Enabling coexistence between fdd and tdd wireless networks

A method of detecting and mitigating interference between a wireless frequency division duplex (FDD) communications device in communication with an FDD base station and a wireless time division duplex (TDD) communications device, wherein an FDD uplink frequency band includes first and second frequencies, such that the first frequency is adjacent to a TDD transmission frequency band, the method comprising:

• determining, using a processor, whether a monitored value of an operational parameter of the FDD device is within a fixed range of a maximum value of the operational parameter;
• and
• responsive to a determination that the monitored value of the operational parameter of the FDD device is within the fixed range of the maximum value of the operational parameter, performing at least one of:
• configuring the FDD base station such that the FDD base station receives data packets from the FDD device on a reduced-interference frequency selected from within the FDD uplink frequency band such that the reduced-interference frequency is either closer to the second frequency than the first frequency, or the reduced-interference frequency is at a center of the FDD uplink frequency band, or
• configuring the FDD base station such that the FDD device does not transmit data packets to the FDD base station during a TDD downlink time interval.

An apparatus capable of operating in a wireless network, and detecting and mitigating interference between wireless devices, the apparatus comprising:

• a transceiver configured to exchange FDD data packets with a wireless frequency division duplex (FDD) communications device, such that an FDD uplink frequency band includes first and second frequencies, such that the first frequency is adjacent to a TDD transmission frequency band of a TDD network;
• a parameter-monitoring module to determine if a monitored value of an operational parameter of the FDD device is within a fixed range of a maximum value of the operational parameter;
• a memory device configured to store the monitored value of the operational parameter of the FDD device, and frame information including a TDD downlink time interval associated with TDD frames;
• and
• a configuration-adjustment module that, responsive to a determination that the monitored value is within the fixed range of the maximum value of the operational parameter, configures the transceiver such that:
• the transceiver receives FDD data packets from the FDD device on a reduced-interference frequency selected from within the FDD uplink frequency band such that the reduced-interference frequency is either closer to the second frequency than the first frequency, or the reduced-interference frequency is at a center of the FDD uplink frequency band, or
• the FDD device does not transmit data packets to the transceiver during the TDD downlink time interval.