Recommended object monitoring system whether to use wireless communication mode

Abstract

A method and communication module for recommending a manner or mode in which a sensor and a communication module of an object monitoring system should communicate. A determination is made as to whether more than a predetermined number of wireless channels have noise levels below a certain threshold. If an affirmative determination is made, a wireless communication mode is recommended. If a negative determination is made, a wireless communication mode is not recommended.

Description

Technical Field

[0001] The present invention relates to the field of object monitoring systems and in particular to a method of communication between a sensor and a communication module of an object monitoring system. Background Art

[0002] Subject monitoring systems are becoming more and more interesting in the medical field. Such systems typically include one or more sensors for measuring medically relevant parameters, which are typically small autonomous devices that can be placed individually at appropriate locations on the body of the subject / patient. The sensors can transmit the measured parameters to a communication module, which can be partially or fully integrated into a patient monitor. The patient monitor can be responsible for displaying, alarming, and recording the parameters measured by the sensors.

[0003] It is desirable to operate sensors in subject monitoring systems wirelessly, thereby setting up a medical body area network (MBAN), as this improves patient comfort. In particular, wireless sensors allow the subject to move freely, and mean that staff do not need to worry about wires getting in the way during an examination (which is a significant source of accidents). Freedom of movement is particularly important in the field of obstetrics, as this allows the monitored mother to move freely (e.g., walk around or change position), thereby reducing pain as labor progresses.

[0004] However, wireless connections are more susceptible to interference than wired connections. In fact, as wireless technology continues to be implemented into everyday devices (i.e., the advent of the Internet of Things), the potential for interference in wireless connections has increased significantly, especially in clinical settings. A particularly complicating factor is that interference may occur intermittently or for short periods of time.

[0005] It is particularly desirable that the communication between the sensor(s) and the communication module for the subject monitoring system use a reliable and undisturbed communication link because, unlike a typical wireless local area network (WLAN), a data packet cannot be resent if it is not received. In a clinical setting, sudden and unexpected data loss can have dangerous and potentially life-threatening consequences, for example, because changes in the patient's condition can go unnoticed. Thus, there is a conflict between the desire for a reliable communication link and the desire for improved patient comfort. Summary of the invention

[0006] The invention is defined by the claims.

[0007] According to an example according to one aspect of the present invention, a method for recommending whether an object monitoring system should use a wireless communication mode to communicate data between at least one sensor and a communication module of the object monitoring system is provided. The method includes: determining at the communication module a first noise value for each of a plurality of channels in which the at least one sensor and the communication module can communicate when the object monitoring system operates in the wireless communication mode; determining the number of qualified channels for wireless communication having the first noise value below a first predetermined threshold; and recommending whether the wireless communication mode should be used based on the determined number of qualified channels.

[0008] The present invention recognizes that a decision can be made as to whether to use wireless communication between a sensor and a communication module of an object monitoring system. However, users of such systems (e.g., caregivers or clinicians) are typically unaware of the possible impairments of wireless transmissions prior to activating a wireless sensor. The concepts described herein implement automatic recommendations as to whether a wireless communication mode is appropriate based on the number of wireless channels having noise below a certain level (i.e., predicted to allow reliable wireless communication). Thus, a wireless communication mode can be recommended only when it is ensured (with a certain degree of probability) that communication between the sensor and the communication module will be reliable. This ensures that when a wireless communication mode is sufficiently reliable, a more comfortable wireless communication mode is recommended.

[0009] In other words, the method determines whether the wireless communication mode will be sufficiently reliable for communication between the sensor and the communication module based on the number of wireless channels determined to be suitable for reliable wireless communication (having noise values ​​below a certain threshold). If the wireless communication mode is considered to be sufficiently reliable, it is recommended (to improve patient comfort), otherwise it is not recommended.

[0010] By way of example, the step of recommending not using the wireless communication mode may include recommending (alternatively) using a wired communication mode. This is because reliable communication takes precedence over patient comfort due to the possible consequences of (one or more) data loss. In some embodiments, the step of recommending not using the wireless communication mode may include recommending the use of a hybrid communication mode, wherein communication between the communication module and a set of sensors uses both wired and wireless communication methods. In some embodiments, the step of recommending not using the wireless communication mode may include recommending that the user use an alternative object monitoring system (e.g., a wired object monitoring system) to monitor the parameters of the object.

[0011] Therefore, a user-friendly recommendation of whether a wireless communication mode is appropriate can be provided without the need for specialized equipment or a technically knowledgeable operator. Specifically, the recommendation can be made before the object monitoring system is used, thereby reducing the possibility of communication interruption during use of the object monitoring system.

[0012] The wireless communication mode may be a mode in which communication between the sensor(s) and the communication module is performed only wirelessly. Other communication modes may include a wired communication mode (in which communication between the sensor(s) and the communication module is performed via wires), a hybrid communication mode (in which some sensors communicate using wires and other sensors communicate wirelessly), and a non-communication / standby mode (in which the communication module and the sensor do not attempt to communicate).

[0013] Preferably, the first noise value comprises a received signal strength indicator RSSI value. The RSSI value is used here to indicate whether the channel is occupied or used by another system (e.g., a (another) medical body area network in close proximity). By evaluating whether a channel is in use, an effective prediction of possible interference on the channel can be made. Therefore, using the RSSI value as a noise measurement of the channel enables the evaluation of the use of available or possible wireless communication to be performed accurately, while taking into account possible interference sources. In particular, the presence of potential interference sources for wireless communication can be identified.

[0014] Examples of suitable RSSI values ​​include: a maximum RSSI value (within a particular time period), a minimum RSSI value (within a particular time period), a range of RSSI values ​​(within a particular time period), or an average RSSI value (within a particular time period).

[0015] Preferably, the first noise value comprises an average RSSI value obtained over a period of at least 30 minutes. Interference sources in the channel may be intermittent or periodic. Therefore, it is preferred to evaluate RSSI values ​​over a long period of time. When compared to using only the instantaneous value of RSSI, this reduces the possibility of missing the presence of an intermittent interference source and recommending a wireless communication mode even though it may actually be unreliable.

[0016] Preferably, the average RSSI value is obtained over a period of at least one hour, even more preferably at least six hours, even more preferably at least one day. Longer periods (e.g., >30 minutes) for obtaining RSSI values ​​enable interference sources that communicate only periodically (as is common in clinical environments) to be identified, thereby increasing the reliability of determining whether the wireless communication mode is sufficiently reliable.

[0017] The step of recommending whether the wireless communication mode should be used may include: if the number of qualified channels is lower than a first predetermined number, recommending not using the wireless communication mode; and if the number of qualified channels is higher than or equal to the first predetermined number, recommending using the wireless communication mode.

[0018] Therefore, the number of available or qualified channels defines whether the wireless communication mode is recommended. When the number of qualified channels is low, it is determined that the wireless communication mode will be unreliable and therefore it is not recommended. When the number of qualified channels is high, it is determined that the wireless communication mode is sufficiently reliable and therefore it is recommended.

[0019] In some examples, the first predetermined number may be 1. Therefore, embodiments can effectively predict whether there are any available channels for wireless communication in which to communicate reliably. However, in other embodiments, the first predetermined number may be different. For example, the first predetermined number may be 2 or 5 or 10. Preferably, the first predetermined number is not greater than 5 and / or not less than 1. The first predetermined number may, for example, depend on the number of channels required for communication between the sensor and the communication module. In other examples, the number of channels may be greater than 1 so that the communication between (one or more) sensors and the communication module can switch channels (e.g., using smart hopping techniques) in the event of an unexpected or previously undetected interference source. Other reasons for selecting a higher predetermined number will be apparent to those skilled in the art. The higher the first predetermined number, the greater the probability that the wireless communication mode will actually be reliable.

[0020] In some examples, the first predetermined number is a fraction or percentage of the number of the plurality of channels, for example, not less than 20% or 40% of the plurality of channels. The number of the plurality of channels may depend on the wireless communication protocol used. For example, Provides division of the frequency band into 16 separate channels, while About 79 different channels may be provided. The first predetermined number may be a minimum number for ensuring (with a certain probability) reliable and continuous wireless communication, for example 20% or 40% of the total number of channels.

[0021] The step of recommending whether the wireless communication mode should be used may include: in response to the number of qualified channels being higher than a second predetermined number: determining whether there are at least three adjacent qualified channels; in response to determining that there are at least three adjacent qualified channels, recommending the use of the wireless communication mode; and in response to determining that there are not at least three adjacent qualified channels: recommending that the wireless communication mode can be used, but may be unreliable; or recommending not to use the wireless communication mode.

[0022] For better resolution and greater certainty in predictions about the reliability of wireless communications, the method may determine if there are at least three adjacent qualified channels. Communications from possible wireless interference sources within a particular channel may bleed into other channels (e.g., if they operate according to a different communication protocol than the MBAN, which communication protocol may be formed by the object monitoring system). By ensuring that there are at least three adjacent qualified channels, the probability is increased that at least one of these channels (i.e., the center channel(s)) will have sufficiently low interference for reliable communications.

[0023] In other words, there is no guarantee that a qualified channel will not suffer interference due to possible infiltration from adjacent channels. However, by ensuring that at least three adjacent channels exist before recommending a wireless network, the probability is increased that at least one of the identified qualified channels will not suffer wireless interference.

[0024] The second predetermined number is preferably greater than the first predetermined number, but this is not essential. To improve the efficiency of performing the method, the second predetermined number may be no less than 2 (because the subsequent steps include determining whether there are three adjacent channels).

[0025] The step of recommending whether to preferably use the wireless communication mode includes: in response to the number of qualified channels being equal to or lower than the second predetermined number: if the number of qualified channels is lower than the first predetermined number, recommending not to use the wireless communication mode; and if the number of qualified channels is higher than or equal to the first predetermined number, recommending that the wireless communication mode can be used, but the wireless communication mode may be unreliable.

[0026] Therefore, if there are not at least three adjacent channels, the probability that a channel will be available for reliable wireless communication is reduced.Therefore, it cannot be guaranteed (with a certain degree of probability) or predicted that the wireless communication mode will be reliable.

[0027] The step of recommending the use of a wireless communication mode in response to determining that there are at least three adjacent qualified channels may include recommending the use of a wireless communication mode in which wireless communication is performed on a qualified channel disposed directly between two other qualified channels.

[0028] Therefore, it is recommended to use a particular channel for a sub-mode of wireless communication when there are three adjacent channels. This increases the probability that the wireless communication will be reliable because it is recommended to use the channel that is most likely to be reliable.

[0029] The method preferably includes determining, at the communication module, a time occupancy value for each of the multiple channels, the time occupancy value being a length of time during which a second noise value for each of the channels is above a second predetermined threshold, wherein the step of determining the number of qualified channels for wireless communication includes determining the number of qualified channels having the first noise value below the first predetermined threshold and the occupancy time value below a third predetermined threshold.

[0030] Thus, the length of time that the noise value is above a certain threshold is used to identify whether a certain channel is suitable for wireless communication (i.e., not too noisy). The first noise value may be an average received signal strength indicator RSSI value, and the second noise value may be an (instantaneous) received signal strength indicator RSSI value.

[0031] In an embodiment, the step of determining at the communication module is performed only if the communication module is not in wireless communication with the at least one sensor.Thus, the recommendation may be performed before the subject monitoring system sets the MBAN or is monitoring a patient / subject parameter.

[0032] In other embodiments, the determining step may be performed while the communication module is communicating wirelessly with the at least one sensor, for example, by using a time division multiplexing system or by using a separate dedicated wireless transceiver.

[0033] In at least one embodiment, the step of recommending a communication mode may include generating a user-perceivable output of the recommended communication mode, such as an audio, visual (e.g., text or traffic light output), or tactile output (e.g., vibration). Such an output will assist the user in performing the technical task of selecting or controlling the communication mode of the subject monitoring system to ensure appropriate communication reliability while taking into account (e.g., for subject comfort) the desire to use the wireless communication mode.

[0034] A method of selecting (or entering) a communication mode to be used by an object monitoring system for communicating between at least one sensor and a communication module is also proposed. The method comprises: recommending whether a wireless communication mode should be used by performing any of the previously described methods; and if the wireless communication mode is recommended (i.e., in response to the recommendation) to use the wireless communication mode, selecting (or entering) the wireless communication mode. Preferably, if the wireless communication mode is not recommended to be used, the wireless communication mode is not selected or entered, i.e., an alternative communication mode, such as a wired / hybrid / standby mode, is entered instead.

[0035] Thus, a recommended communication mode may be automatically set in an object monitoring system. Thus, a receiver and / or sensor may be automatically set to operate in a wireless mode to determine whether a wireless (e.g., MBAN) network is established. This reduces the likelihood of user error from selecting an inappropriate communication mode.

[0036] In some embodiments, the step of recommending not using the wireless communication mode may include disabling a wireless transceiver (eg, of the communication module) thereby preventing the object monitoring system from operating in the wireless communication mode. This may be performed using appropriate software.

[0037] According to an example according to an aspect of the invention, there is also provided a computer program comprising code means for implementing any of the described methods when said program is run on a processing system, such as a computer.

[0038] According to an example according to an aspect of the present invention, there is provided a communication module for an object monitoring system, the communication module being capable of communicating with at least one sensor when the object monitoring system operates in a wireless communication mode.

[0039] The communication module includes a processing system, which is suitable for: determining a first noise value for each of a plurality of channels in which the at least one sensor and the communication module can communicate when operating in a wireless communication mode; determining a number of wireless communication channels having the first noise value below a predetermined threshold; and recommending whether the object monitoring system uses the wireless communication mode based on the determined number of wireless communication channels.

[0040] The processing system may be adapted to determine the first noise value for each of the plurality of channels only when the communication module is not in wireless communication with the at least one sensor.

[0041] An object monitoring system is also proposed, comprising: the communication module described previously; and one or more sensors, the one or more sensors are used to monitor the object, when the object monitoring system operates in a wireless communication mode, the one or more sensors can wirelessly communicate with the communication module.

[0042] These and other aspects of the invention will be apparent from and elucidated with reference to the embodiment(s) described hereinafter. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] For a better understanding of the invention and in order to more clearly show how it may be implemented, reference will now be made, by way of example only, to the accompanying drawings, in which:

[0044] Figure 1 An object monitoring system is illustrated for understanding the background of embodiments of the present invention;

[0045] Figure 2 is a flow chart illustrating a method according to an embodiment of the present invention;

[0046] Figure 3 is a graph illustrating a plurality of channels;

[0047] Figure 4 is a flow chart illustrating a method according to another embodiment of the present invention;

[0048] Figure 5 is a graph illustrating different noise values ​​for a plurality of channels; and

[0049] Figure 6 A communication module for an object monitoring system according to an embodiment of the present invention is illustrated. DETAILED DESCRIPTION

[0050] The present invention will be described with reference to the accompanying drawings.

[0051] It should be understood that the detailed description and specific examples, while indicating exemplary embodiments of the apparatus, system and method, are intended for illustration purposes only and are not intended to limit the scope of the invention. These and other features, aspects and advantages of the apparatus, system and method of the invention will be better understood from the following description, claims and drawings. It should be understood that the drawings are schematic only and are not drawn to scale. It should also be understood that the same reference numerals are used throughout the drawings to represent the same or similar components.

[0052] According to the concepts of the present invention, a method is provided for recommending in what manner or mode a sensor and a communication module of an object monitoring system should communicate. A determination is made as to whether more than a predetermined number of wireless channels have a noise level below a certain threshold. If an affirmative determination is made, a wireless communication mode is recommended. If a negative determination is made, a wireless communication mode is not recommended.

[0053] Embodiments are based at least in part on the recognition that it is preferable to use wireless sensors to monitor subjects for comfort, but such wireless sensors may not be completely reliable. It is also recognized that users of subject monitoring systems are generally unable to understand or decipher when wireless communication will be reliable. Therefore, it is proposed that if a wireless connection can be made and maintained reliably, then a wireless communication mode is recommended, otherwise a wireless communication mode is not recommended (e.g., a wired communication mode may be recommended instead). Embodiments take into account the need or desire for continued reliability of communication between a sensor and a communication module, while being aware of the desire for improved patient comfort.

[0054] The illustrative embodiments may be employed, for example, in a clinical setting, such as obstetrics, to minimize discomfort to a (pregnant) subject while ensuring that communications are reliable.

[0055] A "channel" or "radio channel" is a predetermined frequency range, typically centered around a center frequency that can be used to identify the channel. Typically, the frequency range covered by a particular channel is defined by a wireless communication protocol (e.g., the IEEE 802.11 protocol), which may be able to define the center frequency and width of the channel.

[0056] Figure 1 A subject monitoring system is illustrated for understanding the context in which embodiments may be employed. The subject monitoring system is herein adapted for use in obstetrics, but other uses are contemplated.

[0057] The subject monitoring system is adapted to monitor one or more parameters of the subject 10. One or more sensors 11A, 11B capture one or more parameters of the subject, such as fetal heart rate, uterine activity, maternal pulse, etc. The one or more sensors 11A, 11B may be attached to the subject using one or more elastic bands (as shown) or using a suitable adhesive (e.g., a weak adhesive or a sticky adhesive). Each sensor may, for example, capture a different parameter of the subject, or more than one sensor may work together to monitor one or more specific parameters (e.g., two separate sensors may monitor fetal heart rate to improve the accuracy and reliability of the monitored parameter).

[0058] Each sensor 11A, 11B transmits a corresponding monitoring signal carrying the monitored parameter to a communication module 12, which in turn is directly connected to a patient monitor 13. The patient monitor 13 records the monitoring signal(s) on a memory. The patient monitor may provide a visual display 13A of the patient's current parameters (e.g., displaying the current fetal heart rate) and / or provide a printout 13B of the parameters monitored by the sensors to enable a clinician to understand the long-term progress of the subject.

[0059] In some embodiments, the communication module 12 is integrated into the patient monitor 13 so as to form a part of the patient monitor 13. In other embodiments, as shown, the communication module 12 is separate from the patient monitor 13 but is capable of communicating therewith, for example, via one or more cables. The communication module 12 may be separate so as to be partially integrated into the patient monitor and partially formed as a separate component.

[0060] At least some of the one or more sensors 11A, 11B of the illustrated object monitoring system and the communication module 12 are capable of communicating using at least wireless communication methods. For example, at least some of the one or more sensors may be capable of communicating using only wireless communication methods (and may not be able to communicate using wires).

[0061] In an embodiment, at least some (others) of the object monitoring system's one or more sensors 11A, 11B are only able to communicate via wires.

[0062] In some embodiments, at least some of the one or more sensors are capable of communicating with the communication module using both wireless communication methods and wired communication methods (although preferably only one is selected at any given time). Thus, some sensors may be switchable between wireless and wired communication modes (e.g., capable of communicating wirelessly or using wires), effectively being hybrid sensors.

[0063] Thus, any given sensor may be capable of communicating in wireless and / or wired communication modes.

[0064] Not all sensors used in an object monitoring system need to be "active" (i.e., in communication with the communication module) at a given time to enable monitoring of an object. For example, an object monitoring system may include a first group of one or more wireless sensors and a second group of one or more wired sensors, wherein, at a given time, only one of the first group and the second group is active and used to monitor an object (e.g., depending on the activated communication mode). Of course, a combination of wired and wireless sensors may be used to monitor an object.

[0065] Other object monitoring systems not employing the present invention may only include sensors that are capable of communicating using wires.The present invention relates to an object monitoring system including at least some sensors that are capable of communicating wirelessly with a communication module.

[0066] Thus, the object monitoring system can operate at least in a wireless communication mode, wherein the sensor(s) 11a, 11b and the communication module 12 communicate using a wireless communication protocol, thereby effectively establishing a medical body area network (MBAN). Preferably, in the wireless communication mode, only sensors with wireless communication capabilities can communicate with the communication module.

[0067] The object monitoring system may also operate in a non-communication mode, in which the object monitoring system is unable or prohibited from attempting to communicate with the sensor. This non-communication mode may be labeled a "standby" mode.

[0068] In some embodiments, the object monitoring system may further operate in a wired communication mode, wherein the sensor(s) 11A, 11B and the communication module 12 communicate via one or more cables. Preferably, in the wired communication mode, only sensors capable of communicating via wired communication are able to communicate with the communication module (e.g., the wireless capability of the communication module is disabled).

[0069] In some embodiments, the object monitoring system may operate in a hybrid communication mode, wherein one or more sensors communicate using a wireless communication protocol and at least one other sensor communicates via one or more cables, wherein both sets of sensors are active.

[0070] Suitable wireless communication protocols that may be used include Such as wireless local area network protocols according to the IEEE 802.11 standard, 2G, 3G or 4G telecommunication protocols, etc. Other formats will be readily apparent to those skilled in the art. A wireless communication protocol defines how many different channels a device can use to attempt wireless communication.

[0071] In some embodiments, when at least some of the wireless sensors are activated, each wireless sensor communicates with the communication module using a different channel. In other embodiments, when at least some of the wireless sensors are activated, a channel may be shared between more than one wireless sensor (e.g., if time division multiplexing is used, all sensors may share the same channel).

[0072] When at least some of the wireless sensors are activated, the communication module and the sensors may employ channel hopping techniques. Such techniques are known to those skilled in the art.

[0073] Figure 2 A method 20 for recommending a communication protocol according to a first embodiment of the present invention is illustrated.

[0074] The method 20 comprises a step 21 of determining a first noise value for each of a plurality of channels. Each channel is a frequency range over which a sensor and a communication module can communicate.

[0075] As previously mentioned, the size and frequency range of the channels may depend on the specific wireless protocol(s) that the sensor and communication module may use to communicate. Preferably, the multiple channels themselves form a continuous frequency range, i.e., the channels are adjacent to each other. As will be appreciated by those skilled in the art, the number, size, and configuration of the multiple channels depend on the specific wireless protocol(s) that the sensor and communication module are able to communicate. In particular, it will be appreciated that the width and range of each channel varies for different wireless protocols.

[0076] The first noise value obtained in step 21 is a measure of channel occupancy or noise. Preferably, the first noise value is a measure or parameter of radio signal information, such as a radio signal strength indicator (RSSI), which indicates whether the channel is occupied by another communication device (such as (another) MBAN). Other embodiments may use any measure of noise, such as the power level of the signal in the channel (e.g., in dBm).

[0077] Preferably, the first noise value is an average RSSI preferably obtained over a period of at least 30 minutes (such as at least one hour). In some embodiments, the average RSSI is further processed to determine a relative ratio or percentage to a maximum known or possible RSSI value (e.g., a historical maximum RSSI value). Thus, the first noise value may be an average percentage of RSSI relative to a maximum known RSSI level (such as obtained over a specific period of time (e.g., not less than 30 minutes)).

[0078] In other words, step 21 consists in obtaining data about each specific channel, wherein the data is indicative of a certain noise level or other value representative of the occupancy level of each channel.

[0079] The method 20 further comprises a step 22 of determining a number of qualified channels for wireless communication having a first noise value below a first predetermined threshold.

[0080] The first predetermined threshold may represent a noise level above which a signal between a sensor of the object monitoring system and a communication module within the channel is considered unreliable (e.g., may become indistinguishable from noise or other interference). Thus, step 22 actually comprises counting the number of channels with a sufficiently low noise level to achieve reliable wireless communication. In particular, the first predetermined threshold may define whether, on average, the channel is not occupied by another source and is therefore free to communicate with a high degree of reliability. In the case where the first noise value is an average RSSI, the first predetermined threshold may be no greater than -75 dBm, for example no greater than -85 dBm.

[0081] The method 20 further comprises a step 23 of recommending whether the wireless communication mode should be used based on the determined number of eligible channels. In this way, step 23 recommends whether the wireless communication mode should be used based on the number of channels that allow reliable wireless communication.

[0082] In the illustrated example, step 23 includes a sub-step 24 of determining whether the number of eligible channels is (or is not) greater than or equal to a first predetermined number.

[0083] In response to sub-step 24 determining that there are greater than or equal to the first predetermined number of qualified channels, sub-step 25 is performed. In response to sub-step 24 determining that there are less than the first predetermined number of qualified channels, sub-step 26 is performed. Sub-step 25 includes recommending the use of the wireless communication mode. Sub-step 26 includes recommending not using the wireless communication mode, for example, by recommending the use of the wired communication mode.

[0084] Therefore, step 23 includes recommending whether to use the wireless communication mode based on a comparison between the number of qualified channels and a predetermined number. In this way, the wireless communication mode is recommended only if a suitable number of qualified channels are available to ensure a reliable wireless connection between the at least one sensor and the communication module.

[0085] The first predetermined number may be, for example, 1. Thus, step 24 may include determining whether there are any qualified channels. In response to step 24 determining that there are at least one qualified channel, a sub-step 25 of recommending the use of a wireless communication mode is performed. In response to step 24 determining that there are not at least one qualified channel, a sub-step 26 of recommending not using a wireless communication mode (e.g., using a wired communication mode instead, if available) is performed. Setting the first predetermined number to a value of 1 simplifies the method because step 24 will only need to determine whether there are any qualified channels.

[0086] However, in other embodiments, the first predetermined number may be greater than 1. For example, some embodiments may desire that the communication module use more than one channel for communication. In one example, the first predetermined number is equal to the number of sensors to be used, so that each sensor can use a separate channel for communication. This will reduce inter-sensor interference. In another example, there may be regulatory requirements that specify a specific duty cycle for a given channel used for wireless communication, in which case more than one channel (e.g., two or three channels) may be required to enable a sensor or communication module to switch between more than one channel, thereby complying with (one or more) regulatory requirements while maintaining continuous wireless communication.

[0087] A first predetermined number greater than 1 will also increase the probability that the prediction that the wireless communication pattern will be reliable is correct in practice. This is because there will be a greater number of channels available for use or utilization by the communication module or sensor(s), for example, in the event that a channel used by the communication module or sensor(s) becomes noisy during wireless transmission due to undetected or new interference sources.

[0088] The step 23 of recommending whether to use the wireless communication mode may include presenting a clinician-perceivable output (i.e., a user notification) of the recommended mode. The output may be, for example, a message provided on a display (such as the display 13A of the patient monitor 13), an optical indicator such as a traffic light signal (e.g., green means the wireless communication mode is recommended, red means the wireless communication mode is not recommended), an acoustic signal, etc. The step of presenting a clinician-perceivable output may be integrated into sub-steps 25, 26. Additional examples of presenting a clinician-perceivable output are provided subsequently.

[0089] To explain further, Figure 3is an exemplary graph showing the measured RSSI of a plurality of different channels CH1-CF5. A first predetermined threshold value T1 is illustrated. The first CH1 and the fifth CF5 channels have RSSIs above the first predetermined threshold value T1. The second CF2, third CF3, and fourth CF4 channels have RSSIs below the first predetermined threshold value T1 and are therefore referred to as "qualified channels".

[0090] Figure 4 A method 40 for recommending whether to use a wireless communication mode according to a second embodiment of the present invention is illustrated.

[0091] The method 40 differs from the method 20 of the first embodiment in a different step 43 of recommending whether to use the wireless communication mode. Therefore, the method 40 further includes a step 21 of determining a first noise value for each of a plurality of channels and a step 22 of determining the number of qualified channels for wireless communication having a first noise value below a first predetermined threshold.

[0092] Step 43 of method 40 comprises a sub-step 44 of determining whether the number of eligible channels is greater than or equal to a second predetermined number. The second predetermined number may be different from the first predetermined number, and is preferably at least three.

[0093] In response to a positive determination in sub-step 44 (i.e., there are at least the second predetermined number of channels), sub-step 45 is performed. Sub-step 45 includes determining whether there are at least three adjacent qualified channels. Thus, sub-step 45 includes determining whether there is a sequence of at least three channels that are sequentially adjacent to each other. This effectively determines whether there is at least one qualified channel that is directly disposed between two other qualified channels (i.e., without an intervening channel).

[0094] In response to a positive determination in sub-step 45 (ie, when there are at least three adjacent channels), the method includes a sub-step 46 of recommending use of a wireless communication mode.

[0095] In response to a negative determination in sub-step 45, the method may include performing sub-step 49 (not shown in the figure) of recommending that the wireless communication mode not be used or sub-step 47 (as shown) of recommending that the wireless communication mode can be used but it may be unreliable or "problematic". Sub-step 47 may also include recommending that a wired communication mode may be used, if available (e.g., as an alternative to the wireless communication mode). Sub-step 49 may include recommending that a wired communication mode be used, if available.

[0096] Thus, the wireless communication mode is recommended for use only if there is a qualified channel (or multiple qualified channels) that is directly disposed between two other qualified channels. This increases the probability that the wireless communication mode will be reliable because qualified channels can be selected that have a reduced likelihood of signals in indiscernible adjacent channels "bleeding" into the selected channel(s) (e.g., due to variations in the power of signals in such channels or the use of different wireless communication protocols).

[0097] In response to a negative determination in sub-step 44, the method may perform sub-step 48 of determining whether there are at least a first predetermined number of qualified channels. In response to a positive determination in sub-step 48 (i.e., there are at least the first predetermined number), then sub-step 46 (the connection between sub-step 48 and sub-step 46 is not shown) or (preferably, and as shown) sub-step 47 is performed. If the first predetermined number represents a suitable number for ensuring that reliable wireless communication exists, then sub-step 46 may be performed. For example, when the first predetermined number is 1, sub-step 47 may be performed as a default state.

[0098] In response to a negative determination in sub-step 48 (ie, there are fewer than the first predetermined number of eligible channels), then the method performs sub-step 49 of recommending not using the wireless communication mode.

[0099] Alternatively, in response to a negative determination in sub-step 44, the method may proceed directly to sub-step 49 of recommending not using the wireless communication mode. Thus, sub-step 48 is optional.

[0100] Other embodiments of the present invention may also include, if the method performs the step of recommending the use of a wireless communication mode, recommending one or more specific channels to be used. For example, the step of recommending the wireless communication mode may include recommending the use of a qualified channel directly disposed between two other qualified channels to perform wireless communication between the sensor and the communication module (e.g., in method 40). As another example, the step of recommending the use of a wireless communication mode may include recommending the use of a qualified channel (or multiple channels) having the lowest first noise value to perform wireless communication between the sensor and the communication module.

[0101] It may be recommended to use more than one channel, for example for communicating with different sensors. Alternatively, more than one channel may be recommended to provide options for the clinician.

[0102] The method described above is particularly advantageous when used in a static environment. However, it should be recognized that the wireless signals in the environment may be more complex, for example due to short-term or periodically recurring radio activities with varying signal strengths. In particular, in a clinical environment such as a hospital, there may be a large number of different wireless systems in use, which may not have the same radio characteristics (e.g., different bandwidth occupancy, duty cycle, signal strength, etc.) and different distances from the object monitoring system in question. It can be assumed that the use of these systems will be randomly distributed, meaning that they will occupy channels for different time periods. Dynamic bandwidth occupancy means that at a first point in time, only a first group of channels will be eligible and available, and at a second different point in time, only a second different group of channels (e.g., fewer) will be eligible.

[0103] Therefore, in order to improve the reliability of predicting the reliability of the wireless channel (or multiple channels), long-term observation of the channels can be used. Therefore, each channel can be monitored for a period of not less than half an hour, such as not less than one hour, such as not less than 3 hours. Monitoring the channels can be performed continuously or by periodically sampling or evaluating the noise value of (one or more) channels.

[0104] In a particular embodiment, the method may further include determining a time occupancy value for each of the plurality of channels, the time occupancy value being the length of time that the second noise value for each of the channels is above a second predetermined threshold. In particular, the occupancy time value may be calculated over a particular time period (e.g., over the course of 30 minutes or over the course of an hour).

[0105] The occupancy time value may, for example, be the percentage of time that the second noise value is above the second predetermined threshold within a predetermined time period (ie, within a time period during which the communication module monitors the channel).

[0106] Figure 5 An embodiment is illustrated in which a first noise value 51 and a time occupancy value 52 are obtained for each channel CH1-CF5. Here, the first noise value represents the average percentage of RSSI relative to the maximum known RSSI level. The time occupancy value is the percentage of monitored time that the second noise value (e.g., the amplitude of RSSI) is above a second predetermined threshold.

[0107] The dashed symbol 51 represents a first noise value, and the arrow 52 represents an occupation time value. Using the first noise value 51 and the time occupation value 52, a long-term evaluation of the channel reliability is achieved.

[0108] When both values ​​51, 52 are above a respective predetermined threshold T (which may be the same for each value 51, 52 as shown), then the channel 55 (CH1, CH5) is completely unusable (ie, it is too noisy to allow reliable communication).

[0109] Low time occupancy values ​​(eg, below threshold T) and high average RSSI values ​​(eg, above threshold T) are indicators of an intermittent source of interference in channel 53 (CH2), such that the frequency may be considered unreliable for a period of time.

[0110] A high time occupancy value 52 and a low average RSSI value 51 are indicators that a permanent but distant interferer may be present in channel 54 (CH4). Although such channels may be suitable for reliable communications (due to low noise levels), they are less preferred than when both observed values ​​are low because the characteristics of the permanent interferer are more likely to change over time (e.g., due to the patient moving to different areas of the clinical environment).

[0111] When both observed values ​​are low (eg, below threshold T, as in channel 56 (CH3)), this indicates a qualified channel suitable for reliable and trouble-free operation of the wireless network because the channel appears to be unused in the immediate and distant vicinity.

[0112] Therefore, in some preferred embodiments, the step of determining the number of qualified channels for wireless communication may include determining the number of channels having a first noise value below a first predetermined threshold and a time occupancy value below a third predetermined threshold (the second predetermined threshold is used to calculate the time occupancy value).

[0113] The first and third predetermined thresholds may be the same, particularly in case the first noise value and the occupied time value are both percentages, fractions or otherwise on the same / similar scale.

[0114] Such an embodiment increases the likelihood that a channel identified as eligible will remain noise-free during operation of potential wireless communications between the sensor(s) and the communication module of the object monitoring system.

[0115] It has been previously described how embodiments of the present invention may also include, if a wireless communication mode is recommended for use, recommending one or more specific channels to be used. In one embodiment, the step of recommending a wireless communication mode may include recommending the use of a channel having a lowest first noise value 51 and / or a lowest occupied time value 52. In other examples, the step of recommending a wireless communication mode may include recommending the use of a channel having a lowest sum (e.g., if they are on the same scale) or a weighted sum (e.g., if they are not on the same scale) of at least the first noise value 51 and the lowest occupied time value 52.

[0116] It should be understood that using an average RSSI value for the first noise value (used in any described embodiment) is only one example of a possible first noise value. Many other suitable first noise values ​​can be envisioned, such as minimum RSSI, maximum RSSI, and / or average RSSI. The data obtained for characterizing the channel (e.g., the first noise value and the lowest time occupancy value or historical monitoring value used in calculating these values) should ideally be stored in a non-volatile memory to make the data available after a power outage.

[0117] It can be assumed that the communication modules are not usually mobile, so that the radio related conditions are reasonably constant over time.The combination of snapshot values ​​and historical data (eg occupancy time values) gives an accurate reliability prediction of the radio link.

[0118] The step of recommending whether to use the wireless communication mode may include generating a user-perceivable output (eg, an audio, visual, or tactile output). The user-perceivable output may indicate whether the wireless communication mode is recommended.

[0119] In some embodiments, there is a user-perceivable output (e.g., an alert) indicating that the wireless communication mode is not recommended (e.g., the wired communication mode is recommended instead), and there is no user-perceivable output (e.g., no alert) indicating that the wireless communication mode is recommended. Thus, under normal operating conditions, a reliability prediction may not be required, but in the event of abnormal, unforeseen conditions, the user will receive a warning before activating the wireless network. In this way, in the event of a warning, the user has sufficient time to activate an alternative connection method, such as the use of a sensor with a cable.

[0120] Preferably, the step of determining the first noise value (and optionally the second noise value) for each of the plurality of channels is performed only when the communication module is not in wireless communication with any sensor. This improves the reliability of wireless communication between the sensor and the communication module because any wireless transceiver does not divide its time between communicating patient parameters and monitoring channel data.

[0121] Of course, in some embodiments, determining the first noise value for each of the plurality of channels may be performed while the communication module is in wireless communication with the sensor, for example, if the communication module includes a dedicated receiver for monitoring the channels.

[0122] In other examples, a single receiver is adapted to monitor the channel and perform communications, such as by alternating between communications and monitoring of the channel using a time division system.

[0123] Figure 6 A communication module 60 for an object monitoring system according to an embodiment of the present invention is illustrated. The communication module 60 is designed to communicate with at least one sensor (not shown).

[0124] The communication module 60 includes a wireless transceiver 61 (or radio unit or base station) for sending and / or receiving wireless signals 61A to / from at least one sensor.

[0125] The communication module can operate in at least a wireless communication mode, wherein communication with at least one sensor occurs via wireless transceiver 61. The object monitoring system can also operate in a non-communication mode, wherein the object monitoring system cannot or is prohibited from attempting to wirelessly communicate with a sensor.

[0126] The communication module 60 may also include a wired modem 62 for sending and / or receiving wired signals 62A to / from at least one sensor. The wired modem is an optional feature of the communication module. In such an embodiment, the communication module may operate in a wired communication mode, wherein communication with at least one sensor is performed through the wired modem 62. If the communication module (and the sensor) operates in a wireless communication mode, the sensor does not need to be connected to the communication module via wires.

[0127] Of course, there can also be a hybrid communication mode, in which both the wireless transceiver and the wired modem are active, so that the communication with the sensors takes place both wirelessly and using wires. This can be used, for example, if each (wireless) sensor needs to use its own channel, but there are fewer eligible channels than sensors are needed for a specific purpose, e.g. due to permanent part-time interference of a TDMA system, there is not enough time on a single channel for all sensors.

[0128] The communication module may be adapted to switch between a wireless communication mode and at least one other mode (e.g., a wired or non-communication communication mode). Switching between communication modes may include appropriate activation and / or deactivation of the wireless transceiver 61 and / or the wired modem 62 (if present).

[0129] In some embodiments, when operating in wireless communication mode, the wired modem (if present) is disabled to save energy. In some embodiments, when operating in wired communication mode, the wireless transceiver is disabled to save energy, or used to monitor the channel (e.g., by performing the claimed method).

[0130] Depending on the communication mode of the communication module and / or sensor(s), the wireless signal 61A and / or the wired signal 62A may form a monitoring signal that provides the monitored patient parameter to the communication module.

[0131] The wireless transceiver 61 may be formed of one or more separate sub-transceivers (e.g., each sub-transceiver designed to communicate using a different wireless communication protocol and / or with a different sensor and / or a separate sub-transceiver designed to permanently monitor a channel and thus not communicate with a sensor).

[0132] The communication module 60 also includes a processing system 63, which is suitable for: determining a first noise value for each of a plurality of channels in which the at least one sensor and the communication module can communicate when operating in a wireless communication mode; and recommending whether to use the wireless communication mode based on the determined number of wireless communication channels.

[0133] In particular, the processing system 63 may be adapted to perform any of the previously described methods. Of course, the processing system 63 may also be adapted to select or deselect a recommended communication mode and control its operation so as to communicate with the sensor via the wireless transceiver 61 or optionally the wired modem 62 based on the selected communication mode, as will be apparent to the skilled person.

[0134] The processing system 63 may be adapted to communicate with a memory system 64, which is preferably formed of a non-volatile memory such as a flash memory. The memory system 64 may store calculated values ​​of the channels and / or historical information of the channels (such as historical noise values) for processing by the processing system.

[0135] The communication module 60 may further include a power supply 65 for providing power to other components of the communication module 60 , for example by converting a mains power supply.

[0136] Therefore, the communication module 60 may also include a user interface (not shown), such as a switch or button adapted to enable a user to switch the communication module between different power modes (e.g., on, off, standby, etc.). The processing system 63 may receive user input and switch the mode accordingly.

[0137] The user interface may also be adapted to enable the user to switch the communication module between different communication modes (eg, between wired and wireless communication modes). This may be performed by the user in response to one or more recommended communication modes.

[0138] In a preferred embodiment, the communication module 60 includes one or more battery chargers 66 adapted to connect to the sensor in order to charge the sensor. Thus, the sensor can be "docked" into the communication module 60 for charging.

[0139] In some preferred embodiments, the communication module is adapted to perform only the step of determining the first noise value (and optionally the second noise value) for each of the plurality of channels when the communication module is not in wireless communication with any sensor, such as when the sensor is docked (if such functionality exists) or the communication module is switched to a standby or non-communication mode. During this time, the processing system 63 may sequentially tune the wireless transceiver 61 to each known channel in order to measure the first noise value (and optionally the second noise value) for each channel. This measured information may be stored in the memory system 64 for later processing. This effectively establishes a representative image of the availability and use of each channel.

[0140] One limiting factor may be the availability of the wireless transceiver. In a specific example, if the wireless transceiver is idle (i.e., not used for communication with sensors), the wireless transceiver may only be able to obtain the first noise value for each channel. The wireless transceiver may be idle when all sensors belonging to the object monitoring system are docked for charging or the communication module is switched to standby. When the transceiver is active (i.e., communicating with sensors), the transceiver may switch between receive mode and transmit mode, making scanning and collection of (one or more) noise values ​​impossible or extremely slow.

[0141] In further embodiments, the communication module 60 may be adapted to use sensors that are docked to the communication module for charging (if such functionality exists) to speed up the scanning cycle. Since sensors typically have radio units comparable to (or at least compatible with) the wireless transceiver 61 used in the communication module 60, the sensors docked for charging may be used to collect channel data. Depending on the number of transducers docked, parallel scanning using multiple transducers significantly speeds up the scanning cycle.

[0142] In other words, the method of determining a first noise value for each of a plurality of channels may include using one or more sensors of the object monitoring system to perform the determination of the first noise value. This may significantly increase the speed at which data for each channel is obtained.

[0143] Of course, reference to a "first noise value" in the description of a communication module may be extended to refer to any information about a channel obtained by the communication module performing the claimed method, such as a second noise value. Thus, for example, a docked sensor may be used to obtain a first and / or second noise value for each channel.

[0144] The wired modem 62 may be further adapted to communicate with a patient monitor (not shown). The processing system 63 of the communication module may receive signals 61A, 62A containing monitored patient parameters from the sensors (via the wireless transceiver 61 or the wired modem 62, depending on the communication mode), and transmit signals 62B containing monitored patient parameters to the patient monitor via the wired modem (e.g., for storage and / or display).

[0145] In other embodiments, the communication module 60 is integrated into the patient monitor so that the processing system need not pass the signals received from the sensors. Alternatively, the processing system itself may process the signals received from the sensors, for example for storage and / or display.

[0146] In some embodiments, the communication module 60 includes a display 67 or other user output (such as a speaker or tactile output) for indicating the recommended communication mode to the subject. In other embodiments, the communication module can communicate the recommended communication mode to a patient monitor (not shown), which can provide a user output to the user (e.g., via a display of the patient monitor). Other methods of alerting a subject to a recommended communication mode will be apparent to those skilled in the art.

[0147] Embodiments of the present invention extend to an object monitoring system for monitoring an object including a communication module and one or more sensors as described herein capable of communicating with the communication module in both wired and wireless communication modes. In a preferred embodiment, the communication module is adapted to charge the one or more sensors (e.g., using a docking portion), and the one or more sensors are correspondingly adapted to be charged by the communication module (e.g., adapted to be docked into a docking portion of the communication module). The object monitoring system may include one or more cables for connecting the corresponding one or more sensors to the communication module to achieve wired communication in accordance with a recommended communication mode.

[0148] A skilled person will be able to easily develop a processing system for performing any of the methods described herein. Thus, each step of the flowchart may represent a different action performed by a processing system and may be performed by a corresponding module of the processing system. The processing system may be integrated into a communication module of an object monitoring system.

[0149] Thus, embodiments may utilize a processing system. The processing system can be implemented in a variety of ways using software and / or hardware to perform the various functions required. A processor is an example of a processing system that employs one or more microprocessors that can be programmed using software to perform the desired functions. However, a processing system may be implemented with or without a processor, and may also be implemented as a combination of dedicated hardware that performs some functions and a processor (e.g., one or more programmed microprocessors and associated circuits) that performs other functions.

[0150] Examples of processing system components that may be employed in various embodiments of the present disclosure include, but are not limited to, conventional microprocessors, application specific integrated circuits (ASICs), and field programmable gate arrays (FPGAs).

[0151] In various embodiments, a processor or processing system may be associated with one or more storage media, such as volatile and non-volatile computer memory, such as RAM, PROM, EPROM, and EEPROM. The storage media may be encoded with one or more programs that, when run on one or more processors and / or processing systems, perform the desired functions. The various storage media may be fixed within the processor or processing system, or may be transferable so that one or more programs stored thereon may be loaded into the processor or processing system.

[0152] It should be understood that the disclosed method is preferably a computer-implemented method. Therefore, the concept of a computer program is also proposed, and the computer program includes a code device for implementing any described method when the program is running on a processing system (such as a computer). Therefore, the different parts, rows or blocks of the code of the computer program according to an embodiment can be executed by a processing system or a computer to perform any method described herein. In some alternative implementations, the function of annotation in the box may not occur in the order annotated in the figure. For example, two boxes shown in succession can actually be performed substantially simultaneously, or boxes can sometimes be performed in reverse order, depending on the function involved.

[0153] Embodiments of the present invention have been described with reference to channels. A channel is a range of frequencies present within a frequency band defined by the wireless protocol in use, e.g. Typically 16 channels are defined. In some embodiments, a channel may include one or more sub-channels (e.g., each sub-channel covers a different frequency sub-range within the channel). In some embodiments, each sub-channel may be used by a sensor to communicate with an object monitoring signal. Thus, noise values ​​for multiple sub-channels may be obtained simultaneously. In an embodiment, each channel may be represented by a (predetermined) frequency range, which may depend on the wireless protocol in use.

[0154] Those skilled in the art can understand and implement variations of the disclosed embodiments when practicing the claimed invention by studying the drawings, the disclosure and the claims. In the claims, the word "comprising" does not exclude other elements or steps, and the words "one" or "an" do not exclude multiple. A single processor or other unit can implement the functions of several items recorded in the claims. Although specific measures are recorded in mutually different dependent claims, this does not indicate that the combination of these measures cannot be used advantageously. If a computer program is discussed above, it can be stored / distributed on a suitable medium, such as an optical storage medium or solid-state medium supplied together with other hardware or as part of other hardware, but it can also be distributed in other forms, such as via the Internet or other wired or wireless telecommunications systems. If the term "suitable for" is used in the claims or description, it should be noted that the term "suitable for" is intended to be equivalent to the term "configured to". The terms "patient" and "object" have been used interchangeably throughout this document. Any figure mark in the claims should not be interpreted as limiting the scope.

Claims

1. A method (20, 40) for recommending whether an object monitoring system should use a wireless communication mode to communicate data between at least one sensor (11A, 11B) and a communication module (12) of the object monitoring system, the method comprising: determining (21) at the communication module a first noise value for each of a plurality of channels (CH1, CH2, CH3, CH4, CH5) in which the at least one sensor and the communication module are able to communicate when the object monitoring system is operating in a wireless communication mode, the first noise value being a measure of channel occupancy or noise; determining (22) a number of qualified channels for wireless communication having said first noise value below a first predetermined threshold (T1); and A recommendation (23, 43) is made based on the determined number of eligible channels whether a wireless communication mode should be used.

2. The method according to claim 1, wherein: The first noise value includes a received signal strength indicator RSSI value.

3. The method according to claim 2, wherein: The first noise value includes an average RSSI value.

4. The method according to any one of claims 1 to 3, wherein: The step (23) of recommending whether the wireless communication mode should be used comprises: If the number of eligible channels is below a first predetermined number, recommending (26) not using the wireless communication mode; and If the number of eligible channels is higher than or equal to the first predetermined number, it is recommended (25) to use a wireless communication mode.

5. The method according to any one of claims 1 to 3, wherein: The step (43) of recommending whether the wireless communication mode should be used comprises: In response to the number of qualified channels being greater than a second predetermined number: Determining (45) whether there are at least three adjacent qualified channels; In response to determining that there are at least three adjacent eligible channels, recommending (46) use of a wireless communication mode; and In response to determining that there are not at least three adjacent qualified channels: Recommendation (47) Wireless communication modes can be used, but may be unreliable; or It is recommended (49) not to use wireless communication mode.

6. The method according to claim 5, wherein: The step (43) of recommending whether the wireless communication mode should be used comprises: In response to the number of qualified channels being equal to or less than the second predetermined number: If the number of eligible channels is below a first predetermined number, recommending (49) not using the wireless communication mode; and If the number of eligible channels is higher than or equal to the first predetermined number, it is recommended (47) that the wireless communication mode can be used, but may be unreliable.

7. The method according to claim 5, wherein: The step of recommending use of a wireless communication mode in response to determining that there are at least three adjacent qualified channels comprises: It is recommended (46) to use a wireless communication mode in which wireless communication is performed on a qualified channel that is directly arranged between two other qualified channels.

8. The method according to claim 1, further comprising determining, at the communication module, a time occupancy value (52) for each of the plurality of channels (CH1, CH2, CH3, CH4, CH5), the time occupancy value being a length of time that a second noise value of the corresponding channel is above a second predetermined threshold, in, The step of determining the number of qualified channels for wireless communication includes determining the number of qualified channels having the first noise value below the first predetermined threshold and the time occupancy value below a third predetermined threshold, wherein the first noise value is an average received signal strength indicator RSSI value and the second noise value is a received signal strength indicator RSSI value.

9. The method according to any one of claims 1 to 3, wherein: The step of determining, at the communication module, a first noise value for each of a plurality of channels is performed only when the communication module is not in wireless communication with the at least one sensor.

10. The method according to claim 2, wherein: The first noise value comprises an average RSSI value obtained over a period of at least 30 minutes.

11. A method of selecting a communication mode to be used by an object monitoring system for communicating between at least one sensor and a communication module, the method comprising: recommending whether a wireless communication mode should be used by performing the method according to any one of claims 1 to 10; and If the wireless communication mode is recommended, the wireless communication mode is selected.

12. A computer-readable medium storing a computer program, the computer program comprising code means for implementing the method according to any one of claims 1 to 11 when the program is run on a processing system.

13. A communication module (12, 60) for an object monitoring system, the communication module being operable to communicate with at least one sensor when the object monitoring system is operating in a wireless communication mode, the communication module comprising a processing system (63) adapted to: determining (21) a first noise value for each of a plurality of channels in which the at least one sensor and the communication module are capable of communicating when operating in a wireless communication mode; determining (22) the number of wireless communication channels having said first noise value below a predetermined threshold, said first noise value being a measure of channel occupancy or noise; and Based on the determined number of wireless communication channels, a recommendation (23, 43) is made as to whether the object monitoring system uses a wireless communication mode.

14. The communication module according to claim 13, wherein: The processing system is adapted to determine the first noise value for each of the plurality of channels only when the communication module is not in wireless communication with the at least one sensor.

15. An object monitoring system comprising: The communication module (12, 60) according to any one of claims 13 or 14; as well as One or more sensors (11A, 11B) for monitoring an object, the one or more sensors being capable of wirelessly communicating with the communication module when the object monitoring system operates in a wireless communication mode.

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