CN101150828A - Quick paging channel detection with signal to noise ratio dependent thresholds - Google Patents
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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.
Description
Technical Field
The present invention relates generally to wireless communication systems, and more particularly to a method and system for detecting the presence of switch signaling in a wireless communication network.
Background
The Quick Paging Channel (QPCH) is an uncoded channel used in CDMA (code division multiple access) based telecommunication systems for carrying switch signaling. This channel carries a variety of indicators such as a paging indicator, a broadcast indicator, and a configuration change indicator. The following discussion will use a specific indicator like the paging indicator as an example, but it should be understood that anything that can be applied to the paging indicator can also be applied to other indicators of QPCH transmissions.
In a wireless communication network, a mobile terminal remains in an idle state to conserve battery power when there is neither a voice nor a data call. In the idle state, the mobile terminal is awakened periodically at intervals, typically on the order of milliseconds, and monitors the paging indicator to detect the presence of a page made to the mobile terminal. A relatively simple predetermined algorithm is typically used to determine whether the paging indicator indicates that there is an ongoing or imminent voice or data call. If the result of the predetermined algorithm is positive, the mobile terminal is switched on to decode the information transmitted over the common channel, which may contain dedicated or broadcast messages for up to 100ms intervals. If the final determination according to the simple algorithm is negative, the mobile terminal returns to a "sleep mode" during which most of the mobile terminal components are turned off to save battery power while keeping a few critical components on the basic timing requirements. As known to those of ordinary skill in the art, the more frequently a mobile terminal decodes information in a common channel, the more power the mobile terminal must consume. Therefore, there is a need to increase the latency, or amount of time the mobile terminal is in "sleep mode".
To increase latency, a wireless communication system that periodically communicates with a mobile terminal transmits the same paging indicator over timeTimes to indicate whether there is a page to the mobile terminal. For example, 3 rd generation partnership project2 (3) rd Generationpartnership project 2) describes a quick paging channel designed for this purpose in a CDMA2000 environment. For a review of the physical layer standards for CDMA2000spread spectrum systems ("physical layer standard for CDMA2000spread spectrum systems",3GPP2C.S0002, march, 2000). See also the "upper Layer (Layer 3) signaling standard for CDMA2000spread spectrum systems (2000)" ("upper Layer (Layer 3) signaling standard for CDMA2000spread spectrum systems (2000)", 3GPP2℃ S0005, march, 2000). QPCH indicators are typically on/off keyed to reduce transmission power. The paging indicator is used to signal to the mobile terminal the presence of a paging message within a predetermined paging slot in the QPCH. If the paging indicator indicates on, the mobile terminal should be awake and able to receive a page. If the paging indicator indicates off, the mobile terminal may continue in the idle state to conserve power. The indicator is repeatedly transmitted once to obtain time fading diversity information.
To conserve battery power, it is critical to reliably and efficiently detect the presence of a paging indicator. Due to the presence of noise and fading of over-the-air communications, the signal-to-noise ratio (SNR) can become very low, which makes any detection mechanism challenging. There are generally two types of paging related errors. Type I errors, i.e. false alarm errors that may cause false alarms, in turn cause incorrect page detection where more battery power is consumed. Type II errors, i.e. loss errors that miss an incorrect detection of a voice/data call. In wireless communication systems, the detection mechanism has to be designed to minimize false alarms without exponentially increasing the loss rate.
Single-stage detection mechanisms are disclosed in prior art references, in which a threshold is set for a given false alarm and the detection probability is maximized. For more, see "statistical signal processing base: theory of detection ("fundamentalsofStatisticalSignal Processing：Detection Theory”，Prentice Hall PTR，1 st Edtion, march 1993) ". However, since only a single threshold is used while the channel gain ratio is changing, this mechanism cannot be practical to minimize both false alarms and loss rates for multi-level page indicator detection. Other existing methods, while solving some of the problems described above, do not efficiently detect paging indicators in multiple stages.
Existing page detection methods do not take advantage of the known signal-to-noise ratio (SNR) channel to improve detection performance. In fact, most designs are usually proposed to cope with the worst case. If a design keeps the false alarm probability constant over the entire operating range, the loss detection probability will be almost zero at high SNR. Even if the false alarm probability can be reduced to a value lower than the design target with little sacrifice of the probability of lost detection at high SNR, the existing methods cannot use different thresholds to change the detection performance because they use fixed thresholds independent of SNR.
Without an effective detection mechanism, battery power would be consumed more and a high loss rate is inevitable, resulting in poor communication performance. Accordingly, there is a need to improve existing methods of detecting paging indicators.
Disclosure of Invention
In view of the foregoing, the present invention provides a method of detecting a paging indicator in a wireless communication system.
Methods and systems for detecting paging indicators using multi-level and multi-threshold detection mechanisms so that mobile terminals can be properly taken out of idle mode are disclosed. After receiving the first paging indicator, it is determined whether a first indicator metric corresponding to the first paging indicator is between first and second predetermined thresholds. If so, a second indicator metric is derived from the second paging indicator, and the predetermined function of the first and second paging indicator metrics is again compared to a third predetermined threshold, wherein the first and second predetermined thresholds are based on the square root of the signal-to-noise ratio of the first paging indicator, and the third predetermined threshold is based on the square root of the signal-to-noise ratio corresponding to the second paging indicator.
A method of detecting a paging indicator through a paging channel in order to bring a mobile terminal out of an idle mode in a wireless communication system is disclosed. The method includes receiving a first paging indicator I1; determining first and second thresholds T based on signal-to-noise ratio of first paging indicator 1 And T 2 The first and second thresholds are different if the signal-to-noise ratio of the first paging indicator is below a predetermined initial signal-to-noise ratio threshold, otherwise the first and second thresholds are the same; deriving a first paging indicator metric x corresponding to the first paging indicator 1 (ii) a In the first stage according to x 1 Respectively with T 1 And T 2 Determines whether the mobile terminal will leave the idle mode, T 1 Indicating a margin and T for tolerating a lost call 2 Indicating a margin for tolerating false alarms; if it cannot be determined in the first stage whether the mobile terminal is out of idle mode, a second paging indicator metric x is derived from the received second paging indicator I2 2 (ii) a And in the second stage according to a third threshold value T 3 And x 1 And x 2 Determines whether the mobile terminal will leave the idle mode, wherein T 1 And T 2 Is derived from the square root of the signal-to-noise ratio corresponding to the first paging indicator, and T 3 Is derived from the square root of the signal-to-noise ratio corresponding to the second paging indicator.
A system for detecting a paging indicator through a paging channel in order to bring a mobile terminal out of an idle mode in a wireless communication system is disclosed. The system includes a receiver for receiving first and second paging indicators I1 and I2; a threshold generator for determining the first and second threshold T based on the signal-to-noise ratio of the first paging indicator 1 And T 2 If the signal-to-noise ratio of the first paging indicator is lower than the predetermined initial signalA noise ratio threshold, the first and second thresholds being different, otherwise, the first and second thresholds being the same; a processor for deriving a first paging indicator metric (x) corresponding to a first paging indicator 1 ) Or derive a second paging indicator metric x from the received second paging indicator I2 2 (ii) a A comparator for in a first stage according to x 1 Respectively with T 1 And T 2 Determines whether the mobile terminal will leave the idle mode, T 1 Indicating a margin and T for tolerating a lost call 2 Indicating a margin of tolerance to false alarms, and for if in the first placeIn the second stage, according to a third threshold T, it is not possible to determine whether the mobile terminal has left the idle mode or not 3 And x 1 And x 2 Determines whether the mobile terminal will leave the idle mode, wherein T 1 And T 2 Is derived from the square root of the signal-to-noise ratio corresponding to the first paging indicator, and T 3 Is derived from the square root of the signal-to-noise ratio corresponding to the second paging indicator.
The construction and method of operation of the invention, together with further objects and advantages thereof, will be best understood from the following description of specific embodiments when read in connection with the accompanying drawings.
Drawings
FIG. 1 is a graph illustrating the difference in signal-to-noise ratio of a paging indicator based on two target thresholds corresponding to a probability of false alarm and a probability of dropped call in accordance with one embodiment of the present invention;
FIG. 2 is a flow diagram illustrating decisions made for multiple stages of page indicator detection in accordance with one embodiment of the present invention; and
fig. 3 is a hardware diagram for implementing multiple stages of page indicator detection in accordance with one embodiment of the present invention.
Detailed Description
A detailed description of a method and system for determining the presence of an indicator transmitted on a quick paging channel in a wireless communication network will be provided below. The subject matter set forth herein is applicable to wireless communication systems that utilize Time Division Multiplexing (TDM), code Division Multiplexing (CDM), and Frequency Division Multiplexing (FDM) techniques to multiplex signals. For purposes of illustration, a CDMA2000 system is used as an example. In wireless communication systems, such as CDMA2000 systems, several paging indicators are implemented. A paging indicator may be understood by one of ordinary skill in the art as a signal that detects the presence of a paging signal and is broadly defined to include, but is not limited to, the following paging indicator examples. For example, a quick paging channel paging indicator is designed for the Quick Paging Channel (QPCH). Another quick paging channel configuration change indicator is designed for the Common Control Channel (CCCH). Yet another quick paging channel broadcast indicator is designed for the broadcast control channel (BCCCH).
The present invention estimates the SNR of the QPCH and calculates a detection threshold based on the estimated SNR. The operating range of SNR is divided into two ranges: a high SNR range and a low SNR range. For each range, an SNR correlation threshold is used for a different decision mechanism. For example, in the high SNR range, both the target loss detection probability and the target false alarm probability can be satisfied with a single threshold value because of the good signal quality. In fact, the high SNR range enables the detector to satisfy detection performance between the probability of missed detection and the probability of false alarm with a single SNR correlation threshold. More specifically, a double decision mechanism is used in the high SNR range. In the low SNR range, it is not possible to satisfy both the target loss detection probability and the target false alarm probability with a single threshold. Therefore, it is necessary to use two thresholds, which introduces a suspect (erasures) or indeterminate state. When the first paging indicator enters this suspect state, subsequent paging indicators are tested for detection and possibly combined with the first page loss indicator. Therefore, the triple decision mechanism is used in the low SNR range.
In accordance with one embodiment of the present invention, two paging indicators, I1 and I2, are transmitted in each paging slot cycle in a CDMA2000 system, where I2 is the time diversity counterpart of I1. These two indicators span the channel coherence length (approximately 20 ms) to achieve time diversity. Assume that the received symbol signal is expressed as r i，k，l Where I is the paging indicator index (1 or 2 for I1 or I2, respectively), k is the index of the multipath comprising the diversity branches, and 1 is the Quadrature Phase Shift Keying (QPSK) symbol index, where QPSK is understood to be a digital frequency modulation technique for transmitting digital data over a communication channel, the corresponding estimated radio channel information of which is a i，k，l ，a i，k，l Representing the channel conditions. Then, a measurement metric corresponding to the paging indicator bar display section can be obtained by a predetermined combination method. For example, three normalized measurement metrics (or paging indicator metrics) x are combined by a simple pilot-weighted combining method 1 、x 2 And x 3 Expressed as:
(equation 3)
Where K1 and K2 are the number of multipaths (including diversity branches) of I1 and I2, respectively, L is the number of QPSK symbols per paging indicator, QPR is the ratio between the power of the quick paging indicator and the pilot signal, and the channel gain, also referred to as base station notification. In a CDMA2000 system, QPR has QPR =10 (QPCH_POWER_LEVEL_PAGE+3)/20 And QPCH _ POWER _ LEVEL _ PAGE is the PAGE indicator modulation symbol POWER LEVEL relative to the forward pilot channel also defined in the CDMA2000 standard.
It should be understood that the measurementMetrics are derived from the base station signaled channel gains, estimated radioThe channel information is significantly better than the prior art. The above method may be referred to as a pilot weight combining method. With this approach, no noise reduction weights are explicitly specified to solve the noise problem, since the weighting effect has already been achieved. As shown, since x 1 、x 2 And x 3 Are both functions of and normalized to QPR, so there is a built-in inherent adaptation mechanism that can work with any communication system. The summation corresponding to the radio channel information represented by the above equation provides a normalization process so that the analysis can be simplified. It should also be appreciated that the measurement metric need not be normalized, and indeed, QPR may be considered while determining the threshold to which the measurement metric is compared (as will be further described below). By taking both QPR and signal-to-noise ratio (SNR) into account in deriving and analyzing these measurement metrics and their respective thresholds, both channel conditions and channel configuration can be factored in order to make page detection fully adaptable to a wide variety of channel environments.
In another embodiment using the maximal ratio combining method, three similar normalization indicator metrics x are given as follows 1 、x 2 And x 3 ：
Wherein σ i，k，l 2 Is the noise variance of the ith paging indicator, the kth multipath, and the l symbol. In this derivation x 1 、x 2 And x 3 In the method of (3), the noise is expressed by a factor, and the application weight is also appropriately considered. AGenerally speaking, if the noise is higher, the application weight should be lower. As can be seen from the above metric, the noise variance is placed in the denominator part to represent the "inverse" relationship. In this maximum ratio combining method, specific weights are applied as described above to reduce noise interference, thereby improving the performance of the system.
The effective signal-to-noise ratios (SNRs) of the paging indicators I1 and I2 are referred to as SNR1 and SNR2, respectively. SNR3 is defined as the combined SNR of I1 and I2. In a communication system, it will be appreciated by those skilled in the art that the SNR tends to depend on the characteristics of the mobile terminal demodulator, the channel conditions, and the inherent noise. For the present application, since the QPCH power can be known in advance based on the pilot channel power, the SNR can be traded for Eb/Nt, which is the ratio of energy per bit to the effective noise spectral density.
Any decision rule to determine the paging indicator requires some form of SNR estimation. For example, the SNR can be estimated from the pilot signal. Total received power to interference ratio Ec p Io is in decibels (dB), where Ec p And Io is the pilot chip energy and the total received input power spectral density containing both signal and interference, respectively. This ratio can be easily obtained from the mobile terminal searcher. Then, the noise factor expressed by SNR is given by:
SNR＝QPCH_Ec/Ioc＝(QPR) 2 *Ec p io (equation 4)
Wherein Ec p And Ioc is the chip energy of the pilot signal and the power spectral density of the band-limited white noise and interference from other cells including multipath interference. QPCH _ Ec is the total chip energy of the paging indicator. Due to I o ＝I or +I oc For I or ≌I oc Can obtain an approximate formula I oc ≌I o /2, wherein the term I or Is the post-channel transmit power spectral density. In the forward link, I or Is the total transmit power spectral density of the base station under soft handoff. In CDMA2000 system, I or /I oc Called the geometry factor.
Therefore, the SNR approximation of I1 and I2 is as follows:
SNR1＝2R*(QPR) 2 *Ec p1 /I o1 (equation 5)
SNR2＝2R*(QPR) 2 *Ec p2 /I o2 (equation 6)
The SNR approximation formula for the combination of I1 and I2 is as follows:
SNR3＝2R*(QPR) 2 *[Ec p1 /I o1 +Ec p2 /I o2 ](equation 7)
Wherein for a CDMA2000 system, R =256 or 512 for a quick paging channel data rate of 4,800bps or 2,400bps. When the signal is equal to noise plus interference, the approximation error is approximately zero. When the geometric factor (I) or /I oc ) Low (e.g., from-5 dB to 5 dB), which corresponds to a low SNR region and is primarily important for detection and decoding, the estimate is relatively accurate. In the decision rule discussed below, the decision threshold is constant in the high SNR region corresponding to the high geometry factor.
The estimated indicator SNR is compared to an SNR threshold that determines the limit between the high SNR range and the low SNR range. The SNR threshold is an SNR that can be satisfied by both the target false alarm probability and the target loss detection probability in the first indicator detection. Giving false alarm probability (P) F ) And loss detection probability (P) MD ) The SNR threshold value that divides the SNR range into high SNR or low SNR is obtained by solving the following joint equation:
(equation 8)
Where "T" is a threshold and x is an indicator. In general, T may be derived from a predetermined false alarm probability, and the SNR in the above equation may be derived from T and a predetermined loss detection probability. Thus, the threshold is SNR dependent.
FIG. 1 is a graphical representation of a selected region showing a high SNR range in accordance with one example of the present invention. As shown in fig. 1, the SNR-related threshold may be represented as a function of the square root (horizontal axis) of the indicator SNR. If the threshold is represented by a linear function, the selected detection performance can be obtained by adjusting the slope and intercept of the threshold. In the high SNR range, only one detection threshold is required. Threshold (T) satisfying a given false alarm probability f ) Is a constant independent of SNR (as shown by the dashed line) while satisfying a threshold (T) for a given probability of missed detection d ) Is a linear function of the square root of the SNR (as shown by the solid line). The detection threshold in the high SNR range can be seen as exceeding T to the right f And T d At T of the intersection point of f And T d A non-decreasing function of the square root of the SNR in the region in between. For the sake of illustration, this particular region to which any detection threshold of high SNR may coincide is shown shaded.
When in the low SNR range, the detection is a multi-level detection mechanism that detects at least two quick paging indicators in a combined manner. In order to detect the paging indicator according to the SNR, two thresholds T are required 1 And T 2 However, for combined paging indicator based detection, a third threshold T is required 3 。T 1 Indicating a margin of tolerance to lost calls, and T 2 Indicating the limits of tolerance for false alarms. According to an example of the present invention, the detection threshold determination in the low SNR range may be selected as:
T 1 ＝T d
T 2 ＝T f (equation 9)
Where f is a non-decreasing function.
If the threshold value T is set 3 Expressed as a linear function, T can be expressed as 3 Shown as follows:
Wherein, with a 3 And b 3 Precalculated and saved in memory for a given area (E) s /N t ) 1 Is divided into several regions.
FIG. 2 provides a flow diagram 100 illustrating an improved detection process according to one embodiment of the invention. In FIG. 2, x 1 And x 2 Is a first and second indicator detection metric, and x 12 Is a combined indicator metric (x) 12 ＝w1*x 1 +w2*x 2 Where w1 and w2 are optional weights). (E) s /N t ) 1 Is the energy to noise ratio of the first indicator symbol, and (E) s /N t ) 2 Is the energy to noise ratio of the second indicator symbol. SNR _ threshold is the total SNRA threshold value, and T 1 、T 2 And T 3 Are the three thresholds discussed above. a is 1 、a 2 And a 3 Is a constant representing the slope of the linear function, and b 1 、b 2 And b 3 Represents T f And T d The intercept therebetween.
The flowchart 100 begins with the first stage of entering decision step 102. If the total SNR of the QPCH (i.e., QPCH (E) s /N t ) 1 ) Not less than a predetermined threshold SNR threshold, T, based on total SNR, T is calculated 1 And T 2 Is set to the same value and, in step 104, is mathematically determined as:
(equation 11)
On the other hand, if the total SNR of the QPCH (i.e., QPCH (E) s /N t ) 1 ) Less than a predetermined total SNR-based threshold SNR threshold, T is measured in step 106 1 And T 2 Is set to different values and is mathematically determined as:
It can be seen that T, although still based on the first indicator only, is 1 And T 2 Are set to different values based on different weighting constants a and b. With T 1 And T 2 An initial setting is obtained and the process moves to step 108 where the first indicator detection metric x is measured in step 108 1 And T of setting 1 By comparison, if it is less than T 1 The mobile terminal should stay in the idle state (step 110). If the first indicator detection metric x is determined in step 108 1 Greater than T 1 Then the first indicator detection metric x is further determined in step 112 1 Whether or not it is greater than or equal to T 2 . If so, there is a strong indication that the mobile terminal should be turned on in step 114. This means that if the first indicator detects the metric x 1 Greater than T 1 And T 2 Both, false alarms are not possible.
At x 1 At T 1 And T 2 In between, introducing a second indicator detection metric x 2 And (5) further detecting. Second indicator detection metric x 2 Is derived from the second paging indicator I2, which second paging indicator I2 may be a time counterpart of the first paging indicator I1. First a combined threshold value T is derived from the square root of the SNR of the second paging indicator 3 . That is to say that the temperature of the molten steel is,
(equation 13)
Wherein, a 3 And b 3 Are predetermined constants that may be stored in the mobile terminal in advance. Then, x will be followed as its variable in step 116 1 And x 2 Varying selected non-decreasing functions f and T 3 And (6) comparing. If it is determined in step 116 that it is below the threshold T 3 Then, the mobile terminal is turned off. If not, then,the mobile terminal is opened in step 120. To this end, the two-stage indicator detection process is completed.
It should be noted that SNR threshold is an artificial dividing line that cuts the operating range of SNR into a high SNR range and a low SNR range in step 102. As described above, a single threshold is sufficient to satisfy both the target loss detection probability and the target false alarm probability if in the high SNR range. On the other hand, if below the total threshold, it is considered to be in the low SNR range, requiring the application of a triple decision process. Two are providedDifferent threshold values T 1 And T 2 Introduce x 1 Greater than T 1 But less than T 2 The suspected state of (c). At this point it is reasonable to assume that further determinations should be introduced and that the second indicator is used to further decide whether the mobile terminal should be opened, as seen in step 116 above. It should also be noted that T 1 、T 2 And T 3 Some of the values of (c) are based on the square root of the SNR of the respective paging indicator.
Fig. 3 illustrates a hardware diagram 300 containing various components to accomplish paging indicator detection. There is a signal receiver or detector 302 in the mobile terminal that receives the QPCH signal, as well as other signals from other communication channels, such as a pilot channel. At least one comparator module 304 is in the mobile terminal that performs multiple rounds of comparison as described above. An SNR calculator 306 provides an SNR value from the received signal, and a threshold generator 308 performs processing for calculating a required threshold. When the SNR and the threshold value are fed into the comparator from the detection signal, the comparator performs comparison in cooperation with a processing unit such as the microcontroller 310. Based on the comparison result, the controller 310 provides a decision signal for the mobile terminal to wake up or stay in an idle state. It should also be understood that the various calculators and generators can be implemented in hardware or software means. For example, all processing power may be provided by a microprocessor, such as a controller, in the mobile terminal without being broken down into different units. Alternatively, some modules may be implemented by separate hardware modules that operate independently of the controller.
The above illustrations provide many different embodiments or embodiments for implementing different features of the invention. Specific embodiments of these components and processes are described to help clarify the invention. These are, of course, merely embodiments and are not intended to limit the invention from that described in the claims.
Although the invention is illustrated and described herein as embodied in one or more specific examples, it is nevertheless not intended to be limited to the details shown, since various modifications and structural changes may be made therein without departing from the spirit of the invention and within the scope and range of equivalents of the claims. Accordingly, it is appropriate that the appended claims be construed broadly and in a manner consistent with the scope of the invention, as set forth in the following claims.
Claims (10)
1. A method for detecting a paging indicator through a paging channel in order to bring a mobile terminal out of an idle mode in a wireless communication system, the method comprising:
receiving a first paging indicator I1;
determining first and second thresholds T based on signal-to-noise ratio of first paging indicator 1 And T 2 The first and second thresholds are different if the signal-to-noise ratio of the first paging indicator is below a predetermined initial signal-to-noise ratio threshold, otherwise the first and second thresholds are the same;
deriving a first paging indicator metric x corresponding to the first paging indicator 1 ；
In the first stage according to x 1 Respectively with T 1 And T 2 Determines whether the mobile terminal will leave the idle mode, T 1 Indicating the margin and T of a loss tolerant call 2 Representing a margin of tolerance for false alarms;
if it cannot be determined in the first stage whether the mobile terminal is out of idle mode, deriving a second paging indicator I2 based on the received second paging indicatorTwo paging indicator metric x 2 (ii) a And
in the second stage according to a third threshold value T 3 And x 1 And x 2 Determines whether the mobile terminal will leave the idle mode,
wherein, T 1 And T 2 Is derived from the square root of the signal-to-noise ratio corresponding to the first paging indicator, and T3 is derived from the square root of the signal-to-noise ratio corresponding to the second paging indicator.
2. The method of claim 1, wherein the step of determining the first and second thresholds further comprises comparing T to a threshold 1 And T 2 Is defined as
And
wherein, in the step (A),
is the signal-to-noise ratio corresponding to the first paging indicator, and if the signal-to-noise ratio of the first paging indicator is below a predetermined initial SNR threshold, then a 1 、a 2 、b 1 、b 2 Is a predetermined constant.
3. The method of claim 1, wherein the step of determining the first and second thresholds further comprises comparing T to a threshold 1 And T 2 Is defined as
Wherein, in the step (A),
is the signal-to-noise ratio corresponding to the first paging indicator, and if the signal-to-noise ratio of the first paging indicator is above a predetermined initial signal-to-noise ratio threshold, a 12 And b 12 Is a predetermined constant.
4. The method of claim 1, wherein a third threshold T 3 Is determined as
Wherein, in the step (A),
is the signal-to-noise ratio corresponding to the second paging indicator, and a 3 And b 3 Is a predetermined constant.
5. The method of claim 1, wherein the second paging indicator I2 is a time diversity counterpart of the first paging indicator I1.
6. A system for detecting a paging indicator through a paging channel in order to bring a mobile terminal out of an idle mode in a wireless communication system, the system comprising:
a receiver for receiving first and second paging indicators I1 and I2;
a threshold generator for determining the first and second thresholds T based on the signal-to-noise ratio of the first paging indicator 1 And T 2 The first and second thresholds are different if the signal-to-noise ratio of the first paging indicator is below a predetermined initial signal-to-noise ratio threshold, otherwise the first and second thresholds are the same;
a processor for deriving a first paging indicator metric (x) corresponding to a first paging indicator 1 ) Or derive a second paging indicator metric x from the received second paging indicator I2 2 ；
A comparator for in a first stage according to x 1 Respectively with T 1 And T 2 Determines whether the mobile terminal will leave the idle mode, T 1 Indicating the margin and T of a loss tolerant call 2 Indicating a limit for tolerating false alarms and for, in a second stage, depending on a third threshold T, determining if the mobile terminal has left the idle mode if in the first stage it cannot be determined 3 And x 1 And x 2 Determines whether the mobile terminal will leave the idle mode,
wherein, T 1 And T 2 Is derived from the square root of the signal-to-noise ratio corresponding to the first paging indicator, and T3 is derived from the square root of the signal-to-noise ratio corresponding to the second paging indicator.
7. The system of claim 6, wherein the second paging indicator I2 is a time diversity counterpart of the first paging indicator I1.
8. The system of claim 6, wherein the first and second thresholds T 1 And T 2 Is defined as
And
wherein, in the step (A),
is a signal-to-noise ratio corresponding to the first paging indicator, and if the signal-to-noise ratio of the first paging indicator is below a predetermined initial signal-to-noise ratio threshold, a 1 、a 2 、b 1 、b 2 Is a predetermined constant.
9. The system of claim 6, wherein the first and second thresholds T 1 And T 2 Are set to be identical and set to
Wherein, in the process,is the signal-to-noise ratio corresponding to the first paging indicator, and if the signal-to-noise ratio of the first paging indicator is above a predetermined initial signal-to-noise ratio threshold, a 12 And b 12 Is a predetermined constant.
10. The system of claim 6, wherein a third threshold T 3 Is determined as
Wherein, in the step (A),is the signal-to-noise ratio corresponding to the second paging indicator, and a 3 And b 3 Is a predetermined constant.
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| US11/492,742 US7787892B2 (en) | 2005-10-05 | 2006-07-25 | Method and apparatus for adaptive multi-stage multi-threshold detection of paging indicators in wireless communication systems |
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| TW411690B (en) * | 1998-02-20 | 2000-11-11 | Koninkl Philips Electronics Nv | A power consumption reduction method in a digital mobile radio system and a mobile radio station |
| US7787892B2 (en) * | 2005-10-05 | 2010-08-31 | Via Technologies, Inc. | Method and apparatus for adaptive multi-stage multi-threshold detection of paging indicators in wireless communication systems |
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2007
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112614313A (en) * | 2020-11-30 | 2021-04-06 | 国网山东省电力公司滨州供电公司 | Transmission line synthesizes self-defined management alarm terminal |
| CN112614313B (en) * | 2020-11-30 | 2023-02-03 | 国网山东省电力公司滨州供电公司 | Transmission line synthesizes self-defined management alarm terminal |
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