CN1977471B - Base station and mobile unit of mobile wireless communication system, and regulation control method of mobile wireless communication system - Google Patents

Abstract

A wireless access inhibition can be ensured even for such mobile units that ignore regulation signals for regulating wireless accesses. There are included a control channel transmission/reception control part for controlling control channel transmissions and receptions; a control slot construction/separation part for performing control physical slot constructions and separations based on a control of the control channel transmission/reception control part; a traffic concentration determination part for monitoring the traffic status of wireless lines to determine whether the traffic is concentrated; and a unique word pattern storage part for storing a unique word pattern to be designated when the control channel transmission/reception control part sends a control physical slot construction request to the control slot construction/separation part. When regulating the accesses from mobile units to the base station based on the monitor result of the traffic concentration determination part, the control slot construction/separation part changes the unique word pattern to be set in the control physical slot to a pattern other than the patterns as specified in standards.

Description

Base station of mobile radio communication system, mobile machine, and limitation control method of mobile radio communication system

technical field

The present invention relates to a mobile wireless communication system constituting a base station, a mobile device, and a mobile wireless communication system restriction control method for restricting the use of a wireless line between the base station and the mobile device. the

Background technique

Recently, various mobile wireless communication systems are operated by a plurality of communication carriers, and the number of users thereof is further increasing. In addition, on the user side, the frequency of use has increased due to its convenience, and communication traffic has also increased rapidly due to the diversification of use forms such as mail and content services. the

Not limited to mobile wireless communication systems, in communication systems, if calls and traffic are concentrated in a specific area, the communication path will be in a congested state, making it difficult to communicate. In particular, due to the mobility of mobile devices in mobile wireless communication systems, for example, in conference venues, entertainment facilities, etc., there are situations where calls are concentrated on specific base stations, and measures (limitation control measures) must be implemented to disperse these concentrated calls. Or abort some connections. the

Under such circumstances, as a conventional mobile wireless communication system for the purpose of distributing the traffic concentrated at a specific base station to other base stations, there is the following Patent Document 1 and the like. The mobile wireless communication system disclosed in this Patent Document 1 includes a control device in the base station for detecting a traffic concentration state exceeding a predetermined communication channel due to the concentration of a plurality of terminals in the formed communication area of the own base station. In this detection, an instruction is issued to increase the signal level of the surrounding base stations while reducing the control channel signal level of the own base station, and to increase the signal level in accordance with the instructions from the surrounding base stations. the

In this mobile radio communication system, when many mobile units are concentrated in a service area, in order to prevent the mobile unit from being difficult to use the mobile communication service due to the frequent use of radio resources of the base station, if the base station The traffic concentration detection unit provided therein detects the access concentration from the mobile unit, and requests the restriction signal transmission unit included in the base station to transmit a restriction signal so that the mobile unit does not use radio resources. Mobile machines in the service area constituted by the base station determine that the radio resources cannot be utilized in the service area due to the restriction signal sending part sending the restriction signal, and do not perform wireless access (this method is called "limitation control of sending restriction signal") Way"). the

In this mobile radio communication system, when the traffic concentration detecting means included in the base station detects the concentration of access from the mobile device, it requests the control channel on/off means included in the base station to stop transmission of the control channel. The mobile station in the service area constituted by the base station determines that the service area does not exist because the control channel on/off unit stops the control channel transmission, and does not perform wireless access (this method is called "on/off based on the control channel"). Restricted Control Mode"). the

Patent Document 1: Japanese Patent Laid-Open Publication No. 9-163435

However, in the conventional wireless communication system for mobiles disclosed in the aforementioned Patent Document 1, etc., in the barring control method that transmits the barring signal, when the mobile station cannot understand the barring signal transmitted, or ignores the barring signal In the case of , there is a problem that the limit control does not work, and the load on the base station where the traffic is concentrated cannot be reduced. the

In addition, in the restriction control method based on ON/OFF of the control channel, if the base station stops the control channel for restriction, the service area constituted by the base station does not exist. Therefore, while the base station stops transmission of the control channel, the When a new base station constituting a service area starts to operate at the same position as the service area originally constituted by the base station, there is a problem that interference is detected in the base station when the restriction is to be lifted, and in order to utilize the original service area It takes more than the specified time, or the original service area may not be available. the

Contents of the invention

In view of such a situation, a first object of the present invention is to provide a mobile radio communication system capable of reliably stopping radio access even if a mobile terminal ignores a restriction signal for restricting radio access. the

In addition, a second object is to provide a mobile radio communication system capable of reliably and quickly restoring service after the restriction is released without losing the control channel transmission timing in the service area even when the restriction control is being performed. system. the

In order to solve the above-mentioned problem and achieve the object, the base station of the present invention is characterized in that: in the base station constituting the mobile radio communication system that synchronously establishes wireless lines with a plurality of mobile machines based on a unique word pattern, It is equipped with: a control channel transmission/reception control unit for controlling the transmission/reception of the control channel; and a control slot combining/separating combination/separation of physical time slots (slots) for control based on the control from the control channel transmission/reception control unit. Separation means; monitor the traffic state of the above-mentioned wireless line, and detect whether the traffic concentration is concentrated detection means; store the above-mentioned control channel sending and receiving control means when requesting the physical time slice for control to the above-mentioned time slice combination/separation means for control The unique word pattern storage means of the unique word pattern specified when combining, wherein the above-mentioned time slice combination/separation means restricts access to the base station from the mobile machine based on the monitoring result of the traffic concentration detection means. The pattern of the unique word set in the control physical slot is changed to a pattern other than the pattern specified in the standard specification. the

According to the base station of the present invention, when the wireless access from the mobile station is to be limited, the unique word pattern of the control channel transmitted so far is changed to a pattern other than the standard and transmitted, so the mobile station cannot recognize the control channel, and it is possible to reliably effectively stop using the radio resources of the base station. In addition, since radio waves are transmitted without changing the frequency and timing already transmitted by the control channel at the time of restriction, it is not necessary to reacquire the transmission timing of the control channel when the restriction is released, resulting in the effect that the service can be restored quickly. the

In addition, according to the mobile machine of the present invention, when the unique word pattern detected from the received signal coincides with the unique word pattern stored in the unique word pattern storage unit, the mobile machine stored in the synchronous communication with the base station Among the plurality of unique word patterns in the base station, the unique word pattern used by the base station is selected, thereby producing the effect that the restriction control that divides the mobile units in the system into a plurality of restricted groups can be reliably realized. the

In addition, according to the restriction control method of the mobile radio communication system of the present invention, when the radio resources of the base station are congested and the access from the mobile device to the base station is restricted, the control transmitted by the base station is included in the control method. Changing the unique word pattern in the channel is a step of changing the unique word pattern to a pattern other than the one specified in the standard specification, so that the mobile device cannot recognize the control channel, and it is possible to reliably stop using the radio resource of the base station. In addition, since radio waves are transmitted without changing the frequency and timing already transmitted by the control channel at the time of restriction, it is not necessary to reacquire the transmission timing of the control channel when the restriction is released, resulting in the effect that the service can be restored quickly. the

Description of drawings

FIG. 1 is a block diagram showing a transmission and reception functional configuration of a base station of a mobile radio communication system according to Embodiment 1 of the present invention. the

2 is a diagram showing a configuration example of a unique word pattern stored in the unique word pattern storage unit 6 of the base station 1 and used by the base station 1 according to the first embodiment. the

Fig. 3 is a diagram showing a unique word pattern of a physical time slice for control stipulated in the second generation uncoded telephone system standard specification (RCR STD-28). the

FIG. 4 is a diagram showing a bit structure of a physical slot for downlink (base station → mobile station) control. the

FIG. 5 is a block diagram showing a control channel transmission/reception functional structure of a mobile device in the mobile radio communication system according to Embodiment 1 of the present invention. the

FIG. 6 is a conceptual diagram showing a system configuration and a communication line configuration of a general mobile radio communication system. the

Fig. 7 is a block diagram showing a transmission and reception functional structure of a mobile device in a mobile radio communication system according to Embodiment 2 of the present invention. the

FIG. 8 is a diagram showing a configuration example of unique word patterns stored in unique word pattern storage section 16 of mobile station 2 according to the second embodiment. the

FIG. 9 is a diagram showing a configuration example of a unique word pattern stored in the unique word pattern storage unit 6 of the base station 1 according to the second embodiment. the

Fig. 10 is a sequence diagram showing the operation of the mobile radio communication system according to the second embodiment. the

Fig. 11 is a flowchart showing the operation of the mobile device of the mobile radio communication system according to the second embodiment. the

Fig. 12 is a signal space diagram showing the arrangement of symbols on the phase plane by the π/4 shift QPSK modulation method used in the portable telephone system (PHS). the

Fig. 13 is a diagram showing a differential encoding rule of π/4-shift QPSK. the

Fig. 14 is a diagram showing symbol transition in the π/4-shift QPSK modulation system. the

Symbol Description

1, 1a, 1b, 1c: base station, 2, 9: control channel transmission and reception control unit, 3, 10: time slice combination/separation unit for control, 4, 11: wireless modem unit, 5: centralized traffic detection Parts, 6, 16: unique word pattern storage parts, 7, 12: sending and receiving antenna, 8: mobile machine, 13: unique word pattern detection parts, 14, 14a, 14b, 14c: service area, 15: network

Detailed ways

Hereinafter, the base station constituting the mobile radio communication system, the mobile device, and the restriction control method of the mobile radio communication system for restricting the use of the wireless line between the base station and the mobile device according to the present invention will be described in detail with reference to the drawings. Example. In addition, this invention is not limited by this Example. the

Example 1

FIG. 1 is a block diagram showing a transmission and reception functional configuration of a base station of a mobile radio communication system according to Embodiment 1 of the present invention. The base station 1 of the mobile wireless communication system shown in this figure has a control channel transmission and reception control unit 2, a control time slice combination/separation unit 3, a wireless modem unit 4, a traffic concentration detection unit 5, and a unique word pattern memory. Part 6, sending and receiving antenna 7. the

Next, the general function of each of these components will be described. In FIG. 1 , a control channel transmission and reception control unit 2 controls the transmission and reception of the control channel of the base station 1 . The control time slice combination/separation unit 3 combines the physical time slices for control according to the control from the control channel transmission and reception control unit 2, and transmits the combined physical time slices for control to the wireless modem unit 4, or The control signal is separated from the received physical slot for control and sent to the control channel transmission/reception control unit 2 . The wireless modem unit 4 performs predetermined modulation in order to transmit the control physical time slice constituted in the control time slice combination/separation unit 3 as a radio wave, or demodulates the received radio wave, and converts the physical time slot for control The slices are sent to the time slice combination/separation unit 3 for control. The traffic concentration detection unit 5 monitors the traffic state of the base station 1, and detects whether or not the traffic is concentrated. The unique word pattern storage unit 6 stores the unique word pattern specified when the control channel transmission/reception control unit 2 requests the control slot combination/separation unit 3 to combine physical slots for downlink control. The transmitting and receiving antenna 7 transmits and receives the control channel modulated by the wireless modem unit 4 as radio waves. the

Fig. 2 is the figure that shows embodiment 1 to be stored in the unique word pattern storage part 6 of base station 1 and the figure of the constitution example of the unique word pattern that base station 1 uses, and Fig. 3 shows the second generation codeless telephone system standard specification (RCR STD -28) A map of the unique word pattern of the physical slot for control specified. In Fig. 2, the standard pattern, for example, represents that it is composed of unique word patterns as shown in Fig. 3, and the non-standard pattern refers to a bit sequence different from the unique word patterns as shown in Fig. 3, for example, by all "0" or all A bit pattern of "1" etc. constitutes. the

FIG. 4 is a diagram showing a bit structure of a physical slot for downlink (base station → mobile station) control. The bit structure of the physical slot for control shown in the figure is from the left, the lamp time bit (R: 4 bits) for transition response, and the start sign bit (SS: 2 bits) as the header bit. and control signal bits (CAC: 62 bits), synchronization word (unique word) bits (UW: 32 bits), control signal bits (CAC: 108 bits), cyclic symbol check bits (CRC: 16 bits), and moving body The bits unique to the radio communication system are a bit string consisting of a total of 240 bits of masking bits (16 bits) for canceling the influence of fading. In addition, in FIG. 4, the above-mentioned unique word pattern is set at a position marked "UW". the

FIG. 5 is a block diagram showing a control channel transmission/reception functional structure of a mobile device in the mobile radio communication system according to Embodiment 1 of the present invention. The mobile device 8 of the mobile wireless communication system shown in the figure includes a control channel transmission and reception control unit 9 , a control slot combination/separation unit 10 , a wireless modem unit 11 and a unique word pattern detection unit 13 . the

Next, the general function of each of these components will be described. In FIG. 5 , the control channel transmission and reception control unit 9 controls the transmission and reception of the control channel of the mobile device 8 . The time slice combination/separation unit 10 for control combines the physical time slices for control according to the control from the control channel transmission and reception control unit 9, and transmits the combined physical time slices for control to the wireless modem unit 11, or The control signal is separated from the received physical time slice for control and sent to the control channel transmission/reception control section 9 . The wireless modem unit 11 performs predetermined modulation in order to transmit the control physical time slice constituted in the control time slice combination/separation unit 10 as a radio wave, or demodulates the received radio wave, and transfers the control use physical time slice The slices are sent to the slice combining/separating unit 10 for control. The unique word pattern detection unit 13 detects the unique word of the signal received from the wireless modem unit 11, and achieves wireless synchronization with the base station 1 shown in FIG. 1 . The transmitting and receiving antenna 12 transmits and receives the control channel modulated by the radio modem unit 11 as radio waves. the

FIG. 6 is a conceptual diagram showing a system configuration and a communication line configuration of a general mobile radio communication system. In this figure, a plurality of base stations 1 (1a, 1b, 1c) connected to a network 15 providing communication services constitute service areas 14a, 14b, 14c, respectively. Also, a plurality of base stations 1a, 1b, and 1c provide predetermined services to mobile devices 8 (8a, 8b, and 8c) located at arbitrary positions in service areas 14a, 14b, and 14c, respectively, within service areas 14 provided by themselves. the

Next, the operation of the mobile wireless communication system of this embodiment will be described using FIG. 1 , FIG. 5 and FIG. 6 . In Fig. 1, the information of the control channel that should be transmitted from the base station 1 is formed into a control signal by the control channel transmission and reception control unit 2, and the control signal is sent to the time slice combination/separation unit 3 for control to form a physical channel for downlink control. time slice. At this time, the unique word pattern selected from the unique word pattern storage unit 6 is set in the physical slot for downlink control. In this way, the selected unique word pattern is set in the unique word portion of the downlink control physical slot constituted by the control slot combining/separating unit 3 . the

In addition, in FIG. 5 , in the mobile device 8 , the wireless modem unit 11 demodulates radio waves received by the transmitting and receiving antenna 12 . At this time, the unique word pattern is detected by the unique word pattern detection unit 13, and if the unique word pattern included in the received signal is known, wireless synchronization with the base station 1 can be performed for communication. the

Here, the unique word pattern detection unit 13 included in the mobile device 8 has a function capable of recognizing the unique word pattern specified by the mobile radio communication system of this embodiment. For example, in the case of a simple portable telephone system (PHS), it is possible to recognize the unique word pattern of the physical time slice for control specified in RCR STD-28 shown in FIG. 3, in the control channel normally transmitted by base station 1 , use the standard pattern stored in the unique word pattern storage part 6 as the unique word. Therefore, the mobile device 8 can recognize the control channel transmitted from the base station 1 and can communicate with the base station 1 in synchronization. the

Now, consider a case where mobile devices 8 are concentrated in the service area 14b of the base station 1b as shown in FIG. 6, and radio resources of the base station 1b are congested. At this time, the traffic concentration detection unit 5 of the base station 1b which has detected the traffic concentration instructs the control channel transmission/reception control unit 2 to change the unique word pattern used. The control channel transmission/reception control unit 2 changes the unique word pattern specified to the control slot assembly/separation unit 3 to a non-standard pattern stored in the unique word pattern storage unit 6 . the

As described above, the unique word pattern detection unit 13 included in the mobile device 8 has the function of recognizing the unique word pattern specified by the mobile wireless communication system of this embodiment. On the other hand, if the unique word of the control channel that base station 1b sends is changed into non-standard pattern, then the unique word pattern detection part 13 of mobile machine 8 cannot recognize the control channel that base station 1 sends, therefore cannot obtain synchronization with base station 1, The prescribed communication cannot be carried out. the

According to the mobile wireless communication system constructed in this way, when it is necessary to limit the wireless access from the mobile device, the transmission control is performed by changing the unique word pattern of the control channel transmitted so far to a pattern other than the standard and transmitting. The control channel cannot be identified in the machine, and the use of radio resources of the base station can be stopped reliably. the

In addition, in this mobile radio communication system, it is not necessary to change the transmission frequency and transmission timing of the control channel to be transmitted when performing the above-mentioned restriction. Therefore, when the restriction is released, it is not necessary to reacquire the transmission frequency and transmission timing of the control channel, and the service can be quickly restored. the

As described above, in this embodiment, when restricting access from the mobile station to the base station based on the monitoring result of the traffic concentration detection unit, the unique word pattern set for the control physical time slot is changed to the one specified in the standard specification. Therefore, it is possible to reliably stop the use of radio resources of the base station and quickly restore the interrupted service. the

Example 2

Fig. 7 is a block diagram showing a transmission and reception functional structure of a mobile device in a mobile radio communication system according to Embodiment 2 of the present invention. The mobile device 8 shown in this figure is configured to further include a unique word pattern storage unit 16 capable of storing a plurality of predetermined unique word patterns. In addition, in other configurations, the configurations are the same as or equivalent to those of the mobile device 8 in the first embodiment, and these parts are denoted by the same symbols. the

In the mobile radio communication system of Embodiment 1 above, the restriction control is performed on all mobile units during the restriction control, but in the mobile radio communication system of this embodiment, for the mobile devices divided into a plurality of groups, Restriction control is performed for each of the plurality of groups. the

Fig. 8 is the figure that shows the configuration example of the unique word pattern stored in the unique word pattern storage part 16 of mobile machine 8 of embodiment 2, and Fig. 9 shows the unique word pattern storage part 6 stored in base station 1 of embodiment 2 A diagram of an example of the composition of the unique word pattern in . In addition, the configuration of the base station 1 of the second embodiment is the same as that of the first embodiment shown in FIG. 1 . In the example shown in FIG. 8 , only the standard pattern is stored in the mobile machine A, two types of the standard pattern and pattern 1 different from the standard are stored in the mobile machine B, and the standard pattern and the standard pattern are respectively stored in the mobile machine C. The mode is different and is also different from the mode 2 set in the mobile machine B. On the other hand, as shown in FIG. 9, in the base station 1, all of the unique word patterns used in at least one mobile machine shown in FIG. 8, that is, the standard pattern, pattern 1 and pattern 2, are stored. the

Next, the operation of the mobile wireless communication system of this embodiment will be described using FIG. 10 and FIG. 11 . 10 is a sequence diagram showing the operation of the mobile radio communication system according to the second embodiment, and FIG. 11 is a flowchart showing the operation of the mobile device in the mobile radio communication system according to the second embodiment. As shown in the upper part of Fig. 10, in the normal time (there is no limitation), the physical slot for downlink control of the standard pattern selected from the unique word pattern storage unit 6 is configured as the unique word pattern, and is sent to All mobile machines (mobile stations A, B, C) in the system transmit. In this case, since each mobile station can detect the unique word, it can transmit, for example, a link channel establishment request (LCH probability request) for transmission to the base station 1 (step S101). the

On the other hand, in the base station 1, when the concentration of traffic is detected, the traffic concentration detection unit 5 of the base station 1 instructs the control channel transmission and reception control unit 2 to change the unique word pattern used. For example, any one of a plurality of non-standard patterns is output from the unique word pattern storage section 6 to the control channel transmission/reception control section 2 . In addition, the change instruction to use the unique word mode output to the control channel transmission/reception control unit 2 may be issued every fixed time, or may be issued according to a predetermined pattern or timing. In addition, here, as shown in the middle part of FIG. 10 , it is assumed that mode 1 is set as the unique word mode to be used. the

At this time, in each mobile device, the following processing is performed according to the flow shown in FIG. 11 . Each mobile machine in the system checks the consistency between the received signal and the set unique word pattern (step S111). When the two patterns match (step S112, Yes), processing for establishing synchronization with the base station 1 is performed (step S113), the unique word pattern checking process ends, and predetermined communication is continued. the

On the other hand, under the inconsistent situation of the two patterns (step S112, No), it is checked whether other unique word patterns are preserved in the unique word pattern storage part 16 of the mobile machine (step S114). When there are other unique word patterns (step S115, Yes), change the unique word pattern (step S116), and check the consistency between the received signal and the unique word pattern again (step S111). On the other hand, when there is no other unique word pattern (step S115, No), it is judged that the synchronization with the base station 1 has failed (step S117), and the unique word pattern checking process ends. the

As a result of performing the above-mentioned processing in each of the mobile machines in the system, as shown in the middle part of FIG. 10, only the mobile machine B that has stored the same pattern 1 as the unique word pattern used by the base station 1 can detect the unique word. , only the mobile machine B can transmit a connection channel establishment request (LCH probability request) for signaling to the base station 1 (step S102). the

Next, consider a case where the unique word mode used is changed from mode 1 to mode 2 as shown in the lower part of FIG. 10 . At this time, base station 1 selects pattern 2 as the unique word, and uses it as the unique word pattern of the transmitted control channel. In each mobile machine in the system, carry out the unique word pattern checking process shown in Figure 11, as a result, only the mobile machine C that has preserved the same pattern 2 as the unique word pattern used by base station 1 can detect the unique word, Only the mobile machine C can transmit a connection channel establishment request (LCH probability request) for transmission to the base station 1 (step S103). the

According to the wireless communication system of mobile body constituted in this way, under the situation that the unique word pattern that detects from the received signal coincides with the unique word pattern stored in the unique word pattern storage unit, between the base station and the mobile machine, synchronous communication is carried out, Therefore, it is possible to reliably implement restriction control in which the mobile devices in the system are divided into a plurality of restriction groups. the

As mentioned above, in this embodiment, the mobile machine has the function of selecting the unique word pattern used by the base station from a plurality of unique word patterns stored in the mobile machine, so it is possible to reliably divide the mobile machines in the system into Restriction control of multiple restriction groups. the

Example 3

In the above-mentioned embodiments 1 and 2, there is no special regulation for the bit structure of the non-standard unique word pattern. On the other hand, this embodiment shows a structure suitable for a bit pattern which is a non-standard pattern. In addition, an example in which the system configuration that is the premise of this example is selected is shown. the

Fig. 12 is a signal space diagram showing the arrangement of symbols on the phase plane of the π/4 shift QPSK modulation system used in the simple portable telephone system (PHS), and Fig. 13 is a differential encoding rule showing the π/4 shift QPSK diagram. the

In the signal space diagram, since the distance from the origin to the symbol corresponds to the amplitude of the modulated signal, when the movement between symbols passes near the origin, the amplitude fluctuation of the modulated signal becomes large. If the amplitude fluctuation range becomes large, an amplifier capable of handling high power and amplification with a complicated circuit configuration are required from the viewpoint of maintaining the linearity of the transmission-side amplifier. the

Fig. 14 is a diagram showing symbol transition in the π/4-shift QPSK modulation system. In this figure, for example, when the symbol point is at point A, when the bit string "00" is active, as shown in Fig. 13, the phase difference between symbols is "π/4", and the symbol at point A Transfer to point B. Similarly, when the bit strings "01", "11", and "10" work respectively, the phase differences between the symbols are "3π/4", "-3π/4", and "-π/4" , the symbols at point A are transferred to points C, D, and E respectively. the

As can be seen from the transition diagram shown in FIG. 14, in the phase shift of the π/4 shift QPSK modulation method, the transition of π/4 (point A → point B) and the transition of -π/4 (point A → point E point) compared with the transition of 3π/4 (point A → point C) and the transition of -3π/4 (point A → point D), the change in distance from the origin becomes smaller. Therefore, in a simple portable telephone system (PHS) or the like, by setting the unique word pattern to a bit string combining "00" and "10", for example, "0010 0010 0010 0010 0010 0010 0010 0010", transmission can be reduced. The amplitude variation range when a unique word is used. the

As described above, according to the unique word pattern shown in this embodiment, a bit pattern with a smaller amplitude fluctuation range is selected when the unique word pattern used for transmission is selected, so that the power consumption of the base station can be reduced. the

As described above, the present invention is useful as a restriction control technique for wireless lines used in a mobile wireless communication system, and is particularly suitable for suspending a mobile device that operates incorrectly such as ignoring a restriction signal for restricting wireless access. Conditions of use, etc. the

Claims (7)

1. A base station is to establish synchronously according to the unique word pattern and the base station of forming the mobile body wireless communication system with the wireless lines between a plurality of mobile machines, it is characterized in that comprising: a control channel transmission and reception control unit that controls the transmission and reception of the control channel; According to the control from the above-mentioned control channel transmission and reception control unit, the time slice combination/separation unit for control that performs the combination/separation of the physical time slice for control; Monitoring the traffic state of the above-mentioned wireless line, and detecting whether the traffic is concentrated or not; A unique word pattern storage unit storing the unique word pattern specified when the above-mentioned control channel transmission/reception control unit requests combination of control physical time slots from the control time slot combination/separation unit, wherein When the control slot combination/separation means restricts access to the base station from the mobile station based on the monitoring result of the traffic concentration detection means, the unique word pattern set in the control physical slot is changed to Modes other than those specified in the standard specifications. 2. The base station according to claim 1, characterized in that: A plurality of unique word patterns are stored in the above-mentioned unique word pattern storage part, The unique word pattern selected from the plurality of unique word patterns is set in the physical time slice for control. 3. The base station according to claim 1, characterized in that: A unique word pattern included in a modulated signal transmitted from the base station when restricting access from the mobile device to the base station is set such that an amplitude fluctuation amount of the modulated signal is reduced. 4. The base station according to claim 3, characterized in that: The modulation signal described above is a π/4-shifted QPSK signal, and either π/4 or -π/4 is selected as the inter-symbol phase difference of the π/4-shifted QPSK signal. 5. A kind of mobile machine, is to establish the mobile machine of forming mobile radio communication system with the radio line between base station synchronously according to unique word pattern, it is characterized in that comprising: a control channel transmission and reception control unit that controls the transmission and reception of the control channel; According to the control from the above-mentioned control channel transmission and reception control unit, the time slice combination/separation unit for control that performs the combination/separation of the physical time slice for control; A unique word pattern storage unit storing a plurality of unique word patterns; According to the comparison comparison result of the unique word pattern detected from the received signal and the unique word pattern stored in the above-mentioned unique word pattern storage unit, obtain the unique word pattern detection part with the wireless synchronization of the above-mentioned base station, wherein The unique word pattern detection means performs synchronous communication with the base station when the unique word pattern detected from the received signal matches the unique word pattern stored in the unique word pattern storage means. 6. A limit control method of a mobile wireless communication system, which limits the use of wireless lines between a base station and a plurality of mobile machines, and is characterized in that it comprises: When the radio resources of the base station are congested and access to the base station from the mobile device is limited, the pattern of the unique word included in the control channel transmitted by the base station is changed to a pattern other than that specified in the standard specification. The unique word mode change steps of the mode. 7. The restriction control method of the mobile wireless communication system according to claim 6, characterized in that: In the unique word pattern changing step, any one of a plurality of unique word patterns other than the pattern specified in the standard specification is selected based on the monitoring result of the traffic state of the wireless channel.

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