Method and apparatus for adaptive multi-stage multi-threshold detection of paging indicators in wireless communication systems
First Claim
1. A method for detecting paging indicators through a paging channel for removing a mobile terminal from an idle mode in a wireless communication system, the method comprising:
- receiving a first paging indicator (I1);
determining whether a first indicator measurement (x1) corresponding to the first paging indicator is between a first and a second thresholds (t1 and t2 respectively) wherein t1 indicates a boundary for tolerating a miss call and t2 indicates a boundary for tolerating a false alarm;
receiving a second paging indicator (I2) which is a temporal diversity counterpart of the first paging indicator; and
comparing a second indicator measurement (x3) derived based on both the first and second paging indicators against a third threshold (t3),wherein the mobile terminal is removed from the idle mode when x1 is between t1 and t2, and x3 is larger than t3,wherein t1 and t2 are derived based on signal-to-noise ratios (SNRs) corresponding to the first and second paging indicators respectively, and t3 is derived based on SNR corresponding to both the first and second paging indicators,wherein the indicator measurements and the SNR based thresholds are adaptive to variations of channel conditions and predetermined configurations of the paging channel.
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Abstract
A method and system is disclosed for detecting paging indicators using a multi-stage and multi-threshold detection mechanism so that a mobile terminal can be removed from an idle mode appropriately. After receiving a first paging indicator, it is determined whether a first indicator measurement corresponding to the first paging indicator is between a first and a second predetermined thresholds. After receiving a second paging indicator which may be a temporal diversity counterpart of the first paging indicator, a second indicator measurement derived based on both the first and second paging indicators is compared against a third predetermined threshold, wherein the mobile terminal is removed from the idle mode when both comparisons are appropriately conducted.
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Citations
47 Claims
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1. A method for detecting paging indicators through a paging channel for removing a mobile terminal from an idle mode in a wireless communication system, the method comprising:
receiving a first paging indicator (I1); determining whether a first indicator measurement (x1) corresponding to the first paging indicator is between a first and a second thresholds (t1 and t2 respectively) wherein t1 indicates a boundary for tolerating a miss call and t2 indicates a boundary for tolerating a false alarm; receiving a second paging indicator (I2) which is a temporal diversity counterpart of the first paging indicator; and comparing a second indicator measurement (x3) derived based on both the first and second paging indicators against a third threshold (t3), wherein the mobile terminal is removed from the idle mode when x1 is between t1 and t2, and x3 is larger than t3, wherein t1 and t2 are derived based on signal-to-noise ratios (SNRs) corresponding to the first and second paging indicators respectively, and t3 is derived based on SNR corresponding to both the first and second paging indicators, wherein the indicator measurements and the SNR based thresholds are adaptive to variations of channel conditions and predetermined configurations of the paging channel. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A method of 16, wherein the total received input power spectral density including both signal and interference is a combination of the post-channel transmitted power spectral density and the power spectral density of a band-limited white noise and interference from other cells.
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18. A method for detecting paging indicators for removing a mobile terminal from an idle mode in a CDMA wireless communication system, the method comprising:
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receiving a first paging indicator (I1); comparing a first indicator signal-to-noise strength (SNR1) corresponding to the first paging indicator (I1) against a first low threshold (T1) to eliminate the unreliable first paging indicator if SNR1 is less than T1; determining whether a first indicator measurement (x1) corresponding to the first paging indicator is between a first and a second thresholds (t1 and t2 respectively) wherein t1 indicates a boundary for tolerating a miss call and t2 indicates a boundary for tolerating a false alarm; receiving a second paging indicator (I2) which is temporal diversity counterpart of the first paging indicator; comparing a second indicator signal-to-noise strength (SNR2) corresponding to the second paging indicator (I2) against a second low threshold (T2) to eliminate unreliable second paging indicator if SNR2 is less than T2; and comparing a second indicator measurement (x3) derived based on both the first and second paging indicators against a third threshold (t3), wherein the mobile terminal is removed from the idle mode when x1 is between t1 and t2, and x3 is larger than t3, wherein t1 and t2 are functions of signal-to-noise ratios (SNRs) corresponding to the first and second paging indicators respectively, and t3 is derived based on both SNRs, wherein the indicator measurements and the SNR based thresholds are adaptive to variations of channel conditions and predetermined channel configurations. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
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29. A method of 28, wherein the total received input power spectral density including both signal and interference is a combination of the post-channel transmitted power spectral density and the power spectral density of a band-limited white noise and interference from other cells.
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30. A method of 18, wherein the thresholds are expressed under Rayleigh flat fading condition as:
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31. A method of 30, wherein the threshold is further expressed under Rayleigh flat fading condition as:
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32. A system for detecting paging indicators through a paging channel for removing a mobile terminal from an idle mode in a wireless communication system, the system comprising:
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a receiver for receiving a first paging indicator (I1) and a second paging indicator (I2) which is a temporal diversity counterpart of the first paging indicator; a measurement metrics generator for calculating indicator measurements corresponding to the first and second paging indicators; a thresholds generator for generating one or more predetermined thresholds corresponding to miss calls and false alarm; a first stage unit for determining whether a first indicator measurement (x1) is between a first and a second thresholds (t1 and t2 respectively) wherein t1 indicates a boundary for tolerating a miss call and t2 indicates a boundary for tolerating a false alarm; a signal-to-noise ratio (SNR) calculator for calculating signal-to-noise ratios corresponding to the paging indicators; and a second stage unit for comparing a second indicator measurement (x3) derived based on both the first and second paging indicators against a third threshold (t3), wherein the mobile terminal is removed from the idle mode when x1 is between t1 and t2, and x3 is larger than t3, wherein t1 and t2 are derived based on signal-to-noise ratios of the first and second paging indicators respectively, and t3 is derived based on SNR of both the first and second paging indicators. - View Dependent Claims (33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46)
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47. A system of 46, wherein the total received input power spectral density including both signal and interference is a combination of the post-channel transmitted power spectral density and the power spectral density of a band-limited white noise and interference from other cells.
Specification