Mobile equipment based filtering for packet radio service

• US 7,383,022 B2
• Filed: 02/16/2007
• Issued: 06/03/2008
• Est. Priority Date: 12/09/1999
• Status: Expired due to Term

• Current Assignee: Conversant Wireless Licensing S.à.r.l. (f/k/a Core Wireless Licensing S.a.r.l.) (MOSAID Technologies Inc. (f/k/a Conversant Intellectual Property Management))
• Original Assignee: Nokia Corporation
• Inventors: Nikula, Eero, Zhao, Yuping, Sebire, Guillaume
• Primary Examiner(s): Nguyen, David Q
• Application Number:
  US11/707,525
• Publication Number:
  US 20070149134A1
• Time in Patent Office: 473 Days
• Field of Search: 455/67.1, 455/522, 455/456, 455/67.3, 455/69, 455/63, 455/65, 455/432
• US Class Current: 455/67.11
• CPC Class Codes: H04L 1/0026 Transmission of channel quality indication
• CPC Class Codes: H04L 1/20 using signal quality detector

Abstract

A method for operating a mobile equipment (ME 10) in a wireless network (12) includes determining 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 step of determining includes steps of (a) deriving an indication of ME speed in the wireless network; and (b) transmitting the speed indication to the ME using a point-to-point message.

Claims

1. A method comprising:

calculating a default forgetting factor based on a parameter received in a broadcast message;

wirelessly receiving, at a mobile equipment and from a network, an indication of signal quality experienced by the mobile equipment;

modifying the default forgetting factor to set 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 an indication of the filtered link quality measurement data to the network.

2. The method of claim 1, wherein the indication of signal quality comprises an indication of the 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 the sequence of link quality measurement data comprises bit error probability.

5. The method of claim 1, wherein the indication of the filtered link quality measurement data comprises mean bit error probability.

6. The method of claim 1, wherein the indication of the filtered link quality measurement data comprises coefficient of variation of bit error probability.

7. A mobile equipment comprising:

a receiver adapted to wirelessly receive from a network an indication of signal quality experienced by the mobile equipment and to receive from the network a broadcast message that includes a parameter;

a processor adapted to calculate a default forgetting factor based on the parameter received in the broadcast message and to modify the default forgetting factor 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 said received indication of signal quality; and

a transmitter, coupled to the processor, adapted to transmit an indication of the filtered link quality measurement data to the network.

8. The mobile equipment of claim 7, wherein the indication of signal quality comprises an indication of the particularmobile equipment'"'"'s speed.

9. The mobile equipment of claim 7, wherein the indication of a signal quality is received in a point-to-point message.

10. The mobile equipment of claim 7, wherein the sequence of link quality measurement data comprises bit error probability.

11. The mobile equipment of claim 7, wherein the indication of the filtered link quality measurement data comprises mean bit error probability.

12. The mobile equipment of claim 7, wherein the indication of the filtered link quality measurement data comprises coefficient of variation of bit error probability.

13. A computer readable medium encoded with a computer program and executable by a controller of a mobile equipment for executing measurement data filtering operations, the operations comprising:

calculating a default forgetting factor based on a parameter received in a broadcast message;

modifying the default forgetting factor to set a finite length of a filter as a function of an indication of signal quality experienced by the mobile equipment, said indication of signal quality received in a wireless message;

filtering a sequence of link quality measurement data using the finite length filter; and

transmitting an indication of the filtered link quality measurement data to the network.

14. The computer program of claim 13, wherein the indication of signal quality comprises an indication of the mobile equipment'"'"'s speed.

15. The computer program of claim 13, wherein the indication of the filtered link quality measurement data comprises mean bit error probability.

16. The computer program of claim 13, wherein the indication of the filtered link quality measurement data comprises coefficient of variation of bit error probability.

17. An apparatus comprising:

receiving means for wirelessly receiving from a network an indication of signal quality experienced by the mobile equipment and a broadcast message that includes a parameter;

processing means for calculating a default forgetting factor based on the parameter received in the broadcast message and for modifying the default forgetting factor 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 said received indication of signal quality; and

transmit means for transmitting an indication of the filtered link quality measurement data to the network.