Intelligent transportation system station, host processor, vehicle and method therefor

A host processor for an intelligent transportation system, ITS, for a vehicle, the host processor comprises:

• a packet count and vehicle count estimator arranged to receive broadcast ITS transmissions from a plurality of neighbouring vehicles and provide an indication of a number of the plurality of vehicles and a number of packets received from the plurality of neighbouring vehicles;
• a fair resource allocator circuit operably coupled to the packet count and vehicle count estimator and configured to adjust a broadcast message rate and a modulation data rate of an ITS transmission in a cooperative manner based on application reliability requirements, the number of the plurality of vehicles and the indication of the number of received packets;
• and
• a transmitter operably coupled to the fair resource allocator circuit and configured to broadcast at least one ITS message using the adjusted broadcast message rate and adjusted modulation data rate;
• wherein a number of vehicles Vd is estimated using
• V
• d
• =
• P
• C
• R
• m
• ⁢
• ⁢
• i
• ⁢
• ⁢
• n
• where PC represents the total number of packets sensed by a vehicle over a first period, and Rmin represents a minimum transmission message rate used over a second period.

A method for operating an intelligent transportation system, ITS, for a vehicle, the method comprising:

• receiving broadcast ITS transmissions from a plurality of neighbouring vehicles;
• and
• providing an indication of a number of the plurality of vehicles and a number of packets received from the plurality of neighbouring vehicles;
• adjusting a broadcast message rate and a modulation data rate of an ITS transmission in a cooperative manner by a fair resource allocator circuit and based on application reliability requirements, the number of the plurality of vehicles and the indication of the number of received packets;
• broadcasting at least one ITS message using the adjusted broadcast message rate and adjusted modulation data rate;
• wherein a number of vehicles Vd is estimated using
• V
• d
• =
• P
• C
• R
• m
• ⁢
• ⁢
• i
• ⁢
• ⁢
• n
• where PC represents the total number of packets sensed by a vehicle over a first period, and Rmin represents a minimum transmission message rate used over a second period.

A vehicle comprising an integrated intelligent transportation system, ITS, station, that comprises a packet count and vehicle count estimator arranged to receive broadcast ITS transmissions from a plurality of neighbouring vehicles and provide an indication of a number of the plurality of vehicles and a number of packets received from the plurality of neighbouring vehicles;

• wherein the ITS station comprises:
• a fair resource allocator circuit operably coupled to the packet count and vehicle count estimator and configured to adjust a broadcast message rate and a modulation data rate of an ITS transmission in a cooperative manner based on application reliability requirements, the number of the plurality of vehicles and the indication of the number of received packets;
• and
• a transmitter operably coupled to the fair resource allocator circuit and configured to broadcast at least one ITS message using the adjusted broadcast message rate and adjusted modulation data rate;
• wherein a number of vehicles Vd is estimated using
• V
• d
• =
• P
• C
• R
• m
• ⁢
• ⁢
• i
• ⁢
• ⁢
• n
• where PC represents the total number of packets sensed by a vehicle over a first period, and Rmin represents a minimum transmission message rate used over a second period.

An intelligent transportation system, ITS, station for a vehicle, the ITS comprising:

• a packet count and vehicle count estimator arranged to receive broadcast ITS transmissions from a plurality of neighbouring vehicles and provide an indication of a number of the plurality of vehicles and a number of packets received from the plurality of neighbouring vehicles;
• a fair resource allocator circuit operably coupled to the packet count and vehicle count estimator and configured to adjust a broadcast message rate and a modulation data rate of an ITS transmission in a cooperative manner based on application reliability requirements, the number of the plurality of vehicles and the indication of the number of received packets;
• and
• a transmitter operably coupled to the fair resource allocator circuit and configured to broadcast at least one ITS message using the adjusted broadcast message rate and adjusted modulation data rate;
• wherein a minimum required reliability (Rapp) is estimated using:
• R
• app
• ≥
• ∑
• N
• M
• m
• ⁢
• ⁢
• i
• ⁢
• ⁢
• n
• ⁢
• (
• M
• m
• ⁢
• ⁢
• i
• ⁢
• ⁢
• n
• N
• )
• ⁢
• p
• N
• ⁡
• (
• 1
• -
• p
• )
• M
• m
• ⁢
• ⁢
• i
• ⁢
• ⁢
• n
• -
• N
• where:
• Mmin is a minimum message rate required to support the ITS application reliability requirement.