MITIGATING TRANSMISSION INTERFERENCE BETWEEN DIGITAL RADIO AND BROADBAND COMMUNICATION DEVICES

• US 20130122811A1
• Filed: 11/14/2011
• Published: 05/16/2013
• Est. Priority Date: 11/14/2011
• Status: Active Grant

• Current Assignee: Motorola Solutions, Inc.
• Original Assignee: Motorola Solutions, Inc.
• Inventors: BAKER, MICHAEL H., Scribano, Gino A., JIN, XIAOWEI
• Granted Patent: US 8,995,918 B2
• Time in Patent Office: Days
• US Class Current: 455/41.2
• CPC Class Codes: H04L 5/0062 Avoidance of ingress interference, e.g. ham radio channels
• CPC Class Codes: H04W 16/14 Spectrum sharing arrangements between different networks
• CPC Class Codes: H04W 4/80 Services using short range communication, e.g. near-field communication [NFC], radio-frequency identification [RFID] or low energy communication
• CPC Class Codes: H04W 72/541 using the level of interference

Abstract

A broadband device (105) can detect a proximate narrowband transmission (152) from a narrowband communication device (145). The narrowband transmission (152) can be in close enough proximity (155) to at least one bearer channel of the broadband device (105) to result in interference on the narrowband reception (152) when the broadband device (105) is transmitting and the narrowband communication device (145) is concurrently receiving. Responsive to the detecting, the broadband device (105) can gate a broadband transmission (142) to ensure the broadband transmission (142) does not interfere with the proximate narrowband reception (152). In absence of detecting the narrowband transmission (152), the broadband transmission (142) from the broadband device (105) would not be gated.

Claims

1. A method for mitigating radio frequency interference comprising:

detecting at a broadband device, a proximate narrowband transmission from a narrowband communication device, wherein the narrowband transmission is in close enough proximity to at least one bearer channel of the broadband device to result in interference on the narrowband reception when the broadband device is transmitting and the narrowband communication device is receiving concurrently; and

responsive to the detecting, the broadband device gating a broadband transmission to ensure the broadband transmission does not interfere with the proximate narrowband reception, wherein in absence of detecting the narrowband transmission the broadband transmission from the broadband device would not be gated.

2. The method of claim 1, wherein the broadband transmission and the narrowband reception operate in a 700 MHz frequency band.

3. The method of claim 1, wherein the gating of the broadband transmission is for a previously established time between five and fifteen seconds.

4. The method of claim 1, wherein the previously established time is a user-configurable time, which is configurable at the broadband device.

5. The method of claim 1, wherein the broadband device is a 3GPP-conforming network communication device that communicates with a mobile broadband network, wherein the narrowband device is a two-way radio that communicates with a base station and other two-way radios.

6. The method of claim 1, further comprising:

the broadband device utilizing a radio frequency (RF) power detector to detect narrowband transmissions from the narrowband communication device, wherein the gated transmission of the broadband device is enacted for a previously configured delay between five and fifteen seconds upon the detection of the proximate narrowband transmission.

7. The method of claim 1, further comprising:

the broadband device utilizing a wireless personal area network (PAN) transceiver to detect reception indication data conveyed by the narrowband communication device over a personal area network, wherein the broadband device uses the reception indication data to gate the broadband transmission while any proximate narrowband reception from the narrowband communication device is occurring.

8. The method of claim 1, further comprising:

detecting a transmission from the narrowband device using a radio frequency (RF) power detector component of the broadband device;

at the time of the detection of the transmission termination, determining that the broadband device is transmitting data that is likely to cause interference after the detected transmission termination;

halting transmission of the data being transmitted from the broadband device;

waiting for a delay period of a previously determined time between five and fifteen seconds; and

after the delay period, automatically enabling transmission of data from the broadband device.

9. The method of claim 1, further comprising:

establishing a personal area network (PAN) connection between PAN components of the broadband device and the narrowband communication device;

conveying data over the PAN connection from the narrowband communication device to the broadband device to indicate when receptions from the narrowband communication device are occurring;

at the time that receptions are occurring from the narrowband device, as determined from the data conveyed over the PAN connection, determining that the broadband device is to transmit data that is likely to cause interference with the detected reception;

halting transmission of the data from the broadband device for periods where the narrowband communication device is receiving, as determined from the data conveyed over the PAN connection; and

automatically enabling transmission of data from the broadband device when the narrowband communication device is no longer receiving, as determined from the data conveyed over the PAN connection.

10. The method of claim 1, further comprising:

responsive to gating, determining whether gated transmissions are to be buffered for later transmission or discarded;

wherein the method of determining whether gated transmissions are to be buffered for later transmission or discarded utilizes one or combination of;

data traffic type, quality of service, duration of gating period; and

if results of the determining indicate gated transmissions are to be buffered, the broadband device buffering the gated transmission for a duration after which the gated transmissions are transmitted by the broadband device; and

if results of the determining indicate gated transmissions are to be discarded, the broadband device discarding the gated transmissions.

11. The method of claim 1, wherein the gating further comprises one or combination of:

implementing a rate-limiting buffer below the IP stack to gate the broadband transmission; and

utilizing a 3GPP-defined signaling method to suspend the broadband transmission.

12. A computer program product for mitigating radio frequency interference between two proximate communication devices, the computer program product comprising:

one or more computer-readable, tangible storage devices;

program instructions, stored on at least one of the one or more storage devices, to detect at a broadband device, a proximate narrowband transmission from a narrowband communication device, wherein the narrowband transmission is in close enough proximity to at least one bearer channel of the broadband device to result in interference on the narrowband reception when the broadband device is transmitting and the narrowband communication device is receiving concurrently; and

program instructions, stored on at least one of the one or more storage devices, to, responsive to detecting the proximate narrowband transmission, gate a broadband transmission to ensure the broadband transmission does not interfere with the proximate narrowband reception, wherein in absence of detecting the narrowband transmission the broadband transmission from the broadband device would not be gated.

13. A system for mitigating RF interference between narrowband public safety and broadband communications devices comprising:

a narrowband radio communications device configured to transmit and receive narrowband communications; and

a 3GPP-conforming network communications device configured to communicate with a 3GPP-conforming network, said 3GPP-conforming network communications device further comprises;

a transmission interference mitigator configured to mitigate the potential for interference between the narrowband radio communications device and the 3GPP-conforming network communications device by selectively throttling transmissions of the 3GPP-conforming network communications device when receptions of the narrowband radio are likely to be occurring within close proximity to the 3GPP-conforming network communication device.

14. The system of claim 13, wherein the narrowband communications are in close enough proximity to at least one bearer channel of the 3GPP-conforming network communications device to result in interference on the narrowband communications when the two devices are concurrently transmitting and receiving.

15. The system of claim 13, wherein the narrowband communications are in the 700 MHz frequency band and wherein at least one bearer channel of the 3GPP-conforming network device operates in the 700 MHz frequency band.

16. The system of claim 13, wherein said 3GPP-conforming network communications device further comprises:

a radio frequency (RF) power detector configured to detect narrowband transmissions from the narrowband radio communications device;

a gate interval defining a quantity of time that transmissions of the 3GPP-conforming network communications device are to be selectively gated, wherein the transmission interference mitigator is configured to gate transmissions for the quantity of time responsive to the radio frequency power detector detecting termination of the narrowband transmissions, wherein the quantity of time is between five and fifteen seconds, which represents a time delay expected for a person to respond to a two-way radio voice communication prompt.

17. The system of claim 16, wherein the radio frequency power detector is configured to detect when narrowband transmissions from the narrowband radio communications device stops, wherein the transmission interference mitigator is configured to gate otherwise unabated transmissions from the 3GPP-conforming network communications device responsive to detecting that narrowband radio communications has stopped its transmissions.

18. The system of claim 13, wherein the narrowband radio communications device further comprises:

a personal area network transceiver configured to convey data over a wireless personal area network to indicate within data when receptions of the narrowband device start and stop, wherein the 3GPP-conforming network communications device comprises a personal area network transceiver configured to receive data over the wireless personal area network and to coordinate transmissions of the 3GPP-conforming network communications device to occur when no receptions are occurring from a narrowband radio communications device within personal area network range of the 3GPP-conforming network communications device.

19. The system of claim 18, wherein said transmission interference mitigator establishes a priority level for transmissions from the 3GPP-conforming network communications device and a priority level for receptions from the narrowband radio communications device, wherein data conveyed over the personal area network ensures that whichever of the 3GPP-conforming network device and the narrowband radio communication device having the lowest priority will gate transmissions while receptions by the other one of the devices is occurring wherein the personal area network transceiver of the narrowband radio communications device and of the 3GPP-conforming network communications device are each BLUETOOTH transceivers.

20. The system of claim 18, wherein the personal area network transceiver of the narrowband radio communications device transmits messages over the personal area network when narrowband receptions of the narrowband communications device start and end, wherein the transmission interference mitigator uses knowledge of when the narrowband communications devices starts and ends its receptions to ensure that no transmissions from the 3GPP-conforming network communications device are occurring concurrent with receptions of the narrowband communications device.