Method and protocol for congestion control in a vehicular network
First Claim
Patent Images
1. A node, in a vehicle ad-hoc network (VANET), wherein the node is arranged in a vehicle, wherein the node includes a transmitter, a receiver and a processor for performing steps of a protocol stack, comprising:
- a protocol stack, further comprising;
an application layer;
a link layer; and
a congestion control layer arranged between-the application layer and the link layer, wherein the congestion layer is configured to transfer short messages between the application layer and the link layer, and wherein the short messages are defined according to a standard for the VANET, and wherein the congestion layer optimizes a network-wide rate allocation for the short messages, wherein the congestion control layer determines a transmission probability of a short message as a function of a local density, and wherein the local density depends on a number of neighboring vehicles, and data rates used by the neighboring vehicles, and wherein the transmission probability is
eλ
μ
c0*+λ
μ
c0*−
λ
μ
−
1=0,where μ
is a constant that depends on transmission power, λ
is the local density.
1 Assignment
0 Petitions
Accused Products
Abstract
In a vehicle ad-hoc network (VANET), a transceiver node is arranged in a vehicle. The node includes a protocol stack, which includes an application layer, a link layer; and a congestion control layer arranged between the application layer and the link layer. The congestion layer transfers short messages between the application layer and the link layer. The short messages are defined according to a standard for the VANET, and the congestion layer optimizes a network-wide rate allocation for the short messages.
63 Citations
18 Claims
-
1. A node, in a vehicle ad-hoc network (VANET), wherein the node is arranged in a vehicle, wherein the node includes a transmitter, a receiver and a processor for performing steps of a protocol stack, comprising:
-
a protocol stack, further comprising; an application layer; a link layer; and a congestion control layer arranged between-the application layer and the link layer, wherein the congestion layer is configured to transfer short messages between the application layer and the link layer, and wherein the short messages are defined according to a standard for the VANET, and wherein the congestion layer optimizes a network-wide rate allocation for the short messages, wherein the congestion control layer determines a transmission probability of a short message as a function of a local density, and wherein the local density depends on a number of neighboring vehicles, and data rates used by the neighboring vehicles, and wherein the transmission probability is
eλ
μ
c0 *+λ c0*−
μ
λ
μ
−
1=0,where μ
is a constant that depends on transmission power, λ
is the local density.- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
-
-
16. A method for transmitting a short message by a node in a vehicle ad-hoc network (VANET), wherein the node is arranged in a vehicle, wherein the node includes a transmitter, a receiver and a processor for performing steps of the method, comprising the steps of:
-
determining a local density based on a number of neighboring vehicles, and data rates used by the neighboring vehicles; determining a transmission probability of the short message as a function of a local density
eλ
μ
c0 *+λ c0*−
μ
λ
μ
−
1=0,where μ
is a constant that depends on transmission power, λ
is the local density; andtransmitting the short message if the transmission probability is above a predetermined threshold. - View Dependent Claims (17, 18)
-
-
18. The method of claim 16, further comprising:
determining the local density based on incoming and outgoing short messages, a probability of idle, successful, and failed reception of the short messages at the node.
Specification