Apparatus and method for establishing a session in a radio network organized with mobile nodes

• US 20040132452A1
• Filed: 12/22/2003
• Published: 07/08/2004
• Est. Priority Date: 12/30/2002
• Status: Abandoned Application

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Lee, Dong-Hee
• Application Number:
  US10/740,894
• Publication Number:
  US 20040132452A1
• Time in Patent Office: Days
• US Class Current: 455/445
• CPC Class Codes: H04L 65/1101 Session protocols
• CPC Class Codes: H04L 65/1104 Session initiation protocol [SIP]
• 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]
• CPC Class Codes: H04W 80/00 Wireless network protocols or protocol adaptations to wireless operation

Abstract

Apparatus and method for establishing a session in a radio network organized with mobile nodes. If a source mobile node requests a session setup from the destination mobile node and a distance between the transmission and destination mobile nodes is longer than a predetermined distance, the apparatus uses message relay mobile nodes. The source mobile node transmits a session setup request message to the destination mobile node via the message relay mobile nodes. Message transmission time information between mobile nodes is detected by individual mobile nodes and is stored in the same. The received session setup request message is stored in individual mobile nodes. Therefore, if all the mobile nodes transmit their session setup request messages to neighboring mobile nodes and there is no response to the transmitted session setup request messages, the mobile nodes retransmits the stored session setup request message.

Claims

1. A method for controlling a source mobile node to establish a session to a destination mobile node via message relay mobile nodes in a radio network comprised of the source mobile node, the destination mobile node, and one or more message relay mobile nodes, comprising the steps of:

(a) creating a session setup request message to be transmitted to the destination mobile node, storing the created session setup request message, and at the same time transmitting the created session setup request message to one message relay mobile node from among the message relay mobile nodes; and

(b) if a session setup permission standby message corresponding to the session setup request message is not received from the message relay mobile node having transmitted the session setup request message before a predetermined link retransmission time elapses, re-transmitting the stored session setup request message.

2. The method as set forth in claim 1, wherein the session setup request message includes a number of link-unit transmission times.

3. The method as set forth in claim 2, further comprising the step of:

(c) if a maximum number of link-unit transmission times is determined, and the number of link-unit transmission times reaches the determined maximum number of link-unit transmission times, deleting the stored session setup request message.

4. The method as set forth in claim 3, wherein the maximum number of link-unit transmission times is calculated using a Round Trip Delay Time (RTDT) between the source mobile node and the destination mobile node and a link retransmission time.

5. The method as set forth in claim 1, further comprising the step of:

(d) if a session setup permission message associated with the session setup request message is not received from the message relay mobile node until a global retransmission time elapses, re-transmitting the stored session setup request message.

6. A method for controlling a message relay mobile node to route a session setup state in a direction from a source mobile node to the destination mobile node at which a session setup request is to be transmitted, in a radio network comprised of the source mobile node, the destination mobile node, and one or more message relay mobile nodes, comprising the steps of:

(a) storing the received session setup request message, and transmitting the stored session setup request message to either the message relay mobile node or the destination mobile node; and

(b) if a session setup permission standby message corresponding to the session setup request message is not received from the mobile node having transmitted the session setup request message before a predetermined link retransmission time elapses, re-transmitting the stored session setup request message.

7. The method as set forth in claim 6, wherein the session setup request message includes a number of link-unit transmission times.

8. The method as set forth in claim 7, further comprising the step of:

(c) if a maximum number of link-unit transmission times is determined, and the number of link-unit transmission times reaches the determined maximum number of link-unit transmission times, deleting the stored session setup request message.

9. The method as set forth in claim 8, wherein the maximum number of link-unit transmission times is calculated using a Round Trip Delay Time (RTDT) between the source mobile node and the destination mobile node and a link retransmission time.

10. The method as set forth in claim 6, further comprising the step of:

(d) if the destination mobile node receives the session setup request message, transmitting the session setup permission message corresponding to the session setup request message to a mobile node having transmitted the session setup request message.

11. The method as set forth in claim 10, wherein the session setup permission message is transmitted to the source mobile node by sequentially passing through the message relay mobile nodes.

12. An apparatus for establishing a session from a source mobile node to a destination mobile node via message relay mobile nodes in a radio network, comprising:

a source mobile node for storing a session setup request message simultaneously transmitting it to the message relay mobile node, and re-transmitting the stored session setup request message when a session setup permission standby message associated with the transmitted session setup request message is not received before a predetermined link retransmission time elapses;

one or more message relay mobile nodes for transmitting a session setup permission standby message to a mobile node having transmitted the session setup request message, transmitting the received session setup request message to another message relay mobile node or the destination mobile node, and re-transmitting the stored session setup request message when a session setup permission standby message associated with the session setup request message is not received before a predetermined link retransmission time elapses; and

a destination mobile node for transmitting the session setup permission standby message associated with the received session setup request message.

13. The apparatus as set forth in claim 12, wherein the source mobile node or the message relay mobile node includes a number of link-unit transmission times in the session setup request message.

14. The apparatus as set forth in claim 13, wherein the destination mobile node having transmitted the session setup permission standby message transmits the session setup permission message to a mobile node having transmitted the session setup permission standby message.

15. The apparatus as set forth in claim 14, wherein the message relay mobile node sequentially transmits the received session setup permission message to the source mobile node.

16. The apparatus as set forth in claim 13, wherein the message relay mobile node deletes the stored session setup request message if the number of link-unit transmission times reaches a maximum number of link-unit transmission times.

17. The apparatus as set forth in claim 16, wherein the source mobile node calculates the maximum number of link-unit transmission times using a Round Trip Delay Time (RTDT) between the source mobile node and the destination mobile node and a link retransmission time.

18. The apparatus as set forth in claim 12, wherein the source mobile node, if a session setup permission message associated with the session setup request message is not received from the message relay mobile node until a global retransmission time elapses, re-transmits the stored session setup request message.

19. The apparatus as set forth in claim 18, wherein the message relay mobile node sequentially transmits the session setup permission message received from the destination mobile node to the source mobile node.