Broadcasting Messages in Multi-Channel Vehicular Networks

• US 20110128902A1
• Filed: 12/02/2009
• Published: 06/02/2011
• Est. Priority Date: 12/02/2009
• Status: Active Grant

• Current Assignee: Mitsubishi Electric Research Laboratories, Inc. (Mitsubishi Electric Corporation)
• Original Assignee: Mitsubishi Electric Research Laboratories, Inc. (Mitsubishi Electric Corporation)
• Inventors: Guo, Jianlin
• Granted Patent: US 8,995,327 B2
• Time in Patent Office: Days
• US Class Current: 370/312
• CPC Class Codes: G08G 1/161 Decentralised systems, e.g. inter-vehicle communication
• CPC Class Codes: H04H 60/80 characterised by transmission among terminal devices

Abstract

Message are broadcast in a vehicular environment using a network of nodes, wherein each node includes a transceiver and a processor arranged in a vehicle, and a bandwidth of the network is partitioned into a control channel (CCH) and multiple service channel (SCH). Time is partitioned into alternating control channel intervals (CCHI) and service channel intervals (SCHI). A source node detects an event and broadcasts a message related to the event. The message specifies current channels and next channels used by the source node to broadcast the message. The message is received in a set of relay nodes. Then, each relay node that receives the message rebroadcasts the message during the SCHI on the CCH or any other channels not specified in the message.

Claims

1. A method for broadcasting a message related to a vehicular environment using a network of nodes, wherein each node includes a transceiver and a processor arranged in a vehicle, wherein a bandwidth of the network is partitioned into a control channel (CCH) and multiple service channel (SCH), wherein time is partitioned into alternating control channel intervals (CCHI) and service channel intervals (SCHI), comprising the steps of:

broadcasting by a source node, in response to detecting an event in the vehicular environment during the SCHI, a message related to the event, wherein the message specifies current channels and next channels used by the source node to broadcast the message first and next;

receiving the message in a set of relay nodes, wherein each relay node that receives the message further performs the steps of;

rebroadcasting the message during the SCHI on the CCH or any channels not specified in the message.

2. The method of claim 1, wherein the network is designed according to a Wireless Access in Vehicular Environments (WAVE) standards, which include an IEEE 802.11p and an IEEE P1609 standard.

3. The method of claim 1, wherein the network is designed according to a continuous air-interface, long and medium range (CALM) standards.

4. The method of claim 1, wherein the event is related to safety of life.

5. The method of claim 1, further comprising:

identifying the message uniquely; and

rebroadcasting the message only is the message has not previously been received.

6. The method of claim 1, wherein the rebroadcasting further comprises:

rebroadcasting the message on channels not specified by current channels and next channels.

7. The method of claim 1, further comprising:

performing rebroadcast assessment to determine if the rebroadcasting is needed.

8. The method of claim 6, wherein the channels for rebroadcasting are selected randomly.