IP communication system for wireless terminal and communication method for wireless terminal

• US 20020019880A1
• Filed: 07/02/2001
• Published: 02/14/2002
• Est. Priority Date: 07/03/2000
• Status: Abandoned Application

• Current Assignee: Mitsubishi Denki Kabushiki Kaisha (Mitsubishi Electric Corporation)
• Original Assignee: Mitsubishi Denki Kabushiki Kaisha (Mitsubishi Electric Corporation)
• Inventors: Sakakura, Takashi
• Application Number:
  US09/895,156
• Publication Number:
  US 20020019880A1
• Time in Patent Office: Days
• US Class Current: 709/245
• CPC Class Codes: H04L 61/4552 Lookup mechanisms between a plurality of directories; Synchronisation of directories, e.g. metadirectories
• CPC Class Codes: H04L 61/5084 Providing for device mobility network addressing or numbering for mobility support in wireless networks H04W8/26; mobile IP H04W80/04
• CPC Class Codes: H04W 36/0011 for data sessions of end-to-end connection
• CPC Class Codes: H04W 36/0019 adapted for mobile IP [MIP]
• CPC Class Codes: H04W 8/26 Network addressing or numbering for mobility support
• CPC Class Codes: H04W 80/02 Data link layer protocols
• CPC Class Codes: H04W 80/04 Network layer protocols, e.g. mobile IP [Internet Protocol]

Abstract

An IP communication system for wireless terminal which eliminates extra traffic to be used for data transfer so as to improve communication latency. The IP communication system for wireless terminal includes a control center, which controls a plurality of wireless terminals by way of a base station for communicating with an internet terminal over the Internet. The control center controls a plurality of IP addresses. The control center is provided with a database for storing the MAC addresses of wireless terminals controlled, the operating status of the respective wireless terminals controlled, and the identification of the respective base stations. The control center allocates one of the IP addresses available to a wireless terminal in the database in response to a request for communication between the wireless terminal and the internet terminal. The wireless terminal communicates with the internet terminal based on this IP address allocated.

Claims

1. An IP (Internet Protocol) communication system for wireless terminal controlled by a control center, in which a wireless terminal communicates with an internet terminal over the Internet, the IP communication system for wireless terminal comprising:

a database for storing a plurality of IP addresses;

wherein the control center allocates one of the plurality of IP addresses to the wireless terminal for communication in response to an inquiry about the IP address of the wireless terminal; and

wherein the control center transmits a failure message to the internet terminal in response to the inquiry about the IP address of the wireless terminal if failing to detect the wireless terminal.

2. The IP communication system for wireless terminal of claim 1, further comprising another base station having a communication zone;

wherein each of the base station and the another base station transmits a pilot signal for measuring strength of a signal by the wireless terminal;

wherein the wireless terminals requests the control center to perform a hand-over to the communication zone of the another base station which the wireless terminal is entering based on the pilot signal;

wherein the database further storing a location of the wireless terminal; and

wherein the control center updates the IP route to the wireless terminal, and the location of the wireless terminal stored in the database based on the hand-over.

3. The IP communication system for wireless terminal of claim 1, wherein the control center cancels the one of the IP addresses allocated to the wireless terminal either one of detecting a termination of the communication between the internet terminal and the wireless terminal and of failing to detect the wireless terminal during a period.

4. The IP communication system for wireless terminal of claim 1, wherein the control center allocates a plurality of communication channels on shared wireless medium to be used for a communication to the wireless terminal.

5. The IP communication system for wireless terminal of claim 1, further comprising:

a plurality of control centers; and

a terminal location database for registering a last one of the plurality of switching centers allocating one of the plurality of IP addresses to the wireless terminal;

wherein the terminal location database forwards the inquiry about the IP address of the wireless terminal issued by the internet terminal to the last one of the plurality of control centers; and

wherein the terminal location database forwards the inquiry about the IP address of the wireless terminal to an adjacent one of the plurality of control centers to the last one of the plurality of control centers if failing to detect the wireless terminal in the last one of the plurality of control centers.

7. The IP communication system for wireless terminal of claim 4, wherein the control center allocates the plurality of channels by examining a MAC frame.

6. An IP (Internet Protocol) communication method for wireless terminal controlled by a control center, in which a wireless terminal communicates with an internet terminal over the Internet, the IP communication method comprising:

storing a plurality of IP addresses in a database;

detecting an inquiry about an IP address of the wireless terminal for communication between the internet terminal and the wireless terminal;

allocating one of the plurality of IP addresses to the wireless terminal for communication; and

transmitting a failure message to the internet terminal in response to the inquiry about the IP address of the wireless terminal if failing to detect the wireless terminal.

12. The IP (Internet Protocol) communication method for wireless terminal of claim 6 further comprising:

having a base station to issue a pilot signal for measuring strength of a signal;

receiving a request from the wireless terminal for a hand-over of a call to a channel in a communication zone the wireless terminal is entering based on the pilot signal;

storing a location of the wireless terminal in the database based on the base station; and

updating the location of the wireless terminal stored in the database based on the hand-over.

13. The IP (Internet Protocol) communication method for wireless terminal of claim 6, further comprising:

canceling the one of the IP addresses allocated to the wireless terminal either one of detecting a termination of the communication between the internet terminal and the wireless terminal and of failing to detect the existence of the wireless terminal during a period.

14. The IP (Internet Protocol) communication method for wireless terminal of claim 6, further comprising:

allocating a plurality of channels to be used for a communication to the wireless terminal.

8. An IP (Internet Protocol) communication system for wireless terminal controlled by a control center, in which a wireless terminal communicates with an internet terminal using an IP address, the IP communication system for wireless terminal comprising:

a database for storing a plurality of IP addresses; and

wherein the control center allocates one of the plurality of IP addresses to the wireless terminal in response to a request from the wireless terminal for communicating with the another wireless terminal as the internet terminal.

9. A communication method for wireless terminal, in which a wireless terminal communicates with a plurality of wireless terminals, the communication method for wireless terminal comprising:

transmitting a request for a broadcast communication on a channel;

receiving a ready message from a wireless terminal in the group in response to the request;

starting the broadcast communication upon reception of the ready message from the wireless terminal in the group; and

prohibiting other wireless terminals from accessing the channel during the broadcast communication.

10. A communication method for wireless terminal, in which a wireless terminal makes a communication with another wireless terminal, the communication method for wireless terminal comprising:

transmitting a request for continuing the communication on a channel for at least one given transmission period;

receiving an acknowledge message upon reception of the request for continuing the communication; and

prohibiting other wireless terminals from accessing the channel during the at least a given period.

11. A communication method for wireless terminal, in which a wireless terminal communicates with another wireless terminal, the communication method for wireless terminal comprising:

transmitting a request for occupying a plurality of channels by a wireless terminal;

allocating the plurality of channels to the wireless terminal; and

using the plurality of channels allocated in the allocating step.