Methods and apparatus for monitoring contested spectrum and/or responding to the detection of an incumbent user
A base station, e.g., a CBSD, selects or more user equipment (UE) devices, e.g., cell phones, to operate in monitoring mode. In monitoring mode the UE device, in addition to its normal communications with the base station, performs received power measurements in a frequency band, e.g., a CBRS band. The UE reports to the base station information indicating a UE determined measured power level attributed to incumbent user or measurement information used to derive a power level attributed to incumbent user. One or more base stations report received power measurement values attributed to incumbent user to a system management device, e.g., a SAS. The system management device processes the received information, e.g. combining information, and comparing a result to a threshold level. If the result exceeds the threshold the system management device sends a command to one or more base station to shut down DL traffic in the CBRS band.
1 . A method of operating a user equipment (UE) device, the method comprising:
receiving, at the UE device, a signal from a Citizens Broadband Radio Service Device (CBSD) commanding the UE device to enter a sensor mode of operation;
measuring, at the UE device, a total received power in a Citizens Broadband Radio Service (CBRS) band; and
determining, at the UE device, from at least the total received power in the CBRS band, a received power value in the CBRS band indicating an amount of received power in the CBRS band attributable to an incumbent user.
2 . The method of claim 1 , further comprising:
sending a message to the CBSD indicating the received power value indicating the amount of received power in the CBRS band attributable to the incumbent user.
3 . The method of claim 2 , further comprising:
measuring, at the UE device, received power in the CBRS band attributable to CBSDs.
4 . The method of claim 3 , wherein determining from at least the total received power in the CBRS band, a received power value in the CBRS band indicating an amount of received power in the CBRS band attributable to an incumbent user includes:
calculating the received power value in the CBRS band by subtracting the received power in the CBRS band attributable to CBSDs from the total received power in the CBRS band.
5 . The method of claim 4 , wherein said step of measuring, at the UE device, received power in the CBRS band attributable to CBSDs is performed during an interval in which a pilot or other signal of a known strength is transmitted by the CBSD.
6 . The method of claim 5 , further comprising:
transitioning, at the UE device, from a normal mode of operation to the sensor mode of operation in response to receiving the signal commanding the UE device to enter the sensor mode of operation.
7 . The method of claim 6 , further comprising:
prior to transitioning the UE device from the normal mode of operation to the sensor mode of operation, operating the UE device in the normal mode of operation, operating the UE device in the normal mode of operation including operating the UE device to communicate with the CBSD without performing monitoring operations used to detect incumbent users.
8 . The method of claim 7 , further comprising:
operating the UE device in said sensor operation mode to; measure said total received power in the CBRS band, measure received power in the CBRS band attributable to CBSDs and send the message to the CBSD indicating the received power value indicating the amount of received power in the CBRS band attributable to the incumbent user.
9 . The method of claim 8 , further comprising:
receiving at the UE device information indicating the duration that the UE device should remain in the sensor mode of operation.
10 . The method of claim 8 , wherein the UE device is a cell phone.
11 . The method of claim 1 , wherein determining from at least the total received power in the CBRS band, a received power value in the CBRS band indicating an amount of received power in the CBRS band attributable to an incumbent user includes:
subtracting a received power in the CBRS band attributable to CBSD base stations from the total received power in the CBRS band.
12 . A user equipment (UE) device, comprising:
a receiver;
a transmitter;
a processor configured to control the UE device to:
receive a signal from a Citizens Broadband Radio Service Device (CBSD) commanding the UE device to enter a sensor mode of operation;
measure a total received power in a Citizens Broadband Radio Service (CBRS) band; and
determine from at least the total received power in the CBRS band, a received power value in the CBRS band indicating an amount of received power in the CBRS band attributable to an incumbent user.
13 . The UE device of claim 12 , wherein the processor is further configured to control the UE device to:
send a message to the CBSD indicating the received power value indicating the amount of received power in the CBRS band attributable to the incumbent user.
14 . The UE device of claim 13 , wherein the processor is further configured to control the UE device to:
measure, at the UE device, received power in the CBRS band attributable to CBSDs.
15 . The UE device of claim 14 , wherein determining from at least the total received power in the CBRS band, a received power value in the CBRS band indicating an amount of received power in the CBRS band attributable to an incumbent user includes:
operating the UE device to calculate the received power value in the CBRS band by subtracting the received power in the CBRS band attributable to CBSDs from the total received power in the CBRS band.
16 . The UE device of claim 15 , wherein said processor is further configured to control the UE device to perform said step of measuring received power in the CBRS band attributable to CBSDs during an interval in which a pilot or other signal of a known strength is transmitted by the CBSD.
17 . The UE device of claim 16 , wherein the processor is further configured to control the UE device to:
transition from a normal mode of operation to the sensor mode of operation in response to receiving the signal commanding the UE device to enter the sensor mode of operation.
18 . The UE device of claim 17 , wherein the processor is further configured to control the UE device to:
operate in the normal mode of operation, operating the UE device in the normal mode of operation including operating the UE device to communicate with the CBSD without performing monitoring operations used to detect incumbent users prior to transitioning the UE device from the normal mode of operation to the sensor mode of operation.
19 . The UE device of claim 18 , wherein the processor is further configured to control the UE device to:
measure said total received power in the CBRS band, measure received power in the CBRS band attributable to CBSDs and send the message to the CBSD indicating the received power value indicating the amount of received power in the CBRS band attributable to the incumbent user while the UE device is operating in said sensor mode of operation.
20 . The UE device of claim 19 , wherein the processor is further configured to control the UE device to:
receive information indicating the duration that the UE device should remain in the sensor mode of operation.
21 . The UE device of claim 19 , wherein the UE device is a cell phone.
22 . The UE device of claim 12 , wherein the processor, as part of being configured to determine from at least the total received power in the CBRS band, a received power value in the CBRS band indicating an amount of received power in the CBRS band attributable to an incumbent user is configured to:
calculate the received power value in the CBRS band by subtracting a received power in the CBRS band attributable to CBSD base stations from the total received power in the CBRS band.