METHOD FOR CONTROLLING A SYSTEM OF RADIO COMMUNICATIONS EQUIPMENT AND RELATED RADIO COMMUNICATIONS EQUIPMENT

Description

Description of the patent for industrial invention from title: “METHOD FOR CONTROLLING A SYSTEM OF DEVICES RADIO COMMUNICATION AND RELATED COMMUNICATION EQUIPMENT RADIO" on behalf of Massimiliano BISCEGLIA, of Italian nationality Inventors: Massimiliano BISCEGLIA, Antonio CANTAGALLO 10 ****** The present invention relates to a method for the control of a system of radio communications equipment. More specifically, the invention concerns a method for the control of a system comprising multiple devices 15 radio communication. Each apparatus comprises at least one radio transmitter and associated radio receivers said transmitter. The present invention relates in particular to the radio guide equipment sector. In the sector of 20 tourism, but not only, are particularly widespread devices radios that allow the real-time transmission of a audio signal from a transmitter to a plurality of receivers. These devices allow a subject, defined as 25 speaker, such as a guide, to speak to a certain number of listeners (tourists, visitors, etc.) by means of a radio transmitter to which a microphone is connected. listeners, in turn, can hear the voice of the speaker through a radio receiver to which it is 5 Connected a headset speaker or headphones. Typically, transmitters used in radio equipment radio guides are configured to transmit the signal audio on a limited number of channels, each corresponding to a specific frequency or band 10 frequency. With such devices there is no limit to the number of receiving devices that can receive the signal audio transmitted by a transmitter. This means that any receiving device tuned to the channel 15 where the transmitter transmits and which is located at a “reach” distance, has the ability to reproduce the transmitted audio stream. For this to happen, however, it is It is necessary that the transmitter and receivers use the same transmission protocol. 20 Due to the huge number of devices in radio frequency which are used for the most common purposes disparate, to allow their coexistence, or ensure its operation without any disturbances mutual, there are both regional and local regulations 25 national and international, which regulate the occupation of radio channels. The radio guide devices are catalogued in the sector of “radio microphones”, which can only work in certain frequency bands or values, e.g. Sub 5 Ghz (877 Mhz, 977 Mhz, etc.) or in Up Ghz, for example 2.4 Ghz. With particular reference to the aforementioned frequency bands tuned to the "radio microphones", even though they are already implemented protocols to limit disturbances between 10 more transmitters using the same band frequency, in reality it often happens that the signal of the more powerful transmitter causes interference compared to the signals sent by other transmitters less powerful. 15 In contexts where there are several transmitters operating simultaneously on a limited number of bands of frequency, that is, of channels, as happens near very crowded tourist sites (buildings, monuments, museums, art galleries, etc.), the problem of interference and 20 of the disorders are particularly felt. At the state of the art, a palliative solution currently used is to carry out, before start broadcasting, a manual channel search free (among those available), that is, where they are not already 25 transmitting other transmitters physically close to or with higher power signals, which could generate interference in the signal received by the receivers. In such contexts, however, it is normal for the guide, who carries the transmitter, and the listeners, who carry the 5 receiver, continuously move in the area to be visit. Therefore, when a transmitter (or more than one) is set to transmit on a certain channel (or frequency or frequency band) approaches associated receivers 10 to another transmitter and set to receive on same channel, it can generate noise and interference. In these cases it is therefore necessary that at least one of the two transmitters, and their associated receivers, change their transmission / reception channel. 15 This method is clearly inconvenient taking into account that, every time the guide changes channels of the transmitter, it is also necessary to reset all the listeners' receiving devices to be able to receive on the new channel. 20 This operation, as is understandable, is even more uncomfortable if it has to be repeated several times during a visit. In this context, it is the purpose of the present invention propose a method for the control of a system of 25 radio communication devices, in particular devices for radio guidance, which overcomes the drawbacks of the technique note cited above. It is therefore the purpose of the present invention to propose a method for controlling a system of equipment 5 radio communication comprising at least one transmitter radio and radio receivers, which method allows various radio receivers associated with a specific transmitter to receive an audio signal without interference. 10 Another object of the present invention is to provide provision of a method that allows for control fully automatic communication devices radio, without requiring interventions on the transmitters and on the receivers. 15 In particular, it is the purpose of the present invention to provide a method that allows transmitters and receivers to automatically change the respective transmission and reception channel for keep communication as free from interference as possible 20 disorders. The purpose of the present invention is also to propose a radio communication device, to be used in a system of radio equipment, which exceeds the drawbacks of the prior art mentioned above. 25 These and other purposes are achieved by a method for control a system of radio communications equipment in accordance with the attached claim 1. In detail, the method according to the present invention allows you to control a system of devices 5 radio communication where each apparatus comprises at least a radio frequency TX transmitter and receivers radio frequency RX radio. The radio transmitter TX comprises at least one analog / digital converter, an antenna assembly, and a 10 control units connected to said converter analog / digital and said antenna group. The RX radio receiver includes at least one converter digital / analog, an antenna assembly, and a control unit control connected to the digital / analog converter and to the 15 antenna group. The radio transmitter TX is configured to transmit on a certain number N of channels CH.n, where each channel CH.n corresponds to a certain frequency or, more typically, at one frequency band. 20 The TX transmitter is usually associated with a microphone to pick up a speaker's voice. Said microphone can be connected to the TX transmitter in mobile way or can be integrated into the latter. The RX receiver is typically associated with a source 25 sound reproduction such as headphones, a headset, a speaker, etc. This source of sound reproduction can be connected to the RX transmitter in mobile mode or can be integrated into the latter. 5 The conversion of the analog signal (captured by the microphone) into a digital signal, into the radio transmitter TX, and the reconversion of the digital signal into a analog (sent to the sound reproduction source), in the RX radio receiver, it occurs according to protocols for 10 sending data in standard or industry-known packets. Each radio transmitter, moreover, is associated with a own unique identifier UID. This identifier unique can be included in the transmitted digital signals from the radio transmitter TX, for example as a payload in 15 each data packet sent. According to the present invention, the method comprises a automatic selection phase of the transmission channel CH.n for each radio transmitter in the system. More specifically, the aforementioned channel selection phase 20 transmission includes the following sub-phases. When the TX radio transmitter is turned on, the method plans to perform a radio frequency scan (e.g. through a sweeping process) to capture the signals emitted by other active radio transmitters of the 25 system within a certain range. This scanning is performed on each of the N channels CH.n (i.e. across the entire frequency band usable by the system) and the captured signals are processed by the unit control of each radio transmitter TX. 5 Once a cycle of this scan is completed, the method involves generating, via the control unit of the radio transmitter, a classification of the signals transmitted by other radio transmitters active on each of the N channels CH.n, if present. 10 More specifically, this ranking is generated in function of: - a Receive Signal Strength Indicator (RSSI) value of the signal of each radio transmitter TX; and, preferably, 15 - a credibility score of C of the above value RSSI of each radio transmitter TX signal. Finally, the method involves selecting the channel as the transmission, among the N available CH.n channels, one channel CH.n where there are no other detectable signals, i.e. where 20 the channel is free, or, in the case where on all N channels where signals are picked up, the one where the level of RSSI of other signals is the lowest. According to a preferred variant in which it is provided the calculation of the credibility score C of the values ​​of 25 RSSI of the captured signals, the choice of the channel transmission is carried out on the basis of an algorithm in the which both of the above factors are considered, as will be described below. The above mentioned classification typically includes, for example, 5 for each signal captured, a score calculated as a function of the two parameters mentioned above. The scanning of the signals on the N channels CH.n is repeated cyclically, with a certain time interval t1 (for example example 20 ms), so that the said ranking is updated 10 continuously at each time interval. In the attached figure 1 it is represented in a manner schematic example of choosing the transmission channel for a TX transmitter in a context where there are other F five transmitters TX , TX , TX , TX , TX that are ABCDE 15 transmitting respectively on the physical channels CH.01, CH.07, CH.09 and CH.10. The control unit of the radio transmitter TX F scans the signals that can be detected on the various channels (ten in the example illustrated) and, for each channel where it is 20 detected a signal (CH.01, CH.07, CH0.9 and CH.10), it measures the RSSI value, as shown in the table of figure 1. The transmitter control unit then selects as a transmission channel a free physical channel, for example 25 example the first free considering the numbering growing. In the example in Figure 1, for the radio transmitter TX will select CH.02 channel as the transmission channel F transmission. 5 As you can see in the example shown on the channel physical CH01 can transmit two simultaneously radio transmitters TX and TX since they can be detected by AB respective different unique identifiers UID. A RX radio receiver could then receive on its own 10 channel receive more signals (packets), but will perform demodulation of signals containing only the unique identifier UID to which it is associated. If the TX transmitter is far enough away from the TO receivers associated with the TX transmitter and vice versa, the B 15 respective signals can share the channel without generate mutual disturbances. According to the present invention, the method comprises also a pairing phase of a radio transmitter TX, with a specific unique identifier UID, with some 20 RX radio receivers. According to one aspect of the invention, said phase of Mating may involve the following sub-phases: a) transmit with the TX transmitter on all N CH.n channels a signal containing information 25 relating to the unique identifier UID, to the channel of CH.n transmission identified in the previous phase; b) configure one or more RX radio receivers so that said one or more radio receivers RX can or can receive on the said selected channel CH.n. 5 More in detail, according to a preferred way of implementation, the method involves: - analyze, via the control unit of the RX receiver, the signals that can be picked up to detect the presence of information relating to a 10 unique identifier UID, and a channel of CH.n transmission; - measure the RSSI value of said signals which contain information relating to a unique identifier UID and a channel of 15 CH.n transmission; and - if the RSSI value of a signal is above a given threshold value S, store the unique identifier UID contained in said signal as a unique identifier UID to which 20 pair the RX receiver. This mating phase is usually performed keeping the TX transmitter and RX receivers close together that you want to associate, so that the signal emitted by the the TX transmitter in question is picked up by the receivers 25 with a very high RSSI level (higher than the value of pre-established threshold S), which tends to be higher than all other possible other signals of others transmitters in range. The attached figure 2 illustrates in a manner 5 schematic of a device with a radio transmitter TX the TO which is placed in a pairing mode Mode) in which it sends a packet on all N channels P “PAIRING” with its unique UID and the chosen channel. TO RX radio receivers that are in range and receiving the 10 P packet with an RSSI signal level above a certain threshold stores the UID information as TO identifier of the radio transmitter RX of which they will have to demodulate the audio packets. Assuming the RSSI threshold is -35dB, if a 15 given radio receiver RX receives a packet P, it will consider, by storing the specific UID, whether the value of RSSI will be less than -35dB. In the case shown, the TX transmitter sends a TO P packet with UID and receivers RX, RX and RX (having A 1 2 3 20 received the P packet with a signal level above the threshold) store the UID as the identifier of the TO own transmitter and the channel where the transmission is will send audio packets. The radio receivers RX and RX , 4 5 having received the P packet with a signal level 25 much lower than the threshold, they do not consider it to be theirs addressed and discard it while keeping their UID already memorized. According to one aspect of the invention, radio receivers RX when not in use, can be kept in a 5 stand-by condition (“sleep mode”) in which, cyclically, they activate for a few milliseconds (for example example 10 milliseconds every second) to capture signals of remote-range TX radio transmitters. Thanks to the method of the present invention it is possible 10 control a plurality of communication devices radio, such as radio guides or similar, in such a way that the signal transmission from a radio transmitter TX to of the associated RX radio receivers, is free from interference due to signals from other devices transmitting in the 15 neighborhoods on the same radio channel, or however it is in in a completely negligible manner. In particular, thanks to the analysis of the signals that can be captured in the same area and on the various available channels, the radio transmitter is able to automatically select 20 the best channel, that is a free channel where there are no signals that can be picked up, or, in any case, a channel where the others signals from other transmitters have a low value of RSSI, and therefore are less disturbing. The adoption of the additional parameter linked to the 25 credibility of the calculated RSSI values, also allows to avoid transmission channel selection errors due to transitory conditions (increasing or decreasing decrease) in the intensity of the signals of others radio transmitters. 5 For example, a first radio transmitter TX, detecting on a CH.n channel a modest RSSI value of one second radio transmitter TX (so theoretically not disturbing), may select said channel CH.n as optimal transmission channel. After a few moments, said 10 second radio transmitter TX could instead start to engage the CH.n channel with a high-frequency signal intensity (high RSSI). This condition may occur, for example, when a said second radio transmitter TX is located at a 15 “reaching” distance, but, for a few moments, at the moment of the signal detection by the first TX radio transmitter, remained partially shielded (for example it was behind a metal door or a particularly thick wall) and then return to 20 transmit without obstacles after a short while, thus making to detect a very high RSSI value from other transmitters higher. According to a preferred aspect of the invention, the credibility score C is then calculated as a function 25 of the variation of said RSSI value after a certain number of channel scan cycles. More precisely, the so-called credibility score C is calculated as a function of time (number of cycles of detection) during which the RSSI value detected 5 for a given radio transmitter TX-ID remains within a preset interval, relative to the RSSI value detected in the previous detection cycle (t-1). More in detail, according to a possible way of implementation, this score can be increased, for example 10 example of a unit, whenever the RSSI value of a given transmitter TX-ID, at the next cycle, remains within a certain range. Similarly, this credibility score C can decrease when RSSI value detected at one cycle 15 next is outside of that range. Preferably the incremental units at each cycle are of lower value than the decremental ones. So, if for a given radio transmitter TX is detected a low RSSI value at time t (the ranking 20 current) while this value was high in the ranking at time t-1 (i.e. the previous ranking), It could mean that the low value at time t is only transient. On the contrary, if this RSSI value remains roughly constant (e.g. low) for a 25 increasing number of cycles, also the score of credibility C will gradually increase. Figure 3 shows an example of the choice of transmission channel of a TX transmitter which must Z, select your broadcast channel from ten 5 channels available CH.01-CH.10. From the scan performed by the radio transmitter TX, Z Signals from other sources are picked up on all channels transmitters, i.e. there are no free channels. The unit TX transmitter control will therefore implement Z 10 the method described above considering both the level of RSSI of the other signals, both the respective score of credibility C. According to a preferred variant, the ranking of the signals from other transmitters is obtained by calculating 15 for each signal a score given by the product of the absolute value of RSSI for credibility score C. In the example in Figure 3, the channel where the respective signal has the highest score is the channel CH.09 where this score is equal to 23,051 (i.e., |-89| x 259). The 20 radio transmitter TX will then choose this channel CH.09 Z as a transmission channel. According to another aspect of the present invention, the method involves a radio transmitter TX of the system automatically change the broadcast channel when on 25 a channel CH.n, on which at least two are transmitting radio transmitters, a condition occurs possible interference or disturbance. More in detail, when on the same channel CH.n are transmitting two or more radio transmitters TX whose 5 respective RSSI values ​​are higher than a value of preset threshold, the control units of said TX radio transmitters are configured to operate a change channel, for example according to one of the logics described below. 10 According to a first implementation method, it is foreseen that both the radio transmitter TX whose unique identifier UID (numeric or alphanumeric) is less than changing the transmission channel. According to a second way of implementation, it is instead 15 expected to be the TX transmitter whose identifier unique UID (numeric or alphanumeric) is greater than change the broadcast channel. According to other alternative ways of realization, it is It is possible to set the priority of channel change between two 20 TX radio transmitters based on their rating credibility C. This solution allows to standardize the probability of encountering a channel change request for all TX radio transmitters of the system, compared to the two ways of realization described above, in 25 such as TX radio transmitters with an identifier unique low value are statistically more likely to be affected to the request to change channel compared to those with a unique identifier of high value or vice versa. Therefore, according to this variant, in a third way of 5 realization, it is expected that the radio transmitter TX whose RSSI value credibility degree is lower to change the transmission channel. In a fourth way of implementation, it is instead foreseen that it is the radio transmitter TX whose degree of 10 RSSI value credibility is superior to changing the transmission channel. More specifically, according to the third and fourth ways of realization, the method provides that, when on the same channel CH.n two or more transmitters are transmitting 15 TX radios whose respective RSSI values ​​are higher than preset threshold value, both or all transmitters (TX) send a signal containing a credibility score information C of the other transmitter(s) involved. 20 In this way, each TX transmitter can receive information about your score C credibility detected by other radio transmitters TX (depending on the relative positions, a transmitter radio TX typically has a credibility score 25 C different for each other transmitter in the system) so that the respective control units can perform the comparison of values. These control logics are used to carry out the change of transmission channel only to one of the two 5 TX radio transmitters in question. In fact, if both if they change channels at the same time, it could happen that the respective control units select the same new transmission channel, thus triggering a new “channel change trigger” condition. 10 According to the invention, the method for changing the channel transmission is the same as that implemented for the first choice of the transmission channel when the transmitter starts, and described above. According to another aspect of the invention, when a 15 radio transmitter TX has selected a new channel transmission on which to transmit, the method involves perform an automatic change of the respective channel reception of all associated RX radio receivers. More specifically, according to the present invention, the 20 method provides that, once a new channel has been identified of transmission on which to transmit, the radio transmitter TX sends on the current transmission channel CH.n (i.e. (the one already in use) a signal containing information relating to your unique identifier (UID) and the new 25 broadcast channel selected. The RX radio receivers, which receive the above signal, via their control unit, they change the channel receiving from channel CH.n (in use) to the new channel communicated by the TX transmitter. 5 At this point, the TX transmitter starts to broadcast on the new channel. According to another aspect of the present invention, in the case where a radio receiver RX does not receive any expected signals (i.e. data packets containing 10 the unique identifier UID of the radio transmitter TX associated) for a given time interval t3, the method involves: - perform a scan with the RX radio receiver of all N channels available until on 15 one of said channels receives a signal comprising called a unique identifier UID (i.e. a payload corresponding to the unique identifier of the transmitter) to which the radio receiver is associated RX; and 20 - configure said radio receiver RX so that said radio receiver RX receives on the channel where it was received the said signal including the identifier Expected unique UID. The operation of analyzing the signals detected during the 25 scanning and setting the new receiving channel is operated by the RX radio receiver control unit. This operation of scanning all channels (called (in jargon rollover channel) is performed both in the case in which the receiver “loses” the packets containing 5 the information relating to the channel change, both when said receiver is temporarily in a non-functional condition receive more signals from the transmitter (for example there is a obstacle screens between them). The purposes of the present invention mentioned above are 10 also reached with a radio communication device, to employ a system of communication devices, in agreement with the attached claim 11. In detail, the radio communication apparatus includes at least one radio frequency TX radio transmitter 15 and radio frequency RX radio receivers. The radio transmitter TX comprises at least one analog / digital converter, an antenna assembly, and a control unit connected to said converter analog / digital and said antenna group. 20 The radio receiver RX includes at least one converter digital / analog, an antenna assembly, and a control unit control connected to the digital / analog converter and to the antenna group. Typically the radio transmitter and receiver 25 radios, being portable type, also include a drums. The radio transmitter TX is configured to transmit on a certain number N of channels CH.n, where each channel corresponds to a certain frequency or band of 5 frequency. The transmitter is also associated with its own unique identifier UID. This unique identifier can be included in the digital signals transmitted by the transmitter, for example as a payload in each packet 10 data sent. According to the present invention, the control unit of the radio transmitter is configured to perform a automatic selection of the transmission channel. In more detail, the control unit is configured 15 to perform, when the TX radio transmitter is turned on, a scan to pick up signals emitted by others radio transmitters already active in the system and which are located within a certain range. Scanning is performed on each of the N channels CH.n. The signals 20 captured being processed by the control unit for generate a ranking of the signals transmitted by others TX radio transmitters on each channel based on: a) an RSSI value of each signal TX radio transmitter; and, preferably, 25 b) a credibility score C of the above value RSSI of each radio transmitter TX signal. The control unit of the radio transmitter TX is also configured to select as the channel of transmission, among the N available CH.n channels, one channel 5 CH.n where there are no other detectable signals, i.e. where the channel is free, or, in the case where on all N channels where signals are picked up, the one where the level of RSSI of other signals is the lowest. According to a preferred variant, the control unit is 10 configured to calculate a credibility score C of the RSSI values ​​of the captured signals. The control unit is also configured to implement an algorithm for channel selection transmission, where said algorithm includes the above mentioned 15 factors, i.e. RSSI value and credibility score C. The scan is repeated cyclically, typically with a predetermined time interval t1, so that it dictates the ranking is continuously updated at each interval storm. 20 According to the present invention, the apparatus is configured to pair a radio transmitter TX with a specific unique identifier UID with one or more radio receivers RX. According to one aspect of the invention, the control unit 25 of the TX radio transmitter is configured for: a) transmit with the TX transmitter on all N CH.n channels a signal containing information relating to the unique identifier UID and the channel of CH.n transmission identified in the phase 5 previous; and b) configure one or more RX radio receivers so that said one or more radio receivers RX can or can receive on the said identified channel (CH.n). More in detail, according to a preferred way of 10 implementation, the RX receiver control unit is configured for: - analyze the detectable signals to detect the presence of information relating to a unique identifier UID, and a channel of 15 CH.n transmission; - measure the RSSI value of said signals which contain information relating to a unique identifier UID and a channel of CH.n transmission; and 20 - if the RSSI value of a signal is above a certain threshold, store the unique identifier UID contained in the said signal as an identifier unique UID to associate the RX receiver with. Additional features of the apparatus 25 radio communication of the present invention have been described above with reference to the method used by the said apparatus. The present invention, as described and illustrated, it is however subject to changes and variations 5 to be understood as included within the scope of the inventive concept; furthermore, all details can be replaced by other technically equivalent elements.

Claims

1. A method of controlling a system of radio communication apparatus, wherein each radio communication apparatus comprises at least one radio frequency radio transmitter (TX) and radio frequency radio receivers (RX), wherein the radio transmitter (TX) comprises at least one analog / digital converter, an antenna assembly, and a control unit connected to said analog / digital converter and to said antenna assembly, wherein the radio receiver (RX) comprises at least one digital / analog converter, an antenna assembly, and a control unit connected to the digital / analog converter and to the antenna assembly, wherein the radio transmitter (TX) is configured to transmit on a number N of channels (CH.n), each channel comprising a given frequency or frequency band, in which each radio transmitter (TX) is associated with a unique identifier (UID) included in the transmitted signals, the method comprising a phase of automatic selection of the transmission channel for each radio transmitter (TX) of the system, said phase of selection of the transmission channel comprising the following sub-phases: a) performing a scan to capture the signals emitted by all the radio transmitters already active of the system within a given range, said scan being carried out on each of the N channels (CH.n) and said captured signals being processed by the control unit of each radio transmitter (TX); b) generate a ranking of the signals transmitted by the other radio transmitters (TX) of the system on each of the N channels on the basis of: an RSSI value of the captureable signals transmitted by the other radio transmitters (TX) of the system and, preferably, a credibility score (C) assigned to each RSSI value of the captured signals; and c) select as the transmission channel, among the N available channels, a channel (CH.n) where there are no other captureable signals, i.e. where the channel is free, or, in the case in which signals are captured on all N channels, the one where the RSSI level of the other signals is the lowest.

2. The method according to claim 1, further comprising a pairing step of a radio transmitter (TX), with a given unique identifier (UID), with one or more radio receivers (RX), where said pairing step comprises the following sub-steps: a) transmitting with the transmitter (TX) on all N channels (CH.n) a signal containing information relating to its unique identifier (UID) and the selected transmission channel (CH.n); and b) configuring one or more radio receivers (RX) so that said one or more radio receivers RX can or can receive on said selected channel (CH.n).

3. The method according to claim 1 or 2 wherein, where the calculation of the credibility score (C) of the RSSI values ​​of other captured signals is provided, the choice of the transmission channel is made on the basis of an algorithm which includes both said RSSI values ​​and the respective credibility scores (C).

4. The method according to claim 3, wherein for each signal captured on each channel a score is calculated given by the product of the absolute value of the RSSI value by the credibility score (C).

5. The method according to any of the preceding claims, wherein the credibility score (C) of the RSSI values ​​of the signals captured by other radio transmitters (TX) is calculated as a function of the variation of said RSSI values ​​at each scanning cycle of each channel.

6. The method according to any of the preceding claims, which comprises a step of automatically changing the transmission channel of at least one radio transmitter (TX) of the system when, on the same channel (CH.n), at least two radio transmitters (TX) are transmitting whose respective RSSI values ​​of the signal are higher than a pre-established threshold value.

7. The method according to claim 6, wherein the change of transmission channel is implemented according to one of the logics described below: it is the radio transmitter (TX) whose unique identifier (UID) is lower that changes the transmission channel; it is the transmitter (TX) whose unique identifier (UID) is higher that changes the transmission channel.

8. The method according to claim 6 or 7, wherein the selection of a new transmission channel (CH.n) is performed according to the steps described in one of claims 1 to 5.

9. The method according to one of claims 6 to 9, wherein once the control unit has selected a new transmission channel (CH.n), the radio transmitter (TX) sends on the transmission channel (CH.n) already in use an information signal containing information relating to its unique identifier (UID) and the new selected transmission channel, and wherein the radio receivers (RX), which receive the aforementioned signal are configured to select the new channel (CH.n) selected as the reception channel.

10. The method according to any of the preceding claims, wherein, if a radio receiver (RX) does not receive signals comprising the unique identifier (UID) of the associated radio transmitter (TX) for a given time interval, it is provided to: perform, by means of the control unit of the radio receiver (RX), a scan of all N available channels (CH.n) until a signal comprising said unique identifier (UID) to which the radio receiver (RX) is associated is received on one of said channels; and configure said radio receiver (RX) so that said radio receiver (RX) receives on the channel where said signal comprising the expected unique identifier (UID) was received.

11. A radio communication apparatus, for use in a system of communication apparatus, said apparatus comprising at least one radio frequency radio transmitter (TX) and radio frequency radio receivers (RX), wherein the radio transmitter (TX) comprises at least: an analog / digital converter; an antenna assembly; and a control unit connected to said analog / digital converter and to said antenna assembly; wherein the radio receiver (RX) comprises at least: a digital / analog converter; an antenna assembly; and a control unit connected to the digital / analog converter and to the antenna assembly; wherein the radio transmitter (TX) is configured to transmit on a number N of channels (CH.n), each channel comprising a given frequency or frequency band, in which each radio transmitter (TX) is associated with a unique identifier (UID) included in the transmitted signals, in which the control unit is configured to automatically select the transmission channel, said control unit being further configured to: a) perform a scan to capture the signals emitted by active radio transmitters (TX) of the system within a given range, said scan being performed on each of the N channels (CH.n) and said captured signals being processed by the control unit of each radio transmitter (TX); b) generate a ranking of the signals transmitted by other radio transmitters (TX) of the system on each of the N channels on the basis of: an RSSI value of the detectable signals transmitted by the other radio transmitters (TX) of the system and, preferably, a credibility score (C) assigned to each RSSI value of the captured signals; c) select as the transmission channel (CH.n), among the N available channels, a channel (CH.n) where there are no other detectable signals, i.e. where the channel is free, or, in the case in which signals are captured on all N channels, the one where the RSSI level of the other signals is the lowest.

12. The radio communication apparatus according to claim 11, wherein, where the control unit is configured to calculate the credibility score (C) of the RSSI values ​​of the captured signals, said control unit is further configured to implement an algorithm for choosing the transmission channel, where said algorithm includes the RSSI values ​​and the respective credibility scores (C).