The method of synchronization signals of the base stations in the communication system

 

The invention relates to mobile communications systems and can be used for synchronization of base stations. The technical result is to increase the accuracy of synchronization of base stations a radio communication system in frequency and time. To do this, measure the reciprocal frequency error signal base stations, adjust the base station signal at the signal of the reference base station and minimizes the error estimates associated with noise and system noise. 2 C.p. f-crystals, 3 ill.

The invention relates to the field of radio engineering, in particular to a method of synchronization signals of the base stations in the wireless radio communication system, and can be used in radio systems of the second, third and fourth generations for synchronization of base station signals.

System wireless radio can be built both synchronously and asynchronously. Under the synchronicity radio system here refers to the simultaneous transmission of signals of different base stations in the direct channel. Simultaneous construction of the communication system has a number of advantages, such as simplification of procedures to automatically switch to another base station when the mobile station re Hronom build system wireless radio must perform clock synchronization of all base stations of the system.

You can use for the purpose of synchronization of the base station signal of the signal from the satellite of the GPS system, which is described for example, in the book Century. G kartashevskaya street, S. N. Semenov, I. C. Firstova. A mobile network. M., 2001, S. 59 [1] , or other similar systems. This decision synchronization task requires the composition of each base station device receiving signals from satellites of the GPS system, which increases the value of the base station. In addition, it makes dependent the performance of the communication system from an external system, which may be undesirable.

There are ways offline synchronization in wireless systems. These methods include the method described in WO 99/57826: Mthod of synchronization of a base station network, May 4, 1998, Int. Cl H 04 J 3/06, H 04 b 7/26 [2], which is the closest to the claimed method, the synchronization signals of the base stations in the communication system.

In the prototype [2] considers communication system that includes N base stations, the first base station controllers and the Central location of mobile users.

All base stations of the radio system is proposed to split into groups, for example, so that one group of base stations connected to the x stations in the communication system.

In each group of base stations selects one base station and identifies it as the reference base station of this group of base stations. The feature of the reference base station group is that all base stations of the group correct time reference of the base station of this group.

One reference base station is defined as the reference base station radio system and corresponding group as the reference group of base stations. The feature of the reference group is that all groups of base stations adjust the time reference of the group of base stations.

It is proposed to install the measuring device in such a way that each of the measuring unit performs the measurement of the mutual temporal error signals of at least one pair of base stations, the signal any base station is received at least one measuring device.

The part of the measuring device receives signals from base stations of the same group of base stations, and a part of the measuring device signals of base stations of different groups.

So L measuring device is divided into I+1 group. In the i-th group of measuring devices, where I base station signal of the i-th group. In the I+1-th group measuring device includes a measuring device that measures the mutual time of the error signals of the base stations of different groups.

The timing of the base stations a radio communication system carried out periodically in two stages.

In the first stage, for each group of base stations perform time synchronization within a group of base stations, which perform the following procedure.

Provide measurements of the mutual time difference of signals of the base stations via a measuring device of this group.

Transmit the measured mutual time of the error signals of the base stations to the base station controller of this group.

Each measured mutual temporal misalignment can be presented in the following amounts:TOBS=TBTS+TLOS+TNLOSwhereTOBS- measured mutual temporal mismatch between the signals of base stations,TBTStrue temporary misalignment between the hours of base stations,tion,TNLOS- the difference of times on indirect (reflected) distribution of base station signals to the measuring device.

In this sumTLOSandTNLOSmake a mistake in assessing the value ofTBTS. As the geographical position of the base stations and measuring devices can be measured, then the difference of times to direct the distribution of signals from base stations to the measuring deviceTLOScan be taken into account and the sum takes the formTOBS=TBTS+TNLOS.
In the prototype, a method for reducing errors associated with uncertaintyTNLOSbased on the redundancy of the measurements.

For example, if there is measurementTOBS,1->2,TOBS,1->3andTOBS,3->2,
whereTOBS,1->2- measured temporal mismatch between the signals of the first and second base stations,
TOBS,1->3- measured temporal mismatch between the mismatch between the signals of the third and second base stations, the quality assessment of temporary mismatch between the signals of the first and second base stations should take the minimum value of the two valuesTOBS,1->2andTOBS,1->3+TOBS,3->2. This rule is based on the fact that the error isTNLOStakes only nonnegative values.

In the prototype it is proposed to apply this rule to a set of measurements of the mutual temporal errors of this group of base stations with the aim of changing the set of measurements up until the next time step, the set of measurements will not coincide with that obtained in the previous step.

Thus obtained set of measurements of the mutual temporal errors of this group of base stations will contain no more errors associated with indirect distribution of signals than the initial set.

Thus, errors associated with indirect distribution of signals from base stations on the measuring device can be reduced. Moreover, izbytochnoe a set of measurements of the mutual temporal errors of this group of base stations, the greater the reduction of errors.

is this group on the received set of measurements of the mutual temporal errors of this group of base stations.

Found temporary mismatch base station signal from the reference signal of the base station group is passed to the appropriate base station group.

For each base station, in addition to the reference base station group, carry out the correction of its time in accordance with the found temporary misalignment its signal from the reference signal of the base station group.

At the second stage, time synchronization of all groups of base stations in the reference group of base stations, which perform the following procedure.

Provide measurements of the mutual time difference of signals of the base stations of different groups of base stations by measuring devices I+1-th group.

The measured mutual time of the error signals of the base stations of different groups of base stations transmit in the centre of locating mobile users.

For each group of base stations are temporary misalignment of the signals in this group of base stations from signals of a reference group of base stations.

Found temporary error signals of groups of base stations from signals of a reference group of base stations transmit on the of Tanzi, carry out correction of their time in accordance with the detected time difference of signals of groups of base stations from signals of a reference group of base stations.

Thus, the method according to [2] is the following:
break all the base stations a radio communication system on the first group of base stations in such a way that each group of base stations serving a single base station controller,
select each group of base stations a base station and identifies it as the reference base station of this group of base stations,
define one reference base station as the reference base station radio system and corresponding group as the reference group of base stations,
install the measuring device in such a way that each of the measuring unit performs the measurement of the mutual temporal error signals of at least one pair of base stations, the signal any base station is received at least one measuring device,
break measuring devices-I+1 group in such a way that the i-th group of measuring devices, where i takes values from 1 to I, includes a measuring device for measuring UV includes a measuring device, measuring mutual time of the error signals of the base stations of different groups,
carry out periodically time synchronization of the base station signal in two stages, the first stage for each group of base stations perform time synchronization within a group of base stations, for which:
provide measurements of the mutual time difference of signals of the base stations via a measuring device of this group,
transmit the measured mutual time of the error signals of the base stations to the base station controller of this group,
change the combination of the measured mutual time difference of signals of the base stations of this group, thus reducing errors associated with indirect distribution of signals from the base stations to the measuring devices,
for each base station are temporary misalignment its signal from the reference signal of the base station of this group,
passed found temporary mismatch base station signal from the reference signal of the base station group to the corresponding base station group,
for each base station, in addition to the reference base station group, carry out the gas station groups,
at the second stage, time synchronization of all base stations of the radio system, for which:
provide measurements of the mutual time difference of signals of the base stations of different groups of base stations by measuring devices I+1-th group,
transmit the measured mutual time of the error signals of the base stations of different groups of base stations in the centre of locating mobile users,
for each group of base stations are temporary misalignment of the signals in this group of base stations from signals of a reference group of base stations,
passed found temporary error signals of groups of base stations from signals of a reference group of base stations at the base station of the respective groups,
for base stations of all groups, except for the reference group of base stations, carry out the correction of their time in accordance with the detected time difference of signals of groups of base stations from signals of a reference group of base stations.

The method according to [2] has the following major drawbacks.

First, in [2] provided only time synchronization of the base stations of the radio system. VM is URS automatic switching to another base station, when a mobile station moves from cell to cell, it is necessary to carry out frequency synchronization of base stations.

Secondly, the accuracy of time synchronization of the base stations is largely determined by the signal conditions of the base stations (the presence or absence of the direct rays). In the method according to [2] proposed a sequence of actions aimed at reducing the errors associated with indirect distribution of signals from base stations on the measuring device, however, receive the synchronization accuracy may be insufficient, for example, for the purposes of locations.

The technical result, which directed the inventive method is, firstly, ensuring synchronization of base stations in the communication system according to the frequency, and, secondly, improving the accuracy of synchronization of base stations of a communication system time.

This result is due to the fact that in the inventive method, the synchronization signals of the base stations in the communication system, in which there are N base stations, the first base station controllers, measuring device and the Central location of mobile users, in which:
break all the base stations of the radio system NH stations,
select each group of base stations a base station and identifies it as the reference base station of this group of base stations,
define one reference base station as the reference base station radio system and corresponding group as the reference group of base stations,
install the measuring device in such a way that each of the measuring unit performs the measurement of the mutual temporal error signals of at least one pair of base stations, the signal any base station is received at least one measuring device,
break measuring devices-I+1 group in such a way that the i-th group of measuring devices, where i takes values from 1 to I, includes a measurement device that measures the mutual temporal mismatch base station signal of the i-th group, and the I+1-th group measuring device includes a measuring device that measures the mutual time of the error signals of the base stations of different groups,
carry out periodically time synchronization of the base station signal in two stages, the first stage for each group of base stations perform the temporal is glasovany signals of base stations via a measuring device of this group,
transmit the measured mutual time of the error signals of the base stations to the base station controller of this group,
for each base station are temporary misalignment its signal from the reference signal of the base station of this group,
passed found temporary mismatch base station signal from the reference signal of the base station group to the corresponding base station group,
for each base station, in addition to the reference base station group, carry out the correction of its time in accordance with the found temporary misalignment its signal from the reference signal of the base station group,
at the second stage, time synchronization of all base stations of the radio system, for which:
provide measurements of the mutual time difference of signals of the base stations of different groups of base stations by measuring devices I+1-th group,
transmit the measured mutual time of the error signals of the base stations of different groups of base stations in the centre of locating mobile users,
for each group of base stations are temporary misalignment of the signals in this group of base stations from the gas stations from signals of a reference group of base stations at the base station of the respective groups,
for base stations of all groups, except for the reference group of base stations, carry out the correction of their time in accordance with the detected time difference of signals of groups of base stations from signals of a reference group of base stations, according to the invention introduce a new sequence of actions:
determine the reference base station reference time and frequency for a given radio system
each measuring device additionally provides for the measurement of the reciprocal frequency error signal base station,
in parallel with the temporal synchronization signals of base stations carry out periodically the frequency synchronization signals of base stations in two stages, the first stage for each group of base stations carry out frequency synchronization within a group of base stations, for which:
carry out the measurement of the reciprocal of the frequency difference of the signals of the base stations via a measuring device of this group,
transmit the measured reciprocal frequency error signal base stations to the base station controller of this group,
for each base station a temporary misalignment its signal from the signal any signals of base stations in this group,
for each base station are frequency misalignment its signal from the reference signal of the base station of this group as a weighted sum of the measured mutual frequency difference of the signals of the base stations of this group,
transmit the found frequency error of the base station signal from the reference signal of the base station group to the corresponding base station group,
for each base station, in addition to the reference base station group, carry out the adjustment of its frequency in accordance with the detected frequency error of its signal from the reference signal of the base station group in the second stage, carry out frequency synchronization of all base stations of the radio system, for which:
carry out the measurement of the reciprocal of the frequency difference of the signals of the base stations of different groups of base stations by measuring devices I+1-th group,
transmit the measured reciprocal frequency error signal base stations of different groups of base stations in the centre of locating mobile users,
for each pair of groups of base stations average measured mutual time and frequency error signals of base stations this is the first signals from the reference group of base stations is found as a weighted sum of the average mutual temporal mismatches groups of base stations,
for each group of base stations are frequency mismatch signals this group of base stations from signals of a reference group of base stations as a weighted sum of the average mutual frequency mismatches groups of base stations,
transmit the found frequency error signals of groups of base stations from signals of a reference group of base stations at the base station of the respective groups,
for base stations of all groups, except for the reference group of base stations, carry out the correction of their frequency in accordance with the found time and frequency difference of the signals of groups of base stations from signals of a reference group of base stations.

Moreover, for example, when the temporal frequency of the error signal of the base station of the first group of base stations from the reference signal of the base station of its group weight is defined as the row elements of the matrix pseudo-inverse to the matrix of the i-th group of base stations with dimension [(Ni-1)Ki], Ni- the number of base stations of the group Toi- the number of dimensions of reciprocal time and frequency errors of the signals of the base stations of the group, in which each column according to animal value from 1 to Kicorresponds to the k-th dimension of reciprocal time and frequency mismatch of the n-th and l-th base stations, if the n-th and l-I of the base station are not supporting base station group, the n-th element of the k-th row of the matrix group is equal to 1, l-th element of the k-th row of the matrix group is equal to -1, and the remaining elements of the kth row of the matrix group is equal to 0 if the n-th base station is the base station group, l-th element of the k-th row of the matrix group is equal to -1, and the remaining elements of the kth row of the matrix group is equal to 0, if l-th base station is the reference base station group, the n-th element of the k-th row of the matrix group is equal to 1, the remaining elements of the kth row of the matrix group is equal to 0.

When the time and frequency error signals of the group of base stations from signals of a reference group of base stations weight is defined as the row elements of the matrix pseudo-inverse to the matrix of aggregate groups of dimension [(I-1)K] , K is the number of averaged measurements of mutual temporal and frequency difference of signals of different groups of base stations, in which each column corresponds to one of the groups of base stations except for the reference group of base stations, and the k-th line, the error of the n-th and l-th group of base stations, if the n-th and l-th group of base stations are not the reference group of base stations, the n-th element of the k-th row of the matrix population groups is equal to 1, l-th element of the k-th row of the matrix population groups is equal to -1, and the remaining elements of the kth row of the matrix population groups is equal to 0 if the nth group of base stations is the reference group of base stations, l-th element of the k-th row of the matrix population groups is equal to -1, and the remaining elements of the kth row of the matrix population groups is equal to 0, if the l-th group of base stations is the reference group of base stations, the n-th element of the k-th row of the matrix population groups is equal to 1, the remaining elements of the kth row of the matrix population groups is equal to 0.

Comparative analysis of the prototype [2] the proposed method synchronization signals of the base stations in the communication system shows that the inventive method is characterized by the presence of new significant features, which together allow us to improve the accuracy of the synchronization signals of the base stations of the radio system over time and to provide synchronization of the base station signal frequency.

Differences between the proposed method from the prototype [2] are as follows.

Determine the reference base station etalonnage device additionally provides for the measurement of the reciprocal frequency error signal base stations this feature in the prototype [2] is missing).

In parallel with the temporal synchronization signals of base stations carry out periodically the frequency synchronization signals of base stations in two stages, the first stage for each group of base stations carry out frequency synchronization within a group of base stations, for which:
carry out the measurement of the reciprocal of the frequency difference of the signals of the base stations via a measuring device of this group (this characteristic prototype [2] is missing),
transmit the measured reciprocal frequency error signal base stations to the base station controller of this group (this characteristic prototype [2] is missing),
for each base station a temporary misalignment its signal from the reference signal of the base station of this group is found as a weighted sum of the measured mutual time difference of signals of the base stations in this group (this method of finding a temporary mismatch signal of the base station from the signal of the reference base station allows to minimize errors associated with noise and system noise, and reduce errors associated with indirect distribution of signals, which increases the accuracy of the provisional raccolto stations of this group, as a weighted sum of the measured mutual frequency difference of the signals of the base stations in this group (this characteristic prototype [2] is missing),
transmit the found frequency error of the base station signal from the reference signal of the base station group to the corresponding base station group (this characteristic prototype [2] is missing),
for each base station, in addition to the reference base station group, carry out the adjustment of its frequency in accordance with the detected frequency error of its signal from the reference signal of the base station group (this characteristic prototype [2] is missing),
at the second stage, the frequency synchronization of all base stations of the radio system, for which:
carry out the measurement of the reciprocal of the frequency difference of the signals of the base stations of different groups of base stations by measuring devices I+1-th group (this characteristic prototype [2] is missing),
transmit the measured reciprocal frequency error signal base stations of different groups of base stations in the centre of locating mobile users (this feature in the prototype [2] is missing),
for each pair of groups of base stations average ISM is rototype [2] is missing), for each group of base stations temporary misalignment of the signals in this group of base stations from signals of a reference group of base stations is found as a weighted sum of the average mutual temporal mismatches groups of base stations (this method of finding temporary error signals of the group of base stations from signals of a reference group of base stations to minimize errors associated with noise and system noise, and reduce errors associated with indirect distribution of signals, which increases the accuracy of the temporary mismatch),
for each group of base stations are frequency mismatch signals this group of base stations from signals of a reference group of base stations as a weighted sum of the average mutual frequency mismatches groups of base stations this feature in the prototype [2] is missing),
transmit the found frequency error signals of groups of base stations from signals of a reference group of base stations at the base station of the respective groups (this characteristic prototype [2] is missing),
for base stations of all groups, except for the reference group of base stations, carry out the correction of their net assets from signals of a reference group of base stations (this characteristic prototype [2] is missing).

The presence of significant new features that combine to provide improved accuracy of time synchronization signals of base stations and provide synchronization frequency signals of base stations, allow us to conclude that the claimed method meets the criterion of "novelty".

Comparison of proposed method with other technical solutions known in the art, revealed no signs similar to those stated in the characterizing part of the claims.

Description of the invention is illustrated graphics.

Fig. 1 illustrates the partitioning of base stations into groups, the choice of the reference base station, the reference group of base stations and the reference base stations in each group.

In Fig. 2 shows the placement of measuring devices between base stations and the splitting of the measuring devices into groups.

In Fig. 3 shows an example of performing a measurement device for measuring the mutual temporal and frequency error signals of two base stations.

Consider the work of the proposed method of synchronizing base stations in the communication system using illustrative material - Fig.and base stations KBS-1 are the base station BS-1-1, BS-1-2, BS-1-3,..., BS-1-N1.

Under the control of the base station controller ASC-2 are the base station BS-2-1, BS-2-2,..., BS-2-N2.

Under the control of the base station controller ASC-I are the base station BS-1-1, BS-1-2,..., BS-1-NI.

Accordingly, the number of groups equals the number of base station controllers of the first communication system; in the first group include the base station BS-1-1, BS-1-2, BS-1-3,..., BS-1-N1under management of the base station controller ASC-1, the second group includes the base station BS-2-1, BS-2-2,..., BS-2-N2under management of the base station controller ASC-2, I-th group include the base station BS-I-1, BS-I-2,..., BS-I-NIunder management of the base station controller ASC-I.

Select each group of base stations a base station and identifies it as the reference base station of this group of base stations. In Fig. 1 as the reference base station in the first group of base stations of the selected base station BS-1-N1in the second group of base stations is a base station BS-2-N2and in the I-th group of base stations is a base station BS-I-NI.

Define one reference base station as the reference base station sisney base station defined reference base station BS-I-NII-th group of base stations. Accordingly, the I-th group of base stations is defined as the reference group of base stations.

On the reference base station BS-I-NIdetermine the reference time and frequency for the radio system.

In Fig. 2 shows that the base station controllers and base stations, which are shown in Fig.1, added measuring devices.

The measuring device PS-1-1 receives signals from base stations BS-1-1, BS-1-2 and BS-1 to 3, in particular the direct rays of the data signals, and performs measurement of mutual temporal and frequency mismatches of data signals to base stations.

It should be noted that the measuring device measures the mutual temporal and frequency error signals of all the base stations, the signals which it can take. Upon receiving the signals of two base stations is measured as temporary mutual and reciprocal frequency error of these signals.

The measuring device PS-1-K1receives signals from base stations BS-1-2 and BS-1-N1in particular the direct rays of the data signals, and performs measurement of mutual temporal and frequency difference between them.

The measuring device receives signals from base stations BS-2-1 and BS-2-2, in particular the direct rays of the data signals, and performs measurement of mutual temporal and frequency difference between them.

The measuring device PS-2-K2that receives signals from base stations BS-2-2 and BS-2-N2in particular the direct rays of the data signals, and performs measurement of mutual temporal and frequency difference between them.

Measuring device PS-2-1,..., PS-2-K2United to the second group of measuring devices.

The measuring device PS-I-1 receives signals from base stations BS-I-1 and BS-I-2, in particular the direct rays of the data signals, and performs measurement of mutual temporal and frequency difference between them.

The measuring device PS-I-KIreceives signals from base stations BS-I-2 and BS-I-NIin particular the direct rays of the data signals, and performs measurement of mutual temporal and frequency difference between them.

Measuring device PS-I-1,..., IU-I-KIUnited to the second group of measuring devices.

The measuring device Yiwu-(I+1)-1 receives signals from base stations BS-1-2 and BS-2-1, in particular the direct rays of the data signals, and performs measurement of mutual temporal and frequency mismatches misty, the direct rays of the data signals, and performs measurement of mutual temporal and frequency difference between them.

The measuring device Yiwu-(I+1)-K receives signals from base stations BS-2-1 and BS-I-2, in particular the direct rays of the data signals, and performs measurement of mutual temporal and frequency difference between them.

Measuring device Yiwu-(I+1)-1, PS(I+1)-2,..., PS(I+1)-K United in the (I+1)-th group of measuring devices.

Synchronization signals of the base stations of the radio system perform, periodically repeating two stages of synchronization. In the first stage, for each group of base stations perform temporal and frequency synchronization within a group of base stations. At the second stage, temporal and frequency synchronization of groups of base stations a radio communication system among themselves.

At the first stage when performing time and frequency synchronization within a group of base stations perform the following steps.

Provide measurements of mutual temporal and frequency errors of the signals of the base stations via a measuring device of this group.

Explain how to assess the temporal and frequency assogestioni code division of channels. The base station radio system transmit signals containing channels, pilot signal (see Century, kartashevskaya street, S. N. Semenov, I. C. Firstova. A mobile network. ): Eco-Trends, 2001, S. 45 [3]), and pilot signals of different base stations are expanding different pseudo-random sequences (SRP) with the same periods equal to R chip pseudo-random sequence of the SRP. Under the chip SRP should understand the elementary time interval pseudo-random sequence.

In Fig. 3 shows an example of performing a measurement device for measuring the mutual temporal and frequency error signals of base stations.

Measuring device for measuring the mutual temporal and frequency error signals of two base stations in accordance with Fig. 3 includes an antenna 1, an analog receiver 2, the search block of the signal, the first base station 3, the search block signal of the second base station 4, the decoder synchronal first base station 5, the decoder synchronal second base station 6, the computing unit mutual temporary mismatch of the signals of two base stations 7, the block selection signal, the first base station 8, the block selection signal of the second base station 9, the block is 11 and the computing unit reciprocal frequency error signals of two base stations 12.

When the input of the antenna 1 is the input of the measuring device, the output of the antenna 1 is connected to the input of the analog receiver 2, the output of which is connected to the inlet of the search signal, the first base station 3 and the search block signal of the second base station 4 and the first inputs of the decoder synchronal first base station 5, the decoder synchronal second base station 6, a block selection signal, the first base station 8 and the block selection signal of the second base station 9, the output of block search signal, the first base station 3 connected to the first input of the computing unit of the mutual temporal mismatch of the signals of two base stations 7 and with the second inputs of the decoder synchronal first base station 5 and the block selection signal, the first base station 8.

The output of the decoder synchronal first base station 5 is connected with the second input of the computing unit of the mutual temporal mismatch of the signals of two base stations 7, the output of block search signal of the second base station 4 is connected to the third input of the computing unit of the mutual temporal mismatch of the signals of two base stations 7 and with the second inputs of the decoder synchronal second base station 6 and the block selection signal of the second b calculate the mutual temporal mismatch of the signals of two base stations 7, the output is the first output of the measuring device, the output of the block selection signal, the first base station 8 is connected to the input of the evaluation unit of the phase shift signal, the first base station 10, the output of which is connected to the first input of the computing unit reciprocal frequency error signals of two base stations 12.

The output of the block selection signal of the second base station 9 is connected to the input of the evaluation unit of the phase shift signal to the second base station 11, the output of which is connected with the second input of the computing unit reciprocal frequency error signals of two base stations 12 whose output is the second output of the measuring device.

When this analog receiver may be performed, for example, as described in patent US 5103459 "System and Method for Generating Signal Waveforms in a CDMA Cellular Telephone System", Int. Cl5H 04 L 27/30 [4].

The decoder synchronal the first and second base stations may be performed, for example, as described in [3].

The block selection signal, the first and second base stations may also be performed, for example, as described in [3], or as described in Andrew J. Viterbi, CDMA Principles of Spread Spectrum Communication. Addison-Wesley Publishing Company, 1995 [5].

Unit search signal, the first and second base stations may be the issue is th base stations, is fed to the input of the antenna 1, the output of which is fed to the input of the analog receiver 2, containing, including the frequency synthesizer.

From the output of the analog receiver 2 signal is applied to the inputs of block search signal, the first base station 3 and the search block signal of the second base station 4 and the first inputs of the decoder synchronal first base station 5, the decoder synchronal second base station 6, a block selection signal, the first base station 8 and the block selection signal of the second base station 9.

Unit search signal, the first base station 3 searches for a signal, the first base station within the uncertainty ranges of length R chip SRP. Assume that the signal of the first base station was found at position R1. The value of the detected position signal, the first base station1passed from the output of the search block of the signal, the first base station 3 to the first input of the computing unit of the mutual temporal mismatch of the signals of two base stations 7 and to the second input of the decoder synchronal first base station 5.

The search block signal of the second base station 4 performs the search signal of the second base station within the uncertainty ranges of length R chip SRP. Suppose that sincanli2transmit from the output of the search block signal of the second base station 4 to the second input of the computing unit of the mutual temporal mismatch of the signals of two base stations 7 and to the second input of the decoder synchronal second base station 6.

The decoder synchronal first base station 5 with the value of the detected position signal, the first base station P1, decodes synchronal first base station, receiving the time value of the first base station T1corresponding to the time of transmission of the first chip SRP first base station. The obtained time value of the first base station T1passed from the output of the decoder synchronal first base station 5 to the third input of the computing unit of the mutual temporal mismatch of the signals of two base stations 7.

The decoder synchronal second base station 6, with the value of the detected position signal of the second base station P2, decodes synchronal second base station, receiving the time value of the second base station T2corresponding to the time of transmission of the first chip SRP second base station. The obtained time value of the second base station T2passed from the output of the decoder synchronal vtoro the gas stations 7.

Let the difference of temporal distance (difference divided by the speed of light) from the first base station to the measuring device and from the second base station to the measuring device is equal tot1-->>2.

The computing unit mutual temporary mismatch of the signals of two base stations 7 calculates the mutual temporal mismatch signal, the first base station signal from the second base station according to the formula:
T1-T2+(P1-P2Tch+t1-->>2,
where Tch- the duration of one chip of the SRP.

Thus, the output of block 7 and, respectively, the first output of the measuring device receives the value of the mutual temporal mismatch signals of the first and second base stations.

The block selection signal, the first base station 8, containing at least the reference signal generator to the first base station and the correlator that performs the selection signal, the first base station and transmits the selected signal from its output to the input of the evaluation unit of the phase shift signal, the first base station 10.

The evaluation unit of the phase shift signal, the first base station 10 performs ienced the phase shift signal, the first base station relative to the signal of the frequency synthesizer for the time interval T must understand the change in the phase difference signal to the first base station and the reference signal for the time interval T. The assessed value of the phase shift signal, the first base station1passed from the output of the evaluation unit of the phase shift signal, the first base station 10 to the first input of the computing unit reciprocal frequency error signal base stations 12.

The block selection signal of the second base station 9, containing at least the generator reference signal to the second base station and the correlator that performs the selection signal of the second base station and transmits the selected signal from its output to the input of the evaluation unit of the phase shift signal to the second base station 11.

The evaluation unit of the phase shift signal to the second base station 11 performs the evaluation of the phase shift signal to the second base station relative to the signal of the frequency synthesizer for a specified time interval So Under the phase shift signal to the second base station relative to the reference signal for the time interval T must understand the change in the phase difference signal to the second base station and the reference signal for a time interval T. the Value of the estimated phase shift signal to the second base station2passed from the output of the evaluation unit of the phase shift Segalovich stations 12.

The computing unit reciprocal frequency error signal base station 12 computes the reciprocal frequency error signal of the first base station signal from the second base station according to the formula:
(1-2)/T.
Thus, the output of block 12 and respectively to the second output of the measuring device receives the value of the reciprocal frequency error signal of the first and second base stations.

Then transmit the measured mutual time and frequency error signals of base stations by a base station controller of this group of base stations.

Transfer the measured mutual time and frequency errors of the signals of the base stations to the base station controller of this group are carried out through the base station of this group.

To transfer the measured mutual time and frequency mismatches with the measuring devices on the base station provided for use in the communication system, the radio interface between mobile stations and base stations.

To transfer the measured mutual time and frequency resolute station with base station controllers.

After that, for each base station are temporary misalignment its signal from the reference signal of the base station of this group as a weighted sum of the measured mutual time difference of signals of the base stations of this group and find the frequency mismatch of its signal from the reference signal of the base station of this group as a weighted sum of the measured mutual frequency difference of the signals of the base stations of this group.

When the temporal frequency of the error signal of the base station of the first group of base stations from the reference signal of the base station of its group weight is defined as the row elements of the matrix pseudo-inverse to the matrix of the i-th group of base stations.

The weights used for finding temporary mismatch signal of the base station of the first group of base stations from the reference signal of the base station of its group, with the same weights used to find the frequency error signal of the base station of the first group of base stations from the reference signal of the base station of its group.

The matrix i-th group of base stations has rank
[(Ni-1)Ki],
where Ni- the number of base stations of the group.

In the matrix of the i-th group of base stations each column corresponds to one of the base stations of the group, except for the reference base station group, and the k-th line, where k takes values from 1 to Kicorresponds to the k-th dimension of reciprocal time and frequency mismatch of the n-th and l-th base stations, thus:
if the n-th and l-th base station are not supporting base station group, the n-th element of the k-th row of the matrix group is equal to 1, l-th element of the k-th row of the matrix group is equal to -1, and the remaining elements of the kth row of the matrix group 0
if the n-th base station is the base station group, the l-th element of the k-th row of the matrix group is equal to -1, and the remaining elements of the kth row of the matrix group 0
if the l-th base station is the reference base station group, the n-th element of the k-th row of the matrix group is equal to 1, the remaining elements of the kth row of the matrix group is equal to 0.

The matrix of each group of base stations, and therefore weight, only changes when you change the configuration of the radio communication network, so it will have to calculate very rarely (at constant configuration it will have to be calculated only once).

Found the time and frequency error of the base station signal from whitefish and use wired communication line, connecting the base station controllers and their base stations.

After that, for each base station, in addition to the reference base station group, carry out the correction of its time and frequency in accordance with the found time and frequency mismatch its signal from the reference signal of the base station group.

At the second stage when performing time and frequency synchronization of groups of base stations a radio communication system between a perform the following steps.

Provide measurements of mutual temporal and frequency errors of the signals of the base stations of different groups of base stations by measuring devices I+1-th group. The dimension of reciprocal time and frequency errors of the signals of the base stations of different groups of base stations perform the same way as before.

Transmit the measured mutual time and frequency error signals of base stations of different groups of base stations in the centre of locating mobile users.

Transfer the measured mutual time and frequency errors of the signals of the base stations in the centre of locating mobile users carry out databases through the spruce associated with all base station controllers directly or through other base station controllers wired communication lines, which are used for transmission of the measured mutual time and frequency errors of the signals of the base stations of base station controllers in a Central location of mobile users.

For base stations of the two groups of base stations can be performed one or more dimensions of reciprocal time and frequency errors of the signals of the base stations of these groups, or not to be a single dimension.

If for base stations of the two groups of base stations made more than one dimension of reciprocal time and frequency errors of the signals of the base stations of these groups, the measured mutual time and frequency error signals of the base stations of these groups average.

Then, for each group of base stations are temporary misalignment of the signals in this group of base stations from signals of a reference group of base stations as a weighted sum of the average mutual temporal mismatches groups of base stations, and estimates a frequency error signals of the group of base stations from signals of a reference group of base stations as a weighted sum of the average mutual frequency mismatches groups of base stations.

The weights used for finding temporary error signals of the group of base stations from signals of a reference group of base stations, the same weights were used to find the frequency mismatch of the signals of the group of base stations from signals of a reference group of base stations.

Matrix population groups has rank
[(I-1)K],
where K is the number of averaged measurements of mutual temporal and frequency difference of signals of different groups of base stations.

In the matrix together groups each column corresponds to one of the groups of base stations except for the reference group of base stations, and the k-th line, where k takes values from 1 to K corresponds to the k-th averaged measurement of the mutual temporal and frequency mismatch of the n-th and l-th groups of base stations, thus:
- if the n-th and l-th group of base stations are not the reference group of base stations, the n-th element of the k-th row of the matrix population groups is equal to 1, l-th element of the k-th row of the matrix population groups is equal to -1, and the remaining elements of the kth row of the matrix population groups 0
- if the nth group of base stations is s the elements of the kth row of the matrix population groups 0
- if the l-th group of base stations is the reference group of base stations, the n-th element of the k-th row of the matrix population groups is equal to 1, the remaining elements of the kth row of the matrix population groups is equal to 0.

Found the time and frequency error signals of groups of base stations from signals of a reference group of base stations transmitting on base station of the respective groups. The transfer is performed via the base station controllers of the respective groups. For transmission found time and frequency mismatches with the center location of the mobile user to the base station controllers use a wired communication line connecting the center location of the mobile user and base station controllers.

For base stations of all groups, except for the reference group of base stations, carry out the correction of their time and frequency in accordance with the found time and frequency difference of the signals of groups of base stations from signals of a reference group of base stations.

Base stations, base station controllers and the Central location of mobile users can be performed, for example, as in the prototype [2].

For what usesthe compared with the prototype [2] and others, known in the art, inventions.

First, the inventive method allows for base stations supporting generators, less stable and at the same time, to meet requirements for radiation signals in accordance with the selected grid of frequencies. This technical effect is achieved by the introduction of the method operations for measuring the frequency difference of the signals from base stations and tune them in the reference generator.

Secondly, in the inventive method introduced a new sequence of operations related to the set of measurements of time difference of signals of the base stations, which allows to minimize the error estimates associated with noise and system noise, and reduce errors associated with indirect distribution of signals from base stations to the measuring devices.

These advantages of the proposed method allows to provide synchronization signals of the base stations in the communication system according to the frequency and to improve the accuracy of synchronization of base stations of the radio system over time.


Claims

1. The method of synchronization signals of the base stations in the communication system, to the location of the mobile user, when you break all the base stations a radio communication system on the first group of base stations in such a way that each group of base stations serving a single base station controller, select each group of base stations a base station and identifies it as the reference base station of this group of base stations, determine a reference base station as the reference base station radio system and corresponding group as the reference group of base stations, install the measuring device in such a way that each of the measuring unit performs the measurement of the mutual temporal error signals of at least one pair of base stations, when this signal is any base station is taken with at least one measuring device, smash measuring devices-I+1 group in such a way that the i-th group of measuring devices, where i takes values from 1 to I, includes a measurement device that measures the mutual temporal mismatch base station signal of the i-th group, and the I+1-th group measuring device includes a measuring device that measures the mutual time of the error signals of the base stations of different groups, assests what each group of base stations perform time synchronization within a group of base stations, why provide measurements of the mutual time difference of signals of the base stations via a measuring device of this group, transmit the measured mutual time of the error signals of the base stations to the base station controller of this group, for each base station are temporary misalignment its signal from the reference signal of the base station of this group, pass found temporary mismatch base station signal from the reference signal of the base station group to the corresponding base station group, for each base station, in addition to the reference base station group, carry out the correction of its time in accordance with the found temporary misalignment its signal from the reference signal of the base station group, at the second stage, time synchronization of all base stations of the radio system, which provide measurements of the mutual time difference of signals of the base stations of different groups of base stations by measuring devices I+1-th group, transmit the measured mutual time of the error signals of the base stations of different groups of base stations in the Central location of the mobile polzovatsya from signals of a reference group of base stations, passed found temporary error signals of groups of base stations from signals of a reference group of base stations at the base station of the corresponding groups for the base stations of all groups, except for the reference group of base stations, carry out the correction of their time in accordance with the detected time difference of signals of groups of base stations from signals of a reference group of base stations, characterized in that to determine the reference base station reference time and frequency for a given radio system, each measuring device additionally provides for the measurement of the reciprocal frequency error signal base stations, in parallel with the temporal synchronization signals of base stations carry out periodically the frequency synchronization signals of base stations in two stages, the first stage for each group of base stations carry out frequency synchronization within a group of base stations, which provide measurements of the mutual frequency difference signals of base stations via a measuring device of this group, transmit the measured reciprocal frequency error of the base station signal to the controller basovitoj stations of this group is found as a weighted sum of the measured mutual time difference of signals of the base stations of this group for each base station are frequency misalignment its signal from the reference signal of the base station of this group as a weighted sum of the measured mutual frequency difference of the signals of the base stations of this group, transmit the found frequency error of the base station signal from the reference signal of the base station group to the corresponding base station group, for each base station, in addition to the reference base station group, carry out the adjustment of its frequency in accordance with the detected frequency error of its signal from the reference signal of the base station group in the second stage, carry out frequency synchronization of all base stations of the radio system, which provide measurements of the mutual frequency difference of the signals of the base stations of different groups of base stations by measuring devices I+1-th group, transmit the measured reciprocal frequency error signal base stations of different groups of base stations in the centre of locating mobile users, for each pair of groups of base stations average measured mutual time and frequency error signals of the base stations of these groups, for each group of base stations temporary misalignment of the signals in this group of base stations from signals of a reference group of base stations is found as a weighted sum of the average mutual temporal mismatches groups basic stay from signals of a reference group of base stations as a weighted sum of the average mutual frequency mismatches groups of base stations, transmit the found frequency error signals of groups of base stations from signals of a reference group of base stations at the base station of the corresponding groups for the base stations of all groups, except for the reference group of base stations, carry out the correction of their frequency in accordance with the found time and frequency difference of the signals of groups of base stations from signals of a reference group of base stations.

2. The way in.1, characterized in that when the temporal frequency of the error signal of the base station of the first group of base stations from the reference signal of the base station of its group weight is defined as the row elements of the matrix pseudo-inverse to the matrix of the i-th group of base stations with dimension [(Ni- 1)Toi], N is the number of base stations of the group Toi- the number of dimensions of reciprocal time and frequency errors of the signals of the base stations of the group, in which each column corresponds to one of the base stations of the group, except for the reference base station group, and the k-th row, where k takes values from 1 to Kicorresponds to the k-th dimension of reciprocal time and frequency mismatch of the n-th and l-th base stanzaic group is equal to 1, l-th element of the k-th row of the matrix group is equal to -1, and the remaining elements of the kth row of the matrix group is equal to 0 if the n-th base station is the base station group, the l-th element of the k-th row of the matrix group is equal to -1, and the remaining elements of the kth row of the matrix group is equal to 0, if l-I the base station is the base station group, the n-th element of the k-th row of the matrix group is equal to 1, the remaining elements of the kth row of the matrix group is equal to 0.

3. The method according to p. 1, characterized in that when the temporal and frequency error signals of the group of base stations from signals of a reference group of base stations weight is defined as the row elements of the matrix pseudo-inverse to the matrix of aggregate groups of dimension [(I-l)K], K is the number of averaged measurements of mutual temporal and frequency difference of signals of different groups of base stations, in which each column corresponds to one of the groups of base stations except for the reference group of base stations, and the k-th row, where k takes values from 1 to K corresponds to the k-th averaged measurement of the mutual temporal and frequency mismatch of the n-th and l-th group of base stations, if the n-th and l-th group of base stations is not t k-th row of the matrix population groups is equal to -1, other elements of the k-th row of the matrix population groups is equal to 0 if n-I group of base stations is the reference group of base stations, l-th element of the k-th row of the matrix population groups is equal to -1, and the remaining elements of the kth row of the matrix population groups is equal to 0, if l-I group of base stations is the reference group of base stations, the n-th element of the k-th row of the matrix population groups is equal to 1, the remaining elements of the kth row of the matrix population groups is equal to 0.

 

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1 cl, 7 dwg, 1 tbl

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