Measurement report reliability in wireless communication systems

1. A method in a mobile station for measurement reporting in a wireless system, the method comprising:

detecting presence of a cell;

applying a first filter to a first number of measurement samples of a first measurement quantity of the cell, the first number of measurement samples being determined from a switch point; and

applying a second filter to a plurality of measurement samples obtained from measurements made subsequent to the first number of measurement samples;

wherein the first number of measurement samples of the first measurement quantity is determined as a ratio of corresponding measurement samples of each of a second measurement quantity and a third measurement quantity; and

wherein determining the first number of measurement samples from the switch point includes computing a ratio of the arithmetic average of the first number of samples of the second measurement quantity to an arithmetic average of a first number of samples of the third measurement quantity.

2. The method according to claim 1 , wherein determining the first number of measurement samples from the switch point includes computing an arithmetic average of the first number of measurement samples.

3. The method according to claim 2 , wherein computing the arithmetic average of the first number of measurement samples includes computing the arithmetic average of the first number of measurement samples in a linear domain.

4. The method according to claim 2 , wherein computing the arithmetic average of the first number of measurement samples includes computing the arithmetic average of the first number of measurement samples in a logarithmic domain.

5. The method according to claim 1 , wherein the second filter is an infinite impulse response filter.

6. The method according to claim 1 , wherein determining the first number of measurement samples from the switch point includes applying the first filter to a subset of the first number of measurement samples.

7. The method according to claim 1 , wherein

the first number of measurement samples of the first measurement quantity is determined as a ratio of corresponding measurement samples of each of a second measurement quantity and a third measurement quantity, and

applying a first filter to a first number of measurement samples of a first measurement quantity of the cell, the first number of measurement samples being determined from the switch point includes computing an arithmetic average of ratios of corresponding samples of each of the first number of samples of the second measurement quantity and the third measurement quantity.

8. The method according to claim 1 , wherein the switch point is a number of measurement samples, and the value of the first number of measurement samples is equal to the switch point.

9. The method according to claim 1 , wherein the switch point is a duration of time, and the first number of measurement samples include only measurement samples corresponding to measurements made in the duration of time.

10. The method according to claim 1 , wherein the first measurement quantity of the cell is Reference Symbol Received Power (RSRP).

11. The method according to claim 1 , wherein the first measurement quantity of the cell is Reference Symbol Received Quality (RSRQ).

12. The method according to claim 1 , wherein

receiving a measurement configuration including a switch point further includes receiving a plurality of reporting criteria,

calculating a result of applying a first filter to a first number of measurement samples of a first measurement quantity of the cell,

comparing the result to at least one of the plurality of reporting criteria and determining that at least one of a plurality of reporting criteria are satisfied, and

transmitting a measurement report.

13. The method according to claim 1 , further including

determining that a triggering condition has been met,

determining that the instant defined by the switch point has occurred, and

sending a measurement report.

14. The method according to claim 13 , further including

determining that the instant defined by the switch point has not occurred,

determining that there are no measurement opportunities prior to the switch point instant, and

sending a measurement report.