocol. The PPP is a communication protocol used for one-to-one communication between two points, generally to communication by the sequence shown in FIG. 6 is performed. That is, in the data communication sequence between the data terminal equipment (DTE) and the data circuit terminating equipment (DCE), a configuration request is transmitted from one device side, and the configuration from the other device side in response to the request is transmitted. A link link based on a link control protocol (LCP) in which an authentication request for an identification number or a password is transmitted from the data terminal device side and an authentication response is received from the other data circuit terminating device side in response to the request. IPCP establishment is performed by performing an IPCP operation for performing an operation and authentication, and subsequently transmitting an Internet Control Protocol (IPCP) configuration request and receiving an IPCP configuration response to the request. As a result, packet communication becomes possible and transmission of the IP datagram is performed. When the transmission is completed, a termination request is transmitted from the data terminal device side, and a PPP link termination for receiving a termination response from the data line termination device in response to this request is performed.
[0003]
[Problems to be solved by the invention]
The above PPP is complicated so that it can be used in various environments, and when it is used for data communication in a mobile communication network such as a cellular phone, there is a lot of overhead in operation and an extra signal Since the radio resources are considerably limited, it is not suitable for use as it is.
[0004]
The present invention has been made in view of the above circumstances, and an object thereof is to provide a data communication method capable of effectively using radio resources suitable for a mobile communication network.
[0005]
[Means for Solving the Problems]
In the invention described in claim 1 in order to achieve the above object, in a data communication method in a mobile communication that performs packet communication by the mobile data communications system including a mobile station and mobile packet exchange, the mobile Transmitting a request for starting a packet communication mode from a mobile station to the mobile packet switch including a protocol identifier and a compression method; and from the mobile packet switch receiving the request for starting the packet communication mode, A step of transmitting to the mobile device a response for starting the packet communication mode including the mobile device IP address used by the mobile device, and performing authentication between the mobile device and the mobile packet switch and wherein data communication by transmission of IP datagrams after setting a logical link between the two points Is shall. Negotiations for general PPP link establishment and authentication are not required, and transmission / reception of a PPP end signal is not required, so that limited radio resources can be effectively used with less overhead.
[0006]
In the invention described in claim 2, in a data communication method in a mobile communications that performs data communication by the mobile data communications system including a mobile station and a large-capacity data transfer system, the mass data with the mobile station A step of performing authentication with the transfer system and connecting a wireless line, and transmitting a request for starting a data communication link from the mobile unit to the large-capacity data transfer system including a protocol identifier and a compression method And a mobile data IP address used by the mobile device in a response for starting the data communication link from the large-capacity data transfer system that has received the request for starting the data communication link to the mobile device Data communication by transmitting IP datagrams after establishing a logical link between the two points It is characterized in that to perform. Negotiations for general PPP link establishment and authentication are not required, and transmission / reception of a PPP end signal is not required, so that limited radio resources can be effectively used with less overhead.
[0007]
The invention according to claim 3 is characterized in that the logical link is released when the packet communication mode is canceled or the no-communication state on the PPP link continues for a certain period of time. is there. There is no need for explicit PPP link establishment and authentication.
[0008]
The invention according to claim 4 is characterized in that the logical link is released when the non-communication state on the data communication link continues for a certain period of time . There is no need for explicit PPP link establishment and authentication.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described in detail with reference to an illustrated embodiment. 1 to 4 are diagrams for explaining a data communication method in mobile communication according to an embodiment of the present invention. FIG. 1 is a diagram for explaining a sequence of data communication between a mobile device and a mobile packet switch. FIG. FIG. 3 is a diagram illustrating a network configuration, FIG. 3 is a diagram illustrating a message configuration of a request for starting a packet communication mode, and FIG. 4 is a diagram illustrating a message configuration of a response for starting a packet communication mode.
[0010]
In these drawings, the mobile communication network of the present embodiment includes a first mobile data communication system 10 and a second mobile data communication system 20 connected to an IP backbone network system 30, and this IP backbone network system. 30 is connected to the Internet 50 via the gateway 40 and is configured to allow mobile data communication.
[0011]
The first mobile data communication system 10 is a mobile station (MS: Mobile Station).
11, a base station (BS) 12, a circuit switching mobile switching center (MSC) 13 and a mobile packet switching center (PMSC) 14. . The second mobile data communication system 20 includes a mobile station (MS) 21, a base station (BS) 22, a circuit switching mobile switching center (MSC) 23, and a large-capacity data transfer system 24. It is configured. The large-capacity data transfer system 24 is a system capable of transferring large-capacity data. For example, the large-capacity data transfer system 24 includes a data communication unit 24a having an access server 24b constituting a data circuit terminating device. A portion for performing processing for transmitting and receiving data, a portion for performing processing for transmitting and receiving data between the mobile device 21 and the host system, a portion for performing data protocol conversion, and the like.
[0012]
The IP backbone network system 30 is configured by a LAN and provided with a router 31, each of which includes a mobile packet switch 14 connected to the router 31, a large capacity transfer system 24 connected to the router 31, and a gateway 40. Connected to the Internet 50. This gateway 40 is arranged between the IP backbone network system 30 and the Internet 50, and receives messages from one network, stores them if necessary, and converts the protocol in order to ensure consistency of connection between different networks. This is the part that transmits to the other network.
[0013]
Next, when packet communication is performed between the mobile station 11 of the first mobile data communication system 10 configured as described above and the Internet 50 using TCP / IP, the mobile station 11 and the mobile packet switch 14 are connected. A communication sequence between points will be specifically described.
[0014]
As shown in FIG. 1, first, as a link establishment and start phase for starting packet communication, a request for starting the packet communication mode is transmitted from the mobile station 11 to the mobile packet switch 14. The request for starting the packet communication mode is set including a protocol identifier for setting a network control protocol (NCP) for setting a link for a specific network layer protocol and a compression method. As the protocol identifier, for example, an identifier that designates the Internet Protocol Control Protocol (IPCP) is set, but a protocol other than the Internet Protocol (IP) can be used for future extensibility. As the compression method, for example, VJ (Van Jacobson) compression that compresses an IP header that is an Internet protocol header and a TCP header that is a transmission control protocol (TCP) header is set. The request for starting the packet communication mode is, for example, UPCH (from the mobile station 11 stipulated in the PDC digital car phone system (RCR-27H version radio wave industry)) sent to the network side. User packet channel) packet communication registration request message structure is used. As shown in FIG. 3, the message configuration of the packet communication registration request includes a message type indicating a message type number, and a retransmission identifier which is information for determining whether or not the received signal is a signal to be received. , Mobile station type for notifying the type of mobile device, ..., operator-specific information that can be freely defined for each telecommunications carrier, packet connection method for notifying the network of packet connection methods that the mobile device can communicate with, etc. Each information element has an information length. Then, the above protocol identifier, compression method, and the like are set using the operator-specific information having an information length of 1 to 128 octets as the request setting area for starting the packet communication mode. Next, the mobile packet switch 14 that has received the request for starting the packet communication mode transmits a response for starting the packet communication mode to the mobile device 11. The response for activation of this packet communication mode includes a W. responsive to the mobile station number such as the mobile telephone subscriber number (MSN) of the mobile station 11. X. Y. An IP address of a mobile device such as Z is assigned. As the response for starting the packet communication mode, for example, the message configuration of the UPCH packet communication registration response sent from the network side to the mobile station 11 side is used. As shown in FIG. 4, the message structure of this packet communication registration response is to notify the mobile device of the same message type, retransmission identifier, transmission speed such as a transmission speed for communication,..., Operator specific information, and packet connection conditions. The information length is determined for each information element such as a packet connection condition. Then, the operator-specific information whose information length of the packet communication registration response is 1 to 128 octets is used as a response setting area for starting the packet communication mode, and the protocol identifier, the optional parameters such as the compression method, and the above-mentioned mobile station IP address Is set. Through the above steps, a logical link capable of packet communication is set between two points of the mobile station 11 and the mobile packet switch 14. Subsequently, data communication is performed by transmitting an IP datagram using the mobile device IP address assigned from the mobile packet switch 14.
[0015]
Next, as a packet communication end phase, a request for canceling the packet communication mode is transmitted from the mobile station 11 to the mobile packet switch 14, and the mobile packet switch 14 that has received the request for canceling the packet communication mode is received. Transmits a response for canceling the packet communication mode to the mobile station 11 or the non-communication state on the PPP link continues for a certain period of time, so that the logical connection between the mobile station 11 and the mobile packet switch 14 is established. Data communication is terminated as if the link was released. That is, as shown in the request and response for canceling the packet communication mode in FIG. 1, the cancellation of the packet communication mode by transmitting and receiving these signals can also serve as the PPP link termination procedure. However, these signals cannot be transmitted / received in a situation where the mobile station 11 cannot be wirelessly accessed, but the PPP link can be released when the no-communication monitoring timer expires.
[0016]
In the data communication method by the first mobile data communication system 10 having the above-described configuration, when packet communication is performed using TCP / IP, a logical connection is made between both points of the mobile device 11 and the mobile packet switch 14. In order to establish and start a secure link, a request for starting a packet communication mode including a protocol identifier, a compression method, and the like is transmitted from the mobile station 11 to the mobile packet switch 14 to start the packet communication mode. In response to the request, the mobile packet switch 14 sends a response to the mobile device 11 for starting the packet communication mode including the protocol identifier, the optional parameters such as the compression method, and the assigned mobile device IP address. Send. Since authentication is performed in the step of starting the packet communication mode, negotiation for establishing and authenticating a PPP link based on a general PPP data link layer link control protocol (LCP) becomes unnecessary, and By canceling the packet communication mode or by maintaining the no-communication state on the PPP link for a certain period, the logical link is released, so that it is not necessary to send a PPP link end signal and reduce overhead. The limited radio resources can be effectively used, and a data communication method suitable for mobile communication can be provided.
[0017]
Next, in FIG. 2, a second mobile data communication system 20 that can realize a pseudo packet communication method that is based on a circuit switching system but multiplexes data communication links of a plurality of mobile stations on one line is shown. Is provided. In the second mobile data communication system 20, when data communication is performed between the mobile device 21 and the Internet 30 using TCP / IP, the mobile device 21 and the mobile device 21 are largely connected by the sequence shown in FIG. A logical link is set between both points with the access server 24b constituting the data circuit terminating device of the capacity data transfer system 24. That is, after the wireless line is connected, a request for starting the data communication link is transmitted from the mobile station 21 to the large-capacity data transfer system 24 as a phase for establishing and starting a link for starting packet communication. The request for starting the data communication link is set including the same protocol identifier as described above and the compression method. The request for starting the data communication link is transmitted from the mobile station 21 stipulated in the PDC digital mobile phone system to the network side using a previously established wireless line, for example. Is done. Next, the large-capacity data transfer system 24 that has received the request for starting the data communication link transmits a response for starting the data communication link to the mobile device 21. The response for starting the data communication link is assigned a mobile station IP address corresponding to a mobile telephone subscriber number (MSN) and optional parameters such as a protocol identifier and a compression method. The response for starting the data communication link is similarly sent from the network side to the mobile device 21 side using a previously established wireless line. Through the above steps, a logical link capable of data communication is set between two points of the mobile device 21 and the large capacity data transfer system 24. Subsequently, data communication is performed by transmitting an IP datagram using the mobile device IP address assigned from the large-capacity data transfer system 24.
[0018]
Next, as a data communication end phase, in addition to the release of the logical link using the normal LCP PPP link end procedure, the non-communication state on the data communication link continues for a certain period of time. Data communication is terminated assuming that the logical link with the capacity data transfer system 24 has been released.
[0019]
In the data communication method using the second mobile data communication system 20 having the above-described configuration, when data communication is performed using TCP / IP, a logical operation is performed between both points of the mobile device 21 and the large-capacity data transfer system 24. In order to establish and start a general link, after a wireless line is connected, a request for starting a data communication link including a protocol identifier, a compression method, etc. is transmitted from the mobile station 21 to the large-capacity data transfer system 24. In response to the request for starting the data communication link, the large-capacity data transfer system 24 sends a response for starting the data communication link including the assigned mobile device IP address to the mobile device 21. Send to. Since the authentication process is completed when the wireless line is connected, it is not necessary to negotiate for PPP link establishment and authentication based on the link control protocol (LCP) of the general PPP data link layer. In addition to the release of the logical link using the PPP link termination procedure by the LCP, the logical link can be released when the non-communication state on the data communication link continues for a certain period. It is not necessary to send or receive a link end signal, and similarly, it is possible to effectively use limited radio resources by reducing overhead, thereby providing a data communication method suitable for mobile communication.
[0020]
In the above-described embodiment, an example in which both the first mobile data communication system 10 and the second mobile data communication system 20 are provided has been described. However, packet communication is possible with only one system. Also, it will be readily understood that the invention is not limited to the specific embodiments disclosed, but may be varied within the spirit and scope of the invention as defined by the claims.
[0021]
【The invention's effect】
As described above, according to the present invention, in the packet switching method, a request for starting the packet communication mode is transmitted from the mobile unit to the mobile packet switching unit in order to establish and start a logical link. In response to the request for starting the packet communication mode, the mobile packet switch transmits a response for starting the packet communication mode to the mobile device, and then performs packet communication to terminate the packet communication. Based on the link control protocol (LCP) of the general PPP data link layer by releasing the logical mode by releasing the communication mode or continuing the no communication state on the PPP link for a certain period of time. Negotiation for PPP link establishment and authentication is not required, and sending and receiving of the PPP link end signal is not required. It is possible to effectively utilize the least to limited radio resources to.
[0022]
Further, according to the present invention, in the circuit switching method, a request for starting a data communication link is sent from the mobile device to the large-capacity data transfer system after connecting a wireless line in order to establish and start a logical link. In response to this, the mass data transfer system transmits a response for starting the data communication link to the mobile device, and then performs data communication. In addition, since the logical link is released when the non-communication state on the data communication link continues for a certain period of time, the PPP link establishment and authentication negotiation are similarly unnecessary, and the PPP link It is not necessary to send and receive the end signal, and it is possible to effectively use limited radio resources with less overhead.
[Brief description of the drawings]
FIG. 1 is a diagram illustrating a sequence of a data communication method between points for a mobile device according to an embodiment of the present invention.
FIG. 2 is a diagram illustrating the configuration of a communication network according to an embodiment of the present invention.
FIG. 3 is a diagram illustrating a message configuration of a request for starting a packet communication mode in the data communication method according to the embodiment of the present invention.
FIG. 4 is a diagram illustrating a message configuration of a response for starting a packet communication mode in the data communication method according to the embodiment of the present invention.
FIG. 5 is a diagram illustrating a sequence of a data communication method between points for a mobile device according to an embodiment of the present invention.
FIG. 6 is a diagram illustrating a sequence according to a conventional point-to-point protocol.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 1st mobile data communication system 11 Mobile station 12 Base station 13 Mobile switch 14 Mobile packet switch 20 Second mobile data communication system 21 Mobile station 22 Base station 23 Mobile switch 24 Mass data transfer system 24a Data communication unit 24b Access server 30 IP backbone network system 31 Router 40 Gateway 50 Internet

Claims (4)

In a data communication method for mobile communication in which packet communication is performed by a mobile data communication system including a mobile device and a mobile packet switch, a protocol identifier is sent to the request for starting a packet communication mode from the mobile device to the mobile packet switch. The mobile unit uses the response to start the packet communication mode from the mobile packet switch that has received the request for starting the packet communication mode to the mobile unit. Data including the IP address of the mobile device after performing the step of transmitting including the IP address of the mobile device, authenticating between the mobile device and the packet switch for the mobile device, and setting up a logical link between the two points. A data communication method in mobile communication characterized by performing communication. In a data communication method in mobile communication in which data communication is performed by a mobile data communication system including a mobile device and a large capacity data transfer system, authentication is performed between the mobile device and the large capacity data transfer system, and a wireless line Transmitting a request for starting a data communication link from the mobile unit to the large-capacity data transfer system including a protocol identifier and a compression method, and for starting the data communication link And a step of transmitting a request including a mobile unit IP address used by the mobile unit to a response for starting a data communication link from the large-capacity data transfer system that has received the request to the mobile unit. mobile communication and performs data communication by transmission of IP datagrams after setting a link Definitive data communication method. 2. The data communication method in mobile communication according to claim 1, wherein the logical link is released when the packet communication mode is canceled or the non-communication state on the PPP link continues for a certain period. . 3. The data communication method in mobile communication according to claim 2, wherein a logical link is released when a no-communication state on the data communication link continues for a certain period .

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