Service management method and connection oriented network system using such management method

• US 6,101,542 A
• Filed: 07/16/1997
• Issued: 08/08/2000
• Est. Priority Date: 07/19/1996
• Status: Expired due to Fees

• Current Assignee: Hitachi, Ltd.
• Original Assignee: Hitachi, Ltd.
• Inventors: Sawada, Sunao, Miyamoto, Takahisa, Tominaga, Yoshikazu
• Primary Examiner(s): Asta, Frank J.
• Assistant Examiner(s): VU, THONG H
• Application Number:
  US08/895,366
• Time in Patent Office: 1,119 Days
• Field of Search: 370/397, 370/392, 370/395, 370/60.1, 370/84, 370/218, 370/232, 370/458, 370/399, 395/500, 395/856, 395/417, 395/828, 709/200, 709/153, 709/227, 709/223, 709/229, 709/238, 709/213, 709/230, 707/7, 714/4
• US Class Current: 709/227
• CPC Class Codes: G06F 13/14 Handling requests for interconnection or transfer
• CPC Class Codes: H04L 67/14 Session management for real-time applications in data packet communications networks H04L65/1066
• CPC Class Codes: H04L 69/329 in the application layer [OSI layer 7]

Abstract

For a connection-oriented network system in which information terminals such as PC and WS are connected to a network such as LAN and WAN and a logical connection is established if necessary to a terminal to transfer data over the established connection, a service management method is provided which allows data transfer without connection management by a service application. A communication driver for data transfer is provided with a connection processing unit for establishing a connection to a transmission destination terminal and a connection queue for temporarily storing transmission data during a connection process. If a connection is still not established between terminals for data transmission, the connection processing unit stores the transmission data supplied from a service application in the connection queue, establishes a connection to the transmission destination terminal designated by the service application, and thereafter dequeues the transmission data from the connection queue to transmit the transmission data over the established connection.

Claims

1. A service management method for a connection oriented network system in which terminals are connected to a network and a logical connection is established between terminals, as required to transfer data over the established connection, said method comprising the steps of:

preparing a connection processing unit, a connection management table and a connection queue at a communication driver of a transmission originating terminal including at least one service application from which data is transmitted to a transmission destination terminal, said connection management table managing a correspondence between a transmission address and a connection number, said transmission address being used by said service application to identify the transmission destination terminal, and said connection number being assigned by a switch interconnecting terminals for allowing said communication driver and said switch to discriminate between connections, said connection processing unit establishing a connection to the transmission destination terminal, and said connection queue temporarily storing transmission data during a connection process;

said connection processing unit registering a transmission address and a corresponding connection number in said connection management table during a connection process;

when a data transmission request is made to said communication driver by a service application, said communication driver referring to said connection management table, acquiring a connection number in accordance with a transmission address designated by said service application and transmitting transmission data from said service application over a connection identified by said acquired connection number; and

if a connection is not established between said transmission originating terminal and said transmission destination terminal for data transmission, said connection processing unit loading said transmission data supplied from said service application of said transmission originating terminal in said connection queue, establishing a connection to said transmission destination terminal designated by said service application, and after establishing the connection, dequeuing said transmission data from said connection queue; and

said communication driver transferring said dequeued transmission data over said established connection.

2. A service management method according to claim 1, wherein said connection management table is adapted to manage a plurality of sets of a correspondence among a transmission address, a connection number and a service type, said service type identifying the type of a service application, wherein said connection processing unit registers one or more sets of a connection number, a transmission address designated by a service application and a corresponding service type of said service application in association with each other in said connection management table during a connection process;

and

said connection processing unit establishes one or more connections having the registered connection numbers to terminals for each service application, and transmits transmission data over said established connections.

3. A service management method according to claim 1, wherein said connection management table at said communication driver is adapted to manage a plurality of sets of a service type for identifying a type of a service application, a corresponding reception interface identifier containing a reception function address of said service application and a corresponding connection number in association with each other, wherein said connection processing unit registers one or more sets of a service type, a corresponding reception interface identifier of a service application and a corresponding connection number in association with each other in said connection management table curing a connection process;

and

during data reception, said communication driver refers to said connection management table, and determines a service application and a reception interface to which reception data is supplied, in accordance with the connection number assigned to the reception data, to thereby allow one or more service applications to be implemented on said transmission destination terminal without analysis of the reception data each time the reception data is received.

4. A service management method according to claim 3, wherein if a new service application is added, the service type of said new service application and the reception interface identifier are registered in said connection management table and said connection processing unit registers during the connection process the connection number in said connection management table, to thereby allow said communication driver to transfer the reception data to said new service application without changing said communication driver so as to compatible with said new service application.

5. A service management method according to claim 1, wherein:

said connection processing unit reads the service type contained in a connection request from a terminal and registers the read service type in said connection management table; and

if a new connection request is received from a terminal still not establishing a connection, said connection processing unit registers the service type and the connection number designated by said new connection request in said connection management table, to thereby enable data transfer upon reception of a connection request from an optional terminal.

6. A service management method according to claim 5, wherein:

if a new connection request to a service application is received from a terminal already establishing a connection to the same service application, said connection processing unit renews the connection number in said connection management table corresponding to the service type designated by said new connection request from the terminal, to thereby enable data transfer over the changed connection even if the connection number of the terminal already establishing the connection is changed.

7. A service management method according to claim 5, wherein:

if a new connection request to a new service application is received from a terminal already establishing a connection, said connection processing unit registers the service type and the connection number designated by said new connection request from the terminal in said connection management table, to thereby establish a plurality of connections to terminals and enable data transfer over the established connections.

8. A service management method according to claim 1, wherein said terminal includes at least one of a personal computer and a workstation.

9. A service management method according to claim 1, wherein said network is a LAN.

10. A service management method according to claim 1, wherein said network is a WAN.

11. A service management method for a network system interconnecting terminals via a network, said method comprising the steps of:

preparing a connection management table at a communication driver of a transmission originating terminal, said communication driver being used for data transfer, and said connection management table managing a correspondence between a transfer rate and a transmission address used by a service application for identification of a transmission destination terminal;

registering a transmission address and a transfer rate in said connection management table during an initialization process;

when a data transfer request is made from a service application, said communication driver referring to said connection management table for data transmission and acquiring said transfer rate in accordance with the transmission address designated by said service application; and

transmitting transmission date at said acquired transmission rate, to thereby enable data transfer between terminals at an optional transfer rate.

12. A service management method according to claim 11, wherein it is checked whether communications between terminals are possible at said transfer rate registered in said connection management table to thereby enable data transfer at a proper transfer rate.

13. A service management method for a network system interconnecting terminals via a network, said method comprising the steps of:

preparing a connection management table at a communication driver of a transmission originating terminal, said communication driver being used for data transfer, and said communication management table managing a correspondence between a service discriminating between service applications and a transfer rate;

registering a service type and a transfer rate in said connection management table during an initialization process;

when a data transmission request is made from a service application, said communication driver referring to said connection management table for data transmission and acquiring the transfer rate in accordance with the service type designated by said service application; and

transmitting data at said acquired transfer rate, to thereby enable data transmission between service applications at an optional transfer rate.

14. A service management method according to claim 13, wherein it is checked whether communications are possible at said transfer rate registered in said connection management table to thereby enable data transfer at a proper transfer rate.

15. A service management method for a connection oriented network system in which terminals are connected to a network and a logical connection is established between terminals, as required to transfer data over the established connection, said method comprising the steps of:

preparing a connection processing unit, a connection management table and a connection queue at a communication driver of a transmission originating terminal including at least one service application from which data is transmitted to a transmission destination terminal, said connection management table managing a correspondence among a transmission address, a connection number, a service type and a transfer rate, said transmission address being used by said service application to identify the transmission destination terminal, and said connection number being assigned by a switch interconnecting terminals for discrimination between connections by said communication driver and said switch, said connection processing unit establishing a connection to the transmission destination terminal, and connection queue temporarily storing transmission data during a connection process;

said connection processing unit registering a transmission address and a corresponding connection number in said connection management table during a connection process;

registering during an initialization process the transmission address end the transfer rate in said connection management table;

when a data transmission request is made from a service application, said communication driver referring to said connection management table, acquiring a connection number and a transfer rate in accordance with a transmission address designated by said service application and transmitting transmission data from said service application over a connection identified by said acquired connection number at the acquired transfer rate; and

if a connection is not still established between said communication driver and said transmission destination terminal for data transmission, said connection processing unit loading said transmission data supplied from said service application in said connection queue, establishing a connection to said transmission destination terminal designated by said service application in accordance with said transfer rate registered in said connection management table, and after establishing the connection, dequeuing said transmission data from said connection queue; and

said communication driver transferring said dequeued transmission data over said established connection at said transfer rate.

16. A service management method according to claim 15, wherein said step of establishing a connection includes a step of said connection processing unit sending a connection request to said transmission destination terminal, wherein the connection processing unit of said transmission destination terminal receiving said connection request judges whether communications are possible at the transfer rate designated by said connection request, and if not, sends back a connection response by changing the transfer rate to another transfer rate, and said connection processing unit of said transmission originating terminal received said connection response renews the value of the transfer rate stored in said connection management table to perform data transfer at said renewed transfer rate.

17. A service management method according to claim 16, further comprising the steps of:

a higher level service application issuing a data transmission request by sending the transmission data containing the transmission address and the transfer rate to said communication driver;

if a connection is not established between said communication driver and said communication destination terminal for data transfer, said connection processing unit loading said transmission data supplied from said higher level service application in said connection queue, establishing a connection in accordance with said transmission address and said transfer rate contained in said transmission data supplied from said higher level service application, and thereafter dequeuing said transmission data from said connection queue; and

said communication driver transferring said transmission data over said established connection at said transfer rate.

18. A service management method according to claim 16, further comprising the steps of:

preparing a priority degree/transfer rate conversion table at said communication driver, said conversion table storing a priority degree and a corresponding transfer rate;

a higher level service application issuing a data transmission request by sending the transmission data containing the transmission address and the priority degree to said communication driver;

if a connection is not established between said communication driver and said communication destination terminal for data transfer, said connection processing unit loading said transmission data supplied from said higher level service application in said connection queue, referring to said priority degree/transfer rate conversion table to acquire the transfer rate by using as a search key the priority degree contained in said transmission data supplied from said higher level service application, establishing a connection in accordance with said acquired transfer rate and said transmission address contained in said transmission data, and thereafter, dequeuing said transmission data from said connection queue; and

said communication driver transferring said transmission data over said established connection at said transfer rate.

19. A service management method according to claim 15, further comprising the steps of:

a higher level service application issuing a data transmission request by sending the transmission data containing the transmission address and the transfer rate to said communication driver;

if a connection is not established between said communication driver and said communication destination terminal for data transfer, said connection processing unit loading said transmission data supplied from said higher level service application in said connection queue, establishing a connection in accordance with said transmission address and said transfer rate contained in said transmission data supplied from said higher level service application, and thereafter dequeuing said transmission data from said connection queue; and

said communication driver transferring said transmission data over said established connection at said transfer rate.

20. A service management method according to claim 15, further comprising the steps of:

preparing a priority degree/transfer rate conversion table at said communication driver, said conversion table storing a priority degree and a corresponding transfer rate;

a higher level service application issuing a data transmission request by sending the transmission data containing the transmission address and the priority degree to said communication driver;

if a connection is not established between said communication driver and said communication destination terminal for data transfer, said connection processing unit loading said transmission data supplied from said higher level service application in said connection queue, referring to said priority degree/transfer rate conversion table to acquire the transfer rate by using as a search key the priority degree contained in said transmission data supplied from said higher level service application, establishing a connection in accordance with said acquired transfer rate and said transmission address contained in said transmission data, and thereafter, dequeuing said transmission data from said connection queue; and

said communication driver transferring said transmission data over said established connection at said transfer rate.

21. A connection-oriented network system, comprising:

a plurality of terminals;

a switch; and

a line for connecting each of said plurality of terminals to said switch;

wherein;

each of said plurality of terminals includes a communication driver,

the communication driver of a transmission originating terminal from which data is transmitted includes a connection processing unit for establishing a connection to a transmission destination terminal, a connection management table and a connection queue for temporarily storing data during a connection process,

said connection management table manages a correspondence between a transmission address and a connection number, said transmission address being used by said service application to identify the transmission destination terminal, and said connection number being assigned by a switch interconnecting terminals for allowing said communication driver and said switch to discriminate between connections, said connection processing unit establishes a connection to the transmission destination terminal, and said connection queue temporarily stores transmission data during a connection process, and

said connection processing unit registers a transmission address and a corresponding connection number in said connection management table during a connection process, wherein further;

when a data transmission request is made to said communication driver by a service application, said communication driver referring to said connection management table, acquires a connection number in accordance with a transmission address designated by said service application and transmits transmission data from said service application over a connection identified by said acquired connection number,

if a connection is not established between said transmission originating terminal and said transmission destination terminal for data transmission, said connection processing unit loads said transmission data supplied from said service application of said transmission originating terminal in said connection queue, establishes a connection to said transmission destination terminal designated by said service application, and after establishing the connection, dequeues said transmission data from said connection queue, and

said communication driver transfers said dequeued transmission data over said established connection.

22. A network system according to claim 21, wherein said communication driver includes a connection management table for managing a correspondence between a transmission address used for identification of said transmission destination terminal by said service application, a service type discriminating between service applications and a connection number assigned by said switch for discrimination between connections by said communication driver and said switch.

23. A network system according to claim 21, wherein said communication driver includes a connection management table for managing a correspondence between a service type discriminating between service applications, a reception interface identifier such as a reception function address of each service application and a connection number assigned by said switch for discrimination between connections by said communication driver and said switch.

24. A connection-oriented network system, comprising:

a plurality of terminals;

a switch; and

a line for connecting each of said plurality of terminals to said switch, wherein;

each of said plurality of terminals includes a communication driver;

the communication driver of a transmission originating terminal from which data is transmitted includes a connection management table for managing a correspondence between a transfer rate and a transmission address used for identification of said transmission originating terminal by a service application, said transmission address and said transfer rate being registered in said connection management table during an initialization process;

when a data transfer request is made from a service application, said communication driver of said transmission originating terminal refers to said connection management table to acquire the transfer rate for data transmission in accordance with said transmission address designated by said service application, and transmits transmission data an optional transfer rate.

25. A connection-oriented network system, comprising:

a plurality of terminals;

a switch; and

a line for connecting each of said plurality of terminals to said switch, wherein;

each of said plurality of terminals includes a communication driver,

the communication driver of a transmission originating terminal from which data is transmitted includes a connection management table for managing a correspondence between a transfer rate and a service type for discrimination between service applications, said service type and said transfer rate being registered in said connection management table during an initialization process, and

when a data transmission request is made from a service application, said communication driver of said transmission originating terminal refers to said connection management table to acquire the transfer rate for data transmission in accordance with said service type designated by said service application, and transmits transmission data at said acquired transfer rate to thereby enable data transmission between service applications at an optional transfer rate.

26. A connection-oriented network system, comprising:

a plurality of terminals;

a switch; and

a line for connecting each of said plurality of terminals to said switch, wherein;

each of said plurality of terminals includes a communication driver, and

the communication driver of a transmission originating terminal from which data is transmitted includes;

a connection processing unit,

a connection queue, and

a connection management table said connection processing unit establishing a connection to a transmission destination terminal, wherein

said connection queue temporarily stores transmission data during a connection process, and said connection management table manages a correspondence between a connection number, a transmission address, a service type and a transfer rate, said connection number being assigned by said switch for discrimination between connections by said communication driver and said switch, said transmission address being used for discrimination between transmission destination terminals, and said service type being used for discriminating between service applications,

when a data transmission request is made from a service application, said communication driver refers to said connection management table, acquires a connection number and a transfer rate in accordance with a transmission address designated by said service application and transmits transmission data from said service application over a connection identified by said acquired connection number at the acquired transfer rate,

if a connection is not still established between said communication driver and said transmission destination terminal for data transmission, said connection processing unit loads said transmission data supplied from a service application in said connection queue, establishes a connection to said transmission destination terminal designated by said service application in accordance with said transfer rate registered in said connection management table, and thereafter dequeues the transmission data from said connection queue, and

said communication driver transfers said dequeued transmission data over said established connection at said transfer rate.

27. A connection-oriented network system according to claim 26, wherein said communication driver includes a priority degree/transfer rate conversion table for storing a priority degree and a corresponding transfer rate, and wherein further:

if a connection is not established between said communication driver and said communication destination terminal for data transfer, said connection processing unit load said transmission data supplied from a higher level service application in said connection queue, refers to said priority degree/transfer rate conversion table to acquire the transfer rate by using as a search key the priority degree contained in said transmission data supplied from said higher level service application, establishes a connection in accordance with said acquired transfer rate and said transmission address contained in said transmission data, and thereafter, dequeuing said transmission data from said connection queue; and

said communication driver transfers said transmission data over said established connection at said transfer rate.