Time adaptive re-detection mode segmented search call

 

The invention relates to radio communications. The claimed method and circuit for adaptively determining the time of re-detection of the pilot signal. The search subsystem device performs measurement of the phase of the pilot signal. The control processor performs the measurement of the phase shift of the pilot signal, compares the measured value with a threshold value shift and reduces the time of re-discovery, if the measured value exceeds the threshold value shift. The control processor may also be compared to the time re detection with minimal time re detection, and reduces the time of re-discovery only if the time of re-discovery exceeds the minimum time of re-discovery. Additionally, the control processor can increase the time of re-discovery to a maximum time of re-discovery, if the measured value exceeds the threshold shift. The technical result is to create a circuit and method for adaptively determining the time required for implementation of the re-detection of the pilot signal in the segmented mode of the search call. 2 S. and 6 C.p. f-crystals, 2 is sabreena relates to a new and improved method and apparatus for adaptively determining the time necessary for the implementation of the re-detection of the pilot signal in the segmented mode of the search call.

In many radio communication systems, the mobile receiver is only sporadically active. For example, in the communication system using a segmented search call, the base station transmits a channel search call, which is divided by time on a repetitive cycle of time intervals. Each mobile receiver associated with the base station, usually monitors only one time interval in each cycle of time intervals. In continuation of the Unallocated time slots mobile receiver remains in standby state, in which the base station does not transmit any messages to the mobile receiver, but may send messages to other mobile receivers in the time allocated appropriate time intervals. In idle state, the mobile receiver may perform any action that does not require coordination with the base station. Usually most of the time out during the Unallocated time slots mobile receiver uses to reduce power consumption by disabling Pete the gas station.

This mode with reduced power consumption in the technique is often referred to as the inactive mode (sleep mode). Usually the mobile receiver switches to the active mode from the inactive mode at some point of time prior to the selected mobile receiver time interval, re-detects the pilot signal of the base station to restore synchronization of its own formation timestamp with the formation of the timestamp base station and can perform any other action necessary to prepare for the reception of the message at the beginning of the next allocated time frame. An example of a radio communication system that operates according to the above principles described in U.S. patent No. 5392287 called "apparatus and method for reducing power consumption in the receiver mobile communication".

In a dynamic environment, in which the mobile receiver moves relative to the base station, the time of receipt of the pilot signal at the mobile receiver may change quickly. Especially this creates problems in the communication system, multiple access, code-division multiplexing (mdcr), the type of system described in U.S. patent No. 4901307, nazivaemoye or terrestrial repeaters.

In the system mdcr, similar to the system described in the aforementioned patent, the shift in time of receipt at the mobile receiver, pilot signal leads to a change in the location of the pilot signal in the expansion pseudocoelom (PI) code relative to the mobile receiver. The longer the mobile receiver is in an idle mode during the move, the higher the probability that the actual time of receipt of the pilot signal may differ from the expected time of receipt of the pilot signal measured internal free-running timer located inside the mobile receiver. Thus, in the system mdcr similar to the system mentioned above, received by the mobile receiver the actual pilot signal can be shifted by one or more elements of the PN code at a time until the mobile receiver is in an idle state (i.e. does not compress the pilot signal), which leads to a lengthier procedure of re-discovery, because, when a mobile receiver will be released from the inactive state to re-detect the pilot signal, the actual time of receipt of the pilot signal will not match with the expected time of arrival of the pilot signal.

In this DIN the Ala should be long enough to allow the mobile receiver to re-detect the pilot signal, which may significantly shifted in time. In U.S. patent No. 5392287 mentioned above, the mobile receiver moves into the active state for a short, but a fixed time before the advent of the next selected time interval. This time the technique is usually calledby the time of re-discovery. It has been experimentally determined that the fixed time re detection is approximately 80 MS. Mobile receiver performs re-detection of the pilot signal to reconcile its internal formation timestamp with the formation of the timestamp base station during the time of re-discovery before the selected time interval. A possible way of re-discovery is described in pending simultaneous consideration of patent application U.S. No. 08/696769, registered on August 14, 1996, which is called "System and method for rapid re-admission channel pilot signal.

In the above-mentioned patent application, the time required for successful re-admission channel pilot signal, in grabanica, shifted from the expected time of receipt of the pilot signal. Thus, the longer the time shift of the actual pilot signal, the more time will be required for re-admission. As a result, if you are using a fixed time of the active state before the advent of the next selected time interval, it should be long enough to provide a "worst case" shift in the received pilot signal during the time between the occurrence of the mobile receiver in the inactive mode and its transition into the active state. In other words, if the mobile receiver before the selected time interval has not yet made a re-reception of the pilot signal, it may miss part of the message or the whole message being transmitted to the base station during this time interval. If, however, the mobile receiver is relatively stationary, then the actual time of receipt of the pilot signal will be very close to the expected time of receipt of the pilot signal. In this case, successful re-discovery will happen much sooner than will start the selected time interval, and the mobile receiver is justwait

You want a mobile receiver that goes into the active mode from the inactive mode at the appropriate time, to successfully complete the re-reception of the pilot signal, without spending extra time waiting for the beginning of the next selected time interval. Moreover, the mobile receiver must ensure successful re-reception of the pilot signal in a stationary environment, as effectively as in a rapidly changing dynamic environment. In other words, you want a mobile receiver that adaptively determines the time required to complete the re-detection of the pilot signal in the segmented mode of the search call, ensuring no waste of battery power as well as loss of incoming messages search call.

The invention relates to a new and improved method and circuit for adaptively determining the time required for implementation of the re-detection of the pilot signal in the segmented mode of the search call. The method consists in the fact that reduce the time of re-discovery if the measured value does not exceed the threshold shift. Additionally compare time re detection with minimal time re detection, and reduce the time of re-discovery only if the time of re-discovery is greater than the minimum time of re-discovery. Additionally increase the time of re-discovery to a maximum time of re-discovery, if the measured value exceeds the threshold value shift. Next, the mobile receiver is in the idle mode until the time of re-discovery before the next selected time interval of the search call.

The invention also relates to a scheme for adaptively determining the time of re-detection of the pilot signal. The schema contains the search subsystem device for measuring the phase of the pilot signal and the control processor. The control processor measures the amount of phase shift of the pilot signal, compares the measured value with a threshold value shift and reduces the time of re-discovery, if the measured value exceeds the threshold value shift. The control processor may also compare time again the only discovery in the case, if the time of re-discovery is greater than the minimum time of re-discovery. Additionally, the control processor can increase the time of re-discovery to a maximum time of re-discovery, if the measured value exceeds the threshold value shift.

The features, objectives and advantages of the invention will become clearer from the detailed description below and accompanied by drawings that use continuous numbering: Fig.1 illustrates the functional diagram of the circuit provided by the invention, and Fig.2 illustrates a block diagram of a method provided by the invention.

Fig.1 illustrates a mobile receiver 2 according to the invention. The signals received by the antenna 50 of the mobile receiver 2, is transmitted to the receiver (PRMN) 54, which performs amplification, conversion with decreasing frequency and filtering the received signal and transmits it to the device 58 compression pilot signals in the subsystem 55 search device. Additionally, the received signal is transmitted to a demodulator 64A-64N channel search call. The demodulators 64A-64N channel search call or a subset of them independently perform demodulation of different signals mnogoluchevogo call is transmitted to a multiplexer 66, which combines the demodulated data of multipath propagation, which, in turn, provide improved assessment of the submitted data.

Each of the demodulators 64A-64N in the technique of receivers mdcr is often referred to as one of the "fingers" of the rake receiver type. It should be noted that the device 58 compression pilot signals may also contain more than one compression element, orfingerfor independent compression of more than one component of the multipath propagation of the received pilot signal. In fact, the device 58 compression pilot signals functionally may be similar to and interchangeable with demodulators 64A-64N channel search call. In other words, the device 58 compression pilot signals and a demodulator 64A-64N channel search call can be interchangeable by means of demodulation that can be used for demodulation of the various components of multipath propagation of any transmitted from the base station signals (not shown). However, for clarity and simplicity, the compression device pilot signals shown in Fig.1 as a monoblock and separately from the demodulators 64A-64N channel search call.

In order to properly done by the shape information generation timestamp. For this purpose, the processor 62 control passes parameters rediscovery to the processor 56 of the search. The CPU 62 controls, as is well known in the prior art, may be a standard microprocessor. In a possible embodiment, the communication system mdcr, the CPU 62 controls provides information PN-offset, the processor 56 of the search in accordance with the pilot signal, a second detection which should be implemented. The processor 56 of the search generates a PN sequence, which is used by the device 58 compression pilot signals to compress the received signal. Compressed pilot signal is transmitted to running the adder (SUM) 60 energy, which measures the capacity of the compressed pilot signal, accumulating energy during specified periods of time, as known from the prior art, and as further described in pending simultaneous consideration of patent application U.S. No. 08/509721 registered on July 31, 1995, titled "Method and apparatus for search and discovery in the communication system MTCR".

The measured power value of the pilot signals are transmitted to the CPU 62 controls. The CPU 62 controls the digital filter (not shown) performs tsiavou filtering of the power values of the pilot signals according to the mode described in in the process of simultaneous consideration of the patent application U.S. No. 08/872328, registered June 10, 1997, which is called "detection Filter, pilot signal device for radio communication, the applicant Robin D. Judges. In the above-mentioned patent describes a parallel digital filter, and the first branch of the parallel digital filter is used to calculate the time-varying weighted average of the level of the pilot signal in response to the power value of the pilot signal and the second branch of the parallel digital filter is designed to test the power values of the pilot signals in the device, move the device proportional to the value of the power values of the pilot signals. It should be noted that in the technique known other methods of filtration power values of the pilot signals, which are easily adapted for use according to the invention.

In addition to checking the power of the pilot signal processor 62 management also monitors PSH-phase pilot signal over the time. The processor 62 of the control tracks the shift in PSH-phase by maintaining the current PSH-phase pilot signal in the memory 70. Thus when moving the mobile receiver 2 on okretnost the s transmission. As will be described in detail below, the processor 62 controls provides the calculation of "move" or change in the PN phase of the pilot signal after specified time intervals, comparing the stored PSH-phase with the current.

If implemented, the receiving and compressing the pilot signal, the mobile receiver 2 can synchronize the internal timer 72 timer base station (not shown). Then the mobile receiver 2 can carry out demodulation allocated channel search call using the demodulators 64A-64N channel search call. Messages transmitted from the base station to the mobile receiver 2 channel search call can include a message to alert the mobile receiver 2 that there is an incoming call (i.e. the message retrieval call), and messages intended for periodic changes of system parameters in a mobile receiver 2 (i.e. messages with additional service information). The list of possible messages, which are available in the standard channel search call of the time, SU-95, the telecommunications industry Association (ATI)/electronic industry Association (AEP), called "Standard compatible with the essential spectrum", section 7.7.2.1. Each is described in this section of the message may contain a field that indicates, we expect that the appearance of another message. If pending receipt of additional messages, the mobile receiver 2 remains in the active mode to receive additional messages. If no additional messages, the receiver may, by a partial turn off the power immediately enter into a dormant mode until the transition to the active mode for re-admission the pilot channel.

The processor 62 also receives the input information of the timer from the timer 72. The timer 72 is switched on while the mobile receiver 2 is in an idle mode. Among other functions, the timer 72 provides for the measurement of time inactive period to other components of the mobile receiver 2 at the right time could be enabled to support synchronization channel search call and for monitoring personal challenges over the next selected time interval. As mentioned above, the transition time to active state in the worst case is approximately 80 MS. However, as will be described below, according to the invention, the processor 62 controls the risk of the call. As is known in the art, the timer 72 typically includes a reference frequency oscillator, for example, voltage controlled controlled temperature crystal oscillator (OUTCH), or another crystal reference frequency oscillator. As is known in the technique of measurement of time, the timer 72 further comprises a counter and logic control.

When the CPU 62 controls during allocated to a mobile receiver time interval receives a message that indicates that the receipt of additional messages is not expected, it stores the most recent value of PN-phases: the pilot signal in the memory 70. The processor 62 also stores a chronological list of the last N values PSH-phase pilot signal in the memory 70. To determine the magnitude of any shift in the value PSH-phase pilot signal for the last period of the active mode, the processor 62 of the control compares the current value PSH-phase pilot signal with at least the most recent value PSH-phase pilot signal stored in the memory 70. Or the CPU 62 controls to determine the magnitude of any shift in the value PSH-phase pilot signal over the last N periods of the active mode can also compare the current value

The number N is preferably chosen large enough to ensure the reliability of the trends move (or not move) PSH-phase pilot signal. In a preferred embodiment, N is determined in accordance with the period of the active mode. For example, if the period between successive periods of active mode is for the duration of about 2.5 with (i.e., the period between successive selected time intervals of 2.5 s), then N can be chosen equal to 3 in order to measure the movement or lack of movement PSH-phase pilot signal for about the last 1.5 C. To ensure an acceptable level of reliability of any trends in the development of N can also be selected empirically.

The processor 62 of the control compares the measured shift PSH-phase pilot signal for the last period of the active mode with a threshold value, So When you are accepted components of multipath pilot signal, the CPU 62 controls may decide to compare the measured shift in the component of multipath propagation, which came before all. In a preferred embodiment, osushestvlenie selected time interval, sets the shift T MS in the current phase of the pilot signal. In a possible embodiment, the system mdcr, in which one element of the PN-code is approximately 1 MS in duration, T is preferably chosen equal to 5-8 MS. Threshold shift, T, can also be selected experimentally by measuring the time required by the mobile receiver 2 for re-admission the pilot signal with a given shift T MS PSH-phase pilot signal. The choice of T can also be carried out in accordance with whether or not to re-allocate one of the "fingers" of the device 58 compression pilot signals.

If the measured offset in PSH-phase pilot signal during the last period of active status or in the last N periods of the active state is less than the threshold offset value T, it indicates that the transmission medium of a mobile receiver 2 is somewhat static. In this case, the CPU 62 controls reduces the time of re-discovery (i.e., the amount of time the active mode before the next selected time interval) for X MS, because a longer time re detection is not required. For example, if the previous time of re-discovery was the maximum time will be R = MAX X MS. In other words, if the last N periods of active GLP-phase pilot signal did not change significantly, while the mobile receiver 2 is preferably stationary, and the CPU 62 controls reduces the time of re-discovery prior to the beginning of the next selected time interval to allow the mobile receiver 2 to stay longer in the inactive mode, thus saving energy and prolonging battery life. Reducing the time of re-discovery continues iteratively on each interval of the active mode until the time of re-discovery reaches a minimum of R = MS MIN. In a preferred embodiment, the value X is chosen according to the probability of a successful re-detect the pilot signal for the new time of re-discovery, R X, set shift PSH-phase pilot signal in T milliseconds. For example, the value of MAX can be approximately 80 MS, and the value of X is approximately 10 MS. Also, the MIN value is selected in accordance with the probability of a successful re-detect the pilot signal for R = MIN MS, sets the shift PSH-phase pilot signal in T milliseconds. Specialists in this field of technology is the MAX X and MIN can be determined by experiment.

the first receiver 2 is dynamically changing the transmission medium, and so the processor 62 controls increases the time of re-discovery. This increase can occur by successive operations in accordance with the shift value. For example, the shift in T+1 MS can be compensated by adding Y MS back to the time of re-discovery, the R-Value increases, Y, can be defined like the amount by which shrinks, X, or can be determined empirically. This increase in time re-discovery may continue iteratively on each interval of the active mode until the moment when the time of re-discovery, R, again becomes equal to the MACH MC. Or, the CPU 62 controls can immediately restore the time of re-discovery R = MAX MS, if the shift value PSH-phase pilot signal is greater than T milliseconds. If you are using a serial operation in contrast to the instant maximization of time re detection, the mobile receiver 2 will save more energy, but at the expense of a slower response to rapid changes in the environment and, thus, possible loss of an incoming message. Thus, in the preferred embodiment, if the led is I re-discovery R = MAX MS.

In Fig.2 shows the method used according to the invention. The process begins at block 200 with the initial setting time of re-discovery, R, is the MAX. In block 202, the mobile receiver 2 again receives the pilot signal, thereby calculating the current shift PSH-phase. In block 203, the CPU 62 controls saves shift PSH-phase in the memory 70. In block 204, the processor 62 of the control measures, as described above, the shift PSH-phase, thereby calculating the offset from the previously saved changes PSH-phase. Then, in block 205, the mobile receiver 2 monitors the allocated time interval of the search call. As determined in block 206 solutions, as long as there are messages intended for the mobile receiver 2, the flow is expected, the mobile receiver 2 remains active, and in block 205 continues to monitor the selected time interval of the search call.

If the channel search call no incoming messages destined to the mobile receiver 2, the process continues at block 210 solutions. In decision block 210, if the CPU 62 management determines that measured in block 204 shift PSH-phase exceeds a desired threshold value is supplied in block 218, in which the mobile receiver 2 is in the inactive mode until time for R MS before the next selected time interval.

However, if the CPU 62 controls in decision block 210 determines that the measured shift PSH-phase does not exceed a desired threshold offset value T, the process continues at block 214 solutions in which there is a determination of whether R the minimum time of re-discovery, MIN. If not, then R does not change (R = MIN) and the process continues in block 218, in which the mobile receiver 2 is in the inactive mode until time for R MS before the next selected time interval.

On the other hand, if the CPU 62 of the control unit 214 solutions determines that the current time of re-discovery, R, exceeds the minimum time of re-discovery, MIN, then the process continues at block 216, in which the time of re-discovery, R, is reduced by X MS, as described above under Fig.1. The process again proceeds to block 218 in which the mobile receiver 2 is in the inactive mode until time for R MS before the next selected time interval. After an inactive period in block 218, the mobile receiver 2 goes into active mode and summarily receiver 2 is transferred from the inactive mode to the active mode just in time, suitable for successful re-receiving the pilot signal, without spending extra time waiting to start the next selected time interval. The mobile receiver 2 performs this by adaptively determining the time of re-discovery before the next selected time interval relative to the measured shift in the PN phase of the pilot signal. In the mobile receiver 2 provides successful re-reception of the pilot signal in a stationary environment as well as in a rapidly changing dynamic environment, with no loss of battery power, and loss of incoming messages search call.

The preceding description of the preferred variant of the invention provides the opportunity for professionals in this field of technology to learn how to make or use the invention. Various modifications to the options for implementation will be obvious to a person skilled in the art and the General principles defined herein may be applied to other variants of implementation without the use of inventive abilities. Thus, the invention is not limited to the variants of the implementation discussed here, and offered what style="text-align:center; margin-top:2mm;">Claims

1. Method of adaptive determine the time of re-detection of the pilot signal, namely, that measure the magnitude of the phase shift of the pilot signal by comparing the current value psevdochumoy (PSH)-phase pilot signal at least with the last stored value PSH-phase pilot signal, comparing the measured value with a threshold value shift and reduce the time of re-discovery, if the measured value exceeds the threshold value shift.

2. The method according to p. 1, wherein comparing the time of re-discovery with a minimum of time re detection and reduce the time of re-discovery only if the time of re-discovery exceeds the minimum time of re-discovery.

3. The method according to p. 2, characterized in that it further increases the time of re-discovery to a maximum time of re-discovery, if the measured value exceeds the threshold value shift.

4. The method according to p. 3, characterized in that it consists in an inactive mode until the time of re-discovery before the next assigned time interval of the search call.

5. System for adaptive phase measurement pilot signal and the control processor for measuring the phase shift of the pilot signal by comparing the current value PSH-phase pilot signal at least with the last stored value PSH-phase pilot signal, when the control processor compares the measured value with a threshold value shift, and reduces the time of re-discovery, if the measured value exceeds the threshold value shift.

6. The system under item 5, characterized in that the control processor compares a time of re-discovery with a minimum of time re detection and reduces the time of re-discovery only if the time of re-discovery is greater than the minimum time of re-discovery.

7. The system under item 6, characterized in that the control processor increases the time of re-discovery to a maximum time of re-discovery, if the measured value exceeds the threshold value shift.

8. The system under item 7, characterized in that it is in the inactive mode until the time of re-discovery before the next selected time interval of the search call.

 

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EFFECT: enhanced noise immunity under structural noise impact.

1 cl, 3 dwg

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