Improvements in the measurement of the observed time difference downlink

 

Mobile stations (MS) in a wireless communication network is used for measuring respective times of receipt of radio signals respectively transmitted by multiple transmitters in the network. Mobile station link information is provided to the difference of real-time pointing (eres) difference between synchronization used by the radio transmitter serving the mobile station communication, and relevant synchronizations used by other radio transmitters. The mobile station identifies in response to the difference between the real time and with respect to synchronization used by the radio transmitter serving the mobile station communication, the set of times in which it is expected that the respective radio signals in a mobile communication station. For each radio mobile station communication monitors the incoming signal over a period of time after the point in time at which it is expected signal, which is achievable technical result. 6 C. and 40 C.p. f-crystals, 8 ill.

The technical field to which the invention relates the Invention relates generally to the detection mestopolozhenii the time difference downlink.

The prior art the Ability to detect the location of the mobile communication device operating in a wireless communication system (for example, the cellular system), provides many well-known advantages. An exemplary use of this ability for detecting the location include application security, application response in an emergency situation and application of the leadership journey. Several well-known methods to detect the location include the measurement of certain characteristics of communication signals, such as time of receipt (RR), delays due to signal flow in forward and backward directions or angle of receipt of the communication signal. Some of these methods can be further divided into approaches uplink communication or downlink. In the category of uplink communication base transceiver station (BPS) or other receiver performs measurements on signals of communication that occur in a mobile communication device (or mobile station). Approaches downlink mobile station performs measurements on signals in base transceiver stations or other transmitters.

One example of spanoli time (NRV). This method will now be described in relation to the global system for mobile communication (GSM), which is an example of a cellular communication system, in which the applicable methods observed time difference downlink. The way NRW implemented, for example, by measuring at the mobile station, the time difference between the times of receipt of the selected radio signals transmitted from different base transceiver stations. Assuming the geometry depicted in Fig. 1, and additionally assuming that the two signals are simultaneously transmitted from the base transceiver stations BPS and BPS, and assuming that T1 and T2 denote the times of receipt of the corresponding signals in the mobile station, then the observed time difference NRW is defined by the following equation: T1-T2 = (d1-d2)/c, (1) where d1 and d2 are the respective distances from BPS and BPS to the mobile station. Location BPS and BPS known, and the possible location of a mobile station are described by hyperbole 15, shown in Fig.1. By combining measurements from at least three base transceiver stations can be obtained to assess the location of the mobile station.

The most traditional cellular communication system (included internal reference clock to generate its structure frame and time frame. Therefore, the structure of frames of different base transceiver stations will have a tendency to shift in time relative to each other, because the clocks are not perfectly stable. As a result, the measurement NRW has not really make sense for detecting the location of a mobile station up until not known difference in synchronization between the base transceiver stations. This difference is often called the difference between real-time (eres), represents the actual difference in absolute time between the transmission of the corresponding signals (e.g., corresponding to the burst synchronization in GSM) from the respective base transceiver stations, these signals would be transmitted at the same time, if the frame structure of the base transceiver stations would be perfectly synchronized.

Among several possible approaches for determining the difference between the real time eres between base transceiver stations two traditional examples are: the printing of absolute time in the respective base transceiver stations and the fixed support mobile stations located in from the IDE, sent from different base transceiver stations. As the respective distances between the various base transceiver stations and stationary reference mobile station is known, the expected time difference in time of receipt of appropriate signals from the base transceiver stations can be easily calculated. The difference between the real-time eres between the base transceiver station is just equal to the difference between the expected difference between the receipt time and observed time difference of arrivals, in fact, observed in the bearing of the mobile station. Anchor mobile station may periodically measure the time of receipt on the downlink and report them to the node detecting the mobile station in the network so that the network could maintain updated record of the differences in real time.

The methods underlying the known methods NRW, very similar to the procedures used traditionally mobile stations for synchronization with the serving base transceiver station, and perform measurements on a number of neighboring base transceiver stations, which receive commands serving cell of the cell (as in operations per what their station should be monitored for measurements NRW. This information can usually be provided in the normal informational messages sent by cell cell, for example, at the frequency of the CABINET (wideband control) cell GSM cell. This system usually includes a list of frequencies of the neighboring cell, which must be measured. The mobile station scans the assigned frequency for detection pulse packet to the correct frequency, which is easily identifiable bundle of pulses appearing approximately every 50 MS in GSM.

After successful detection of the pulse packet to correct the frequency of the mobile station knows that in GSM the next frame will contain a pack of synchronization pulses PS. Pack of synchronization signals SS contains the identification code of the base station (KIBS) and information indicating the frame number of the current frame in which you receive a pack of synchronization pulses PS. The mobile station measures the time of arrival of the pulse packet synchronization PS in the mobile station relative to synchronize its serving cell of the cell the mobile station. Now that the mobile station knows the structure of the frame adjacent base transceiver station relative to synchronizationevent to improve the accuracy. This procedure is repeated until, until all frequencies (i.e., all BPS) in the list will not be measured. The values of the observed difference between the time recorded by the mobile station, then transferred to the node detecting the mobile station in the cellular system, this node performs the positioning based on the values of the observed time difference value, the difference between the real time and geographical location of the base transceiver stations.

Because the mobile station does not know when there will be a bundle of impulses to correct the frequency (and, therefore, the following bundle of synchronization signals SS), the way of solving the "forehead" described above, namely, the control pulse packet to the correct frequency should be used.

The time required to capture the pulse packet synchronization will depend on the measurement mode. Measurement NRW can be performed, for example, when installing the call is made on ASK (stand-alone dedicated control channel) GSM, or during idle frames when the mobile station is in the call mode or during the interruption of the speech. For example, if the mobile station makes measurements in the call, then the mobile station can produce stogo, that particular pack of synchronization pulses will appear during the free frame of approximately 1 to 10, since the packet of pulses synchronization typically occurs once every ten frames in GSM. Thus, on average, will need 5 free shots, which means to 0.6 seconds on the base transceiver station. Thus, if you want to measure at least 6 neighboring base transceiver stations, you will need the average measurement time 3 or 4 seconds, which may be unacceptably long in many applications.

It is guaranteed that the mobile station measured a pack of synchronization pulses PS, if the mobile station captures and stores all signals (for example, all signals at the frequency of the CABINET BPS in GSM) for 10 consecutive frames. However, providing the mobile station storage and computing capacity to capture (and then processing the information of all signals in 10 consecutive frames is disadvantageously complicated.

In addition, in areas such as urban areas, characterized by high level of noise, and in rural areas with large distances between base transceiver stations, the probability of detection packs impulsivnosti signal-to-noise.

Also because of the low signal-to-noise is usually very difficult to decode KIBS in a stack of synchronization pulses PS. The probability of capture spurious emissions instead of the pulse packet synchronization PS, thus disadvantageously increasing in moments with a low signal-to-noise.

To detect mobile stations operating in a network that uses air interface multiple access, code-division multiplexing (mdcr), one known approach NRW downlink, which is proposed for standardization, use some common signals lookup cell cell provided in the network mdcr. This known approach NRW downlink hereinafter also referred to as the "offer" approach or method. Examples of traditional mobile communication systems that use air interface mdcr contain so-called broadband system mdcr (SMDR), as, for example, a universal mobile telecommunication system (USMS) ETSI (the European Institute of standards on telecommunication and system IMT-2000 (international mobile telecommunication-2000), ITU (international telecommunication Union). In such systems, the proposed method of positioning NRW descending line swayamprabha station, the mobile station stops all transmissions for to increase the possibility of the mobile station to detect the signals transmitted by the neighboring base transceiver stations. Certain signals are typically provided to search for a cell of the cell in the above-mentioned systems mdcr, namely, the first search code (PEP) and the second code search (BCP), also used in the implementation of the positioning NRW downlink.

During the free period (periods) of its serving base transceiver station, a mobile station uses a consistent filter, which is consistent with the first code search control panel, just as is done in conventional cell search cell. The control panel is usually transmitted by all base transceiver stations in the networks mdcr, as mentioned above. The control panel is equal to 256 elementary signals and transmitted to each base transceiver station once every time interval, that is, one-tenth of the time (every time interval of length 2560 elementary signals). Each beam of each base transceiver station within the audible range of the mobile station is the maximum in the signal at the output of the matched filter. In the normal discovery process maximum maximum. In the conventional cell search cell, the mobile station typically selects the most intense detected maximum. However, in the proposed method of positioning NRW downlink time of receipt (RR) of each detected peak is measured by the mobile station using conventional methods of measuring the time of receipt, thus the observed time difference (NRW) between the time of the receipt of the corresponding peaks can be calculated.

Each base transceiver station operating in the above-mentioned networks mdcr also usually sends the associated second code search (BCP), which contains a set of 16 codes located and transmitted in a specific order. 16 codes are transmitted sequentially, one code for one time interval, and each of the 16 codes are transmitted simultaneously with the control panel that is transmitted in this time interval. An exemplary conventional system mdcr mentioned above are 16 time slots per frame, thus, the full combination of the CPSU, including all 16 codes, repeats once every frame. The combination of PCO with her sixteen codes arranged in a certain order, determines among the many possible code groups one codbuy codes mdcr, and each base transceiver station uses one of the extending code of its associated code group.

For each base transceiver station within the audible range of the mobile station performing the proposed method of positioning NRW downlink, performs correlation temporary location of the maximum of the control panel base transceiver station 16 codes the combination of the CPSU, exactly as is done in conventional cell search cell. This correlation process typically uses a non-coherent combining. If the maximum is successfully correlated with the combination of the CPSU, then the correlation result indicates the code group associated with the base transceiver station, which created the maximum PEP.

Synchronization of the maximum of the panel (i.e., the measured VP and/or NRB) and the code group for each detected base transceiver station can then be communicated to the node detecting the mobile station in the network together with measurements of power and quality, made during the discovery process high alarm control panel and during the process of correlation PEP-BCP.

The node detecting the mobile station already knows the eres among the base transceiver stannary reference mobile station) and thus, he is within the range of uncertainty due to the unknown location of the mobile station when the mobile station must take the maximum of the control panel from any given base transceiver station. Using this information known to the control panel in combination with the above information, the synchronization of maximum power and quality, taken from the mobile station, the node detecting the mobile station can identify the base transceiver station corresponding to each maximum of the control panel. For example, if the location of the mobile station is known to within 4.5 km of the uncertainty range, this range corresponds to the 64 elementary signals. If the synchronization structure of one frame of potential base transceiver station is different from the synchronization patterns frame another potential base transceiver station in the same code group more than 64 elementary signal uncertainty, then the correct one of these base transceiver stations can always be determined. Assuming that the synchronization frame structure of each base transceiver station is random, the probability that any two baati real-time eres) 64 elementary signal or less equal 64/40960, since each frame contains 40960 elementary signals (16 intervals x 2560 elementary signals/time interval). Thus, the probability that the maximum generated one base transceiver station may be distinctive from the maximum, created another base transceiver station of the same code group equal to 99.8 per cent (1-64/40960). Other 0.2% situation can be handled more advanced schemes, for example, when using power measurements and selecting a base transceiver station, which gives the best fit in a traditional cost function in determining the location.

When each maximum of the panel agreed with the corresponding base transceiver station can be used information of the EAP and/or NRV in combination with known information eres, and known geographic locations of base transceiver stations to determine the geographical location of the mobile station.

The proposed method of determining the location NRW downlink has the following approximate disadvantages. Because synchronization neighbor (poslujivshih) base transceiver stations owl who should I handle correlation PEP-BCP throughout the free period (periods) of its base transceiver station. Thus, a coherent filter used in the detection of the maximum of the panel should find it unprofitable to work throughout the duration of the free period. Also, as the codes in combination BCP are different in each time interval, the mobile station must perform the correlation with several of the CPSU, and then to remember the results for non-coherent combining. This disadvantageously requires additional computing capacity and more memory.

Because processing of the correlation PEP-BCP must consistently follow the detection of the maximum of the control panel, the time of collection in the proposed approach NRW downlink may be unprofitable long. Also urban areas characterized by high levels of interference, and rural areas with large distances between the base transceiver stations can make difficult, and sometimes impossible to detect the control panel and BCP with sufficient probability.

Another problem is that the codes associated with different base transceiver stations, have a high correlation with each other, as the codes of the control panel are all the same, and since the 16 codes of each combination of the CPSU are the subset that is created from a set of 17 in the, because the same codes repeated in each frame. This disadvantageously increases the likelihood that the mobile station can correlate this maximum panel with an invalid combination of the CPSU, especially if the control panel from a powerful base transceiver station goes temporarily close to the control panel from the less powerful base transceiver station.

The PCT application WO 9635306 (Telecom Sec Cellular Radio LTD) describes a method for determining the location of a mobile device of a cellular communication system by determining the difference in synchronization between the transmission of the base stations measured at the mobile device, determining from the differences in synchronization of differences in the distance of the mobile device from each of the base stations and the output location of the mobile device from the differences in distance, determined in this way. Young manga does not disclose the use of information-difference synchronization to determine the search window dimensions, which simplifies the measurement of time intervals.

Thus, it is desirable, in view of the above, to improve the ability of the mobile station to detect signals downlink, used in the known approaches, the observed difference izvestnyh approaches the observed time difference downlink by providing improved sensitivity in the detection of communication signals downlink, used for measurements of the observed difference of time in the mobile stations.

A brief description of the drawings Fig. 1 schematically illustrates, as may be determined by the location of the mobile station using the measurement of the observed time difference downlink.

Fig. 2 is a block diagram of an exemplary wireless communications system with the capability of measuring the observed time difference downlink in accordance with the present invention.

Fig.3 illustrates one example of the relative difference in synchronization between base transceiver stations, such as shown in Fig.2.

Fig. 4 illustrates an exemplary structure of time intervals of frames Fig. 3.

Fig. 5 illustrates the approximate quarter of the bit structure of the time interval Fig.4.

Fig. 6 illustrates the relevant parts of the mobile station having the ability to measure the observed time difference downlink, in accordance with one embodiment of the present invention.

Fig. 7 illustrates how an exemplary control box downlink.

Fig.8 illustrates relevant parts of the mobile station, which has enabled the om implementation of the present invention.

The detailed description of Fig.2 illustrates one example of a relevant part of a wireless communication system having the ability to measure the observed time difference downlink in accordance with the present invention. As is shown in Fig.2, the switching center of the mobile communication SMC GSM is connected for communication with multiple base station controllers ASC, which, in turn, are connected to communicate with one or more base transceiver stations BPS. Base transceiver station configured to implement radio communication with multiple mobile stations MS via an air interface. Communication from SMC in MS through KBS and BPS are well known in the art.

Fig.2 also contains the center of detection of the mobile station CLC connected to communicate in both directions with the switching center of the mobile communication SMC using traditional transfer Protocol GSM signals. In Fig.2 the CLC may accept a request for locating the mobile station MS. Such a request is usually taken from the application 21 location connected to communicate with the CLC. Annex 21 location is mestopolojenie mobile station MS the CLC queries the network for in order thereby to determine the service BPS 23 (i.e., serving cell GSM cell), and decides what BPS should be selected for measurement of the observed time difference downlink.

The CLC may then generate a request message to determine the location for the mobile station MS indicating frequency and KIBS (KIBS traditionally existing networks, such as GSM) base transceiver stations selected for control, and the difference between the real time eres between service BPS and each of the selected BPS. The request message location can be transmitted from the CLC in MS through SMC, CBS, BPS and the air interface between BPS and MS. Because MS knows when will be received pulse packet synchronization of its own service BPS, MS can use the information eres to calculate approximately when packs of synchronization signals will be received from the selected neighboring BPS. This will be described in more detail later.

The above information may also be sent in MS as a special message, for example, during setup of the call. In addition, the above information may also be sent in MS periodically shirokopolosnaya NRW, taken from the anchor mobile station, as described above, or ERE may be filed in the CLC using other traditional methods.

Fig.3-5 illustrate the concept of the difference between real-time base transceiver stations in GSM networks, as for example, part of an exemplary GSM network Fig.2.

Fig. 3 illustrates the difference between real-time synchronization patterns of the frame a pair of base transceiver stations, indicated in Fig.3 as BPS and BPS. In GSM frames MDR (multiple access with time division channels) used by the base transceiver stations, numbered in duplicate circular configuration, with each cycle (also called hypercat) includes 2715648 frames, numbered as frame 0 to frame 2715647. In the example of Fig.3 frame 0 BPS overlaps in time with the frame 828 BPS.

Referring now to Fig.4, each frame mdcr in GSM is divided into eight time slots TS, numbered from the time interval 0 time interval 7. As is shown in Fig.5, each time interval GSM additionally divided into 625 quarters bits BW so that during each time interval are fully 625/4=156,25 bits. The real difference in frames mdvr BPS and BPS, TND - difference (TN2-TN1) between time intervals BPS and BPS and QND - the difference between the numbers of quarters bits BPS and BPS. For example, with reference to Fig.3-5, if the quarter bit 0 time interval 0 frame 0 BPS aligned in time with a quarter of the bit 37 time frame 6 frame 828 BPS, then the difference between the real-time eres between BPS and BPS is specified by the triplet (FN2-FN1, TN2-TN1, QN2-QN1), where FN2, TN2 and QN2 are a number of frame number of the time interval and number of quarters bits BPS, a FN1, TN1 and QN1 are the same parameters BPS. Thus, the triplet is (828-0, 6-0, 37-0), or simply (828, 6, 37).

When the mobile station MS takes from the CLC difference between real-time eres between its own serving base transceiver station, for example, BPS Fig.3, and the other base transceiver station on which it should perform measurement of the time of receipt in the downlink, for example, BPS Fig.1, a mobile station MS can use the triplet eres (FND, TND, QND) together with the known synchronization patterns frame (FN1, TN1, QN1) of a serving base transceiver station BPS to determine synchronization patterns frame BPS relative to synchronize structure of the frame BPS. The following calculations can QN1) in synchronization with BPS.

QN2 = QN1+QND (2) TN2 = TN1=TND+TND+(QN2' div 625) (3) FN2 = FN1+FND+(TN2' div 8) (4) FN2 = FN2' mod 2715648 (5)
In the above equations "div" represents integer division, a "mod" is the modulus n, where "x mod n" = the remainder when x is divided by n".

Pack of synchronization signals SS in GSM contains 78 encoded information bits and the specified 64-bit training sequence, as is well known in the art. 78 encoded information bits contain KIBS and the so-called reduced frame number, usually expressed in three parts T1, T2 and T3'. The usual relationship between the frame number (FN) pulse packet synchronization and parameters T1, T2 and T3 is the following:
T1 = FN div (2651) (6)
T2 = FN mod 26 (7)
T3 = FN mod 51 (8)
T3' = (T3-1) div 10 (9)
Thus, when the number of the current frame FN2 BPS calculated as shown above equations 2-5, then parameter T3 can be determined by substituting the FN2 in equation 8 above.

In conventional GSM packet synchronization pulses PS appears in the time interval 0 frames 1, 11, 21, 31 and 41 of the 51 human repetitive sequence of frames mdvr transmitted on the carrier CABINET (broadband control channel) base transceiver stations. Thus, T3 is, as mentioned above, the bundle of synchronization signals SS appears in the time interval 0 frames 1, 11, 21, 31, 41, 51 this human repetitive sequence, the following T3 (let's call it TP), which satisfies dependencies (T3-1) mod 10=0, denote the frame BPS, which will appear next pack of synchronization pulses PS. The corresponding frame number (let's call it FN2n) is then defined
FN2n = (AT2+DT3) mod 2715648, (10)
where DT3 = (T3n - T3) mod 51.

Now the parameters T1, T2 and T3' can be determined by substitution FN2n in equations 6 and 7 and the substitution TP in equation 9. In accordance with the GSM standard, the parameters T1, T2 and T3' together with KIBS can be expressed by using 25 bits. Bits KIBS can be determined from the information KIBS taken MS, and the bits representing T1, T2 and T3', can be determined from equations 6, 7 and 9. Mobile station MS can then be applied above 25 bits, a well-known encryption algorithm that is described in the GSM standard (specification GSM 05.03 ETSI), in order to generate from these 25 bits 78 coded bits in the packet of pulses synchronization.

Thus, the mobile station MS now knows in relation to synchronize structure of a frame of its own serving BPS number which always appears in the time interval 0, thus, the mobile station MS now knows exactly when a pack of synchronization signals will be transmitted BPS. In addition, the mobile station MS now also knows all 78 of coded bits together with all 64 training bits pulse packet synchronization. With knowledge of 142 bits, and not only 64 bits of the mobile station can achieve the best accuracy in measurement of the time of receipt than in the normal situation, which is known only 64 bits. In addition, with known 142 bits to the mobile station MS can be achieved in the environment with a significantly higher noise level the same accuracy, which could be achieved using 64 bits, in environments with lower noise levels.

Because the location of the mobile station MS with respect to a given neighboring BPS (for example, BPS Fig.2) is not known, the packet synchronization signals SS from this BPS will not flow into the mobile station MS at just the right time, which was calculated by the mobile station. Fig.7 illustrates one example of how can be defined the search box to surround the time in which to expect the receipt of a pulse packet synchronization in a mobile station MS. Let FN denotes the frame number of the next COP (PO2), the entry is to 10. MS knows when the corresponding PS (PO1) with the same frame number will come or could come from serving BPS. Let this time is denoted by t0 relative to the synchronization of the mobile station.

MS is around 71. The radius r of this circle, for example, can be defined by the radius of the cell of the cell or is derived from the magnitude of timing synchronization. Consider two extreme cases. One extreme case, when MS is 74. Then PO2 arrives in time t0 + RTD + d12/c, because the PS2 is distributed through dl2 longer than PO1. Another extreme case, when MS is 75. Then PO2 arrives at t0 + RTD + (d12-2r)/C. Thus, when the mobile station is between 75 and 74, the PS2 comes in the window [+RTD + (d12-2r)/C - k, t0 + RTD + d12/c + k], where k takes into account inaccuracies in the provided values eres, and d12.

Since eres known MS can predict with a certain uncertainty, when you receive a PO2 of BPS (posluzhivshij).

The ability to calculate the search box to find a pack of synchronization signals with higher reliability compared with when the time of receipt is completely unknown, and the complexity of the mobile station is reduced in comparison with mobile stanzione and saved for further processing, what actually impossible if you want the search window is equal to 10 frames mdcr, which is necessary in order to guarantee the capture pulse packet synchronization when using traditional methods. In addition, the search box allows you to reduce the total measurement time.

Using knowledge ERE to calculate start time and a search window for pulse packet synchronization PS can significantly reduce the measurement time the measurement NRW downlink. Without receiving information eres usually requires that the mobile station is sought continuously until, until you find a pack of pulses the frequency so that the mobile station knew that the pack of synchronization signals will appear in the next frame. Information eres corresponding to all of the measured base transceiver stations, a mobile station can schedule different dimensions and limit the time control for periods of a search window, which is impossible when using scan techniques of the prior art.

Fig. 6 illustrates an example of the relevant part of the mobile station MS Fig.2 for the measurement of the observed time difference of the descending line is nchronization, which takes as input (for example, from the CLC Fig.2 through SMC, BPS and BPS) frequency, KIBS and ERE relative to the serving base transceiver station, each base transceiver station selected for measurement NRW. The determinant bundle of synchronization signals also receives information about the distances between its serving base transceiver station and the neighboring base transceiver stations, together with information of the cell radius cell for all neighboring base transceiver stations. This information may be updated periodically, CLC (when the MS performs roaming) and saved in memory, as shown at 63 in Fig.6, or information can be included in the request message location supplied to the determinant bundle of the pulse synchronization of the CLC.

Keys 61 pulse packet synchronization determines for each selected BPS approximately the expected time of arrival of the pulse packet synchronization about synchronization 60 of the frame structure of a serving cell (serving base transceiver station) and displays this information in a 64 in the monitor 65 time of receipt. Also in 64 determinant bundle of impulses St. synchronization each selected BPS. The determinant bundle of synchronization signals also calculates the search window for each selected base transceiver station, and outputs this information to the search window 62 to monitor the time of receipt.

Monitor the time of receipt performs measurement of the time of receipt relative to the signals received from BPS 68. Monitor the time of receipt may use the information computed time of receipt, the information window and the information bit stream 142 to perform the measurement of the time of receipt for each selected base transceiver station. With this information, the monitor time of receipt can effectively manage different dimensions and, when necessary, can capture and remember the signals received during the various search window, and then process these signals later. Processing the received signals to synchronize the receipt may be implemented by any desired conventional method or methods, described in detail in pending patent application U.S. serial 08/978960, registered on November 26, 1997

After the required measurement time of receipt of a completed, monitor the time of receipt may display 66 SMC). SMC then uses this information in the usual way to determine the location of the mobile station MS, the location of which is provided in the corresponding message to the requesting application 21 in Fig. 2. Alternatively, if MS knows the geographic location of the measured BPS, then MS can calculate its own location.

Despite the fact that the measurement with respect to the pulse packet synchronization GSM are described in detail above, it should be clear that the methods of the invention are equally applicable to various other types of burst.

In systems mdcr, such as those mentioned above, providing information eres mobile station has resulted in a significant improvement in comparison with the known methods NRW downlink. The mobile station can use the information eres to calculate the search window is usually in the manner described above relative to Fig.7. Since the mobile station now knows the difference synchronization between its serving base transceiver station and the respective neighboring base transceiver stations, the geometry of Fig.7 may be used, as mentioned above, to determine a search window for Sanchi maximum detection control panel and the associated correlations BCP should be performed only during a search window, in which it is expected that the signals for the control panel and BCP in the mobile station. In addition, since information eres determines not only when the mobile station must monitor the signals from the base transceiver station, but also defines the base transceiver station and a code group, the configuration of the CPSU associated with the base transceiver station can be a priori determined by the mobile station. Thus, for the given base transceiver station maximum detection control panel and the correlation PEP-BCP can be performed simultaneously, thereby advantageously decreasing the acquisition time compared to the above-described known methods, in which the correlation PEP-BCP should follow the detection of the maximum of the control panel. Reducing the time of collection allows a corresponding reduction in the duration of free periods in which the acquired information of the time of receipt. This decrease in free periods improves throughput downlink.

As an additional result of prior knowledge of the configuration of the CPSU mobile station is no need to perform the correlation peaks of the control panel with discoonect in the mobile station.

Because the maximum detection control panel and the correlation PEP-BCP are performed simultaneously, the results of these two operations can be combined for each time interval that provides improved signal strength and, therefore, efficient.

As the search window is set for each controlled base transceiver station, the probability of selecting a signal from a failed base transceiver station is greatly reduced. In addition, since the correlation is only close to the actual maximum, the probability of choosing the wrong peak is also reduced.

Another advantage of providing information to the eres in the mobile station is that the information eres, and the corresponding search window mobile station can correlate with signals other than the control panel and the CPSU. For example, a mobile station can correlate with the broadband channel base transceiver station (for example, the broadband channel is determined from the neighbor list of neighboring base transceiver stations) instead of or in addition to the PCP/BCP. Together with information eres, the network may determine the mobile station corresponding code group the crystals. From the information determining a code group information and determine the long code of the mobile station can, using traditional methods, to generate full length code (for example, 40960 elementary signals) broadband channel of this base transceiver station.

Broadband, for example, the shared physical control channel to the OFC of the above-mentioned communication systems SMDR usually has a power level of the same order as the sum of the signal power panel plus the signal strength of the CPSU. Also this broadband signal is transmitted continuously, and not ten percent of the time, as with the PCP/BCP. Thus, the broadband signal contains much more energy than the signals PCP/BCP. This higher energy level provides improved hearing and allows faster Assembly.

Because the broadband signal is transmitted continuously, this allows a significantly higher use of free periods than can be achieved using the control panel/BCP. For example, in any given time interval broadband channel provides ten times more characters for correlation than does the PCP/BCP. This allows you to use shorter and/or less than the hours of the Sabbath.

Because broadband is only one code, the amount of memory required for non-coherent combining, equal to half the value required in the correlation between the PEP and the CPSU (two codes). Also, since the base transceiver stations in the same vicinity will have a unique broadband channels, the probability of choosing the wrong base transceiver station is negligible. Unique channels provide the cross-correlation properties, which are significantly better (lower correlation) than with the control panel/BCP, thus the probability of choosing the wrong peak is much smaller than when using the control panel/BCP.

Fig. 8 schematically illustrates the relevant portion of an exemplary mobile station that can perform measurements NRW downlink systems mdcr, as mentioned above. Such systems mdcr may have usually the same architecture, as depicted in Fig.2, but with an air interface, implemented in accordance with the methods mdcr or SMDR. The mobile station of Fig. 8 includes an input 81 for receiving from the network (for example, the CLC Fig. 2) information eres, indicating the difference between real-time service are relatively mobile station shall perform measurement NRW downlink. Entrance 81 also receives from the network information identification code for each base transceiver station. In the embodiment, in which should be measured broadband, entry 81 takes in addition to information identifying the code group identification information of the long code for the broadband channel of each base transceiver station.

Keys 83 window receives information eres from the network, calculates the search window is usually in the manner described above relative to Fig.7, and displays the information window in the monitor 85 time of receipt (RR) mdcr. Monitor 85 performs the required operations (for example, detection of the maximum correlation) in order to measure the time of receipt for each of the desired base transceiver station.

In the embodiment using the control panel/BCP generator 87 code accepts input 81 information identification code for each base transceiver station, and generates from it a combination of the CPSU and 84 provides these combinations BCP monitor 85. In another embodiment, in which should be measured broadband, generator 87 code also accepts input 81 information identifikaciu response to information identifying the code group and identification information of the long code and 84 provides long codes in the monitor 85.

Monitor 85 controls the air interface mdcr 89, in accordance with the search Windows, and performs the requested measurement time of receipt. Monitor 85 may output to the network in 86 or the EAP information, or information NRW. Network (for example, the CLC Fig.2) may use this information in the traditional way to determine the location of the mobile station. Alternatively, if the mobile station knows the geographic location of the measured base transceiver stations, then the mobile station can calculate its own location.

Keys 83 window can receive input information on the distance between its serving base transceiver station and the neighboring base transceiver stations in order to help the determinant of the window in the definition of the search window. The distance information may be updated periodically, CLC (when the mobile station is roaming) and saved in memory, as shown at 82 in Fig.8, or information can be included in the request message to a location that is sent to the mobile station CLC. The determinant of the window uses the information eres to determine for each controlled base transceiver stationaryphase base transceiver station and combines this information with the expected time of receipt of the information of the distance to create the appropriate search box.

Specialists in the art it will be obvious that the parts of the exemplary mobile station of Fig. 6 and 8 can be easily implemented appropriately modifying hardware, software, or both in part of the data processing conventional mobile station.

In view of the above description it should be clear that the methods of the observed difference time downlink of the present invention to improve the sensitivity of measurements observed time difference downlink by providing the mobile station is better known bits of the pulse packet synchronization PS, increase the accuracy of the measurement of the time of receipt and the observed time difference, reduce the risk of measurement errors, reduce the time required to perform the necessary measurements, and require less memory and processing performance data in the mobile station.


Claims

1. Usage of mobile stations (MS) in a wireless communication network for measuring respective times of receipt of radio signals respectively transmitted by multiple transmitters (23, 28) in the network, namely, th is waiting for synchronization (80), used by the radio transmitter serving the mobile station communication, and relevant synchronizations used by other radio transmitters used in mobile communication station information the difference between the real time to calculate the measurement of the search window for each transmitter, determine (83) to a mobile communication station in response to the difference between the real time and with respect to synchronization used by the radio transmitter serving the mobile station communication, multiple points in time, which is expected receipt of the respective radio signals in a mobile communication station, each radio signal to mobile station communication control (85) receipt of the radio signal during the period of the search window and during the period of the search window mobile stations simultaneously perform a first search of the maximum detection code and an associated second search correlation of the coded signal, at least one transmitter serving the mobile station communication.

2. Usage of mobile stations (MS) in a wireless communication network for measuring respective times of receipt of radio signals, sootvetstuvuyshuyu, when will you be getting radio signals in a mobile communication station control (85) in the mobile station due receipt of radio signals during the period of the search window in response to information and during the period of the search window mobile stations carry out simultaneous correlation of the signal with the actual maximum, at least one transmitter serving the mobile station communication.

3. The method according to p. 2, characterized in that when the above operations provide provide information indicating the respective time periods during which it is expected that the respective radio signals in a mobile communication station, and when the above-mentioned monitoring control on the mobile station of arrival of each signal within an appropriate period of time.

4. The method according to p. 2, characterized in that when the above operations provide provide additional information to the difference between the real time indicating the difference between synchronization (80) used by the radio transmitter serving the mobile station communication, and relevant synchronizations used, as measured by radio transmitters, and in response to the differential the cheek, many moments (74, 75) time, which is expected receipt of the respective radio signals in a mobile communication station.

5. The method according to p. 4, characterized in that when the above operations provide additional use time to determine the appropriate periods of time during which it is expected that the respective radio signals in a mobile communication station, and when said operation control on the mobile station control the receipt of each signal within an appropriate period of time.

6. The method according to p. 5, characterized in that when the above operations on mobile stations use the time to determine the appropriate time periods.

7. The method according to p. 5, characterized in that when the above operations, the use count of the corresponding distances (82) driven by radio signals, in order to reach the mobile station communication.

8. The method according to p. 7, characterized in that when the above operations the calculation of the estimate for each signal the maximum distance of transmission, and the minimum possible length of the passage.

9. The method according to p. 8, characterized in that when mention is based on the time which is expected, and the minimum distance passing and set the end point (75) associated period of time based on the point in time at which it is expected, and the maximum possible distance of the passage.

10. The method according to p. 4, characterized in that during said operation of determining at the mobile station determines the points in time.

11. The method according to p. 4, characterized in that the radio signals pass through the channels multiple access with time division, and in the provision of information to the difference between the real time to achieve the expression of the difference between the real-time using at least one of the difference frame number, the difference between the number of the time slot (TS) and differential non quarters bits (QB).

12. The method according to p. 2, characterized in that the communication network is a cellular network.

13. The method according to p. 12, wherein the communication network is a GSM network.

14. The method according to p. 2, characterized in that the radio signals are signals of multiple access, code-division multiplexing (mdcr).

15. The method according to p. 14, wherein when said operation control for each signal are correlated signal with the first to the ASCII perform correlation signal code combination, which has a lot of second codes that sequentially transmit the associated radio transmitter so that each of the second codes in the code combination is passed simultaneously with one of the mentioned periodic transmission of the first code.

16. The method according to p. 15, characterized in that provide each transmitter information indicating a code group to which belongs the radio transmitter, and an additional mobile station determines mentioned code combination in response to the information code group.

17. The method according to p. 15, wherein detect the transmitted first and second codes by combining the results of these operations correlations.

18. The method according to p. 14, characterized in that provide information indicating extends codes, respectively, used by radio stations, and mobile stations is determined from the aforementioned information extends codes extend the codes used by the respective radio transmitters, and in these control operations use extends codes for control of wideband radio signals associated with the respective radio transmitters.

19. The method of detecting the location mob is zi respective times of receipt of radio signals, accordingly transmitted by multiple transmitters (23, 28) in the network, provide information indicating when the expected arrival of radio signals in the mobile stations, and mobile stations (85) supervise the receipt of radio signals during the period of the search window in response to the information, during the period of the search window mobile stations simultaneously perform the correlation of the signal together with the actual maximum, at least one transmitter serving the mobile station communication, and using the measured time of receipt for detecting the location of a mobile station communication.

20. The method according to p. 19, characterized in that the radio signals are signals of multiple access, code-division multiplexing (mdcr).

21. The method for determining the time of receipt of the radio signal in a mobile communication station (MS) operating in a wireless communication network, namely, that receives from the wireless communication network information (63), from which may be determined by the information content of the signal, but the information itself does not disclose the information content of the signal, determine (61) the informational content of the radio signal in response to Nala.

22. The method according to p. 21, characterized in that the above information contains information indicating the synchronization of the transmission signal.

23. The method according to p. 22, characterized in that the said information synchronization information transmission is the difference between the real time (eres) indicating the difference between synchronization (60) famous station of radio communication and synchronization used by the transmitter (23), which must be transmitted radio signal.

24. The method according to p. 21, characterized in that the above information contains information indicating a radio transmitter, from which transmitted the signal.

25. The method according to p. 24, wherein the communication network is a GSM network, and information indicating a radio transmitter, includes the identification code of the base station (KIBS), which identifies the base station in the GSM network.

26. Device for use in detecting the location of a mobile communication station (MS) in a wireless communication network containing the determinant of (61) for determining, when it is expected that each of the multiple radio signals in a mobile communication station, and monitor (65) signal for measuring respective times of receipt of radio signals, and monitor th information indicates when the expected arrival of radio signals in a mobile communication station, and mentioned the monitor responds to said information for controlling receipt of signals during the period of the search window.

27. The device under item 26, characterized in that the mentioned keys provided in the mobile communication station.

28. The device under item 26, characterized in that the said determiner determines the appropriate time periods during which it is expected that the respective radio signals in a mobile communication station.

29. The device under item 26, characterized in that the identifier contains an input to receive the difference between the real time (eres), indicating the difference between synchronization (60) used by the transmitter (23) serving the mobile station communication, and relevant synchronizations used by radio transmitters, which transmit radio signals, and this determinant responds to information the difference between the real time to determine the relative synchronization used by the serving transmitter, multiple points (74, 75) time which is expected receipt of the appropriate signals in mobile is awn work when using the points in time to determine the appropriate periods of time, during which it is expected the arrival of radio signals in a mobile communication station.

31. The device according to p. 30, characterized in that the mentioned keys are designed to work within the specification of the above time periods for calculating the respective distances (63), passable by radio signals, in order to reach the mobile station communication, and this determinant is made with the possibility of working for estimating the maximum possible distance passing and minimum distances of passage for each of the radio signal to establish the initial point (74) associated period of time based on the point in time at which it is expected, and the minimum distance of the passage and to set the end point (75) the associated period of time based on the point in time at which it is expected, and the maximum possible distance of the passage.

32. The device according to p. 26, wherein the communications network is a cellular network.

33. The device under item 32, wherein the communication network is a GSM network.

34. The device under item 26, characterized in that the radio signals are signals of multiple access, code-division kaylamichaely to provide it codes for use in the control signals.

36. The device according to p. 35, characterized in that the mentioned codes contain extends codes respectively associated with the radio signals.

37. The device according to p. 35, characterized in that the said codes include codes carried by the radio signal.

38. The device according to p. 37, characterized in that the mentioned codes contain code combinations, respectively associated with radio transmitters that are used to generate appropriate signals.

39. The device according to p. 35, wherein the code generator includes an input to receive an identification code in response to that feature these codes.

40. The device according to p. 35, wherein the code generator is provided in a mobile communication station.

41. Device for measuring the time of receipt of the radio signal in it, containing the input (81) for receiving information from which may be determined by the information content of the signal, but the information itself does not disclose the information content of the signal, the determinant of (83) connected to the said input and responsive to information the difference between the real time (eres) to determine the information content of the signal and to calculate the measurement of the search window, and Elam for the use of the information content of the signal at the measurement time of receipt of the radio signal and control the receipt of the radio signal during the period of the search window.

42. The device according to p. 41, characterized in that the above information contains information indicating the synchronization of the transmission signal.

43. The device according to p. 42, wherein the synchronization information transmission information is the difference between the real time (eres) indicating the difference between synchronization (80), well-known device, and synchronization used by the transmitter (23), which must be transmitted radio signal.

44. The device according to p. 41, characterized in that the above information contains information indicating a radio transmitter, from which transmitted the signal.

45. The device according to p. 44, wherein the communication network is a GSM network, and the information indicating the radio transmitter, which contains the identification code of the base station (KIBS), which identifies the base station in the GSM network.

46. The device according to p. 41, wherein the device is a mobile station communication (MS).

 

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10 dwg

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Radio system // 2542579

FIELD: radio engineering, communication.

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EFFECT: higher efficiency and simplification of corresponding radio systems.

1 dwg

FIELD: radio engineering, communication.

SUBSTANCE: invention can be used to determine spatial coordinates of a stationary or mobile radio signal receiving radio facility (RO). Radio signals with given separate features and with given time delays between radio signals, which provide ordered arrival of radio signals at a RO, which is located at any point of the service area and known at the RO, are transmitted in series from N≥5 seriously numbered radio signal transmitting stations of a ground radio signal transmitting system, coordinates of phase centres of antennae of which are known at the RO, and the reception time of said signals is recorded in a time reference system specified at the RO. At the RO, coordinates of the phase centre of the antenna of the RO are measured according to proposed measurement equations based on said coordinates and reception time of identified corresponding stations of the ground radio signal transmitting system in a series, based on said given time delays between radio signals.

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Radio system // 2543470

FIELD: radio engineering, communication.

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1 dwg

FIELD: radar and navigation.

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1 cl, 2 dwg

FIELD: radio engineering, communication.

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EFFECT: increasing the accuracy and reliability of determining the spatial coordinates of objects.

1 cl

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