Mobile equipment based filtering for packet radio service (PRS)
View Patent ↗A method for operating a mobile equipment (ME 10 ) in a wireless network ( 12 ) includes receiving from a wireless network a parameter that is indicative of a signal quality experienced by the ME, such as by determining a speed of the ME; calculating in the ME an indication of link quality, the calculation employing a filtering operation having a filter length that is a function of the determined parameter, such as speed or derivative of the speed of the ME; and reporting the calculated indication of link quality to the wireless network. The wireless network derives an indication of ME speed and transmits the speed indication to the ME using a point-to-point message.
1. A method comprising:
receiving an indication of signal quality experienced by a particular mobile equipment;
setting a finite length of a filter as a function of the received indication of signal quality;
filtering a sequence of link quality measurement data using the finite length filter; and
transmitting from the particular mobile equipment an indication of the filtered link quality measurement data.
2. The method of claim 1 , wherein the indication of signal quality comprises an indication of the particular mobile equipment's speed.
3. The method of claim 1 , wherein the indication of a signal quality is received in a point-to-point message.
4. The method of claim 1 , wherein setting the finite length of the filter comprises setting a forgetting factor.
5. The method of claim 4 , further comprising:
calculating a default forgetting factor based on a parameter received in a broadcast message;
and wherein setting the finite length of the filter comprises modifying the default forgetting factor.
6. The method of claim 1 , wherein the sequence of link quality measurement data comprises bit error probability.
7. The method of claim 1 , wherein the indication of the filtered link quality measurement data comprises mean bit error probability.
8. The method of claim 1 , wherein the indication of the filtered link quality measurement data comprises coefficient of variation of bit error probability.
9. The method of claim 1 , executed by the particular mobile equipment.
10. The method of claim 9 , wherein the filter is disposed in the particular mobile equipment.
11. The method of claim 10 , further comprising calculating in the particular mobile equipment a default factor;
and wherein setting the finite length of the filter comprises modifying the default factor.
12. The method of claim 11 , wherein the default factor comprises a default forgetting factor that is calculated based on a parameter received from a network.
13. The method of claim 12 , wherein the parameter is received from the network in a broadcast message.
14. An apparatus comprising:
a receiver configured to receive an indication of signal quality experienced by a particular mobile equipment;
a processor configured to implement a filter for filtering a sequence of link quality measurement data, said filter having a finite filter length that is a function of the received indication of signal quality; and
a transmitter, coupled to the processor, configured to transmit an indication of the filtered link quality measurement data.
15. The apparatus of claim 14 , wherein the apparatus comprises the particular mobile equipment and the indication of signal quality comprises an indication of the particular mobile equipment's speed.
16. The apparatus of claim 14 , wherein the indication of a signal quality is received in a point-to-point message.
17. The apparatus of claim 14 , wherein the finite length comprises a forgetting factor.
18. The apparatus of claim 17 , wherein:
the receiver is further configured to receive from the network a broadcast message that includes a parameter;
and the processor is further configured to calculate a default forgetting factor based on the parameter received in the broadcast message;
and wherein the processor is configured to implement the filter by modifying the default forgetting factor.
19. The apparatus of claim 14 , wherein the sequence of link quality measurement data comprises bit error probability.
20. The apparatus of claim 14 , wherein the indication of the filtered link quality measurement data comprises mean bit error probability.
21. The apparatus of claim 14 , wherein the indication of the filtered link quality measurement data comprises coefficient of variation of bit error probability.
22. The apparatus of claim 14 , wherein the apparatus comprises the particular mobile equipment.
23. The apparatus of claim 22 , wherein the filter is disposed in the particular mobile equipment.
24. The apparatus of claim 23 , wherein the processor is configured to calculate a default factor, and is configured to implement the filter by modifying the default factor.
25. The apparatus of claim 24 , wherein the default factor comprises a default forgetting factor and the processor is configured to calculate the default forgetting factor based on a parameter received from a network.
26. The apparatus of claim 25 , wherein the parameter is received from the network in a broadcast message.
27. An apparatus comprising:
receiving means for receiving an indication of signal quality experienced by a particular mobile equipment;
processing means for implementing a filter for filtering a sequence of link quality measurement data, said filter having a finite filter length that is a function of said received indication of signal quality; and
transmit means for transmitting an indication of the filtered link quality measurement data.
28. The apparatus of claim 27 wherein the finite length of the filter is a function of a forgetting factor that is influenced by the received indication of signal quality.