Wireless communicationsystem

The invention relates to a wireless data transmission system according to the preamble of claim 1.

DE PS 40 03 410 C2 is a data transmission system known. This known system comprises a read-write unit with a data transmitter, a data receiver, a memory and an input unit and a detector plate with a data transmitter, a data receiver and a memory. The data transmitter of the read-write unit is simultaneously formed as a energy transmitter and transmits the operation to the of the detector necessary energy to an energy receiver on the detector plate.

The detector plate and the read-write unit can both mobile or one of the two components can mobile and others are operated stationary. When used in an access control may arranged the writing-reading unit stationary be and connected to a door opener. The power supply the read-write unit and the door opener are made the low-voltage grid. The detector plate are of persons allowed access supported. Once a detector plate in the vicinity of an antenna of the read-write unit is placed, whose data are read from the write unit read and checked for validity. In validity of Strike released. By writing to the memory of Detector plate can data and thus access permissions be changed.

In case of power failure, the data transmission system is Out of service. The door can then only by a conventional mechanical key to open what but the security against manipulation possibilities diminish. Through battery operation or buffer operation can with regular Maintenance Although the consequences of sudden, unexpected power outages be eliminated, with lack of maintenance this protection against power failures but lost again.

The invention is based on the object at a wireless Data transmission system, the reliability and security against manipulation to improve.

This object is achieved in a wireless communication system according to the preamble of claim 1 by the characterizing in Part specified characteristics solved. developments and advantageous embodiments of the invention will be apparent from the dependent claims.

In the solution according to the invention, the receiving means be installed or housed tamperproof because the power supply of all components, ie including done the sensor and / or actuator by wireless means and thus can always be ensured from the outside. The functional reliability is characterized so high that emergency measures to Bridging of disorders equilateral but also the would impair manipulation safety, omitted can.

provide for the energy supply of the sensor and / or actuator There are several options. Thus, the energy receiver a include temporary energy storage, the energy transfer of the sensor device to the receiving device is rechargeable and briefly the power supply of the sensor and / or actuator takes over.

In this solution, the energy transfer does not have the same carried out with the operation of the sensor and / or actuator. also is possible at a low average Energy flow for power receiver briefly increased energy needs.

On the other hand, the energy supply of the sensor and / or Actuator solely by wireless power transmission during the operation carried out.

This solution does not require energy storage that spatial Benefits offers. However, the wireless energy flow must also the peak demand during the operation of the sensor and / or actuator can cover, so that the corresponding Eneregiesender powerful must be designed.

Alternatively, a combination of both aforementioned solutions also be provided that the energy supply of the sensor and / or actuator both by wireless power transmission during its operation and by buffering by a temporary energy store takes place, the wireless by is energy transfer chargeable.

In this solution, the energy storage may be less than the first variant are measured, because it only for Bridging is needed of energy peaks.

The energy transmitter may, together with the data transmitter and data receiver combines the transmitter arrangement or as a separate be designed device.

Depending on the required power output of the power station and the fact whether a wireless power transmission in general made or only in case of failure of the regular power supply to which one or the other variant can be selected will. When the power station with the data transmitter and will combine data receiver of the transmitter arrangement, increases its weight and size, while in the other case, although in Normally, the handling of the transmitter arrangement is simple, in case of power failure but an additional device is required.

The receiving means may comprise a decoder which upon request from the control unit of the receiving device of the transmitter arrangement Autentifikationsdaten sent evaluates and validity of Autentifikationsdaten memory and / or sensor and / or actuator releases.

This measure increases the safety against tampering, by among sender units that for the transmission protocol data transmission to the receiving device and back control, selectively authorizations can be granted, which are interrogated by the receiving device. The permissions can be by changing the memory contents also change.

In a further development, both in the memory of the transmitter arrangement and in the memory of the receiving device Autentifikationsdaten be stored. Furthermore, both in the transmitter arrangement and in the receiving device decoder be provided by means of the mutually on request transmitted Autentifikationsdaten validity are verifiable. It may be a bi-directional data exchange take place between transmitter arrangement and receiving device and only when validity of both the Autentifikationsdaten Memory of the receiving device and / or the sensor and / or the actuator are released.

The tampering is thereby further increased. If the attempt is made, the Autentifikationsdaten to identify by "listening" to the data communication and thus to decrypt the code, this is achieved by Assignment difficulty several Autentifikationsdaten significantly difficult.

A further increase in tampering results when in at least one of the memory of the transmitter arrangement or the receiving device variable Autentifikationsdaten and at least in the other memory of the receiving device or the sensor device a test algorithm are stored, by means of the memory for the Autentifikationsdaten associated decoder, the back and by the Check algorithm changes transmitted back Autentifikationsdaten be checked for validity and only if it is valid both Autentifikationsdaten the memory of the receiving device and / or the sensor and / or actuator released will. The test algorithm can exclusive ID numbers of Communication legitimate partners from donor arrangements Include and receiving units.

Since the transferred Autentifikationsdaten constantly changing be and the key code stored in, but not transmitted test algorithm infected, would an "interception" of Data communication only few data transfer actions are no longer sufficient to decrypt the code.

Preferably, in the memory of the transmitter arrangement and / or the receiving device log data of the carried data communication and Autentifikationsdaten stored. Thus, the Encoder assembly track which receiving devices were operated and the receiving device can can log, which donors carried out the Autentifikationsprozeß have.

This data transfer operations can not trace back and so attempts to manipulate but also abuse of legitimate Devices discover.

The invention will be explained in more detail with reference to the drawing.

In the drawings:<dl tsize="7"><dt>Fig. 1</dt><dd>a block diagram of a transmitter arrangement,</dd><dt>FIG. 2</dt><dd>a block diagram of a receiving device,</dd><dt>Fig. 3</dt><dd>an embodiment of a transmitter arrangement and</dd><dt>Fig. 4</dt><dd>an embodiment of a receiving device.</dd></dl>

Donors arrangement illustrated as a block diagram in Fig. 1 10 comprises a data transmitter 14 which also at the same time as Energy transmitter 34 serves, a data receiver 16, a memory 20, a keyboard 44, a display 46, a control unit 18, a power source 48, and a the same time as Transmission and reception antenna serving resonant circuit 50. About the resonant circuit 50 are data and power to the receiving device 12 and transmitted from the receiving device 12 derived data received. The control of the data transmitter 14 and data receiver 16 and the memory 20, the display and the keyboard is performed by the control unit 18. The Control unit 18 also takes over the function of a Decoder 40 for checking the validity of received Data. The memory 20 is divided into a rewritable Region and a non- or-once Area where an exclusive ID number of Encoder assembly 10 is stored.

The receiving device shown as a block diagram in Fig. 2 12 has partially similar functional blocks as the prescribed transmitter arrangement 10. Thus, even when the receiving device 12, a data transmitter 24, a data receiver 22, a memory 28, a control unit 26, and simultaneously as transmitting and receiving antenna serving resonant circuit 52 available. The data receiver 22 at the same time forms an Energy receiver 36. About the resonant circuit 52 are data transmitted to the sensor device 10 and of the sensor device received 10 derived data and energy. The control of the Data transmitter 24 and data receiver 22 and the memory 28 is carried out by the control unit 26 also declines Control unit 26, the function of a decoder 42 for testing the validity of the received data. Also, the memory 28 is divided into a rewritable area and a non- or-once area in which a exclusive ID number of the receiver 12 is stored is. In addition, a temporary energy storage 38 to be available.

In addition, the receiver 12 is connected to an actuator 32 and a sensor 30 is connected. The actuator 32 and the sensor 30 are controlled by the control unit 26th The power supply the actuator 32 and the sensor 30 takes place wirelessly from the Transmitter arrangement 10 to the receiving device 12th

Fig. 3 shows an embodiment of a transmitter arrangement 10. The in FIG. 1 described function blocks are here in a common housing. Externally visible is the Display 46 and the keyboard 44. In addition, a range recognizable, which houses the coil 54 of the resonant circuit 50 is. The coil 54 is dimensioned in this case so that the energy for operating the sensor 30 and actuator 32 of the Receiving means 12 can be transmitted.

Fig. 4 shows an embodiment of a receiving device 12, the tamperproof incorporated herein in a container 56 is. The receiving device 12 includes the functional blocks from FIG. 2, and further an actuator 32 and a sensor 30. The Sensor 30 may be formed for example as a temperature sensor be to raise the temperature in the interior of a container 56 or to detect and monitor the container from the outside. Of the Actuator 32 is designed here as a motor bolt to the door mechanically to lock and unlock, without requiring a mechanical Key is required. As part of the receiving device 12, the coil 58 of the resonant circuit 52 seen which in size to approximately the size of the coil 54 in the transmitter arrangement 10 matched. In this way, an optimum Coupling and thus maximum energy transfer guaranteed.

The application of the incorporation of the receiving device described here 12 in a container 56 is especially predestined for the invention, because the receiving device 12, exceptions, not the low-voltage grid can be supplied with power and battery operated there is no guarantee that necessary maintenance be carried out on schedule.

In the embodiment according to the invention is both the energy to operation of the functional blocks of the receiver 12 as well as to operate the sensor 30 and the actuator 32 wirelessly transfer. The lock can thus only by a transmitter arrangement be 10 opened, which is authorized to do so. A mechanical Opening without using the encoder assembly 10 is not possible or only by destroying the container 56th This ensures high safety results give manipulations.

To protect against tampering with not shared donor arrangements, but dominate the used transmission protocol, can proceed as follows.

The exclusive ID numbers of donor arrangements and receiving devices, in a non-writable or only write-once memory area 60; 62 stored, are used to determine which donor arrangements and reception facilities admitted as a partner for mutual communication are. For this, the ID numbers of the permissible are Partners in the rewritable storage area 64; 66 of other partners filed. If the sensor device 10 electromagnetically is coupled to a receiver 12 and the functional blocks of the receiver 12 with energy are supplied and put into operation, is initially an exchange of Autentifikationsdaten.

submit In a particularly tamper-proof method the transmitter arrangement 10 and the receiver 12 today Autentifikationsdaten, by a test algorithm be modified and transferred back. Since the test algorithm known to both devices, can the validity of the Autentifikationsdaten be verified without it by listening succeeds to decrypt the Autentifikationsdaten. The Autentifikationsdaten be with each new transmission changed. The test algorithm can be affected by the ID numbers will. Only when the coupled device the validity of Autentifikationsdaten have determined is the memory 28 and the actuator 32 and the sensor 30 released by the control unit 26 of the receiving device 12th