System, methods, devices and computer program products for controlling electronic appliances within a local area

A system, methods, devices and computer program products for controlling the operation of at least one electronic appliance, e.g. a TV, a music system, a lighting system, a kitchen appliance or an alarm system, located within a local area. The system has a mobile terminal located within the local area, the mobile terminal being configured to transmit a short-range radio signal to one or more short-range devices located within the local area. Each short-range device of the plurality of short-range devices located within the local area is configured to receive a short-range radio signal from the mobile terminal, perform a signal measurement of signal delay, signal strength, or both signal delay and signal strength of said short-range radio signal received from the mobile terminal, and transmit information about said measurement to an electronic apparatus. The electronic apparatus is configured to subsequently receive this information about the signal measurements from the plurality of short-range devices. In response thereto, the electronic apparatus is operable to determine the location of the mobile terminal, and control the operation of the at least one electronic appliance in dependence of the determined location of the mobile terminal.

TECHNICAL FIELD

The present invention relates in general to communication systems and, more particularly, to methods, devices, computer program products and a system for controlling one or more electronic appliances within a local area, e.g. a home or an office location.

DESCRIPTION OF RELATED ART

The digital era has digitized various electronic appliances, e.g. TV's, music systems, personal computer products (PC products), kitchen appliances e.g. microwave ovens, etc. such that the operation thereof can be centrally controlled by a computer system. In other words, the computer system becomes the central hub or control gate system for the various digital electronic appliances. Therefore, the on/off control of various digital electronic appliances can become easier and more humane for the users of such digital electronic appliances.

The avalanche of digitized electronic appliances has made it possible to create digital local areas, e.g. digital homes or digital office locations, in which the various electronic appliances are tied into a more or less seamless multimedia environment. A digital local area such as a digital home may be an entire habitat with the user right at the center. Whatever lifestyle of the user, the digital home can make the life more entertaining, more productive and more fun.

It would be desirable to control the various electronic appliances of a digital local area, e.g. the digital home, in dependence of the location of the user within the digital home. For example, it may be desirable to vary the behavior of lighting when the user enters a certain room of the home. Furthermore, it may be desirable to vary the behavior of a TV when the user enters the TV room. Still further, it may be desirable to control the behavior of a microwave oven or a refrigerator when the user is located in the kitchen.

However, there is no current method and/or system that allow for controlling various electronic appliances within a digital local area in dependence of the location of a user within said digital local area. Therefore, there is a need for providing a solution for controlling various electronic appliances in a digital local area in dependence of the location of the user. More particularly, there is a need for a solution that allows for a relatively simple, inexpensive and preferably, automatic, control of the various electronic appliances within the digital local area in dependence of the location of the user.

SUMMARY OF THE INVENTION

According to an embodiment of the invention, a system for controlling the operation of at least one electronic appliance within a local area is provided. The system comprises:a mobile terminal located within the local area and configured to transmit a short-range radio signal to a short-range device;a plurality of short-range devices within the local area, wherein each short-range device of the plurality of short-range devices is configured to receive a short-range radio signal from the mobile terminal; perform a signal measurement of signal delay, signal strength, or both signal delay and signal strength of said short-range radio signal received from the mobile terminal; and transmit information about said measurement to an electronic apparatus;an electronic apparatus configured to receive information about said signal measurement from the plurality of short-range devices within the local area; in response thereto determine the location of the mobile terminal; and control the operation of the at least one electronic appliance in dependence of the determined location of the mobile terminal.

The electronic apparatus may be configured to determine the location of the mobile terminal by comparing the different signal measurements performed by the short-range devices and based on said comparison determine which of the plurality of short-range devices is located in closest proximity to the mobile terminal.

The mobile terminal may be a portable radio communication equipment, a mobile radio terminal, a mobile telephone, a cellular telephone, a pager, a communicator, an electronic organizer, a smart phone, a computer or a headset.

According to another embodiment of the invention, a short-range device for assisting an electronic apparatus in controlling the operation of at least one electronic appliance within a local area is provided. The short-range device comprises:a receiver configured to receive a short-range radio signal from a mobile terminal located within the local area;a measurement unit configured to perform a signal measurement of signal delay, signal strength, or both signal delay and signal strength of said radio signal received from the mobile terminal; anda transmitter configured to transmit information about the signal measurement to an electronic apparatus within the local area.

The receiver may additionally be configured to receive information about at least one further signal measurement of signal delay, signal strength, or both signal delay and signal strength of a radio signal received from the mobile terminal, wherein said at least one further signal measurement is performed by another short-range device of a plurality of short-range devices within the local area; and the transmitter may additionally be configured to transmit the information about the at least one further signal measurement to the electronic apparatus within the local area.

The short-range device may be an accessory device or a stand-alone short-range device.

The short-range device may be a Bluetooth device configured to communicate short-range radio signals according to a Bluetooth technology.

According to yet another embodiment of the invention, an electronic apparatus for use with the short-range device described above for controlling the operation of at least one electronic appliance within a local area is provided. The electronic apparatus comprises:a receiver configured to receive from the short-range device information about said signal measurement;a determination unit configured to determine the location of the mobile terminal based on the received information about said signal measurement; anda controller configured to control the operation of the at least one electronic appliance in dependence of the determined location of the mobile terminal.

The determination unit may be configured to determine the location of the mobile terminal by comparing different signal measurements performed by different short-range devices of a plurality of short-range devices and determine based on said comparison which short-range device of the plurality of short-range devices is located in closest proximity to the mobile terminal.

The electronic apparatus may be configured to control the operation of the at least one electronic appliance via a wired connection or via a wireless connection.

The at least one electronic appliance may be the mobile terminal, a TV, a display screen, a music system, a speaker, a lighting system, a kitchen appliance, a home entertainment system, an alarm system, a surveillance system, a personal computer (PC), or a telephone.

According to still another embodiment of the invention, a method of controlling the operation of at least one electronic appliance within a local area is provided. The method comprises:transmitting from a mobile terminal within the local area a short-range radio signal to one or more short-range devices;receiving at a plurality of short-range devices within the local area a short-range radio signal from the mobile terminal; performing at each short-range device a signal measurement of signal delay, signal strength, or both signal delay and signal strength of said short-range radio signal received from the mobile terminal; and transmitting from each short-range device information about the signal measurement to an electronic apparatus;receiving at an electronic apparatus the information about said signal measurements performed by the plurality of short-range devices; in response thereto determining the location of the mobile terminal, and further controlling the operation of the at least one electronic appliance in dependence of the determined location of the mobile terminal.

The determining may comprise:comparing the different measurements performed by the plurality of short-range devices; anddetermining which of the plurality of short-range devices is located in closest proximity to the mobile terminal based on said comparison.

According to a further embodiment of the invention, a method of assisting in controlling the operation of at least one electronic appliance within a local area is provided. The method is performed by a short-range device and comprises:receiving a short-range signal from a mobile terminal located within the local area;performing a measurement of signal delay, signal strength, or both signal delay and signal strength of said radio signal received from the mobile terminal; andtransmitting information about the signal measurement to an electronic apparatus within the local area.

The method may further comprise:receiving information about at least one further signal measurement of signal delay, signal strength, or both signal delay and signal strength of said radio signal received from the mobile terminal, wherein said at least one further signal measurement is performed by another short-range device of a plurality of short-range devices within the local area; andtransmitting the information about the at least one further signal measurement to the electronic apparatus.

According to a still further embodiment of the invention, a method performed by an electronic apparatus for use with the previously described method for controlling the operation of at least one electronic appliance within a local area is provided. The method comprises:receiving from the short-range device information about said signal measurement;determining the location of the mobile terminal based on the received information about said signal measurement; andcontrolling the operation of the at least one electronic appliance in dependence of the determined location of the mobile terminal.

The determining may comprise:

determining the location of the mobile terminal by comparing different signal measurements performed by different short-range devices of a plurality of short-range devices and determining which short-range device of the plurality of short-range devices is located in closest proximity to the mobile terminal.

According a still another embodiment of the invention, a computer program product is provided. The computer program product comprises computer program code means for performing any of the methods described above when said computer program code means is executed by means of an electronic device having computer capabilities.

Some embodiments of the invention provide a relatively simple and, hence also inexpensive, system for controlling various electronic appliances in a digital local area in dependence of the location of the user.

It is an advantage with some embodiments of the present invention that they need not make use of fixedly installed and technically advanced sensors or detectors for controlling the operation of one or more electronic appliances. Rather, relatively simple and inexpensive short-range devices, e.g. small stand-alone Bluetooth-enabled devices, can be scattered throughout local area, e.g. an home environment. These short-range devices can be used to coarsely determine in which room of the home environment the user of the mobile telephone is located. Then, the various electronic appliances, e.g. a TV, a music system, a lighting system, an alarm system, etc., can be controlled by means of the electronic apparatus in dependence of the determined coarse location of the mobile telephone.

DETAILED DESCRIPTION OF EMBODIMENTS

FIG. 1illustrates schematically a communication system100within a local area, such as a home environment200(seeFIG. 2) in which embodiments of the invention can be implemented.FIG. 2illustrates a home environment200, which includes a living room210, a bedroom220, and a kitchen230. However, it is to be understood that embodiments of the present invention can be used in any environment, including but not limited to a home environment, an office environment, a retailer environment, etc. As shown inFIGS. 1 and 2, the system100comprises a mobile terminal110, e.g. a mobile telephone, one or more short-range devices120,121,122,123,124,125, an electronic apparatus130and one or more electronic appliances140,141,142,143. As is further disclosed inFIG. 2, the one or more short-range devices120-125are scattered throughout the home environment. For example, the one or more short-range devices120-125may be set out throughout the home environment200such that there is only one or two short-range devices121-125in each room of the home environment200. Thus, each of the scattered short-range devices120-125may be associated with a specific area, e.g. a room, of the home environment200. In one embodiment, each of the short-range devices120-125is associated with an area-ID, e.g. a room-ID.

InFIGS. 1 and 2, the mobile terminal110is embodied as a mobile telephone. Embodiments of the invention may be implemented into a wide variety of mobile terminals. The mobile terminal110may e.g. be a portable radio communication equipment, a mobile radio terminal, a mobile telephone, a cellular telephone, a pager, a communicator, an electronic organizer, a smart phone and a computer, etc. Reference will however be to a mobile telephone110below, which is only for illustrative purpose and should not be considered as limiting to the embodiments of the invention set forth herein.

The mobile telephone110, which is located within the local area200, is configured to communicate, i.e. transmit and/or receive, a short-range radio signal to and/or from one or more of the short-range devices120-125located within its short-range coverage area150. For example, the mobile telephone110may be operable to communicate short-range radio signals according to the Bluetooth® technology (operable at approximately 2.4 GHz). The Bluetooth® technology is a short-range radio technology, which makes it possible to communicate radio signals over short distances, i.e. short-range radio signals, between Bluetooth enabled devices. Using the current Bluetooth® technology, the distance between communicating Bluetooth® enabled devices may be up to 10 meters in a low power mode or as much as up 100 meters in a high power mode. The Bluetooth® technology is well-known among persons skilled in the art and will therefore not be further described herein.

The system100comprises two or more short-range devices120,121,122,123,124,125within the local area. The short-range devices may e.g. be relatively simple accessory devices and/or stand-alone short-range devices. In the disclosed embodiment, the short-range devices120-125are Bluetooth devices which are operable to communicate short-range radio signals according to the Bluetooth® technology described hereinabove. Each of these short-range devices120-125is configured to communicate short-range radio signals with other short-range devices120-125within their respective coverage area151,152,153,154,155. Each of these short-range devices120-125is also configured to communicate short-range radio signals with the mobile telephone110when the mobile telephone110is within the coverage area of the short-range device in question. Moreover, each of the short-range devices120-125is configured to communicate with the electronic apparatus130. The communication between the electronic apparatus130and each of the short-range devices120-125could be either via a wired connection or via a wireless connection. Furthermore, each of the short-range devices120-125could connect wirelessly to the electronic apparatus130by connecting to the other short-range devices120-125until reaching the electronic apparatus130. In the disclosed embodiment, the connection between the short-range device120and the electronic apparatus130is a wired connection. However, it should be appreciated that in other embodiments this connection may be a wireless connection.

It should be appreciated that the short-range devices120-125are scattered throughout the local area200. The short-range devices120-125may be scattered throughout the entire local area200in a way such that the respective coverage areas151,152,153,154, and155of the short-range devices120-125do not overlap each other completely. Further, the short-range devices120-125may be scattered throughout the local area200such that the respective coverage areas151,152,153,154, and155of the short-range devices120-125together cover most of or all of the total area of the local area200. Each of the short-range devices120-125is configured to receive a short-range radio signal from a mobile telephone, such as the mobile telephone110, when the mobile telephone110is within the coverage area of the short-range device in question. Furthermore, each of the short-range devices is configured to perform a measurement of signal delay, signal strength, or both signal delay and signal strength of the short-range radio signal received from the mobile telephone110. Still further, each of the short-range devices120-125is configured to transmit information about said measurement to the electronic apparatus130. In the disclosed example, each of the short-range devices may transmit said information to the electronic apparatus130via the short-range device that is connected to the electronic apparatus130, i.e. short-range device120(SeeFIGS. 1 and 2). In other words, each of the short-range devices120-125may transmit information about said measurement to the short-range device120that is connected to the electronic apparatus130. The information could be transmitted to this short-range device120either directly or via one or more of the other short-range devices121-125. Alternatively, the short-range devices120-125could be hooked to a Local Area Network (LAN) within the local area200and communicate directly with the electronic apparatus130via said LAN.

The electronic apparatus130is configured to receive information about signal measurements from each short-range device of the plurality of short-range devices. Based on the information from all measurements that has been performed by the various short-range devices, the electronic apparatus130is configured to determine the location of the mobile telephone110. This may e.g. be performed by comparing the different measurements made by the different short-range devices120-125and determine which of the short-range devices,120-125, is located in closest proximity to the mobile telephone110. Accordingly, information about the location of the mobile telephone110within the local area200may be determined by the electronic apparatus130. The information about the location need not be exact. It may e.g. suffice that this information is an indication of a coarse location of the mobile terminal, e.g. in which room of the home environment200the mobile telephone110is located. Since each of the short-range devices are associated with a specific local area of the home environment, e.g. a room, by determining which of the short-range devices120-125is in closest proximity to the mobile telephone110it is also possible to determine where in the home environment200the mobile telephone is located.

As described earlier hereinabove, each of the scattered short-range devices120-125may be associated with a specific area, e.g. a room, of the home environment. Thus, there may be an association between a particular short-range device and a particular room as a starting point and, hence, the closest short-range device as determined by the strongest signal strength or shortest delay gives an indication of which room the mobile terminal110is located in at the time of measurement(s). If one places short-range devices120-125such that they are not particularly near an opening to an adjacent room (doorway), this will work well. However, it appears to be possible that the electronic apparatus130, acting as a central server for the system, could over a learning period and by combining these measurements from two or more short-range devices determine that, for instance, noticing a strong measurement from short-range device123, but also noticing a slightly weaker signal from short-range device124, and at the same time not noticing a signal from short-range device121means that the mobile terminal is in fact in the room labeled220. This learning could occur either in a dedicated time period or over the normal usage of the system100. In either case, feedback will most probably be required from the user via the mobile terminal110to the electronic apparatus130making the location determination, whether a correct room is being selected. There are many learning algorithms that could be applied to this task, such as those used in gradient descent or even the less formal “neural network” categories.

In the preferred and disclosed embodiment, the electronic apparatus130is configured to act as a central server device between the various short-range devices120-125and one or more electronic appliances140,141,142, and143. It should be appreciated that the electronic apparatus130may be connected to the one or more electronic appliances140-143either via a wired connection or via a wireless connection. Furthermore, although not explicitly shown in the drawings, it would also be possible that the short-range devices120-125may, additionally, be associated with and even connected to one or more of electronic appliances140-143. For instance, short-range device125could be connected to the TV143.

Embodiments of the invention may be used for a wide variety of electronic appliances. An electronic appliance may e.g. be a TV, a music system, a lighting system, a kitchen appliance, a home entertainment system, a personal computer (PC), a telephone or even the mobile telephone110, etc. In the disclosed embodiment, the electronic apparatus130may be configured to receive the information about the determined location of the mobile telephone110from the short-range device that is connected to the electronic apparatus130, i.e. short-range device120in this example. In the disclosed embodiment, the electronic apparatus130is further configured to use this information for controlling one or more of the electronic appliances140-143in dependence thereof. Accordingly, the one or more electronic appliances140may be controlled in dependence of where in the local area200the mobile telephone110is located. It should be appreciated that the electronic appliances140-143could be controlled either separately or simultaneously by means of the electronic apparatus130.

It should be appreciated that a main purpose of some embodiments of the invention is to provide the ability to control various electronic appliances140-143within the local area200in dependence of the location of the mobile terminal110. As described earlier, the information about the location of the mobile terminal110need not be exact. It may e.g. suffice that this information is an indication of a coarse location of the mobile terminal. In fact, there are various ways of determining a coarse or arbitrary location of the mobile terminal110. In one embodiment, each of the short-range devices120-125performs a signal measurement of e.g. signal strength of a short-range signal received from the mobile terminal110. Information about this signal measurement is then sent to the electronic apparatus130. The electronic apparatus130may in turn comprise a database, a data table or the like for storing information about earlier signal measurements in the form of reference measurements. These reference measurements may either be collected during a training session or, alternatively, the system100may be adaptive and continuously learn from how the user acts together with the mobile terminal and the electronic appliances140-143. Accordingly, the electronic apparatus130may compare a currently performed signal measurement with the reference measurements stored in the electronic apparatus130and based on this information determine a coarse location of the mobile terminal110. A data table could, for example, look like this, wherein the electronic apparatus130is configured to determine a coarse location of the mobile terminal based on a signal measurement of strongest received signal strengths.

For example, when the electronic apparatus130sorts a current result as 1) Device1202) Device1233) Device121, the electronic apparatus130may determine that the mobile terminal110is located in the room labelled210.

In another example, a data table could look like this, where the electronic apparatus130is configured to sort the measurement data within thresholds. During a training period, when the data table is created by the electronic apparatus130, a user of the mobile terminal walks around the local area200with his/her mobile terminal from room by room while the short-range devices120-125continuously collect various signal strengths from the mobile terminal110as the mobile terminal110moves from one room (i.e. location) to another. Thus, the electronic apparatus130could collect signal measurement reference data over time.

The measurementThe measurementThe measurementof mobileof mobileof mobileAribtarayterminal signalterminal signalterminal signalresultingstrength atstrength atstrength atpositiondevice 120device 123device 124Room 2105-205-150-20Room 2200-510-205-15Room 2300-100-1510-20
Of course the two above-mentioned examples can be used with more type of signal measurements or with data used from both smaller or higher number of short-range devices or even from a varying number of short-range devices.

The system100according to embodiments of the invention provide for controlling the operation of one or more electronic appliance140-143within the local area200in dependence of where in the local area network200the mobile telephone110is located. When the user and the mobile telephone110of the user are in the same location (which is most often the case) location-dependent services can be provided within the local area200in dependence of where in the local area the user is currently located. Accordingly, when the user is in a particular room of the home environment200, the location of his/her mobile telephone110may trigger a change of the behavior of one or more electronic appliances in that room. For example, when it is determined that a certain short-range device122in the living room is closest to the mobile telephone, the lighting device142of the living room and the TV143of the living room may be switched on. As another illustrative example, when it is determined that another certain short-range device124in the kitchen is closest to the mobile telephone110, one or all of the music system140of the kitchen, the kitchen appliances141, and the lighting device142of the kitchen may be turned on.

Embodiments of the invention may be employed in different scenarios, some of which will now be explained. One such scenario involves a music service, which provides the user of mobile telephone110with music as the user moves around in the home environment200. If there is provided a music system140with a loudspeaker in each of the rooms of the home environment200, the music may follow the user when the user moves from one room to another. Accordingly, when the user bringing his/her mobile telephone110with himself/herself enters a new room, e.g. the bedroom, the audio of the music system may be transferred to that room and simultaneously turned off in the previously left room, e.g. the living room.

Another scenario involves a lighting service, which provides the user of mobile telephone110with lighting as the user moves around in the home environment200. If there is provided a lighting system142in the local area with lighting devices in each of the rooms of the home environment200, the lighting may follow the user when the user moves from one room to another. Accordingly, when the user bringing his/her mobile telephone110with himself/herself enters a new room, e.g. the kitchen, the light may be turned on in that room and simultaneously turned off in the previously left room, e.g. the living room.

Still another scenario involves an alarm service. For example, when it is determined that the user moves away from the coverage area of all short-range devices of the home environment200this could trigger the activation of an alarm system to prevent burglary.

Yet another scenario involves personalizing various services in dependence of who the user is. For example, the music service described above can be personalized in dependence of who is in the room. As another example, the displaying of information on various electronic appliances, e.g. the TV, may be changed in dependence of who is in the room. For example, it would be possible to associate a profile or set of profiles, either at electronic apparatus130or associated with each electronic appliance140-143or even communicated from the mobile telephone110. Hence, the correct profile, i.e. the one associated with a particular phone110and its associated user, would be set in the electronic appliance to, for instance, cause a subset of music to be played, or a subset of TV channels to be available on TV143, or preferred light level to the set. The profiles are communicated or otherwise activated in the electronic appliances in the room in which the user with his/her mobile telephone110is presently in.

In still a further scenario, embodiments of the present invention may be utilized for a plurality of mobile terminals, e.g. mobile telephones, simultaneously. This could provide for a system where multiple mobile terminals cause multiple operations at various locations of the local area, e.g. the home environment200. For example, as explained above, multiple users with multiple mobile telephones110, could be associated with profiles for each electronic appliance and for each user (or more correctly each mobile telephone of the user). For example, there could be an a priori ranking of profiles (e.g. mobile telephone associated with father has a higher priority than that of the son or daughter but not that of the wife).

In the following, the various components of the system100will be described separately in some more detail.

FIG. 3Aillustrates an embodiment of the mobile telephone110illustrated inFIGS. 1 and 2. The mobile telephone110typically comprises a user interface for interacting with and operating the mobile telephone110. The user interface may comprise a loudspeaker301, a microphone302, a keypad303, and a display304. Moreover, the mobile telephone110comprises a built-in antenna (not shown) for receiving/transmitting signals to and from a telecommunication network (not shown) through which the mobile telephone110can communicate with other mobile terminals. According to embodiments of the invention, the mobile telephone110may also use the antenna to communicate short-range radio signals, e.g. according to the Bluetooth® technology, to and/from short-range devices120-125. The structure and operation of a mobile telephone is well-known to persons skilled in the art and will therefore not be further explained here.

FIG. 3Billustrates an embodiment of a short-range device120-125shown inFIGS. 1 and 2. In the disclosed embodiment, a short-range device comprises a transceiver305, a controller such as a Central Processing Unit (CPU)306, a measurement unit307, and a memory308.

The transceiver305is configured to communicate, via an antenna (not shown), short-range signals with other short-range devices and/or with the mobile terminal110. The short-range radio signals may e.g. be communicated according to the Bluetooth® technology.

The transceiver305includes a receiver configured to receive a short-range radio signal from a mobile terminal110located within the local area200. Furthermore, the short-range device includes a measurement unit307, which is configured to perform a signal measurement of signal delay, signal strength, or both signal delay and signal strength of said received radio signal. The transceiver305further includes a transmitter configured to transmit information about the signal measurement to an electronic apparatus within the local area. The electronic apparatus will be described in further detail below.

In the disclosed embodiment, the receiver of the transceiver305is additionally configured to receive information about at least one further signal measurement of signal delay, signal strength, or both signal delay and signal strength of a radio signal received from the mobile terminal, wherein said at least one further signal measurement has been performed by one or more other short-range device of the plurality of short-range devices.

The measurement unit307may be implemented by means of a separate hardware component, such as a processor, an ASIC (Application Specific Integrated Circuit) or an FPGA (Field programmable Gate Array). Alternatively, the measurement unit307is implemented as a software component, i.e. software program code means, which may be run by controller306or a separate processor. The program code means may e.g. be stored in memory308. The measurement unit307could also be implemented as a combination of a software and hardware component.

FIG. 3Cillustrates an embodiment of the electronic apparatus130shown inFIGS. 1 and 2. In the preferred and disclosed embodiment, the electronic apparatus130acts as a central server device between the short-range devices120-125and the electronic appliances140-143to be controlled. The electronic apparatus130includes a receiver309for receiving, from the one or more of the short-range devices120-125, information about signal measurement performed by the one or more short-range devices120-125. As is illustrated inFIG. 3B, the electronic apparatus130also comprises a determination unit310. The determination unit configured to determine the location of the mobile terminal by comparing different signal measurements performed by the one or more short-range devices120-125. Based on this, the determination unit310is operable to determine which of the plurality of short-range devices120-125is located in closest proximity to the mobile terminal110(which is located within the local area200). The electronic apparatus130further includes a controller, e.g. a Central Processing Unit (CPU),311together with an associated memory312for storing application software, databases and data to be transmitted to electronic appliances140-143. According to embodiments of the invention, the controller is configured to control the operation of one or more electronic appliance140-143in dependence of the determined location of the mobile terminal, as described earlier.

The determination unit310may be implemented by means of a separate hardware component, such as a processor, an ASIC (Application Specific Integrated Circuit) or an FPGA (Field programmable Gate Array). Alternatively, the determination unit310is implemented as a software component, i.e. software program code means, which may be run by controller311or a separate processor. The program code means may e.g. be stored in memory312. The determination unit310may also be implemented as a combination of a software and hardware component. The determination unit310may also be implemented as a combination of a software and hardware component.

In the following, a method of controlling the operation of one or several electronic appliances140-143within a local area will be described in some more detail.

FIG. 4illustrates a method of controlling the operation of one or several electronic appliances140-143within a local area, according to an embodiment of the invention. In step401, a short-range radio signal (e.g. according to the Bluetooth® technology) is transmitted from a mobile telephone110to one or several short-range devices120-125, which are located within the local area, e.g. home200.

In a step402, a short-range radio signal transmitted from the mobile telephone110is received at one or several short-range devices120-125. Then, in a step403, a signal measurement of signal delay, signal strength, or both signal delay and signal strength of said short-range radio signal received from the mobile telephone110is performed by each of the short-range devices that received the short-range radio signal from the mobile telephone110. In a further step404, information about the signal measurement is transmitted from each short-range device to the electronic apparatus130.

In a step405, the information about the signal measurements performed by each of the plurality of short-range devices is received at the electronic apparatus130. In response thereto, the location of the mobile terminal110can be determined, in step406, by means of the electronic apparatus130. The determination in step406may comprise comparing the different measurements performed by the plurality of short-range devices, and in response determining which of the plurality of short-range devices is located in closest proximity to the mobile terminal. Finally, in a step407, the operation of one or more electronic appliance in the local area, e.g. home200, is controlled by the electronic apparatus130in dependence of where in the local area the mobile terminal (and, hence, in most cases where the user) is positioned.

The present invention has been described above with reference to specific embodiments. However, other embodiments than those described are possible within the scope of the invention. For example, embodiments of the present invention have mainly been described with reference to short-range devices in the form of Bluetooth devices. However, other short-range devices such as e.g. WiFi access points or the like scattered throughout the local area could equally possible be used for the same or a similar purpose. Moreover, the detailed description has referred to various scenarios in which embodiments of the present invention may be implemented. However, the skilled man would recognize that other scenarios than those described are also possible within the scope of the invention. Different method steps than those described above, performing the method by hardware or software or a combination of both hardware and software may be provided within the scope of the invention. The different features and method steps of the invention can be combined in other combinations than those described. The invention is only limited by the appended claims.