Session endpoint management protocol

• US 7,539,759 B2
• Filed: 04/15/2003
• Issued: 05/26/2009
• Est. Priority Date: 04/15/2003
• Status: Expired due to Fees

• Current Assignee: Panasonic Corporation (Panasonic Holdings Corporation)
• Original Assignee: Panasonic Corporation (Panasonic Holdings Corporation)
• Inventors: Komiya, Daisaku, Khandelwal, Rajesh, Narayanan, Sathya
• Primary Examiner(s): Flynn; Nathan J
• Assistant Examiner(s): WASEL, MOHAMED A
• Application Number:
  US10/414,370
• Publication Number:
  US 20040210657A1
• Time in Patent Office: 2,233 Days
• Field of Search: 709/227, 709/228
• US Class Current: 709/227
• CPC Class Codes: H04L 61/4541 Directories for service discovery
• CPC Class Codes: H04L 67/04 specially adapted for terminals or networks with limited capabilities; specially adapted for terminal portability
• CPC Class Codes: H04L 67/14 Session management for real-time applications in data packet communications networks H04L65/1066
• CPC Class Codes: H04L 67/51 Discovery or management thereof, e.g. service location protocol [SLP] or web services
• CPC Class Codes: H04L 69/24 Negotiation of communication capabilities
• CPC Class Codes: H04L 69/327 in the session layer [OSI layer 5]
• CPC Class Codes: H04L 69/329 in the application layer [OSI layer 7]
• CPC Class Codes: H04L 9/40 Network security protocols
• CPC Class Codes: H04W 84/18 Self-organising networks, e.g. ad-hoc networks or sensor networks

Abstract

A protocol for extending session endpoints in an ad-hoc network environment first performs device discovery to determine local devices within its coverage area and the capability of those devices. These local devices then exchange session descriptions with the endpoint device. If the current session may be supported by one of the local devices, the endpoint device, responsive to a command from an user, transfers the session endpoint to the local device and the endpoint device acts as a proxy for the local device in the session. Optionally, if the local device has a path to the correspondent node that is independent of the path through the endpoint device, it establishes the session along this path and then signal the endpoint node to terminate its session.

Claims

1. A method for managing session endpoints in an ad-hoc network environment including a first device and at least one local device, and a primary network environment including a correspondent node, the method comprising the steps of:

exchanging session description messages between the correspondent node and the first device to establish the first device as the primary endpoint of an internet protocol (IP) session between the first device and the correspondent node;

discovering, by the first device, an identity of the at least one local device;

receiving, by the first device, information describing any IP sessions in which the at least one local device is participating, from the at least one local device via a session description information message; and

sending, by the first device, a MOVE message to establish the at least one local device as a secondary endpoint of the IP session established between the first device and the correspondent node.

2. The method according to claim 1, wherein the step of discovering the identity of the at least one local device includes the step of performing a device discovery operation according to a predetermined device discovery protocol.

3. The method according to claim 1, wherein the step of discovering the identity of the at least one local device further includes the steps of:

sending, by the first device, a device information message requesting device capability data; and

sending, by the at least one local device, in response to the device information message, a further device information message, including capability data of the at least one local device, to the first device.

4. The method according to claim 1, wherein the step of receiving the session description information from the at least one local device further includes the step of receiving device capability information from the at least one local device via the session description information message.

5. The method according to claim 1, further including the step of sending, by the first device a further session description information message describing the IP session between the first device and the correspondent node, to the at least one local device.

6. The method according to claim 1, further including the steps of:

configuring the at least one local device to receive and process data of the IP session, in response to the MOVE message; and

forwarding, by the first device, the session data to the at least one local device.

7. The method according to claim 6 wherein the step of configuring the at least one local device to receive and process the session data is performed by the at least one local device in response to commands received by the at least one local device from a user.

8. The method according to claim 6 wherein the step of configuring the at least one local device to receive and process the IP session data is performed by the at least one local device in response to commands received by the at least one local device from the first device.

18. The method according to claim 1, wherein the information describing any IP session includes a session description specified by a session description protocol.

19. The method according to claim 1, wherein the IP session is a file transfer protocol session.

20. The method according to claim 1, wherein the information describing any IP session in which the at least one local device is participating includes information regarding each of a plurality of IP sessions in which the at least one local device is an endpoint or a transfer node in a multi-hop link.

9. A system, comprising:

a first device,

plurality of local devices,

a primary network environment including a correspondent node, and

a protocol for managing session endpoints in an ad-hoc network system, the protocol comprising;

session description messages exchanged between the correspondent node and the first device to establish the first device as the primary endpoint of an internet protocol (IP) session between the first device and the correspondent node;

an information message which is sent by one of the first device or at least one local device to request information from or provide information to at least one of the plurality of local devices in the ad-hoc network; and

a MOVE message which is sent by one of the plurality of local devices to one of the first device or an other device of the plurality of local devices to cause the first device to establish the other device as a secondary endpoint of the IP session, the MOVE message includes

a PRIMARY ENDPOINT field which identifies the first device,

a FROM field which identifies a device of the plurality of devices which is sending the message, and

a TO field which identifies a further device of the plurality of devices to which the message is addressed, wherein the further device is to be established as the secondary endpoint of the IP session.

10. The system according to claim 9, wherein the information message includes:

an information-type field which identifies a type of information being requested or provided;

an information-state field which indicates whether the message is requesting or providing information; and

a content field which contains any information provided by the information message.

11. The system according to claim 9 wherein the IP session includes multiple portions and the protocol further includes a SPLIT message which is sent by one of the plurality of devices to establish first and second ones of the plurality of devices as secondary endpoints of respectively different portions of the IP session.

12. The system according to claim 11, further including a MERGE message which is sent by one of the plurality of devices to establish one device of the plurality of devices as the secondary endpoint of the portions of the single IP session established in the first and second ones of the plurality of devices.

13. The system according to claim 9, further including a CONNECT message which is sent by one of the plurality of devices to the first device to notify the first device of an incoming IP session or to cause the first device to initiate an IP session.

14. The system according to claim 13, further including a TERMINATE message which is sent by one of the plurality of devices to the first device to cause the first device to terminate the IP session.

15. A method for managing an endpoint of a logical internet protocol (IP) session in a first device to selectively extend the endpoint to at least one local device that is within a coverage area of the first device, the method comprising the steps of:

receiving, by the first device a session description message to establish the first device as a primary endpoint of the logical IP session;

discovering, by the first device, an identity of the at least one local device;

receiving, by the first device, session participating information describing any IP sessions in which the at least one local device is participating, from the at least one local device via a session description information message; and

sending, by the first device, a MOVE message to establish the at least one local device as a secondary endpoint of the logical IP session with the first device remaining as the primary endpoint of the logical IP session.

16. The method according to claim 15, wherein the step of discovering the identity of the at least one local device includes the step of performing a device discovery operation according to a device discovery protocol.

17. The method according to claim 16, wherein the step of discovering the identity of the at least one local device further includes the step of sending a device capability information message from the at least one local device to the first device.