Scalable disruptive-resistant communication method

• US 8,295,257 B2
• Filed: 03/13/2009
• Issued: 10/23/2012
• Est. Priority Date: 03/13/2009
• Status: Active Grant

• Current Assignee: Telcordia Technologies Incorporated (Telefonaktiebolaget LM Ericsson), Toyota Infotechnology Center USA, Inc.
• Original Assignee: Telcordia Technologies Incorporated (Telefonaktiebolaget LM Ericsson), Toyota Infotechnology Center USA, Inc.
• Inventors: Chen, Wai, Chennikara-Varghese, Jasmine, Vuyyuru, Rama, Onishi, Ryokichi
• Primary Examiner(s): Rinehart, Mark
• Assistant Examiner(s): ANWAR, MOHAMMAD S
• Application Number:
  US12/403,571
• Publication Number:
  US 20100232404A1
• Time in Patent Office: 1,320 Days
• Field of Search: 370/338, 370/349, 370/235
• US Class Current: 370/338
• CPC Class Codes: G08G 1/091 Traffic information broadcasting broadcasting communication H04H
• CPC Class Codes: G08G 1/094 Hardware aspects; Signal processing or signal properties, e.g. frequency bands
• CPC Class Codes: G08G 1/22 Platooning, i.e. convoy of communicating vehicles
• CPC Class Codes: H04L 47/36 by determining packet size, e.g. maximum transfer unit [MTU]
• CPC Class Codes: H04W 28/0226 based on location or mobility handoff or reselection H04W36/00; mobile application services making use of the location of users or terminals H04W4/02
• CPC Class Codes: H04W 28/065 using assembly or disassembly of packets
• CPC Class Codes: H04W 28/10 Flow control between communication endpoints
• CPC Class Codes: H04W 4/44 for communication between vehicles and infrastructures, e.g. vehicle-to-cloud [V2C] or vehicle-to-home [V2H]

Abstract

A method for transmitting data in vehicular network comprising determining a communication window between at least two nodes, grouping a plurality of fragments of content together into an aggregate fragment block, forwarding the aggregate fragment block to a target node and assembling the plurality of fragments into the content. The content is divided into the plurality of fragments. A fragment signature is generated for the fragments that contain fragment index information regarding each fragment. Each fragment is unambiguously identified by its signature. A number of fragments grouped into the aggregate fragment block is dependent on the communication window.

Claims

1. A method for transmitting data in vehicular network comprising:

receiving a request for content from a wireless device associated with a moving vehicle, the request including a list of fragment index information from a fragment signature, the moving vehicle'"'"'s current position, a direction of motion and speed of the moving vehicle to estimate network connection time between the moving vehicle and a second wireless device associated with a second moving vehicle;

determining a communication window between the wireless device associated with the moving vehicle and the second wireless device associated with the second moving vehicle that received the request;

grouping a plurality of fragments corresponding to the list of fragment index information together into an aggregate fragment block; and

forwarding the aggregate fragment block to the wireless device associated with the second moving vehicle.

2. The method for transmitting data according to claim 1, further comprising receiving a request for the fragment signature;

and

broadcasting a response comprising the fragment signature.

3. The method for transmitting data according to claim 2, further comprising determining a predicted trajectory of the moving vehicle.

4. The method for transmitting data according to claim 3, wherein the predicted trajectory of the moving vehicle is inferred from a location of each road-side unit (RSU) in radio communication with the moving vehicle.

5. The method for transmitting data according to claim 1, wherein a number of fragments grouped into the aggregate fragment block depends on the communication window.

6. The method for transmitting data according to claim 1, further comprising:

broadcasting the fragment signature.

7. The method for transmitting data according to claim 1, further comprising:

dividing the content into the plurality of fragments; and

generating the fragment signature that contains fragment index information regarding each fragment, where each fragment is unambiguously identified by its signature.

8. The method for transmitting data according to claim 7, further comprising storing the fragment index information in memory.

9. The method for transmitting data according to claim 1, further comprising:

verifying an authenticity of each of the forwarded fragments; and

storing each of the forwarded fragments, based upon the verification, where each of the received fragments is identified by the fragment index information in the fragment signature.

10. The method for transmitting data according to claim 9, further comprising determining local storage lifespan, scope and trajectory for each fragment.

11. The method for transmitting data according to claim 9, further comprising assigning a fragment trajectory for each fragment.

12. The method for transmitting data according to claim 1, wherein said grouping is based upon a priority, time, scope and trajectory of the target node and trajectory of the fragment, for each fragment.

13. The method for transmitting data according to claim 1, further comprising:

determining if the fragments corresponding to the list of fragment index information in the request are stored locally in the wireless communication device;

forwarding the request to a neighboring vehicle if at least one fragment is not locally available.

14. A method for transmitting data in vehicular network comprising:

receiving a request for content from a wireless device associated with a moving vehicle, the request including a list of fragment index information from a fragment signature, the moving vehicle'"'"'s current position, a direction of motion and speed of the moving vehicle to estimate network connection time between the moving vehicle and a second wireless device associated with a second moving vehicle;

determining a communication window between the wireless device associated with the moving vehicle and the second wireless device associated with the second moving vehicle that received the request;

grouping a plurality of fragments corresponding to the list of fragment index information together into an aggregate fragment block; and

forwarding the aggregate fragment block to the wireless device associated with the second moving vehicle, wherein fragment size of a fragment is variable based upon an average communication window and bandwidth of wireless network.

15. A method for transmitting data in a mobile ad-hoc network comprising:

dividing data into fragments;

creating a fragment signature containing a fragment index;

broadcasting, periodically the fragment signature, a speed, and a direction of travel of the vehicle;

receiving a request for fragment listed in the fragment signature, where a number of fragments is based upon an estimated communication window determined from at least the speed and direction of travel in the periodic broadcast;

grouping the fragments into aggregate fragment blocks, each having a block size determined by the window of communication; and

transmitting the aggregate fragment blocks.