Signal measurement on component carriers in wireless communication systems
A method in a wireless communication terminal including generating a first averaged signal measurement on a first carrier frequency, wherein the first averaged signal measurement is based on a first averaging period, producing a first filter output based on the first averaged signal measurement weighted by a first weight, generating a second averaged signal measurement on the first carrier frequency, wherein the second averaged signal measurement is based on a second averaging period, and producing a second filter output based on the first filter output and based on the second averaged signal measurement weighted by a second weight, wherein the first weight is less than the second weight if the second averaging period is greater than a threshold.
1. A method in a wireless communication terminal, the method comprising:
generating a first averaged signal measurement on a first carrier frequency, wherein the first averaged signal measurement is based on a first averaging period;
producing a first filter output based on the first averaged signal measurement weighted by a first weight, wherein the first weight is based on a parameter received from a base station;
generating a second averaged signal measurement on the first carrier frequency, wherein the second averaged signal measurement is based on a second averaging period; and
producing a second filter output based on the first filter output and based on the second averaged signal measurement weighted by a second weight;
wherein the first weight is different from the second weight if the second averaging period is greater than a threshold.
2. The method of claim 1 wherein the first weight is less than the second weight if the second averaging period is greater than the threshold.
3. The method of claim 1 further comprising producing a third filter output subsequent to producing the second filter output wherein the third filter output is based on the first weight.
4. The method of claim 1 further comprising reporting the second filter output to a serving base station.
5. The method of claim 3 , receiving a handover command from the serving base station in response to the reporting.
6. The method of claim 4 further comprising handing over to a second base station serving a different coverage area than the serving base station in response to receiving the handover command.
7. The method of claim 5 , wherein a first serving cell on the first carrier frequency is a deactivated serving cell, the method further comprising configuring the first serving cell as a primary serving cell in response to receiving the handover command.
8. The method of claim 1 further comprising:
producing the first filter output by using a first filter coefficient;
producing the second filter output using a second filter coefficient if the second averaging period is greater than the threshold,
wherein the second filter coefficient is different than the first filter coefficient.
9. The method of claim 1 wherein the second filter coefficient has a value that negates the first filter output component of the second filter output.
10. The method of claim 8 ,
wherein the first averaged signal measurement and the second averaged signal measurement are averaged layer 1 signal measurements, and
wherein the first filter output and the second filter output are layer 3 filtered measurements.
11. The method of claim 1 , wherein the first filter output and second filter output are infinite impulse response filter outputs.
12. The method of claim 1 , wherein the wireless communication terminal is configured for carrier aggregation, and wherein the first carrier frequency is a deactivated carrier.
13. The method of claim 1 further comprising receiving a message ordering the terminal to perform the signal measurements on the first carrier frequency using the second averaging period.