Abstract: A communication system for facilitating control over a function of a vehicle (102) comprises a base station (104) positioned in the vehicle (102) and a mobile communication unit (122). The base station (104) comprises a first transmitter for transmitting a signal to the mobile communication unit (122) and a first receiver for receiving a signal from the mobile communication unit (122). The base station (104) is further configured to cause the mobile communication unit (122) to operate in accordance with a limited-response duty cycle.

Abstract: The invention relates to an access unit for communicating with a further access unit to control access to a vehicle. The access unit comprises at least a first transmitter for transmitting a polling signal; and at least a first receiver for receiving an authentication signal from the further access unit in response to the polling signal. At least the first transmitter is a first ultra-wideband transmitter and at least the first receiver is a first ultra-wideband receiver. The invention also relates to a vehicle access system which is a combination of the access and further access units. The invention also relates to methods of operating a vehicle access system and a vehicle access unit.

Abstract: The invention relates to an access unit (5; 23) for communicating with a further access unit (5; 23) to control access to a vehicle (3). The access unit (5; 23) comprises at least a first transmitter (11; 25) for transmitting a polling signal; and at least a first receiver (11; 25) for receiving an authentication signal from the further access unit (5; 23) in response to the polling signal. At least the first transmitter (11; 25) is a first ultra-wideband transmitter and at least the first receiver (11; 25) is a first ultra-wide-band receiver. The invention also relates to a vehicle access system (1) which is a combination of the access and further access units (5; 23). The invention also relates to methods of operating a vehicle access system (1) and a vehicle access unit (5; 23).

Abstract: A communication system comprises a base station (104) positioned in the vehicle (102) and a mobile communication unit (122). The base station (104) is configured to determine a first location and a second location of the mobile communication unit (122) relative to the vehicle (102), and to determine a baseline pattern of movement of the mobile communication unit (122) based at least in part on the first location and the second location. The base station (104) is also configured to determine whether a user-initiated interaction with the vehicle (102) occurs in connection with the baseline pattern of movement, and if no user-initiated interaction with the vehicle (102) occurs in connection with the baseline pattern of movement, to classify the baseline pattern of movement as an incidental pattern of movement and apply a zone adjustment to the authorization zone (138) so as to exclude to the incidental pattern of movement.

Abstract: A communication system for facilitating control over a function of a vehicle (102) comprises a base station (104) positioned in the vehicle (102) and a mobile communication unit (122). The base station (104) comprises a first transmitter for transmitting a signal to the mobile communication unit (122) and a first receiver for receiving a signal from the mobile communication unit (122). The base station (104) is further configured to cause the mobile communication unit (122) to operate in accordance with a limited-response duty cycle.

Abstract: A communication system for facilitating control over a function of a vehicle (102) comprises a base station (104) positioned in the vehicle (102) and a mobile communication unit (122). The base station (104) comprises a first transmitter for transmitting a signal to the mobile communication unit (122) and a first receiver for receiving a signal from the mobile communication unit (122). The base station (104) is configured to determine a location of the mobile communication unit (122) relative to the vehicle (102) and to cause the mobile communication unit (122) to operate in accordance with a limited-response mode when the location of the communication unit relative to the vehicle (102) remains substantially unchanged for a predetermined period of time.

Abstract: A vehicle communication system (100) comprises a base station (104) positioned in the vehicle (102) and a mobile communication unit (122). The base station (104) comprises a first transmitter for transmitting a signal to the mobile communication unit (122) and a first receiver for receiving an authentication signal from the mobile communication unit (122). The base station (104) is configured to track a position of the mobile communication unit with respect to the vehicle based on a time of flight of a communication between the mobile communication unit and at least the first transmitter and the first receiver, to receive a subsystem status signal relating to performance of a monitored vehicle (102) function and to determine, based on the subsystem status signal, a monitored function status relating to the monitored vehicle (102) function.

Abstract: A vehicle communication system (100) for facilitating control over a function of a vehicle (102) comprises a base station (104) positioned in the vehicle (102) and a mobile communication unit (122). The base station (104) comprises a first transmitter for transmitting a signal to the mobile communication unit and a first receiver for receiving a signal from the mobile communication unit (122). The base station (104) is configured to receive a first request from the mobile communication unit (122), wherein the first request seeks performance of a first vehicle function, determine a position of the mobile communication unit (122) relative to the vehicle (102), compare the position of the mobile communication unit (122) relative to the vehicle (102) to a first criteria, and facilitate performance of the first vehicle function if the position of the mobile communication unit (122) relative to the vehicle (102) satisfies the first criteria.

Abstract: The invention relates to an access unit (5; 23) for communicating with a further access unit (5; 23) to control access to a vehicle (3). The access unit (5; 23) comprises at least a first transmitter (11; 25) for transmitting a polling signal; and at least a first receiver (11; 25) for receiving an authentication signal from the further access unit (5; 23) in response to the polling signal. At least the first transmitter (11; 25) is a first ultra-wideband transmitter and at least the first receiver (11; 25) is a first ultra-wide-band receiver. The invention also relates to a vehicle access system (1) which is a combination of the access and further access units (5; 23). The invention also relates to methods of operating a vehicle access system (1) and a vehicle access unit (5; 23).