Controller Unit, Communiction Device and Communication System as Well as Method of Communication Between and Among Mobile Nodes
First Claim
Patent Images
1. A controller unit (40;
-
40′
), in particular a central data processing unit, for example a relay control box, for controlling communication between and among mobile nodes (10, 12, 14, 16), in particular between and among vehicles, each node (10, 12, 14, 16) being designed for receiving and transmitting messages (22), in particularat least one hello message, and/orat least one data message, for example at least one warning message,characterized by at least one decision unit (482;
482′
) for choosing, in particular for calculating, the transmission parameters, in particular both the data rate and the transmission power, for at least part of the messages (22) to be transmitted, in particular for each data message to be transmitted, by processing at least part of the received messages (22), in particular by processing at least part of the arrived hello message, for example by processing at least one information regarding at least one of the respective neighbouring nodes (12, 14, 16) to which the message (22) ought to be transmitted, wherein the choice of the transmission parameters is such thatthe interference of the messages (22) is minimized andthe overall local network throughput is maximized.
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Abstract
In order to provide a communication system (100) as well as a method for communication between and among mobile nodes (10, 12, 14, 16), in particular between and among vehicles, with each node (10, 12, 14, 16)
- broadcasting at least one message (22) and
- receiving at least one arriving message (32, 34, 36) being broadcasted by at least one neighbouring node (12, 14, 16),
wherein a flexible and immediate adjustment of the transmission power in accordance with the transmitting conditions, for example with the traffic density, is guaranteed, it is proposed
(i) that the distance and/or number of the neighbouring nodes (12, 14, 16) is determined by means of the arriving messages (32, 34, 36), and
(ii) that the transmission power for broadcasting the message (22) is selected in dependence on the distance and/or number of the neighbouring nodes (12, 14, 16), in particular in dependence on the average number of nodes as determined from the respective numbers of nodes sensed by the respective neighbouring nodes (12, 14, 16).
50 Citations
13 Claims
-
1. A controller unit (40;
-
40′
), in particular a central data processing unit, for example a relay control box, for controlling communication between and among mobile nodes (10, 12, 14, 16), in particular between and among vehicles, each node (10, 12, 14, 16) being designed for receiving and transmitting messages (22), in particularat least one hello message, and/or at least one data message, for example at least one warning message, characterized by at least one decision unit (482;
482′
) for choosing, in particular for calculating, the transmission parameters, in particular both the data rate and the transmission power, for at least part of the messages (22) to be transmitted, in particular for each data message to be transmitted, by processing at least part of the received messages (22), in particular by processing at least part of the arrived hello message, for example by processing at least one information regarding at least one of the respective neighbouring nodes (12, 14, 16) to which the message (22) ought to be transmitted, wherein the choice of the transmission parameters is such thatthe interference of the messages (22) is minimized and the overall local network throughput is maximized. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 13)
at least one message analysing unit (450) being connected to the neighbour list or neighbour table (410) as well as to the receiver interface (430) and being designed for evaluating the subject and/or the type of the received messages (22), in particular for evaluating if the respective received message (22) is a hello message and/or a data message, for updating the information regarding the neighbouring nodes (12, 14, 16), in particular for updating the neighbour list or neighbour table (410), with at least part of the received messages (22), in particular with the hello message; and
/orat least one data managing unit (490;
490′
)comprising at least one data message generating unit (460;
460′
), in particular with a warning message generating unit,at least one hello message generating unit (470;
470′
), andat least one data managing unit (492;
492′
)for processing at least part of the received messages (22) and/or for triggering the data message generating unit (460;
460′
) and/or the hello message generating unit (470;
470′
) andbeing connected to the message analysing unit (450) as well as to the decision unit (482;
482′
); and
/orthe decision unit (482;
482′
)being designed for providing at least one transmission interface (420) with the messages (22) being generated by the data message generating unit (460;
460′
) and/or by the hello message generating unit (470, 470′
) andbeing connected to the neighbour list or neighbour table (410) as well as to the transmission interface (420) as well as to the data managing unit (490;
490′
).
-
40′
-
4. The controller unit (40′
- ) according to claim 3, characterized by
the neighbour list or neighbour table (410) being designed for storing at least one path loss calculation value being calculated by the controller unit (40) by subtracting the receiving power (504) from the power at which the arriving message had been transmitted, the latter power being known from at least part of the arriving message, in particular from the hello message; and
/orat least one retransmission controlling unit (440′
)being connected to the neighbour list or neighbour table (410) as well as to the message analysing unit (450) as well as to the decision unit (482′
),being designed for evaluating if the arriving message has to be retransmitted and for calculating said transmission power, in case the arriving message has to be retransmitted, and being providable with at least one copy of at least part of the received message (22), in particular of the data message, from the message analysing unit (450); and
/orat least one power control subsystem (480′
)comprising the decision unit (482′
),being connected to the neighbour list or neighbour table (410) as well as to the retransmission controlling unit (440′
) as well as to the data managing unit (490′
), andbeing designed for sorting the information regarding the neighbouring nodes (12, 14, 16) in the neighbour list or neighbour table (410) according to increasing path loss calculation values and/or for grouping the information regarding the neighbouring nodes (12, 14, 16) in the neighbour list or neighbour table (410) according to discrete path loss calculation intervals, in particular when the retransmission controlling unit (440′
) and/or the data message generating unit (460′
) and/or the hello message generating unit (470′
) request to transmit the message (22).
- ) according to claim 3, characterized by
-
5. A communication device (100) for communication between and among mobile nodes (10, 12, 14, 16), in particular between and among vehicles,
characterized by at least one controller unit (40; -
40′
) according to claim 1,at least one transmission unit (20), in particular at least one sender block, for transmitting the messages (22), in particular for broadcasting the data message and/or the hello message and/or for unicasting the data message and/or the hello message, and at least one receiver unit (30), in particular at least one receptor block, for sensing the arriving messages (22), being transmitted, in particular broadcasted and/or unicasted, by at least one of the neighbouring nodes (12, 14, 16).
-
40′
-
6. The communication device according to claim 5, characterized by
at least one power estimating unit (50) being connected to the receiver unit (30) as well as to the controller unit (40; -
40′
) andbeing designed for calculating at least one receiving power (504) at which the respective arriving message (22) is received and for providing the receiver interface (430) with the calculated receiving power (504); and
/orat least one localisation unit (60), in particular at least one G[lobal]P[ositioning]S[ystem] unit being connected to the controller unit (40;
40′
) andbeing designed for receiving signals via at least one localisation antenna (62), for instance via at least one G[lobal]P[ositioning]S[ystem] antenna, in particular regarding the current position of the respective node (10) and/or regarding the moving direction of the respective node (10); and
/orat least one car bus interface (70) being connected to the controller unit (40;
40′
) andbeing designed for supplying the controller unit (40;
40′
) with the speed of the respective node (10); and
/orat least one display unit (80) being connected to the controller unit (40;
40′
), in particular to the data processing unit (492;
492′
) andbeing designed for displaying at least one message, in particular the data message (22); and
/orat least one danger sensing unit (90) being connected to the controller unit (40;
40′
) andbeing designed for sensing at least one subject being relevant, in particular being dangerous, for the respective node (10).
-
40′
-
7. A communication system (200) for wireless L[ocal]A[rea]N[etwork]s for communication between and among mobile nodes (10, 12, 14, 16), in particular between and among vehicles,
characterized by at least two communication devices (100) according to claim 5 wherein at least one of the communication devices (100) is assigned to the reference node or respective node (10), in particular to the considered car, and at least one of the communication devices (100) is assigned to the neighbouring node (12, 14, 16), in particular to the neighbouring car. -
8. The communication system (200) according to claim 7, characterized in
that different types of messages (22) can be generated and transmitted by choosing both the data rate and the transmission power of the message (22); - and/or
that for adapting the data rate and the transmission power of the message (22) to be transmitted at least one information of path loss received by neighbouring nodes (12, 14, 16) is used; and
/orthat at least one price value is calculated based on the number of neighbouring nodes (12, 14, 16), and/or the path loss information of the neighbouring nodes (12, 14, 16), and/or the data rate of the message (22) to be transmitted, for example the transmission packet length, and/or the information about the sensitivity of modulation, and/or the probability of the loss of the message (22) to be transmitted or of loss of the packet to be transmitted, and/or the margin of the transmission power, and/or the maximum transmission power, and/or at least one threshold of channel assessment avoidance, and/or the priority of the messages (22) to be transmitted; and
/orthat the minimum price value is assigned to the minimum interfering mode, wherein a mode is referred to as a pair of data rate and transmission power; and
/orthat at least one transmitting mode being not compatible with a maximum transmission power is, in particular automatically, eliminated; and
/orthat the transmitted message (22) is retransmitted when no acknowledgement is received, by recalculating the minimum price value and by favouring the use of a higher margin of transmission power.
- and/or
-
13. Use of at least one controller unit (40;
-
40′
) according to claim 1 for at least one wireless ad hoc network, in particular for at least one sensor network or for wireless local danger warning with the ability of self-adaptation to different circumstances and scenarios, for example for car-to-car communication, wherein cars interact cooperatively and distribute for example warning messages, especially for accident-free driving, for instancein order to avoid collisions during lane change or merge maneuvers and for reporting invisible obstacles, for example obscured or shadowed objects, when vehicles are moving in different directions within the same area.
-
40′
-
9. A communication protocol for controlling communication between and among mobile nodes (10, 12, 14, 16), in particular between and among vehicles, each node (10, 12, 14, 16) being designed for receiving and transmitting messages (22), in particular
at least one hello message, and/or at least one data message, for example at least one warning message, characterized in that the transmission parameters, in particular both the data rate and the transmission power, for at least part of the messages (22) to be transmitted, in particular for each data message to be transmitted, are chosen, in particular calculated, by processing at least part of the received messages (22), in particular by processing at least part of the arrived hello message, for example by processing at least one information regarding at least one of the respective neighbouring nodes (12, 14, 16) to which the message (22) ought to be transmitted, wherein the choice of the transmission parameters is such that the interference of the messages (22) is minimized and the overall local network throughput is maximized.
Specification