Method and device for use in a communication network

 

The invention relates to a method and to a mobile station, intended for use in networks like global system for mobile communications (GSM) network or derived from GSM, designed to provide opportunity for the mobile station to transmit the message data measurements for cells located in the vicinity of the active cell. Identification of unidentified carrier broadcasting control channel (RKU) is initiated in the mobile station, when on the basis of the measured signal levels predicted that the said carrier CR is soon to become one of the most powerful bearing RKU, considering the average values of the signal levels for the period of measurement. The delay from the time when the carrier CR becomes one of the most powerful, to the point in time when the carrier CR is identified, can be reduced, and in some cases eliminated. Thus, the mobile station can transmit the message data measurements for the carrier CR in the network at an earlier stage, which allows the switching of the communication channels in the corresponding cell area with higher performance. 2 C. and 7 C.p. f-crystals, 18 ill.

Technical field the Invention relates to a method and m, rozvodnou from GSM. The invention allows for faster switching of communication channels from one cell of the cellular system to another.

Prior art In the global system for mobile communications (GSM) is important to the mobile station, which was installed call transmitted via the bidirectional channel (radio) communication in the active cell area was not disconnected when moving mobile station in another cell of the cellular system. To support the call to another cell in the cellular system should be replaced with channels of communication on the communication channel in another cell area. The replace function of the communication channels during an ongoing call is called by the switching of the communication channels from one cell of the cellular system to another.

The decision to initiate the switching of the communication channels is made in the global system for mobile communications (GSM) based on, among other things, the measurement data transmitted from the mobile station. The mobile station measures the signal levels of the so-called bearing broadcasting control channel (CGS) transmitted from the base stations serving the cells in the vicinity of the active cell. The average values of the signal levels generated for each of the one the values of the signal levels of the six most powerful carrier CR is transmitted to the global system for mobile communications (GSM). Before a mobile station can transmit a message signal for a carrier broadcast control channel (CGS), a mobile station must identify the carrier CR. Identification bearing the broadcasting control channel (CGS) begins after it is discovered that this carrier is one of the six most powerful bearing RKU compared with the average values defined within one measuring period. Identification bearing the broadcasting control channel (CGS) takes approximately one or a few seconds; this time interval, calling the appropriate delay from the time when the level of the carrier signal CR proved to be suitable for transmission of the message until the time when the mobile station can transmit a message about the level of the carrier signal CR.

In the United Kingdom patent GB 2225196 described cellular radio system, in which the serving base station may reserve channels in the surrounding cells. When switching channels at the base station in one of the surrounding cells can be used a reserved channel, which reduces the time elapsed since the adoption of the decision on pereklyuchatele radio in which the mobile station measures the levels of the signals received from the base station in the active cell and from base stations in the surrounding cells. A mobile station is provided with means which, for each of the received signals, determines the average value of signal levels in the short and long periods of time. In the mobile station, the two middle values of the signal levels for the serving base station are compared with the corresponding level signals to base stations in the surrounding cells. The mobile station initiates the switching of the communication channels in the neighboring cell, when the level of the signal received from the base station in the cell is higher than the level of the signal received from the serving base station at a certain value, called the stock as hysteresis. When comparing the average values of the signal levels for a short period of time applies a relatively higher margin hysteresis compared to stock as hysteresis, which is used when comparing the average values of the signal levels for a long period of time.

Summary of the invention the Present invention is directed to solving the problems of reducing the delay time, when the and management (CGS) is suitable for the transmission of messages in the network, until the time when the mobile station has already identified the carrier CR, and able to convey the message about the average value of signal levels.

The present invention, therefore, is to provide the mobile station with a higher speed to convey the message about the measurement data for the cell located in the vicinity of the active cell.

The problem is solved, in principle, the way in which the mobile station initiates the identification of the received carrier broadcasting control channel (CGS) when the mobile station is predicted that this carrier RKU, probably, will soon be among the most powerful bearing RKU. The invention relates to the aforementioned method, and mobile station having the means necessary to implement this method.

More specifically, the problem is solved as follows. Allocated communication channel for communication between the mobile station and the first base station. The mobile station measures the signal levels for carrying broadcast control channels (CGS) received from base stations located in the vicinity of the first base station, and determines the average values for these signal levels for each of the most powerful of carrying broadcast control channels (RKU), identification of which have already been carried out. The mobile station initiates the identification of the received carrier broadcasting control channel (CGS) when projected, according to the pre-defined rule that the carrier will soon be one of the most powerful bearing RKU, taking into account the average values of the signal levels during one of the periods of measurement.

One of the advantages of the present invention is that the delay from the time when carrying a broadcasting control channel (CMR) has become one of the most powerful bearing RKU, taking into account the average values of the signal levels to the time when the carrier is identified by the ECA can be in many cases reduced, and in some cases eliminated. Therefore, a mobile station is able to more quickly send a message about the measurement data carrier for broadcasting control channel (RKU), enabling faster switching of the communication channels in the corresponding cell. Due to the fact that switching of the communication channels from one cell to another can be performed more quickly, increase the chances of maintaining the established call in situations where conditions radio quickly ISM implementation with reference to the drawings, which shows the following: Fig.1A and 1B is a view of parts of the network global system for mobile communications (GSM); Fig.2 is a block diagram of multicade, consisting of 51 of the frame, Fig.3A is a block diagram of a process corresponding to a known method; Fig.3B is a block diagram of the process, which together with Fig.3A illustrates a first variant of the method according to the present invention; Fig.3B is a block diagram of the process, which together with Fig.3A illustrates a second variant of the method according to the present invention;
Fig. 3G is a block diagram of a process illustrating a third variant of the method according to the present invention;
Fig. 4 is a timing diagram illustrating the division of time into periods of measurement and payperiod;
Fig. 5A - 5G - histogram showing the average value of signal levels for a set of bearing the broadcasting control channel (CGS) for each podpriatov in Fig.4;
Fig. 6 is a histogram illustrating the growth of the average value of the levels of the carrier signals for broadcasting control channel (RKU);
Fig. 7A - 7B is a histogram showing the average value of signal levels for a set of bearing the broadcasting control channel (CGS) for each of the periods of measurement, shown n the block diagram of the process, describing the operation of the functional matching block in Fig.10;
Fig. 10 is a functional diagram of a mobile station according to the present invention.

Detailed description of embodiments of the invention
Fig. 1A depicts a portion of a network ST1 global system for mobile communications (GSM) and a subset of the different types of modules, in such a network ST1. The geographic area covered by the network is divided into cells (cell area) A31-s. Each cell area provides radiochat in a certain field and assigns the set of frequencies for communication in this area. Each cell area C3 1-C3 5 is served by a base transceiver station BPS-BPS having means for radio communication with mobile station MS, in which the current time is located in the cell area. Cell area C3 1, in which the mobile station is M, is called a serving cell area, and the corresponding base station BPS is called a serving base station. Mobile station MS includes a tool for communication with base stations BPS - BPS network ST1 and used by the subscriber to access the communication services offered by the network ST1 global system for mobile communications (GSM). A group of basiliani controlled switching centre mobile service CCM. Switching center CCM provides connectivity calls from mobile stations MS to mobile stations MS in the area served by the switching center CCM.

When you make a call to the mobile station or the mobile station MS, radio communication between the mobile station MS and serving base station BPS allocated communication channel KS1. If at any time request the mobile station MS moves to the second cell area C3 4, in this second cell area C3 4 must be allocated a new communication channel SC4, so that the request has not been broken. The replace function of the communication channels during the established call is defined as the switching of the communication channels from one cell area to another. The decision to initiate the switching of the communication channels from one cell area to another is made by the controller KBS base station, which manages the serving base station BPS.

Before the controller KBS base station decides to switch communication channels from one cell area to another, the mobile station MS must first send a message about what cellular zones are appropriate candidates for switching communication channels from one cell area to another. Mob Is U, transmitted by base stations BPS-BPS that are in the surrounding cell zones C3 2-C3 5. For each of the load-carrying radio control channels RCU-RCU average value of signal levels is determined by the measuring period, and average values for the most powerful supporting CGS are communicated to the controller KBS base station. Before a mobile station MS transmits a message about the signal level of a certain carrier radio control channel RCU, mobile station MS, according to the technical conditions of the global system for mobile communications (GSM), must identify the carrier broadcasting control channel RCU. This is done by reading the mobile station information identifying OCBS 4 (identification code of the base station), which is transmitted to the carrier broadcast control channel RCU.

Fig. 2 shows how a zero time interval (slot) carrier radio control channel RCU is used to transfer information to different logical channels. In Fig.2 shows how frames multiple access with time division multiplexing (MDRC) 51-multicare 200 used for transferring logical channels. Logical channels contain the th correction carries information for frequency correction of the mobile station MS. The channel 202 synchronization transfers information to the mobile station MS and the above-mentioned identification information OCBS in the form of an identification code of the base station (OCBS). In addition to the channel 201 controls the frequency correction channel 202 synchronization 51-multi-shot 200 also contains logical channels: a common control channel (CMOS) and broadcast control channel (CGS). For more details about the channel structure of the global system for mobile communications (GSM) described in the technical specifications global system for mobile communications GSM and GSM 05.01 05.02.

In order for a mobile station MS was able to determine the identity of the carrier, i.e. the identification code of the base station (OCBS), it should detect and decode the first channel 201 control frequency correction, and then the channel 202 synchronization. Identification bearing the broadcasting control channel RCU may take a couple of seconds.

The messages used to represent suitable candidates for switching communication channels from one cell area to another, there is a place for reporting data measurement up to six bearing the broadcasting control channel (CGS).

Conventional mobile station transmits soosten identification code of the base station (OCBS).

For multiband mobile station, to determine the bearing to the broadcasting control channel (CGS), which must be transmitted messages on the measurement data, the parameter called "multi-band messaging". The selection criterion can be modified so that, in the selection, in addition to the average values of the signal levels were also taken into account the frequency band belongs to each carrier by the broadcasting control channel (CGS).

For more information about sending messages, measurement data from the mobile station contained in the technical conditions of the global system for mobile communications GSM 05.08.

To simplify the description of the invention is described below on the assumption that it applies to mobile stations of the usual type, in which the measurement data for the six most powerful supporting the broadcasting control channel (CGS) with a known identification code of the base station (OCBS) transmitted by the mobile station. For professionals it should be obvious how to adapt the invention for use multiband mobile station using a different selection criterion.

In known mobile stations identification neopoznan among the most powerful bearing RKU comparison of average values of the signal levels during the measurement period. Due to the fact that the mobile station must identify the carrier broadcasting control channel (CGS) before it will be possible to transmit the message data measurements for the carrier CR in the base station controller, it causes a delay from the time when the carrier CR is among the most powerful bearing RKU, so it is advisable to send a message about the measurement data to the carrier CR, up to the point in time when the mobile station is able to transmit the message data measurements for the carrier CR in the base station controller.

In some situations, for example when the user of the mobile station directs the angular sector of reception in the region of the celestial sphere or in an underground train station, the radio conditions change very quickly. In these situations, the radio connection with the serving base station deteriorates very quickly, whereas the signal level of the new base station is able to grow very quickly. In order to maintain established call in such situations, it is very important to be able to quickly switch channels due to the new base station. Since the above-mentioned delay contributes to delaying the switching of the communication channels from the one who m not to wait until the carrier broadcasting control channel (CGS) will be among the most powerful supporting CGS relative to the average values of the signal levels at the measuring period, before initiating the identification of the carrier CR. Instead, identification bearing the broadcasting control channel (RKU) is triggered when the measured signal levels, it is predicted that soon she will be one of the most powerful supporting CGS relative to the average values of the signal levels at the measuring period. Thus, identification of the carrier CR is carried out at a time when the average value of signal levels is growing, allowing you to reduce the delay or, in some cases, eliminate it.

In Fig. 3A and 3B depict a flowchart of the procedure of the first variant of the method according to the present invention.

In Fig. 3A shows that at the stage 301 is allocated a communication channel for communication between the first base station and mobile station. In terms of global system for mobile communications (GSM) communication channel is the physical channel containing two logical channel: channel traffic (CT) and slowly connected the control channel (MPKA). The trafc channel is used for the case is I, among other things, for the above message reporting the mean values of the levels of signals carrying RKU. For more information, see the technical conditions of the global system for mobile communications GSM and GSM 05.01 05.02.

In connection with the allocation of the communication channel, at step 302, the time is divided into successive periods of measurement, the length of which corresponds to multicare slowly connected the control channel. In this case, the frame slowly connected the control channel (MPKA) consists of 104 frames multiple access with time division multiplexing (MDRC) corresponding to the duration of 480 MS.

After step 302 block diagram of the process branches into two parallel branches. This should be interpreted in such a way that the steps of the method each of the branches should be carried out simultaneously with the steps of the method of the other branches.

At step 303, the mobile station measures the signal levels of each of the bearing RKU contained in the list of distribution of radio control channels received from the first base station. The network operator determines which bearing CGS should be in the list of distribution of radio channels management RCU. Sometimes the distribution list radioveshatelinye station to perform the measurement, and also convey a message about the measurement data for this carrier RKU. Bearing CGS are measured sequentially, one after the other, and when the sequence ends, another one starts. Measurements are made between the temporary slot transmission and following time slot reception belonging to the selected communication channel.

Step 304 instructs waiting until completion of the measurement period.

At step 305 the measured values obtained in step 303 during the measurement period used to determine average value of signal levels for each of the bearing RKU full measuring period.

At step 306 checks whether any of the six most powerful supporting broadcast control channels (CGS) unidentified. If so (the YES), then step 307 is initiated by the identification of unidentified carrier RKU.

After step 307, or if at step 306 it was not detected unidentified carrier broadcasting control channel (CGS) from among the six most powerful bearing RKU, then at step 308 selects bearing RKU, which must be transmitted reports the mean values of the signal levels.

At step 309 is initiated by the transmission average value of signal levels for the law of the first base station. This information is passed on slowly connected to the control channel during the next measurement period. If the control channel is needed during the next measurement period for transmission of other information, these measurement data are not transmitted. These dimensions, however, are always transmitted at least every second measuring period.

After step 309, the procedure returns to step 304, waiting, when will the next measuring period.

Steps 301-309 method shown in Fig.3A correspond to what is known in the mobile station. Fig.3B illustrates the stages 310-315 ways that are new according to the present invention.

At step 310 dividing each measurement period the number of podpriatov.

Step 311 instructs waiting until the end of the sub-periods.

At step 312 the measured values obtained in step 303 during the sub-periods are used to determine the average value of signal levels on each of the unidentified bearing CGS for the completed sub-periods.

At step 313, the average value of signal levels on each of the unidentified bearing CGS for sub-periods are compared to the mean value of signal levels for directly before the great, than the first preset threshold value (the result is YES), it is predicted that this carrier broadcasting control channel (RKU), probably will soon become one of the six most powerful bearing RKU, given the average value of the levels of signals for the measuring period.

If at step 313 was not detected unidentified carrier CGS, which is characterized by an increase in the average value of signal levels greater than the first threshold value (the result is NO), then at step 314 for each of the unidentified bearing RKU average value of signal levels for the sub-periods are compared to the mean value of signal levels for the two sub-periods poduridae before.

The first threshold value is selected so that when the comparison at step 313 bearing RKU stood out in case she has grown very strongly on the signal level during the last low. The second threshold value is set so that when the comparison at step 314 carrier RKU stood out in case she grew up on the level of the signal is very strongly over the last two sub-periods, but not fast enough to be selected during any of the last two podpriatov at step 313.

When the choice of thresholds is important uu.

If at step 313 and 314 carries a broadcasting control channel (CGS) was highlighted as one that is likely soon to become one of the six most powerful bearing RKU measured at the measuring period, it is likely that measurement data carrier CR that was allocated will be sent. Therefore, at step 315 is triggered by the identification of unidentified carrier RKU.

If at steps 313 and 314, respectively, was detected more than one carrier RKU, which grew at an average value of signal levels faster than the first or second threshold value, respectively, at step 315 is triggered by the identification of unidentified bearing RKU, characterized by the rapid growth of the signal level.

After step 315, or, if the comparison at step 314 was not allocated any unidentified carrier RKU (the result is NO), the procedure returns to step 311 and waits for the next sub-periods. Steps 303, 304-309 and 310-314 way repeated until then, until the selected channel.

In the above method corresponding to the invention, the identification of unidentified carrier broadcasting control channel (RKU) is triggered not only when it is predicted that this carrier RKU, who seemed one of the most powerful bearing RKU on measuring period, initiated by another method known in the prior art (step 307).

It is assumed that the method of the invention, described with reference to Fig.3A and 3B, is carried out in the network ST1 shown in Fig.1A, 1B. The stages of the method shown in Fig.3A and 3B, with the exception of step 301, a fully implemented in the mobile station PO1. Step 301 is performed in interaction with other modules in the network ST1.

Fig. 1B shows that the network ST1 contains three cell zone C3 6 - C3 8 in addition to cell zones C3 1 - C3 5 shown in Fig.1A. Cell zone C3 6 - C3 8 are served by base transceiver stations (BPS - BPS), each of which transmits carrying broadcast control channels (RCU-RCU). Fig.1B also shows in more detail the mutual location of the cell areas. Cell area C3 4, bounded by the dotted line that provides radiochat in the underground train station. The call is established when the mobile station MS is located in the cell area C3 1 and mobile station MS then moves to the cell area C3 4.

Fig. 4 illustrates how a mobile station MS, after allocation of the communication channel KS1, time is divided into periods of measurement and payperiod. Fig.4 shows two consecutive measurement period PI-P of which corresponds to half of the measuring period. On the time axis T shown a number of points - the points in time T1-T5, which mark the beginning and end of each podpriatov FG1-PP. Moments in time that have an odd number position, T1, T3, T5 also mark the beginning and end of the measurement periods PI-PI. Moments in time that have an even number of positions, T2, T4 mark the center point of the measurement periods PI-PI.

As noted above, the mobile station MS measures the signal levels of each of the bearing CGS in the list (RCU) distribution of radio control channels received from the serving base station BPS. This example assumes that the list (RCU) distribution of radio control channels includes carrying radio control channels RCU-RCU shown in Fig.1B.

The obtained measurement values are used to determine the average values of the signal levels in each of podpriatov FG1-PP and each and periods of measurement PI-PI.

Fig. 5A-5G depict variations of the average values of signal levels on poderiam FG1-PP. Fig. 5A depicts a histogram of averages 501 of the signal levels of certain mobile station MS the sub-periods FG1 for each of the bearing broadcasting channels opt the most powerful supporting radio control channels RCU-RCUS, RCU-RCU were also six most powerful carrier CR of the previous measuring period and that the mobile station MS during the current measuring period PI transmits messages about the measurement data for these bearing CGS in the controller KBS base station through the serving base station BPS. Fig. 5B-5D show the corresponding information for each of podpriatov PP-PP (the order of columns is the same as in Fig.5A). In Fig.5A-5G shows how the average value of signal levels is growing for the weak carrier radio control channel RCU in Fig.5A, while decreasing for the other bearing RKU. The increase in the level of the signal is particularly strong in sub-periods P, which corresponds to the change between figs.5A and 5B.

At time T3 in Fig.4, i.e. at the end of sub-periods P, for unknown carrier radio control channel RCU is the comparison between the average value of signal levels in the sub-periods P and an average value of signal levels in the immediately preceding period FG1 (step 313 in Fig.3B). The difference in the mean values of the signal levels shown in Fig.6 the first column 601. The result of the respective comparison of the average values of signal levels on poderiam P and the x values of the signal levels in payperiod PP and PP5 shown by the third column 603. The first threshold value 604 is shown with a dotted line. It is evident from Fig.6, therefore, it can be seen that the average values of the signal levels between intervals FG1 and PP, presents the first column 601 exceeds the first threshold value 604. Mobile station MS, therefore, will be to initiate the identification of unidentified carrier radio control channel RCU at time T3 in Fig.4.

Fig. 7A and 7B show the average values of the signal levels after periods of measurement PI and PI respectively. It is evident from Fig.7A can be seen that an unidentified carrier radio control channel RCU is not among the six most powerful bearing RKU comparison of average values 701 levels of the signals at the measuring period PI. Fig.7B shows that the above-mentioned carrier radio control channel RCU is among the six most powerful bearing RKU comparison of average values of the signal levels at the measuring period PI. Thus, the known mobile station could initiate identification bearing the broadcasting control channel RKO after the end of the measuring period PI, i.e. at time T5. This situation should be compared with the mobile station MS, the second radio channel control RCU at time TK.

It should be noted that Fig.5A-5D and 7A-7B are intended only to illustrate the principle of the invention and should not be taken as showing the actual values of the signal levels and the first threshold value.

Mobile station MS corresponding to the invention contains:
- the means of communication to communicate with the serving base station BPS on a selected communication channel KS1; examples of communication tools are blocks 804-813, 817-820, 823-824, described below;
- a measuring instrument for measuring levels of radio signals carrying control channels RCU-RCU transmitted from base stations located in the vicinity of a serving base station;
- example of measurement tools is a block 1002, described below;
first means for averaging to determine average values 701 levels of radio signals carrying control channels RCU-RCU in each of these measurement periods PI-PI;
the second means of averaging to determine average values 501 of the levels of signals for the signal levels measured for supporting radio control channels RCU-RCU in the above-mentioned payperiod FG1-PP periods of measurement PI-PI;
- example tools averaging is b is drivemon example RCU), which, perhaps, will soon be one of the most powerful bearing RKU, considering the average values of signal levels in one of the periods of measurement; an example of the allocator is unit 1001, described below;
- a means of identification (identification) for recognition (identification) unidentified carrier RKU, for example an unidentified carrier radio control channel RCU that was allocated; an example of a means of identification is a block 1003, described below;
the means of transmission of messages on the measurement data to transmit messages, after one of the periods of the measurements about the mean values of the signal levels for the measuring period for the six most powerful bearing RKU, serving base station BPS; an example of such means is a block 1004, as described below.

A more detailed description of the mobile station MS will be given below with reference to Fig.8-10.

Fig. 8 depicts a block diagram of the hardware of the mobile station MS. Mobile station MS contains a microphone 801, convert recorded sound into an analog electrical signal. Analog-to-digital Converter (ADC) 802 converts the analog signal from the microphone 801 digital information. The speech encoder 803 simetry enters information about the detection and correction of error signals, you make while communicating over the communication channel KS1, in the data flow. Interleaver 805 receives the encoded words from the channel encoder 804 and distributes information of each encoded words in a series of information packages. Generator 806 packages selects pulses from the interleaver 805 output, which should be sent in packets, and uses this information to generate an appropriate analog signal in the frequency band of the modulating signals.

The transmitter 807 converts the signal received from the generator 806 packets of pulses in the signal through the modulation of the carrier frequency which is determined by the frequency synthesizer 808. The transmitter 807 amplifies the modulated signal to a suitable power level.

Mobile station MS also contains the radio 809, the receiving radio signals, the frequency of which is determined by the frequency synthesizer 808. Radio 809 converts the received radio signal into an analog bandpass signal. The output signal from the radio 809 discretized second ADC Converter 810. The output from the second ADC Converter 810 is processed by photocomposition 811 to compensate for a temporary variance, which was the C number of packets and generates encoded words from this information. Channel decoder 813 performs error detection and error correction on the output of the converts of the interleaver 812. Speech decoder 814 extends the output of the channel decoder 813. Digital to analogue Converter DAC 815 converts the output of the speech decoder into an analog signal for use with a head phone 816 to generate a sound signal.

Depending on what takes place at some point in time, the transmit / receive switch 823 connects to the antenna 824 or radio transmitter 807 or radio 809.

The mobile station further comprises a processor or Central processing unit (CPU) 817 executing software instructions stored in permanent memory (ROM) 818. The processor 817 provides the operation of the mobile station MS and controls other modules in accordance with software commands. The result in the form of digital data created by the module, is passed through the memory device with random access (NVR) 819. For example, the output of the speech encoder 803 stored in the NVR 819, and channel encoder 804 selects the data from the NVR 819.

The oscillator 820 is used in the mobile station as the generator is upominki devices 818, 819, and a control bus through which the CPU 817 can manage the modules. These two buses are not shown in Fig. 8. As mentioned above, the data exchange between modules is performed by storing data in NVR 829 and fetch the data from this NVR. Logical data flow between the various modules illustrated in Fig.8 by the dotted line.

Control information, such as reports on measurement data from the mobile station or the list (RCU) distribution of radio control channels transmitted between the mobile station MS and serving base station BPS messages about the transmission of signals. This information is issued from the processor 817 in the channel encoder 804 and accordingly accepted by the processor 817 of the channel decoder 813. In addition, the above description corresponds to what happens in the transmission and reception of information in this case.

When the mobile station MS should measure the level of the carrier signal CR, the frequency synthesizer 808 tuned to the carrier frequency broadcasting the control channel RCU. Then the radio 809 carrier accepts the broadcasting control channel RCU. The received energy is stored in the meter 822-level signals, and the last Read value is stored in NVR 819.

In the process of identification bearing the broadcasting control channel RCW first control channel frequency correction is transmitted carrier radio control channel RCU, and then detected and decoded by the channel synchronization. The detection and decoding of the mentioned logical channels is performed during idle frames multiple access with time division multiplexing (MDRC), not used for communication with the serving base station BPS on a selected communication channel KS1. Upon detection of the control channel frequency correction frequency synthesizer 807 tuned to the carrier frequency broadcasting the control channel RCU. Then the radio 809 runs and receives data over the entire frame multiple access with time division multiplexing (MDRC). The received data is converted into digital form by the second ADC Converter 810 and then processed by the detector 821 control channel frequency correction (CHUCK). The result of the detector 821 control channel frequency correction (CHUCK) is stored in NVR 819. After data collection, during the idle period of the frame multiple access with time division multiplexing (MDRC) in eleven Carracci. If Yes, then the mobile station MS will be required frequency correction before performing the detection and decoding of the sync channel. And again, the frequency synthesizer 808 tuned to the carrier frequency broadcasting the control channel RCU before the radio 809 runs and receives data over the full frame multiple access with time division multiplexing (MDRC). The received data is converted into digital form by the second ADC Converter 810. Channel decoder 813 selects the output from photocomposer 811 for packet synchronization. The output of the channel decoder 813 show whether the detected synchronization packet, and, if Yes, then also contain the above data identification code of the base station (OCBS). For discovery channel synchronization may be necessary to use single frame multiple access with time division multiplexing (MDRC) in eleven 26-multiquadric.

If were not detected in any package frequency correction or synchronization packet, then the received signal is not the carrier CR. In this case, the collected measurement data related to the adopted signal are removed.

In Fig.10 depicts a functional diagram of a mobile station MS. It should be noted that in Fig.10 illustrates only those functional blocks that relate to the present invention. Mobile station MS contains four functional blocks: a matching unit 1001, the device 1002 collect the measurement data, the decoder 1003 control channel frequency correction (CHUCK)/channel synchronization (COAG) and the device 1004 e-mail slowly connected the control channel (MPKA). Functional matching block is implemented only on the basis of the software, while other functional blocks contain both hardware and software.

The device 1002 data collection measurement perform measurements of signal levels on the bearing RKU. The data collection device measuring receives the signal from the matching unit that specifies a procedure for measuring the levels of the signals at the supporting radio control channel RCU-RCU. The signal also contains information about how often the collected measurement data must be passed to the matching unit, which in this case should be done after each sub-periods corresponding to the half of multicade slowly which measures the levels of the radio signals carrying control channels RCU-RCU. For each of the load-carrying radio control channels RCU-RCU subject to measurement device 1002 collection of measurement data, there are two variables: the values of the adder power signals and counter. Each time the device 1002 data collection measurement measures the level of the carrier signal CR, the measured value is added to the adder capacity signals corresponding to the carrier CR, and the value of the counter increases by one. When low passes, the device 1002 data collection measurement transmits a message about the contents of the adders power signals and counters for each of the load-carrying radio control channels RCU-RCU in the matching unit 1001. Then the data collection device measurement resets all the power adders signals and counters to zero and starts the cycle of collecting new dimension values.

The decoder 1003 control channel frequency correction (CHUCK)/channel synchronization (COAG) identifies bearing RKU. When the matching unit 1001 decides that carrying CGS must be identified, the decoder 1003 COCK/COAG sends a signal containing information indicating that the carrier CGS must be identified, and information about what priority should be given to the Xia low priority the identification may be interrupted if a matching block is received, the request identifying the second carrier RKU before completed the first identification. If identification bearing the broadcasting control channel RCU is given high priority, identification is always completed before the next identification. The decoder 1003 COCK/COAG reads the identification code of the base station OCBS, portable carrier radio control channel RCU, in a way known in the art. Then the decoder COCK/COAG is sent to the matching unit 1001 signal containing identification data OCBS (identification code of the base station) carrier radio control channel RCU.

The device 1004 e-mail slowly connected the control channel (MPKA) handles the reception and transmission on the corresponding control channel messages about the transmission signals transmitted over the communication channel KS1.

After taking in the corresponding control channel messages about the transmission of signals from the serving base station BPS device 1004 e-mail slowly connected the control channel (MPKA) transmits a signal containing the contents of the received communicated to the reamers messages about the transmission of signals, received from the serving base station BPS, are so-called message "system information 5", containing the distribution list broadcast control channels (RCU).

The above message about the transmission of signals containing reports on measurement data from the mobile station MS, passed by slowly connected to the control channel. After each measuring period matching unit 1001 sends a signal to the device e-mail slowly connected the control channel (MPKA) containing the data to those of the carrier CR, the average values of the signal levels at the measuring period which must be passed. The device 1004 e-mail slowly connected the control channel (MPKA) checks whether slowly connected the control channel used for transmission of the so-called report message, the measurement during the next multicade slowly connected the control channel (MPKA). If the control channel is free, the device e-mail slowly connected the control channel (MPKA) compiles and passes the mentioned message the next time multicade. If not, then the information from the matching unit 1001 has the duty to regulate, that at least every second multi-shot the MPKA is used to send messages to report the measure.

The matching unit 1001 provides the operation of the mobile station MS. It sends commands and information to other functional blocks 1002-1004 or receiving information from other functional blocks 1002-1004. After the selection of the communication channel KS1 matching unit 1001 transmits the signal to the device 1002 data collection measurement by specifying the sequence of measurement of the levels of the signals carrying the broadcasting control channel RCU-RCU list (RCU) of the broadcasting distribution channels management and reporting the measured signal levels after each sub-periods corresponding to the half of multicade slowly connected the control channel (MPKA). If later from the device 1004 e-mail slowly connected the control channel (MPKA) is the modified list (RCU) allocation of radio channels, the device 1002 collection of measurement data is sent to a new signal containing the new information as, for example, which bearing CMR to measure.

When the matching unit 1001 accepts the report of the measurement data from Chala determines was or not completed the period of measurement, which correspond to the adopted report of the measurement data. If so (the YES), performs the steps 902-906. These stages correspond to the stages 305-309 Fig. 3A, and therefore not described in detail here, except for the steps 904 and 906. At step 904 matching unit 1001 transmits the signal to the decoder 1003 COCK/COAG, setting the order of identification bearing CGS allocated at step 903. In connection with a given order matching unit 1001 instructs the decoder 1003 COCK/COAG that the identification of the carrier CR is a high priority.

At step 906 matching unit 1001 transmits to the device 1004 e-mail slowly connected the control channel (MPKA) signal containing the data for those bearing CGS that were selected at step 905.

After step 906, or if at step 901, it was found that the adopted report of the measurement data does not match what the measuring period has ended (NO result), then passes run 907-910. These stages correspond to the stages 312-315 in Fig.3A, and therefore here are described in detail, with the exception of step 910. At step 910 matching unit 1001 sends to the decoder 1003 COCK/COAG signal that specifies the order of identification bearing CGS allocated at step 908 or 909. Because of the izkuyu priority.

When the decoder 1003 COCK/COAG has identified the carrier CR, the matching unit receives from the decoder COCK/COAG signal containing the identity, that is, the data identification code of the base station (OCBS) to the carrier CR. Even in the case where the decoder 1003 COCK/COAG established the interruption or failure of identification, in the matching unit 1001 sends a signal containing information about the event.

There are several different ways to predict what carrier the broadcasting control channel (RKU), probably soon will be among the most powerful bearing RKU, which must be passed the message on the measurement data. Therefore, there are several options for implementing the method of the invention, in addition to the method illustrated in Fig.3A and 3B. Hereinafter will be described in some additional embodiments of the invention.

The block diagram of the process shown in Fig.3A (which was described above) and Fig.3B shows an example of the second variant of the method according to the present invention.

In Fig. 3B stages 316-317, 320 ways fully consistent with the stages 310-311 and 315 in Fig.3B and therefore not described in detail here with reference to Fig. 3V. The profile is a step 318 of Fig.3B average signal levels are determined for the sub-periods for all bearing RKU. Then, at step 319, the average values of the signal levels for all bearing RKU by the last sub-periods are compared with each other. If any of the six most powerful supporting the broadcasting control channel (RKU) is unknown, it is predicted that this carrier RKU would probably soon be one of the most powerful RKU, considering the average values of the signal levels at the measuring period, and therefore, the carrier CR is allocated for identification (the result is YES), which is then initiated at step 320. If unidentified be more than one of the six most powerful bearing RKU, that stands out the most powerful of these carriers. After step 320, or if at step 319 was not detected unidentified carrier RKU among the six most powerful bearing (the result is NO), the procedure returns to step 317 and waits for the next sub-periods.

It is assumed that the method of the invention, described with reference to Fig.3A and 3B, is implemented in the network depicted in Fig.1A and 1B, Fig.5A-5G illustrate variations of the average values of signal levels on poderiam FG1-PP in Fig. 4. Fig.5 shows that an unidentified carrier radio control channel RCU is among the six most powerful bearing RKU is part of the control channel RCU at time T4 in Fig. 4. This can be compared with known mobile station, which in such circumstances initiates the identification carrier radio control channel RCU after time T5 in Fig.4. (See the above description with reference to Fig.7A and 7B).

The third variant of the implementation shown in Fig.3D. This type of exercise is most easily described in conjunction with Fig.3A as a starting point. Includes all the steps 301-309 in Fig.3A. Change present in Fig. 3G compared to Fig.3A, is a new stage 321, inserted between the step 306 (NO result) and step 308. This means that if at step 306 it was not detected unidentified carrier broadcasting control channel (CMR) among the most powerful bearing RKU (NO result), then at step 321. At step 321, the average value of signal levels for period measurement is compared to each of the unidentified bearing RKU, with an average value of signal levels in the immediately preceding period of measurement. If the average value of signal levels for any of the bearing RKU increased by a value greater than a predefined threshold value (the result is YES), it is predicted that this carrier radio channel control the on period of the measurements (the YES), which leads to the identification of the carrier CR at step 307. Otherwise (the result is NO), the procedure goes to step 308.

Mobile station for use with methods corresponding to the invention described with reference to Fig.3A, 3B and 3D, respectively, can be easily implemented using as a starting point for a mobile station MS described with reference to Fig.8-10. Only the feature matching unit of Fig.10 should be slightly modified. Necessary modifications obvious to a specialist.

The invention is applicable to communication networks like global system for mobile communications (GSM) or types of systems derived from GSM, including the types of networks DCS 1800 (data transmission system) and PCS 1900 (personal communication system), which is a variant based on the GSM system.


Claims

1. The way to enable the mobile station to transmit the message data measurements for cells located in the vicinity of the active cell designed for use in a network such as global system for mobile communications (GSM) or derived from the GSM system, and mentioned the network contains a number of base transceiver stations (BPS-BPS) and mobile hundred the and connection for communication between the first base transceiver stations (BPS) and the mobile station, division (302) time after selection of the communication channel, for consecutive periods of measurement (PI-PI), then duplicate the image stages: measurement (303) in the mobile station of the levels of the signals carrying the broadcasting control channel (RCU-RCU) transmitted by the base transceiver stations (BPS-BPS) located in the vicinity of the first base transceiver station (BPPS), determining (305) averages (701) signal levels measured for each of the load-carrying radio control channels (RCU-RCU) during each period of measurement (PI-PI) and determining (306), it is unknown whether any of the supporting broadcast control channels (RCU-RCU) with the highest signal level, at the end of each measuring period, initiation (307) identification of unidentified bearing radio control channels (RCU-RCU), leading to reading mobile station identification information (OCBS) transmitted by using the carrier broadcast control channels (RCU-RCU), transmission (309) in the first base transceiver station (BPPS), after completion of each period of measurement (PI-PI), average values (701) signal levels the most powerful op what are the stages: separation (310) specified periods of measurement (PI - PI) payperiod (FG1-PP), repetitive manner until any communication channel having a suitable signal level, among the unidentified bearing RKU (RCU-RCU), perform the following steps: forming (312) averages (501) signal levels for each of these podpriatov (FG1-P), measured for those specified bearing radio control channels (RCU-RCU), which are unknown, the selection (313, 314, 319, 321) unidentified carrier radio control channel, which, as predicted on the basis of the measured average values (501) signal levels within podpriatov (FG1-PP), soon to become one of the most powerful bearing RKU; initiation (315) identify selected carrier radio control channel, leading to reading, by the mobile station, identification information identification code base transceiver station transmitted mentioned carrier radio control channel transmission (309) on the first base transceiver station after periods (PI - PI) measurement of the average value (701) signal level for newly identified carrier radio control channel, in addition to crenicichla.

2. The method according to p. 1, characterized in that the above prediction is based on a comparison of how the average (501) of the signal level of the sub-periods mentioned unidentified carrier radio control channel is changed between at least two points in time.

3. The method according to p. 1 or 2, characterized in that the above prediction is based on a comparison of the average values (501) of the signal level of the sub-periods mentioned unidentified carrier radio control channel for the last sub-periods (PP-PP) of these measurement periods with an average value of signal levels of the sub-periods mentioned unidentified carrier radio control channel for the previous sub-periods of measurement (FG1-TEP), leading to the prediction that mentioned bearing broadcasting control channel will soon become one of the most powerful bearing RKU, when the change (601) average (501) signal levels on the sub-periods exceeds a predetermined threshold value (604).

4. The method according to p. 3, characterized in that the previous payperiod (FG1-ASP) are immediately previous poduridae.

5. The mobile station intended to communicate with the base pickup is S, containing the means of communication for communication with the first mentioned base transceiver stations via dedicated communication channel, the measurement tool to measure levels of radio signals carrying control channels (CGS) that are transmitted to the base transceiver stations located in the vicinity of the first base transceiver station, the first means of averaging to determine the average values of the signal levels measured on each of the bearing radio control channels during each of a sequence of periods of measurement (PI-PI), a means of identification to determine the identity of one of the mentioned bearing broadcasting control channel by reading the identification information, this portable carrier radio control channel, means for transmitting messages on measurement data for transmission, after one of these periods of measurement (PI-PI), average values (701) signal levels identified most powerful bearing RKU, first base transceiver station via communication means, wherein said mobile station further comprises means to provide the n signal levels, should soon be one of the most powerful bearing RKU taking into account the average values (701) signal levels for one of the periods of measurement (PI-PI), and referred to the means of identification is made with the possibility of starting up an unidentified carrier radio control channel that was selected.

6. Mobile station under item 5, characterized in that the said means of selection is made with the possibility of choosing this dedicated carrier broadcasting control channel (CGS) on the basis of comparison of how the average value representing the signal level is referred to an unidentified carrier radio control channel is changed between at least two points in time.

7. Mobile station under item 5, characterized in that the said allocator is arranged to allocate mentioned selected carrier broadcasting control channel (CGS) based on comparisons of the mean values (701) signal referred to an unidentified carrier radio control channel in the last mentioned periods (PI) measurement with the average value (701) signal unidentified carrier broadcasting Kanaloa unidentified carrier radio control channel is soon to become one of the most powerful bearing RKU, if the change of the average value (701) level of the signal exceeds the threshold value.

8. Mobile station under item 5, wherein said mobile station further comprises second means of averaging to determine average values (501) for podpriatov (FG1-PP) mentioned periods of measurement (PI-PI) for signal levels measured at least for those of bearing radio control channels, which are unknown, these allocator is arranged to allocate mentioned selected carrier broadcasting control channel (CGS) based on comparisons of the mean values (501) a signal referred to an unidentified carrier radio control channel in the last mentioned podpriatov average (501) signal unidentified carrier radio control channel in the previous sub-periods, and it is predicted that these unidentified carrier radio control channel is soon to become one of the most powerful bearing RKU, if the change (601) average value of signal levels exceeds the threshold value (604).

9. Mobile station under item 5, atricauda the average values (501) for podpriatov (FG1-PP) mentioned periods of measurement (PI-PI) signal levels, measured for the above-mentioned bearing radio control channels, and mentioned allocator configured to allocate the selected carrier radio control channel based on the fact that these unidentified carrier CR is one of the most powerful bearing RKU comparison of average values (501) of the signal level for the last mentioned podpriatov.

 

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EFFECT: higher efficiency.

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FIELD: mobile communications.

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4 cl, 13 dwg, 2 tbl

FIELD: communications engineering.

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22 cl, 3 dwg, 4 tbl

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19 cl, 5 dwg

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14 cl, 4 dwg

FIELD: communications engineering.

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11 cl, 7 dwg

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EFFECT: higher precision, broader functional capabilities, higher efficiency.

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