Tropospheric ducting interference mitigation in a wireless
AssigneeT-Mobile Innovations LLC
InventorAkin Ozozlu
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Abstract
Methods for mitigating the effects of an atmospheric-based interference event on the propagation of a radio frequency signal are provided. A wireless communication network can determine that tropospheric ducting interference is occurring, causing radio frequencies to travel much further than anticipated. In response to the determination of tropospheric ducting interference, the system dynamically adjusts the special subframe configurations within a victim base station. The system switches from a high downlink/uplink capacity special subframe configuration to a special subframe configuration designed to limit the tropospheric ducting interference. This switch increases the guard period between transmissions, thereby reducing signal overlap and mitigating interference from tropospheric ducting.
Claims13
A method for mitigating interference caused by tropospheric ducting in a wireless telecommunication network, the method comprising:
- determining that time-of-flight interference is occurring at a victim base station;
- determining that the victim base station is communicating using a first special subframe (SSF) configuration, the first SSF configuration comprising a first number of gap symbols;
- and
- based at least in part on the determining that time-of-flight interference is occurring and that the victim base station is communicating using the first SSF configuration,
- causing the victim base station to switch from the first SSF configuration to a second SSF configuration, the second SSF configuration comprising a second number of gap symbols,
- wherein the second number of gap symbols exceeds the first number of gap symbols;
- wherein the determining that time-of-flight interference is occurring at the victim base station is based in part on monitoring one or more metrics associated with the victim base station and
- determining that at least one of the one or more metrics has exceeded a pre-determined threshold;
- wherein the monitoring of the one or more metrics comprises monitoring an uplink received signal strength indicator (UL RSSI) and an uplink block error rate;
- wherein the determining that at least one of the one or more metrics has exceeded the pre-determined threshold comprises
- determining that the UL RSSI has exceeded a first threshold and that the uplink block error rate has exceeded a second threshold.
A system for mitigating interference caused by tropospheric ducting in a wireless telecommunication network, the system comprising:
- one or more non-transitory computer processing components configured to perform operations comprising:
- monitoring one or more metrics associated with a victim base station;
- determining that at least one of the one or more metrics has exceeded a pre-determined threshold;
- based at least in part on the at least one of the one or more metrics exceeding the pre-determined threshold,
- determining that time-of-flight interference is occurring at the victim base station;
- determining that the victim base station is communicating using a first special subframe (SSF) configuration;
- and
- based on the determining that time-of-flight interference is occurring and that the victim base station is communicating using the first SSF configuration, causing the victim base station to switch from the first SSF configuration to a second SSF configuration;
- wherein the one or more non-transitory computer processing components are configured to cause the victim base station to switch from the second SSF configuration to the first SSF configuration upon determining that time-of-flight interference has fallen below the pre-determined threshold;
- wherein the one or more non-transitory computer processing components are configured to maintain the second SSF configuration for a pre-determined period before causing the victim base station to switch from the second SSF configuration to the first SSF configuration.
A non-transitory computer readable media having instructions stored thereon that, when executed by one or more computer processing components, cause the one or more computer processing components to perform a method for mitigating interference caused by tropospheric ducting in a wireless telecommunication network, the method comprising:
- determining that at least one of one or more metrics for the wireless telecommunication network has exceeded a pre-determined threshold;
- based at least in part on the at least one of the one or more metrics exceeding the pre-determined threshold,
- determining that time-of-flight interference is occurring at a victim base station;
- determining that the victim base station is communicating using a first special subframe (SSF) configuration;
- and
- based on the determining that time-of-flight interference is occurring and that the victim base station is communicating using the first SSF configuration, causing the victim base station to switch from the first SSF configuration to a second SSF configuration;
- wherein the one or more metrics include an uplink received signal strength indicator (UL RSSI) and an uplink block error rate (BLER);
- causing the victim base station to switch from the second SSF configuration to the first SSF configuration upon determining that the one or more metrics has fallen below the pre-determined threshold.
Dependencies are inferred from the claim text.