ATM communication system, process migration method in the ATM communication system, and handover processing method

• US 20030021279A1
• Filed: 09/25/2002
• Published: 01/30/2003
• Est. Priority Date: 03/13/1995
• Status: Active Grant

• Current Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation)
• Original Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation)
• Inventors: Shobatake, Yasuro
• Granted Patent: US 7,272,143 B2
• Time in Patent Office: Days
• US Class Current: 370/395.2
• CPC Class Codes: H04L 2012/5607 Radio
• CPC Class Codes: H04L 2012/5616 Terminal equipment, e.g. codecs, synch.
• CPC Class Codes: H04L 2012/5619 Network Node Interface, e.g. tandem connections, transit switching
• CPC Class Codes: H04L 2012/5642 Multicast/broadcast/point-multipoint, e.g. VOD
• CPC Class Codes: H04Q 11/0478 Provisions for broadband connections

Abstract

An ATM communication system has a connection setting section for controlling a plurality of ATM switches to set an n:n bidirectional ATM connection having n terminals of a plurality of constituent terminals as terminal points and using the VPI/VCI for identifying the n terminal points, and a process ID allocating section for allocating an MID as a process ID to a plurality of processes, executed by the n terminals for sending a message to the bidirectional ATM connection. The ATM communication system migrates a process executed on an arbitrary terminal to another terminal while keeping the process ID allocated to the processes. Where a dead-lock occurs due to that a process becomes a sleep state for the reason of that the bandwidth of a physical link is insufficient for executing in parallel the processes on the ATM communication system, the bandwidth of the physical link that a sleeping process occupies is intercepted to avoid a CAC dead-lock.

Claims

1. An ATM communication system comprising:

a plurality of ATM switches; and

a plurality of terminals connected to each other thorough said plurality of ATM switches,

wherein, since a bandwidth of a connection required to be set exceeds a remaining bandwidth of at least one physical link between said ATM switches or between said ATM switches and said terminals, when dead-lock occurs when a process executed by one of said plurality of terminals becomes a sleep state, the process executed by said ATM communication system intercepts a bandwidth of at least one physical link assured by a group of sleeping processes to allocate it to a bandwidth required by a process which requires the connection setting.

2. An ATM communication system comprises:

a plurality of ATM switches;

a plurality of terminals connected to each other through said plurality of ATM switches;

connection setting means for controlling said plurality of ATM switches to set an n;

n bidirectional ATM connection having n terminals of said plurality of terminals as terminal points, and the same connection identifier for identifying said n terminal points;

process identifier allocating means for allocating, to a plurality of processes, executed by said n terminals, for sending a message to said bidirectional ATM connection, a process identifier for identifying the processes; and

migrating means for the process executed on an arbitrary terminal of said n terminals to another terminal of said n terminals while keeping the process identifier allocated to the processes by said process identifier allocating means.

3. An ATM communication system according to claim 2, wherein the process sends a message constituted by a single cell including the identifier of the terminal in which the process is executed and the process identifier allocated to the process to said bi-directional ATM connection at predetermined time intervals, when the message constituted by a single cell including the process identifier allocated to the process is received, holds the contents of the message, and forms and holds a table of the process identifier allocated to the process connected to said bidirectional ATM connection.

4. An ATM communication system according to claim 2, wherein a process group for managing resources in the processes respectively have a global unique resource identifier for identifying resources, and when said ATM communication system is powered on, a master resourceprocess for allocating the resources to be managed by the processes to the process group identifies, by the process identifier, a process which manages a resource allocated when said ATM communication system is powered on.

5. An ATM communication system according to claim 4, wherein the process group for managing resources manages the bandwidth of at least one predetermined physical link between at least said ATM switches or between said ATM switches and said terminals, having a global resource identifier to identify said physical links, and identifies a process in which a master resource process which allocates physical links to be managed by the processes to the process group when said ATM communication system is activated manages a resource allocated by the process identifier when said ATM communication system is activated, and

since the bandwidth of a connection required to be set by a process executed in one of said plurality of terminals exceeds the remaining bandwidth of at least one physical link between said ATM switches or between said ATM switches and said terminals, when it is cleared by communication between the resource process groups that dead-lock occurs when the process becomes a sleep state, a process executed in said ATM communication system intercepts a bandwidth of at least one physical link assured by a group of sleeping processes, and allocates a bandwidth required by a process in which one of said resource process group requires the connection setting.

6. An ATM communication system comprising:

a plurality of ATM switches;

a plurality of terminals connected to each other through said ATM switches;

connection setting means for controlling said plurality of ATM switches to set an bidirectional ATM connection having n terminals of said plurality of terminals as n terminal points and using the same VPI and VCI of a cell header serving as a connection identifier for identifying the n terminal points;

process identifier allocating means for allocating, to a plurality of processes for sending a message to said bidirectional ATM connection, a multiplex identifier of an AAL3/4 as a process identifier for identifying the processes; and

migrating means for migrating the process executed on an arbitrary terminal of said n terminals to another terminal of said n terminals while the process identifier allocated to said processes by said process identifier allocating means.

7. An ATM communication system according to claim 6, wherein the process sends a message constituted by a single cell including the identifier of the terminal in which the process is executed and the process identifier allocated to the process to said bidirectional ATM connection at predetermined time intervals, when the message constituted by a single cell including the process identifier allocated to the process is received, holds the contents of the message, and forms and holds a table of the process identifier allocated to the process connected to said bidirectional ATM connection.

8. An ATM communication system according to claim 6, wherein a process group for managing resources in the processes respectively have a global unique resource identifier for identifying resources, and when said ATM communication system is activated, a master resource process for allocating the resources to be managed by the processes to the process group identifies, by the process identifier, a process which manages a resource allocated when said ATM communication system is activated.

9. An ATM communication system according to claim 8, wherein the process group for managing resources manages the bandwidth of at least one predetermined physical link between at least said ATM switches or between said ATM switches and said terminals, having a global resource identifier to identify said physical links, and identifies a process in which a master resource process which allocates physical links to be managed by the processes to the process group when said ATM communication system is activated manages a resource allocated by the process identifier when said ATM communication system is activated, and

since the bandwidth of a connection required to be set by a process executed in one of said plurality of terminals exceeds a remaining bandwidth of at least one physical link between said ATM switches or between said ATM switches and said terminals, when it is cleared by communication between the resource process groups that dead-lock occurs when the process is slept, a process executed in said ATM communication system intercepts a bandwidth of at least one physical link assured by the slept process group, and allocates it to a bandwidth required by a process in which one of said resource process group requires the connection setting.

10. An ATM communication system comprising:

a plurality of ATM switches;

a plurality of terminals connected to each other through said ATM switches;

connection setting means for controlling said plurality of ATM switches to set an n;

n bidirectional ATM connection having n terminals of said plurality of terminals as n terminal points and using the same VPI of a cell header serving as a connection identifier for identifying the n terminal points;

process identifier allocating means for allocating, to a plurality of processes for sending a message to said bidirectional ATM connection, a VCI of a cell header serving as a process identifier for identifying the processes; and

migrating means for migrating the process executed on an arbitrary terminal of said n terminals to another terminal of said n terminals while the process identifier allocated to said processes by said process identifier allocating means.

11. An ATM communication system according to claim 10, wherein the process sends a message constituted by a single cell including the identifier of the terminal in which the process is executed and the process identifier allocated to the process to said bi-directional ATM connection at predetermined time intervals, when the message constituted by a single cell including the process identifier allocated to the process is received, holds the contents of the message, and forms and holds a table of the process identifier allocated to the process connected to said bidirectional ATM connection.

12. An ATM communication system according to claim 10, wherein a process group for managing resources in the processes respectively have a global unique resource identifier for identifying resources, and when said ATM communication system is powered on, a master resource process for allocating the resources to be managed by the processes to the process group identifies, by the process identifier, a process which manages a resource allocated when said ATM communication system is powered on.

13. An ATM communication system according to claim 12, wherein the process group for managing resources manages the bandwidth of at least one predetermined physical link between at least said ATM switches or between said ATM switches and said terminals, having a global resource identifier to identify said physical links, and identifies a process in which a master resource process which allocates physical links to be managed by the processes to the process group when said ATM communication system is activated manages a resource allocated by the process identifier when said ATM communication system is activated, and

since the bandwidth of a connection required to be set by a process executed in one of said plurality of terminals exceeds the remaining bandwidth of at least one physical link between said ATM switches or between said ATM switches and said terminals, when it is cleared by communication between the resource process groups that dead-lock occurs when the process becomes a sleep state, a process executed in said ATM communication system intercepts a bandwidth of at least one physical link assured by a group of sleeping processes, and allocates a bandwidth required by a process in which one of said resource process group requires the connection setting.

14. A process migration method in an ATM communication system comprising the steps of:

setting, through a plurality of ATM switches, an n;

n bidirectional ATM connection having n terminals of a plurality of terminals as terminal points and using the same connection identifier for identifying the n terminal points; and

allocating, to a plurality of processes, executed by the n terminals, for sending a message to said bidirectional ATM connection, the process identifier for identifying the processes, and then migrating the process executed on an arbitrary terminal of said n terminals to another terminal of said n terminals while keeping the process identifier allocated to the processes.

15. An ATM communication system comprising:

a plurality of ATM switches;

a plurality of fixed terminals;

a plurality of mobile terminal interface apparatuses connected to each other through said plurality of ATM switches and arranged different radio zones for interfacing mobile terminals;

an n;

m first unidirectional ATM connection having n terminals of said plurality of fixed terminals as input side terminal points and m mobile terminal interface apparatuses of said plurality of mobile terminal interface apparatus;

connection setting means for controlling said plurality of ATM switches to set an m;

n second uni-directional ATM connection having said m mobile terminal interface apparatus as input side terminal points and said n fixed terminals as output side terminal points; and

connection identifier allocating means for allocating the same connection identifier to identify said m input side terminal points of said first unidirectional ATM connection and identify said m output side terminals of said second unidirectional ATM connection,

wherein said mobile terminal for specifying an ATM connection used in communication with said fixed terminals with the connection identifier allocated by said connection identifier allocating means.

16. A handover processing method in an ATM communication system, comprising the steps of:

setting an n;

m first unidirectional ATM connection having n terminals of said plurality of fixed terminals as input side terminal points and m mobile terminal interface apparatuses of said plurality of mobile terminal interface apparatus and an m;

n second unidirectional ATM connection having said m mobile terminal interface apparatus as input side terminal points and said n fixed terminals as output side terminal points by controlling said plurality of ATM switches;

allocating the same connection identifier to identify said m input side terminal points of said first unidirectional ATM connection and identify said m output side terminals of said second unidirectional ATM connection; and

specifying an ATM connection used in communication with said fixed terminals with the connection identifier allocated by said connection identifier allocating means when said mobile terminal communicates with said fixed terminal while moving.