Mitigating signal interference

• US 9,287,911 B1
• Filed: 08/22/2012
• Issued: 03/15/2016
• Est. Priority Date: 08/22/2012
• Status: Active Grant

• Current Assignee: Sprint Spectrum LP (Deutsche Telekom AG)
• Original Assignee: Sprint Spectrum LP (Deutsche Telekom AG)
• Inventors: Chindapol, Aik, Vivanco, Daniel, Liu, Chunmei
• Primary Examiner(s): Jackson, Blane J
• Application Number:
  US13/592,132
• Time in Patent Office: 1,301 Days
• Field of Search: 455/513, 455/522, 455/436, 455437-445, 455/453, 455/63.1, 455/67.11, 370/328, 370/329, 370/331
• US Class Current: 1/1
• CPC Class Codes: H04B 1/10 Means associated with receiver for limiting or suppressing noise or interference
• CPC Class Codes: H04B 1/406 with more than one transmission mode, e.g. analog and digital modes
• CPC Class Codes: H04W 36/00837 Determination of triggering parameters for hand-off
• CPC Class Codes: H04W 36/20 for optimising the interference level

Abstract

In systems and methods of mitigating L-band signal interference in a wireless communication system, it is determined that an aggregate power level of a plurality of wireless devices using an L-band carrier in communication with an access node meets a power level threshold. A probability of successful handover to a second carrier for each of the wireless devices is determined. At least one of the wireless devices is selected based on the determined probability of successful handover and a transmit power metric of the wireless device, and the selected at least one wireless device can be handed over to the second carrier.

Claims

1. A method for mitigating signal interference between frequency bands in a wireless communication system, comprising:

determining that an aggregate power level based on a combined power of a plurality of wireless devices using a first carrier for communication with an access node meets a power level threshold for the first carrier;

determining a probability of successful handover to a second carrier for each of the wireless devices, wherein the second carrier is a distinct frequency band from the first carrier, wherein determining a probability of successful handover further comprises;

receiving for each wireless device at least one of an application requirement of an application, a quality of service (QoS) requirement, and an indication of the second carrier, wherein the second carrier is supported by the wireless device, and wherein the application requirement is determined by deep packet inspection of data from each wireless device; and

determining a probability of successful handover to the second carrier based on at least one of resources available on the second supported carrier, the application requirement, and the QoS requirement;

determining a transmit power metric for each of the wireless devices using the first carrier, wherein the transmit power metric represents a contribution by transmissions of each wireless device to the aggregate power level of the plurality of wireless devices using the first carrier for communication with the access node;

selecting at least one wireless device of the plurality of wireless devices when the determined probability of successful handover from the first carrier to the second carrier is above a first probability threshold and the determined transmit power metric is above a first transmit power metric threshold for each of the selected wireless devices from among the plurality of wireless devices using the first carrier;

handing over the selected at least one wireless device to the second carrier;

determining whether the aggregate power level for wireless devices continuing to use the first carrier remains at or above the power level threshold; and

selecting additional wireless devices for handover based on second probability threshold and a second transmit power metric threshold and handing over the additionally selected wireless devices until the determined aggregate power level for wireless devices using the first carrier is below the power level threshold.

2. The method of claim 1, wherein the transmit power metric comprises at least one of a transmit power level, a power headroom, a carrier interference-to-noise ratio, and a received signal strength indicator.

3. The method of claim 1, further comprising:

limiting access to the first carrier to the plurality of wireless devices to prevent an additional wireless device from an additional device from using the first carrier to maintain the aggregate power level below the power level threshold.

4. A method for mitigating L-band signal interference in a wireless communication system, comprising:

determining that an aggregate power level of a plurality of wireless devices using an L-band carrier in communication with an access node meets a power level threshold for the L-band carrier;

determining a probability of successful handover to a second carrier for each of the wireless devices, wherein the second carrier is a distinct frequency band from the L-band carrier, wherein determining a probability of successful handover further comprises;

receiving for each wireless device at least one of an application requirement of an application, a quality of service (QoS) requirement, and an indication of the second carrier, wherein the second carrier is supported by the wireless device, and wherein the application requirement is determined by deep packet inspection of data from each wireless device; and

determining a probability of successful handover to the second carrier based on at least one of resources available on the second supported carrier, the application requirement, and the QoS requirement;

determining a transmit power metric for each of the wireless devices using the L-band carrier, wherein the transmit power metric represents a contribution by transmissions of each wireless device to the aggregate power level of the plurality of wireless devices using the L-band carrier for communication with the access node;

selecting at least one of the wireless devices when the determined probability of successful handover from the L-band carrier to the second carrier is above a probability threshold and the determined transmit power metric is above a transmit power metric threshold for each of the selected wireless devices from among the plurality of wireless devices; and

sending a command for the selected at least one wireless device to reduce the aggregate power level below the power level threshold by reducing each transmit power metric below the transmit power metric threshold for the selected wireless devices.

5. The method of claim 4, wherein sending a command further comprises:

sending a command that the selected at least one wireless device be handed over to the second carrier to reduce the aggregate power level below the power threshold.

6. The method of claim 4, wherein sending a command further comprises:

sending a command that the selected at least one wireless device reduce a transmit power to reduce the aggregate power level below the power level threshold.

7. The method of claim 4, wherein sending a command further comprises:

sending a command to terminate a call session of the selected at least one wireless device to reduce the aggregate power level below the power level threshold.

8. The method of claim 4, further comprising:

limiting access to the L-band carrier to the plurality of wireless devices to prevent an additional wireless device from using the L-band carrier to maintain the aggregate power level below the power level threshold.

9. A system for mitigating signal interference in a wireless communication system, comprising:

a processing node configured to;

determine that an aggregate power level of a plurality of wireless devices using a first carrier in communication with an access node meets a power level threshold;

determine a probability of successful handover to a second carrier for each of the wireless devices, wherein to determine a probability of successful handover, the processing node is further configured to;

receive for each wireless device at least one of an application requirement of an application, a quality of service (QoS) requirement, and an indication of the second carrier, wherein the second carrier is supported by the wireless device, and wherein the application requirement is determined by deep packet inspection of data from each wireless device; and

determine a probability of successful handover to the second carrier based on at least one of resources available on the second supported carrier, the application requirement, and the QoS requirement;

determine a transmit power metric for each of the wireless devices using the first carrier, wherein the transmit power metric represents a contribution by transmissions of each wireless device to the aggregate power level of the plurality of wireless devices using the first carrier for communication with the access node;

select at least one wireless device of the plurality of wireless devices when the determined probability of successful handover from the first carrier to the second carrier is above a probability threshold and the determined transmit power metric is above a transmit power metric threshold for each of the selected wireless devices from among the plurality of wireless devices using the first carrier; and

command a handover of the selected at least one wireless device to the second carrier to reduce the aggregate power level below the power level threshold.

10. The system of claim 9, wherein the transmit power metric comprises at least one of a transmit power level, a power headroom, a carrier interference-to-noise ratio, and a received signal strength indicator.

11. The system of claim 9, wherein the processing node is further configured to:

limit access to the first carrier to the plurality of wireless devices to prevent an additional wireless device from using the first carrier to maintain the aggregate power level below the power level threshold.