Method for enabling radioelectric coexistence between two PMR devices of which one is a narrowband type and the other is a broadband type

1. A method for enabling radioelectric coexistence between two devices based on personal mobile radio or Private Mobile Radio (PMR) technology, of which one is a narrow band device and the other is a broadband device, and each device interacts via a radioelectric link with respective base stations connected to corresponding control units for the radio resource of their respective networks, the method comprising:

detecting the presence of a narrow band radioelectric device in the vicinity of the broadband device;

transmitting a message on the broadband network directed to the control unit of the broadband network to indicate the presence of a possible narrow band device close to the broadband device; and

assigning, by the control unit of the broadband network, new frequency blocks for uplinks, only in predefined allocated periods.

2. The method according to claim 1 , wherein before the message is sent to the broadband network, an explicit indication providing information about the periods in which the transmission of the broadband device is authorized to transmit is determined in the structure of a frame transmitted by the narrow band device.

3. The method according to claim 2 , wherein the indication of the periods in which the transmission of broadband device is authorized to transmit is associated with a display of a sequence of binary elements.

4. The method according to claim 2 , wherein the indication of the periods in which the transmission of broadband device is authorized to transmit is associated with a display of a contextual list.

5. The method according to claim 2 , wherein the structure of the frame comprises a reference number corresponding to the system of the narrow band device that has been detected in the vicinity of the broadband device.

6. The method according to claim 1 wherein determination of the presence of the narrow band device is effected by manual activation at the device via a switch.

7. The method according to claim 1 wherein the determination of the presence of the narrow band device is achieved by a configuration in a configuration menu of device.

8. The method according to claim 1 , wherein the determination of the presence of the narrow band device is achieved by reception of an electric signal via sensors or elements associated with the device.

9. The method according to claim 8 , wherein the determination is performed by automatic detection of narrow band carriers located close to broadband device while the narrow band device is in a transmission phase.

10. The method according to claim 9 , wherein the automatic detection of narrow band frequency carriers is performed by continuous measurement of the power level of said carriers.

11. The method according to claim 8 , wherein the determination is performed by a transmission of specific messages between the narrow band device and the broadband device while they are close to one another.

12. The method according to claim 11 , wherein in order to carry out this transmission of messages, the narrow band device and the broadband device employ WPAN/WLAN technology.

13. The method according to claim 11 , wherein the exchange of messages between the narrow band and broadband devices has a relatively long broadcast periodicity compared with the duration of the transmission of the messages.

14. The method according to claim 13 , wherein the power level for the broadcast of the messages is relatively low.

15. A system for assuring radioelectric coexistence between two devices based on personal mobile radio or Private Mobile Radio (PMR) technology, of which one is a narrow band device and the other is a broadband device, and each device interacts via a radioelectric link with respective base stations connected to corresponding control units for the radio resource of their respective networks, wherein said system is configured to implement the method according to claim 1 .