Minimization drive test with reduced wireless device memory usage
A mobile wireless communication device efficiently uses memory when performing a minimization drive test (MDT) by storing less than all of the MDT measurements. The mobile wireless communication device receives a control signal comprising MDT configuration parameters indicating at least a measurement interval. When executing the MDT, the mobile wireless communication device measures a signal characteristic of measurement signals in accordance with the MDT configuration parameters to generate a number of measurements for a measurement period. Rather than storing all of the measurements, only a number of log values corresponding to the measurements are stored in memory, where the number of log values is less than the number of measurement values.
1. A mobile wireless communication device comprising:
a memory;
a receiver configured to receive a control signal and measurement signals, the control signal comprising a minimization drive test (MDT) configuration parameter indicating at least a measurement interval;
a controller configured to:
execute a minimization drive test (MDT) comprising measuring a signal characteristic of the measurement signals in accordance with the MDT configuration parameter to generate a measurement number of measurements for a measurement period; and
log, in the memory, a log number of log values corresponding to at least some of the measurements, the log number being less than the measurement number, at least one log value corresponding to an average of two or more consecutive measurements, the average of the two or more selected measurements compared to a last log value, a new log value created from the average only when a difference between the average and the last log value is greater than or equal to a threshold.
2. The mobile wireless communication device of claim 1 , wherein at least one other log value of the log values corresponds to a selected measurement of the measurements.
3. The mobile wireless communication device of claim 1 , wherein at least one other log value of the log values is based on two or more selected measurements of the measurements.
4. The mobile wireless communication device of claim 1 , wherein the measurement signals are reference signals.
5. The mobile wireless communication device of claim 4 , wherein the signal characteristic indicates a quality of the measurement signals.
6. The mobile wireless communication device of claim 5 , wherein the signal characteristic is selected from Reference Signal Received Power (RSRP) and Reference Signal Received Quality (RSRQ) value.
7. The mobile wireless communication device of claim 1 , wherein the controller is configured to measure the signal characteristic of the measurement signals in accordance with a MDT described by at least one revision of a 3rd Generation Partnership Project (3GPP) specification.
8. The mobile wireless communication device of claim 1 , wherein the control signal is a Resource Control (RRC) message and the receiver is configured to receive the MDT configuration parameter within a LoggedMeasurementConfiguration in accordance with at least one revision of a 3rd Generation Partnership Project (3GPP) Long Term Evolution (LTE) specification.
9. A method of performing a minimization of drive test (MDT), the method comprising:
obtaining a number of MDT measurement values within a measurement period;
applying a logging process to generate a number of log values representing the MDT measurement values, at least one log value of the number of log values based on two or more consecutive measurements of the MDT measurement values, the average of two or more selected measurements compared to a last log value, a new log value created from the average only when a difference between the average and the last log value is greater than or equal a threshold; and
logging the log values in memory, the number of log values less than the number of MDT measurement values.
10. The method of claim 9 , wherein at least one other log value of the number of log values corresponds to a selected measurement of the MDT measurement values.
11. The method of claim 9 , wherein the obtaining a measurement value comprises measuring a signal characteristic of a reference signal.
12. The method of claim 11 , wherein the reference signal is a pilot signal and the signal characteristic indicates a quality of the pilot signal.
13. The method of claim 12 , wherein the signal characteristic is selected from Reference Signal Received Power (RSRP) and Reference Signal Received Quality (RSRQ) values.
14. The method of claim 11 , further comprising:
measuring the signal characteristic of the pilot signals in accordance with a MDT described by at least one revision of a 3rd Generation Partnership Project (3GPP) specification.
15. The method of claim 9 , further comprising receiving a measurement interval parameter indicating a measurement interval between measurements, the measurement interval parameter transmitted from a base station within a LoggedMeasurementConfiguration message in accordance with at least one revision of a 3rd Generation Partnership Project (3GPP) Long Term Evolution (LTE) specification.