Method and device for synchronization of wireless communication systems

 

The invention relates to communications systems. The technical result consists in increasing the synchronization process of the wireless communication system. The system contains a set of base stations and mobile stations communicating. The first base station from the multiple base stations transmits the first signal in the first subset of the mobile stations. The second base station transmits the second signal to the second subset of the mobile stations, prohibits the transmission of the second signal during the control period and the reception of the first signal during the control period, adjusts the internal clock generator in accordance with the received signal. 6 C. and 10 C.p. f-crystals, 1 tab., 6 Il.

The technical field to which the invention relates

The present invention relates to communications systems. More specifically, the present invention relates to a new and improved method and apparatus for synchronization of base stations in the wireless communications system.

The level of technology

The method of modulation, multiple access, code-division multiplexing (mdcr) is one of several ways to facilitate communication, in which there are a large number of polzovateley channels (mdvr), multiple access frequency division multiple access (FDMA equipment), and amplitude modulation scheme, such as, for example, schemes with single-sideband signal with komandirovannoi amplitude (OPCA), mdcr has significant advantages over these other modulation methods. Using methods mdcr in the communication system of multiple access are disclosed in U.S. patent No. 4901307, entitled "communication System multiple access spread spectrum using satellite or terrestrial repeaters", and U.S. patent No. 5103459, entitled "System and method for generating waveforms of signals in a cellular telephone system mdcr". The method of providing mobile communication mdcr was standardized in the United States by the Association of communications industry standard TIA/EIA/IS-95-A, entitled "Standard compatibility mobile station-base station for dual-mode wideband cellular communication system with extended range" mentioned in the present description as IS-95.

In the just mentioned patent disclosed a method of multiple access, in which a large number of users of mobile stations, each having a transceiver, communicate through satellite repeaters or terrestrial base stanza multiple access, code-division multiplexing (mdcr). When using connection mdcr frequency spectrum can be reused many times, thus giving the possibility of increasing the throughput of the system user. Using methods mdcr results in higher spectral efficiency that can be achieved using other multiple access methods.

Method for the simultaneous demodulation of the data that is passed along various routes of spread from one base station, and for the simultaneous demodulation of data redundantly secured from more than one base station is disclosed in U.S. patent No. 5109390, entitled "Receiver with receive diversity in a cellular telephone system mdcr". In patent No. 5109390 separately demodulated signals are combined to provide an estimate of the transmitted data, which have a higher reliability than the data demodulated at any one route or from any one base station.

Transfer service can usually be divided into two categories: hard transfer service and a soft transfer. When hard transmission service when the mobile station leaves the source base station and included in the basic who establishes a new communication link with the base station of destination. When soft the transfer of the mobile station terminates the communication with the base station of destination before the interrupt his line of communication with the source base station. Thus, when the soft handover of the mobile service station is redundantly connected with the source base station and base station assignment for some period of time.

Padded transfer of care is significantly less likely to interrupt calls than rigid transmission service. In addition, when the mobile station moves near the border of the service area of the base station, it may make repeated requests for transmission service in response to small changes in the environment. This problem, called alternately switching (“ping-pong”), also significantly reduced soft transfer. An example process to perform a soft transfer service is described in detail in U.S. patent No. 5101501, entitled "Method and system for providing a soft transmission service in a cellular telephone system MTCR".

Advanced soft transfer service is disclosed in U.S. patent No. 5267261, entitled "Soft transfer service through mobile is oceesa measurement of the level of the pilot signals, transmitted by each base station in the mobile station. These level measurement pilot signal help in the process of soft transfer service by facilitating the identification of active base stations as candidates for transmission service.

Base station candidates can be divided into four sets. The first set, called the active set contains the base stations that are currently connected with the mobile station. The second set, called the potential set contains a base station, the signals are defined as strong enough for use by the mobile station, but not used at the moment. Base stations are added to the potential set when the measured energy of the pilot signal exceeds a certain threshold TADD. The third set is a set of base stations that are located near the mobile station (and which are not included in the active set or candidate set). And the fourth set is the rest of the set, which consists of all other base stations.

In IS-95 base station candidate is characterized by a phase shift psevdochumoy (PN) sequence of its channel pilot signal. When the mobile station production and, in which the filtered pilot signal is correlated to many hypotheses PSH-shift. Method and device for performing the correlation operation is described in detail in U.S. patent No. 5644591, titled "Method and apparatus to perform information gathering search in the communication system MTCR".

The propagation delay between the base station and the mobile station is unknown. This unknown delay creates an unknown shift in the PN-code. The search process attempts to identify an unknown shift of the PN-codes. To accomplish this, the mobile station shifts in time, the output signal of their generators PN-code device search. The shift range of the search is called search window. The search box is located in the centre hypotheses about PSH-shift. The base station sends the mobile station a message indicating PSH-shifts the pilot signals of base stations in its physical proximity. The mobile station will center your search around the hypothesis PN-offset.

Suitable size of the search window depends on several factors, including the priority of the pilot signal, the speed of search processors and the expected expansion of the multi-path delay of revenue. Standards mdcr (IS-95) define three ParameterName A. The pilot signals of the set of neighbors searched through the window N, and the pilot signals of the rest of the set - through window R window Sizes of retrieval devices provided in the table, where the elementary signal is equal to 1/1,2288 MHz.

Setting the window size is a trade-off between search speed and the probability of skipping a strong route, outside of the search window.

The base station sends the mobile station a message that defines the hypothesis PSH, this mobile station will find concerning its own PN-offset. For example, the source base station may submit a command to the mobile station to search for a pilot signal for 128 PSH elementary signals ahead of her own PSH-shift. Mobile station in response sets its demodulator device search 128 elementary signals forward in the cycle of the output of the elementary signal, and searches for the pilot signal, using the search box located in the center around a particular shift. When the mobile station is instructed to search for hypotheses PSH in order to determine the resources available to perform transmission maintenance is critical to PSH-shift of the pilot signal to the base camp of the Colo border base station, because of delays in completing the necessary searches can result in dropped calls.

In systems mdcr in the United States this synchronization of the base station is achieved by providing each base station receiver of a satellite global positioning (CST). However, there are cases when the base station is unable to receive a signal CST. For example, in the subway tunnels signal CST is weakened to some extent, which prevents its use for time synchronization of base stations or mikrobasic stations. In addition, there are national programs that rejects dependence on LNG signal for critical services.

The present invention describes a method and system for providing time synchronization in these conditions, when part of the network is able to accept a centralized synchronization signal and run the sync, and some base stations are not able to accept centralized synchronization signals. This situation is addressed in the pending joint resolution application for U.S. patent No. 08/933888, entitled "time synchronization with the mobile station in the communication system mdcr", registered on September 19, 1997, Except that the station does not believe in a centralized synchronization signal.

In the application No. 08/933888 subordinated to the base station achieves synchronization with the leading base station by means of messages transmitted from the mobile station and received by the mobile station during soft handover of care between the leading base station and the slave base station. First measured by double-delay (delay on signal flow in forward and reverse directions) between the mobile station and the leading base station through the base station. Then subordinated to the base station searches up until it is flush with the signal from the mobile station, the call signal of the reverse link. In response to the capture signal return line connection subordinated to the base station adjusts its synchronization so that the mobile station could capture its signal, called signal a straight line. This operation may not be required if the sync error in the slave base station is small.

When the mobile station captures the signal from the sub base station, it measures and reports the difference between the amount of time it takes for the signal to pass from the master base station in the mobile station, and kalichstein necessary measurement is subordinate base station, the time difference between the time when she took the position feedback signal lines of communication from the mobile station, and the time when she gave the signal in the mobile station.

A series of calculations is performed after the measured values to determine the time difference between the slave base station and the leading base station, and setting synchronization slave base station is performed in accordance with them. It should be noted that all the measurements are performed during normal operation of the communication system mdcr IS-95.

The invention

The present invention is a new and improved method and device for synchronization of base stations in the wireless communications system. The present invention describes methods by which a wireless communications system supports synchronized without an external reference signal. One method, disclosed in the application 08/933888 "time synchronization with the mobile station in the communication system mdcr", is the use of messaging mobile stations in the transmission service to determine the relative synchronization of pairs of base stations. When data measured error sync sync base station is configured to support the BOM, should be used in other ways. One approach involves performing a direct measurement synchronization between base stations. This is done in one of two ways. The base station may interrupt their transmission across all sectors within a short period, during which she receives signals from a straight line due from other base stations. Assuming knowledge of the locations of other base stations can be obtained-time error relative to all other base stations. Alternative base station sends a short signal with high power in the frequency band of transmission of the mobile station. The time of receipt of this signal is measured by the surrounding base stations, and calculates the time error between pairs of base stations.

In some cases, the base station can be sufficiently isolated from all other base stations in the network so that a direct measurement between the base stations is impossible. In this case, the fixed dummy station is placed at a location in the zone of transfer of service between an isolated cell by cell and another cell by cell in the network. Fixed dummy station or perform measurements of the pilot signals is aceta at a certain time for the measurement of base stations.

Brief description of drawings

The features, objectives and advantages of the present invention will become more apparent from the detailed description set forth below when read in conjunction with the drawings, in which similar reference characters identify correspondingly from beginning to end and in which

Fig.1 is a block diagram illustrating a first variant implementation of the present invention, in which the base station receives the signal straight line connection of the neighboring base station and adjusts its synchronization in accordance with the received signal; and

Fig.2 is a block diagram illustrating a mobile host subsystem;

Fig.3 is a block diagram illustrating a second variant implementation of the present invention, in which the base station is able to transmit a message through a return line in the neighboring base station that adjusts its synchronization in accordance with the received signal; and

Fig.4 is a block diagram illustrating a fourth variant of implementation of the present invention, in which a fixed dummy station receives signals pryamoy connection lines from the two base stations and transmits a message to one of the base stations indicating the ratio of the synchronization of two basic mill the present invention, in which the fixed dummy station transmits a pilot signal in two base stations that use the time of arrival of the pilot signal to synchronize its internal clock generators;

Fig.6 block diagram of the sixth variant embodiment of the invention, in which a fixed dummy station receives signals from a straight line connection between two base stations and transmits the received signals back to the base station so that they could be used for synchronization.

A detailed description of the preferred embodiments

I. turn Off the base station,

When there is not sufficient data from mobile stations in the transmission service, the transmission of messages on the transfer of servicing mobile stations may not be used for synchronization. It is probable, when there is very little traffic or when the mobile station is substantially stationary. In the first exemplary embodiment of the present invention, the base station receives transmission of a straight line from a neighboring base station or set of neighboring base stations. The base station extracts the necessary timing information from the signal, making the station must prohibit their transfer direct line of communication to to enable reception of signals from other base stations. Referring to Fig.1, base station 104 is configured to receive signals direct line of communication from the base station 100 in order to synchronize its synchronization with the synchronization of the base station 100. If the base station 104 has multiple sectors (not illustrated), then preferably all sectors will cease transmission of the straight line at the same time as the reverse of the petals of the beam will increase levels of signal transmission from the base station 100. The reception signal is a direct line of communication from the base station 100 requires that the base station 104 had a subsystem 150 receiver direct communication line for receiving signals, a direct line of communication from the base station 100.

Since the base station is designed to cover a specific area with some overlap of coverage area of the neighboring cell, not necessarily that the base station can receive signals from other base stations. However, in most deployment is unlikely to be a problem. For example, if the base station are approximately circular (or hexagonal) service area is approximately the same radio the spruce distribution COST-231 loss of the route increases by approximately 10 or 11 dB with a doubling of distance, assuming the antenna heights of base stations in the range of 20-60 m This is a relatively small increase in the loss of the route, which is easily compensated:

1. A longer integration time in the pilot channel signal. Since both the transmitter and receiver are stationary in this case, it is possible sufficiently long integration PSH (if necessary).

2. The absence of losses penetration, usually supposed to work in the car and in the room.

3. High-gain directional antennas of base stations.

4. Antenna heights of base stations that are bigger than the average height of the mobile stations.

5. Reduced interfering the reflected signals.

Thus, a sufficient signal is available in most cases.

Also, it may be necessary to prevent transfer of a straight line relationship with more than one base station simultaneously in order to perform measurement of a straight line. For example, there may be cases when a pair of base stations has a free route line-of-sight (LKP) between them, but all the other neighboring base stations are invisible. In this case, when one of this pair off your transfer, it may the more weak signals from other neighboring base stations. The same result occurs when another base station of this pair off your transfer. The result is that the two base stations are isolated and cannot determine its timing relative to the rest of the network. The connection with the rest of the network is possible only if both base stations are switched off simultaneously. The same problem may occur with a larger group of base stations, which are effectively isolated from the network until, until you have used certain specific combinations off.

To avoid a detailed analysis of the network, which may be required to determine the combinations off, uses a simple approach of an arbitrary set off in fixed intervals. At set intervals, each base station decides randomly turn off or not their programs. In an exemplary embodiment, the probability of a random shutdown is set at 50%. Thus, about 50% of the base stations in the system off every few minutes. Thus, each base station eventually begins to see all of its neighboring base stations.

When the condition known locations BA is upline, and can be determined difference synchronization between cellular compartments. Synchronization errors can be used to configure the synchronization of the base station or by using a centralized processor or by processing in a separate base stations, possibly based on a predetermined hierarchy of base stations.

Off base stations affect direct line of communication for all active mobile stations. To minimize this effect, the off time should be short. Active mobile stations in the service area off the base station to increase its transmit power by approximately 1 dB per millisecond when the signal straight line disappears. If off is only 5 milliseconds, then the recovery time is about 6 msec, and the majority of mobile stations will lose only one frame. If off more than 10 msec, then probably you will lose more than one frame. However, the loss of 2 consecutive frames every 2 minutes equal to the increase in the frequency of errors in frames (PSC) only 0.03%. This is insignificant relative to the working CHOC 1% or more.

Signals direct line of communication transmitted from the base stations 100 and 104, is transmitted at the first frequency. what are at the second frequency. In an exemplary embodiment, the signals straight line and signals the return line is the signal multiple access, code-division multiplexing (mdcr). A sample implementation for full duplex transmission of signals mdcr described in detail in U.S. patent No. 4901307, entitled "communication System multiple access spread spectrum using satellite or terrestrial repeaters".

In base station 100 symbols of the pilot signal and traffic data to a straight line are fed into the modulator 106 a straight line. In an exemplary embodiment, the modulator 106 a straight line is a modulator of multiple access, code-division multiplexing, as described in detail in the aforementioned U.S. patent No. 5103459. The signal multiple access code division of channels is supplied to the transmitter 108 a straight line (Pebls), which converts with increasing frequency, filters and amplifies the signal straight line connection for transmission via the antenna 110.

In addition, signals a return line communications are received via the antenna 116 and fed to the receiver 114 return line connection (Pras). The receiver 114 converts with decreasing frequency, filters and amplifies the received signal of the means for demodulating signals mdcr described in U.S. patent No. 5654979, entitled "the architecture of the demodulator base station for communication systems, multiple access spread spectrum".

In addition to the ability to pass signals direct lines of communication and reception of signals a return line communication base station 104 is able to receive signals direct line of communication transmitted by the base station 100. In the base station 104 symbols of the pilot signal and traffic data to a straight line are fed into the modulator 122 a straight line. In an exemplary embodiment, the modulator 122 a straight line is a modulator of multiple access, code-division multiplexing, as described in detail in the aforementioned U.S. patent No. 5103459. The signal multiple access code division channels are then fed into the transmitter 120 a straight line (Pebls), which converts with increasing frequency, filters and amplifies the signal straight line and sends a signal through the switch 128 for transmission via the antenna 118.

The signal return line communications are received by the antenna 126 and served in the receiver 130 return line connection (Pras). The receiver 130 converts with decreasing frequency, filters and amplifies the received signal return line connection in accordance with the frequency band of the return line is istwa for demodulation of the return line connection mdcr described in detail in the aforementioned U.S. patent No. 5654979.

Signals direct line of communication transmitted from the base station 100, can also be the base station 104. When the base station 104 trained to perform the operation timing, the switch 128 is switched so that, instead of submitting data for transmission from the transmitter 120 direct communication line to the antenna 118 of the signals received by the antenna 118, served in a subsystem 150 of the receiver straight line. The receiver 134 a straight line (Pbls) converts with decreasing frequency, filters and amplifies the received signal return line connection in accordance with the frequency band of the straight line and delivers the received signal to the demodulator 136 straight line communication (PLC). In an exemplary embodiment of the invention the received signals contain the symbols of the pilot signal provided to facilitate retrieval of information and submitted for coherent demodulation of the traffic channels. A sample extracting the pilot signal of a straight line is described in detail in U.S. patent No. 5644591, entitled "Method and apparatus to perform information gathering search in the communication system MTCR".

The demodulated pilot signal from the demodulator 136 straight line connection element 138 sync settings. The item is nternet connection line to adjust its synchronization for synchronization between base stations 100 and 104.

Fig.2 illustrates a subsystem 150 of the receiver of the mobile station in more detail. Subsystem 150 of the receiver of the mobile station in the base station 104 attempts to align psevdochumoy signal generated by generator 206 PSH, signal direct line of communication received from the base station 100. In an exemplary embodiment of the invention, the generator 206 PSH generates PN-signals, PSHIand PSHQby linear shift registers with feedback that generate the PN sequence code for expansion and contraction of the pilot signals. Thus, the operation of obtaining synchronization between the codes used to compress the received pilot signal and extend PN code received pilot signal includes determining a time offset linear shift register with feedback in the oscillator 206 PSH.

The signal spread spectrum is served in the receiver 134 a straight line (Pbls). The receiver 134 converts with decreasing frequency, filters and amplifies the signal and delivers the signal in sample buffer 200. The buffer 200 delivers the received sample elements 202 and 204 compression. Elements 202 and 204 compression multiply the received signal PN code generated by the generator 206 PSH. Because of the nature of such random sumant synchronization.

The controller 218 of the device search delivers the hypothesis of a shift in the generator 206 PSH. The controller 218 of the device search determines the window to search for the pilot signal direct line of communication from the base station. In an exemplary embodiment of the invention, each base station is characterized by the set PN-offset from its neighboring base stations. In an exemplary embodiment of the invention the base station 104 knows specified PSH-shift between the pilot signal of the straight line and the pilot signal direct line of communication from the base station 100 (PSHattributes). In addition, the base station 104 knows the distance between base station 100 and the base station 104 (R). Thus, in an exemplary embodiment of the invention, the controller 218 of the device search puts his search for the pilot signal PN sequence (PNcenter) defined in accordance with the equation

PSHcenter=PSH104+PSHattributes+R/c, (1)

where PSH104- PSH-shift base station 104, and C is the speed of light. When centering the search Windows of the pilot signal at the location, where could be found the pilot signal, if the base station 100 and 104 would be synchronized, the deviation from the center of the search window is equal to the error sinhronizacioni connection of the modulator 122 a straight line fed to the controller 218 of the device search. The controller 218 of the device search promotes or retards the PN generator to compensate for a given phase shift between the extend code base station 100 and the base station 104. In addition, the controller 218 of the device search compensates for the propagation of the signal transmitted from base station 100 to the base station 104. Timing generator 206 PSH can be done by loading the data Bank of the branches of a linear shift register generator PSH or masking output for providing a shifted PN sequences, or a combination of these two methods, as is known in the art. This information is the initial phase to search for the pilot signal of the base station 100 is supplied from the controller 218 of the device search generator 206 PSH.

In an exemplary embodiment of the invention the received signal modulated by quadrature phase shift keying (FMC) so that the generator 206 PSH delivers the PN-sequence for modulation component I and a separate sequence for component modulation Q elements 202 and 204 compression. Elements 202 and 204 compression multiply PN-sequence to its corresponding component of the modulation and serves the product of the two output components in cognie along the length of the sequence works. Coherent accumulate adders 208 and 210 responsive to signals from the controller 218 of the device, search for reset, fixing and installation period summation. The amount of works and served from adders 208 and 210 in the tool 212 squaring. The tool 212 squared squares each of the sums and sums the squares together.

The sum of squares is served by means 212 squaring in a non-coherent integrator 214. Non-coherent integrator 214 determines the amount of energy output means 212 squaring. Incoherent accumulating adder 214 serves to counteract the effects of frequency mismatch between clock generators transmission base station and a clock generator receiving the mobile station and helps in the detection statistics in the environment with a sinking signal. Incoherent accumulating adder 214 sends a signal energy in the device 216 comparison. The device 216 comparison compares the energy value with a given threshold supplied by the controller 218 of the device search. The results of each comparison are then downloaded back to the controller 218 of the device search. The results are loaded back into the controller 218 of the device search, britanii controller device 218 search displays phase PSH, with which it is synchronized with the base station 100, item 138 sync settings. Element 138 configuration synchronization compares PSH-shift phase shift PSH-hypotheses generated in accordance with the synchronization signal from the modulator 106 a straight line, known delay of the route distribution and a specified phase shift between the PN sequences of the base stations 100 and 104. The error signal sync supplied from element 138 synchronization settings in the modulator 122 a straight line. In response modulator 122 a straight line adjusts its synchronization signal to generate its expansion signal a straight line.

In an alternative embodiment, described in ITU-R terrestrial radio access USM (universal mobile communication system) of the European Institute of standards means of communication (hereinafter broadband mdcr SMDR), a possible representation of the RTT describes how PSH-expansion, in which each base station uses a different generator PN-sequence (called a generator of the orthogonal code Golda). In order to facilitate the initial capture and transmission services, it is desirable to have a PN-sequence base stations, vyrovnal turn reduces the time of capture and reduces the likelihood of dropped calls during transfer service.

In accordance with the proposed format of the extension SMDR the synchronization signal from the modulator 122 direct lines of communication were submitted would be in the controller 218 of the device search. The controller 218 of the device search compensates for this synchronization signal in accordance with a known delay route propagation from the base station 100 to the base station 104. This provides the reference signal phase is used to initialize the generator 206 PSH. The generator 206 PSH can be loaded into the database in accordance with the shift synchronization. The main difference between the synchronizing system on the basis of various extension functions and synchronization systems based on shifts of a single function expansion is that these systems are based on different functions of the expansion would require additional operations to retrieve the reference time signal from the received extension function, which is the time relative to the known phase two extension functions.

II. Transmission from the base stations on the frequencies of mobile stations

An alternative to disabling transmission base stations and the detection gear neighboring b is Adachi the mobile station. Usually transfer the mobile station mdcr near the base station are performed with very low power, but these short transmission may be of sufficient power to reach the neighboring base stations. During the time interval during which the base station transmits in the frequency band of the reverse link, the receiver return line connection in the base station is not able to demodulate signals a return line connection from the mobile stations in the service area of a base station. In addition, on the other, close to the base station could adversely affect the transmission return line connection from the base station, and the result could be the destruction of the frames. When you turn off the base station that would take place not often, so that would be affected minimally to overall system performance.

Requires the planning of these programs to ensure that all base stations knew what time to search for a pilot signal synchronization. Base station to be synchronized, you could request this measurement of probe signal performed by the neighboring base stations. Data indicating the synchronization of the base station, then used with the known distance between the bozos who I synchronization errors are then used to adjust the synchronization of the various base stations in the network.

As with the approach off the base station, a reserve for transmitting a test signal from the base station in the base station must be sufficient to overcome the additional losses of the route because of the larger distances. It is expected the same increase in the loss of route 10 or 11 dB and the same attenuation factors discussed above, are used in this approach. If we assume that the base station uses a standard power amplifier for a mobile station (~200 mW) for your transmitter, the approach off the base station has a larger margin of control line provided that the pilot signals of the base station is usually transmitted by 10-20% amplifier high power (UBM) of a base station, i.e., the pilot signal is transmitted at approximately 1-4 watts. However, the factors discussed above, are substantially higher than the difference in magnitude of the power amplifier, so for most networks also could be used another way.

Fig.3 illustrates a second exemplary variant embodiment of the invention to synchronize the time between two base stations, the base station 300 and the base station 304. As described previously, the signals straight line connection of the front is the version of the invention the signals straight line and signals the return line is the signal multiple access, code-division multiplexing (mdcr).

As described above, the base station 300 knows when to look for a test sequence from the base station 304. One way to provide this information to the base station 300 is sending the base station 304 a request message to the base station controller (not illustrated), which is connected with the base station 300 and base station 304. In response to the request message from the base station 304, the controller of the base station generates a message to schedule a test signal indicating the time at which the test signal should be transmitted to the base station 304, and sends this message to the base station 300. The difference between the scheduled time for receiving the test signal at the base station 300 and the time at which the base station actually receives a test signal from the base station 304 is equal to the time error in the base station 300 based on the assumption that the clock synchronization in the base station 304 is correct.

The base station 304 contains all the schema required for normal operation. In addition, the base station 304 has the ability to send messages to the bandwidth of the reverse link, at the same time preventing the signal return line. In the base stantsionarom embodiment of the invention the modulator 322 a straight line is a modulator of multiple access, code-division multiplexing, which is described in detail in the aforementioned U.S. patent No. 5103459. The signal multiple access code division channels are then fed into the transmitter 320 a straight line (Pebls), which converts with increasing frequency, filters and amplifies the signal straight line connection for transmission via the antenna 318.

The signal return line communications are received through the antenna 326 and fed through a switch 324 in the receiver 330 return line connection (Pras). The receiver 330 converts with decreasing frequency, filters and amplifies the received signal return line connection in accordance with the frequency band of the return line and delivers the received signal to the demodulator 332 return line connection (ARS). An exemplary variant of the method and device for demodulation of the return line connection mdcr described in detail in the aforementioned U.S. patent No. 5654979.

When the base station 304 is ready to transmit a test signal synchronization on the reverse link lines in the base station 300, the switch 324 is switched so that instead of feeding back data received in the antenna 326, the receiver 330 to transmit data served by switch 324 of the transmitter 352 return line connection (Perals) in the antenna 326. Toggle switch 324 does not allow receiving messages saturaday damage technical support receiver in the base station 304 signal, transmitted from the base station 304 over a reverse link.

At the appointed time tbeforeelement 350 sync outputs a start signal to the generator 337 messages and the switch 324. Switch 324 is switched in response to a start signal from element 350 synchronization. In response to a start signal from element 350 sync generator 337 messages (HS) generates the given sequence which is fed to the transmitter 352 return line connection (Perals). The transmitter 352 return line connection (Perals) transforms with increasing frequency, filters and amplifies the signal. The signal issued by the transmitter 352 return line, is fed through the switch 324 for transmission via the antenna 326.

In the base station 300 symbols of the pilot signal and traffic data are fed into the modulator 306 straight line communication (PLC). In an exemplary embodiment of the invention the modulator 306 a straight line is a modulator of multiple access, code-division multiplexing (mdcr), which is described in detail in the aforementioned U.S. patent No. 5103459. The signal mdcr then fed into the transmitter 308 a straight line (Pebls), which converts with increasing frequency, filters and amplifies the signal straight line relation for p is fed into the receiver 314 return line connection (Pras). The receiver 314 converts with decreasing frequency, filters and amplifies the received signal return line connection and delivers the signal through switch 315 in the demodulator 312 return line connection (ARS). An exemplary variant of the method and device for demodulation of the return line connection mdcr described in the aforementioned U.S. patent No. 5654979.

At the appointed time, the switch 315 is switched to submit data back to the communication line through switch 315 in a consistent filter (SF) 315. In an exemplary embodiment of the invention the appointed time for switching of the switch 315 (tswap) will be determined in accordance with the equation

tswap=tbefore+R/c-twindow/2, (2)

where tbefore- the scheduled time for transmission of the pilot signal from the base station 304, R is the distance between base station 300 and the base station 304, C is the speed of light, and twindow- function tasks window, through which the base station 300 will look for a test signal from the base station 304.

At the appointed time of the switching signal is fed through switch 315 in a consistent filter 317. In the first embodiment, selector switch 315 315 continues submitting the mouse to turn communication into a coherent filter 317. If the test signal is transmitted with sufficient power, then the reverse link, in essence, is interrupted during transmission, the switch 315 can for some period to prevent the signal return line connection in the demodulator 312 return line connection.

Consistent filter 317 is designed to maximize the relationship capacity signal-to-noise ratio at its output for a given transmitted sequence. The implementation of the matched filter 317 is well known in the art. Two ways to implement a matched filter 317 include using a matched filter based on the convolution and the matched filter on the basis of the correlation. The function of the matched filter 317 is output high power, when receiving a given sequence.

The output signal of the matched filter 317 is supplied to the detector 319 energy. The detector 319 energy detects the reception of the test signal synchronization identification of a sufficiently high correlation energy of the matched filter. After detection of the reception of the test signal synchronization detector 319 energy sends a signal to the element 321 sync settings. Element 321 Astragal receiving a test signal from the base station 304, as described previously, the difference indicates a synchronization error between the base station 300 and the base station 304. Signal synchronization configuration is served from an element 321 synchronization settings in the modulator 306 a straight line. In response to the signal synchronization settings are configured internal clock generators, the base station 300.

III. The use of fixed stations for the measurement of transmission base stations

The problem arises with the above method, when there is a base station that can't see any other base station. For example, a base station in the metro can be isolated from all other base stations, but still able to receive signals from mobile stations that are in the transfer to other base stations. Indeed, the signals should be around a very sharp corner in order to pass from one base station to another mobile station in a suitable location capable of receiving signals from both base stations.

In order to cover those cases where there is no route propagation between a base station is a fixed dummy station, which delivers the measurement phase of the pilot signal is ogenyi, evaluation of the synchronization errors between the two base stations can be performed while the fixed dummy station can measure the pilot signals from both base stations and report the measurement results in one of the base stations. The base station uses the distance from the base station to the fixed dummy station together with a relative delay of the pilot signal communicated in the message to determine its timing relative to another base station.

It is difficult to put a fixed dummy station in the zone in which the base stations are close to the same power level, then it may be necessary to use off closer to the base station in order to measure the latency for both base stations. In order to accomplish this, the base station sends the command to the fixed dummy station to perform two measurements of the pilot signal, one before shutting down, the other during shutdown. Combining the information in these measurements is then equivalent to a single measurement made on two pilot signals at the same time.

The efficiency of the fixed dummy stations depends on the relative measured levels of the base station pilot signal is equal to -17 dB Ec/Iabout. In order to obtain a probability of detection of 90% at the sinking of the beam and the frequency of false alarm of 10%, the required SNR (signal to noise) 21 dB, hence the need to integrate over 6000 elementary signals. It is approximately 5 msec at a frequency of elementary signal of 1.23 MHz. If another base station 20 decibels stronger then requires integration within 50 msec. Coherent integration within 50 msec, probably for a fixed dummy station, but definitely requires significant processing in order to consider various hypotheses delay. The permissible level of coherent integration determines how close must be consistent loss of the route between the two base stations to eliminate requirements off the neighboring base station.

Fig.4 illustrates the case when there is no route distribution between base stations. The obstacle 400 block any route propagation between the base station 402 and the base station 404. To resolve the issue of lack of route distribution between base stations 402 and 404, the fixed dummy station is chtobi station 404 and the fixed dummy station 406. As the fixed dummy station 406 is stationary and is in a known location estimation errors of synchronization between base stations 402 and 404 can be made up until the fixed dummy station can measure the phase signals a direct line of communication from both base stations 402 and 404 and to report the results of measurements in one of the base stations.

In the base station 402 symbols of the pilot signal and the characters of the traffic served in the modulator 408 straight line communication (PLC). In an exemplary embodiment of the invention the modulator 408 a straight line is a modulator of multiple access, code-division multiplexing, which is described in detail in the aforementioned U.S. patent No. 5103459. The signal multiple access code division channels are then fed into the transmitter 410 a straight line (Pebls), which converts with increasing frequency, filters and amplifies the signal straight line connection for transmission via the antenna 412. The signal return line communications are received via the antenna 414 and served in the receiver 416 return line connection (Pras). Receiver 416 converts with decreasing frequency, filters and amplifies the received signals a return line connection in accordance with the frequency band of the a and device for demodulation of the return line connection mdcr described in the aforementioned U.S. patent No. 5654979.

Similarly, in the base station 404 symbols of the pilot signal and the characters of the traffic served in the modulator 420 straight line communication (PLC). In an exemplary embodiment of the invention the modulator 420 a straight line is a modulator of multiple access, code-division multiplexing, which is described in detail in the aforementioned U.S. patent No. 5103459. The signal multiple access code division channels are then fed into the transmitter 422 a straight line (Pebls), which converts with increasing frequency, filters and amplifies the signal straight line connection for transmission via the antenna 424. The signal return line communications are received through the antenna 430 and served in the receiver 428 return line connection (Pras). The receiver 428 converts with decreasing frequency, filters and amplifies the received signals a return line connection in accordance with the frequency band of the return line and delivers the received signal to the demodulator 426 return line connection (ARS).

Signals direct line of communication from both base stations 402 and 404 are received by the antenna 432 fixed dummy station 406. The signal is fed through duplexer 434 in the receiver 436 (PR). The receiver 436 converts with decreasing frequency, filters and amplifies the signal in accordance with the frequency of the shift signals a straight line, transmitted by base stations 402 and 404. In an exemplary embodiment of the invention signals a direct line of communication include many symbols of the pilot signal that can be used for easy capture signals direct line of communication from the base stations 402 and 404.

PSH-shifts the received signals of the straight line are fed into the generator 440 messages. Generator 440 message generates a message indicating PSH-shifts the received signals from the base stations 402 and 404, and sends a message to the modulator 442. In an exemplary embodiment of the invention the modulator 442 is a modulator mdcr, which is described in detail in U.S. patent No. 5103459.

In an exemplary embodiment of the invention the message is transmitted as a pilot signal to access the access channel or base station 402 or the base station 404. Generating a signal access is well known in the art. In an exemplary embodiment, channel access mdcr based on IS-95 pilot signal access is at first covered by using the specified length PN sequence, which is known to the base station and the fixed dummy station 406. In an exemplary embodiment of the invention the test signal is then covered with and access to the communication system mdcr described in detail in U.S. patent No. 5544196, entitled "apparatus and method reduce conflicts of messages between mobile stations simultaneously accessing a base station in the cellular system MTCR".

In an exemplary embodiment of the invention the test signal access, carrying information about PSH-shift of the detected pilot signals from base stations 402 and 404, is accepted by either the base station 402 or the base station 404. In an exemplary embodiment of the invention the test signal access is transmitted to the base station 404. In the base station 404 a test signal from an antenna 430 and fed into the receiver 428 return line connection (Pras). The receiver 428 converts with decreasing frequency, filters and amplifies adopted a test signal in accordance with the bandwidth of the reverse link. The received signal is then fed to the demodulator 424 return line connection (ARS), which demodulates the pilot signal and extracts the measured phase PSH-shifts.

The measured phase PSH-shifts are served in the control processor 446. Control processor 446 calculates the relative error in synchronization between the base station 404 and the base station 402, as described in connection with equation (1) above. The calculated change to sincei 404 in synchronization with a clock generator of the base station 402 in response to the computed set up sync.

Perform the necessary synchronization settings in the base station provides quick setup for synchronization. In an alternative embodiment of the invention the base station 404 may send information to the test signal access back to a Central controller, such as controller base station (not illustrated). The necessary calculations can then be performed in the base station controller, and the necessary shift synchronization can then be passed back to the base station. This variant embodiment of the invention has an additional factor in providing opportunities for joint evaluation of information from many base stations, and a wide system synchronization can be performed in fewer cases.

IV. The use of fixed stations to transmit test signals to the base station,

Fixed dummy station can also be used to transmit pilot signals on command. These pilot signals are transmitted at a power level sufficient to achieve the desired set of the neighboring cell, which should be set up to sync. As well as when measuring mobile station described above, the time error is estimated and the new mobile station.

Referring to Fig.5, when it should be synchronized between the base station 502 and the base station 504, the request message transmitted to the mobile station 506. The request message of the test signal in a fixed dummy station antenna 506 542. The received signal is fed through duplexer 544 in the receiver 546 straight line (Pbls). The receiver 546 converts with decreasing frequency, filters and amplifies the received signal in accordance with the bandwidth of the reverse link. The received signal is fed to the demodulator 548, which demodulates a received signal and detects the reception of a request message of the test signal.

After receiving a request message test signal demodulator 548 delivers a start signal to the generator 550 messages. Generator 550 messages generates the given sequence and delivers the sequence in the transmitter 552 (Per) return line connection. The transmitter 552 converts with increasing frequency, filters and amplifies the signal in accordance with the frequency band of the return line and sends a signal through duplexer 544 for transmission antenna 542.

In the base station 504 test signal from an antenna 540 and fed into the receiver 538 return line connection (Pras). The receiver caveny filter 536. Consistent filter 536 generates an output signal whose energy is proportional to the correlation of the expected pilot symbol sequences with the accepted sequence of characters. Values of energy are served in the control processor 534. After the discovery of a trial sequence control processor 534 sends a signal to the controller 506 of the base station, indicating the time of reception of a test sequence from a fixed dummy station 506.

Likewise, the base station 502 test signal from an antenna 518 and fed into the receiver 520 return line connection (Pras). The receiver 520 return line converts with decreasing frequency, filters and amplifies the signal and delivers the signal in the coherent filter 522 (SF). Consistent filter 522 generates an output signal whose energy is proportional to the correlation of the expected pilot symbol sequences with the accepted sequence of characters. Values of energy are served in the control processor 534. After the discovery of a trial sequence control processor 534 sends a signal to the controller of the base station, indicating the time of reception of a test sequence from a fixed dummy station 506. The controller of the base station is their correction synchronization in the base station 504 and 506 in accordance with equation (2).

In the base station 502, the signal correction of synchronization errors is taken control processor 524, which sends a signal configuration of the synchronization clock generator 516. Customized clock signal generator is then used by the modulator 510 direct lines of communication in generating PN sequences used to expand the external data. Symbols of the pilot signal and the characters of the traffic supplied to the modulator 510 a straight line extended in accordance with PN-sequences determined in accordance with the adjusted clock signal generator. Advanced signal in the receiver 512 straight line (Pbls). Receiver 512 converts with increasing frequency, filters and amplifies the signal in accordance with the frequency band of the straight line and delivers the resulting signal to the antenna 514 for transmission.

Similarly, in the base station 504, the signal correction of synchronization errors is taken control unit 534, which sends a signal configuration of the synchronization clock generator 532. Customized clock signal generator is then used by the modulator 530 direct line communications (PLC) in generating PSH-after is presented in the modulator 530 direct communication line, expanded in accordance with PN-sequences determined in accordance with the adjusted clock signal generator. Advanced signal in the transmitter 528 straight line (Pbls). The transmitter 528 converts with increasing frequency, filters and amplifies the signal in accordance with the frequency band of the straight line and delivers the resulting signal to the antenna 526 to send.

V. Fixed repeater

The fifth implementation of the present invention to synchronize the base station includes the use of a simple relay. As with fixed dummy station of the methods described above, the relay is located so that it can receive signals from two or more base stations.

The repeater periodically converts into digital form and stores the received signals in a straight line within a short period of time and re-transmits these samples on the reverse link. Thus, the repeater receives a snapshot of the transmission of the pilot signal of the base station, which can be used to determine the relative synchronization of base stations. Instead of handling this information in the repeater,trojstva low power. The repeater can also just convert the frequency of the incoming signal direct lines of communication and re-transmit through a return line connection without memorizing the signal. This requires a repeater to receive and transmit at the same time, but eliminates the requirement of a/d (analog-digital) conversion and storage of the samples.

The relay is usually not synchronized with the system mdcr. For ease of processing in the base station (stations) for detecting transmission relay transmission is performed at fixed intervals (e.g. every 10 minutes or so). The ambiguity in synchronization pulse is just because of an error in the clock generator relay during the time between transmissions. When the accuracy of the clock generator 310-7(a good crystal oscillator with temperature stabilization (KGTS) low power) drift equal to only 180 μs every 10 minutes.

In order to further simplify the search for the base station, the relay sends its data packet at an acceptably high level of power. This is the result of a slight deterioration in the efficiency of the system, because it does not happen often. The transfer can continue KOR is ugen simple agreed upon by the filter in the base station.

Referring to Fig.6, base station 602 symbols of the pilot signal and the characters of the traffic served in the modulator 608 straight line communication (PLC). In an exemplary embodiment of the invention the modulator 608 a straight line is a modulator of multiple access, code-division multiplexing, which is described in detail in the aforementioned U.S. patent No. 5103459. The signal multiple access code division channels are then fed into the transmitter 610 a straight line (Pebls), which converts with increasing frequency, filters and amplifies the signal straight line connection for transmission via the antenna 612. The signal return line communications are received through the antenna 614 and served in the receiver 616 return line connection (Pras). The receiver 616 converts with decreasing frequency, filters and amplifies signals a return line connection in accordance with the frequency band of the return line and delivers the signal through the switch 617 in the demodulator 618 return line connection. An exemplary variant of the method and device for demodulating signals mdcr described in the aforementioned U.S. patent No. 5654979.

Likewise, the base station 604 symbols of the pilot signal and the characters of the traffic served in the modulator 620 straight line communication (PLC). In an exemplary embodiment, Khujand is split calow, which is described in detail in the aforementioned U.S. patent No. 5103459. The signal multiple access code division channels are then fed into the transmitter 622 straight line (Pebls), which converts with increasing frequency, filters and amplifies the signal straight line connection for transmission via the antenna 624. The signal return line communications are received through the antenna 630 and served in the receiver 628 return line connection (Pras). The receiver 628 converts with decreasing frequency, filters and amplifies signals a return line connection in accordance with the frequency band of the return line and delivers the received signal to the demodulator 626 return line connection.

Signals direct line of communication from both base stations 602 and 604 are received by the antenna 632 fixed dummy station 606. The signal is fed through duplexer 634 in the receiver (PR) 636. The receiver 636 converts with decreasing frequency, filters and amplifies the signal in accordance with the frequency of the reverse link. Received signals are fed into an analog-to-digital Converter 638 (a/d). Converted to digital samples of a received signal are served in the d / a Converter 640 (C/A). D / a Converter 640 converts the received converted into a digital form vyborotchnye to digital samples are fed into the transmitter 642 (Per), which converts with increasing frequency, filters and amplifies the signal in accordance with the frequency band of the return line and sends a signal through duplexer 634 for transmission via the antenna 632.

In an exemplary embodiment of the invention, the packet transmission from the fixed dummy station 606, which performs frequency conversion of the received converted to digital samples in the frequency band of the straight line is taken by either the base station 604, or the base station 602. When a test signal is received at the base station 602, a test signal from an antenna 614 and fed into the receiver 616 return line connection (Pras). The receiver 616 converts with decreasing frequency, filters and amplifies adopted a test signal in accordance with the bandwidth of the reverse link. In a given time interval, when will you be getting a test signal, the switch 617 delivers the signal to the device 619 search.

The device 619 search determines the relative phase of the transmission base stations that are transmitted by the relay 606.

The device search PSH needs to examine the signal for a window around the expected time of transmission of the relay as the relay is not synchronized with the remains of the search operation direct communication line, as described with regard to the demodulator 136 straight line connection of the first variant embodiment of the invention. The device 619 search detects the phase signals a straight line from the base stations 602 and 604. In an exemplary embodiment of the invention the device 619 search detects the phase shift of the pilot signals from base stations 602 and 604.

The device 619 search delivers the detected phase signals direct communication line to the control processor 650, which calculates the configuration required to synchronize the internal clocks of the base stations 602 and 604. This setting synchronization is applied at either the base station that performed the search, or is sent to the base station controller through a return line connection for transmission to the base station 604.

If you configure synchronization must be performed by the base station 602, the control processor 650 calculates the change for internal synchronization of the base station 602 and sends a signal indicating this change in clock generator 652. The oscillator 652 adjusts its synchronization in accordance with this signal, and the modulator 608 direct communication line uses the configured clock generator when the modulation signal is a straight line Leumi processor 650 calculates the change for internal synchronization of the base station 604 and sends a signal, indicates the change in the controller 654 base station. The controller 654 base station sends a message indicating the setting of the synchronization control processor 646 base station 604. Control processor 646 sends a signal to the clock generator 648, in response to which configures the synchronization clock generator 648. Clock generator 648 adjusts its synchronization in accordance with this signal, and the modulator 620 direct communication line uses the configured clock generator when the modulation signal is a direct line of communication from the base station 604.

The previous description of the preferred embodiments of the invention are provided to enable any person skilled in the art to make or use the present invention. Various modifications of these embodiments of the invention will be obvious to experts in the field of technology and the General principles defined in the present description can be applied to other variants of the invention without the use of inventive ability, thus, it is understood that the present invention is not limited to variants of the implementation is the thymoma with the principles and novel traits, disclosed in the present description.

Claims

1. A system for synchronization of clocks of the first base station and second base station in a wireless communication system for providing two way communication between multiple base stations and multiple mobile stations, and the set of base stations transmitting data to multiple mobile stations in the frequency band of the straight line, and many mobile stations transmits information in the set of base stations in the frequency band of the reverse link, containing the first base station from the multiple base stations to transmit the first wireless signal in the first subset of the multiple mobile stations in the frequency band of the straight line and the second base station from the multiple base stations to transmit the second wireless signal to the second subset of the multiple mobile stations in the frequency band of the straight line, prohibition of transmission of the second wireless signal during the control period and receiving the first wireless signal in the period of the control period and for setting the internal clock generator in accordance with the first signal is at the receiver the inverse of the communication line for receiving signals from the mobile station in the frequency band of the reverse link, the receiver subsystem direct communication line to receive a signal from the first base station in the frequency band direct lines of communication and a means of synchronization settings to configure the internal clock generator in accordance with the received signal straight line.

3. The system under item 2, characterized in that the second base station subsystem further comprises transmitting a direct communication line to transmit a signal in the frequency band of a straight line.

4. The system under item 3, characterized in that the second base station further comprises a switch for prohibiting transfer by the transfer subsystem straight line, while the above-mentioned receiver straight line receives a signal from the first base station.

5. The base station containing the receiver subsystem return line for receiving signals from the mobile station in the frequency band of the reverse link, the receiver subsystem direct communication line to receive a signal from the first base station in the frequency band of the straight line configuration tool sync to set the internal clock generator in accordance with the received signal straight line, the transfer subsystem direct communication line to transmit a signal in the band cha is EMA as mentioned receiver straight line receives a signal from the first base station.

6. A system for synchronization of clocks of the first base station and second base station in a wireless communication system for providing two way communication between multiple base stations and multiple mobile stations, and the set of base stations transmitting data to multiple mobile stations in the frequency band of the straight line, and many mobile stations transmits information in the set of base stations in the frequency band of the reverse link, containing the first base station from the set of base stations for receiving signals from a subset of the multiple mobile stations in the frequency band reverse lines of communication and to send a wireless signal back to the communication line in the frequency band of the inverse of the communication line during the synchronization interval and the second base station for receiving the above-mentioned wireless signal return line connection and to configure the internal clock generator in accordance with the received wireless signal, and the first base station transmits signals in the frequency band direct communication line, receives the signal from the mobile station in the frequency band of the reverse link, transfers mentioned the wireless signal in the frequency band obratno line.

7. The system under item 6, characterized in that the first base station transmits a wireless signal at a specified time and the second base station configures the internal clock based on the time of receipt of the above-mentioned wireless signal.

8. The system under item 7, characterized in that the first base station includes a transfer subsystem direct line of communication to transmit signals in the frequency band direct line of communication subsystem receiving a return line for receiving signals from mobile stations in the frequency band of the return line and the transmitter subsystem return line connection for transmission of the above-mentioned wireless signal in the frequency band of the reverse link.

9. The system under item 8, characterized in that the first base station further comprises a switch for prohibiting reception of the above-mentioned signal from said mobile station, while the said reverse transmitter of the communication line transmits in the frequency band of the reverse link.

10. The base station containing the transfer subsystem direct line of communication to transmit signals in the frequency band direct line of communication subsystem receiving a return line for receiving the signal from the mobile station in-band Consoli in the band return line connection and switch to deny receiving the above signal from said mobile station, while the above-mentioned transmitter reverse communication line transmits in the frequency band of the reverse link.

11. A system for synchronization of clocks of the first base station and second base station in a wireless communication system for providing two way communication between multiple base stations and multiple mobile stations, and the set of base stations transmitting data to multiple mobile stations in the frequency band of the straight line, and many mobile stations transmits information in the set of base stations in the frequency band of the reverse line containing the first base station to transmit a first wireless signal in the frequency band of the straight line, the second base station to transmit the second wireless signal in the frequency band of the straight line and a dummy station, having a fixed location, for receiving the first wireless signal and receiving the second wireless signal and to generate a signal indicating synchronization of the first base station and synchronization of the second base station.

12. System on p. 11, wherein the dummy station contains a transmitter for transmitting the above-mentioned signal, the .12, wherein the dummy station includes a device for measuring a phase of the first wireless signal and the phase of the second wireless signal and the dummy station generates a signal indicating synchronization of the first base station and synchronization of the second base station in accordance with the phase of the first wireless signal and the phase of the second wireless signal.

14. The system under item 12, characterized in that the first base station and second base stations are base stations of multiple access, code-division multiplexing, and the first wireless signal and the second wireless signal are signals of multiple access, code-division multiplexing.

15. The system under item 14, characterized in that a dummy station includes a device for determining the phase shift of pseudotumor extension of the first wireless signal and the second wireless signal and the signal indicating the synchronization of the first base station and synchronization of the second base station is determined in accordance with a phase shift pseudotumor extension of the first wireless signal and the second signal wirelessly tie is containing a series of dummy station, having a fixed location, to send a wireless signal, the first base station for receiving the above-mentioned wireless signal and to calculate the time of receipt of the above-mentioned wireless signal at the first base station and to send a message indicating the time of receipt of the above-mentioned wireless signal at the first base station, to the Central controller, the second base station for receiving the above-mentioned wireless signal and to calculate the time of receipt of the above-mentioned wireless signal to the second base station and to send a message indicating the time of receipt of the above-mentioned wireless signal to the second base station, to the Central controller, a Central controller for generating a message synchronization settings in accordance with said message indicating the time of receipt of the above-mentioned wireless signal at the first base station, and the said message indicating the time of receipt of the above-mentioned wireless signal to the second base station, and to send the above message synchronization settings in the first base station.

 

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FIELD: communications engineering.

SUBSTANCE: proposed method enables user to immediately listen to return-call signaling tone as result of immediate execution of dialing in terminal of local radio communication line when user enters pulse signal by means of telephone hook upon dialing on standard telephone set connected to terminal of local radio communication line. Method involves checkup of telephone hook of standard telephone set connected to terminal of local radio communication line for condition. When telephone hook is found to be in off-position, telephone number is checked for dialing. If it is found that telephone number has been dialed, this number is stored in dialing buffer. Pulse signal is continuously checked for entering when dialing buffer stores telephone number. As soon as pulse signal is entered, telephone number stored in dialing buffer is conveyed to base station of local radio communication line.

EFFECT: enlarged functional capabilities.

5 cl, 2 dwg

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