Methods and systems for interference immunity using frequency allocation lists in devices having embedded systems
View Patent ↗Methods and systems for performing interference mitigation (immunity management) in a radio communication device. A list of frequencies is provided from at least one radio subsystem to an immunity management (IMM) module. The IMM module determines whether any of the frequencies in the list represent a conflict with harmonics associated with one or more clock frequencies associated with one or more embedded systems. If a conflict exists, then the IMM module makes a change in the fundamental frequency of the corresponding clock to remove the conflict, while also ensuring that other frequencies in the list are not impacted by the change. The potential need to change clock frequencies can be evaluated at state transitions of the device, e.g., call establishment, call release, handover or channel re-allocation events.
1. A radio communication device comprising:
at least one embedded system;
at least one radio communication subsystem configured to transmit and receive radio communication signals and to provide a list of frequencies, which have been allocated to the radio communication device for communication with at least one corresponding radio communication network, to an immunity management (IMM) module, wherein the list of frequencies includes a hopping sequence of frequencies used by the at least one radio communication subsystem to periodically change its receive and/or transmit frequency;
wherein the IMM module is configured to determine whether any of the frequencies in the list of frequencies conflicts with any harmonics associated with one or more clock frequencies used by the one or more embedded systems; and
wherein if a conflict exists, then the IMM module is configured to adjust a corresponding one of the one or more clock frequencies by a predetermined amount to resolve the conflict and to ensure that any harmonics associated with the adjusted corresponding clock frequency also do not conflict with any of the frequencies in the list of frequencies; and
wherein the radio device is further configured to adjust the corresponding one of the one or more clock frequencies only when a state transition occurs for the radio communication device, wherein the state transition consists of call establishment, call release, channel reallocation, and handover.
2. The radio device of claim 1 , wherein said at least one radio communication subsystem includes a 2G/2G+ cellular modem subsystem.
3. The radio device of claim 2 , wherein said at least one radio communication subsystem includes a connectivity subsystem which supports communications by the radio communication device using both wireless local area network (WLAN) and Bluetooth® (BT) radio communication standards.
4. The radio device of claim 3 , wherein the frequency list includes a frequency hopping sequence associated with a channel allocated to the radio communication device by a 2G/2G+ network, at least one WLAN frequency and at least one BT frequency.
5. The radio device of claim 1 , wherein the at least one embedded subsystem includes at least one of: a camera serial interface (CSI) processing element which controls a camera, a display serial interface (DSI) which controls a display, a dual data rate (DDR) processing element which controls a non-persistent memory and a multimedia card (MMC) processing element which controls a memory card.
6. The radio device of claim 1 , wherein the hopping sequence of frequencies includes a set of individual frequencies within a frequency band, the conflict determination involves determining whether any of the individual frequencies within the frequency band conflict with any harmonics associated with one or more clock frequencies used by the one or more embedded systems, the adjusting resolves conflicts with all of the individual frequencies within the frequency band, and the state transition involves use of a new hopping sequence of individual frequencies within the frequency band.
7. A method for immunity management associated with one or more embedded systems operating within a radio communication device, the method comprising:
providing, by at least one radio communication subsystem, a list of frequencies, which have been allocated to the radio communication device for communication with at least one corresponding radio communication network, to an immunity management (IMM) module, wherein the list of frequencies includes a hopping sequence of frequencies used by the at least one radio communication subsystem to periodically change its receive and/or transmit frequency;
determining, by the IMM module, whether any of the frequencies in the list of frequencies conflicts with any harmonics associated with one or more clock frequencies used by the one or more embedded systems; and
if a conflict exists, then adjusting a corresponding one of the one or more clock frequencies by a predetermined amount to resolve the conflict and to ensure that any harmonics associated with the adjusted corresponding clock frequency also do not conflict with any of the frequencies in the list of frequencies, wherein the steps of providing, determining, and adjusting are performed only when a state transition occurs for the radio communication device, wherein the state transition consists of call establishment, call release, channel reallocation, and handover.
8. The method of claim 7 , wherein said at least one radio communication subsystem includes a 2G/2G+ cellular modem subsystem.
9. The method of claim 8 , wherein said at least one radio communication subsystem includes a connectivity subsystem which supports communications by the radio communication device using both wireless local area network (WLAN) and Bluetooth® (BT) radio communication standards.
10. The method of claim 9 , wherein the frequency list includes a frequency hopping sequence associated with a channel allocated to the radio communication device by a 2G/2G+ network, at least one WLAN frequency and at least one BT frequency.
11. The method of claim 7 , wherein the at least one embedded subsystem includes at least one of: a camera serial interface (CSI) processing element which controls a camera, a display serial interface (DSI) which controls a display, a dual data rate (DDR) processing element which controls a non-persistent memory and a multimedia card (MMC) processing element which controls a memory card.
12. The method of claim 7 , wherein the at least one embedded subsystem includes at least one of: a camera serial interface (CSI) processing element which controls a camera, a display serial interface (DSI) which controls a display, a dual data rate (DDR) processing element which controls a non-persistent memory and a multimedia card (MMC) processing element which controls a memory card.
13. The method of claim 7 , wherein the hopping sequence of frequencies includes a set of individual frequencies within a frequency band, the conflict determination involves determining whether any of the of individual frequencies within the frequency band conflict with any harmonics associated with one or more clock frequencies used by the one or more embedded systems, the adjusting resolves conflicts with all of the individual frequencies within the frequency band, and the state transition involves use of a new hopping sequence of individual frequencies within the frequency band.