Method and apparatus for reception quality indication in wireless communication

• US 20020081977A1
• Filed: 12/21/2000
• Published: 06/27/2002
• Est. Priority Date: 12/21/2000
• Status: Active Grant

• Current Assignee: Matsushita Electric Industrial Company Limited (Panasonic Holdings Corporation)
• Original Assignee: Tropian, Inc. (Panasonic Holdings Corporation)
• Inventors: McCune, Earl W. Jr.
• Granted Patent: US 6,850,736 B2
• Time in Patent Office: Days
• US Class Current: 455/67.11
• CPC Class Codes: H04B 17/23 Indication means, e.g. displays, alarms, audible means
• CPC Class Codes: H04B 17/318 Received signal strength
• CPC Class Codes: H04W 24/00 Supervisory, monitoring or testing arrangements

Abstract

An apparatus (135), method and computer program are provided for determining and indicating a quality of a signal received by a first wireless communication device (105) from a second wireless communication device (110). In one embodiment, the apparatus (135) includes a bit-error-rate (BER) circuit (215) for measuring a BER of the signal, a comparator (145) for comparing the BER with a predetermined value to determine a relative signal quality, and an indicator (160) for indicating the quality of the signal to a user of the first device (105). Alternatively, the apparatus (135) includes a circuit for measuring the strength of the signal (230), a calculator (235) for calculating a signal-to-noise ratio (SNR) of the signal using the strength of the signal and a predetermined noise value, and a comparator (145) for comparing the SNR with a predetermined value to determine a relative signal quality. Signal quality is indicated by activating a number of characters (210) corresponding to the relative signal quality.

Claims

1. A received signal quality indicator (RSQI) apparatus for determining a quality of a signal received by a first wireless communication device from a second wireless communication device, the signal comprising a number of bytes each having at least one bit, the RSQI apparatus comprising:

a bit-error-rate circuit to measure a bit-error-rate of the signal;

a comparator to compare the bit-error-rate of the signal to a predetermined value to determine a quality of the signal relative to the predetermined value; and

an indicator to indicate to a user of the first wireless communication device the quality of the signal.

5. A received signal quality indicator (RSQI) apparatus for determining a quality of a signal received by a first wireless communication device from a second wireless communication device, the RSQI apparatus comprising:

a signal strength circuit to measure a strength of the signal;

a calculator to calculate a signal-to-noise ratio of the signal using the strength of the signal and a predetermined noise value;

a comparator to compare the signal-to-noise ratio of the signal to a predetermined value to determine a quality of the signal relative to the predetermined value; and

an indicator to indicate to a user of the first wireless communication device the quality of the signal.

6. An RSQI apparatus according to claim 5, wherein the predetermined value comprises a predetermined relative signal quality measure, and wherein the comparator is configured to divide the signal-to-noise ratio of the signal by the predetermined signal-to-noise ratio.

7. An RSQI apparatus according to claim 5, wherein the predetermined value comprises a plurality of predetermined values in a look-up table in a memory in the first wireless communication device, and wherein the comparator is configured to compare the signal-to-noise ratio of the signal to the plurality of predetermined values in the look-up table.

8. A method for indicating received signal quality in a first wireless communication device, the method comprising the steps of:

receiving in the first wireless communication device a signal from a second wireless communication device;

determining a quality of the signal relative to a predetermined value; and

indicating to a user of the first wireless communication device the quality of the signal.

2. An RSQI apparatus according to claim 1, wherein the predetermined value comprises a predetermined relative signal quality measure, and wherein the comparator is configured to divide the predetermined bit-error-rate by the bit-error-rate of the signal.

3. An RSQI apparatus according to claim 1, wherein the predetermined value comprises a plurality of predetermined values in a look-up table in a memory in the first wireless communication device, and wherein the comparator is configured to compare the bit-error-rate of the signal to the plurality of predetermined values in the look-up table.

4. An RSQI apparatus according to claim 1, wherein the signal comprises an area identifier, and wherein the bit-error-rate circuit is configured to measure the bit-error-rate in the area identifier as received in the first wireless communication device,

whereby the quality of the signal is indicated to the user before the user initiates communication between the first wireless communication device and the second wireless communication device.

9. A method according to claim 8, wherein the signal comprises a number of bytes each having at least one bit, and wherein the step of determining a quality of the signal comprises the steps of:

measuring a bit-error-rate of the signal; and

comparing the bit-error-rate to the predetermined value.

10. A method according to claim 9, wherein the predetermined value comprises a relative signal quality measure, and wherein the step of comparing the bit-error-rate of the signal to the predetermined value comprises the step of dividing the predetermined bit-error-rate by the bit-error-rate of the signal.

11. A method according to claim 9, wherein the predetermined value comprises a plurality of predetermined values in a look-up table in a memory, and wherein the step of comparing the bit-error-rate of the signal to the predetermined value comprises the step of comparing the bit-error-rate of the signal to the look-up table to determine the quality of the signal.

12. A method according to claim 8, wherein the step of determining a quality of the signal comprises the step of measuring a signal-to-noise ratio of the signal by:

measuring a strength of the signal;

calculating the signal-to-noise ratio of the signal using the strength of the signal and a predetermined noise value.

14. A wireless communication system according to claim 13, wherein the signal comprises a number of bytes each having at least one bit, and wherein the means for determining a quality of a signal comprises means for measuring a bit-error-rate of the signal to determine a bit-error-rate of the signal.

15. A wireless communication system according to claim 14, wherein the predetermined value comprises a plurality of predetermined values in a look-up table in a memory in the first wireless communication device, and wherein the means for determining a quality of a signal comprises means for comparing the bit-error-rate of the signal to the look-up table to determine the quality of the signal.

16. A wireless communication system according to claim 13, wherein the means for determining a quality of a signal comprises means for measuring a signal-to-noise ratio of the signal.

17. A wireless communication system according to claim 16, wherein the means for measuring a signal-to-noise ratio of the signal comprises a predetermined noise value and a means for measuring strength of the signal.

18. A wireless communication system according to claim 16, wherein the predetermined value comprises a predetermined signal-to-noise ratio, and wherein the means for determining a quality of a signal further comprises means for comparing the signal-to-noise ratio of the signal to the predetermined signal-to-noise ratio.

20. A computer program according to claim 19, wherein the signal comprises a number of bytes each having at least one bit, and wherein the quality determination module comprises program code for:

measuring a bit-error-rate of the signal; and

comparing the bit-error-rate of the signal to the predetermined value.

21. A computer program according to claim 20, wherein the predetermined value comprises a predetermined bit-error-rate, and wherein the program code for comparing the bit-error-rate of the signal to the predetermined value comprises program code for dividing the predetermined bit-error-rate by the bit-error-rate of the signal.

22. A computer program according to claim 21, wherein the first wireless communication device comprises a display having a plurality of display characters, and wherein the indication module comprises program code for activating a number of the plurality of display characters corresponding to a result of the predetermined bit-error-rate divided by the bit-error-rate of the signal.

23. A computer program according to claim 19, wherein the quality determination module comprises program code for measuring a signal-to-noise ratio of the signal by:

measuring strength of the signal; and

calculating the signal-to-noise ratio of the signal using the strength of the signal and a predetermined noise value.

13. A wireless communication system comprising:

a first wireless communication device;

a second wireless communication device;

means for determining a quality of a signal received by the first wireless communication device from the second wireless communication device relative to a predetermined value; and

means for indicating to a user of the first wireless communication device the quality of the signal.

19. A computer program for determining a quality of a signal received by a first wireless communication device from a second wireless communication device, the computer program comprising:

a quality determination module for determining a quality of the signal relative to a predetermined value; and

an indication module for indicating to a user of the first wireless communication device the quality of the signal.

19-1. A method of providing link classification information t oa user of a commmunications apparatus communicating across a communications link, the method comprising:

obtaining a measure indicative of link performance;

mapping the measure of link performance to link classification information according to a non-linear relationship; and

displaying the link classification information;

20-2. The method of claim claim 19, wherein said measure is based on bit-error rate.

21-3. The method of claim 20, wherein said measure is based on corrected bit-error rate.

22-4. The method of claim 19, wherein said measure is based on signal-to-noise ratio.