Cellular mobile telephone system

 

(57) Abstract:

Cellular mobile telephone system of the type mdvr has several moving objects radio, which is connected via radio to the communications network that includes a base station radio. The exchange of control signals and signaling between the base station and mobile and radio communication is performed using at least one signal stream, additional employee to maintain a physical connection. The second signal stream further ensures the transfer of certain amount of data (short service message) that are not related to maintaining the connection. The device of premature interruption of communications intended to terminate the physical connection, use offline, when it comes to the level of data link (level 2), when the control device of the first signal stream indicates a faulty connection that is a technical result. 18 Il.

The invention relates to improvements in cellular mobile phone systems MDR (multiple access with time division multiplexing), which uses a layered Protocol to fit In the European GSM system (special experts for mobile communications) mobile cellular networks with mobile objects all traffic (traffic in data networks) and the alarm signals are transmitted in digital form and in accordance with the method mdvr. The exchange of information and transmission of alarm signals simultaneously via radio channels between the base stations BTS and the mobile stations MS in the form of data packets (NB), which for example include 156, 25 bits, as shown in Fig. 1a. Package NB begins with three start bit (TB), followed by sequentially 58 bit of a message is encrypted, 26-bit, included in the installation sequence, 58 bits of the message (encrypted) and three stop bits (TB). Defensive interval (GP) respectively allocated to 8.25 bits between two interconnected successive packets. Thus, the entire packet will have a sequence 156, 25 bits, which corresponds to the time interval 0,577 MS. The package of data from different channels are consecutively supplied to the radio, where they form the frames of the information prepared by the method mdvr, out of every 8 data packets as shown in Fig. 1b. Interconnected sequentially transmitted frames in the same time segment, for example in the second time segment, channel, such as a trafc channel (TCH). For example, such data packets contain voice information in compressed digital form, and one of 26 packets transmitted over the air, reservere">

As shown in Fig. 2, the exchange of information in accordance with the above description is only possible between any of the mobile station MS and the base station BTS, for example, during transmission of voice information, which is encrypted or decrypted in MS and BTS, or between the mobile station MS and the switching center in the network of the mobile communication MSC via the base station BTS and the base station controller BSC, for example in the time allocated to the transmission of certain alarm.

The protocols contain all the elements that belong to the unlocking compounds, more specifically to the unlocking of the connection, which takes place at the end of the session, but which is the result of premature termination due to poor link quality or other abnormal condition and which is observed at the physical or data link, which, according to the OSI reference model, is a level situated directly above the physical level. These levels in the GSM system, which is noted above, the loss of connection, shown in Fig. 3 and designated as L1, L2A, L2B. These levels relate to the transmission of information over a physical channel (Protocol L1) and also signals the alarm, IP and data short service messages (SMS Protocol L2B).

In the current GSM system (as amber 1992) a violation of L1, L2A and L2B will lead to premature termination of the physical connection. It takes place in the mobile station after the transmitter is turned off and the base station, or in the orderly disconnection of the connection, which simultaneously ensures disconnection of the mobile station MS, or the transmitter is turned off. Suppose (Fig. 5), which was set channel TCH traffic. The criterion for loss of communication, acting at the level of L1, is a display case of violation from the gas meter "bad trash", which is the specified number and which performs counting on the unit of account for each accepted with infringement of the connection frame transmission, piped SACCH, and which performs a direct account of two units of account for each correctly adopted the frame of the traffic, informing channel SACCH (see Fig. 5.1). The criterion of failure at the level of L2A is the lack of confirmation sent by the control channel accelerated access (FACCH) when a certain number of short service messages, for example 34. The criterion for the appearance of the characteristic connection problems at the level of the L2B is the absence of confirmation, the floor is Fig. 5.2). As mentioned earlier, the break in the connection at any of the levels L1, L2A, L2B finishes so premature interruption of the connection, i.e. the connection is forcibly terminated.

In Fig. 5.1 is depicted in more detail how you control at the physical layer L1, using counter "bad trash". When the session resumes communication with the passage either a new call or a new mode of operation (step 511), the variable A is assigned the value of PTL (relative value) (step 512). If not accepted sign SACCH (during the execution of step 513 and after step 514 appears the answer is NO), the variable A is reduced discrete unit of account (during the execution of step 516). After this is checked (step 517), in order to ascertain as to whether the variable A in the discrete subtracting negative or zero values. If A variable has reached an installed condition, the communication is interrupted during the execution of step 518). If monitoring indicates that A variable has not reached zero values during the execution of step 517, the procedure is repeated from step 513. Every time necessarily taken the sign on the channel SACCH, if after the execution of step 514 appears the answer is YES, then pechonkina connection.

In Fig. 5.2 in more detail is reproduced, the control process at the level of the data channel, when scanned channels L2A and L2B. In this case, when the information comes from higher levels, usually with level 3 (step 521), the information is transmitted at a time point which is determined by the Protocol (step 522). Begins the process time control (step 523) and, if not received confirmation within the time period T200 (output NO), the variable R is assigned a value of zero or it is re-set to zero during the execution of step 524 in order to ensure readiness for operation of counting the number of consecutive retransmissions in the absence of a binding confirmation, with the first of these programs is carried out in step 525.

If confirmation is received within a predetermined time interval T200 to step 523, the output is selected the answer is YES and transmission of information continues. The reception confirmation is checked again to step 526 (compared to step 523) and, if confirmation is not received within a predetermined time interval (output NO), a test is performed to ensure that the number of re-transmissions on the R discretely incremented account (step 529) and the next retransmission data. If the answer during the execution of step 527 is positive, then comes the premature termination of the connection (step 528). It should be noted that the scheme procedures are identical for the two channels L2A and L2B, which are the channels of communication, implemented at the level of the data channel (the second level), although delay (T200) and the maximum number (N200) the variable R is different for these two channels. Typical values for L2A is T200 170 MS, N200 = 34 and L2B T200 900 MS, N200 = 5, which leads to downtime on 5,78 and 4.5, respectively.

Below summarizes the various control processes. For level L1 (Fig. 5.1) controlled the operation of the physical layer even in a time when information is transmitted, for example, when there is a long pause in the conversation.

For level L2A (Fig. 5.2) is controlled by the alarm, for example, when you install and open the connection and switch the channel.

For level L2B (Fig. 5.2) the conversation is controlled in the case when it consists of sending short messages.

If data is used by the mobile station MS, the control of speech in this system. The subscriber terminates the call if it assumes that the connection obesity data are monitored at higher levels, than the second level.

Description of the GSM system, which is made by a company Ericsson, can be found in the document "CME 20 Training Document", with the designation assigned by the company Ericsson EN/LZTI20226/2 of the RIA. Reference is made to the appropriate section listed in the specifications according to the requirements of the GSM system, with details that relate to the present invention: 05.01/05.02 to describe the physical level; 05.08 for describing control of the physical layer (using a counter-type thin basket"); 04.05/04.06 to describe protocols of data transmission channels (this applies to levels L2A and L2B); section 3.5.2 part 04.08 for the description sold "logic premature termination of communication."

A similar system is described in section 9.2, "Reference model of open systems interaction OSI" publication "communication Systems" ed. C. I. Vasiliev, A. P. the Burkin, C. A., Sviridenko, M.: Vysshaya SHKOLA, 1987, S. 216-222.

This system both on the task and achieved technical result is the closest to the claimed invention.

The above interaction protocols, due to the interruption of the connection, in some cases, has drawbacks. In Fig. 4 depicts the first case, for which switch the connection but it is interrupted due to the fact that no acknowledgement is received after a certain time; for example, made five attempts signaling signaling channel data at the level of the L2B after termination of the physical connection. In Fig. 4 plays curve quality alarm Q, as a function of time T. the Word "quality" in Fig. 4 means either random private BER (error rate in bits), or the intensity of the signal SS, or random private relationship of carrier to interference (C/I). Shown in the figure, the curve with negative slope has a point S, which starts the procedure of premature termination, and the point P, in which premature termination should take place, if the connection has not been interrupted at some point between S and P.

The blocks 51, 52 and 53, shown in Fig. 5, indicate the control on the physical levels L1, L2A, L2B, respectively, whose outputs control modules indicate the presence of faults, i.e., the corresponding module for levels L1, L2A and L2B diagnose the failure. Circle numbers 54 and 55 indicate the execution of a function OR a block 64 indicates that the corresponding connection is interrupted when L1, L2A and L2B reveal themselves in the exchange of data.

place this interrupt occurs, the data transfer on the same line. For example, there is the possibility that the redundancy or the ability to repeatability in the data transfer will be greater than when the signaling Protocol L2B, and thus breaking the connection prevents the continuation of acceptable communication.

The present invention is based on the assumption that interruption of compounds with low transmission quality, to be able to re-use resources for other connections, this connection should not be interrupted, if there is a connection that is still functioning in any continuing use, and so far attempts to keep the connection with the operating mode is changed or the preparation for it.

The present of the invention is to provide a method associated with disorders of the connection when transmitting control signals in cellular systems with mdvr that use different alarm levels according to the description of the types in the system BOC (reference model of open systems interconnection) (OSI), guideline x 200 and x 210 MKKTT) and method that satisfy the above objectives.

The present invention also includes consideration of the level Kahn the new station BSC, switching centers in a communication network with mobile objects MSC and the mobile terminals MS, which at the time of interrupt traffic only if the Protocol (L2A) appears to fail, which is connected with the establishment or data transmission over the physical channel.

The present invention is to use the dividing of the flow shown in Fig. 6, instead of the known flow depicted in Fig. 5. Obviously, the separation can also be initiated by the levels located above the level of the data channel. However, the present invention relates only to the level of the data channel.

The invention is further illustrated by examples of its implementation with reference to accompanying drawings.

Fig. 1 depicts a normal package (a), the frame mdvr (b) and multiframe channel traffic (c) when they appear in the GSM system.

Fig. 2 is a hardware configuration according to the present invention.

Fig. 3 - minutes of radio channels (L1, L2A, L2B) of the present invention.

Fig. 4 depicts how the regime change channel traffic stops premature termination of the communication initiated by the Protocol L2B.

Fig. 5 - strukturalne in the modern system GSM (January 1992).

Fig. 5.1 - flowchart for the sequence of interruption of communications at the physical layer (L1).

Fig. 5.2 block diagram for the sequence of interruption of communication used at the level of the data channel (L2A and L2B).

Fig. 6 is a block diagram illustrating the connection interrupted in the event of a breach of communication according to the present invention.

Fig. 7 is a block diagram of a mobile station according to the present invention.

Fig. 8 is a functional block diagram of the systems of the base station according to the present invention.

Fig. 1, 2, 3, 4, 5, 5.1 and 5.2 refer to the prior art and described above.

The best variant embodiment of the invention.

In Fig. 6 shows a flowchart diagram that illustrates the connection interrupted in the event of a failure in data transmission in accordance with the present invention. Interruption of the connection in case of failure is premature interruption of the connection that occurs when communication ended normally. The connection is interrupted, when there is no need in it, as held by this connection resources can be returned to the free state and reused in this case, along with other compounds. The blocks 61 and 62, p what happened to fail, i.e., that at the appropriate levels L1 and L2A is detected by the disruption. Circle 63 represents a function OR a block 64 indicates that the corresponding connection is interrupted when one of the blocks or 61 or 62 has at its output operating condition. The method, illustrated in Fig. 6, means that the separation of communication begins either with the physical layer, or Protocol layer data transmission channel, which is associated with maintaining a physical connection (setting, switching the channel, and so on) (L2A).

In Fig. 7 shows a block diagram of the mobile station in accordance with the present invention. The mobile station 700 is the antenna 710. The transmitter 720 is connected to the antenna 710 and is controlled by the control unit transmitter 752, which is additionally able to perform premature disabling of the transmitter. A transmitter connected to the processing unit of the signal 740. The receiver 730 is also connected to the antenna and participates in the temporary distribution together with the transmitter. The receiver 730 is also connected to the processing unit of the signal 740. Equipment used for modulation, demodulation and correction, is in blocks 720 and 730. The signal processing unit 740 consists of Ostroga signal. The processing unit of the signal 740 is also connected to the microphone and the loudspeaker included in block 741, and the logic control 750. In turn, the logic control unit 750 is connected to the control unit transmitter 752 and to the block input and output data 753, which is compatible with the signals received from the keyboard and entering the display, prisoners in block 760.

The present invention is implemented in the form of data or in the form of a sequence of program commands in the logic control unit 750 and indicated by the numeral 751 (logic premature termination of a communication session). The control unit controls the physical layer L1 using a programmed counter type thin basket", which is well known in telecommunications systems and whose work is shown in Fig. 5.1. This logic controls the transfer, which, among other things, is involved in the connection establishment and connection change (at the level L2A), as is evident from Fig. 5.2. When either L1 or L2B requires premature disconnection, block 751 instructs the block 752 to do this interrupt.

In Fig. 8 is a block diagram illustrating a system base station. This izopet is a of Fig. 8. The apparatus shown in Fig. 8, in addition may also be distributed among several separate units, for example between the base station BTS and the base station controller BCS. In order to reveal both examples, the functional block diagram depicted in Fig. 8, is called by the system base station BSS. Block 800 system BSS has three antennas, two of which, 810 and 812 are used for receiving signals, while only one antenna 811 is used for transmitting signals. The transmitter 820 is connected with the antenna 811 and is controlled by the control unit transmitter 852, which additionally is capable of interrupt and forced shutdown of the transmitter. The transmitter is also connected to the processing unit of the signal 840. Receiver 830 is also connected to the processing unit of the signal 840. Radio equipment intended for performing modulation, demodulation and correction, is in blocks 820 and 830. The signal processing unit 840 is a device for encryption, decryption and processing the speech signal of the radio channel transmitted in the incoming and outgoing directions. The signal processing unit 840 is also connected to the adapter block PCM line and to the logic control unit 850. In turn, the logical block is the R or sequence of program commands in the logic control unit 850 and numbered 851 ("interrupt logic"). The logic control unit controls the physical layer L1 using programmable counter type Thin basket", which is well known in the art of telecommunications and controls the transfer, which among other things, refers to the connection and to change the connections (L2B). If you want to interrupt either L1 or L2B, the unit 851 manage unit 852, which carries out this interrupt. The adapter module PCM-line 860 is connected to the network through one or more PCM lines.

Cellular mobile telephone system multiple access time division channels mdvr, which uses alarm, structurally implemented at the levels of the reference model of open systems interconnection OSJ, containing several mobile radio unit connected through radio channels with the base stations included in the network communication and the exchange of signals signaling between the mobile radio unit is at least one first stream of signals, providing additional preservation of the physical connection, and through the second flow signals, additionally providing for the transfer of certain data that is not associated with maintaining a physical connection, different t is the possibility of control of the levels of physical connection, the correctness of the transfer and termination of connections, taking into account levels of data transmission channels, only in the case of fixing connection problems specified logical blocks control the first flow of signals.

 

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