Signaling for Safety Message Transmission in Vehicular Communication Networks

• US 20110128849A1
• Filed: 12/02/2009
• Published: 06/02/2011
• Est. Priority Date: 12/02/2009
• Status: Abandoned Application

• Current Assignee: Mitsubishi Electric Research Laboratories, Inc. (Mitsubishi Electric Corporation)
• Original Assignee: Mitsubishi Electric Research Laboratories, Inc. (Mitsubishi Electric Corporation)
• Inventors: Guo, Jianlin
• Application Number:
  US12/629,607
• Publication Number:
  US 20110128849A1
• Time in Patent Office: Days
• US Class Current: 370/235
• CPC Class Codes: H04W 28/10 Flow control between communication endpoints
• CPC Class Codes: H04W 74/0816 with collision avoidance
• CPC Class Codes: H04W 74/085 collision avoidance
• CPC Class Codes: H04W 74/0866 using a dedicated channel for access

Abstract

Messages are broadcast in a vehicular environment using a network of nodes. Each node includes a transceiver and a processor arranged in a vehicle. A bandwidth of the network is partitioned into a set of channels including a control channel (CCH) and multiple service channel (SCH). Time is partitioned into alternating control channel intervals (CCHI) and service channel intervals (SCHI). A particular node transmits an attention signal indicating intent to access a particular channel to transmit a high priority safety message, wherein the network is designed according to a standard for a vehicular environment. The node then waits a random length backoff time and transmits the high priority safety message related to the vehicular environment after the random length backoff time.

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 set of channels including 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:

transmitting, by a particular node in a network, an attention signal indicating an intent to access a particular channel to transmit a high priority safety message, wherein the network is designed according to a standard for a vehicular environment;

waiting a random length backoff time; and

transmitting the high priority safety message related to the vehicular environment after the random length backoff time.

2. The method of claim 1, wherein the standard is IEEE 802.11p.

3. The method of claim 1, wherein the standard is IEEE P1609.

4. The method of claim 1, wherein the standard communications access for land mobiles (CALM).

5. The method of claim 1, wherein the channel is the CCH.

6. The method of claim 1, wherein the channel is one of the SCH.

7. The method of claim 1, wherein the backoff time is after a short interframe space time.

8. The method of claim 1, further comprising:

deferring transmissions by other nodes allocated to the particular channel when detecting the attention signal.

9. The method of claim 1, wherein the control channel interval is adaptive and variable in length.