Enhanced mobile communication device, and transportation application thereof
First Claim
1. A mobile communication device for communicating directly with other mobile communication devices in an ad-hoc mode over a wireless medium, the mobile communication device comprising:
- application means for constructing a packet of digital data;
connection means responsive to said application means for connecting to the wireless medium;
transmitting means responsive to said connection means for transmitting the packet of digital data over the wireless medium; and
receiving means in communication with said connection means for sensing the wireless medium and receiving a receive packet of digital data from the other communication devices;
wherein said application means constructs the packet with a limited and variable length such that when transmitted by said transmitting means the probability that the other mobile communication devices receive the packet of digital data is increased.
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Abstract
An enhanced mobile communication device communicates directly with other enhanced mobile communication devices in an ad-hoc mode over a wireless medium. The device transmits and receives packets of digital data. The packets of digital data are such that when transmitted, the probability that they will be received by the other mobile communication devices is increased. The probability is further increased by transmitting the packets a multiple and variable number of times according activity in the wireless medium. Attempts to transmit are made periodically and the period of transmission is adjusted according to activity in the wireless medium. In a transportation application, the packets comprise vehicle traffic congestion update information. The device maintains a traffic database and a map database. Traffic congestion update information is exchanged with other devices. Routes through the map from a source or current position of the device to a destination are computed according to an analysis of the traffic database.
312 Citations
46 Claims
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1. A mobile communication device for communicating directly with other mobile communication devices in an ad-hoc mode over a wireless medium, the mobile communication device comprising:
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application means for constructing a packet of digital data;
connection means responsive to said application means for connecting to the wireless medium;
transmitting means responsive to said connection means for transmitting the packet of digital data over the wireless medium; and
receiving means in communication with said connection means for sensing the wireless medium and receiving a receive packet of digital data from the other communication devices;
wherein said application means constructs the packet with a limited and variable length such that when transmitted by said transmitting means the probability that the other mobile communication devices receive the packet of digital data is increased. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
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29. In a transportation network comprising a plurality of routes and a plurality of vehicles each traversing the transportation network from a current position to a destination, wherein at least some of the vehicles comprise a local traffic database, a vehicle navigation method, the method comprising:
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(a) communicating the traffic databases directly between at least some of the vehicles in the transportation network;
(b) for at least some of the vehicles and local to each vehicle, analyzing the traffic database local to each vehicle; and
(c) for at least some of the vehicles and local to each vehicle, computing a route from the current position to the destination according to the analysis in (b). - View Dependent Claims (30, 31)
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32. A transportation application method for a first vehicle traversing a path from a current position to a first destination in a transportation network comprising a plurality of vehicles, the method comprising:
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(a) periodically receiving at the first vehicle traffic congestion update information from at least one other vehicle of the plurality of vehicles in the transportation network;
(b) periodically determining local to the first vehicle the current position of the first vehicle;
(c) periodically analyzing local to the first vehicle the traffic congestion update information, a traffic database, and a map database;
(d) determining a route from the current position of the first vehicle to the first destination through the transportation network based on the analysis in (c); and
(e) storing the traffic congestion update information in the traffic database. - View Dependent Claims (33, 34, 35, 36, 37, 38, 39)
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40. An enhanced transportation network method in a transportation network comprising a plurality of vehicles, the method comprising:
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(a) periodically receiving traffic congestion update information from at least one other vehicle of the plurality of vehicles in the transportation network;
(b) periodically analyzing the traffic congestion information, a traffic database and a map database;
(c) determining a route from a source to a destination through the transportation network based on the analysis in (b); and
(d) storing the traffic congestion update information in the traffic database.
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41. A transportation network comprising:
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a plurality of mobile communication devices, each mobile communication device traveling with a vehicle traversing the transportation network, wherein each mobile communication device comprises a local traffic database and a local map database; and
an ad-hoc wireless communication network;
wherein said plurality of mobile communication devices transmit and receive traffic congestion update information over said ad-hoc wireless communication network; and
wherein the traffic congestion update information is stored in the local traffic database of each mobile communication device according to an analysis of the traffic congestion update information. - View Dependent Claims (42, 43, 44, 45, 46)
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Specification