Method and apparatus for finding a HVAC field device

Abstract

A method for finding a HVAC field device (1A, 1B, 1C, 1D) using a mobile device (2), the method comprising the steps of: exchanging ultra-wideband signals between the HVAC field device (1A, 1B, 1C, 1D) and the mobile device (2); determining, in at least one processing unit, positioning information related to a position of the HVAC field device (1A, 1B, 1C, 1D), using transmission properties of the ultra-wideband signals; receiving, in the processing unit, device information of the HVAC field device (1A, 1B, 1C, 1D) from the HVAC field device (1A, 1B, 1C, 1D); providing, to the mobile device (2) by the processing unit, the device information and the positioning information; and displaying, on a display (25) of the mobile device (2), the device information and the positioning information for finding the HVAC field device (1A, 1B, 1C, 1D).

Description

[0001] METHOD AND APPARATUS FOR FINDING A HVAC FIELD DEVICE

[0002] FIELD OF THE DISCLOSURE

[0003] The present invention relates to a method and apparatus for finding a HVAC field device.

[0004] BACKGROUND OF THE DISCLOSURE

[0005] Heating, Ventilation, and Air Conditioning (HVAC) systems are used to control environmental conditions in a facility, in particular the temperature in human accessible spaces. However, HVAC systems can also control other (or more specific) environmental conditions, such as air temperature, air humidity, air flow, air quality (for example related to carbon dioxide (CO2) content, air pollution), room temperature, and / or water temperature. To this end, the HVAC system of a facility typically has heaters, coolers and / or pumps, which condition the HVAC fluid(s) (i.e., liquids and / or gasses) and provide for transportation of the fluid throughout the facility. Additionally, the HVAC system includes HVAC field devices which are often located directly within, or adjacent to, human-accessible spaces of the facility, such as rooms, halls, corridors, entryways, etc., such as to allow the environmental conditions in these human accessible spaces to be measured and regulated accurately.

[0006] To that end, HVAC field devices are typically equipped with sensors relevant to sensing environmental values related to HVAC and / or actuators relevant for controlling the operation of the HVAC system. Some HVAC field devices may, however, not have any sensors or actuators, such as HVAC control units which receive user input related to the operation of the HVAC system or display information related to the HVAC system. The HVAC field devices need to be physically installed at their planned position in the facility. This typically occurs when the facility is built or renovated. The HVAC field devices may be connected to power mains of the facility during installation, however it is not a given that the physical installation of the HVAC field device occurs at the same as the electric connection. The HVAC field devices are typically configured with configuration parameters such that they may function as intended as part of the HVAC system. These configuration parameters are typically programmed into the device after installation. According to the prior art, a temporary data connection with a configuration device is established, for example using NFC. The technician, referring to an HVAC system plan, searches for and locates each HVAC device in turn, configuring each device individually via NFC. Configuration using NFC is cumbersome as the technician using the configuration device must place the configuration device in close proximity with the HVAC field device. At least some of the aforementioned steps take place during commissioning of the HVAC system, in which a technician conducts a check and review of the HVAC field devices, verifying that the correct HVAC field devices have been installed in the correct location, is configured appropriately, and operates properly. Commissioning can further include testing, adjusting, and balancing of the HVAC system. During the above mentioned processes, each HVAC field device may have to be located and physically accessed multiple times, which costs a lot of time as the technician must refer to the HVAC system plan each time. Depending on the precise location of where the HVAC field device is installed, it may not be simple to visually identify the precise installation location.

[0007] Another issue relates to finding HVAC field devices which were previously installed, for example for (re-)configuration, maintenance, repair, or replacement. As HVAC field devices may be hidden from view, or the view may be obstructed, for example behind a wall or above a dropped ceiling, the technician must consult a building plan, building information model (BIM), and / or HVAC system plan to find the devices. Further, if a particular room or zone in the building includes a large number of HVAC devices, it may take time to positively identify the correct particular HVAC field device. If the building plan is not (or no longer) accurate, the time for finding an installed HVAC device can be considerable. Problems also arise if the HVAC device is not installed at the correct location, as the technician may waste a lot of time looking for the device and, when found, confirming it is indeed the correct device.

[0008] SUMMARY OF THE DISCLOSURE

[0009] It is an object of the invention and embodiments disclosed herein to provide a method and apparatus for finding a HVAC field device. Particular embodiments are suitable for finding an installed HVAC field device, for example for configuration, commissioning, testing, repair, and / or replacement. Particular embodiments are suitable for finding an uninstalled HVAC field, the uninstalled HVAC field device not yet physically fixed at its intended installation location and / or not yet electrically connected to an electrical system of a facility.

[0010] In particular, it is an object of the invention and embodiments disclosed herein to provide a method and apparatus for finding a HVAC field device which does not have at least some of the disadvantages of the prior art, in particular in that it allows for more efficient finding.

[0011] The present disclosure relates to a method and apparatus for finding a HVAC field device. The method comprises exchanging ultra-wideband signals between the HVAC field device and the mobile device. The method comprises determining positioning information related to a position of the HVAC field device, using transmission properties of the ultra-wideband signals. The method comprises receiving, in the mobile device, device information of the HVAC field device from the HVAC field device. The method comprises displaying, on a display of the mobile device, the device information and the positioning information for finding the HVAC field device.

[0012] In an embodiment, the method comprises transmitting, from the mobile device to the HVAC field device, configuration parameters for the HVAC field device.

[0013] In an embodiment, the method comprises exchanging ultra-wideband signals between each of a plurality of HVAC field devices and the mobile device. The method comprises determining positioning information for each of the plurality of HVAC field devices. The method comprises receiving, in the mobile device, device information of the HVAC field devices from the HVAC field devices. The method comprises receiving, in the mobile device via a user interface, information that identifies a particular HVAC field device. The method comprises displaying, on a display of the mobile device, the device information and the positioning information of the particular HVAC field device for finding the particular HVAC field device.

[0014] In an embodiment, the method comprises transmitting, from the mobile device to the particular HVAC field device, configuration parameters for the particular HVAC field device.

[0015] In an embodiment, the method comprises receiving, in the mobile device, mapping information of at least part of a facility in which the HVAC field device(s) is situated. The method comprises rendering, in the mobile device, a map using the mapping information. The method comprises displaying, on the display of the mobile device, the map and positions of the HVAC field device(s) on the map, using the positioning information of the HVAC field device(s). In an embodiment, the method comprises determining a current location of the mobile device. The method comprises displaying, on the display of the mobile device, the current location of the mobile device on the map.

[0016] In an embodiment, the method further comprises receiving, in the HVAC field device, ultra-wideband signals from a further HVAC field device, the further HVAC field device not being in direct communication range with the mobile device. The method comprises forwarding, by the HVAC field device, the ultra-wideband signals received from the further HVAC field device to the mobile device.

[0017] In an embodiment, a first set of the plurality of HVAC field devices are associated with a first mesh network and a second set of the plurality of HVAC field devices are associated with a second mesh network. The first mesh network and the second mesh network are not directly communicatively connected. Exchanging ultra-wideband signals between each of a plurality of HVAC field devices and the mobile device comprises receiving, in the mobile device, a first ultra-wideband message from a first HVAC field device of the first set. The ultra-wideband message includes a message header and a message body. The method comprises identifying, in the mobile device, by inspecting the message header, whether the ultra-wideband message is a mesh network broadcast message. The method comprises generating, in the mobile device, a second ultra- wideband message including the message header and the message body from the first ultra-wideband message, the message body further configured to include positioning information of the first HVAC field device. The method comprises transmitting, using the mobile device, the second ultra-wideband message to a second HVAC field device of the second set.

[0018] In an embodiment, the method comprises receiving, in the mobile device, from a server via a wireless communications network, a data package, the data package including the configuration parameters for the HVAC field device. The method comprises storing, in the mobile device, the data package. The method comprises transmitting, from the mobile device to the HVAC field device, the data package. In one embodiment, the server is a cloud-based server. In another embodiment, the server is a server based locally.

[0019] In an embodiment, exchanging ultra-wideband signals comprises transmitting, from the mobile device to the HVAC field device, an ultra-wideband request message. The method comprises receiving, in the HVAC field device, the ultra-wideband request message. The method comprises generating, in the HVAC field device, an ultra-wide- band response message, in a pre-determined processing time. The method comprises receiving, in the mobile device from the HVAC field device, the ultra-wideband response message. According to this embodiment, determining the positioning information comprises calculating at least one distance between the mobile device and the HVAC field device using a time difference between transmission of the request message and reception of the response message and the pre-determined processing time. Additionally or alternatively, determining the positioning information comprises calculating at least one angle between the mobile device and the HVAC field device using a phase difference of arrival, the phase difference of arrival calculated using the reception of the request message and / or the reception of the response message.

[0020] In an embodiment, exchanging ultra-wideband signals comprises transmitting, from the HVAC field device to the mobile device, an ultra-wideband request message. The method comprises receiving, in the mobile device, the ultra-wideband request message. The method comprises generating, in the mobile device, an ultra-wideband response message, in a pre-determined processing time. The method comprises receiving, in the HVAC field device from the mobile device, the ultra-wideband response message. According to this embodiment, determining the positioning information comprises calculating at least one distance between the HVAC field device and the mobile device using a time difference between transmission of the request message and reception of the response message and the pre-determined processing time. Additionally or alternatively, determining the positioning information comprises calculating at least one angle between the HVAC field device and the mobile device using a phase difference of arrival, the phase difference of arrival calculated using the reception of the request message and / or the reception of the response message.

[0021] In an embodiment, the mobile device includes two or more ultra-wideband antennas and the method comprises receiving, in the mobile device from the HVAC field device, the ultra-wideband response message by the two or more ultra-wideband antennas of the mobile device. The method comprises calculating a distance between the HVAC field device and each of the ultra-wideband antennas and / or at least one angle between the mobile device and the HVAC field device. Additionally or alternatively, the method comprises calculating a distance between the HVAC field device and at least one of the ultra- wideband antennas of the mobile device, and calculating one or more angles (i.e. including an elevation angle and / or an azimuthal angle) of the ultra-wideband response message. The angles are calculated using, for example, a phase difference of arrival of the ultra-wideband response message. The method comprises determining the positioning information as a two-dimensional or three-dimensional relative position between the mobile device and the HVAC field device using the calculated distance(s) and / or the calculated angle(s).

[0022] In an embodiment, the HVAC field device includes two or more ultra-wideband antennas and the method comprises receiving, in the HVAC field device, the ultra-wideband request message by each of the ultra-wideband antennas. The method comprises cal- culating a distance between the mobile device and each of the ultra-wideband antennas and / or at least one angle between the HVAC field device and the mobile device. Additionally or alternatively, the method comprises calculating a distance between the mobile device and at least one of the ultra-wideband antennas of the HVAC field device, and calculating one or more angles (i.e. including an elevation angle and / or an azimuthal angle) of the ultra-wideband request message. The angles are calculated using, for example, a phase difference of arrival of the ultra-wideband request message. The method comprises determining the positioning information as a two-dimensional or three-dimensional relative position between the mobile device and the HVAC field device using the calculated distance(s) and / or the calculated angle(s).

[0023] In an embodiment, the method further comprises receiving, in the mobile device, positioning information and device information of further HVAC field devices from a server. The method comprises determining a current location of the mobile device. The method comprises displaying, on a display of the mobile device, the positioning information and the device information of at least one of the further HVAC field devices using the current location. In one embodiment, the server is a cloud-based server. In another embodiment, the server is a server based locally.

[0024] In an embodiment, the mobile device includes a range imaging sensor and the method further comprises generating, in the mobile device, a three-dimensional model of at least part of the surroundings of the mobile device, using data received from the range imaging sensor. The method comprises displaying, on the display of the mobile device, the three-dimensional model, the three-dimensional model having an overlaid indicator of a position of the HVAC field device.

[0025] In addition to a method, the present disclosure also relates to a HVAC system including a HVAC field device and a processing unit, wherein the HVAC field device comprises an ultra-wideband communications module configured to exchange ultra-wideband signals with a mobile device. The processing unit is configured to determine positioning information related to a position of the HVAC field device, using transmission properties of the ultra-wideband signals. The processing unit is configured to receive device information of the HVAC field device from the HVAC field device. The processing unit is configured to provide to the mobile device the device information and the positioning information.

[0026] In an embodiment, the HVAC system includes the mobile device. The mobile device is configured to display, on a display of the mobile device, the device information and the positioning information for finding the HVAC field device.

[0027] In an embodiment, the processing unit is integrated into the HVAC field device.

[0028] In an embodiment, the processing unit is arranged in a gateway device and communicatively coupled to the HVAC field device.

[0029] In an embodiment, the processing unit is arranged in the mobile device.

[0030] In an embodiment, the processing unit is arranged in a server and is communicatively coupled to the HVAC field device. The server may be a cloud-based server. In another embodiment, the server is a server based locally.

[0031] In an embodiment, the HVAC field device comprises two or more ultra-wideband antennas. The processing unit is configured to receive, in the HVAC field device, an ultra- wideband request message by each of the ultra-wideband antennas. The processing unit is configured to calculate, in the processing unit, at least one distance between the mobile device and at least one of the ultra-wideband antennas, respectively, or at least one angle between the HVAC field device and the mobile device using a phase difference of arrival of the request message at the two or more ultra-wideband antennas of the HVAC field device. The processing unit is configured to determine the positioning information as a two-dimensional or three-dimensional relative position between the mobile device and the HVAC field device using the calculated distance(s) and / or the calculated angle(s).

[0032] In an embodiment, the HVAC system comprises a plurality of HVAC field devices configured to establish an ultra-wideband mesh communication network and exchange ultra-wideband signals between the plurality of HVAC field devices. The processing unit is further configured to determine, using transmission properties of the ultra-wideband signals exchanged between the plurality of HVAC field devices, distances and / or angles between pairs of the plurality of HVAC field devices. For example including a distance between a particular HVAC field device and at least one other HVAC field device and / or an angle between the particular HVAC field device and at least one other HVAC field device. The processing unit is configured to receive, from each HVAC field device, device information. The processing unit is configured to generate a two-dimensional or three-dimensional spatial arrangement of the HVAC field devices using the distances. The processing unit is configured to determine positioning information of the plurality of HVAC field devices further using transmission properties of the ultra-wideband signals exchanged between the plurality of HVAC field devices and the mobile device and the spatial arrangement. The processing unit is configured to transmit, to the mobile device, the positioning information and the device information of the plurality of HVAC devices.

[0033] In addition to a method and system, the present disclosure also relates to a computer program product comprising computer program code configured to control a processing unit, in particular a processing unit of an HVAC system as described herein, to perform a method as described herein.

[0034] In an embodiment, the computer program code is stored on a non-transitory computer readable medium. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The herein described disclosure will be more fully understood from the detailed description given herein below and the accompanying drawings, which should not be considered limiting to the invention described in the appended claims. The drawings in which:

[0036] Fig. 1 shows a diagram illustrating schematically a building; Fig. 2 shows a diagram illustrating schematically a side-on view of a part of a floor of a building having multiple installed HVAC field devices;

[0037] Fig. 3 shows a diagram illustrating schematically a top-down view of a part of a floor of a building having multiple installed HVAC field devices;

[0038] Fig. 4 shows a block diagram illustrating schematically a HVAC field device; Fig. 5 shows a block diagram illustrating schematically a mobile device;

[0039] Fig. 6 shows a flow diagram illustrating an exemplary sequence of steps for finding a HVAC field device;

[0040] Fig. 7 shows a flow diagram illustrating an exemplary sequence of steps for determining positioning information of a HVAC field device; Fig. 8 shows a flow diagram illustrating an exemplary sequence of steps for determining positioning information of a HVAC field device;

[0041] Fig. 9 shows a flow diagram illustrating an exemplary sequence of for finding a particular HVAC field device amongst multiple HVAC field devices;

[0042] Fig. 10 shows a flow diagram illustrating an exemplary sequence of optional additional steps for finding a HVAC field device, in particular for displaying a map;

[0043] Fig. 11 shows a flow diagram illustrating an exemplary sequence of optional additional steps for finding a HVAC field device, in particular for displaying a current location of the mobile device on the map;

[0044] Fig. 12 shows a flow diagram illustrating an exemplary sequence of steps for bridging separate mesh networks using a mobile device;

[0045] Fig. 13 shows a flow diagram illustrating an exemplary sequence of steps for forwarding a data package comprising configuration parameters from the cloudbased server to the HVAC field device;

[0046] Fig. 14 shows a flow diagram illustrating an exemplary sequence of steps for automatic interaction between an HVAC field device and a mobile device;

[0047] Fig. 15 shows a flow diagram illustrating an exemplary sequence of steps for receiving positioning information and device information of further HVAC field devices and displaying this information on the mobile device;

[0048] Fig. 16 shows a schematic representation of a technician in possession of a mobile device in a facility with multiple HVAC field devices in communication range

[0049] Fig. 17 shows a schematic representation of a display of a mobile device displaying both a device map and a device list; Fig. 18 shows a schematic representation of a display of a mobile device displaying both a device map and a device list with an active distance threshold such that only devices within the distance threshold as indicated on the map appear in the device list;

[0050] Fig. 19 shows a schematic representation of a display of a mobile device displaying both a device map and a device list with an active angular section filter such that only devices within the angular section as indicated on the map appear in the device list;

[0051] Fig. 20 shows a schematic representation of a display of a mobile device displaying both a device map and a device list, the listed devices sorted according to which gateway device they are connected to;

[0052] Fig. 21 shows a schematic representation of a display of a mobile device displaying both a device map and a device list, the device map including a suggested route; and

[0053] Fig. 22 shows a schematic representation of a display of a mobile device displaying directional indicators and a device list, the directional indicators showing the direction to a selected HVAC field device.

[0054] DESCRIPTION OF THE EMBODIMENTS

[0055] Reference will now be made in detail to certain embodiments, examples of which are illustrated in the accompanying drawings, in which some, but not all features are shown. Indeed, embodiments disclosed herein may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided for illustrative purposes so that this disclosure will satisfy applicable legal requirements. Whenever possible, like reference numbers will be used to refer to like components, parts or steps. For better legibility, a feature described with reference to a particular drawing will include the reference number(s) used for that particular drawing whenever possible, however will typically not include the reference numbers) used for the same feature in other drawings.

[0056] In Fig. 1 , reference numeral 3 refers to a facility, in this particular case an office building. The facility 3 is typically designed for human occupation, such as a home, apartment building, office building, healthcare institution, education institution, manufacturing plant, etc. The facility 3 may also include sporting venues or transportation facilities. The facility 3 may also not be directly designed for human occupation, for example agricultural facilities (e.g., greenhouses, animal factories, etc.). The facility 3 may have a floor 31 or multiple floors.

[0057] The facility 3 has the need for heating, ventilation, and / or air conditioning (HVAC), typically for climate control and / or control of water, air, or other fluids throughout the facility 3.

[0058] In Fig. 2, a person 6, such as a technician 6, is in possession of a mobile device 2 and is situated at the facility 3, in a particular room 31A on a particular floor 31 inside the facility 3. The mobile device 2, which may also be referred to as a tool device, is explained in more detail with reference to Fig. 5. In this exemplary embodiment, the room 31 A has several HVAC field devices 1A, 1 B, 1 C, 1 D which may be installed. The HVAC field devices 1A, 1 B, 1 C, 1 D may also not yet be installed (e.g., they may be in a transportation container and temporarily placed in the room 31 A prior to installation).

[0059] In an embodiment, multiple technicians 6, each having in their possession a mobile device 2, are situated in the facility 3, for example in the same or different parts of the facility 3, the mobile devices 2 each performing one of the methods described herein. A HVAC field device 1 , i.e. any of 1A, 1 B, 1C or 1 D, typically forms part of an HVAC system of the facility 3, the HVAC system often being controlled by a building control system (also referred to as a building automation system (BAS)). The HVAC field devices 1A, 1 B, 1 C, 1 D allow for measurement of physical values using the sensors and / or control of flow of fluids throughout the HVAC system, for example in relation to the room 31A. An HVAC field device 1 installed in a particular room 31A may also be configured to measure and / or control the flow of fluids for one or more rooms in which it is not installed. The HVAC field device 1 is described in more detail with reference to Fig. 4.

[0060] The HVAC field device 1 may be an installed HVAC field device 1A, 1 B, 1 C, 1 D. Specifically, the HVAC field device 1 , 1A, 1 B, 1 C, 1 D may be installed by directly or indirectly physically mounting the HVAC field device 1 , 1A, 1 B, 1 C, 1 D to a structure of the facility 3 by mounting means. Installation of the HVAC field device 1A, 1 B, 1C, 1 D can comprise physically connecting the HVAC field device 1A, 1 B, 1 C, 1 D to a part of the HVAC system, such as a duct, pipe, valve, radiator, etc. The HVAC field device 1A, 1 B, 1C, 1 D may already be configured for operation or not yet configured. Specifically, for the HVAC field device 1A, 1 B, 1 C, 1 D to be in a state for operation, configuration parameters are typically required to be set, for example by a technician. The HVAC field device 1A, 1 B,

[0061] IC, 1 D may also already be commissioned, or may not yet be commissioned.

[0062] As is discussed herein, it is beneficial, both prior to installation and subsequent to installation, for the technician 6 to be able to quickly find the HVAC field devices 1A, 1 B, 1C,

[0063] I D, in particular without having to consult a separate HVAC system plan, building information model (BIM), and / or a building plan, and / or visually inspect the facility, in particular the room 31 A, in detail. Specifically, it is beneficial for the technician 6 to be able to obtain device information related to a particular HVAC field device 1A, 1 B, 1C, 1 D without having to inspect the particular HVAC field device 1A, 1 B, 1 C, 1 D in detail. The HVAC field devices 1A are installed on an air duct 32 which is positioned above a dropped (suspended) ceiling 33 and therefore concealed from view of the field technician 6. The HVAC field device 1A in this case may comprise a flow meter 1A configured to measure the flow of air through the air duct 32, a damper configured to control the flow of air through the air duct 32, and / or other sensors or actuators. The flow meter 1 A may measure other values of the air inside the air duct 32, such as a temperature and / or a humidity, a carbon dioxide (CO2) concentration, etc. The flow meter 1A may also be configured to measure properties of the air inside the room.

[0064] The HVAC field devices 1 B are installed inside the air duct 32 and may comprise, for example, a damper (not shown) configured to control the flow of air through the air duct 32.

[0065] The HVAC field device 1C is connected to a radiator 34 and configured to measure and / or control a flow of a fluid through the radiator 34. The HVAC field device 1C may be installed inside a wall (not shown) or coupled to the radiator 34 inside the room. The HVAC field device 1 C may also be separate from the radiator 34 and configured to measure and / or control a flow of a fluid through a flow circuit installed in or underneath the ceiling, walls, and / or floor.

[0066] In addition to the HVAC field devices 1A, 1 B, 1C, 1 D installed as depicted in the room 31 A of the floor 31 , the facility 3 may comprise additional HVAC field devices 1A, 1 B, 1C, 1 D located on other floors, in a basement of the facility 3, on the roof, adjacent to the building, in a separate building, or anywhere else in the facility 3.

[0067] The HVAC field devices 1A, 1 B, 1 C, 1 D, are coupled to an HVAC system, in particular a HVAC system of the facility 3, and, depending on the embodiment, may comprise at least one sensor and / or at least one actuator. As explained below in more detail, each of the HVAC field devices 1A, 1 B, 1C, 1 D include an ultra-wideband (UWB) communications module and are configured to exchange UWB transmissions, for example between a particular HVAC field device 1A, 1 B, 1 C, 1 D and a mobile device 2, but also from one HVAC field device 1A, 1 B, 1 C, 1 D to another HVAC field device 1A, 1 B, 1C, 1 D.

[0068] A gateway device 4 includes a UWB communications module and is configured to communicate with the HVAC field devices 1A, 1 B, 1C, 1 D either directly or indirectly (e.g., via an intermediary device, such as another HVAC field device 1A, 1 B, 1C, 1 D or the mobile device 2). The gateway device 4 is further connected to another communication network, for example a local area network (LAN) and / or the Internet, via a wired and / or wireless connection. In particular, the gateway device 4 is connected to a server 5, for example a cloud-based server.

[0069] Depending on the embodiment, the gateway device 4 may act as a bridge device between the HVAC field device(s) 1A, 1 B, 1C, 1 D and / or the mobile device 2, and the server 5.

[0070] In an embodiment, one of the HVAC field devices 1A, 1 B, 1C, 1 D is configured as a gateway device 4 and includes a UWB to LAN (e.g., WLAN and / or wired Ethernet) interface. The gateway device 4 may further include a direct connection to a server 5, such as a local server or a cloud-based server.

[0071] The server 5, e.g. cloud-based server comprises one or more computers with one or more processors and a communication module configured to communicate via the communication network with the mobile device 2. The processors are configured to execute one or more steps and / or functions as described herein. The cloud-based server 3 further comprises a memory (not shown) for storing data related to the HVAC field device 1. Depending on the implementation, one or more of the steps and / or functions described herein as being performed by the mobile device 2 and / or the gateway device 4 may be performed by the server 5.

[0072] The server 5 may be a cloud-based server and thus arranged remotely from the HVAC field device and the mobile device 2, for example in a computing center.

[0073] As described below in more detail, the mobile device 2 is configured to determine positioning information (i.e., information related to an installation position, which may include one or more relative or absolute distances and / or directions) of one or more HVAC field devices 1 , 1A, 1 B, 1C, 1 D. Thereby, the technician 6 can easily locate the HVAC field device 1 , 1A, 1 B, 1 C, 1 D, even if it is hidden from view, for example by being installed in a wall, above a dropped ceiling 33, or inside an air duct 32.

[0074] Advantageous embodiments also provide for the technician 6 selecting, on the mobile device 2, a particular HVAC field device 1A, 1 B, 1C, 1 D from a plurality of HVAC field devices 1A, 1 B, 1 C, 1 D, and being provided location information of that particular HVAC field device 1A, 1 B, 1C, 1 D, such that the technician 6 may find (i.e. locate) the particular HVAC field device 1A, 1 B, 1C, 1 D in a room 31A having multiple HVAC field devices 1A, 1 B, 1C, 1 D. This is particularly useful when a particular HVAC field device 1A, 1 B, 1C, 1 D requires the technician’s attention, for example for configuration, repair, maintenance or replacement. Selecting the particular HVAC field device 1A, 1 B, 1 C, 1 D may include filtering a list of HVAC field devices 1A, 1 B, 1 C, 1 D according to one or more properties, parameters, and / or attributes of the HVAC field devices 1A, 1 B, 1C, 1 D.

[0075] The floor 31 may include two or more areas. For instance, in Fig. 3, the floor includes two areas (for example, two rooms) and the technician 6 situated in the first room 31 B. The HVAC field devices 1 , T in the first room 31 B are within communication range of each other and are configured to establish a first mesh network M1. In particular, the HVAC field devices 1 , T are programmed such that they initiate, establish, generate, connect to, join, communicate with, and / or otherwise interact with the first mesh network M1 . The first mesh network M1 is connected to the server 5 by way of the gateway device 4. The HVAC field devices 1 , T in the second room 31 C are within communication range of each other and are configured to establish a second mesh network M2. The HVAC field devices 1 , T of the second mesh network M2 are not connected to the server 5 due to the lack of a connection link between an HVAC field device 1 , T of the first mesh network M1 and an HVAC field device 1 , T of the second mesh network M2. This could be due to an obstruction, as UWB transmissions may be obstructed (i.e. sharply attenuated) by walls, doors, furniture, or other objects in between two particular HVAC field devices 1 , T.

[0076] The mobile device 2 comprising an UWB communications module is, in an embodiment, configured to act as a relay between the first mesh network M1 and the second mesh network M2. In particular, the mobile device 2 is situated such that it is in communicative range with at least one HVAC field device 1 , T of the first mesh network M1 and at least one HVAC field device 1 , T of the second mesh network M2. As described below in more detail, the mobile device 2 may be configured to receive messages from the first mesh network M1 and forward them to the second mesh network M2, and vice versa.

[0077] In such a manner, not only can messages be passed from a given HVAC field device 1 , T of the first mesh network M1 to a HVAC field device 1 , T of the second mesh network M2, but the HVAC field devices 1 , T of the second mesh network M2 may connect to the server 5 via the gateway device 4 as a result of the link provided by the mobile device 2 between the first mesh network M1 and second mesh network M2. As illustrated in Fig. 4, the HVAC field device 1 comprises a processing unit 11 , an ultra- wideband (UWB) communications module 12, and one or more UWB antennas 13. Depending on the embodiment, the HVAC field device 1 may include one or more sensors 14 and / or one or more actuators 15. The HVAC field device 1 may include hardware and / or software modules such that the HVAC field device 1 is operable as a metering device, in particular as a thermal energy meter (TEM) configured to measure a flow of thermal energy through a channel. Preferably, the thermal energy meter is approved by the European Measuring Instruments Directive (MID). The HVAC field device 1 may include hardware and / or software modules such that the HVAC field device 1 is operable as an electrical meter for measuring a flow of electrical power and / or a sanitary meter for measuring a flow of blackwater and / or greywater.

[0078] In an embodiment, the HVAC field device 1 is a control device having a user interface for controlling the HVAC system to which the HVAC field device 1 is connected. The user interface may further include a display for displaying information related to the HVAC system.

[0079] Typically, the electronic components (e.g., the aforementioned electronic components of the processing unit 11 , the UWB communications module 12, as well as the sensors 14 and / or actuators 15) of the HVAC field device 1 are electrically connected to each other. At least some of the electronic components may be arranged on one or more connected PCBs inside a housing of the HVAC field device 1. The HVAC field device 1 further comprises a power supply (not shown) connected to the electronic components and may also include power electronics for regulating the power supply (also not shown). The power supply can include a socket for receiving power via a wire connected to power delivery means of the facility 3. The power supply can also include a battery or other power storage means. In an embodiment, the power supply of the HVAC field device 1 includes a battery. The HVAC field device 1 is configured such that, when the HVAC field device 1 is not connected to an electrical system / network of the facility, the HVAC field device 1 is powered by the battery. The HVAC field device 1 is configured to power the UWB communications module 12 using the battery. Thereby, the HVAC field device 1 may be found by the technician 6 using the mobile device 2 prior to being connected to power, for example in cases where the HVAC field device 1 is still in storage, in a transport container, on a pallet at the facility, has been physically installed but not yet connected to power, etc.

[0080] The HVAC field device 1 may operate in a configuration mode in which the UWB communications module 12 is activated for receiving configuration parameters from the mobile device 2 and storing the configuration parameters in the memory (not shown in Fig.4). In such a manner, the HVAC field device 1 can be configured prior to being connected to the electrical system / network, enabling an efficient and flexible configuration prior to or during installation. In an embodiment, the HVAC field device 1 is configured to enter a configuration mode upon determining that the HVAC field device 1 is not connected to the electrical system / network. In the configuration mode, the HVAC field device 1 operates in a low power state in which the UWB communications module 12 is provided power by integrated power storage means (e.g., a battery). Depending on the embodiment, the HVAC field device 1 is configured such that only the UWB communications module 12 is powered on in the configuration mode. The UWB communications module 12 is configured to receive, while in the configuration mode, from the mobile device 2, configuration parameters and to store the configuration parameters. The configuration parameters are stored in a non-volatile memory module of the UWB communications module 12, for example an EEPROM or a flash memory module. The configuration parameters are, additionally or alternatively, stored in the memory of the processing unit 11 , or stored in a memory accessible by the processing unit 11 . The HVAC field device 1 is configured to enter into an operational mode once the HVAC field device 1 is connected to power. In the operational mode, the HVAC field device 1 is configured to apply the configuration parameters received in the configuration mode. Applying the configuration parameters may include the UWB communications module 12 transmitting the configuration parameters from a non-volatile memory module of the UWB communications module 12 to the memory of the processing unit 11. Additionally or alternatively, applying the configuration parameters includes the processing unit 12 retrieving the configuration parameters from the non-volatile memory module of the UWB communications module 12.

[0081] The HVAC field device 1 is installed using mounting means, in particular for attaching the housing of the HVAC field device to, for example, a valve, an air duct, an air damper, or a wall, a ceiling, a pole of the facility 3. The mounting means include, for example, one or more screws, bolts, brackets, or other connectors such as snap-fit connectors.

[0082] The processing unit 11 comprises one or more electronic chips, for example one or more integrated circuits, microcontrollers, microprocessors, application specific circuits (ASICs), or the like.

[0083] The processing unit 11 may also include a memory (not shown), the memory including volatile (non-persistent) and / or non-volatile (persistent) memory modules. For example, the memory is implemented using solid state memory (e.g. flash memory). The memory may be configured to store firmware, an operating system, and / or additional data relating to the firmware and / or operating system, such as application data, software libraries, log data, etc.

[0084] In an embodiment, the HVAC field device 1 further includes an auxiliary separate from the processing unit 11 . The auxiliary memory may be integrated into part of the UWB communications module 12 or separately arranged in the HVAC field device 1. The auxiliary memory is connected to the processing unit 11 and the UWB communications module 12.

[0085] The processing unit 11 is configured to execute one or more steps and / or functions as described herein. For example, the processing unit 11 is configured to execute one or more steps and / or functions as stored in the memory. The steps and / or functions are stored, for example, in the memory as program code (e.g., as part of the firmware, the operating system, and / or the software libraries). Other steps and / or functions may be carried out by specifically arranged circuitry in the processing unit 11 .

[0086] In particular, the memory may be configured to be able to store configuration parameters related to the HVAC field device 1 , for example configuration parameters received from the mobile device 2. In an embodiment, the configuration parameters can be temporarily stored in, and / or retrieved from, the auxiliary memory.

[0087] Depending on the embodiment, the processing unit 11 and the memory may be integrated into a single electronic chip, for example in the form of a System-on-a-Chip (SoC).

[0088] The UWB communications module 12 is a circuit configured to exchange (i.e., transmit and receive) UWB signals. The UWB communications module 12 may be connected, directly or indirectly, to the processing unit 11. The UWB communications module 12 can be implemented as a discrete circuit or integrated into one or more other units and / or modules of the HVAC field device 1. The UWB communications module 12 is configured to determine positioning information (one or more distances and / or one or more angles) using transmission properties of the UWB signals. The transmission properties of UWB signals, include intrinsic properties of the UWB signals, including frequencies used (e.g., center frequency and frequency bandwidth), transmission time point, transmission power, data rate, encoding scheme, and / or data included in the UWB signals. The transmission properties of UWB signals also include, according to this disclosure, measured and / or otherwise determined properties of the UWB signals and / or of the transmitting and / or receiving device, or values derived therefrom, for example, a time of arrival (ToA), a time difference of arrival (TDoA), reverse TDoA, a time-of-flight (ToF), a round-trip time (RTT), a received signal strength indicator (RSSI), one or more angles of arrival (AoA), a phase difference of arrival (PDoA), a relative orientation with respect to the counter device, and / or a relative distance of the HVAC field device 1 with respect to a counter device (e.g., the mobile device 2 or the gateway device 4). Depending on the embodiment, one or more particular techniques such as the ToF, two-way ranging (TWR), TDoA, reverse TDoA, or PDoA may be used to determine one or more relative distances and / or one or more relative angles (e.g., AoA) between the HVAC field device 1 and the counter device.

[0089] Depending on the embodiment, these transmission properties may be determined in the UWB communications module 12, in the processing unit 11 , or in a combination of the UWB communications module 12 and the processing unit 11. Further, the transmission properties can also be determined, at least in part, in a separate device, for example the gateway device 4 and / or the server 5.

[0090] The UWB communications module 12 is typically connected to at least one UWB antenna 13, however may in some embodiments be connected to more than one UWB antennas 13.

[0091] In an embodiment where the HVAC field device 1 include a single UWB antenna 13, the UWB antenna 13 is preferably arranged inside the HVAC field device 1 on a side of the HVAC field device 1 which faces towards a center of an installation space. This is achieved, for example, by arranging the UWB antenna 13 on a side opposite to a side including the mounting means. For example the UWB antenna 13 is arranged on a side of the PCB opposite to the mounting means. This ensures that the PCB is not between the UWB antenna 13 and any counter device 3 situated in a space of the facility in which the HVAC field device 1 is installed or to which the HVAC field device 1 is adjacent. This is because the PCB may disturb or block the UWB transmissions. In general it is preferable to have as few internal or external parts or components which absorb or reflect UWB signals to ensure a high signal quality, in particular good UWB signal reception and transmission in different directions.

[0092] In an embodiment where the HVAC field device 1 includes multiple UWB antennas 13, the UWB antennas are arranged such that they have mutual separation distances of at least 2 centimeters, preferably at least 5 centimeters.

[0093] The HVAC field device 1 may include one or more sensors 14 for measuring environmental values of the facility, in particular the floor and / or the room in which the HVAC field device 1 is installed, connected to, or adjacent to. The sensors 14, include, for example, a temperature sensor configured to measure an ambient temperature. The sensors 14 may include a temperature sensor configured to measure a temperature of a fluid of the HVAC system, such as air traveling through a channel or duct, or a water or water-based HVAC fluid (e.g. a water-glycol mixture) for providing heating or cooling energy. The sensors 14 may further include a humidity sensor, a carbon dioxide (CO2) sensor, a fine particular matter sensor, etc.

[0094] The sensors 14 may include further sensors (not shown) for determining physical values of the HVAC system or a part of the HVAC system to which the HVAC field device 1 is connected, such as an ultrasonic sensor configured to measure values of an HVAC fluid in a channel, duct, or pipe. The HVAC field device 1 may include one or more actuators 15, including, for example, an electromechanical actuator 15 for driving a valve or damper to control the flow of a fluid through the HVAC system.

[0095] As illustrated in Fig. 5, the mobile device 2 includes a processing unit 21 , an UWB communications module 22, one or more UWB antennas 23, a user interface 24, a display 25, and optionally a further wireless communications module 26. These components of the mobile device 2 are connected to each other. The mobile device 2 further comprises a power source (not shown), for example a battery, and depending on the implementation, may include further electronic components as described herein.

[0096] The mobile device 2 may be implemented, for example, as a smart phone running the iOS or Android operating system and configured to execute one or more software applications (Apps) which may be downloaded from a server. In particular, the mobile device 2 may be configured to perform the steps and / or functions described herein by downloading and installing one or more Apps, the Apps comprising a computer program product (i.e. software) containing suitable program instructions. The mobile device 2 may alternatively be implemented as another type of portable electronic device, such as a tablet computer or laptop computer configured for wireless data communication. The mobile device 2, however, is not limited to the aforementioned embodiments. For example, the mobile device 2 may more generally be considered an electronic tool device suitable for interacting with the HVAC field device 1.

[0097] The processing unit 21 comprises one or more electronic chips, for example one or more integrated circuits (ICs), microcontrollers, microprocessors, application specific circuits (ASICs), or the like. The processing unit 21 may also include a memory, the memory may include volatile (non-persistent) and / or non-volatile (persistent) memory modules. For example, the memory may be implemented using solid state memory (e.g. flash memory). The memory may be configured to store firmware, an operating system, and / or additional data relating to the firmware and / or operating system, such as application data, software libraries, log data, etc.

[0098] The processing unit 21 is configured to execute one or more steps and / or functions as described herein. For example, the processing unit 21 may be configured to execute one or more steps and / or functions as stored in the memory. The steps and / or functions are stored, for example, in the memory as program code (e.g., as part of the firmware, the operating system, and / or the software libraries). Other steps and / or functions may be carried out by specifically arranged circuitry in the processing unit 21.

[0099] Some steps and / or functions of the present disclosure refer to the providing of particular information. The providing is not limited to a transmission (and therefore, a reception) of the information by another device or necessarily another component of a particular device, but merely the making available of the information. Specifically, a particular component of the mobile device 2 may provide information to another (or the same) component of the mobile device 2, as is explained below in more detail.

[0100] In particular, the memory may be configured to store configuration parameters related to the HVAC field device 1 , for example as received from the server 5.

[0101] The mobile device 2 comprises an UWB communications module 22 connected to the processing unit 21 and configured for UWB communication with one or more HVAC field devices 1 by exchanging (i.e. transmitting and receiving) UWB signals. The UWB communications module 22 may be configured for communication with the gateway device 4.

[0102] Depending on the embodiment, the UWB communications module 22 may be configured to determine one or more transmission properties of the UWB signals. The transmission properties of the UWB signals and how they are determined are detailed herein with respect to the UWB communications module 12 of the HVAC field device 1 , however similar considerations may also apply to the UWB communications module 22 of the mobile device 2, which may be configured to determine transmission properties of the UWB signals in a similar manner. Alternatively or additionally, the processing unit 21 of the mobile device 2 may also be configured to determine the transmission properties of the UWB signals.

[0103] The mobile device 2 further comprises one or more UWB antennas 23 connected to the UWB communications module 22.

[0104] The mobile device 2 further includes a user interface 24 and a display 25. The user interface 24 may be embodied, for example, by one or more buttons, a touch display, and / or a microphone. The user interface 24 is configured to receive user input from a user, in particular from the technician 6.

[0105] The display 25 may, for example, be implemented as an LCD, OLED or other type of flat-panel. Depending on the embodiment, the user interface 24 and the display 25 may be integrated into the same component, for example as a touch screen as is common in today's smart phones, tablets, and laptop computers. The display 25 may be configured to display information to the user, in particular the technician 6. The mobile device 2 may further include a wireless communications module 26 for communication over a second wireless channel different from UWB. In particular, the wireless communications module 26 may be configured for communicating via a wireless communication network. The communication network may comprise a mobile radio network such as a GSM (Global System for Mobile Communication) network, a UMTS (Universal Mobile Telephone System) network, and / or another cellular radio communication network. The communication network 8 may further comprise the Internet and a LAN (local Area Network) and WLAN (Wireless LAN) for accessing the Internet.

[0106] WLAN and / or mobile radio (e.g., 3G, 4G, 5G, CDMA, UTMS) communication. The wireless communications module 26 may be configured to communicate with a wireless network, e.g. a WLAN network or a mobile radio network and enables a wireless communication between the mobile device 2 and other devices, in particular a cloud-based server via one or more intermediary networks such as the Internet.

[0107] The wireless communications module 26 may further be configured for close range wireless communication using Radio Frequency Identification (RFID), Near Field Communication (NFC), Bluetooth, or Bluetooth Low Energy (BLE) communication. In some embodiments, the mobile device 2 may further comprise one or more further wireless communications modules, each dedicated to a particular wireless communication protocol, e.g. RFID, NFC, Bluetooth, etc.

[0108] Depending on the embodiment, the mobile device 2 may include one or more cameras (not shown). In an embodiment, the mobile device 2 may be configured to display a live feed of the camera on the display 25. The mobile device 2 can further comprise or be connected to one or more range imaging sensors configured to determine a plurality of distances (also referred to as depths) between the mobile device 2 and a surrounding structure (i.e. the physical structure of the facility or part thereof, such as a floor, zone, room, building, etc.) and thereby to generate a two-dimensional or three-dimensional model of at least part of the surroundings of the mobile device 2. The model may represent fixed structural features of the facility, in particular floors, walls, and ceilings. The model may also represent movable structural features, including objects and / or equipment such as furniture, machines, devices, vehicles, etc.

[0109] The one or more range imaging sensors may be embodied as a light detection and ranging (LIDAR) sensor. The one or more range imaging sensors may be implemented to use laser light or LED light.

[0110] The range imaging sensor may be implemented using two cameras configured for stereoscopic view.

[0111] The range imaging sensor may project a pattern onto at least part of the surroundings, recording the pattern with a camera to generate the model.

[0112] The range imaging sensor may also use Time of Flight (ToF) to establish the model. For example, the sensor may be a ToF sensor, sometimes also referred to as a ToF camera.

[0113] In an embodiment, the mobile device 2 is configured to identify, using the range imaging sensor, one or more HVAC field devices 1. The mobile device 2 is configured to identify the one or more HVAC field device 1 using data from the range imaging sensor and / or the model generated therefrom. The mobile device 2 may be further configured to determine positioning information of the one or more HVAC field devices 1 using the data from the range imaging sensor and / or the model, the positioning information including a relative distance between the mobile device 2 and a particular HVAC field device 1 and / or a relative orientation between the mobile device 2 and the particular HVAC field device 1.

[0114] In an embodiment, the mobile device 2 is configured to identify the one or more HVAC field devices 1 and / or determine the positioning information by comparing the data from the range imaging sensor and / or the model with shape data including, for example, one or more two-dimensional and / or three-dimensional representations of HVAC field devices 1. The comparison may comprise the use of a classification model, for example a classification model trained using machine learning and a training dataset including one or more two-dimensional and / or three-dimensional representations of HVAC field devices 1. The classification model may comprise a neural network, in particular a convolutional neural network. The shape data may be stored locally, in particular in the memory of the mobile device 2, or may be stored remotely, for example in the server 5. In an embodiment, the positioning information determined using the range imaging sensor is combined with positioning information determined using the exchanged UWB signals, for example using one or more sensor fusion techniques. Thereby, the relative distances and / or relative angles between the mobile device 2 and the HVAC field device 1 may be determined with more accuracy and / or more precision. The combination may comprise calculating an average of the positioning information determined using the range imaging sensor and the exchanged UWB signals, or selecting one or other source of positioning information depending on one or more predefined criteria.

[0115] In an embodiment, the mobile device 2 is configured to render the model on the display 25 of the mobile device 2. Preferably, the mobile device 2 further uses data received from a magnetic sensor, multi-axis accelerometer, and / or a gyroscope of the mobile device 2 to render the model, thereby allowing for the rendering and / or display of HVAC field devices 1A, 1 B, 1C, 1 D on the display 25 of the mobile device 2, overlaid on the model of the surroundings, at a position corresponding to their installation location. The display of the HVAC field devices 1A, 1 B, 1C, 1 D may include the display of device information, status information, configuration parameters, and / or physical values determined by the HVAC field devices 1A, 1 B, 1C, 1 D.

[0116] In an embodiment, the HVAC field devices 1A, 1 B, 1 C, 1 D are rendered on the display such that their relative size on the display corresponds to their relative distances from the mobile device 2. Thereby, a particular HVAC field device 1A, 1 B, 1 C, 1 D nearer to the mobile device 2 is displayed with a larger size on the display than another HVAC field device 1A, 1 B, 1 C, 1 D farther away. Thereby, the technician 6 immediately recognizes relative distances between the HVAC field devices 1A, 1 B, 1 C, 1 D and the mobile device 2.

[0117] In an embodiment, only a pre-determined number of HVAC field devices 1A, 1 B, 1C, 1 D are displayed at the same time. This can reduce visual clutter. The HVAC field devices 1A, 1 B, 1C, 1 D displayed may be those nearest the mobile device, or those displayed according to filter criteria or a sorting rule.

[0118] Figs. 6 to 12 describe methods 600 - 1200, each including steps performed by one or more devices according to the present disclosure.

[0119] Fig. 6 describes a method 600 including a number of steps S1 - S5. In step S1 , UWB signals are exchanged between the HVAC field device 1 and the mobile device 2. The details of the UWB signal exchange are described below in more detail with reference to Figs. 7 and 8. Thereby, the UWB communications module 12 of the HVAC field device 1 , the UWB communications module 22 of the mobile device 2, and / or the processing unit of either the HVAC field device 1 and / or mobile device 2 (or a processing unit of a further device, such as the gateway device 4 or the server 5), may calculate one or more distances and / or angles (e.g., angles of arrival) between the HVAC field device 1 and the mobile device 2 using only a single UWB signal. Depending on the embodiment, this may require the HVAC field device 1 and the mobile device 2 to have synchronized clocks and for the UWB signal to include a timestamp. The timestamp included in the first UWB transmission and an internal clock of the receiving device is used to calculate the one or more distances and / or angles of arrival using the time-of-f light principle.

[0120] The specific number of distances and angles (e.g., angles of arrival) derivable from the transmission properties of the UWB signal(s) exchanged between the HVAC field device 1 and the mobile device 2 depends on the number of UWB antennas 13, 23 which the HVAC field device 1 and the mobile device 2 may have.

[0121] In step S2, positioning information related to a position of the HVAC field device 1 is determined. The positioning information is determined using the transmission properties of the exchanged UWB signal(s). The positioning information may include, for example, a distance between the HVAC field device 1 and the mobile device 2 and / or a direction (expressed using one or more angles, for example) between the HVAC field device 1 and the mobile device 2. In an embodiment where either the HVAC field device 1 and / or the mobile device 2 includes more than one UWB antenna 13, 23, the positioning information may include one or more distances, one or more angles (e.g., angles of arrival (AoA), such as an elevation and / or an azimuthal angle), and / or a position in two-dimensional or three-dimensional space. The positioning information may be relative to a position of the HVAC field device 1 and / or the mobile device 2. The positioning information may be an absolute position with respect to a map or plan of the facility 3 or of a particular floor 31 or room of the facility 3.

[0122] Alternatively and / or additionally, the positioning information may relate not to a precise installation location of the HVAC field device 1 , but may indicate a presence of the HVAC field device 1 within communication range of the mobile device 2. This may be advantageous in cases where the transmission properties (e.g., the received signal strength indicator and / or the received signal quality) are not sufficient for providing more precise location information.

[0123] The positioning information is determined in the processing unit 11 , 21 of the HVAC field device 1 and / or mobile device 2, respectively. The positioning information may, additionally or alternatively, be determined in a processing unit (not shown) of the gateway device 4 and / or the server 5, for instance a cloud-based server. The positioning information may, additionally or alternatively, be determined in the UWB communication module 11 , 21 of the HVAC field device and / or the mobile device 2. If the positioning information is determined in a device other than the mobile device 2 and / or the HVAC field device 1 , then determining the positioning information may include one or more intermediary steps between the mobile device 2 and / or the HVAC field device 1 and the device which determines the positioning information. For example, if the positioning information is determined in the server 5, then the transmission properties of the UWB signal(s), or values derived therefrom, are transmitted to the server 5, which then determines the positioning information and transmits the positioning information to the mobile device 2.

[0124] If the positioning information is determined in a device other than the mobile device 2, then that device transmits the positioning information to the mobile device 2. For example, if the positioning information is determined by the HVAC field device 1 , then the HVAC field device 1 transmits the positioning information to the mobile device 2, for example using one or more UWB transmissions. In another example, if the positioning information is determined by the server 5, then the server 5 transmits the positioning information to the mobile device 2, for example using a wireless communications connection comprising the Internet. In step S3, device information of the HVAC field device 1 is received in the mobile device

[0125] 2. The device information may be received directly from the HVAC field device 1 , or via an intermediary device, for example the gateway device 4.

[0126] The device information may relate to, for example, a unique identifier of the HVAC field device 1 , such as a serial number or a MAC address. The device information can further include a device family, a device type, a device generation, a software and / or firmware version installed in the device, device platform information, a device manufacturer, a device model, and / or a device description. The device information may further include a description of the components of the HVAC field device 1 , in particular which sensors 14 and / or actuators 15 the HVAC field device 1 may have, and / or a graphical representation of the HVAC field device 1.

[0127] In an embodiment, the device information further includes status information relating to a current status of the HVAC field device 1. The status information indicates, for example, whether the HVAC field device 1 has been found, installed, configured, commissioned, and / or tested. The status information further indicates if the HVAC field device 1 is malfunctioning, in particular whether an error has occurred and repair or maintenance is to be performed.

[0128] The device information may further include BIM information including, for example, an intended or planned installation location of the HVAC field device 1. This planned installation location may be used to refine the positioning information. For example, the planned installation location may indicate a floor in which the HVAC field device 1 is installed in, which may help to refine the positioning information if, for example, only a single distance between the HVAC field device 1 and the mobile device 2 is determined. For example, the planned installation location may be defined using two-dimensional or three-dimensional coordinates, preferably with reference to a building reference point, for example as defined in a Bl M.

[0129] The device information may further include sensor information and / or actuator information. The sensor information relates to current values (e.g., “live” values) measured by sensors of the HVAC field device. The sensor information may also relates to recorded sensor values. The actuator information relates to one or more current settings of the one or more actuators of the HVAC field device, for example a valve or damper position.

[0130] The device information may further include configuration parameters of the HVAC field device. The configuration parameters relate to electronically adjustable settings of the HVAC field device. The configuration parameters may include all parameters required for commissioning of the HVAC field device 1 .

[0131] In step S4, the device information and the positioning information is displayed on a display 25 of the mobile device 2. In an embodiment where the device information includes status information, the mobile device 2 may be configured to prominently display a warning, alert, and / or alarm indicator (e.g., an icon, graphic, and / or message) if the HVAC field device 1 is malfunctioning.

[0132] In an embodiment where the device information includes sensor values and / or actuator values, the mobile device 2 may be configured to display the sensor values and / or actuator values on the display. The mobile device 2 may be configured to prominently display a warning, alert, and / or other alarm indicator if the sensor values and / or actuator values indicate a malfunctioning device and / or conditions of the HVAC field device 1 , HVAC system, or facility, outside of defined operating conditions. The technician 6 in possession of the mobile device 2 can thereby easily find the HVAC field device 1 . This is particularly beneficial when the HVAC field device 1 is not readily visible, i.e. obstructed by other objects or structures, or hidden from view due to being installed above a dropped ceiling etc. This is also beneficial in cases where the HVAC field device 1 is readily visible but not readily identifiable, for example because the HVAC field device 1 is installed in or below a ceiling a great distance from the technician 6, or because the zone or room of the facility the technician 6 is in includes a number of HVAC field devices 1. The technician 6 may then access the HVAC field device 1 and perform any further necessary steps, including steps required for configuring, commissioning, testing, maintenance, and / or replacement of the HVAC field device 1 .

[0133] In an optional step S5, the mobile device 2 transmits configuration parameters to the HVAC field device 1. For example, the mobile device 2 transmits the configuration parameters using one or more UWB signals. The transmission of the configuration parameters may depend on a distance and / or a received signal strength indicator between the HVAC field device 1 and the mobile device 2, thereby reducing the chance that the configuration parameters are not transmitted in full and that only a part of the configuration parameters are transmitted. In particular, the transmission may depend on the distance between the HVAC field device 1 and the mobile device 2 being below a particular distance threshold, such as below 20 meters, below 10 meters, or below 5 meters. In addition to reducing the chance of interrupting configuration of the HVAC field device 1 with the configuration parameters, this increases the security of transmission, as only mobile devices 2 within a particular distance can configure the HVAC field device 1 .

[0134] The configuration parameters relate to electronically adjustable settings of the HVAC field device 1 . For example, the configuration parameters may include calibration parameters, communication settings, commissioning parameters and / or default parameters (e.g. initial setpoints). The configuration parameters may include one or more characteristic curves, such as a valve characteristic curve.

[0135] At least some of the configuration parameters may be pre-set, for example, pre-set to a default value or factory setting.

[0136] The configuration parameters may include an installation position of the HVAC field device 1 . Thereby, the HVAC field device 1 is provided with an absolute reference position (with respect to a room, zone, floor, building, or facility). The installation position may be defined as a set of coordinates, for example. The installation position may include indicators as to which room, zone, floor, and / or building the HVAC field device 1 is installed in.

[0137] The installation position allows for the HVAC field device 1 to provide, to a further device with which it communicates (e.g. a mobile device 2 or another HVAC field device 1), the installation position, such that the further device may calculate its own absolute position based on the installation position and one or more exchanged UWB signals. Alternatively or additionally, the installation position allows for the HVAC field device 1 to calculate the absolute position of the further device based on the installation position and one or more exchanged UWB signals.

[0138] The installation position of the HVAC field device 1 may be based on a planned position of the HVAC field device 1 as defined by a HVAC system plan and / or a building information model, which may not be entirely accurate. The installation of the HVAC field device 1 may also be based on user input which the technician 6 enters into the mobile device 2 via the user interface 24.

[0139] In an embodiment, the configuration parameters are received from the server 5, e.g. a cloud-based server. The configuration parameters may be transmitted by the server 5 in response to a request message transmitted by the mobile device 2, the request message including device information of the HVAC field device 1. In particular, the request message is configured to include the device information such that the server 5 transmits the configuration parameters for the HVAC field device 1 to the mobile device 2. The communication with the server 5 may use a wireless local area network and / or using a mobile radio network.

[0140] In an embodiment, the configuration parameters are pre-stored in the memory of the mobile device 2.

[0141] The transmission of the configuration parameters from the mobile device 2 to the HVAC field device 1 may require a user input of the technician 6 via the user interface 24 of the mobile device 2.

[0142] In an embodiment, the transmitted configuration parameters include all parameters required for commissioning the HVAC field device 1.

[0143] The HVAC field device 1 may be configured to confirm the completeness of the configuration parameters, for example by performing a checksum.

[0144] In an embodiment, the HVAC field device 1 may be configured to transmit a confirmation message upon reception of the configuration parameters and optionally upon further confirming the correctness and / or completeness of the configuration parameters 1. The mobile device 2 is configured to receive the confirmation message and to optionally display the confirmation message on the display 25 of the mobile device 2.

[0145] In an embodiment, the mobile device 2 is configured to store, in the memory, the transmitted configuration parameters. The mobile device 2 may be further configured to trans- mit the stored configuration parameters to the server 5. Thereby, a record of the configuration parameters transmitted to the HVAC field device 1 may be established in the server 5.

[0146] In an embodiment, in a subsequent configuration of the HVAC field device 1 , the stored configuration parameters are loaded, by the mobile device 2, from memory and the configuration parameters are provided as default or suggested values.

[0147] In an embodiment, the mobile device 2 is configured to display an indication that the configuration was successful.

[0148] Fig. 7 shows a method 700 comprising steps S11 - S16 for determining positioning information of the HVAC field device 1 . According to the method 700, the exchange of UWB signals is initiated by the HVAC field device 1 and the positioning information is determined in the HVAC field device 1 . The steps S11 - S16 describe in more detail step S1 (described above with reference to Fig. 6) in which UWB signals are exchanged between the mobile device and the HVAC field device 1 to determine the positioning information.

[0149] In step S11 , at least one UWB signal is transmitted by the HVAC field device 1 and at least one UWB signal is received by the mobile device 2.

[0150] For example, in one embodiment, the HVAC field device 1 transmits a UWB request message using the UWB communications module 12 in step S11. The UWB request message may be transmitted by one or more UWB antennas 13 of the HVAC field device 1. The HVAC field device 1 may be configured to transmit such UWB request messages periodically. The mobile device 2 is configured to receive the UWB request message at one or more UWB antennas 23 in step S12. The UWB request message may comprise an identifier of the HVAC field device 1 and / or a cryptographic key of the HVAC field device 1 . The UWB request message may also be digitally signed using a cryptographic key of the HVAC field device 1 and / or encrypted using a cryptographic key of the HVAC field device 1 .

[0151] In step S12, the mobile device 2 receives the UWB request message, in particular at the UWB antenna(s) 23 using the UWB communications module 22. The mobile device 2 determines transmission properties of the UWB request message, for example an arrival time, a received signal strength indicator, an angle of arrival etc.

[0152] In step S13, the mobile device 2 processes the UWB request message using the UWB communications module 22 and / or the processing unit 21. Processing the request message may comprise checking whether the HVAC field device 1 is on an al low- 1 ist of HVAC field devices 1 with which the mobile device 2 is authorized to communicate. For example, the allow-list may indicate a number of HVAC field devices 1 of the present facility 3. Processing the request message may further comprise checking a validity of the cryptographic key, checking a validity of the digital signature and / or decrypting the UWB request message using a cryptographic key of the mobile device 2.

[0153] The mobile device 2 transmits a UWB response message in step S14, after reception of the UWB request message in step S12 and processing of the request message in step S13, as a response, to the HVAC field device 1. The UWB response message may be transmitted using the one or more antennas 23 of the mobile device 2.

[0154] The UWB response message is received by the HVAC field device 1 in step S15, specifically at the one or more UWB antennas 13 connected to the UWB communications module 12 of the HVAC field device 1 . The UWB response message may include a processing time indicative of a time taken between reception of the UWB request message and transmission of the UWB response message. The HVAC field device 1 is configured to receive the UWB response message at the one or more antennas 13 using the UWB communications module 12.

[0155] Depending on the embodiment, the response message may include the cryptographic key provided by the HVAC field device 1 in the request message. The response message may further be digitally signed by the mobile device 2 using a cryptographic key of the mobile device 2 and / or be encrypted using the cryptographic key of the mobile device 2.

[0156] In step S16, the HVAC field device 1 processes the UWB response message from the mobile device 2. Processing the UWB response message may determine one or more round-trip times (RTT) using one or more time differences between transmission of the UWB request message and receipt of the UWB response message. The number of round-trip times (RTTs) determined depends on a number of UWB antennas the HVAC field device 1 has.

[0157] The processing of the UWB response message may further include verifying whether the cryptographic key matches the cryptographic key transmitted in the request message, verifying a digital signature of the UWB response message and / or decrypting the UWB response message.

[0158] In step S2, the positioning information is determined in the HVAC field device 1. The positioning information includes one or more distances which may be determined using the RTTs and the processing time. Thereby, a two-dimensional or three-dimensional relative position between the HVAC field device 1 and the mobile device 2 may be calculated.

[0159] Fig. 8 shows a method 800 comprising a number of steps S11’ - S16’ for determining positioning information of the HVAC field device 1. The method 800 may be considered, , to be a mirror image of the method 700 in that the UWB request message is transmitted by the mobile device 2 in step S11’, the UWB request message is received by the HVAC field device 1 in step S12’, the HVAC field device 1 processes the request message in step S13’, the HVAC field device transmits the UWB response message in step S14’, the mobile device receives the UWB response message in step S15’, the mobile device processes the response message in step S16’, and the positioning information is determined in the mobile device 2 in step S2. The aforementioned steps S11-S16 are therefore analogous to the steps S1 T-S16’, and similar considerations apply as described above with reference to Fig. 7.

[0160] Depending on the embodiment, the mobile device 2 may be configured to a display a live feed from a camera of the mobile device 2, or a rendering of a model of at least part of the surroundings of the mobile device 2, on the display 25. The model is preferably generated using one or more range imaging sensors coupled to, or integrated into, the mobile device 2.

[0161] The mobile device 2 is configured to render, overlaid on the live feed or rendering, a graphical representation (i.e. a picture, or a symbol) of the HVAC field device 1 on the mobile device display 25. The rendered position of the HVAC field device 1 on the display 25 is calculated, for example, in the processing unit 21 of the mobile device 2, using the positioning information of the HVAC field device 1 along with an orientation of the mobile device 2. The rendered position can also be calculated in the HVAC field device 1 itself or in the server 5, for example. The orientation of the mobile device 2 may be determined using sensors of the mobile device 2 including, for example, an accelerometer, a gyroscope, or a magnetic sensor. Thereby, HVAC field devices 1 may more easily be located by the technician 6, in particular HVAC field devices 1 which are not readily visible, on account of them being installed out of sight, for example on top of a duct, above a dropped ceiling, etc. Fig. 9 shows a method 900 comprising steps S21 - S26. Method 900 relates to an embodiment in which the mobile device 2 is in communicative range with multiple HVAC field devices 1 (as is also illustrated in Figs. 2 and 3). Similar steps are performed as described herein with reference to Figs. 6 to 8. Specifically, step S21 is analogous to step S1 , however, step S21 is performed between the mobile device 2 and each of the multiple HVAC field devices 1A, 1 B, 1C, 1 D.

[0162] Step S22 is analogous to step S2 however, step S21 is performed for each of the multiple HVAC field devices 1A, 1 B, 1C, 1 D. Step S23 is analogous to step S3, however step S23 is performed by receiving the device information of each of the multiple HVAC field devices 1A, 1 B, 1C, 1 D in the mobile device 2. In an embodiment, device information of at least one further HVAC field device 1A, 1 B, 1C, 1 D is received, from an HVAC field device 1A, 1 B, 1C, 1 D, via a mesh network of HVAC field devices 1A, 1 B, 1C, 1 D. Thereby, device information of the at least one further HVAC field device 1A, 1 B, 1 C, 1 D, which may not be in direct communicative range (i.e. UWB range) of the mobile device 2, is received in the mobile device 2 via the mesh network.

[0163] The mobile device 2 may be configured to display a device list of the one or more of the HVAC field devices 1A, 1 B, 1 C, 1 D, optionally including the device information of one or more of the HVAC field devices 1A, 1 B, 1 C, 1 D. In particular, the mobile device 2 may be configured to display all found HVAC field devices 1A, 1 B, 1 C, 1 D.

[0164] In an optional step S24, the mobile device 2 receives, for example from the technician 6 via the user interface 24, user input information that identifies a particular HVAC field device 1 from amongst the plurality of HVAC field devices 1A, 1 B, 1C, 1 D. The information may be in the form of a text string for filtering the plurality of HVAC field devices 1. The information may be in the form of a selection of a particular HVAC field device from the plurality of HVAC field devices 1A, 1 B, 1C, 1 D.ln an embodiment, the information identifies two or more of the plurality of HVAC field devices 1 . The information may, for example, identify all HVAC field devices 1 of a particular type. The information may, for example, identify every single one of the plurality of HVAC field devices 1 A, 1 B, 1C, 1 D. The information may be in the form of a selection (e.g., ticking check boxes on a list of HVAC field devices 1).

[0165] In an optional step, the mobile device 2 may be configured to filter the device list including one or more HVAC field devices 1 depending on one or more filter criteria. Thereby, a subset of the one or more HVAC field devices 1 is determined which satisfy the filter criteria. The filter criteria may include one or more pre-defined filter criteria. Additionally and / or alternatively, the filter criteria may be defined by the technician 6 via a user input. Thereby, the displayed list may be reduced in size by displaying only those HVAC field devices 1 which satisfy the filter criteria. Exemplary schematic displays of the mobile device 2 are described with reference to Figs. 16 - 22.

[0166] In an optional step, the mobile device 2 may be configured to sort the device list comprising the one or more HVAC field devices 1 depending on one or more sorting rules. The sorting rules may include one or more pre-defined sorting rules. Additionally and / or alternatively, the sorting rules may be defined by the technician 6 via a user input. Thereby, the HVAC field devices displayed in the device list may be sorted according to the one or more sorting rules.

[0167] In an optional step, the mobile device 2 may be configured to organize the device list of the one or more HVAC field devices 1 according to one or more filter criteria, in particular by grouping entries according to one or more matching filter criteria. The user input, for example, includes information in the form of one or more characters and / or symbols, a selection of one or more HVAC field devices 1 or properties thereof, etc.

[0168] Exemplary filter criteria include a defined distance threshold, such that only HVAC field devices 1 within the defined distance threshold are displayed, and / or device information criteria, by which only HVAC field devices 1 satisfying particular device information criteria are displayed. In particular, the mobile device 2 is configured to display, using the positioning information, only those HVAC field devices 1 which have a distance to the mobile device 2 less than the defined distance threshold. The distance threshold may be defined as a one-dimensional distance, two-dimensional distance, or three-dimensional distance. The distance threshold may also be defined as a path length of a path between the HVAC field devices 1 and the mobile device 2, the path being one which the technician 6 in possession of the mobile device 2 could take to reach the HVAC field devices 1.

[0169] For example, only HVAC field devices 1 of a particular type or model are shown in the device list. For example, only HVAC field devices 1 with a particular KPI are shown. The KPIs include information as to whether the HVAC field device 1 is connected to electrical power, is currently operating on battery power, is installed, commissioned, and / or configured, connected with a particular gateway device 4, etc.

[0170] The filter criteria may filter HVAC field devices 1 based on which zone, room, floor, area etc. they are installed in and / or operating for. In particular, the filter criteria may filter HVAC field devices 1 such that only those on the same floor as the mobile device 2 are shown. The filter criteria may also include a specific room, thereby either showing only HVAC field devices 1 installed in that room, or showing all other HVAC field devices 1. The specific room may be the room in which the mobile device 2 is located, or may be another room. For example, the other room may be a room into which a mesh network extends.

[0171] The filter criteria may filter HVAC field devices 1 belonging to one or more application areas. The application areas include, for example, air (ventilation), water (heating and / or cooling), sensing (e.g. room operation units, room sensors, duct sensors), actuation (air, water, fire and smoke), and supply medium (warm water, cold water, air, electricity, sanitary). Alternatively or additionally, the filter criteria may filter the HVAC field devices 1 such that only HVAC filed devices according to a particular type or model are shown in the device list.

[0172] The filter criteria may filter HVAC field devices 1 based on specific key performance indicators (KPI). For example, only HVAC field devices 1 with a particular KPI are shown. The KPIs include information as to whether the HVAC field device 1 is connected to electrical power, is currently operating on battery power, is installed, commissioned, and / or configured, connected with a particular gateway device 4, etc. The key performance indicators include, for example, a general status, an alarm status, health status, commissioning status, configuration status, and installation status.

[0173] The filter criteria may also filter HVAC field devices 1 using one or more angular sections defined relative to an orientation of the mobile device 2. For example, only HVAC field devices 1 within a defined angle, such as within 0 - 45° or 45° - 90°, preferably 0 - 30° or 70° - 90°, from a pointing vector may be shown, the pointing vector defined as a direction in which the mobile device 2 is pointed by the technician 6. For example, in an embodiment where the mobile device 2 is implemented as a smart phone, the pointing vector may be defined as originating at the smart phone and extending in a horizontal direction parallel to a long side of the smart phone, when the smart phone is held in a horizontal and portrait orientation. The angular section may be two-dimensional or three-dimensional.

[0174] The filter criteria may also filter HVAC field devices 1 according to their status information, for example only HVAC field devices 1 may be shown which have been found and identified by the technician 6. The filter criteria may also include a list of HVAC field devices 1 which have already been found and identified by the technician 6, but not yet commissioned. The filter criteria may include a list of HVAC field devices 1 which have not yet been in a defined proximity to the mobile device 2, but are part of a mesh network of devices, at least one of which the mobile device 2 has been in a defined proximity to. The mobile device 2 may be configured to receive, from the technician 6, a status update which updates the status information of the HVAC field device 1 .

[0175] The HVAC field devices 1 may be sorted using sorting rules adapted from the filter criteria described herein. For example, instead of the distance being used to filter HVAC field devices 1 , the distance may be used to sort the HVAC field devices 1 , for example by ascending distance from the mobile device 2. For example, instead of filtering HVAC field devices 1 according to their status information, the HVAC field devices 1 may be sorted according to the status information, such that those HVAC field devices 1 requiring more urgent attention are shown first. The sorting rules may further include a sorting by alphabetical order, for example of the device name, serial number, MAC address. The sorting rules may include sorting KPIs according to a KPI value. The sorting rules may include sorting the HVAC field device according to a site model, the site model including information related to the facility, building, part of building, floor, area / sector, room, zone, and / or building segment. The sorting rules may include sorting the HVAC field devices according to an alphabetical order of application area. In an embodiment, the mobile device 2 is configured to display information for only one particular HVAC field device 1 within communicative range of the mobile device 2. This may be the case if the filter criteria apply only to the particular HVAC field device 1 (e.g., only one particular HVAC field device 1 is within the distance threshold). Alternatively, this may be the case in an example where the mobile device 2 is configured to automatically select the nearest HVAC field device 1.

[0176] In an embodiment, the mobile device 2 is configured to enter into a field device configuration mode for the particular HVAC field device 1 . The field device configuration mode provides more detailed information of the HVAC field device 1 than the list view. Additionally, the configuration parameters of the HVAC field device 1 may be easily altered or updated, for example according to a pre-defined set of configuration parameters stored in the mobile device 2 or forwarded from the server 5, or as input by the technician 6. Additionally, software or firmware of the HVAC field device 1 may be updated while in the configuration mode. The software or firmware may be retrieved, by the mobile device 2, from the gateway device 4 and / or from the server 5.

[0177] In step S25, analogously to step S4 of Fig. 6, the mobile device 2 displays the device information and positioning information of the particular HVAC field device 1 on the display 25, thereby enabling the technician 6 to easily find the HVAC field device 1 .

[0178] In an embodiment, the mobile device 2 displays two or more of the HVAC field devices 1 identified in step S24 on the display 25, thereby enabling the technician 6 to gain an overview of the HVAC field devices 1 .

[0179] In the optional step S26, analogously to step S5 of Fig. 6, the configuration parameters are transmitted to the HVAC field device 1. In an embodiment, the mobile device 2 configures a plurality of HVAC field devices 1. In particular, the mobile device 2 is configured to transmit a plurality of sets of configuration parameters to a plurality of HVAC field devices 1 , respectively. The configuration parameters are transmitted to the HVAC field devices 1 either sequentially or simultaneously. The sets of configuration parameters are transmitted, for example, only to those HVAC field devices 1 selected or otherwise identified by the technician in step S24.

[0180] In an embodiment, the plurality of HVAC field devices 1 include at least two HVAC field devices 1 which require the same configuration parameters. For example, the at least two HVAC field devices 1 are of the same type and therefore are to be configured identically. The mobile device 2 is configured to transmit the set of configuration parameters for the at least two HVAC field devices 1 via one or more UWB signals simultaneously to both HVAC field devices 1.

[0181] In an embodiment, the configuration parameters include all parameters required for commissioning, as described above with reference to Fig. 6. The configuration parameters are optionally stored in the mobile device 2 and may further be forwarded to the server 5, e.g. a cloud-based server, along with device information, in particular an identifier, of each HVAC field device 1 configured.

[0182] Fig. 10 shows a method 1000 for rendering a map and positions of HVAC field devices 1 on the map, and includes a number of steps S31 to S33. Exemplary embodiments of such a map are shown in Figs. 16 to 22.

[0183] The mobile device 2 is configured to receive, in step S31 , mapping information. The mapping information may be received, for example, by the mobile device 2 from the server 5 or from the gateway device 4. The receiving of the mapping information may include storing the mapping information locally in the mobile device 2. In this way, the mobile device need not have continuous wireless reception. The mapping information may be received as part of a BIM. The mapping information is related to the facility, zone, and / or room in which the technician 6 in possession of the mobile device 2 is located. The mapping information is configured to enable the rendering, in the mobile device, of a map, in particular of the surroundings of the mobile device 2 such that the technician 6 can more easily find the HVAC device 1. This is because the map displays the HVAC field device 1 in relation to its surroundings.

[0184] To this end, the mapping information may comprise spatial data of the facility or part thereof. The spatial data in particular includes structural features of the building, such as a floor plan, locations of ceilings, walls, or other divisions, as well as passageways, doors, stairwells, lifts, etc.

[0185] In step S32, the mobile device 2 renders a map using the mapping information. The map may be a relative location map, a relative direction map, an absolute facility map, or an absolute floor map. The map may be a two-dimensional or three-dimensional map.

[0186] In an embodiment, the mapping information includes relative positioning information of HVAC field devices. The mapping information may include device information for one or more of the HVAC field devices, or may use instead a generic placeholder. Optionally, the mobile device 2 receives (e.g., from the server 5 or the gateway device 4) and / or determines (e.g., using an UWB signal exchange) a known installed position of at least one HVAC field device, and includes the known installed position in the mapping information. Optionally, the mobile device 2 receives device information of at least one of the HVAC field devices, either directly from the HVAC field device or via a mesh network, the gateway device 4, and / or the server 5. The mobile device 2 may be configured to automatically match HVAC field devices included in the mapping information with received device information of one or more HVAC field devices and / or with known installed positions of one or more HVAC field devices. The mobile device 2 may be configured to include the matched device information and / or known installed positions in the mapping information, and to render the map further using the matched device information and / or known installed positions of one or more HVAC field devices.

[0187] In an embodiment, the mapping information includes absolute positioning information of HVAC field devices (i.e., positioning information relative to absolute reference point, such as a building reference point). The mapping information may or may not include device information and / or known installed positions of the HVAC field devices, analogously to the description above. The mobile device 2 may be configured to match device information and / or known installed positions in the mapping information, and render the map, analogously to the description above.

[0188] The absolute positioning information may also be generated using relative positioning information and at least one absolute position of at least one HVAC field device.

[0189] The mobile device is further configured to render the HVAC field device(s) 1 overlaid on the map at the position(s) according to the positioning information of the HVAC field device(s). The HVAC field devices 1 are displayed, for example, using an icon or other symbol. The HVAC field devices 1 can additionally or alternatively include a label indicating the device information, in particular a device family, device serial number, or further KPIs.

[0190] In an embodiment, the map is rendered such that it is scaled according to a defined zone or room dimension, or scaled according to a user input. The map may rendered such that it is scaled such that at least one HVAC field device 1 is shown. The map may be rendered with visualized filter criteria, such as a circle shape which depicts a filter criteria of a distance threshold, or a wedge shape which depicts a filter criteria of an angle segment.

[0191] In step S33, the mobile device 2 is configured to display the map on the display 25 and further to display the positions of one or more of the HVAC field devices 1 on the map. Thereby, the technician 6 can more easily navigate the facility 3 to find the one or more HVAC field devices 1 desired or required.

[0192] In an embodiment, the map is an interactive map. The interactive map is configured such that the technician 6 can select one or more HVAC field devices 1 , for example by clicking or entering a touch input on the one or more HVAC field devices 1 . The selected HVAC field device(s) 1 may be shown in a device list on the display. Properties of the selected HVAC field device(s) 1 may be changed, for example the device information may be altered based on user input from the technician 6. Alternatively or additionally, configuration parameters may be transmitted to the selected HVAC field device(s) 1.

[0193] The interactive map may be configured such that one or more areas, including rooms, zones, or floors may be selected, and all HVAC field devices 1 within those areas are shown (and optionally shown in a device list).

[0194] Fig. 11 shows a method 1100 for determining a current location of a mobile device and displaying the current location, and includes steps S41 and S42. The processing unit 11 , 21 may be configured to determine, in step S41 , a current location of the mobile device 2. The current location of the mobile device 2 may be determined using a known installed position of at least one HVAC field device 1 with which the mobile device 2 has exchanged a UWB signal and a relative position of the mobile device 2 with respect to the HVAC field device 1. Additionally or alternatively, the current location of the mobile device 2 may be determined using a plurality of known installed positions of a plurality of HVAC field devices with which the mobile device 2 has exchanged one or more UWB signals, and a plurality of distances and / or angles of arrival between the mobile device 2 and the HVAC field devices 1 , respectively. The current location of the mobile device 2 may also be determined from the positioning information.

[0195] In an embodiment, the current location of the mobile device 2 is determined in the processing unit 21 of the mobile device.

[0196] In another embodiment, the current location of the mobile device 2 is determined in the HVAC field device 1 and subsequently transmitted, in a UWB transmission, to the mobile device 2.

[0197] In step S42, the current location of the mobile device 2 is displayed on the map, the map being displayed on the display 25 of the mobile device 2 as described above with reference to step S33.

[0198] In an optional step S43, the mobile device 2 is configured to generate and display a route. The route may be a path to be followed by the technician 6 between the current location of the mobile device 2 and the position of at least one of the HVAC field devices 1. In an embodiment where multiple HVAC field devices 1 are displayed on the map, the route may be generated as a path for the technician 6 between the current location of the mobile device 2 and each of the multiple HVAC field devices 1 in sequence, such that the technician 6 may follow the route from a current position to a first HVAC field device 1 and then on to a second HVAC field device 1 and so on and so forth, until the route is finished. In particular, the mobile device 2 may generate the route such that a total distance of the path is minimized or otherwise optimized such that the technician 6 can move between the current location and the multiple HVAC field devices 1 most efficiently, for example in the least amount of time. In particular, the generation of the route may take into consideration the accessibility of the HVAC field devices 1. For example, the route may be generated such that HVAC field devices 1 which are accessible only by ladder are sequentially arranged on the route. That way, the technician 6, following the route, may attend to all HVAC field devices 1 requiring ladder access together.

[0199] Additionally or alternatively to displaying the route, the mobile device 2 may be configured to display an directional indicator, for example including an arrow and / or an altitude indicator, indicative of a radial direction (e.g. a horizontal and / or a vertical direction) in which the HVAC field device 1 next in a sequence of HVAC field devices 1 is located. In addition to the directional indicator, the mobile device 2 may also be configured to display one or more distances to the next HVAC field device 1 , including, for example, a horizontal distance and a vertical distance.

[0200] In an embodiment, the route is generated only for a subset of the HVAC field devices 1. In particular, HVAC field devices 1 may be omitted from the route according to their current status information (the status information relates to a device status of the HVAC field device 1). For example, if the current work-flow relates to installing HVAC field devices 1 , then the route will be generated omitting HVAC field devices 1 which are already installed. Similar considerations apply for work-flows related to configuration, commissioning, and / or testing of the HVAC field devices 1 .

[0201] In an embodiment, the route is generated such that HVAC field devices 1 with particular status information are prioritized. The particular prioritization may depend on the particular work-flow or action which the technician 6 is currently performing. For example, in a work-flow related to maintenance, HVAC field devices 1 requiring more extensive or urgent maintenance may be prioritized first. Alternatively or additionally, HVAC field devices 1 requiring replacement may be prioritized first. In an embodiment, the route is generated for a particular area (e.g., a particular room, zone, floor, or building). Thereby, the HVAC field devices 1 in the particular area may be found efficiently.

[0202] In an embodiment, the route is generated such that HVAC field devices 1 of the same or similar type are sequentially arranged on the route. For example, the route is generated such that all sensors are included first on the route, and subsequently actuators are included on the route.

[0203] Fig. 12 shows a method 1200 for forwarding UWB messages from a first mesh network to a second mesh network, and includes a number of steps S51 to S54. In step S51 , the mobile device 2 receives a first UWB message from a first HVAC field device 1 , wherein HVAC field device 1 belongs to a first group of HVAC field devices 1 which have established a first mesh network M1 (see also Fig. 3).

[0204] In step S52, the mobile device 2 is configured to determine whether the first UWB message is a mesh network broadcast message. Specifically, the first UWB message includes a message header and a message body. The mobile device 2 is configured to inspect the message header, the message header providing information as to whether the first UWB message is a broadcast message or not. For example, the message header can include a character string or type relating to a type of message. The message types can include, for example, a beacon message and a broadcast message.

[0205] In step S53, the mobile device 2 is configured to generate a second UWB message including the message header and the message body of the first UWB message. The message body of the second UWB message includes positioning information of the first HVAC field device 1. The positioning information is provided either in the first UWB message received by the mobile device 2, or the positioning information is generated in the mobile device 2 using transmission properties of the first UWB message.

[0206] In step S54, the mobile device 2 is configured to transmit the second UWB message to a second HVAC field device T (see Fig.3) belonging to a second mesh network M2.

[0207] Fig. 13 shows a method 1300 for forwarding a data package from a server 5, e.g. a cloud-based server, to an HVAC field device using a mobile device, and includes a number of steps S61 to S63. In step S61 , the mobile device 2 receives, from the server 5, via a wireless communications network using the wireless communications module 26, a data package. The data package comprises configuration parameters for the HVAC field device 1. The data package may, additionally or alternatively, comprise a software and / or a firmware update. The data package may be 'pushed' by the server 5, or the data package may be requested ('pulled') by the mobile device 2. The data package may be encrypted such that the mobile device 2 cannot access the configuration parameters. In particular, the data package may be encrypted such that it may be unencrypted using a cryptographic key stored, for example, in the HVAC field device 1.

[0208] In step S62, the mobile device 2 stores the data package in the memory of the processing unit 21 of the mobile device 2 or in a memory separate to the processing unit 21 of the mobile device 2. The data package therefore becomes available for forwarding to the HVAC field device 1 even if the mobile device 2 no longer has an active connection to the wireless communications network over which the data package was received, such as when the mobile device 2 is inside a building without WLAN or mobile radio reception.

[0209] In step S63, the mobile device 2 transmits the data package to the HVAC field device 1. The mobile device 2 can be configured such that the data package is transmitted to the HVAC field device 1 only if the data transmission rate of the UWB connection is sufficiently high. In particular, only if the data transmission rate of the UWB connection satisfies a pre-determined transmission speed threshold, and / or if the data transmission rate of the UWB connection is high enough that the data package may be transmitted in a pre-determined period of time. Additionally or alternatively, the data package transmission may depend on a distance between the mobile device 2 and the HVAC field device 1 being smaller than a pre-determined distance threshold. Thereby, the chances of the data package not being transmitted in its entirety are reduced.

[0210] In an embodiment, the mobile device 2 may be configured to receive, from the HVAC field device 1 , a data log, comprising a list of events, status updates, warnings and / or errors recorded in the memory of the HVAC field device 1 . Additionally or alternatively, data including KPIs may also be received from the HVAC field device 1. The mobile device 2 is configured to store the data log in the memory of the processing unit 21 of the mobile device 2. The mobile device 2 is configured to transmit the data log to the server 5 via the wireless communications network using the wireless communications module 26.

[0211] Fig. 14 shows a method 1400 for autonomous interaction between a HVAC field device 1 and a mobile device 2, including a number of steps S71 , S72 and optionally steps S73 to S75. The method 1400 may be performed without explicit interaction between the technician 6 and the mobile device 2. In particular, the method 1400 is preferably performed as a background task of an App installed on a mobile device 2 (i.e. in the form of a smart phone), the method 1400 being performed while the technician 6 in possession of the mobile device 2 moves throughout the facility in which the HVAC field devices 1 are present. In step S71 , the mobile device 2 receives device information of the HVAC field device 1 transmitted by the HVAC field device 1 in one or more UWB messages. The device information includes at least a device identifier of the HVAC field device 1 . At least some of the device information may further be received from the gateway device 4 and / or the server 5 upon the mobile device 2 querying the gateway device 4 and / or the server 5, respectively, by way of a query message including the device identifier. Step S71 is similar to step S3 previously described in relation to Fig. 6.

[0212] In addition to the device information, the mobile device 2 may receive further device information from the particular HVAC field device 1 related to one or more further HVAC field devices 1 within communicative range of the particular HVAC field device 1 , in particular a communication status of whether the one or more further HVAC field devices 1 are able to communicate via UWB properly. In particular, the further device information includes one or more device identifiers and device information of the one or more further HVAC field devices 1. For example, the further device information may indicate that the one or more further HVAC field devices 1 cannot communicate properly, thereby providing information to the mobile device 2 enabling the technician 6 to take action. For example, the further device information may include status information related to a commissioning status of the one or more further HVAC field devices 1. Thereby, it is not necessary for the mobile device 2 to be in direct communicative range with every HVAC field device 1 of the facility to gather device information of the HVAC field devices of the facility. As long as the HVAC field devices 1 are connected to each other in a mesh network and the mobile device 2 is in communicative connection with at least one of the HVAC field devices 1 , device information of all the HVAC field devices 1 connected to each other via the mesh network may be transmitted to the mobile device 2.

[0213] In an embodiment, the HVAC field device 1 transmits the device information including updated positioning information, in particular dependent on whether a position of the HVAC field device 1 has changed, for example changed with respect to a position of the HVAC field device 1 as defined in the BIM. The position of the particular HVAC field device 1 may be determined using one or more UWB messages exchanged between the particular HVAC field device 1 and one or more further HVAC field devices 1 and / or UWB messages exchanged between the particular HVAC field device 1 and the mobile device 2.

[0214] In step S72, the mobile device 2 processes status information of the HVAC field device 1 included in the device information. The status information indicates, for example, whether the HVAC field device 1 requires attention. The status information may include indicators such as icons, as well as messages or other forms of information, relating to the current status of the HVAC field device 1. For example, the status information may be indicative of a malfunction of the HVAC field device 1 .

[0215] In an embodiment, the mobile device 2 stores the device information, in particular status information of the device information indicative of whether the HVAC field device 1 has been commissioned or not. Thereby, a record is generated of the current status of the HVAC field device 1 of the facility. By moving through the facility, the technician (specifically, the mobile device 2 which is possessed by the technician 6) gathers and records the status information of the HVAC field devices 1.

[0216] In an embodiment, the mobile device 2 forwards the device information, including the status information, to the gateway device 4 and / or the server 5 for further processing or storage.

[0217] The mobile device 2 is configured to determine whether the device information, in particular the status information, indicates that the HVAC field device 1 (or one or more further HVAC field devices 1) is not functioning properly. In particular, the mobile device 2 is configured to determine whether the device information indicates that the technician 6 must immediately, or in the near future, attend to the HVAC field device 1. The mobile device 2 may determine whether the device information is not functioning properly according to KPIs and a defined set of rules. For example, if the status information includes a warning message, the mobile device 2 determines that the HVAC field device 1 is not functioning properly.

[0218] In the optional step S73, the mobile device 2 displays a notification on the display 25 of the mobile device 2. The notification may be in the form of a notification, which is a message displayed overlaid on the graphical user interface on the display 25, such that the notification (and any message it may contain) is brought to the immediate attention of the technician 6. The notification may be accompanied by a vibration, sound, or other manner of notifying the technician 6, such as to further draw the attention of the technician 6 to the notification.

[0219] The notification is indicative of the HVAC field device 1 requiring immediate attention, for example due to the HVAC field device 1 not functioning properly.

[0220] In an optional step, the mobile device 2 may forward the device information to the server 5. The mobile device 2 may also download a data package for the HVAC field device 1 as described in method 1300 with reference to Fig. 13.

[0221] In optional step S74, which is analogous to step S2 of method 600, positioning information of the HVAC field device 1 is determined, in particular using the UWB message(s) received in step S71 and / or a further UWB message exchange between the mobile device 2 and the HVAC field device 1 , for example according to methods 700 and / or 800. This step may be performed upon the technician 6 interacting with the notification displayed in step S73. In optional step S75, device information and / or positioning information of the HVAC field device 1 is displayed on the display 25 of the mobile device 2. This step may be performed upon the technician 6 interacting with the notification displayed in step S73. Step S75 is analogous to step S4 described herein with reference to method 600 and similar considerations apply.

[0222] Fig. 15 shows a flow diagram illustrating a method 1500 which includes an exemplary sequence of steps S81 to S83 for receiving positioning information and device information of further HVAC field devices 1 and displaying this information on the mobile device 2. The method 1500 provides for a quick and efficient provision of positioning information and device information of HVAC field devices 1 of the facility 3.

[0223] In step S81 , the mobile device 2 receives, from a server 5, e.g. a cloud-based server, positioning information and device information of further HVAC field devices 1 of the facility. The positioning information and device information may be received via the Internet, for example using a wireless connection of the mobile device 2 (e.g. WLAN or a mobile radio network). The positioning information and device information may be received prior to the mobile device 2 being in communicative range (i.e. , UWB communicative range) with an HVAC field device 1. For example, the positioning information and device information is received prior to the technician 6 entering the facility 3.

[0224] The positioning information and device information may have been established using UWB signals exchanged between HVAC field devices 1 and may include UWB signal exchange with a gateway device 4. The positioning information may include positions of the HVAC field devices 1 relative to one another, in particular in the form of a two-dimensional or three-dimensional spatial arrangement. The positioning information may include an absolute position and / or an absolute orientation, i.e. with reference to a building reference location and / or a building reference orientation as defined in the BIM, for example, or the positioning information may be relative, i.e. defining relative positions between the HVAC field devices 1 (and optionally the gateway device 4). The positioning information may have been generated in the gateway device 4 and forwarded to the server 5, or generated in the server 5 itself.

[0225] In step S82, the current location of the mobile device 2 is determined. The current location of the mobile device 2 may be determined using UWB signals exchanged with one or more HVAC field devices 1 of the facility. Alternatively or additionally, the current location may be determined using another positioning system, for example the GNSS and / or an indoor positioning system.

[0226] In step S83, the positioning information and device information of at least one of the further HVAC field devices is displayed on the display 25 of the mobile device 2 using the current location of the mobile device. In particular, the current location is used to determine the relative position of the displayed HVAC field devices 1. The positioning information and device information of at least one of the further HVAC field devices may be displayed on a map as described above with reference to method 1000, in particular step S33.

[0227] In an embodiment, the positioning information and the device information is transmitted, by the server 5, to the mobile device 2 upon the mobile device 2 providing, to the server 5, location information of the mobile device 2 (e.g., determined using a global navigation satellite system (GNSS)) indicating that the mobile device 2 is located at or within a defined distance of the facility 3. Thereby, the necessary positioning information and device information required by the mobile device 2 at the particular facility 3 is provided by the server 5, e.g. cloud-based server, automatically on demand. In an embodiment, the positioning information and the device information may be included in the mapping information as described above with reference to method 1000.

[0228] Fig. 16 shows a schematic representation of top-down view of a map of a facility 3 in which a technician 6 in possession of a mobile device 2 is in the vicinity and communicative range of multiple HVAC field devices 1. Additionally, a gateway device 4, which may also be considered as an HVAC field device 1 in some embodiments, is also depicted.

[0229] Figs. 17 to 22 show schematic representations of a display 25 of a mobile device showing both a device map 251 and a device list 252. The device map 252 shows a map including a top-down two-dimensional relative spatial arrangement of HVAC field devices 1 and the gateway device 4. Additionally, the map shows the relative spatial location 254 of the technician 6 in possession of the mobile device. The device list 252 comprises entries for each of the HVAC field devices 1 , as well as the gateway device 4, each entry including a proximity, a serial number, a device type, and other KPIs. The list 252 of HVAC field devices 1 is sorted according to proximity in ascending order. As indicated in the figures, the device list may be sorted according to proximity (i.e. , distance in meters), serial number, device type, or other KPIs.

[0230] Fig. 18 shows the display 25 with an active filter including a distance threshold. The distance threshold is set to approximately 10 m. A circular area centered on the position 254 of the technician 6 and having a radius of 10 m is indicated on the map 251. Additionally, the device list 252 shows only HVAC field devices 1 with a proximity less than the distance threshold of 10 m. Fig. 19 shows the display 25 with an active filter including an angular sector (for example, a circular sector). The angular sector is defined to have an opening angle of approximately 45°. The angular sector originates at the position 254 of the technician 6 and extends in a forward direction based on an orientation of the mobile device 2 and / or direction of movement of the technician 6, for example. The device list 252 shows only those HVAC field devices 1 which lie within the angular sector. In an embodiment, the angular sector is three-dimensional, extending not only in a horizontal direction but also in a vertical direction. For example, the angular sector may be 45° and 45° tall. Alternatively, the angular sector may be defined as a three-dimensional angular sector (for example, a spherical sector) having a defined opening angle, for example 45°. A distance threshold may be applied in addition to the angular filter.

[0231] Fig. 20 shows the display 25 in a scenario including two device gateways 4A, 4B. The HVAC field devices 1 in this scenario form two separate mesh networks, each connected to one particular gateway device 4A, 4B. The device list 252 is configured such that the HVAC field devices 1 are grouped according to which gateway device 4A, 4B they are communicatively connected to

[0232] Fig. 21 shows the display 25 wherein the map 251 includes a route 255 indicated by a dashed line which leads to an HVAC field device 1 with a warning indicator 256, the warning indicator indicative of the HVAC field device 1 requiring attention. As described above, the route 255 may indicate a path to be taken by the technician 6 to find the HVAC field device requiring attention.

[0233] Fig. 22 shows the display 25 in which, instead of a map, an arrow 258 is displayed indicative of a direction in which a selected device 257 is located. The selected device 257 is also indicated on the device list 252 with a warning symbol 260. The arrow 258 pref- erably indicates a radial direction and optionally includes a distance to the selected device 257. The display 25 further indicates an altitude 259 of the selected device 257, thereby indicating that reaching the selected device 257 may require a ladder or other means. The above-described embodiments of the disclosure are exemplary and the person skilled in the art knows that at least some of the components and / or steps described in the embodiments above may be rearranged, omitted, or introduced into other embodiments without deviating from the scope of the present disclosure.

Claims

CLAIMS1. A method for finding a HVAC field device (1 , T, 1A, 1 B, 1 C, 1 D) using a mobile device (2), the method comprising the steps of: exchanging (S1) ultra-wideband signals between the HVAC field device (1 , T, 1A, 1 B, 1 C, 1 D) and the mobile device (2); determining (S2) positioning information related to a position of the HVAC field device (1 , T, 1A, 1 B, 1C, 1 D), using transmission properties of the ultra-wideband signals; receiving (S3), in the mobile device (2), device information of the HVAC field device (1 , T, 1A, 1 B, 1C, 1 D); and displaying (S4), on a display (25) of the mobile device (2), the device information and the positioning information for finding the HVAC field device (1 , T, 1A, 1 B, 1C, 1 D).

2. The method according to claim 1 , further comprising transmitting (S5), from the mobile device (2) to the HVAC field device (1 , T, 1A, 1 B, 1C, 1 D), configuration parameters for the HVAC field device (1 , T, 1A, 1 B, 1C, 1 D).

3. The method according to one of claims 1 or 2, wherein the method comprises: exchanging (S21) ultra-wideband signals between each of a plurality ofHVAC field devices (1 , T, 1A, 1 B, 1C, 1 D) and the mobile device (2);determining (S22) positioning information for each of the plurality of HVAC field devices (1 , T, 1A, 1 B, 1C, 1 D); receiving (S23), in the mobile device (2) device information of the HVAC field devices (1 , T, 1A, 1 B, 1C, 1 D) from the HVAC field devices (1 , T,IA, 1 B, 1C, 1 D); optionally, receiving (S24), in the mobile device (2) via a user interface (24), information that identifies a particular HVAC field device (1 , T, 1A,I B, 1C, 1 D); and displaying (S25), on a display (25) of the mobile device (2), the device information and the positioning information of the particular HVAC field device (1 , T, 1A, 1 B, 1C, 1 D) for finding the particular HVAC field device (1 , T, 1A, 1 B, 1C, 1 D).

4. The method according to claim 3, the method further comprising transmitting (S26), from the mobile device (2) to the particular HVAC field device (1 , T, 1A, 1 B, 1C, 1 D), configuration parameters for the particular HVAC field device (1 , T, 1A, 1 B, 1C, 1 D).

5. The method according to one of claims 1 to 4, wherein the method further comprises: receiving (S31), in the mobile device (2), mapping information of at least part of a facility (3) in which the HVAC field device(s) (1 , T, 1A, 1 B, 1C, 1 D) is situated;rendering (S32), in the mobile device (2), a map using the mapping information; and displaying (S33), on the display (25) of the mobile device (2), the map and positions of the HVAC field device(s) (1 , T, 1A, 1 B, 1C, 1 D) on the map, using the positioning information of the HVAC field device(s) (1 , T, 1A, 1 B, 1C, 1 D).

6. The method according to claim 5, wherein the method further comprises: determining (S41) a current location of the mobile device (2); and displaying (S42), on the display (25) of the mobile device (2), the current location of the mobile device (2) on the map.

7. The method according to one of claims 1 to 6, wherein the method further comprises: receiving, in the HVAC field device (1 , T, 1A, 1 B, 1C, 1 D), ultra-wideband signals from a further HVAC field device (1 , T, 1A, 1 B, 1C, 1 D), the further HVAC field device (1 , T, 1A, 1 B, 1C, 1 D) not being in direct communication range with the mobile device (2); and forwarding, by the HVAC field device (1 , T, 1A, 1 B, 1C, 1 D), the ultra- wideband signals received from the further HVAC field device (1 , T, 1A, 1 B, 1 C, 1 D) to the mobile device (2).

8. The method according to one of claims 1 to 7, wherein exchanging ultra-wide- band signals comprises:transmitting (S11 , S1 T), from the mobile device (2) to the HVAC field device (1 , T, 1A, 1 B, 1 C, 1 D), an ultra-wideband request message; receiving (S12, S12’), in the HVAC field device (1 , T, 1A, 1 B, 1 C, 1 D), the ultra-wideband request message; generating (S13, S13’), in the HVAC field device (1 , T, 1A, 1 B, 1C, 1 D), an ultra-wideband response message, in a pre-determined processing time; and receiving (S15, S15’), in the mobile device (2) from the HVAC field device (1 , T, 1A, 1 B, 1 C, 1 D), the ultra-wideband response message; wherein determining (S2,) the positioning information comprises calculating one or more of: at least one distance between the mobile device (2) and the HVAC field device (1 , T, 1A, 1 B, 1C, 1 D) using a time difference between transmission of the request message and reception of the response message and the pre-determined processing time or at least one angle between the mobile device (2) and the HVAC field device (1 , T, 1A, 1 B, 1 C, 1 D) using a phase difference of arrival, the phase difference of arrival calculated using one or more of: the reception of the request message or the reception of the response message.

9. The method according to claim 8, wherein the mobile device (2) includes two or more ultra-wideband antennas and the method comprises:receiving, in the mobile device (2) from the HVAC field device (1 , T, 1A, 1 B, 1C, 1 D), the ultra-wideband response message by the two or more ultra-wideband antennas (23) of the mobile device (2); and calculating one or more of: a distance between the HVAC field device (1 , T, 1A, 1 B, 1C, 1 D) and each of the ultra-wideband antennas (23) or at least one angle between the mobile device (2) and the HVAC field device (1 , T, 1A, 1 B, 1C, 1 D) using the phase difference of arrival of the response message at the two or more ultra-wideband antennas (23) of the mobile device (2); and determining the positioning information as a two-dimensional or three-dimensional relative position between the mobile device (2) and the HVAC field device (1 , T, 1A, 1 B, 1C, 1 D) using one or more of: the calculated distance(s) or the calculated angle(s).

10. The method according to one of claims 8 or 9, wherein the HVAC field device (1 , T, 1A, 1 B, 1C, 1 D) includes two or more ultra-wideband antennas (13) and the method comprises: receiving, in the HVAC field device (1 , T, 1A, 1 B, 1 C, 1 D), the ultra-wide- band request message by each of the ultra-wideband antennas (13); calculating: one or more of: a distance between the mobile device (2) and each of the two or more ultra-wideband antennas (13) and / or at least one angle between the HVAC field device (1 , T, 1A, 1 B, 1 C, 1 D) and the mo-bile device (2) using the phase difference of arrival of the request message at the two or more ultra-wideband antennas (13) of the HVAC field device (1 , T, 1A, 1 B, 1C, 1 D); and determining the positioning information as a two-dimensional or three-dimensional relative position between the mobile device (2) and the HVAC field device (1 , T, 1A, 1 B, 1C, 1 D) using one or more of: the calculated distance(s) or the calculated angle(s).

11. The method according to one of claims 1 to 10, further comprising: receiving, in the mobile device (2), positioning information and device information of further HVAC field devices (1 , T, 1A, 1 B, 1C, 1 D) from a server 5; determining a current location of the mobile device (2); and displaying, on a display (25) of the mobile device (2), the positioning information and the device information of at least one of the further HVAC field devices (1 , T, 1A, 1 B, 1C, 1 D) using the current location.

12. The method according to one of claims 1 to 11 , wherein the mobile device (2) includes a range imaging sensor and the method further comprises: generating, in the mobile device (2), a three-dimensional model of at least part of the surroundings of the mobile device (2), using data received from the range imaging sensor; anddisplaying, on the display of the mobile device (2), the three-dimensional model, the three-dimensional model having an overlaid indicator of a position of the HVAC field device (1 , T, 1A, 1 B, 1C, 1 D).

13. A HVAC system including a HVAC field device (1 , T, 1A, 1 B, 1C, 1 D), and a processing unit (11 , 21), wherein the HVAC field device (1 , T, 1A, 1 B, 1C, 1 D) comprises an ultra-wideband communications module (13) configured to exchange (S1) ultra-wideband signals with a mobile device (2) and the processing unit (11 , 21) is configured to: determine (S2) positioning information related to a position of the HVAC field device (1 , T, 1A, 1 B, 1C, 1 D), using transmission properties of the ultra-wideband signals, receive (S3) device information of the HVAC field device (1 , T, 1A, 1 B, 1 C, 1 D) from the HVAC field device (1 , 1A, 1 B, 1C, 1 D), and provide to the mobile device (2) the device information and the positioning information.

14. The HVAC system of claim 13, further comprising the mobile device (2), the mobile device (2) configured to display (S5), on a display (25) of the mobile device (2), the device information and the positioning information for finding the HVAC field device (1 , T, 1A, 1 B, 1C, 1 D)15. The HVAC system of claim 13 or 14, wherein the processing unit (11) is integrated into the HVAC field device (1 , T, 1A, 1 B, 1C, 1 D).

16. The HVAC system of claim 13 or 14, wherein the processing unit is arranged in a gateway device (4) and communicatively coupled to the HVAC field device (1, T, 1A, 1 B, 1C, 1 D).

17. The HVAC system of claim 13 or 14, wherein the processing unit (21) is arranged in the mobile device (2).

18. The HVAC system of claim 13 or 14, wherein the processing unit is arranged in a server (5) and is communicatively coupled to the HVAC field device (1 , T, 1A, 1 B, 1C, 1 D).

19. The HVAC system of one of claims 13 to 18, wherein the HVAC field device (1 , T, 1A, 1 B, 1 C, 1 D) comprises two or more ultra-wideband antennas (13) and the processing unit (11 , 21) is configured to: receive (S11), in the HVAC field device (1 , T, 1A, 1 B, 1C, 1 D), an ultra- wideband request message by each of the ultra-wideband antennas (13); calculate, in the processing unit (11 , 21), one or more of: at least one distance between the mobile device (2) and at least one of the ultra-wide- band antennas (13), respectively, or at least one angle between the HVAC field device (1 , T, 1A, 1 B, 1C, 1 D) and the mobile device (2) using a phase difference of arrival of the request message at the two or more ultra-wide- band antennas (13) of the HVAC field device (1 , T, 1A, 1 B, 1C, 1 D),; and determine, in the processing unit (11 , 21), the positioning information as a two-dimensional or three-dimensional relative position between the mobile device (2) and the HVAC field device (1 , T, 1 A, 1 B, 1 C, 1 D) using one or more of: the calculated distance(s) or the calculated angle(s).

20. The HVAC system of one of claims 13 to 19, wherein the HVAC system comprises a plurality of HVAC field devices (1 , T, 1A, 1 B, 1 C, 1 D) configured to: establish an ultra-wideband mesh communication network (M1 , M2); and exchange ultra-wideband signals between the plurality of HVAC field devices (1 , T, 1A, 1 B, 1C, 1 D); wherein the processing unit (11 , 21) is further configured to: determine, using transmission properties of the ultra-wideband signals exchanged between the plurality of HVAC field devices (1 , T, 1A, 1 B, 1C, 1 D), one or more of: distances or angles between pairs of the plurality of HVAC field devices (1 , T, 1A, 1 B, 1C, 1 D); receive, from each HVAC field device (1 , T, 1A, 1 B, 1C, 1 D), device information; generate a two-dimensional or three-dimensional spatial arrangement of the plurality of HVAC field devices (1 , T, 1A, 1 B, 1C, 1 D) using one or more of: the distance(s) or the angle(s); determine positioning information of the plurality of HVAC field devices (1 , T, 1A, 1 B, 1 C, 1 D) further using transmission properties of the ultra-wide- band signals exchanged between the plurality of HVAC field devices (1 , T, 1A, 1 B, 1C, 1 D) and the mobile device (2) and the spatial arrangement; andtransmit, to the mobile device (2), the positioning information and the device information of the plurality of HVAC devices (1 , 1’, 1A, 1 B, 1 C, 1 D).

21. A computer program product comprising computer program code configured to control a processing unit (11, 21), in particular a processing unit (11 , 21) of an HVAC system according to one of claims 13 to 20, to perform a method according to one of claims 1 to 12.

22. A non-transitory computer readable medium having stored thereon computer program code configured to control a processing unit (11, 21), in particular a processing unit (11 , 21) of an HVAC system according to claim one of claims 13 to 20, to perform a method according to one of claims 1 to 12.

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